READ AND SAVE THESE INSTRUCTIONS

VAPOR-LOGIC ®
VERSION 6
Humidifier Control System

Installation and
Operation Manual
Table of contents
DriSteem® Technical Support WARNINGS AND CAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
800-328-4447
OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Vapor-logic capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Humidification system overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Vapor-logic board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Keypad/display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Web interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Pre-installation Checklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Installation process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Step 1 – Field wiring: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Control input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Control input signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Limit controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Vapor-logic keypad/display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Communication connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Field wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Sensor placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Step 2 – Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Using the keypad/display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Using the Web interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Setup screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Step 3 – Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Using menus and screens. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Home screen (keypad/display). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Changing mode and set point. . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Tank activities defined . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Status screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Diagnostics screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Alarms screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Status LED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
PID tuning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Improves humidifier response time. . . . . . . . . . . . . . . . . . . . . . . . . 55
The proportional term. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
The integral term. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
The derivative term . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
PID band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
PID setup tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Water level control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Probe system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Float valve system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Electrode steam humidifiers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

ii VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

Table of contents
Options and features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Duct high limit switch option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Modulating high limit transmitter option. . . . . . . . . . . . . . . . . . . . . 62
Temperature compensation control option. . . . . . . . . . . . . . . . . . . . 62
Auxiliary temperature sensor option. . . . . . . . . . . . . . . . . . . . . . . . 63
Tank preheat feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Aquastat set point feature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Freeze protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Fan-based dispersion operation. . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Sensor offsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Automatic drain sequence, tap/softened water. . . . . . . . . . . . . . . . 65
Draining when using softened water . . . . . . . . . . . . . . . . . . . . . . . 66
Skim timer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
End-of-season drain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Service interval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Setting date and time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Battery backup, nonvolatile memory . . . . . . . . . . . . . . . . . . . . . . . 67
Security/password. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Downloading historical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Backing up and restoring Settings. . . . . . . . . . . . . . . . . . . . . . . . . 68
Firmware updates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Backing up and restoring settings . . . . . . . . . . . . . . . . . . . . . . . . . 69
Downloading firmware updates. . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Installing firmware updates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Test outputs and test run. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Modbus, BACnet, LonTalk interoperability . . . . . . . . . . . . . . . . . . . . . . 74
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Installing LonTalk as a retrofit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Installing BACnet as a retrofit. . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Multiple-tank operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Multi-tank mode defined. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Multi-tank control interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Start-up order and trim tanks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Tank grouping to maximize efficiency . . . . . . . . . . . . . . . . . . . . . . 85
Redundant tank for mission-critical applications. . . . . . . . . . . . . . . . 85
Tank wear leveling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Fault tolerance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Wiring a multi-tank group of humidifiers. . . . . . . . . . . . . . . . . . . . . 87
Multi-tank system setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Changing a priority group. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Other system parameters and interoperability. . . . . . . . . . . . . . . . . 88
Multi-tank operation with Web interface. . . . . . . . . . . . . . . . . . . . . 88
Using the keypad/display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Troubleshooting guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Replacement parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL iii

 Warnings and cautions
WARNINGS AND CAUTIONS

WARNING CAUTION
Indicates a hazardous situation that could result in death or Indicates a hazardous situation that could result in damage to or
serious injury if instructions are not followed. destruction of property if instructions are not followed.
mc_051508_1145

WARNING
Read all warnings and instructions
This page provides important safety instructions; it is intended to supplement — not replace — the humidifier's Installation,
Operation, and Maintenance Manual (IOM). Read the IOM that was provided with the humidifier before performing
service or maintenance procedures on any part of the system. Failure to follow all warnings and instructions could
produce the hazardous situations described here and in the IOM, resulting in property damage, personal injury, or
death.
If the IOM is missing, go to www.dristeem.com to download a replacement.
Hot surfaces and hot water
Steam humidification systems have extremely hot surfaces, and water in tanks, electrode cylinders, steam pipes, and
dispersion assemblies can be as hot as 212 °F (100 °C). To avoid severe burns, allow the entire humidification system to
cool.
Follow the cool-down procedure in the humidifier's IOM before performing service or maintenance procedures on any
part of the system.
Shut down the energy source
Before performing service or maintenance procedures on any part of the humidification system, verify that all energy
sources are off. Energy sources can be electricity, gas, steam, or hot liquid. Failure to shut down the energy source could
result in carbon monoxide poisoning, fire, explosion, electrical shock, and other hazardous conditions. These hazardous
conditions could cause property damage, personal injury, or death.
Contact with energized circuits can cause property damage, severe personal injury or death as a result of electrical
shock or fire. Do not remove the shroud/cover, electrical panel cover/door, access panels, or heater terminal cover until
electrical power is disconnected.
Follow the shutdown procedure in the humidifier's IOM before performing service or maintenance procedures on any
part of the system.

CAUTION
Hot discharge water
Discharge water can be as hot as 212 °F (100 °C) and can damage the drain plumbing.
Humidifiers equipped with a water tempering device need fresh make-up water in order to function properly. Make sure the water
supply to the water tempering device remains open during draining.
Excessive supply water pressure
Supply water pressure greater than 80 psi (550 kPa) can cause the humidifier to overflow.

iv VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OVERVIEW

Vapor-logic capabilities
ACCURATE, RESPONSIVE CONTROL
The Vapor-logic controller provides accurate, responsive RH control. PID control
tunes the system for maximum performance.

Modbus®, BACnet®, or LonTalk® allow interoperability with multiple building

automation systems. Modbus is standard, and BACnet or LonTalk are available
options.

Web interface, provides the capability to set up, view, and adjust humidifier
functions via Ethernet, either directly or remotely through a network.

Contactor wear leveling (Vaporstream®) distributes cycles among multiple

contactors for equal wear and longer contactor life.

Cycle counter (electric humidifiers) triggers a message when it’s time to replace
contactors.

USB port allows easy firmware updates, and data backup and restore
capability.

Real-time clock allows time-stamped alarm and message tracking, and

accurate drain and flush scheduling.

Auxiliary temperature sensor/transmitter allows temperature compensation

control to prevent window condensation, or air temperature monitoring, such
as in a duct (not available for XT humidifier).

Programmable outputs allow remote signaling and device activation.

Multiple-humidifier control allows staged control of up to 16 humidifiers with

one controller.

Note: XT and Low-maintenance humidifiers do not operate in multi-tank mode;

however, up to four XT humidifiers can be staged to operate in sequence.

Controller data, such as RH, air temperature, water use, energy use, alarms,
and messages, can be downloaded to a PC for viewing and analysis. RH,
alarms, and messages can also be viewed on the keypad/display and Web
interface.

More capabilities on the next page >

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 1

OVERVIEW

Vapor-logic capabilities
Enhanced diagnostics include:
Insert a USB flash drive
• Test outputs function using keypad/display or Web interface to verify into the Vapor-logic
component operation board’s USB port to
perform software
• Test humidifier function using simulated demand to validate performance updates, download
data logs, and back
up and restore data.

Use the
Vapor‑logic
keypad/display
or the standard Web interface, shown here, to
control your humidification system.

2 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OVERVIEW

Humidification system overview

FIGURE 3-1: TYPICAL HUMIDIFICATION SYSTEM LAYOUT (GTS HUMIDIFIER SHOWN)

Dispersion assembly

Humidifier

Connect a computer directly to the

OM-1220 Vapor-logic board, or through a
network, to use the Web interface
Vapor-logic
keypad/display

Every humidification system with a Vapor-logic controller has a keypad/display connection and an
Ethernet connection for connecting to a Web interface on a computer. A GTS humidifier is shown
here, with keypad/display mounted on the cabinet. Other types of DriSteem humidifiers can have
the keypad/display contained within a control cabinet or mounted remotely.

OPERATING CONDITIONS
The Vapor-logic main board and keypad/display must be operated and stored
within the limits listed below. Exceeding these limits can result in poor display
performance and/or damage to the unit.

Main board
Operating temperature: 32 °F to 158 °F (0 °C to 70 °C)
Storage temperature: -40 °F to 185 °F (-40 °C to 85 °C)
Operating humidity range: <95% noncondensing

Keypad/display
Operating temperature: 32 °F to 158 °F (0 °C to 70 °C)
Storage temperature: -22 °F to 176 °F (-30 °C to 80 °C)
Operating humidity range: <95% noncondensing

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 3

OVERVIEW

Vapor-logic board : Components

FIGURE 4-1: VAPOR-LOGIC CONTROL BOARD

Factory connection points for drain, steam valve, etc.

Power connection

Ethernet connection for computer network and/or BACnet/IP

Keypad/display connection

Field connection points for transmitters,

Factory connection points power vent, etc.
for water level control,
gas valves, etc.

Field connection terminal labels

(white border)

Multi-tank connection

BACnet or Modbus connection

Connection pins for optional LonTalk module

The photo above shows key components of the Vapor-logic control board. See the illustration on the next page for more detail.

FIGURE 4-2: CONTROL BOARD MOUNTED ON GTS SUBPANEL

Vapor-logic control board

The Vapor-logic control board is
mounted inside the humidifier control
compartment or cabinet.

Notes:
• Control board is shown here mounted
on a GTS humidifier subpanel.
Location varies with humidifier type.
• Control board for electric humidifiers
is in the control cabinet or on the
humidifier’s subpanel.

4 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OVERVIEW

Vapor-logic board: Connections

FIGURE 5-1: VAPOR-LOGIC CONTROL BOARD CONNECTIONS
P19:
Steam = S
 team or hot water valve/XT staging/
HPS VFD
D4 , 21 VDC indicator = Ground for blower or steam valve

STEAM
P1: SSR/BL = S SR (electric systems)/or blower

24VAC
24vac = Power to board (gas systems)
= Ground for power return P1 P18: (all are 24VAC outputs)
P19 CT4 = Contactor 4 (electric systems)/or

SSR / BL
+ —
P2:
Ignition module 4 (gas systems)/XT dual
TOP MID LOW
Low = Low water probe
Mid = Mid water probe contactor 2/Z3 drain
Top = Top water probe CT3 = C ontactor 3/Ignition module 3/XT dual

FILL DRAIN CT1 CT2 CT3 CT4

= Ground for water probe P2 drain 2/HPS pump 2/Z3 supply
CT2 = C ontactor 2/Ignition module 2/XT dual
P18 fill 2/HPS pump 1/Z2 drain

P3: P17: (all are 24VAC outputs)

FPsw LW BT1 GV1

GV1 = Gas valve 1 (24vac input)/HPS CT1 = C  ontactor 1/Ignition module 1/HPS
VFD fault single zone/Z2 supply
BT1 = Blower tach 1 (pulse tach input) P3 Water probe LEDs Drain = D  rain valve/HPS depressurization/Z1
LW = Low water (24vac input)/XT high P17 drain
water probe/Thermal trip input Fill = Fill valve/HPS flush valve/Z1 supply
FPsw = Flue pressure switch

NO-2 SDU PV/CA

(24vac input)/XT2 high P16: (all are 24VAC outputs)
water probe (right cylinder)
lsw

PV/CA = Power vent/combustion air

P16 c ontrol signal/Thermal trip power/
CPU LED
TT

P4: HPS RO enable

Isw = Interlock switch (24vac input) P4 SDU = S pace Distribution Unit/Area type/ HPS
Status LED VFD enable
TT = Tank temp sensor (RTD input)
CS1

= Ground for tank temp sensor

21VDC DHL 24Vac AFsw 21VDC TS 24Vac CAsw 24Vac PVsw

CS1 = A nalog input XT current J404 NO-2 = N  ormally open #2.
sense (4-20 mA)/HPS inlet Power vent switch jumper * See Caution below.
pressure/ Flue temp sensor P15:
CS2 21VDC BT4 GV4 BT3 GV3 BT2 GV2

J1101 P15 PVsw = Power

 vent switch (24vac input)/STS
USB port XV float/STS external demand
J403 24vac = Power to power-vent switch
P5: P5 CAsw = Combust. air sw. (24vac input)
Combust air switch jumper 24vac = Power to combustion air switch
GV2 = Gas valve 2 (24vac input)
BT2 = B
 lower tach 2 (pulse tach P14
input) P14:
P9 TS = A
 ux. temp. sensor or temp. comp.
GV3 = Gas valve 3 (24vac input) Ethernet connection to laptop
BT3 = B
 lower tach 3 (pulse tach sensor (4-20 mA input)/XT current sense
input) computer, network, or BACnet IP input dual cylinder/HPS RO pressure
P6 P13
24vdc = Power to aux. temp. sensor or
P6: temp. comp. sensor
GV4 = Gas valve 4 (24vac input) P13:
BT4 = B
 lower tach 4 (pulse tach AFsw = Airflow proving switch (24vac input)
input) J1001 24vac = Power to airflow proving switch
NO-1 C-1 C-2

21vdc = 21vdc RS485 termination for multi-tank DHL = Duct high limit switch/transm.
CS2 = Analog input (4-20 mA)/ (4-20 mA input)
HPS pump pressure/Drain Vapor-logic keypad/display connection P12 21vdc = Power to duct high limit switch
temp sensor or transmitter
P12:
Programmable relay #1
21VDC RH

P11 * See Caution below.

C-2 = Common #2
C-1 = Common #1
NO-1 = Normally open #1
P7 P8 P20 P11:
+ — + — = Ground for demand signal by others
FIELDBUS MULTI-TANK MASTER ENB RH = Space RH input (RH transmitter, dew point
(RS485) (Main transmitter, humidistat, or demand signal
enable/disable) by others (4-20 mA or 0-16vdc typical)
Connection pins for optional LonTalk module 21vdc = Power to space RH sensor
FIELDBUS = Modbus
or BACnet MS/TP (RS485) J402 Main enable jumper

Notes:
• Programmable relay functions are defined using the keypad/display or CAUTION
Web interface during the Setup process.
• For most applications, field connections are made at terminals on the
Programmable relay maximum electrical ratings
board that are surrounded with a white border (P7, P8, P11-P16, P20). Programmable relays are rated for 125 VAC, 3 Amp or
• This control board is used for several types of humidifier systems (for 30 VDC, 3 Amp maximum. Exceeding these maximum
example, gas humidifiers as well as electric humidifiers). Your application ratings can cause the relay components on the
will not have connections at all terminals. Vapor-logic board to fail.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 5

OVERVIEW

Keypad/display
FIGURE 6-1: USING THE VAPOR-LOGIC KEYPAD/DISPLAY

Typical Home screen Change set point from the Home screen
by pressing the Up or Down arrow keys
until set point is highlighted (as shown
here), press Enter, press Up or Down
arrow keys to change value, press Enter
to confirm

Tank temperature
Change Mode from
Fill icon shows water level in tank
the Home screen by
(see Page "Fill icon" on page 39)
pressing the Up or Down
Note: XT humidifier display does not
arrow keys until Mode is
include fill icon (see Page 61).
highlighted, press Enter,
press Up or Down arrow
keys to change, press
Enter to confirm Tank status

Alarm label flashes when

there is a system alarm
Press Main softkey for
Main menu; other softkey
functions vary by screen

Message label becomes highlighted

when there is a system message
Press Up or Down
arrow to move through
menus and screens

Press Enter to select or confirm

6 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OVERVIEW

Web interface
FIGURE 7-1: USING THE VAPOR-LOGIC WEB INTERFACE (SETUP SCREEN SHOWN)

Click on a tab label to move to another screen

Click on
CHANGE to
change value

Click here
to view
alarms To change value:
Highlight value;
Click here to type in new value;
view messages click on APPLY

Click on label
to contract (–)
or expand (+)
menu item

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 7

INSTALLATION

Pre-installation Checklist
☐ See Figure 8-1 for field terminal block locations. Note FIGURE 8-1: VAPOR-LOGIC CONTROL BOARD DETAIL
that field wiring connection locations on the Vapor-logic Board detail showing white border
board are surrounded with a white border.
☐ See the figure on the next page for instructions on how
to make wiring connections.
☐ See the wiring drawings and manuals that shipped
with your humidifier.
☐ When making field connections, do not route low
voltage wires near line voltage wires. Do not route low
voltage wires in the same conduit as line voltage wires.
☐ Humidistat, room/duct transmitter, temperature sensor, Field connection terminals.
and airflow proving switch wiring must be minimum Terminals P-11 through P-16
18-gauge (1 mm2) plenum rated, shielded (screened), have a white border on the
twisted pair wire with a bare drain wire for grounding. Vapor-logic board. This is
where you will make most of
☐ Connect the shield (screen) wire [with a length less than your field wiring connections.
2" (50 mm)] to the shield (screen) ground terminal on
the electric subpanel. Do not ground the shield (screen)
wire on the humidistat or transmitter end.
☐ If you have a remote-mounted control cabinet, the
water level control device, thermal trip, safety interlock,
fill valve, and drain valve wiring must be minimum Field connection terminals.
18-gauge (1 mm2) stranded wire run in a conduit
separate from power wires.
Do not use shielded (screened) cable for water level
control devices.
When the control cabinet is mounted remotely from the
humidifier, connect a ground wire from the machine
ground lug on the humidifier to the machine ground lug
in the control cabinet. The bonding machine ground
wire should be the same AWG (mm2) as the largest
heater wire (electric humidifiers) or sized per local
code, National Electrical Code (NEC), or in Europe,
IEC 60364 requirements.

8 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 INSTALLATION

Pre-installation Checklist
FIGURE 9-1: VAPOR-LOGIC
SW1 DSTEEM Fieldbus AI1
TERMINAL
BT4 GV4
BLOCK DETAIL AND
BT3 GV3 BT2 GV2 AI2
CONNECTION INSTRUCTIONS
TT lsw FPsw LW BT1 GV1 Top Mid Low 24VAC

Tighten screw after P5 P1

wire is inserted.
P8 P7 P6 P4 P2

P3
Maximum torque is Terminal block plug.
3 in-lb (0.34 N-m) Make connections
when the plug is
Remove insulation attached to the
from end of wire board, or remove for
Ethernet

and insert wire easier access. Pull

here. plug straight up to
P9 remove.
Display

P10

P20
Optional LonTalk® card location
USB
Vapor-logic board detail
(see also Figure 5-1)

P17

P18
P12 P13 P14 P15
P16

P11 P19
21VDC RH NO-1 C-1 C-2 21VDC DHL 24VAC AFsw 24VDC TS 24VAC CAsw 24VAC PVsw NO-2 SDU PV/CA Fill Drain CT/I1 CT/I2 CT/I3 CT/I4 SSR/BL Steam

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 9

 INSTALLATION

Installation process
The Vapor-logic board is designed to make installation very easy:

• Terminal blocks that require field connections are outlined in white.

• Terminal plugs can be removed to allow easy access when inserting wires
and tightening screws.
• For most applications, humidifiers ship with the control board fully
configured, with drain, fill, and other humidifier components factory-wired
to the board, and the keypad/display attached to the humidifier and
connected to the Vapor-logic board.

INSTALLING VAPOR-LOGIC IS A THREE-STEP PROCESS:

1. Connect field wiring from device to Vapor-logic board.
See instructions beginning on Page 12. Note that some connections
listed here may not apply to your system.
• Control input (one required)
– RH or dew point transmitter
– Demand signal by others (4-20 mA or 0-10 VDC typical)
– Room or duct humidistat
– Demand signal by BACnet, Modbus, or LonTalk
• Limit controls
– Airflow switch (duct or SDU)
– Duct high limit on-off switch or transmitter
– Temperature compensation transmitter (or auxiliary temperature sensor
connected to same terminal)
– Main enable

10 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 INSTALLATION

Installation process
• Communication connections
– Vapor-logic keypad
– Ethernet
– Modbus
– BACnet
– LonTalk
– Multiple-tank communication
• Programmable triac and relay
• Area-type, SDU dispersion fans, or steam blowers
• Combustion air switch and power vent (GTS systems only)
2. Complete the Setup process.
See instructions beginning on Page 28.

3. Start up humidifier(s).
See instructions on Page 37.

Refer to the Pre-installation Checklist and drawings on the previous pages, and
then make the field wiring connections as described on the following pages.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 11

 INSTALLATION

Step 1 – Field wiring: Control input

Connect control input signal wiring by inserting wires into Terminal P11 FIGURE 12-1: TERMINAL P11
(labeled 21vdc, RH, and ground) per the wiring diagram on the next page.
Tighten screws.

Allowed inputs at Terminal P11 include:

• RH transmitter or dew point transmitter

Transmitters provide a signal proportional to the RH or dew point being
measured. All transmitters provided by DriSteem are two‑wire devices using
a 4 to 20 mA signal.
• Demand signal by others
Demand signals are sent to the Vapor-logic board from another control
system such as a building automation system. These systems have their own
Terminal P11
RH or dew point transmitters, calculate required humidifier output, and send
a demand signal to the humidifier to create steam at a percentage of that
humidifier’s capacity. Demand signals are typically 0-10 VDC or 4-20 mA,
but may also come from a DDC signal via Modbus, BACnet, or LonTalk.
A humidistat also delivers a demand signal to the humidifier, but it is not
typically used with Vapor-logic. Terminal P11:
21vdc = Power to space RH sensor
Humidistats provide either on-off control or modulating control. DriSteem RH = Space RH input (RH transmitter, dew point
humidistats are powered by a 24 VDC supply provided by the Vapor‑logic transmitter, humidistat, or demand signal
control board. by others (4-20 mA or 0-10) VDC input
= Ground for demand signal by others
When using modulating control, the signal from a humidistat directly
controls the amount of output from the humidifier.

Note:
Notes: If you do not know which control components
were ordered with your system, contact
• See Figure 13-1. DriSteem or connect your keypad/display to
the Vapor-logic board per the instructions on
• For more information about control input signal types and operation, see Page 19. Go to the Setup menu per the
"On-off control" on page 14. instructions on Page 28 to view system
parameters that were factory configured as
• See "Modbus, BACnet, LonTalk interoperability" on page 74 for more ordered.
information about input signals.

12 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 INSTALLATION

Step 1 – Field wiring: Control input

FIGURE 13-1: VAPOR-LOGIC CONTROL INPUT WIRING CONNECTIONS

Signal by others

0-10 VDC 4-20 mA

Vapor-logic Vapor-logic

Input resistance
21VDC 500 ohms 21VDC
RH RH

Control panel 2-wire #18GA Control panel 2-wire #18GA

shield GND lug Shield cable shield GND lug Shield cable

Transmitter

Vapor-logic Vapor-logic

Dew point P11 P11

21VDC RH 21VDC
21VDC
RH Y RH
RH 4-20 mA humidity
Room sensor
or duct COM

2-wire #18GA
Control panel 2-wire #18GA Shield cable
shield GND lug Shield cable
Control panel
shield GND lug
Note:
Input resistance on 4-20 mA is 500 ohms Note: Input resistance 500 ohms

On-off RH humidistat
Room/Duct humidistat

P11
21VDC
NC RH
% H20 C
GN
Room or duct
NC contact 2-wire #18GA Shield cable (TYP)
opens above set
Control panel shield GND lug
point

Key
Control circuit wiring Optional field

Field wiring
Break to external
Optional factory connections diagram

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 13

 INSTALLATION

Step 1 – Field wiring: Control input signals

DriSteem offers three control options for all its humidification systems controlled
by Vapor‑logic: On-off control, demand signal control, and transmitter control.

ON-OFF CONTROL
On-off control—the simplest control scheme—does exactly what its name
implies: the output device turns fully on, then fully off.

The humidistat that controls the humidifier has a differential between the on
and off switch points. The differential is established at a range sufficient to
prevent output short cycling. In other words, the humidity level has to fall below
set point before the humidistat closes and energizes the humidifier. Once the
humidifier is energized, the humidistat stays closed until the humidity is above
set point. This creates an operating range that prevents the humidifier from
running for very short periods of time.

In applications where there are multiple contactor outputs, such as an electric

element humidifier, contactors for each heat stage are pulled in one at a time
with a one‑second delay between them. In applications with a variable output
stage, such as a GTS humidifier, the outputs are ramped up until they reach
100%.

14 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 INSTALLATION

Step 1 – Field wiring: Control input signals

MODULATING DEMAND SIGNAL CONTROL Calculation of transmitter % RH
With modulating demand signal control, a modulating humidistat
or a building automation system sends a signal to the Vapor-logic (mA reading) – 4 mA
% RH = x 100%
controller, which then sends a signal to the humidifier to produce 16 mA
a directly proportional steam output. For example, if a humidistat
operating between 4 mA and 20 mA sends a 4 mA signal,
Example: 12 mA – 4 mA
the humidifier produces no output; a 12 mA signal causes the x 100% = 50% RH
humidifier to run at 50% of capacity; and a 20 mA signal causes 16 mA
the humidifier to run at 100% capacity.

With a humidistat provided by DriSteem producing this signal,

the humidity set point is set at the humidistat. The keypad/display
then is used for maintaining and troubleshooting the humidification
system, with humidifier control stemming from the humidistat itself.
With a building automation system (BAS) providing the signal, the
humidity set point is established by the BAS, and the humidifier
responds to the BAS commands.

TRANSMITTER CONTROL
With transmitter control, the Vapor‑logic board receives a signal
that corresponds to the actual humidity level measured in the space
being controlled. (With a transmitter provided by DriSteem, the
signal is 4 to 20 mA, which corresponds to 0 to 100% RH). The
Vapor‑logic controller employs an internal PID loop that uses this
humidity measurement along with a user-defined humidity set point
to calculate a demand level. This demand level is the level at which
the humidifier will run. See “PID tuning” on Page 55.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 15

 INSTALLATION

Step 1 – Field wiring: Limit controls

AIRFLOW PROVING SWITCH FIGURE 16-1: TERMINAL P13
Connect wiring for a duct, Space Distribution Unit (SDU) airflow proving switch
by inserting wires into the terminal block plug at P13 (labeled AFsw and

Terminal P13
24vac) per the wiring diagram on the next page. Tighten screws; maximum
torque is 3 in-lb (0.34 N-m). (An SDU is a cabinet fan dispersion assembly.)

See also “Sensor placement” on Page 26.

DUCT HIGH LIMIT SWITCH OR TRANSMITTER

Connect wiring for a duct high limit switch or transmitter by inserting wires
into the terminal block plug at P13 (labeled DHL and 21vdc) per the wiring
diagram on the next page. Tighten screws.

Note: The duct high limit sensor connected at this location can be an on-off
high limit switch, or it can be a duct high limit transmitter with an adjustable J402
high limit set point (4-20 mA input). Terminal
P20
See also “Sensor placement” on Page 26.
Terminal P13:
21vdc = Power to duct high limit switch or
MAIN ENABLE INPUT
transmitter
Connect wiring for an enable/disable dry-contact signal by inserting wires into DHL = Duct high limit switch/transm. (4-20 mA
the terminal block plug at P20 (labeled MAIN ENB). Tighten screws. Remove input)
24vac = Power to airflow proving switch
shunt on J402 if wiring is installed. AFsw = Airflow proving switch (24 VAC input)

If an enable signal is not being used, jumper the MAIN ENB terminal block
plug at P20 or attach the included shunt to the two pin header at J402.

16 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 INSTALLATION

Step 1 – Field wiring: Limit controls

FIGURE 17-1: VAPOR-LOGIC LIMIT CONTROLS WIRING CONNECTIONS Note:
An airflow switch must be used in any duct
humidification application. If no airflow switch
Airflow switch in a duct When using an SDU is used, install shunt at P13 (24VAC to AFSW).
Vapor-logic

Vapor-logic P13
24VAC
P13
24VAC 24VAC
Duct air flow
NO Com switch (N.O.)
Duct air flow Duct air flow switch is not
switch is in used on Area-type
SDU cabinet
Note:
Field wiring required between SDU cabinet terminal
strip for SDU blower and air flow switch

Duct high limit (not used on SDU or Area-type)

On/off Transmitter

Vapor-logic Vapor-logic
Modulating high limit
P13 P13
21VDC 21VDC
21 VDC
NC DHL V DHL 4-20 mA
C RH High limit sensor
GN
Duct mount
NC contact 2-wire #18GA 2-wire #18GA
opens above shield cable (TYP) shield cable (TYP)
set point Control panel Control panel
shield GND lug shield GND lug

Temperature compensation transmitter or auxiliary temperature sensor

Note: This control is not available for XT humidifiers

Temp comp transmitter

Vapor-logic

P14
21VDC
RD TS
WH

Control panel 2-wire #18GA

shield cable (TYP)

Key
Control circuit wiring Optional field

Field wiring
Break to external
Optional factory connections diagram

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 17

 INSTALLATION

Step 1 – Field wiring: Limit controls

Connect wiring for a temperature compensation transmitter or an auxiliary FIGURE 18-1: TERMINAL P14
temperature sensor by inserting wires into the terminal block plug at P14
(labeled 21vdc and TS) per the wiring diagram on the previous page. Tighten
screws; maximum torque is 3 in-lb (0.34 N-m). Terminal P14

Note: Only one device can be connected at P14. You will identify the
connected device in “Step 2 – Setup,” beginning on Page 28.

AUXILIARY TEMPERATURE SENSOR

An auxiliary temperature sensor typically monitors duct or space air
temperature. Mount the auxiliary temperature sensor wherever you want to
monitor temperature. Auxiliary temperature readings are logged to the data
log.

TEMPERATURE COMPENSATION TRANSMITTER

A temperature compensation transmitter allows Vapor-logic to reduce humidifier
output on cold days, reducing window condensation. Mount the temperature
compensation transmitter on the inside of an outside-wall window. Terminal P14:
21vdc = Power to auxiliary temperature sensor
To mount the temperature compensation sensor: or temperature compensation sensor
(transmitter)
1. See Figure 18-2. Position the temperature compensation sensor control box TS = Auxiliary temperature sensor or
temperature compensation sensor
on a wall adjacent to a window frame facing north or northeast. (transmitter) (4-20 mA input)
2. Place the flat surface of the temperature sensor tip on the lower corner of
glass surface.
FIGURE 18-2:
3. Temporarily hold the sensor tip in place with strips of masking tape.
TEMPERATURE COMPENSATION
4. Apply a small amount of clear RTV silicone adhesive over and around the TRANSMITTER INSTALLATION
sensor tip (making sure the sensor tip is in contact with the window glass).
Window frame
5. After adhesive cures, remove masking tape.
Thermostat
6. See the operation section of this manual for more information about the control wires Double-
pane
temperature compensation sensor.
window
Surface-
glass
mounted
thermostat OM-337

temperature Typical Secure temperature

control box sensor sensor tip to inside
on wall cord surface of window
routing glass using clear RTV
silicone adhesive

18 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 INSTALLATION

Step 1 – Field wiring: Communication connections

VAPOR-LOGIC KEYPAD/DISPLAY FIGURE 19-1: TERMINAL P10
If your keypad/display is factory-mounted and connected to the Vapor-logic
board, proceed to installing the next device required by your system.

If your keypad/display was shipped loose, mount the keypad/display in a

location so that the provided cable is long enough to connect the keypad/
display to the Vapor-logic board.

To connect a Vapor-logic keypad/display to the Vapor-logic board, insert the

male end of the provided cable into the Vapor-logic board at Terminal P10
(labeled Display) until you hear a click sound (see also the wiring diagram on
the next page). Plug the other end of the cable into the keypad/display. This
connection provides DC power and communication to the keypad/display.
Terminal P10:
See Caution at right before routing cable. Display

If a longer keypad/display cable is needed, order a replacement cable from

DriSteem (see the replacement parts section of this manual), or use a four-
conductor straight-through cable or a six-conductor, crossover, twisted pair CAUTION
cable connected to an RJ11 jack. Keypad/display cable
Maximum cable length is 500’ (152 m).
Note required operating conditions listed on Page 3.
When routing keypad/display cable,
route cable away from all power
Other than factory-mounted, there are three ways to mount the keypad/
wiring.
display. See Figure 19-2.

FIGURE 19-2: MOUNTING THE KEYPAD/DISPLAY

Mount keypad/display back Mount keypad/display back to

directly to wall junction box

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 19

 INSTALLATION

Step 1 – Field wiring: Communication connections

FIGURE 20-1: VAPOR-LOGIC COMMUNICATION WIRING CONNECTIONS

PC or BACnet IP
Ethernet connection

J1001: Install jumper if multi-tank

RJ11 cable system and controller is at end of
communications link

Vapor-logic
keypad/display

Previous BACnet
MSTP or Modbus Next multitank humidifier
device

Twisted pair
Twisted pair

Next BACnet MSTP or Modbus device Previous multitank humidifier

Protocessor module (optional)

Previous LonTalk device
A

B LonTalk terminals

Twisted pair

Next LonTalk device

20 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 INSTALLATION

Step 1 – Field wiring: Communication connections

WEB INTERFACE COMMUNICATION FIGURE 21-1: TERMINAL P9
Utilizing the Vapor-logic Web interface is optional. The humidifier can be
operated using the keypad/display and/or the Web interface. When using the
Web interface, the humidifier can be accessed by a computer either directly or
through a network. Each Vapor-logic controller ships with the static IP address
of 192.168.1.195. This allows users to locate the Web interface upon start-up.
After initial start-up, the IP address can remain as is, be re-assigned as another
static address, or configured to automatically go out and find an IP address on
the network using DHCP. See the steps below for information about connecting
to the humidifier using the Web interface.

CONNECTING WEB INTERFACE DIRECTLY TO A COMPUTER NOT ON A NETWORK Terminal P9:

1. Connect the Ethernet cable. Ethernet

Insert the male end of an RJ45 Ethernet cable into the Vapor‑logic board at
P9 (labeled Ethernet; see Figure 21-1) until you hear a click sound. Insert FIGURE 21-2:
the other end of the cable into a computer. Since the Ethernet port on the CHECKING YOUR IP ADDRESS
Vapor-logic board is auto-sensing, either a straight-through or crossover
cable will work.

2. Check the current IP address of your computer.

Connecting a computer to the humidifier requires that the computer being
used has the same network address range as Vapor‑logic. In order to
validate this, check the IP address of the computer being used by going to
the computer’s Start menu and selecting Run. When the box shown below
appears, type in cmd on the Open line and hit OK.

Vapor-logic default IP address

192.168.1.195

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 21

 INSTALLATION

Step 1 – Field wiring: Communication connections

After a system prompt appears, type in ipconfig and then hit Enter.
The current IP address of the computer should appear. If the first three
segments of that IP address are different than the first three segments of
the humidifier’s default IP (192.168.1.xxx), you must change either your
computer or Vapor-logic’s IP address such that they match each other.

FIGURE 22-1: CHECKING YOUR IP ADDRESS

3. Change the IP address of your humidifier or computer if necessary.

a. Change the IP address of the humidifier to work with your computer.
The most straightforward way to change the IP address of the
humidifier using Vapor-logic is to use the keypad/display. Go to Setup/
Communications/Network IP address on the keypad/display and
change the IP address such that the first three segments of the computer’s
settings match the network address. Make sure the last digit of the IP
address is different between the humidifier and the computer. Cycle
power of Vapor-logic board for address change to take effect.
b. Change the IP address of your computer to match the humidifier.
Changing the IP address of the computer being used will likely require
administrative privileges for your company’s network. Please consult
your IT department for this task.

22 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 INSTALLATION

Step 1 – Field wiring: Communication connections

4. Connect to the humidifier. FIGURE 23-1: ENTERING THE IP ADDRESS

a. Using a computer connected to the Vapor-logic board, open a Web

browser such as Mozilla® Firefox® or Internet Explorer®.
b. Find the browser address bar (see Figure 23-1), delete all existing text
in the browser address bar, type the Vapor‑logic IP address into the
browser’s address bar, and press Enter.
Note: The Vapor-logic default IP address is 192.168.1.195

CONNECTING WEB INTERFACE TO AN ETHERNET NETWORK

Enter the IP address in your browser’s address bar
See Caution at right before proceeding.

If your network uses DHCP (Dynamic Host Configuration Protocol), use the
keypad/display to navigate to:
Setup/Communications/Network IP Address. Enable DHCP and restart the
CAUTION
Vapor-logic board.
Vapor-logic IP address
The most current IP address can always be found by using the keypad/display Before you connect a Vapor-logic
device to a network, please contact
to navigate to:
your IT department. Given that the
Set-Up/Communications/Network IP Address. Vapor-logic controller ships with a
static IP address, it is important to
Important: DHCP cannot be enabled from the Web interface; it must be
ensure that there is not another device
enabled using the keypad/display. with that same IP address already on
the network. Working with your IT
OTHER COMMUNICATION CONNECTIONS department before network connection
For BACnet or LonTalk installation instructions, see Page 74. will help ensure the integrity of the
For multiple-tank installation instructions, see Page 84. network and the devices on that
network

DHCP and IP address

When DHCP is enabled, the server
can dynamically change the IP
address of Vapor-logic, making
existing bookmarks unusable.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 23

 INSTALLATION

Step 1 – Field wiring

PROGRAMMABLE RELAYS (DRY CONTACT) FIGURE 24-1: TERMINAL P12 AND P16
See “Programmable relay maximum current” in Caution below.

See Figure 25-1. Connect wiring for remote signaling using a

programmable relay (dry contact) by inserting wires into the terminal block
plug at P12 or P16, per the wiring diagram in Figure 25-1. Tighten screws.

This connection allows remote activation of devices such as fans or signal

lights. Output parameters are defined during Step 2 of the installation process.
Terminal
P16

CAUTION
Programmable relay maximum current
Programmable relay (dry contact) (P12) is rated for 125 VAC, 3 AMP or 30 VDC, 3
AMP maximum. Exceeding this maximum rating can cause the relay component or
the Vapor-logic board to fail.

Terminal
P12

Terminal P16:
NO-2 = Relay 2, normally open
PV/CA = Power vent/combustion air control
signal (24 vac output)
SDU = Space Distribution Unit (24 vac output)

Terminal P12:
Programmable relay (dry contact)
NO-1 = Relay 1, normally open
C-1 = Common 1
C-2 = Common 2

24 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 INSTALLATION

Step 1 – Field wiring

FIGURE 25-1: VAPOR-LOGIC PROGRAMMABLE RELAY WIRING CONNECTIONS FIGURE 25-2: TERMINAL P15

Vapor-logic relay #1 Vapor-logic relay #2

P12 P16
Normally open #1
Normally open #2
Common #1
Terminal
P15
Contacts rated 230
VAC/3 AMP or 30 Common #2
VDC/3 AMP, optional
by others

Key
Control circuit wiring Optional field

Field wiring
Break to external
Optional factory connections diagram

Terminal P15:
24vac = Power to combustion air switch
AREA-TYPE AND SDU DISPERSION FANS CAsw = Combust. air sw. (24vac input)
Connect wiring for Area-type and Space Distribution Unit (SDU) dispersion fans 24vac = Power to power vent switch
PVsw = Power vent switch (24vac input)
by inserting the wire into the terminal block plug at P16 (labeled SDU). Tighten
screws.

OPTIONAL COMBUSTION AIR SWITCH AND POWER VENT (GTS SYSTEMS)

Connect wiring for GTS combustion air switch and/or GTS power vent by
inserting wires into the terminal block plugs at P15 and P16. Tighten screws.
Remove shunt on J403 (combustion air) or J404 (power vent) if it is installed.

The combustion air switch is on the combustion air damper. The power vent
switch indicates airflow at the power venter.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 25

 INSTALLATION

Step 1 – Field wiring: Sensor placement

HUMIDISTAT AND SENSOR LOCATIONS ARE CRITICAL Other factors affecting humidity control
Humidistat and sensor location have a significant impact on humidifier Humidity control involves more than the
controller’s ability to control the system. Other
performance. In most cases, do not interchange duct and room humidity
factors that play an important role in overall
devices. Room humidity devices are calibrated with zero or little airflow; system control are:
whereas duct humidity devices require air passing across them. • Size of humidification system relative to
load
Recommended sensor locations (see Figure 27): • Overall system dynamics associated with
moisture migration time lags
A Ideal. Ensures the best uniform mix of dry and moist air with stable • Accuracy of humidistats and humidity
temperature control. transmitters and their location

B Acceptable, but room environment may affect controllability, such as when • Dry bulb temperature accuracy in space
or duct
sensor is too close to air grilles, registers, or heat radiation from room
lighting. • Velocities and airflow patterns in ducts
and space environments
C Acceptable. Provides uniform mixture of dry and moist air. If extended time • Electrical noise or interference
lag exists between moisture generation and sensing, extend sampling time.
D Acceptable (behind wall or partition) for sampling entire room if sensor is
near an air exhaust return outlet. Typical placement for sampling a critical
area.
E Not acceptable. These locations may not represent actual overall conditions
in the space.
F Not acceptable. Do not place sensors near windows, door passageways,
or areas of stagnant airflow.
G Best sensing location for a high-limit humidistat or humidity transmitter and
airflow proving switch.
mc_060508_0750

26 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 INSTALLATION

Step 1 – Field wiring: Sensor placement

FIGURE 27-1: RECOMMENDED SENSOR LOCATION

High limit humidistat or high limit transmitter

8' to 12' (set at 90% RH maximum) for VAV applications
Outside air (2.4 m to 3.7 m)
min. Airflow switch or differential pressure switch
Damper control (sail type recommended for VAV applications)
Relief air Return air C Air handling G
unit

Window Vapor absorption has taken place

Point of vapor absorption
D Steam dispersion assembly
E F
Turning vanes
A B

F E F
DC-1084

Doorway Window Temperature compensation option: Place a temperature compensation sensor on the
lower corner of the inside surface of double-pane window glass on north- or northeast-
facing window.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 27

 INSTALLATION

Step 2 – Setup
To simplify the field-installation process, humidifiers are sent from the factory FIGURE 28-1: KEYPAD/DISPLAY SCREENS
configured as ordered. However, some settings are unknown at the factory
and need to be defined during the setup process using the Setup menu. The
“A” indicates that these
Setup menu is also where you make future system setting changes. settings apply to Tank A.
All humidifier tanks are
To begin the field setup process, go to the Setup menu on either the labeled as “A” except
keypad/display or the Web interface. Setup menu parameters are listed in “1/15” indicates in applications where
the highlighted item multiple humidifiers
Table 30-1. Options and defaults are the same whether viewed from the are controlled by one
is the first of fifteen
keypad/display or Web interface. However, labels may be abbreviated on items controller.
the keypad/display.

USING THE KEYPAD/DISPLAY

SETUP 1/15 A
To access the Setup menu on the keypad/display, press the Main softkey
In p ut sig nal
on the Vapor-logic keypad (see figure below). Press the Down arrow on the
Limit controls
keypad until Setup is highlighted. Press Enter. Water t yp e
Water mana g e m ent
After entering the Setup menu, press the Up and Down arrows to scroll Fan-based dis p ersion
through all setup parameters or to change values. Use the Enter key to MAIN HOME BACK
select parameters.
Push Up or Down arrow
to scroll through menu
FIGURE 28-2: USING THE VAPOR-LOGIC KEYPAD items; press Enter to
select highlighted item
Typical Home screen

INPUT SIGNAL 1/4 A

Press Main
RH transmitter
softkey to go Dew p t transmitter
to Main menu; De mand sig nal
press Up or Hu midistat
Down arrow to
move through
menus and MAIN HOME BACK
screens
RH X-MITTER 2/4 A
Press Up or
Transmitter enabled
Down arrow to On
move through
menus and Press
Enter to
RH set p t
screens
select or 35%
confirm MAIN HOME BACK

28 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 INSTALLATION

Step 2 – Setup
USING THE WEB INTERFACE
Although not required for humidifier operation, the Web interface allows
convenient and remote access to Vapor-logic.

See Page 21 for Web interface connection and IP address instructions.

Follow the instructions below to complete the setup process.

FIGURE 29-1: USING THE VAPOR-LOGIC WEB INTERFACE ( SETUP SCREEN SHOWN)

Click on a tab label to move to another screen

Click on
CHANGE to
change value

To change value:
Highlight value;
type in new value;
click on APPLY
Click here
to view
alarms

Click here to
view messages

Click on label
to contract (–)
or expand (+)
menu item

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 29

 INSTALLATION

Step 2 – Setup

Table 30-1:
Setup menu
Minimum Maximum
Menu item Default value Units Notes
value value

Note: Your system might not have all of the items listed in this table (Pages 30 through 36).
TDS settings (not available in Europe)
Alarm will occur at 75 ppm if configured to alarm
Alarm and Alarm and
High TDS causes? Message only -- for High TDS. Message will occur at "TDS message
message message
setpoint" setting.
TDS message setpoint 50 25 75 --
Input signal
RH transmitter -- -- -- --
Transmitter enabled -- No Yes --
RH set point 35 0 100 %
RH offset 0 -20 20 %
PID tuning -- -- -- --
RH PID band 10 0 50 % DriSteem recommends using default values for offsets
Proportional gain 80 0 1000 --- and PID settings when first setting up your humidifier.

Integral gain 40 0 1000 ---

Derivative gain 0 0 1000 ---
Dew pt transmitter -- -- -- --
Transmitter enabled -- No Yes --
50 20 80 °F
Dew point set point
10 -6 26 °C
0 -20 20 °F
Dew point offset
0 -11 11 °C
Dew point minimum 0 -100 Maximum °F /°C
Dew point maximum 100 Minimum 100 °F /°C
PID tuning -- -- -- -- DriSteem recommends using default values for offsets
10 1 20 °F and PID settings when first setting up your humidifier.
Dew point PID band
5 1 20 °C
Proportional gain 80 0 1000 --
Integral gain 40 0 1000 --
Derivative gain 0 0 1000 --
Continued

30 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 INSTALLATION

Step 2 – Setup

Table 30-1:
Setup menu (continued)
Minimum Maximum
Menu item Default value Units Notes
value value

Demand signal -- -- -- --

VDC signal -- -- -- --

VDC signal enabled -- No Yes --

0% output at 1.0 0.0 Maximum VDC

100% output at 9.0 Minimum 10.0 VDC

mA signal -- -- -- --

mA signal enabled -- No Yes --

0% output at 4.0 0.0 Maximum mA

100% output at 20.0 Minimum 20.0 mA

Control via Modbus -- -- -- --

Modbus controlled No No Yes -- Choose Modbus, BACnet, or LonTalk in this section

only if your demand input signal is via Modbus,
Control via BACnet -- -- -- -- BACnet, or LonTalk. If you are interoperating (sharing
BACnet controlled No No Yes -- operating parameters with a building automation
system) using Modbus, BACnet, or LonTalk protocols,
Control via LonTalk -- -- -- -- see also the Communications Setup options.

LonTalk controlled No No Yes --

Humidistat -- -- -- --

Humidistat enabled No No Yes --

Limit control

HL switch -- -- -- --

Switch in system Yes No Yes --

HL transmitter -- -- -- --

Transmitter enabled No No Yes --

Duct HL set point 80 5 95 % RH

Span (throttle span) is an offset below the high limit
set point where the humidifier reduces output but
Duct HL span 5 0 20 % RH
does not turn off until the device high limit set point is
reached.
Duct HL offset 0 -20 20 % RH
Water type
(not an XT menu item)

Potable enabled -- No Yes --

WARNING
Softened enabled -- No Yes -- Water type setting
Changing the water type setting from potable/
softened to DI/RO, or from DI/RO to potable/
softened requires humidifier hardware changes.
Changing the water type setting without the required
DI/RO enabled -- No Yes --
hardware changes can cause component failure,
severe property damage, severe personal injury, or
death.

Continued

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 31

 INSTALLATION

Step 2 – Setup

Table 30-1:
Setup menu (continued)
Minimum Maximum
Menu item Default value Units Notes
value value

Water management

Drain valve
-- -- -- --
(not an XT menu item)

Damper Motorized
Type Model-specific -- Changing drain valve settings requires changing
(Honeywell®) (Belmo®)
the drain valve. Not all options available for all
Actuator Electric Manual Electric -- models.

Normally closed Normally Normally

Status --
(N.C.) closed (N.C.) open (N.O.)

Drain tempering Enabled Disabled Enabled --

Auto drain/flush requires a humidifier with an

Auto drain/flush
-- -- -- -- electric drain valve. Not all options available for all
(not an XT menu item)
models.
When enabled, the humidifier automatically drains
Drain/flush enabled -- No Yes --
and then flushes the tank at user-defined intervals.
0 2,200,000 lbs Select amount of water to be converted to steam
Usage Model-specific
0 1,000,000 kg before auto drain/flush starts.

Schedule enabled -- -- -- --
Allowed days -- -- -- --
Sunday Yes No Yes --
Monday Yes No Yes --
Tuesday Yes No Yes -- Select days of week auto drain/flush is allowed
Wednesday Yes No Yes -- once usage requirement is met.

Thursday Yes No Yes --

Friday Yes No Yes --
Saturday Yes No Yes --
Select time of day (24 hour clock) auto drain/flush
Time to drain/flush 0 0 23 --
starts once usage requirement is met.
Select number of minutes for drain valve to remain
Drain duration Model-specific 0 120 Minutes open during auto drain/flush. Default value is
based on tank and valve size.
Select number of minutes for fill valve to remain
Flush duration Model-specific 0 15 Minutes
open during flushing.
Continued

32 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 INSTALLATION

Step 2 – Setup

Table 30-1:
Setup menu (continued)
Minimum Maximum
Menu item Default value Units Notes
value value

Water management (continued)

Skim
-- -- -- --
(not an XT menu item)

Skim enabled Yes No Yes -- Enabled as default except on DI water systems.

Skim duration Model-specific 0 120 Seconds
End-of-season drain -- -- -- --
Enabled as default except on DI water systems.
EOS enabled Yes No Yes -- If enabled, the humidifier tank drains after the
humidifier has been idle for a user-defined time.
Select number of hours humidifier is idle before
Idle time for EOS 72 1 168 Hours
end-of-season draining starts.
Aquastat
-- -- -- --
(not an XT menu item) The minimum aquastat setting prevents tank water
Aquastat enabled -- No Yes -- freezing. Higher settings keep tank water warm,
reducing time required to bring water to boiling
50 40 180 °F after a call for humidity.
Aquastat set point
10 4 82 °C
Service interval -- -- -- --
Model-specific 0 2,200,000 lbs
Select amount of water to be converted to steam or
Service interval Model-specific 0 1,000,000 kg hours that humidifier runs before service interval is
reached.
Model-specific 0 10,000 Hours
Probe threshold -- -- -- --
Probe threshold 800 300 8000 -- See probe signal description in status chart.
Amount of time the water probe must be in or out of
Probe debounce time 2 1 10 Seconds
water to change the water/no water state.
Fill fault time 40 40 250 Minutes Amount of fill time before an alarm will occur.
Continued

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 33

 INSTALLATION

Step 2 – Setup

Table 30-1:
Setup menu (continued)
Minimum
Menu item Default value Maximum value Units Notes
value

XT management (XT only)

Contactor is on during draining. May provide more

Mini drain No No Yes --
stable output steam.
Enables drain tempering for XT. Tempering turns
on the fill valve whenever the drain is energized
Tempering enabled Model-specific No Yes --
and may not be required if the drain line can
accommodate boiling water.
TP Mode allows the humidifier to more closely track
TP Mode enabled Model-specific No Yes -- demand by cycling the contactor when current is
greater than the demand signal requirement.
Turn on percent 20 10 20 % Minimum run level when TP mode is disabled.
Left cylinder drain Closed Closed Open -- Force specific drain to open
Right cylinder drain Closed Closed Open -- Force specific drain to open
Disable left cylinder No No Yes -- Disables specific cylinder
Disable right cylinder No No Yes -- Disables specific cylinder
Clear foaming fault Yes No Yes -- Auto clearing of foaming fault
Pulse fill mode No No Yes --
Changing fan-based dispersion settings can require
Fan-based dispersion
component changes for system to operate correctly.
An SDU is a space distribution unit, which
SDU on system -- No Yes --
disperses steam using a fan housed in a cabinet.
An Area-type dispersion unit is a caged fan
Area-type on system -- No Yes --
mounted on top of the humidifier tank.
Select number of minutes fan-based dispersion unit
Output time delay 5 1 30 Minutes operates after water in tank stops boiling. A delay
keeps the fan running until all steam is dispersed.
Remote temp sensor Changing temperature sensor settings can require
(not an XT menu item) component changes for system to operate correctly.
Temp comp enabled -- No Yes --
Temp monitor enabled -- No Yes --
0 -20 20 °F
Temp sensor offset
0 -11 11 °C
Continued

34 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 INSTALLATION

Step 2 – Setup

Table 30-1:
Setup menu (continued)
Minimum Maximum
Menu item Default value Units Notes
value value

Changing communications settings can require

Communications
component changes for system to operate correctly.
BACnet -- -- -- --
Unlock code 0 0 999999 --
BACnet enabled -- No Yes --
BACnet comm channel 19200MS/TP BACnet IP 76800 MS/TP --
Device instance 255 0 4194303 --
MS/TP station 1 0 127 -- MS/TP only
Max masters 127 0 127 -- MS/TP only
Max info frames 1 1 127
UDP port (47808) 47808 1024 65535 -- BACnet/IP only
Modbus -- -- -- --
Modbus enabled -- No Yes --
Modbus baud rate 9600 4800 38400 --
Modbus address 99 0 255 --
LonTalk -- -- -- --
LonTalk enabled -- No Yes --
Network IP address -- -- -- --
255.255.
Network IP address 192.168.1.195 0.0.0.0 --
255.255
255.255.
Network IP mask 255.255.255.0 0.0.0.0
255.255
255.255
Network gateway 192.168.1.1 0.0.0.0
255.255
Use keypad/display to access this menu item. This
Enable DHCP No No Yes --
item is not available when using the Web interface.
Programmable outputs

CAUTION
Programmable dry contact maximum current
Programmable dry contact (P12 or P16) is rated for
Dry contact 1 or 2 -- -- -- -- 125 VAC, 3 AMP or 30 VDC, 3 AMP maximum.
Exceeding this maximum rating can cause the dry
contact (relay) component or the Vapor‑logic board
to fail.
A dry contact activates whenever there is an alarm,
Default alarms Yes No Yes --
which does not auto-clear.
A dry contact activates whenever there are alarms
Selected alarms/messages No No Yes --
or messages selected from the setup list.
A dry contact activates when the humidifier is
Heat on-off enabled No No Yes --
heating.
Steam yes-no enabled A dry contact activates when the tank temperature
No No Yes --
(not an XT menu item) reaches boiling.
Normally Normally
Contact behavior Normally open -- Contact action on event.
open closed
Continued

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 35

 INSTALLATION

Step 2 – Setup

Table 30-1:
Setup menu (continued)
Minimum Maximum
Menu item Default value Units Notes
value value

Set date and time

Date -- mm/dd/yy
Time -- 0:00 23:59 Hours:Minutes 24 hour clock
Language
Display in English -- No Yes --
Display in French -- No Yes --
Select one language for both keypad/display and
Display in German -- No Yes --
Web interface communications.
Display in Spanish -- No Yes --
Display in Dutch -- No Yes --
Units
Display inch-pound -- No Yes --
Display SI -- No Yes --
Security
Require password No No Yes --
Set password None 0 9999 -- Enter a four-digit password using numbers only.
The number of inactivity minutes Vapor-logic remains
Time-out 5 1 120 Minutes in read-write mode before returning to read-only
mode
Capacity adjust
Capacity calibration Changing the capacity calibration setting changes
100.0 0.0 245.0 %
(GTS systems) reported, not actual, humidifier output.

Capacity calibration Changing the capacity setting changes the actual

100.0 10.0 100.0 %
(XT systems) humidifier output.
Idle time
Select number of minutes keypad/display remains
Idle time 5 1 120 Minutes
idle before returning to the Home screen.

Reset to defaults
CAUTION
These actions cannot be reversed
Select this if you want to reset all humidifier settings to
Reset to defaults -- -- -- --
factory defaults
Reset ignitor counts? -- -- -- -- Select this if you want to reset the GTS ignitor counts.
Valve span
Min 2.00
Span 0.00 10.00 VDC
Max 10.00

36 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 INSTALLATION

Step 3 – Startup
To start up your humidifier, go to the Start-up Checklist in your humidifier’s Multi-tank mode
Note: XT and Low-maintenance humidifiers do
Installation, Operation, and Maintenance manual. The remainder of this page not operate in multi-tank mode.
is for XT humidifiers only.
See “Multiple-tank operation” on Page 84.
Note: Connect a maximum of two cylinders to any single dispersion unit.
Connection of more than two cylinders requires separate dispersion. Reference
equipment installation and piping instructions in the XT series humidifier
FIGURE 37-1: VAPOR-LOGIC BOARD
Installation, Operation and Maintenance manual.
CONNECTIONS FOR STAGING MULTIPLE
XT HUMIDIFIERS
STAGING MULTIPLE XT HUMIDIFIERS
Up to four XT electrode steam humidifiers can be staged to operate in Primary XT humidifier (H-1) board
sequence. In a sequenced application, one control input signal is divided by Corner of Vapor-logic board opposite from
Ethernet connection shown
user-selectable settings among the humidifiers connected in sequence. See the
Vapor-logic board connection points in Figure 37-1.
Connect Steam
to RH connection
CONTROL INPUT EXAMPLES
points of staged
Table 37-1: humidifiers.
Control input example for four XT humidifiers in sequence Connect Ground
( )to Ground
XT connection
Control input Result
humidifier points of staged
humidifiers.
Any valid Vapor-logic 0 to 100% steam output corresponding to 4–20 mA
H-1 (primary)
control input or 0–10 VDC control signal

H-2 (staged) 4–6 VDC* 0 to 100% steam output scaled across 4–6 VDC range

H-3 (staged) 6–8 VDC* 0 to 100% steam output scaled across 6–8 VDC range

H-4 (staged) 8–10 VDC* 0 to 100% steam output scaled across 8–10 VDC range

* User-selectable, 0–10 VDC in 0.1 V increments.

Table 37-2:
Control input example for two XT humidifiers in sequence
XT
Control input Result
humidifier

Any valid Vapor-logic 0 to 100% steam output corresponding to 4–20 mA Contact DriSteem if you need assistance
H-1 (primary)
control input or 0 to 10 VDC control signal staging XT humidifiers. See “Calling DriSteem
Technical Support” on Page 91.
H-2 (staged) 5–10 VDC* 0 to 100% steam output scaled across 5–10 VDC range

* User-selectable, 0–10 VDC in 0.1 V increments.

SETTING CONTROL INPUT RANGES

1. Using the keypad/display or Web interface, go to the Tank setup menu,
then select Input signal, then Demand signal.
2. Select Yes to enable user input.
3. Scroll down to select the range for each staged input.
4. Press the Enter key to confirm selections.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 37

 OPERATION

Using menus and screens

VAPOR-LOGIC KEYPAD/DISPLAY HAS THE FOLLOWING MENUS AND SCREENS: FIGURE 38-1:
• Home screen USING THE KEYPAD/DISPLAY
• Main menu, and four submenus:
– Status
– Diagnostics
– Alarms
– Setup Press the Main
softkey to go to
Press the Main softkey to go to the Main menu selection screen. Press the Up Status, Diagnostics,
Alarms, or Setup
and Down arrow keys to choose a submenu and press Enter to select.
screens

Vapor-logic Web interface has the following screens: Press the Up or

• Status Down arrow keys to
choose a submenu
• Diagnostics or change a value.
• Alarms Press the Enter key
to select a submenu
• Setup or value.
• Help

FIGURE 38-2: USING THE VAPOR-LOGIC WEB INTERFACE (STATUS SCREEN SHOWN)

Click on a tab label to move to another screen

Click on CHANGE
to change value.
Note that most
system parameters
Click here are changed in the
to view Setup menu.
alarms

Click here
to view
Drag scroll bar
messages
to view more
of the window

38 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Home screen (keypad/display)

Click on tab labels to go to other screens. The highlighted tab indicates the FIGURE 39-1:
current screen. KEYPAD/DISPLAY HOME SCREEN

Vapor-logic returns to the Home screen on the keypad/display after a user-

SPACE RH SET PT 212˚F
35%
defined period of idleness. The Home screen displays the items most frequently
viewed: Actual space RH or dew point, RH or dew point set point, tank/system
34% OUTPUT
TANK A 59%
output or steam demand, humidifier mode, and tank activities such as filling
MODE: Auto Fillin g
skimming, heating, boiling, and draining.
MAIN MESSAGE AL AR M
There is a tank level indicator on the right side of the screen. See the table
below for a description of tank level indicators.
FIGURE 39-2: WATER LEVEL CONTROL
Above the tank level indicator is a tank temperature display showing actual FOR TAP/SOFTENED WATER SYSTEMS
tank temperature.

CHANGING MODE AND SET POINT

Mode and Set point can be changed from the Home screen. Press the Up or
Down arrow key until the Set point or Mode is highlighted, press Enter, press
Up or Down arrow key to change value, press Enter to confirm. All other
parameters shown on the Home screen are for viewing only and cannot be Top probe
changed. Go to the Setup menu to change these items.
VLC-OM-030 Mid probe
Low probe
TANK ACTIVITIES DEFINED
Tank-level icons indicate water level at the
• Filling: Fill valve remains open until water reaches operating level. water level control probe. See “Water level
control” on Page 59.
• Skimming: Fill valve is open to allow water to flow through the overflow port,
skimming off precipitated minerals (tap and softened water systems only).
• Draining: Tank is draining.
Table 39-1:
• Flushing: Fill and drain valve are open to flush tank. Fill icon
Indicates in:
• Heating: Water in tank is heating.
Tap/softened
DI/RO
• Boiling: Water in tank is boiling and there is a demand for humidity. water systems
water systems
(see Figure 39-2)
• Hot: Water is at boiling temperature and there is no demand for humidity. Water is
Water level is above top
above low
• Warm: Water temperature is equal to or greater than 100 °F (38 °C) and probe.
water level.
not boiling.
Water level is between
N/A
• Cold: Water temperature is less than 100 °F (38 °C). mid and top probes.
Water level is between
• EOS drain: Humidifier is in end-of-season drain. low and mid probes.
N/A

• Empty: There is no water in the humidifier and there is no demand for humidity. Water is
below low
Water level is below low
• Idle: No demand or an active alarm preventing operation (XT only). probe (heat is disabled).
water level
(heat is
• TmpDrain: Humidifier is doing a drain to reduce conductivity or eliminate disabled).
foam. Process can take several minutes for large-capacity humidifiers. (XT only). Note: X
 T humidifier display does not include
fill icon (see Page 61).
• Full: Water level has reached top of cylinder (XT only).

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 39

 OPERATION

Status screen
Using either the keypad/display or the Web interface, the Status screen is FIGURE 40-1: KEYPAD/DISPLAY SCREENS
where all humidifier parameters can be viewed.

See the tables on the following pages for Status screen item descriptions “A” indicates these
settings apply to Tank A.
for both the keypad/display and Web interface. All humidifier tanks are
labeled as “A” except
in applications where
multiple humidifiers
FIGURE 40-2: WEB INTERFACE STATUS SCREEN “1/4” indicates the are controlled by one
highlighted item is controller.
the first of four items

MAIN MENU 1/4 A

Tank status
Dia g nostics
Alarms
Tank setu p

HOME
Push Up or Down arrow
to scroll through menu
Drag scroll bar items; press Enter to
to view more of select highlighted item
the window

TANK STATUS 2/24 A

Mode
Auto

Space RH
34% RH
MAIN HOME BACK

TANK STATUS 3/24 A

S p ace RH
34% RH

RH set p oint
35% RH
MAIN HOME BACK

40 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Status screen

Table 41-1:
Status screen
Note: Your system might not have all of the items listed in this table (Pages 41 and 42).
Minimum Maximum
Menu item Default value Units Notes
value value
Operating mode of humidifier. Choose from Auto, Standby, or Drain.
• In Auto mode, the humidifier operates normally. All humidifier
components are monitored and controlled. If there is a call for
humidification, the system reacts.
• In Standby mode, the humidifier is offline. All humidity control inputs
appear but are not acted upon; however, if the tank temperature falls
Mode Standby -- -- --
below the freeze protect set point, the drain valve opens.
• In Drain mode, the automatic drain valve (if so equipped) opens and
the tank drains. All humidifier operation is suspended, and the drain
valve remains open until the unit is taken out of Drain tank mode.
• See the Diagnostics section for information about Test outputs and Test
run modes.
Space RH -- 0 100 %

RH set point 35 0 100 %

-- 0 10 VDC
Input signal
-- 0 20 mA

-- 0 100 °F
Dew point
-- -17 37 °C

50 20 80 °F
Dew point set point
10 -6 26 °C

Storage pressure -- 0 100 psi

TDS -- 0 9999 ppm

Inlet pressure switch -- No water Water --

Steam demand -- 0 100 % Displays steam demand as a percent of capacity
Steam output -- 0 100 % Displays steam output as a percent of capacity
-- 0 100,000 lbs/hr
Steam production
-- 0 100,000 kg/h

Duct RH -- 0 100 %

Duct HL switch -- Open Closed --

Duct HL set point 80 5 95 %

Duct HL signal -- 0 20 mA

-- -30 275 °F
Tank temperature
-- -34 135 °C

Tank temp signal -- 0 2200 Ohms

-- -20 160 °F
Aux temperature
-- -29 71 °C

Aux temp signal -- 0 26 mA

Continued

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 41

 OPERATION

Status screen

Table 41-1:
Status screen (continued)
Minimum Maximum
Menu item Default value Units Notes
value value
Board voltage 24 0 30 VAC
Board temp -- 0 200 °F
High probe signal* -- 0 14000 counts Systems using tap or softened water control water levels
electronically using a three-rod probe. The controller initiates the
High water probe* -- Water No water --
following events when the probes are in contact with water:
Mid probe signal* -- 0 14000 counts High probe: Fill valve closes
Mid water probe* -- Water No water -- Mid probe: Fill valve opens
Low probe: Low water cut-off
Low probe signal* -- 0 14000 counts The display indicates the probe is in contact with water by
indicating “Water” or “No water.”

The high, mid, and low probe signal counts, displayed on the
Status screen, indicate:
Low water probe* -- Water No water -- <800 = Probe is properly reading water
800-1200 = Faulty water probe (causes a “Faulty water probe”
alarm) 1200-1600 = Probe requires maintenance (causes a
“Clean probes” message)
>1600 = Probe is dry
DI low water
-- Water No water --
switch*
Airflow switch -- Flow No flow --
Interlock switch -- Open Closed --

Water until -- -- 2,200,000 lbs Displays amount of water to be converted to steam before
drain/flush* -- -- 1,000,000 kg automatic drain sequence (ADS) can begin

-- -- 2,200,000 lbs Displays amount of water to be converted to steam before next

Water until service
-- -- 1,000,000 kg recommended maintenance service

Pump hours -- 0 1,000,000 hours

Hours until service -- 0 10,000 hours XT systems only
Lifetime hours -- 0 100,000 hours XT systems only
Blower 1 tach -- 0 7000 rpm Displays rotation speed of Blower 1 (GTS systems only)
Blower 2 tach -- 0 7000 rpm Displays rotation speed of Blower 2 (GTS systems only)
Blower 3 tach -- 0 7000 rpm Displays rotation speed of Blower 3 (GTS systems only)
Blower 4 tach -- 0 7000 rpm Displays rotation speed of Blower 4 (GTS systems only)
Gas valve 1 -- Open Closed -- GTS systems only
Gas valve 2 -- Open Closed -- GTS systems only
Gas valve 3 -- Open Closed -- GTS systems only
Gas valve 4 -- Open Closed -- GTS systems only
* Not an XT menu item

42 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Status screen

Table 41-1:
Status screen (continued)
Minimum Maximum
Menu item Default value Units Notes
value value
Combust air switch -- Flow No Flow -- GTS 04 systems only
Power vent switch -- Open Closed -- GTS 04 systems only
Flue pressure switch -- Open Closed -- GTS systems only
Low water sensor -- No water Water -- GTS 04 systems only
Model
Current -- 0 Amps XT systems only
dependent
High water probe -- No water Water -- XT systems only
Model
Current 2 -- 0 -- Right cylinder of 2-cylinder model, XT systems only
dependent
High water probe 2 -- No water Water Amps Right cylinder of 2-cylinder model, XT systems only

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 43

 OPERATION

Diagnostics screen
The Diagnostics screen provides access to system messages, system data, FIGURE 44-1: KEYPAD/DISPLAY SCREENS
humidifier information, and test functions.
SPACE RH SET PT 212˚F
35%
34%
See the following pages for more information about the Diagnostics screen.
OUTPUT
SYSTEM MESSAGES AND THE MESSAGES LOG TANK A 59%
When a system event occurs (e.g., when regularly scheduled unit servicing MODE: Auto Fillin g
becomes due), a system message is added to the Messages Log (“Service MAIN MESSAGE AL AR M
unit”). The Messages Log displays the message name, date and time of
occurrence, plus whether the message is active, has been cleared by
Press the MESSAGE softkey,
an operator, or auto-cleared by Vapor-logic. Active messages display or select Messages from the
first in the Messages Log, followed by cleared messages, listed in order Diagnostics menu to view the
Messages Log.
of occurrence. The Messages Log displays up to ten messages. As new
messages enter the log, the oldest, cleared messages leave the log first.
DIAGNOSTICS 2/6 A
Messages auto-cleared by Vapor-logic describe events that have resolved
Messa g es
on their own. For example, a “No airflow” message appears when there is Dow nload data
no airflow in the duct. If airflow returns, the “No airflow” message auto- USB backu p/restore
clears, but stays in the Messages Log (per the rules described above) to let Hu midifier info
the operator know there was an airflow interruption. Test out p uts
MAIN HOME BACK
The keypad/display highlights the Message softkey label when there is a
system message. When this occurs, press the Message softkey to view the
DOWNLOAD DATA 1/2
Messages Log.
Dow nload all data
The Web interface displays a link to system messages in the upper left
corner of the screen. Click on the link to view system messages (see the Data point interval
next page). 60 seconds
MAIN HOME BACK
See Pages 68 through 73 for more information about downloading
data, USB backup and restore, and test modes.

44 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Diagnostics screen
FIGURE 45-1: VAPOR-LOGIC WEB INTERFACE DIAGNOSTICS SCREEN

Click on buttons to
activate functions.

View messages by clicking

on “View Messages” on
any screen or by opening Clear messages
the Diagnostics screen. by clicking here.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 45

 OPERATION

Diagnostics screen

Table 46-1:
Diagnostics menu
Minimum Maximum
Menu item Notes
value value
Note: Your system might not have all of the items listed in this table (Pages 46 through 48).

Download data

Download to USB -- -- Download all data sets to the USB flash drive.

Download via Ethernet -- -- Only available from web page

Data point interval 30 seconds 900 seconds Interval that data will be stored

USB backup/restore

Back up settings No Yes

Humidifier settings can be backed up to or restored from a USB flash drive.
Restore settings No Yes

Humidifier info

Factory string -- -- Displays as-shipped configuration string

Current string -- -- Displays current configuration string

Serial number -- -- Displays humidifier serial number

Firmware version -- -- Displays current firmware version of Vapor-logic control board

Firmware date -- -- Displays current firmware date of Vapor-logic control board

Model -- --

Voltage -- -- XT systems only

Phase -- -- XT systems only

Test outputs

Fill valve -- -- Cycles output to verify operation.

Universal water systems
Note:
Humidifiers with the universal water system use the same conductivity probes found in
the three-probe system. Additional valves and software algorithms measure and control
the water level for optimum operating efficiency. All water types and conductivities
work with the universal water system. Vapor-logic automatically provides steady steam
Pulse fill valve -- --
output while maintaining the water level between the bottom and middle probes.
The humidifier will periodically perform probe checks to insure that the probes are
being read accurately and to determine the quality of the incoming water. If the signal
from the probe assembly begins to deteriorate, the “Clean probes” message appears
in the Messages Log. Once the probe system reaches its maximum usable life, the
humidifier shuts down and the “Faulty water probe” alarm appears.
Drain valve -- --

Fan control -- -- Cycles output to verify operation.

Dry contact relay 1 or 2 -- --

Inlet valve -- --

Relief valve -- --

RO pump -- --
Continued

46 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Diagnostics screen

Table 45-1:
Diagnostics menu (continued)
Minimum Maximum
Menu item Default value Units Description
value value

Test outputs (continued)

Contactor 1, 2, 3, or 4 -- -- -- --

SSR control -- -- -- --

Ignition module 1, 2, 3, or 4 -- -- -- --
Cycles output to verify operation.
Blower speed control -- -- -- --

Power vent control -- -- -- --

Steam valve -- -- -- --

Test run*

Test run percent 0 0 100 % Set demand percent value between 0 and 100 to test.

Test run time 0 0 30 minutes Set test run time duration between 0 and 30 minutes.

Start

Stop

* Humidifier test run will not occur if safety circuits (for example, duct high limit switch, airflow proving switch, or safety interlock switch) are not
operating correctly.

Table 46-1:
Diagnostics menu
Message Description Does message auto-clear?

Messages

Replace contactors Contactors have reached normal life span. Replace contactors. No

Service unit Regularly scheduled unit servicing is due. No

Drain pending Auto drain/flush will occur at next scheduled time. Yes

No airflow No duct airflow. Yes

I-lock open Interlock safety switch is open. Yes

Freeze drain Tank has drained to prevent freezing. Yes

The humidifier is draining or has drained and remains inactive until receiving another call for
EOS active Yes
humidity.

Humidifier output has been reduced because temperature compensation sensor reads a temperature
Temp comp on Yes
on the inside-pane of an outside-wall window that could cause condensation.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 47

 OPERATION

Diagnostics screen

Table 46-1:
Diagnostics menu (continued)
Message Description Does message auto-clear?

Messages

Clean probes Water level control probes need cleaning. Check tank for cleaning. No
Duct HL trip Duct relative humidity has risen above the high limit set point, or high limit switch has opened. Yes

Duct high limit transmitter has entered the throttle span range and is approaching duct high limit set
Duct HL span Yes
point.
Insufficient water The low water probe is not in contact with water when there is a demand for humidity. Yes
Boiling temp Indicates actual humidifier boiling temperature at time of reading. This reading is taken after power-
Yes
calibrated up by the tank sensor at the time of first steam creation.
Clean water, or end of cylinder life.
After 10 hours of normalized 100% run time, target current has not been reached, water is at the
Check cylinder / high water probe, and current has not increased from the previous reading.
high water Humidifier continues to operate. Yes, if target current is
(XT systems only) reached
Clean supply water (cleaner than cylinder water). Filling has stopped due to reaching the high
water probe, and the current has decreased three times in a row.
Humidifier continues to operate.
Main enable open Indicates demand signal is being ignored due to main enable input being open. Yes
TDS measurement during RO production exceeds the TDS set point.
Excessive TDS The system will continue to operate but the membranes may need to be replaced. Yes
(Not available in Europe)
RO flush active The unit is performing an RO flush or has done so and remains inactive until receiving another call. Yes
Insufficient RO
The RO supply water cannot meet demand. No
water flow
Replace ignitors Replace ignitors soon. Ignitors have been cycled to 80% of their expected life or there are other
No
soon indications the ignitors may be worn out.
Low inlet water temp The inlet water temperature is below 56°F (13° C). Yes

Stage 1
efficiency below Stage 1 media is becoming clogged. Clean media or replace. Yes
50%
Stage 2
efficiency below Stage 2 media is becoming clogged. Clean media or replace. Yes
50%
Stage 3
efficiency below Stage 3 media is becoming clogged. Clean media or replace. Yes
50%

High flue temp, Flue temperature is close to exceeding rated value. The output will temporarily be reduced by
Yes
output reduced 50% to allow the flue to cool.

The drain temperature has exceeded 145°F (63° C) for one minute. The drain tempering device
Hot drain water Yes
may not be working properly.

Notes:
• The Messages Log displays message name, date and time of occurrence, plus “Active,” “Cleared” or “Auto-cleared.”
• Active messages display first in the Messages Log, followed by cleared messages (auto-cleared and/or manually-cleared) listed in order of
occurrence.
• The Messages Log displays a maximum of 10 messages. Cleared messages leave the log first.
• If a message event occurs and is not manually or auto cleared during unit operation, the message will stay there until there is demand and the unit
is running.

48 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Alarms screen
FIGURE 49-1: KEYPAD/DISPLAY SCREENS The Alarms menu displays system alarms. Using the keypad/display, go
to the Alarms menu by pressing the Alarms softkey (which will be flashing
SPACE RH SET PT 212˚F
if there is an Alarm), or by pressing the Home softkey and then the Alarms
35%
34% OUTPUT
softkey. Using the Web interface, click on the View Alarms link in the upper
left corner of any screen.
TANK A 59%
MODE: Auto Fillin g System alarms are listed in the Alarms Log. The Alarms Log displays the
MAIN MESSAGE AL AR M alarm name, date and time of occurrence, plus whether the alarm is active,
has been cleared by an operator, or auto-cleared by Vapor-logic. The
Alarms Log lists active alarms at the top of the list, followed by cleared
Press the ALARM softkey
when flashing, or select
alarms. The Alarms Log holds 30 alarms. As alarms are cleared, they
Alarms from the Main menu move down the list below active alarms. When the Alarms list reaches 30
to view the Alarms Log. alarms, new alarms add to the top of the list and the oldest, cleared alarms
leave the list. Alarm information is retained in nonvolatile memory if the
Vapor-logic board loses power.
AL AR MS 1/2 A
Water probes See Table 50-1 for alarms and their descriptions.
miswired
Manually cleared Alarm causes and recommended actions are listed in the troubleshooting
02-02-2008 12:23 section in this manual.

MAIN INFO CLEAR

FIGURE 49-2: VAPOR-LOGIC WEB INTERFACE ALARMS SCREEN

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 49

 OPERATION

Alarms screen

Table 50-1:
Alarms menu
Does alarm
Alarm label Description
auto-clear?
Tank temp sensor failed Tank temp sensor has failed. No
Tank temperature is greater than 230 °F (110 °C). Check for faulty tank temperature sensor, and ensure
Overtemp cutout that water level is not too low. Check for and correct any other possible safety issues. Push manual reset No
on overtemp cutout switch, and cycle controller power to clear alarm.
RH signal out of range RH signal is out of range. Yes

Dew point signal out of

Dew point signal is out of range. Yes
range

Demand signal out of range Demand signal is out of range. Yes

Duct RH signal out of range Duct RH signal is out of range. Sensor may be faulty. Yes
Aux temp sense out of range Auxiliary temp sensor signal is out of range. Yes
Water probe miswired Water probe head is miswired or faulty. Yes
Faulty water probe Water probe readings are suspect, likely caused by scale on probe. No
Excess fill time Fill valve has been on too long during initial tank fill. Bottom probe is not in contact with water. Yes
Excess refill time Re-filling is taking too long. Top probe is not in contact with water. Yes
Drain valve has been open for the prescribed amount of time based on the humidifier model, and water is
Tank not draining Yes
still touching the low water probe.
Fault occurs at boiling temperature plus 25 °F (13 °C). All units are put into a keep-cool state where
Tank overtemp fill and drain cycles operate to keep tank cool. First resolve any safety issues, then resolve whatever is No
causing the problem. Restart the controller to clear the alarm.
Humidifier continues to add water when there is no demand, signifying humidifier is continuing to make
steam. Humidifier is put into a keep-cool state where fill and drain cycles operate to keep tank water from
boiling. First resolve any safety issues, then resolve whatever is causing the problem. Restart the controller,
Excessive boil time No
and clear the alarm.
Note: This alarm applies only to non-DI/RO-water humidifiers and DI/RO-water humidifiers with EOS
drain.
Airflow proving switch in the SDU (space distribution unit, a fan-based dispersion assembly) indicates no
No SDU airflow Yes
airflow. No steam is produced while alarm is active.
Overtemp cutout circuit has opened. First resolve any safety issues, then resolve whatever is causing the
Overtemp cutout No
problem. Restart the controller to clear the alarm.
No power vent airflow
Pressure switch indicates there is no airflow at the power venter. Yes
(GTS systems only)
No combustion airflow
Switch indicates the combustion air damper is closed. Yes
(GTS systems only)
Blocked flue
Flue pressure switch indicates positive pressure in flue. Burner will not ignite when this fault is active. Yes
(GTS systems only)
Burner 1, 2, 3, or 4 fault Burner tried one or more times to light and did not succeed. Once this fault is active, Vapor-logic locks out
No
(GTS systems only) the burner and does not try to light it again until fault is cleared. Other burners can run.
Ignition mod. 1, 2, 3, or 4 Ignition module has not opened the gas valve. Once this fault is active, Vapor-logic locks out the ignition
No
fault (GTS systems only) module and does not try to start it again until fault is cleared. Other ignition modules can run.
Blower 1, 2, 3, or 4 fault
Blower is turning at less than the specified minimum RPM. Unit not allowed to run. Yes
(GTS systems only)
Gas valve 1, 2, 3, or 4 fault
Gas valve is on when it should be off. Unit not allowed to run. Yes
(GTS systems only)
Low water
Low water probe is in contact with water and low water sensor is not in contact with water. Yes
(GTS systems only)
Replace ignitors!
Replace ignitors! Max ignitor cycles reached. No
(GTS systems only)
Continued

50 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Alarms screen

Table 50-1:
Alarms menu (continued)
Does alarm
Alarm label Description
auto-clear?
The listed flue temperature switch or tank temperature switch has opened. These switches will close after
Flue or tank over-temp cutout Yes
the system has cooled.

Flue sensor out of range Flue temperature sensor signal is out of range. Yes

Drain sensor out of range Drain temperature sensor signal is out of range. Yes

XV header flooded
Float switch in Ultra-sorb Model XV header has detected a flooded header condition. Yes
(STS systems only)
No water.
Supply water failure, or drain malfunctioning/leaking.
Supply water failure
Fill has been on for 30 minutes without reaching high water probe or target current. Cycles the fill and No
(XT systems only)
drain valves 20 times and retries filling for 10 additional minutes before an alarm is generated. If not
corrected, humidifier shuts down.
Supply water failure 2
No water in right cylinder. See above. No
(XT systems only)
Continuous foaming causing a problem.
Target current has been reached but is now below the –10% of nominal current, and high water
probe has been wet for an extended period of time. – or –
Excessive foaming Fill was halted because top probe became wet, and current is reduced to 50% of when fill was halted.
No
(XT systems only) Humidifier will do a normal drain event. Alarm is generated if this condition occurs 10 times, indicating
that foaming is a persistent problem. If not corrected, humidifier shuts down.
Cylinder may need to be completely drained twice to prevent foaming. See “Start-up procedure” in
XT Electrode Steam Humidifier Installation, Operation, and Maintenance Manual shipped with the humidifier.
Excessive foaming 2 Continuous foaming causing a problem in right cylinder.
No
(XT systems only) See Excessive foaming.
Overcurrent; 120% over nominal.
Conductivity build-up; drain malfunctioning/plugged; or too much condensate return.
Drains up to 12 times to attempt to reduce current:
Overcurrent
• For drains 1 through 6, length of drain is incrementally increased. No
(XT systems only)
• For drains 4 through 12, drain valve is cycled ten times to loosen possible debris in drain.
• For drains 7 through 12, drain duration is identical to drains 1 through 6, but tempering is pulsed at
5-second intervals. If not corrected, humidifier shuts down.
Overcurrent 2
Overcurrent; 120% over nominal in right cylinder. See above. No
(XT systems only)
Current sensor out of range
XT current sensor is out of range. Yes
(XT systems only)
Current sensor 2 out of
XT current sensor 2 is out of range. Yes
range (XT systems only)
Water temp sensor out of
Water temp sensor is out of range. Yes
range (HPS systems only)
High inlet water temp The inlet water is above 110 °F (43 °C). The pump is shut off and the RO flush valve is opened until the
Yes
(HPS systems only) supply water is below 110 °F (43 °C).
Low inlet water temp The inlet water temperature is below 40 °F (4 °C). The pump is shut off and the RO flush valve is
Yes
(HPS systems only) opened until supply water is above 40 °F (4 °C).

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 51

 OPERATION

Alarms screen

Table 49-1:
Alarms menu (continued)
Does alarm
Alarm label Description
auto-clear?
High inlet pressure
The inlet water pressure is above 60 psi (415 kPa) Yes
(HPS systems only)
Low inlet pressure
The inlet water pressure is below 25 psi (170 kPa) Yes
(HPS systems only)
High pump pressure
Pump pressure is above 1350 psi (9.3 Mpa). No
(HPS systems only)
Low pump pressure
Pump pressure is below 400 psi (60 kPa). No
(HPS systems only)
VFD fault
Displays VFD fault condition. No
(HPS systems only)
Check floats
Float malfunction No
(LMH systems only)
Low inlet pressure
Water pressure at RO inlet is less than 10 psi. Yes
(LMH systems only)
High storage pressure
Tank storage pressure has exceeded 60 psi. Yes
(LMH systems only)
Storage pressure sensor
Pressure sensor reading is out of range. Yes
(LMH systems only)
Excessive TDS TDS measurement during RO production exceeds the TDS set point.
No
(LMH systems only) The system will continue to operate but the membranes may need to be replaced.
Incoming air temperature
Air temperature upstream of wetted media is out of range Yes
sensor (WMS systems only)
Stage 1 temperature sensor
Air temperature downstream of Stage 1 is out of range Yes
(WMS systems only)
Stage 2 temperature sensor
Air temperature downstream of Stage 2 is out of range Yes
(WMS systems only)
Stage 3 temperature sensor
Air temperature downstream of Stage 3 is out of range Yes
(WMS systems only)
Notes:
• See the “Troubleshooting” section, beginning on Page 91, for alarm possible causes and recommended actions.
• The Alarms Log displays alarm name, date and time of occurrence, plus ”Active,” ”Cleared” or ”Auto-cleared.”
• Active alarms display first in the Alarms Log, followed by cleared alarms (auto-cleared and/or manually-cleared) listed in order of occurrence.
• The Alarms Log displays maximum 30 alarms. Cleared alarms leave the log first.
• If an alarm event occurs and is not manually cleared or auto-cleared during unit operation, the alarm will remain until there is demand and the unit
is running.

52 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Status LED
The Vapor-logic control board includes a diagnostic Status LED that shows multiple humidifier control conditions. The
Status LED blinks in a 3-stage cycle over approximately four seconds. The Status LED is always “blinking”. It will be
easy to see that the board is powered and operating because, at a minimum, it is running the Status LED.

The blinking will be in a 3-stage cycle starting from being dark with the LED brightness illuminating up to the first stage
of indication.

Timing of the 3-stage cycle will be over approximately four seconds.

See "LED indicators" on page 54.

FIRST BLINK: FAULTS

A yellow first LED blink indicates there is one (or more) of four conditions present that will prevent the humidifier from
operating. These conditions can be viewed as a message through the Vapor-logic display:

1. The interlock switch on cabinet or tank is open (connected at ISW input on control board).
2. There is no airflow.
3. The duct humidity high limit has been exceeded.
4. The Main Enable input is open (P20 input on control board).
A red Status LED blink indicates there is an active fault preventing the unit from operating. These conditions can be
viewed as alarms through the Vapor-logic display.

If the first Status LED blink is blue, the unit is set to Standby or Test mode. Unit must be set to Auto Mode to enable
operation. The Mode can be set through the Keypad, or through an associated building automation system (BAS).

SECOND BLINK: COMMUNICATION STATUS

For single-tank installations, green or red indicates communications status to the associated Keypad/display.

If the humidifier is part of a multi-tank system, Green indicates communications is occurring between the controller and
other controllers and/or the Keypad/display. Red indicates there is no communications occurring. If the Status LED is
red, check the communications wiring between the main and other secondary units.

THIRD BLINK: HUMIDIFICATION DEMAND

Without humidification demand the humidifier will not run, and the third blink in the Status LED sequence will be blue.
Demand is created through a connected humidistat, humidity transmitter, or through an external source such as building
automation system (BAS). When there is a call for humidification (demand), the third Status LED blink sequence will be
green.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 53

 OPERATION

Status LED

Table 54-1:
LED indicators
First Blink Second Blink Third Blink
LED Indicator
Faults Communications status Demand/call for humidification

Keypad/display is attached and

Green Auto mode: no faults Humidification demand is present
working
Auto mode: active message
Yellow — —
preventing unit from running
Auto mode: active fault preventing Keypad/display is not
Red —
unit from running communicating with controller
Standby or test mode: unit will not
Blue — No humidification demand present
run

54 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

PID tuning
When your system has a humidity or dew point transmitter, you can adjust Setup menu
The Setup menu is where system parameters
and control the set point through the keypad/display or Web interface using a can be changed. This menu is used primarily
proportional, integral, and derivative (PID) control loop. during initial installation, but can also be
used for making changes or adjustments as
needed during operation. Note that while all
IMPROVES HUMIDIFIER RESPONSE TIME
parameters can be changed, many changes
With a PID loop, you can tune your system for maximum performance using the also require a corresponding hardware
proportional (Kp), integral (Ki), and derivative (Kd) gain terms. change. Vapor-logic firmware will warn you of
this during the setup process.

Kp = Proportional gain factor See Setup, beginning on Page 28, for more
Ki = Integral gain factor information about the Setup menu.
Kd = Derivative gain factor

These gain factors work in the following way: The overall demand in a PID
system is made up of three distinct parts—the proportional, the integral, and
the derivative. Each of these parts is calculated and then multiplied by its
corresponding gain factor. These gain factors are the setup variables you have
access to from the Setup menu. By making a gain factor larger, you increase
its overall influence on system demand. Once each PID component is multiplied
by its gain factor, all three terms are added together to determine the overall
demand percentage.

THE PROPORTIONAL TERM

The proportional term is the difference between the RH set point and the
actual humidity multiplied by the proportional gain. For example, with a Kp
of 80 and the actual humidity 5% below the RH set point, the proportional
contribution to the demand is:
5 × 80 × 0.085 = 33% (the 0.085 is an internal scalar used to increase the
usable span of Kp).

There is a problem with using only proportional gain to control the RH. In
almost all applications there is some constant load on the humidifier just
as there is a constant load on heating equipment. If the proportional term
is all that is used, the actual humidity must be less than the set point for the
humidifier to be on.

What happens is the humidifier finds a happy medium where the actual
humidity is something less than the set point, which allows the humidifier to
continue to run. This difference between the set point and the actual running
humidity level is called the droop. This droop can be corrected using the next
term, the integral.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 55

 OPERATION

PID tuning
THE INTEGRAL TERM
The integral term is an accumulation of RH error over time multiplied by
the integral gain. Every 1/10 second when the demand is updated, the
instantaneous RH error (RH set point – actual RH) is added to a temporary
variable that accumulates the error. This accumulated error is multiplied by the
integral gain to create the integral term. The integral gain affects how fast the
humidifier corrects a droop condition. The higher the integral gain (Ki), the
faster the reaction. (An integral gain of zero disables this variable and allows
the unit to run on the proportional term only.)

With an integral gain term greater than zero and an actual humidity below set
point, the demand increases slightly with each update. If the actual humidity
is above set point, the demand decreases slightly. The amount it increases
or decreases depends on the magnitude of the RH error and the integral
gain value. The closer you are to the set point, the smaller the addition or
subtraction.

When looking at this control scheme, an interesting pattern occurs. The total
demand signal for the humidifier is the sum of the proportional part, the
integral part, and the derivative part. As the actual humidity approaches the
set point, the integral portion makes up the majority of the demand, and the
proportional part makes up very little. Once the set point is reached and the
unit stabilizes, the entire demand is made up of the integral part because the
proportional part is zero.

If the actual humidity goes over the set point, the integral term starts to
decrease. In addition, the proportional term becomes negative and actually
starts to subtract from the total system demand. These two terms work in
conjunction with each other to bring the humidifier back to set point.

56 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

PID tuning
THE DERIVATIVE TERM
The derivative term is the measured change in error over time multiplied by the
derivative gain (differentiating error with respect to time).

If the actual measured RH is below set point and is rising, the derivative term
subtracts from the demand in anticipation of the approaching set point.

If the actual measured RH is below set point and is falling, the derivative term
adds to the demand in anticipation of the need to get the demand up faster
and start climbing toward set point.

If the actual measured RH is above set point and falling, the derivative term
adds to the overall demand in anticipation of the approaching set point.
It generally is used to increase damping and, in some cases, improves the
stability of the system.

However, in the majority of control situations, the derivative term is not needed
and is simply set to zero. The proportional term and integral term provide tight,
accurate control without the addition of the derivative term.

PID BAND
The last user-controlled term in the PID equation is the PID band. The PID band
defines the range of measured RH values (°F/°C for dew point control) where
the PID loop is in operation. The PID loop is in operation when the measured
RH is in the range of (RH set point – PID band) to (RH set point + PID band). If
the measured RH is below the PID band, the PID calculations are suspended
and the demand is set to 100%. Conversely, if the measured RH is above the
PID band, the demand is set to 0%.

For example, if starting with an RH set point of 35% and a PID band of 10%,
the PID loop operates when the actual humidity is in the range of 25% to 45%.
If the actual humidity is lower than 25%, the humidifier is full on. If the actual
humidity is above 45%, the humidifier demand is 0%. The PID band aids in
speeding the response time of the system. It allows the RH to get somewhat
close to the set point and then lets the PID loop precisely control the RH when it
is within the PID band. The default value for the PID band is 10%.

Large spaces where the humidification system influences the RH very

slowly typically benefit from a smaller PID band. Small spaces where the
humidification system can quickly influence the RH typically benefit from a
larger PID band. Rarely should it be set to less than 10%.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 57

 OPERATION

PID tuning
PID SETUP TIPS
A large PID band (10% to 20%) yields tighter and more stable control with
longer response times. A small PID band produces quicker response times, but
control may become unstable if the RH regularly goes outside the band.

As a rule, start with a PID band of 10%. When the humidifier is operating at
steady state, make sure the RH does not go outside the PID band. The intent of
the PID band is to quickly get the RH into a controllable range. To increase or
decrease the effect of the proportional term on system performance, adjust the
proportional gain (Kp).

However, for the majority of systems, the factory default setting of 80 is

sufficient. Generally speaking, a large integral gain (Ki) quickens the system
response but may cause it to oscillate and become unstable. A small integral
gain yields tighter, more stable control at the expense of a long response time.

These principles can be applied in the following examples: If a system

eventually reaches the desired RH level but takes a long time to do so without
overshooting the set point, faster response can be achieved by increasing the
integral gain. If the measured RH oscillates above and below the set point
numerous times before finally reaching set point, decrease the integral gain.

Typically, if a large adjustment is made to the integral gain, better response

is achieved by decreasing the magnitude of the change. Then, modify the
proportional gain slightly in the same direction the integral gain was changed.
RH history data, available for download from the Diagnostics menu, can aid
when doing PID loop tuning.

58 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Water level control

PROBE SYSTEM XT humidifiers do not use conductivity probes
Humidifiers with tap/softened fill water use conductivity probes to measure and for water level control. See “Electrode steam
humidifiers” on Page 61.
control the water level for optimum operating efficiency. Water conductivity
must be at least 30 µS/cm for the probe system to operate. The three-probe
system is monitored by the Vapor‑logic board, which performs all the necessary
logic and timing functions to provide total water level control and safety
CAUTION
shutdown.
Chloride corrosion
Vapor‑logic automatically maintains the water level between the top and Damage caused by chloride corrosion
is not covered by your DriSteem
middle probes (see Figure 59-1). When the water level falls below the
warranty.
middle probe, the fill valve opens until the water level rises to the top probe.
Chloride corrosion can result from a
Water must remain in contact with the probe surface for three seconds for
variety of causes, including, but not
Vapor‑logic to determine that the water is at the probe’s level. limited to

Conversely, water must stay out of contact with the probe surface for three • Improper water deionization
seconds for Vapor‑logic to determine that the water is below the probe’s level. processes

This three-second delay ensures that turbulence does not cause an incorrect • Improper water softening processes
level reading. • Humidifier’s supply water

Each time the fill valve energizes, the Vapor‑logic system tests the probe system.
If the signal from the probe assembly begins to deteriorate, the “Clean probes”
message appears in the Messages Log. Once the probe system reaches its FIGURE 59-1: WATER LEVEL CONTROL
maximum usable life, the humidifier shuts down and the “Faulty water probe” FOR TAP/SOFTENED WATER HUMIDIFIER
alarm appears.

An adjustable skim time allows for an extended skim period (0 to 120 seconds)
to reduce mineral accumulation. When skimming, the fill valve remains VLC-OM-030

Fill valve closes when water

energized after the water level reaches the top probe for the amount of time
level rises to this probe.
specified by the skim duration. The skim duration is adjustable in one‑second
intervals through the Setup menu. Fill valve opens when water
level is below this probe.
If the water level falls below the low-water cutoff probe, heating outputs are
disabled; this provides low-water protection for the heating outputs. Low-water cutoff. Power to
heaters is cut if water level
drops below this probe.
See “Chloride corrosion” Caution at right.
Humidifiers using tap or softened water control
water levels electronically using a three-rod
probe. The controller responds with the above
actions when the water level reaches each rod.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 59

 OPERATION

Water level control

FLOAT VALVE SYSTEM XT humidifiers do not use the float valve system
for water level control. See “Electrode steam
DI/RO water systems (except for steam injection) use a float valve system to
humidifiers” on Page 61.
control water levels for optimum operating efficiency. DI/RO systems are used
where water/steam purity is important, where demineralized water is needed
to improve performance or lessen maintenance requirements, or where a water CAUTION
source has minimal or no conductivity, thus requiring a float rather than a Chloride corrosion
probe to sense water levels. Damage caused by chloride corrosion
is not covered by your DriSteem
The float valve system consists of a fill float and a low water cutoff float. warranty.
Chloride corrosion can result from a
The fill float regulates how much water is added to the tank via a float ball,
variety of causes, including, but not
float arm, and mechanical valve. The valve is adjusted to fill the evaporating limited to
chamber within ¼" (6 mm) of the overflow port allowing heated, and therefore
• Improper water deionization
expanded, water at startup to fill the external P-trap. processes
• Improper water softening processes
The low water cutoff float has an electrical switch that closes when a ready • Humidifier’s supply water
water condition is reached. This float switch provides low water protection for
the heating outputs. If the water falls below the float, the heating outputs are
disabled.

See “Chloride corrosion” Caution at right.

FIGURE 60-1: FIGURE 60-2:

WATER LEVEL CONTROL FOR DI/RO WATER SYSTEM LOW WATER CUTOFF SWITCH FOR DI/RO WATER SYSTEMS

Supply water connection

A zero mark on top of the float indicates proper float

placement on stem. Switch is normally open when
Float ball
float ball is at its lowest point on the stem.

Float rod

OM-3009
OM-7396
Humidifiers using DI/RO water control water levels using a float valve
and low-water cutoff switch.

60 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Water level control

ELECTRODE STEAM HUMIDIFIERS Supply water
In electrode steam humidifiers (see Figure 61-1), steam output is directly Electrode steam humidifiers use tap or softened
related to the resistance of the water in the steam cylinder and, therefore, the supply water. Demineralized, deionized, and
reverse-osmosis water are not conductive
conductivity of the water between the electrodes. enough for electrode steam humidifiers.

Recommended supply water conductivity for XT humidifiers is 350 to 1250 μS/cm.

Higher water levels cover more electrode surface and result in more steam;
lower water levels cover less electrode surface and result in less steam. Since
water conductivity and water level both correlate to steam output, DriSteem
electrode humidifiers employ an algorithm that monitors conductivity and
manages drain and fill events to optimize humidifier performance and provide
proper steam output.

As the water in the cylinder boils into steam, the concentration of conductive
ions increases until it reaches a threshold that triggers a drain and fill event.
This rids the cylinder of highly conductive water and replaces it with less
conductive fill water. The more conductive the fill water and the higher the
demand, the more quickly the threshold is reached, and the more frequently the
cylinder automatically drains and fills to stay within the parameters for proper
steam output.

To prevent overfilling of the cylinder, filling stops if the water level reaches the
high water sensor.

FIGURE 61-1:
WATER LEVEL CONTROL FOR ELECTRODE STEAM HUMIDIFIER

Fill cup

High water sensor

Overflow Electrodes

Water

OM-7580
Cylinder drain

Water fill line connection

Overflow to drain
(under cabinet)

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 61

 OPERATION

Options and features

When a duct high limit option is ordered, DriSteem provides either a duct
high limit switch or a duct high limit humidity transmitter (4 to 20 mA output,
0 to 100% RH range) for duct mounting.

DUCT HIGH LIMIT SWITCH OPTION

The duct high limit switch prevents duct saturation by turning off the humidifier
when reaching the device set point. When this occurs, a “Duct HL trip”
message appears in the Messages Log and autoclears when duct RH drops
below the duct high limit set point.

MODULATING HIGH LIMIT TRANSMITTER OPTION

The modulating high limit transmitter operates in conjunction with the room/
duct controlling transmitter or demand signal through the Vapor‑logic control
system to prevent excess humidification in the duct. Vapor‑logic starts lowering
the humidifier output when the duct relative humidity is within a user-defined
percentage (default is 5%) of the duct high limit set point. This value is called
the duct high limit span and is defined during Setup.

When duct relative humidity enters this range, a “Duct HL span” message
appears in the Messages Log and the Message label lights on the keypad/
display. If necessary, the reduction of the humidifier output continues until
maximum high limit set point is reached, shutting off the humidifier completely.
If this occurs, a “Duct HL trip” message appears in the Messages Log.

When the high relative humidity starts to decrease in the duct, Vapor‑logic
slowly starts to increase steam production. When the duct relative humidity
decreases to greater than the defined percentage below the duct high limit set
point, the control transmitter or signal by others demand signal is restored as
the primary controller, returning the control system to normal operation, and
the messages in the Messages Log automatically clear.

TEMPERATURE COMPENSATION CONTROL OPTION

Note: This option is not applicable for XT humidifiers.

When selected as an option, DriSteem provides a temperature compensation

transmitter. The temperature compensation transmitter continually monitors
interior window glass temperature and transmits this temperature to
Vapor‑logic.

Vapor‑logic assumes a 70 °F (21 °C) room temperature and uses the glass
temperature and the RH in the space being controlled to calculate the dew
point (°F or °C) for the space.

62 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Options and features

If the window temperature falls below the dew point, Vapor‑logic automatically
decreases the RH set point so moisture does not form on windows. The Home
screen displays the modified RH set point, and an asterisk (*) appears next
to the modified RH set point, denoting that temperature compensation has
taken control of the RH set point. The “Temp comp on” message appears in
the Messages Log and the Message softkey label becomes highlighted. When
the interior window glass temperature rises above the dew point, Vapor‑logic
restores system control to the normal RH set point for the space, and the “Temp
comp on” message automatically clears.

The temperature compensation control option is available only when the

system is equipped with an RH transmitter. It is not available when a remote
humidistat, dew point transmitter, or building automation system is used to
control the humidifier.

The transmitter provided with Vapor‑logic is calibrated for –20 °F to 160 °F

(–29 °C to 71 °C) with output from 4 to 20 mA. For example, a temperature
reading of 70 °F (21 °C) should produce a measurement of 12 mA. You can
calibrate the sensor by adjusting the offset in the auxiliary temp sensor section
of the Setup menu.

AUXILIARY TEMPERATURE SENSOR OPTION

Note: This option is not applicable for XT humidifiers.

When selected as an option, DriSteem provides a temperature sensor for

monitoring temperature in a duct or space. Temperature from this sensor can
be viewed from the Status menu (“Aux temperature”). Temperature history data
is logged to the data log and can be downloaded from the download data
section of the Diagnostics menu.

TANK PREHEAT FEATURE

The tank preheat feature heats the water in the tank to near boiling to allow a
rapid response to a demand signal. If the tank is cold when a small demand
signal is present, the Vapor‑logic controller overrides the demand signal and
heats until the tank temperature increases to the boiling point. At this point,
control is returned to the original demand signal.

Preheating allows the system to respond quickly to small demand requests.

When preheating, the word “Heating” appears on the Home screen.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 63

 OPERATION

Options and features

AQUASTAT SET POINT FEATURE
Note: This feature is not applicable for XT humidifiers.

The aquastat set point is the minimum tank temperature the Vapor‑logic
controller maintains when there is no call for humidity or when safety circuits
are not satisfied (e.g., high limit or airflow proving switch). The aquastat set
point is adjusted through the water management section of the Setup menu.
This feature shortens the tank preheat time, providing a rapid response to a
call for humidity.

For example, if the aquastat is set at 180 °F (82 °C) when a call for humidity
occurs, the tank only needs to warm up 32 °F (18 °C) to reach the boiling
point. However, if the aquastat is at its minimum default setting of 40 °F (4 °C)
and the tank is in an average-temperature occupied room, when a call for
humidity occurs, the tank needs to warm up from room temperature to the
boiling point before producing steam. When an aquastat call is heating the
tank, the word “Heating” appears on the Home screen. Aquastat heating will
occur with high-limit and airflow alarm conditions.

FREEZE PROTECTION
Freeze protection is similar to aquastat operation with some exceptions. The
freeze protect set point is fixed at 40 °F (4 °C). Its purpose is to prevent the
tank from freezing in cold environments. Unlike aquastat, if a condition exists
that prevents the heaters, burners, and valves from firing (such as an alarm, an
external interlock switch is open, or the humidifier is in Standby mode), instead
of remaining idle, the controller switches to manual drain run mode and the
tank drains to prevent freezing. Change mode to Auto to resume operation.

When the tank is heating to prevent freezing, the word “Heating” appears
on the Home screen. When the tank is draining or has drained to prevent
freezing, the “Freeze drain” message appears in the Messages Log and the
Message softkey label becomes highlighted.

FAN-BASED DISPERSION OPERATION

If your humidifier is equipped with a Space Distribution Unit (SDU) or an
Area‑type fan, it is enabled after the Vapor‑logic controller receives a call for
humidity and the tank water is approaching boiling temperature.

When the humidifier no longer receives a call for humidity, it stops heating and
the SDU or Area‑type fan continues to run for the time delay period (as defined
in the fan-based dispersion section Setup menu).

64 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Options and features

SENSOR OFFSETS Drain algorithm for XT humidifiers
All external transmitters shipped with Vapor‑logic can be field calibrated XT humidifiers employ a drain algorithm that
from the Setup menu. For example, if the system is equipped with an RH is written specifically for how electrode steam
humidifiers function. See “Electrode steam
transmitter, there is an RH offset setting. humidifiers” on Page 61.

The factory default for all transmitter offset settings is zero. The sensors that
have this adjustment capability are the humidity, duct high limit, temperature
compensation, and dew point transmitters.

AUTOMATIC DRAIN SEQUENCE, TAP/SOFTENED WATER

(See note at right for XT humidifiers.)

When configured to run a tap/softened water humidifier with an automatic drain valve, Vapor‑logic
uses an automatic drain sequence (ADS) to reduce mineral accumulation in the tank and drain line,
which decreases tank maintenance.

The automatic drain sequence starts by opening the drain valve to empty the tank. When the drain
duration ends, the fill and drain valves remain open to flush the tank. When the flush duration ends,
the automatic drain sequence is complete and the humidifier resumes normal operation. The default
drain and flush durations are model-specific and can be adjusted in the water management section
of the Setup menu.

Automatic draining and flushing parameters are defined in the water management section of the
Setup menu:

• First, automatic draining and flushing must be enabled.

• Second, the amount of water converted to steam before an automatic drain sequence begins
must be defined (Usage). Defaults for this value are model-specific and are calculated based on
operating 200 hours at 100% capacity. Go to the Setup menu to view or change this setting for
your humidifier.
• Third, days of the week when the automatic drain sequence can occur must be defined. This
means that once the Usage requirement is met, the automatic drain sequence can occur on the
first allowed day (allowed days default is all days).
• Last, time of day when the automatic drain sequence occurs must be defined (default value is
midnight).

For example, if you use factory default settings for the automatic drain sequence, the first automatic
drain sequence will occur at midnight on any day of the week once the model-specific usage
requirement has been met. If you want to change these settings, go to the water management
section of the Setup menu.

Note that the automatic drain sequence is designed for a tap/softened water humidifier with
electric drain and fill valves. Humidifiers using DI/RO water do not require automatic draining and
flushing, but this feature can be enabled if the humidifier has electric drain and fill valves.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 65

 OPERATION

Options and features

DRAINING WHEN USING SOFTENED WATER
When using softened water, draining occurs for a one-minute duration after
a period of time based on 1000 hours of 100% operation to remove residue
from the drain valve mechanism. End-of-season draining occurs as described
below.

SKIM TIMER
With a tap/softened water configuration, the Vapor‑logic controller has a skim
timer. This timer is activated at the end of each fill cycle. The timer keeps the
fill valve open (for a user‑determined amount of time after the tank has filled) to
skim minerals off the water surface. The skim time is adjusted through the Setup
menu.

END-OF-SEASON DRAIN
If there is no call for humidity for a user-defined time period, the humidifier
performs an end-of-season (EOS) drain where the drain valve remains open for
ten hours to allow the tank to drain and then closes. If the humidifier receives
a call for humidity after the ten-hour end-of-season drain-down period has
begun, the controller stops the end-of-season draining, the tank refills, and the
humidifier resumes normal operation. The user-defined inactivity time period
(idle time) is defined in the end-of-season drain section of the Setup menu. This
option is available only on units equipped with electric drain and fill valves.

SERVICE INTERVAL
The Vapor‑logic controller tracks the amount of water converted to steam by the
humidifier and the number of hours the humidifier runs. When the amount of
steam or hours of run time exceeds the user-defined service interval (pounds,
kilograms, or hours, adjusted in the Setup menu), “Service unit” appears in the
Messages Log.

The humidifier continues to operate after the message appears. The message
notifies the user that the service interval was reached and the humidifier should
be cleaned. The message remains in the Messages Log until it is cleared or
until the Messages Log adds 10 new messages (the maximum number of
messages the log holds).

66 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Options and features

SETTING DATE AND TIME
The Vapor‑logic controller contains a real-time clock that is used for several
features including the drain and flush sequence and alarm logging. If you need
to reset the date or time, go to the Setup menu.

Note: Verify the date and time settings after every firmware upgrade.

BATTERY BACKUP, NONVOLATILE MEMORY

If there is a power outage, date and time settings will be saved. Alarms, unit
configuration, and usage timers will remain in nonvolatile memory indefinitely.

SECURITY/PASSWORD
To control who can change Vapor-logic settings, enable the security function
and define a password in the Setup menu. Enter four digits, numbers only,
and define the time-out period (minutes of inactivity before Vapor-logic reverts
to read-only mode). The Web interface and the keypad/display can have
separate passwords.

Important: Write down the password and keep in a secure location.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 67

 OPERATION

Options and features

DOWNLOADING HISTORICAL DATA Note: D
 ata is saved to nonvolatile memory
every 60 minutes. If unit power is lost,
Vapor-logic acquires data at one-minute intervals and retains it for seven rolling
up to 60 minutes of data could be lost.
days. These data, available for download and sorting, contain the details
shown in Table 68-1.

Go to the Download data section of the Diagnostic screen for download

options.

Table 68-1:
Sample of data log downloaded and sorted
SpaceRH or Aux Temp Tank Temp Lbs Output Alarm/ Alarm/Msg Current Config: Factory Config:
Time BTU’s used
Demand (°F) (°F) steam (%) Msg Status xx##xx#x###xx xx##xx#x###xx

1/26/10 9:36 AM 23 0 212 567019018 421066 23

1/26/10 9:37 AM 23 0 212 567021350 421068 23

1/26/10 9:38 AM 23 0 211 567023681 421070 23

low water Auto cleared
1/26/10 9:39 AM
cutout message
1/26/10 9:40 AM 23 0 210 567028344 421073 23 — —

1/26/10 9:41 AM 23 0 211 567030677 421075 23

1/26/10 9:42 AM 23 0 212 567033008 421077 23

1/26/10 9:43 AM 23 0 212 567035339 421079 23

Auto cleared
1/26/10 9:44 AM Unit Start
message

To sort data (as shown above) with alarms and messages listed in the order
they occurred:

1. Import the data into a spreadsheet program, such as Microsoft Excel.

2. Set the Time column to be displayed in the date-time format.
3. Sort all rows by “Time” in ascending order.

BACKING UP AND RESTORING SETTINGS

Vapor-logic data can be backed up to and restored from a USB flash drive.
The backup file contains all information relative to the humidifier, including
firmware, user settings, model number, serial number, and the configuration
string.

Backup files use the serial number in the backup file name so that the file is
easily matched to a particular humidifier.

68 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Firmware updates
BACKING UP AND RESTORING SETTINGS
To create a backup file:

1. Insert a USB flash drive into the USB port on the Vapor-logic board.
2. Go to Diagnostics/USB backup-restore/Back up settings
3. Select Yes. The display will prompt you when backup is complete.

To restore from a backup file:

1. Insert a USB flash drive with that humidifier’s backup file into the USB port
on the Vapor-logic board.
2. Go to Diagnostics/USB backup-restore/Restore settings.
3. Select Yes. Note that the serial number of the humidifier and backup file
must match to complete the restore process.

DOWNLOADING FIRMWARE UPDATES

The Vapor-logic controller can be field upgraded to the latest firmware version
via the USB port on the Vapor-logic board. Firmware updates are available at
no charge on the DriSteem website.

To update your Vapor-logic controller to the latest firmware version, perform the
following procedure:

1. Navigate to www.dristeem.com.
2. Go to Support & Literature on the site navigation menu.
3. Select Technical Support.
4. Click on firmware updates.
5. Plug a reliable USB flash drive into a USB port on your computer, and
prepare the flash drive as follows:
a) Move or delete all files from the drive.
b) Make sure it has at least 16 MB of free space.
c) Make sure it is not partitioned into multiple drives.
6. Navigate to Vapor-logic6 and click version download link.
7. Perform the procedure in Table 70-1.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 69

 OPERATION

Firmware updates

Table 70-1:
Downloading Vapor-logic firmware updates
1. Click the link shown to the right on the Vapor-logic firmware updates page of
www.dristeem.com.

If a security window appears, click the Save button.

Notes:
• Your browser and operating system might be set up differently, the screenshots
are provided as a general road map.

• Chrome or Firefox browers are recommended. Microsoft Edge will block the
executable file from downloading.

2. When prompted for a save location, choose your downloads.

3. Click the Save button.

4. In your downloads folder, double-click the new vl6_update.exe file or click the
executable directly from the browser download button.

5. If a Security Warning appears, click the Run button.

A WinZip Self-Extractor window appears.

Notes:
• If Microsoft Defender Smartscreen prevents the app from starting, click More
Info and then Run.

• If Microsoft Edge must be used, click for more options to choose to keep the file
and the Show More to choose Keep.

Continued

70 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Firmware updates

Table 70-1:
Downloading Vapor-logic firmware updates (continued)
6. Click the Browse button in the WinZip Self-Extractor window, and select your
USB flash drive as the target location.

7. Click the Unzip button in the WinZip Self-Extractor window.

A WinZip window opens to confirm that the firmware update has been
unzipped.

8. Click the OK button.

9. Click the Close button to close the WinZip Self-Extractor window.

10. Open your USB flash drive. Confirm that it contains a folder named
vl6_update_xx.xx.xx (where x represents the version number) and that it has
today’s timestamp.

11. Remove the USB flash drive from your computer.

12. Proceed to “Installing firmware updates” on Page 72.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 71

 OPERATION

Firmware updates
INSTALLING FIRMWARE UPDATES
1. Place the humidifier system in Standby mode. Disconnect the display, WARNING
Ethernet, multi-tank and Fieldbus wires.
2. IMPORTANT: To prevent static damage to the USB flash drive and Electric shock hazard
All circuits must be energized for this
controller, ground yourself by briefly touching the humidifier’s electrical
firmware update procedure. Contact
subpanel before touching any part of the controller board or doing Step 3. with energized circuits can cause
See the Warning. severe personal injury or death as a
3. With the board powered, insert the USB flash drive loaded with the result of electric shock.

unzipped firmware update folder into the Vapor-logic board USB port. To prevent shock when grounding
to the electrical subpanel, touch the
CAUTION subpanel along its edge, away from
Do not remove USB flash drive or cycle power early wires and components.
During Steps 4 and 5, do not remove the USB flash drive or cycle the power until
the signal occurs as explained in Step 5.

4. The update process begins immediately and takes up to 1 minute. Wait

for the relay on the Vapor-logic board to begin clicking continuously. The
water probe LEDs on the board will blink during the update process.
5. When the relay on the Vapor-logic board begins to click continuously,
remove the USB flash drive from the Vapor-logic board USB port.
 When the USB flash drive is removed, the Vapor-logic controller and
display reboot with the updated firmware.

Note: Some USB sticks will not click. If this happens, confirm the USB stick
has been inserted at least one minute and the water probe LEDs are at at a
steady state.

6. Verify the update by checking the Vapor-logic firmware version as follows:

a) Select Diagnostics in the keypad/display Main menu.
b) Select Humidifier info.
c) Scroll down to Firmware version.
The firmware version displayed should match the version number of the
vl6_update xx.xx.xx folder on the USB flash drive (where x represents the
version number).

7. Verify humidifier operation, and return it to service.

Not all USB drives perform equally. If a USB flash drive fails to update the
Vapor-logic firmware, perform the procedure with a USB flash drive of a
different brand and size.

72 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Test outputs and test run

TEST OUTPUTS
When completing an installation or repair, cycle all outputs, such as fill valve,
drain valve, etc., to verify operation. Go to the test outputs section of the
Diagnostics menu and scroll through each connected output to verify operation.
During testing, the humidifier mode changes to Standby and the tank status
changes to Test.

TEST RUN
Vapor-logic has a test run capability to confirm system functionality. This
capability allows a technician to simulate a demand for steam production
when there isn’t one (such as when performing routine maintenance). To
confirm functionality, go to the test run section of the Diagnostics menu. Set
system demand percent and set test run time duration. During testing, the
humidifier mode changes to Standby and the tank status changes to Test.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 73

 OPERATION

Modbus, BACnet, LonTalk interoperability

Vapor-logic comes standard with Modbus, or with BACnet or LonTalk if FIGURE 74-1: LON PROTOCESSOR
ordered. Vapor-logic can connect to building automation systems using these MODULE INSTALLATION

protocols. Variables are defined in the tables on the following pages. 1. Remove LON ProtoCessor
module from box.
Note: F or retrofit BACnet or LonTalk installations, contact your local DriSteem
representative to purchase a BACnet or LonTalk upgrade.

CONNECTIONS
1. If connecting to a Modbus or BACnet MS/TP system, connect Modbus or
BACnet system wiring to terminal P7 on the Vapor-logic board (positive to
positive, negative to negative).
If connecting to a BACnet/IP system, connect BACnet system wiring to the 2. Insert LON ProtoCessor module into
Ethernet connection. pins on Vapor-logic board.

2. If connecting to a LonTalk system, connect the LON ProtoCessor module

per Step 3 in Figure 74-1. Bottom of LON
ProtoCessor
3. Disconnect power to the Vapor-logic board, wait 5 seconds, and reconnect module
power.
4. Set up communication with Vapor-logic using your Modbus, BACnet, or
LonTalk network manager, referencing Table 75-1.

INSTALLING LONTALK AS A RETROFIT

1. Turn off power to the unit.
2. Touch the unit’s bare metal frame before handling the LON ProtoCessor
module, and hold onto frame while handling the module.
3. While handling the module, hold it by the edge. Avoid touching the
components or circuit board.
4. Plug LON ProtoCessor module into mounting pins (as shown in Figure
74-1) with LonTalk connector at the edge of the board. Make sure all pins Vapor-logic board
are seated in the connector.
5. Connect LonTalk system wires to LON ProtoCessor module as shown in
Step 3 at right. 3. Connect wiring from LonTalk system to
LON ProtoCessor module on
6. Turn on power to the unit. Vapor-logic board.

7. Using either the keypad/display or Web interface go to the

Communications section of the Setup menu to enable LonTalk
communication.
8. Set up communication with Vapor-logic using your LonTalk network
manager, referencing Table 75-1.

INSTALLING BACNET AS A RETROFIT

1. Using the keypad/display or Web interface, go to the Setup menu, and Connect LonTalk
system wires to LON
select Tank Setup, then Communication, then BACnet, and press Enter. ProtoCessor module here.
2. Enter the code provided when you purchased the BACnet upgrade. The
NOTE: Orient the LON ProtoCessor module as
activation code is matched to the unit’s serial number. shown, with wire connectors end at the side of
3. Select the BACnet communication channel in the BACnet Setup menu. the Vapor-logic board.

4. Cycle the power to activate BACnet.

74 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
 OPERATION

Modbus, BACnet, LonTalk interoperability

Table 75-1:
Interoperability variable and object names
Read Only BACnet Units Range
Modbus
Variable name and (RO) or Object LonTalk variable
register Description
BACnet object name Read Write Type and names**
number* I-P units SI units I-P units SI units
(RW) Instance
Read-only analog variables
Relative humidity content
IR-1
Space_RH RO AI-01 nvoSpaceRH of the air in the space % % 0 to 100 0 to 100
30001
being humidified.
Dew point of the air
IR-2
Space_dew_point RO AI-02 nvoSpaceDewPoint in the space being ºF ºC 20 to 80 -6 to 26
30002
humidified.
IR-3 Relative humidity content of
Duct_RH RO AI-03 nvoDuctRH % % 0 to 100 0 to 100
30003 air in the duct.
IR-4 Steam demand in pounds 0 to 0 to
Steam_demand_mass RO AI-04 nvoSteamDmndMass lbs/hr kg/h
30004 or kilograms per hour. 100,000 100,000
Steam demand as
IR-5
Steam_demand_percent RO AI-05 nvoSteamDemandP a percentage of the % % 0 to 100 0 to 100
30005
humidifier’s total capacity.
IR-6 Temperature of auxiliary
Aux_temp RO AI-06 nvoAuxTemp ºF ºC -20 to 160 -29 to 170
30006 temperature sensor.
Temperature of the
IR-7 -240 to
Water_temp RO AI-07 nvoTankTemp water in the humidifier’s ºF ºC -151 to 129
30007 265
evaporating chamber.
Estimated amount of
IR-8 steam the humidifier is 0 to 0 to
Steam_output_mass RO AV-1 nvoSteamOutMass lbs/hr kg/h
30008 producing in pounds or 100,000 100,000
kilograms per hour.
Estimated amount of
steam the humidifier
IR-9 is producing as a
Steam_output_percent RO AV-2 nvoSteamOutputP % & 0 to 100 0 to 100
30009 percentage of the
humidifier’s total
capacity.
Pounds or kilograms
of water remaining to
IR-10 be converted to steam 100 100 0 to 0 to
Water_until_ADS RO AV-3 nvoWaterUntilADS
30010 before the next automatic lbs kg 2,200,000 1,000,000
drain sequence (ADS)
cycle.
Pounds or kilograms of
IR-11 water remaining to be 100 100 0 to 0 to
Water_until_service RO AV-4 nvoWaterTilSrvc
30011 converted to steam before lbs kg 2,200,000 1,000,000
next service cycle.
* See Note 1 on Page 83.
** See Note 2 on Page 83.
Continued

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 75

 OPERATION

Modbus, BACnet, LonTalk interoperability

Table 76-1:
Interoperability variable and object names (continued)
Read Only BACnet Units Range
Modbus
Variable name and (RO) or Object LonTalk variable
register Description
BACnet object name Read Write Type and names**
number* I-P units SI units I-P units SI units
(RW) Instance
Read-only analog variables (continued)
IR-23 MT steam demand 0 to 0 to
MT_sys_output_mass_hr RO AI-08 nvoMT_SteamOMass lbs/hr kg/h
30023 mass 100000 100000
IR-25 MT steam demand
MT_sys_output_pcnt RO AI-09 nvoMT_SteamOP % % 0 to 100 0 to 100
30025 percent
Current_1 IR-26
RO AI-10 nvoXT_current1 XT operating current Amps Amps 0 to 100 0 to 100
(XT systems only) 30026
Current_2 IR-27 XT operating current,
RO AI-11 nvoXT_current2 Amps Amps 0 to 100 0 to 100
(XT systems only) 30027 right cylinder
In_Pressure IR-28
RO AI-12 nvoInPressure Input (supply) pressure psi bar 0 to 100 0 to 100
(High-Pressure systems only) 30028
Out_Pressure IR-29 0 to 0 to
RO AI-13 nvoOutPressure Output pressure psi bar
(High-Pressure systems only) 30029 1500 1500
IR-30 0 to 0 to
Current_COC RO AI-14 nvoCurrentCOC Current tank COC -- --
30030 1000 1000
IR-31 Supply water 0 to 0 to
Supply_water_conductivity_µs RO AI-15 nvoSupply_µS µS µS
30031 conductivity in µS 1000 1000
IR-32
Stage_1_temperature RO AI-16 nvoStage1Temp Stage 1 temperature ºF ºC 0 to 150 0 to 150
30032
IR-33
Stage_2_temperature RO AI-17 nvoStage2Temp Stage 2 temperature ºF ºC 0 to 150 0 to 150
30033
IR-34
Stage_3_temperature RO AI-18 nvoStage3Temp Stage 3 temperature ºF ºC 0 to 150 0 to 150
30034
IR-35
Supply_air_temperature RO AI-19 nvoSupplyAirTemp Supply air temperature ºF ºC 0 to 150 0 to 150
30035
IR-36 Stage 1 media
Stage_1_effectiveness RO AI-20 nvoStage1Effect % % 0 to 100 0 to 100
30036 effectiveness
IR-37 Stage 2 media
Stage_2_effectiveness RO AI-21 nvoStage2Effect % % 0 to 100 0 to 100
30037 effectiveness
IR-38 Stage 3 media
Stage_3_effectiveness RO AI-22 nvoStage3Effect % % 0 to 100 0 to 100
30038 effectiveness
IR-39
Output_temperature RO AI-23 nvoOutputTemp Output temperature ºF ºC 0 to 150 0 to 150
30039
IR-40
Wet_bulb_temperature RO AI-24 nvoWetBulbTemp Wetbulb temperature ºF ºC 0 to 150 0 to 150
30040
IR-41
Storage_pressure RO AI-25 nvoStoragePress Storage pressure psi bar 0 to 100 0 to 100
30041
IR-42 0 to 0 to
Pump_hours RO AI-26 nvoPumpHours Pump runtime hours hours hours
30042 100000 100000
IR-43 0 to 0 to
TDS RO AI-27 nvoTDS TDS -- --
30043 1000 1000
IR-44 Active pump station
HPS_pump_station_operating RO AI-28 nvoActPSnumber -- -- 0 to 4 0 to 4
30044 number
Continued

76 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Modbus, BACnet, LonTalk interoperability

Table 77-1:
Interoperability variable and object names (continued)
Read Only BACnet Units Range
Modbus
Variable name and (RO) or Object LonTalk variable
register Description
BACnet object name Read Write Type and names**
number* I-P units SI units I-P units SI units
(RW) Instance
Setup variables
Mode of the unit or
system. The defined
options are:
HR-1
Write MSV-01 nviRunMode 1 Auto -- -- 1 to 4 1 to 4
40001
2 Local standby
3 System standby
4 Manual drain

Run_mode Mode of the unit or

system. The defined
options are:
1 Auto
HR-1
Read MSV-01 nvoRunMode 2 Local standby -- -- 1 to 6 1 to 6
40001
3 System standby
4 Manual drain
5 Test outputs
6 Test run
Humidity set point
HR-2
Space_RH_set_point Write AV-05 nviSpaceRHsetPt for the space being % % 0 to 100 0 to 100
40002
humidified.
Dew point set point
HR-3
Space_dew_point_set_point Write AV-06 nviSpaceDewPtSP for the space being ºF ºC 20 to 80 -6 to 26
40003
humidified.
HR-4 Duct high limit set
Duct_high_limit_set_point Write AV-07 nviDuctHLsetPt % % 0 to 100 0 to 100
40004 point.
* See Note 1 on Page 83.
** See Note 2 on Page 83.
Continued

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 77

 OPERATION

Modbus, BACnet, LonTalk interoperability

Table 78-1:
Interoperability variable and object names (continued)
Read Only BACnet Units Range
Modbus
Variable name and (RO) or Object LonTalk variable
register Description
BACnet object name Read Write Type and names**
number* I-P units SI units I-P units SI units
(RW) Instance
Setup variables (continued)
Steam output (as
demanded via fieldbus)
in pounds or kilograms
HR-5 0 to 0 to
Fieldbus_demand_mass Write Only AV-08 nviFbusDemndMass per hour. If the request lbs/hr kg/h
40005 100,000 100,000
exceeds the unit’s
capacity, the unit will run
at 100% capacity.
Steam output (as
demanded via the
HR-6
Fieldbus_demand_% Write Only AV-09 nviFldBusDemandP fieldbus) as a percentage % % 0 to 100 0 to 100
40006
of the humidifier’s total
capacity.
HR-7
PID_band RW AV-10 nciPIDband PID band. % % 0 to 50 0 to 50
40007
HR-8 PID-Kp (proportional 0 to
PID-Kp RW AV-11 nciPIDkp -- -- 0 to 1000
40008 gain) factor. 1000
HR-9 PID-Ki (integral gain) 0 to
PID-Ki RW AV-12 nciPIDki -- -- 0 to 1000
40009 factor. 1000
HR-10 PID-Kp (derivative gain) 0 to
PID-Kd RW AV-13 nciPIDkd -- -- 0 to 1000
40010 factor. 1000
"MT runmode;
HR-14
Write MSV-02 nviMTRunMode 1 = system standby, -- -- 1 to 2 1 to 2
40014
2 = system auto"
MT_runmode
"MT runmode;
HR-14
Read MSV-02 nvoMTRunMode 1 = system standby, -- -- 1 to 2 1 to 2
40014
2 = system auto"
MT fieldbus request
HR-15 0 to 0 to
MT_steam_req_mass_hr Write Only AV-14 nviMT_FBDmndMass for steam in pounds or lbs/hr kg/h
40015 100000 100000
kilograms per hour
MT fieldbus request for
HR-17
MT_steam_req_sys_pcnt Write Only AV-15 nviMT_FBDmndP steam in percentage of % % 0 to 100 0 to 100
40017
system capacity
HPS number of hours
HR-18 0 to 0 to
Pump_1_hours RW AV-16 nviPump1Hours pump 1 has run since hours hours
40018 100000 100000
reset
HPS number of hours
HR-19 0 to 0 to
Pump_2_hours RW AV-17 nviPump2Hours pump 2 has run since hours hours
40019 100000 100000
reset
HR-20 Desired cycles at 0 to
Target_COC RW AV-18 nviTargetCOC -- -- 0 to 1000
40020 concentration 1000
HR-21
Pump_selected RW AV-19 nvoPumpSelect HPS systems only 0 = Pump 1; 1 = Pump 2
40021
* See Note 1 on Page 83.
** See Note 2 on Page 83.
Continued

78 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Modbus, BACnet, LonTalk interoperability

Table 79-1:
Interoperability variable and object names (continued)
Read Only BACnet Units Range
Modbus
Variable name and (RO) or Object LonTalk variable
register Description
BACnet object name Read Write Type and names**
number* I-P units SI units I-P units SI units
(RW) Instance
Read-only digital I/O
DI-1
Airflow_proving_switch RO BI-01 nvoAirflowSwitch 0=Open; 1=Closed
10001
DI-2
Duct_HL_switch RO BI-02 nvoDuctHLswitch 0=Open; 1=Closed
10002
DI-3
Safety_interlock RO BI-03 nvoSafetyI-lock 0=Open; 1=Closed
10003
DI-4 0=Damper Closed;
Combustion_air_damper_(GTS) RO BI-04 nvoCombustAirDmp
10004 1=Damper Open
Stage_1_(High-Pressure DI-4
RO BI-04 nvoCombustAirDmp 0=Closed; 1=Open
System) 10004
DI-5
Flue_pressure_switch_(GTS) RO BI-05 nvoFluePressurSw 0=Open; 1=Closed
10005
Stage_2_(High-Pressure DI-5
RO BI-05 nvoFluePressurSw 0=Closed; 1=Open -- -- -- --
System) 10005
DI-6 0=Vent Off; 1=Vent
Power_vent_switch_(GTS) RO BI-06 nvoPowerVentSwch
10006 On
DI-6 0=Not ready;
XV_header_status_(STS) RO BI-06 nvoPowerVentSwch
10006 1=Ready
Stage_3_(High-Pressure DI-6
RO BI-06 nvoPowerVentSwch 0=Closed; 1=Open
System) 10006
DI-7 0=No Water;
Low_water_sensor_ (GTS) RO BI-07 nvoLowWaterSensr
10007 1=Water
DI-8
Fill_valve RO BO-01 nvoFillValve 0=Closed; 1=Open
10008
DI-9 0=Not Draining;
Drain_valve RO BO-02 nvoDrainValve
10009 1=Draining
MT_active_fault_exists_ DI-10
RO BI-08 nvoMt_AlarmSomWr 0=No; 1=Yes Multi-tank only
somewhere 10010
MT_active_message_exists_ DI-11
RO BI-09 nvoMt_MsgSomWr 0=No; 1=Yes Multi-tank only
somewhere 10011
DI-12 0=No Water;
High_water_sensor RO BI-10 nvoXT_HighWater1 XT systems only
10012 1=Water
DI-13 0=No Water; Right cylinder, 2-cylinder XT systems
High_water_sensor_2 RO BI-11 nvoXT_HighWater2
10013 1=Water only
DI-14 0 = No Fault; 1 =
VFD_drive_fault RO BI-12 nvoDriveFault HPS systems only
10014 Fault
0 = Valve not
DI-15
XV: 2 position shutoff valve RO BO-03 N/A powered; 1 = Valve
10015
powered
XV: 2 position shutoff valve DI-16
RO BI-13 N/A 0 = Open; 1 = Closed XV with VL only
end switch 10016
DI-17 0 = Empty, OK to run;
XV: Float switch RO BI-14 N/A XV with VL only
10017 1 = Full
* See Note 1 on Page 83.
** See Note 2 on Page 83.
Continued

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 79

 OPERATION

Modbus, BACnet, LonTalk interoperability

Table 80-1:
Interoperability variable and object names (continued)
Read Only BACnet Units Range
Modbus
Variable name and (RO) or Object LonTalk variable
register Description
BACnet object name Read Write Type and names**
number* I-P units SI units I-P units SI units
(RW) Instance
Faults and alarms
DV-1
ProgOutput1_status RO BV-01 nvoDryContact1
1
0=Open; 1=Closed
DV-2
ProgOutput2_status RO BV-02 nvoDryContact2
2
Flag that a manual
DV-3
Active manual clear alarms exit RO BV-03 nvoAlarms clear alarm exists in
3
the system
DV-4 When set will clear all
Clear all active alarms RW BV-04 nviClearAllFault
4 active faults
DV-5
Tank temp sensor failed RW BV-05 nvoAlrmTnkTmpSen
5
Tank overtemp, Unit reboot DV-6
RW BV-06 nvoAlrmOvertemp
required 6
nvoAlrmRHsignal
DV-7
Signal at RH input out of range RW BV-07 nvoAlrmDewPtSgnl
7
nvoAlrmDemndSgnl
DV-8
Duct RH sig out of range RW BV-08 nvoAlrmDuctRHsig
8
DV-9
Aux temp sense out of range RW BV-09 nvoAlrmAuxTemp
9
DV-10
Water probe miswired RW BV-10 nvoAlrmProbeWire -- -- -- --
10
Faulty water probe DV-11
RW BV-11 nvoAlrmProbeFail
HPS: VFD fault 11
DV-12
Excessive fill time RW BV-12 nvoAlrmFillTime See Table 49-1,
12
Alarms menu
DV-13
Excessive refill time RW BV-13 nvoAlrmRefilTime
13
Tank not draining DV-14
RW BV-14 nvoAlrmNoDrain
LMH: Check humidifier floats 14
Excessive boil time, Unit reboot DV-15
RW BV-15 nvoAlrmXessWater
required 15
DV-16
No SDU airflow RW BV-16 nvoAlrmNoSDUair
16
GTS: No power vent airflow DV-17
RW BV-17 nvoAlrmPrVentAir
STS: XV header flooded 17
DV-18
No combustion airflow RW BV-18 nvoAlrmNoCombAir
18
DV-19
Blocked flue RW BV-19 nvoAlrmBlockdFlu
19
DV-20
Burner 1 fault RW BV-20 nvoAlrmBurner1
20
* See Note 1 on Page 83.
** See Note 2 on Page 83.
Continued

80 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Modbus, BACnet, LonTalk interoperability

Table 81-1:
Interoperability variable and object names (continued)
Read Only BACnet Units Range
Modbus
Variable name and (RO) or Object LonTalk variable
register Description
BACnet object name Read Write Type and names**
number* I-P units SI units I-P units SI units
(RW) Instance
Faults and alarms (continued)
DV-21
Burner 2 fault RW BV-21 nvoAlrmBurner2
21
DV-22
Burner 3 fault RW BV-22 nvoAlrmBurner3
22
DV-23
Burner 4 fault RW BV-23 nvoAlrmBurner4
23
DV-24
Ignition module 1 fault RW BV-24 nvoAlrmIgnitMod1
24
DV-25
Ignition module 2 fault RW BV-25 nvoAlrmIgnitMod2
25
DV-26
Ignition module 3 fault RW BV-26 nvoAlrmIgnitMod3
26
DV-27
Ignition module 4 fault RW BV-27 nvoAlrmIgnitMod4
27
GTS: Blower 1 fault DV-28
RW BV-28 nvoAlrmBlower1
WM: Temp sensor stage 1 fault 28
GTS: Blower 2 fault DV-29
RW BV-29 nvoAlrmBlower2
WM: Temp sensor stage 2 fault 29
GTS: Blower 3 fault DV-30
RW BV-30 nvoAlrmBlower3
WM: Temp sensor stage 3 fault 30 See Table 49-1,
-- -- -- --
GTS: Blower 4 fault DV-31 Alarms menu
RW BV-31 nvoAlrmBlower4
WM: Temp sensor In fault 31
DV-32
Gas valve 1 fault RW BV-32 nvoAlrmGasValve1
32
DV-33
Gas valve 2 fault RW BV-33 nvoAlrmGasValve2
33
DV-34
Gas valve 3 fault RW BV-34 nvoAlrmGasValve3
34
DV-35
Gas valve 4 fault RW BV-35 nvoAlrmGasValve4
35
GTS: Low water
DV-36
Electric: Overtemp cutout, Unit RW BV-36 nvoAlrmLowWater
36
reboot required
XT: Excessive foaming 2
DV-37
HPS/LMH: Low inlet pressure RW BV-37 nvoAlrmFoaming2
37
GTS: Replace ignitors!
DV-51
Current sensor out of range RW BV-51 nvoAlrmCurSense1
51
DV-52
Current sensor 2 out of range RW BV-52 nvoAlrmCurSense2
52
* See Note 1 on Page 83.
** See Note 2 on Page 83.
Continued

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 81

 OPERATION

Modbus, BACnet, LonTalk interoperability

Table 82-1:
Interoperability variable and object names (continued)
Read Only BACnet Units Range
Modbus
Variable name and (RO) or Object LonTalk variable
register Description
BACnet object name Read Write Type and names**
number* I-P units SI units I-P units SI units
(RW) Instance
Faults and alarms (continued)
XT: Overcurrent DV-53
RW BV-53 nvoAlrmOverCur1
HPS: High inlet pressure 53
XT: Supply water failure DV-54
RW BV-54 nvoAlrmSupplyH201
HPS: Low inlet water temp 54
XT: Excessive foaming DV-55
RW BV-55 nvoAlrmFoaming1
HPS: High pump pressure 55
XT: Overcurrent 2 DV-57
RW BV-57 nvoAlrmOverCur2
HPS: High inlet water temp 57
See Table
XT: Supply water 2 failure DV-58
RW BV-58 nvoAlrmSupplyH202 50-1,
HPS: Low pump pressure 58
Alarms menu
DV-61 -- -- -- --
Low inlet pressure RW BV-61 nvoAlrmInPress
61
DV-62
High outlet pressure RW BV-62 nvoAlrmOutPress
62
DV-63
Pressure_sensor_out_of_range RW BV-63 nvoAlrmPressSense
63
DV-64
Excessive TDS during fill RW BV-64 nvoAlrmHighTDS
64
HPS redundant
DV-66
Pump station cannot run RO BV-66 nvoAlarmHPSsys system cannot
66
run
XV has failed
DV-68 to clear the
XV: Condensate clearing failure RW BV-68 N/A
68 header of
condensate
XV 2 position
valve end
DV-69 switch failed
XV: 2 position valve failure RW BV-69 N/A
69 to close while
the valve was
powered
* See Note 1 on Page 83.
** See Note 2 on Page 83.
Continued

82 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Modbus, BACnet, LonTalk interoperability

Table 83-1:
Interoperability variable and object names (continued)
Read Only BACnet Units Range
Modbus
Variable name and (RO) or Object LonTalk variable
register Description
BACnet object name Read Write Type and names**
number* I-P units SI units I-P units SI units
(RW) Instance
Messages
GTS: Replace ignitors soon
DV-38
Electric: Replace contactors RW BV-38 nvoMsgReplCntctr
38
WM: Replace UV lamp
DV-39
Service unit RW BV-39 nvoMsgSrviceUnit
39
DV-40
Drain pending RW BV-40 nvoMsgDrainPend
40
DV-41
No airflow RW BV-41 nvoMsgNoDuctAir
41
DV-42
Interlock open RW BV-42 nvoMsgIlockOpen
42
DV-43
Freeze drain RW BV-43 nvoMsgFreezDrain
43
DV-44
End of season drain active RW BV-44 nvoMsgEOSactive
44
DV-45
Temp comp on RW BV-45 nvoMsgTempCompOn See Table 46-1,
45 -- -- -- --
Diagnostics menu
DV-46
Clean probes RW BV-46 nvoMsgCleanProbe
46
DV-47
Duct HL trip RW BV-47 nvoMsgDuctHLtrip
47
DV-48
Duct HL span RW BV-48 nvoMsgDuctHLspan
48
DV-49
Insufficient water flow RW BV-49 nvoMsgH2Ocutout
49
DV-50
Boiling temp calibrated RW BV-50 nvoMsgBoilTempCl
50
XT: Check cylinder, end of life DV-56
RW BV-56 nvoMsgChkCyl1
HPS: Low inlet water temp 56
DV-59
Check cylinder 2, end of life RW BV-59 nvoMsgChkCyl2
59
DV-60
Main enable open RW BV-60 nvoMsgMainEnb
60
Dv-65
Excessive TDS during fill RW BV-65 nvoMsgHighTDS
65
XV is attempting to
DV-67
XV: Clearing condensate RO BV-67 N/A clear condensate out
67
of the header
Notes:
1. Modbus Input Registers (IR1-IR44) 16 bit read only
Modbus Holding Registers (HR1-HR21) 16 bit read/write
Modbus Discrete Input Registers (DI1-DI7) single bit read only
Modbus Coil Registers (DV1-DV69) single bit read/write
2. nvi LonTalk SNVTs are write-only; nvo are read-only

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 83

 OPERATION

Multiple-tank operation
MULTI-TANK MODE DEFINED Staging multiple XT humidifiers
In multi-tank mode, one Vapor-logic controller can control multiple humidifier XT and Low-maintenance humidifiers do not
tanks, and tanks in a multi-tank system can vary by energy source and operate in multi-tank mode; however, up to
four XT humidifiers can be staged to operate
capacity. in sequence.

A multi-tank system has one main controller controlling up to 16 secondary See “Staging multiple XT humidifiers” on
Page 37.
tanks. The main controller receives the demand signal and controls
secondary tank steam production based on
• priority group,
• wear leveling,
• fault status.

The main controller also gives permission to secondary humidifier tanks to perform functions, such as draining and
flushing.

The main controller must be

• field-wired to all required control input signals,
• connected to all secondary tanks via the DriSteem fieldbus,
• powered during system operation.

MULTI-TANK CONTROL INTERFACE

Most systems have one Vapor-logic keypad per multi-tank group. This keypad ships with the tank that has the main
control board. The keypad (or the Web interface; see note below) can be connected to any humidifier in the multi-tank
group. Maximum cable length from the keypad to any control board in the multi-tank group is 500' (152 m).

Note: M
 ulti-tank groups can also be operated using the Web interface. See “Multi-tank operation with Web interface”
on Page 88.

START-UP ORDER AND TRIM TANKS

All humidifier tanks in a multi-tank group are factory-assigned to a priority group. There are four priority groups: 0, 1, 2,
and 3.

Priority groups identify tank function as follows:

0 = Trim tanks 2 = Priority 2 tanks (peak)

1 = Priority 1 tanks (load) 3 = Redundant tank

• Priority groups identify start-up order:

Tanks in priority group 0 are brought online first, followed by tanks in priority group 1, then 2. Priority group 3
designates an optional redundant tank, which comes online only if a tank in the system is unavailable and the
remaining tanks cannot meet capacity.
• Trim tank responds first:
A trim tank is assigned to priority group 0 and is brought online first — always before tanks in priority groups 1, 2,
or 3. The trim tank modulates continuously, responding to system demand changes.
Multi-tank groups requiring a rapid response to changes in system demand typically have an electric element
humidifier with SSR control as the trim tank.

84 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Multiple-tank operation
TANK GROUPING TO MAXIMIZE EFFICIENCY Configuration tips
Priority 1 and priority 2 tanks can be grouped to improve efficiency. Tanks not • Use priority groups 1 and 2 to group tanks
identified as trim or redundant tanks are factory-assigned to priority groups 1 for maximum energy efficiency. For example,
put gas-fired tanks in group 1 and electric
and 2. Priority 1 tanks come online before priority 2 tanks. Because tanks in a tanks in group 2.
multi-tank system can vary by capacity, this allows tank grouping to maximize
• Multiple small-capacity tanks usually operate
efficiency, bringing tanks online in the order that best matches humidification more efficiently than one large-capacity tank
load to individual tank capacity. meeting the same load requirement.

• Use priority groups 1 and 2 to group tanks

EXAMPLE 1:
by capacity, bringing tanks online in the
A large-capacity tank that meets humidification demand most days is order that best matches humidification load
assigned to priority group 1. to individual tank capacities.

Smaller-capacity tanks, needed only when additional capacity is needed, • If your multi-tank system has a redundant
are assigned to priority group 2. tank, configure that tank as the main
controller. This will reduce system down
time while the main controller tank receives
EXAMPLE 2:
servicing. Since the redundant tank operates
A gas-fired tank that meets humidification demand most days is assigned to the least in a multi-tank system, it is the tank
priority group 1. most likely to remain online.

Electric tanks, needed only when additional capacity is needed, are • Match the capacity of the redundant tank
assigned to priority group 2 to the largest tank in the system to ensure
the system’s ability to meet maximum
Note: Wear leveling occurs only within a priority group. humidification load when a tank goes offline.

See Note 1 in Table 86-1.

REDUNDANT TANK FOR MISSION-CRITICAL APPLICATIONS
A redundant tank can be assigned for mission-critical applications. The system
capacity of a multi-tank group is the combined capacity of tanks in groups
0, 1, and 2. Placing a tank in priority group 3 ensures that it only runs as a
redundant tank. The redundant tank can be assigned to priority group 3 and
will operate only if one or more of the tanks in groups 0, 1, and 2 are not
available, and the remaining tanks in the multi-tank group cannot meet demand
for steam production.

Note: F or best performance, multiple electric humidifiers in a given priority

group must all have the same heater controls. That is, they should all be
100% SSR control, or all be sequenced SSR control, or all be contactor
control.

TANK WEAR LEVELING

The main controller monitors tank wear and assigns steam production to tanks
to equalize wear as much as possible within each priority group.

FAULT TOLERANCE
The main controller monitors tank status of all tanks in a multi-tank group
periodically. If a tank goes offline or is not communicating (“No comm”) for
a defined time period, the controller identifies that tank as unavailable and
the system responds using other available tanks. If the main controller stops
operating, the remaining secondary tanks continue to run for a short time at the
level they were last run, and then quit.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 85

 OPERATION

Multiple-tank operation

Table 86-1:
Multitank priority groups application example
Priority
Assignment Description Application considerations
group

• Provides humidification load “throttling,” this unit sees the small changes as demand An SSR-controlled electric resistive
changes. unit will provide the best control.
0 Trim
• Generally, this should be one tank, and it should be relatively small.
• Generally, this tank should be an SSR-controlled electric resistive unit.
GTS and STS are the most cost
• Carries the bulk of the load; should be the most cost-effective fuel source.
1 Load effective, but any unit can be
• Only sees large-step changes if a trim tank is used.
used.
• Makes up the demand not met by trim + load. Electric resistive are the most cost
• Does not run often, because it is needed in only the most demanding situations. effective (any unit can be used).
2 Peak • Because it does not run frequently (making fuel cost less of an issue), this is a good
assignment for a lower-up-front-cost humidifier.
• Run time is a function of load percentage split into the peak category.
• Provides the capability to offset a tank that is offline for any reason. • Electric humidifiers are the most
• This tank will only run when a trim, load, or peak unit is shut down for service or cost-effective up front.
alarm conditions and the remaining trim, load, and peak tanks cannot meet demand. • Size should be the determining
3 Redundant • The redundant should be as large as the largest tank in the system. factor.
See Note 1 below. • Any unit will work.
• If a redundant tank is used, making it the main controller improves system uptime,
since you will not need to bring down the main controller to service it.
Notes:
1. If protection is required against multiple tanks being offline at the same time, the redundant tank should be at least as large as the sum of the X
largest tanks where X is the number of tanks for which protection is desired.
2. From a fuel cost standpoint, electric should have the lowest priority. It should run last and the least.
3. From an energy standpoint, GTS generally has the lowest operating cost.
4. When calculating energy, consider heat loss from distribution and piping of steam.
5. Humidifiers within a priority group are load leveled.
6. Humidifiers within a group should have the same energy source.

86 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Multiple-tank operation
WIRING A MULTI-TANK GROUP OF HUMIDIFIERS Important:
To wire a multi-tank group of humidifiers:
All multi-tank communication must go through
the main controller to reach secondary tanks.
1. Determine which control board is the main controller. The main controller Therefore, keypad/display communication
ships with the keypad/display. The main controller is labeled as Tank A on requires that power is supplied to:
the keypad/display and on the tank’s product label.
• The main controller (on Tank A)
2. Connect all required control inputs to the main controller board by • Any other tank that is hosting the keypad/
display
following the instructions in “Control input” on Page 12.
3. Wire all control boards of the multi-tank group together using twisted pair
wire.
Important: DriSteem recommends using one pair of wires of a Cat-5 cable.
Do not use non-twisted two-conductor wire.
Connect controller boards together at terminal block P8. Connect positive
to positive terminals, and negative to negative terminals. On the last board
in the series of connected boards, jumper the pins at J1001 (located on the
Vapor-logic board next to the RJ11 phone socket, see Page 5). On all other
boards, J1001 should not be shunted.

4. If you plan to use the Web interface, follow the wiring instructions in “Web
interface communication” on Page 21.
Note: E
 ach tank must be connected via Ethernet to a network system for the
Web interface to access all tanks in the multi-tank group.

5. Connect the keypad/display cable to any control board in the multi-tank

system. The main tank must be powered for the display to communicate.

MULTI-TANK SYSTEM SETUP

Factory configuration
Humidifier tanks ordered as a multi-tank group are configured at the factory.
The factory configuration process includes:

• Assigning letter names to tanks (Tank A, Tank B, .... Tank P).

Note: The main tank is always configured as Tank A.
• Assigning priority group numbers (0, 1, 2, 3)
• Configuring the controllers

Changing factory configuration

Change tank designation using the Web interface only. Go to the Web screen
Setup menu to access Multi-tank setup/Tank designator.

Important:
Any change made to or from the tank controller designated as “A” will cause
an approximate five-second delay while the board reboots. During this time the
Web interface display will not change.

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 87

 OPERATION

Multiple-tank operation
CHANGING A PRIORITY GROUP
To change a priority group, go to the Setup menu to access Multi-tank setup/
Tank priority group.

To add a tank to a multi-tank system:

1. Verify that the new tank has the correct tank designator. Change, if
necessary, before wiring in Step 2.
2. Connect wiring of new tank.
3. The main controller automatically adds the new tank’s capacity into the
total system capacity.

To permanently remove a tank from a multi-tank system:

1. Disconnect control board wiring (location P8) of the tank being removed.
2. Reset system capacity from the Multi-tank setup menu. The controller will
automatically calculate the new system capacity.
Important:

• Each tank in a multi-tank system must have a unique tank designator (A, B,
C ... P). Duplicate tank designations will cause multi-tank mode to operate
incorrectly.
• Each Vapor-logic board ships with a network IP address of 192.168.1.195.
When installing on an Ethernet network, assign each board a unique IP
address to avoid conflict with other devices on the network.

OTHER SYSTEM PARAMETERS AND INTEROPERABILITY

General system parameters are set the same as for stand-alone tank/controller.
See the Setup section of this manual for instructions.

MULTI-TANK OPERATION WITH WEB INTERFACE

If you plan to use the Web interface for multi-tank operation, the web interface
must first be configured, see "Web interface communication" on Page 21.

88 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Multiple-tank operation
USING THE KEYPAD/DISPLAY
The keypad/display can communicate with every humidifier
tank’s controller in a multi-tank group. When a multi-tank group is
operating normally, the keypad/display shows the Main screen.
See the screens below for information about display screens in a
multi-tank system.

Main screen SPACE RH SET PT

35%
20% OUTPUT
MAIN 0%
y
MODE:S sAuto
MAIN MESSAGE ALARM

Main Menu screen MAIN MENU 1/5 A

Select Multitank status Multitank status
to view other tanks in a Tank status
multitank system (other menu Dia g nostics
items refer to Tank A on this
Alarms
screen).
Tank setu p
HOME

Multitank Status screen MULTITANK 1/17 A

Select MT Main MT Main
to view the Main screen A Cold
(shown below). Select A, B, B <No comm>
or C, etc., to view other tanks C <No comm>
in the system.
D <No comm>
HOME BACK

Tank A screen
Note here that Tank A has
SPACE RH SET PT 116˚F
35%
20%
0% output because it is not
yet at boiling temperature.
OUTPUT
TANK A 0%
MODE:Auto Warm
MAIN MESSAGE ALARM

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 89

 OPERATION

Multiple-tank operation
USING THE WEB INTERFACE
Additional Web interface screens, described below, appear when
operating in multi-tank mode.

This letter identifies which tank

(A ... P) you are viewing.

Each connected tank automatically

shows up as a link. Click on a tank
link to view its status.
Important: All system tanks must be
network-connected via Ethernet for
these links to function.

Click on the Setup tab

to view Multi-tank setup
parameters.

90 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Troubleshooting guide
SOLVING ISSUES DriSteem Technical Support:
1. Review issues, possible causes and recommended actions. 800-328-4447

The troubleshooting guide on the following pages presents issues, possible

causes and recommended actions for typical issues.

2. Review tank or dispersion manuals.

If you have a tank‑related or dispersion-related issue, you may also need to
refer to those specific product manuals.

3. If you’re still having issues, call DriSteem.

If the troubleshooting guide does not help you solve your issue, call
DriSteem with the following information available:
• Product name and serial number
You’ll find this information on the humidifier or control cabinet.
• Issue definition
Example: water leaking, low humidity, high humidity, etc.
• Alarms or Messages Log items (if applicable)
Example: Tank temp, probe wiring, etc.
• Time issue began
Example: Always, after remodel, after a change in weather, etc.
• System changes
Example: Pressure, new boiler, new service, new controller, relocation,
change in maintenance, etc.

CALLING DRISTEEM TECHNICAL SUPPORT

Have the following information ready before calling:

Vapor-logic firmware version ___________________________________________

Humidifier model number ______________________________________________

Humidifier serial number _______________________________________________

Issue definition _______________________________________________________

Alarms Log items _____________________________________________________

Messages Log items ___________________________________________________

Time issue began _____________________________________________________

Recent system changes_________________________________________________

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 91

 OPERATION

Troubleshooting guide

Table 92-1:
Troubleshooting guide
Issue Possible causes Actions
• No control voltage • Check for proper supply voltage.
Green power indicator light is off. • Heater fuses open • Check heaters and replace fuses.
• Transformer secondary circuit breaker tripped • Check for wiring shorts; reset breaker.
• Dry contact or triac connection not programmed • Go to the programmable outputs section of Setup
from Setup menu menu to program dry contacts.
• Field wiring not installed • Provide field wiring.
No remote indication of alarm light
No remote activation of fan • 
Field-supplied remote fault indicator lamp is burned • Check if at remote indicator light is burned out;
out replace if needed.
• Remote fault Vapor‑logic dry contact is not • Check dry contact continuity (Vapor‑logic terminal
switching P12) for contact closure.
• No power or incorrect voltage to Vapor‑logic • Check main power supply.
board • Reset control transformer circuit breaker if tripped.
No readable information on • Reset thermal cutout if tripped.
keypad/display • Low limit thermostat is not satisfied (outdoor
Power issues

enclosure only).
• Modular communication cable is disconnected • Connect modular cable.
• Nonexistent supply voltage to unit • Check main fuse.
• Check main line safety switches.
• Check heater fuses.
• Nonexistent 24 VAC supply • Check for proper supply.
• Verify proper transformer voltage characteristics.
Keypad/display does not energize • Verify proper wiring of transformer.
• Check for control circuit voltage, 24 VAC. If
voltage is not present, check transformer circuit
breaker. Reset if needed.
• Humidifier over-temperature thermostat open • Reset manual switch located above heater below
terminal cover.
• Keypad/display is overheated • Cool the keypad.
• Communication cable not connected • Connect cable.
Display is completely black • Defective cable • Replace cable.
• Defective keypad • Replace.
• Defective control board • Contact DriSteem.
Continued

92 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Troubleshooting guide

Table 93-1:
Troubleshooting guide (continued)
Issue Possible causes Actions
When transmitter or humidistat alarms appear, • Check voltages at board terminals.
Alarm:
possible causes are: At terminal P11
RH signal out of range
• Open, shorted, or incorrect wiring -- RH signal: 2-10 VDC.
• Incorrect signal -- Dew point signal: 2-10 VDC.
Alarm: • Ground loop -- Demand signal: 0-16 VDC.
Dew point signal out of range • Signal exceeds range limits. Correct input At terminal P13
signals are: 4-20 mA, or 0-16 VDC -- Duct high limit signal: 0-21 VDC, 2-10 VDC.
Transmitter or humidistat issues

At terminal P14
Alarm:
-- Auxiliary temp sensor or temperature compensation
Demand signal out of range
sensor: 2-10 VDC.
• Check output on transmitter:
Alarm: -- If there is no output, replace transmitter.
Duct RH signal out of range -- Verify output is 4-20 mA.
-- Calibrate transmitter or humidistat if necessary.
Alarm: • Isolation control board by others may not be compatible.
Aux temp sens out of range Consult DriSteem.

• SDU blower or airflow proving switch is • Check SDU for proper wiring.
incorrectly wired

Alarm: • SDU blower cover is off • Install cover.

No SDU airflow • SDU blower motor is inoperable (SDU fan does • Replace SDU blower.
not start)
• Breaker tripped • Reset breaker.
Continued

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 93

 OPERATION

Troubleshooting guide

Table 94-1:
Troubleshooting guide (continued)
Issue Possible causes Actions
Alarm: • Incorrect installation • Verify proper wiring of probe system. Do not use shielded
Water probe miswired (screened) wiring.
• Verify probe wiring is not routed with high voltage wiring.
Alarm: • Verify wiring between control cabinet and humidifier does not
Faulty water probe exceed the recommended 50' (15 m) limit.
• Verify fill and drain plumbing was installed per the instructions
in the humidifier's manual.
• Verify piping from the humidifier to the dispersion assembly is
installed correctly, that there are no elbows or restrictions in the
Water level control probe issues

piping, and that the length of the piping is not too long. See
instructions in the humidifier's manual.
• Verify there is a P-trap installed on the tank and/or that the
P-trap is not plugged.
• Verify that there is a machine ground between control cabinet
and humidifier tank.
• Dirty or oxidized probes • Clean probe, removing oxidation and/or minerals or replace
if needed.
• Drain tank water to below the probe; reset system and restart.
• Deterioration of probe rod assembly • Replace probe rod assembly.
• Low conductivity water supply • If conductivity is less than 30 µS/cm add ¼-½ tab sodium
bicarbonate (i.e., Alka Seltzer) to increase conductivity.
Consult DriSteem for further advice.
• Humidifier interlock switches and/or over- • Verify that switch or thermostat is wired.
temperature thermostat • Verify interlock switch is set correctly and humidifier cover is on.
• Reset over-temperature thermostat if tripped.
• Missing probe rod • Replace missing probe rod if possible; otherwise, replace
probe assembly.
Continued

94 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Troubleshooting guide

Table 95-1:
Troubleshooting guide (continued)
Issue Possible causes Actions
Alarm: Tank is not full.
Excessive fill time
• Fill and drain valve wiring reversed • Correct wiring.
Alarm: • Low water supply pressure • Verify water pressure is 25 psi (552 kPa) minimum.
Excessive refill time • In-line strainer plugged • Clean as needed.
• H
 umidifier cover interlock switch improperly • Correct wiring.
wired
• Fill valve not open • If 24 VAC is present across fill valve coil, replace valve.
• Fill valve not wired properly to control board • Verify proper fill valve wiring at terminal P17 (fill, drain).
• Test operation by going to the Test section under the Diagnostics
menu.
• Inlet water needle valve closed or plugged • Check if needle valve is open and free of sediment.
• Fill valve with incorrect operating voltage • Verify valve coil is 24 VAC.
• Plugged fill valve • Remove fill valve and check for foreign material plugging the valve.
• Fill valve installed backward • Check arrow direction on valve; or ”In” should be visible on fill
valve body.
• Excessive water hammer can bend a needle • Replace valve, if needed.
valve and make it difficult to open • Install a water supply line shock arrester.
• Orifice after fill valve may be plugged • Service valve strainer and orifice assembly.
• Drain valve leaking water • Verify drain is in the Auto position and is closed.
• Missing probe rod • Replace missing probe rod if possible; otherwise, replace probe
Filling issues

rod assembly.
Tank is full.
• Probe malfunctioning • Clean or replace probe.
Low water conductivity: • Add add ¼-½ tab sodium bicarbonate (i.e., Alka Seltzer) to
• Tap/softened water GTS humidifiers and electric increase water conductivity. Consult DriSteem for further advice.
humidifiers with heating elements require fill
water conductivity to be 30 µS/cm minimum.
• XT humidifier recommended fill water conductivity
is 350 to 1250 μS/cm.
• No tank ground • Install tank ground.
• Fill valve stuck open • Check valve for foreign matter.
• Fill valve installed backward • Check arrow direction on valve; or ”In” should be visible on fill
valve body.
• Excessive condensate is draining into the tank • Consult DriSteem to increase the amount of water that can be
converted to steam before receiving a fault.
For XT humidifiers, see Check cylinder / high water on Page 47 of Table 45-1.
• Malfunctioning level control system • If needed, clean probes.
• Check water conductivity. Minimum conductivity for proper
operation of level control system is 30 µS/cm.
• Verify that probe wiring is correct.
Fill valve cycles on and
off frequently (several • Drain valve not fully closed • If an obstruction does not allow drain valve to fully close, clean
times per minute) valve.
• If there is a broken or weak return spring on drain valve, replace
the valve.
• Check if 24 VAC is present at valve. If so, check wiring of
Vapor‑logic control board terminal P17 (drain).
• Poor tank ground • Verify good machine ground.
Continued

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 95

 OPERATION

Troubleshooting guide

Table 96-1:
Troubleshooting guide (continued)
Issue Possible causes Actions
Unit does not fill with water. • Malfunctioning fill valve • Unplug probe head. Fill valve should open. If fill valve does not
open, verify proper 24 VAC to fill valve. If voltage is present and
valve does not open, replace valve or valve coil.
• Verify that coil is 24 VAC.
• Verify that valve stem moves freely.
• No water supply to fill valve • Check if water supply line strainer is plugged.
• Verify that manual water line shut-off valve is open and that
pressure exists.
• Check that in-line needle valve is open.
• Unit is not in Auto Mode • Change mode to Auto.
• Vapor‑logic control is in end‑of‑season • Check for humidification demand signal at control board.
drain mode
• Inlet water needle valve is closed • Check needle valve.
• Unit is in freeze protection draining • Change mode to Auto.
• Fill valve stuck in closed position • Recycle power to recycle fill valve closing and opening.
• Malfunctioning level control system • See below.
Fill valve does not close • Open drain valve • If automatic drain valve is locked in the manual open position,
reset to automatic.
• Replace valve if there is a broken return spring on the drain valve.
Filling issues

• Clean or replace drain valve if an obstruction in the valve does not

allow complete closure.
• Close manual drain valve if it is open.
• If Vapor‑logic shorted output to fill valve coil, replace board or
drain coil.
• Malfunctioning level control system • Check that probe plug is plugged in fully.
• If needed, clean probe rods.
• If water conductivity is too low (see below), add ¼-½ tab sodium
bicarbonate (i.e., Alka Seltzer) to tank or cylinder water. If this
solves the issue, you have low-conductivity water; consult DriSteem
for further advice.
– Tap/softened water GTS humidifiers and electric humidifiers with
heating elements require fill water conductivity to be 30 µS/cm
minimum.
– XT humidifier recommended fill water conductivity is 350 to
1250 μS/cm.
• Replace board if Vapor‑logic control board is defective.
• Verify that system is in auto mode.
• Verify that probe is wired correctly.
• Fill valve is stuck • Check if fill valve is installed backwards. If yes, repipe.
• If there is a faulty internal spring or diaphragm in the fill valve,
replace valve.
• Check if there is an obstruction that does not allow valve to seat
properly. Clean or replace valve as needed.
• Check for control voltage across fill valve coil. (Check wiring and
controls.)
• Install water inlet shock arrestor.
Continued

96 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Troubleshooting guide

Table 97-1:
Troubleshooting guide (continued)
Issue Possible causes Actions
Alarm: • Tank drain outlet • If the humidifier tank drain outlet is plugged, clean.
Tank not draining
• Water detection probes • Clean probe or replace probe rod assembly.
• Drain valve wiring • Check drain valve wiring.
• Check to be sure drain valve is wired to Terminal P17 (drain)
on control board.
• Reset Vapor‑logic.
• Fill valve • Check for voltage present at the valve. If present, clean or
replace valve.
• Replace fill valve if water is leaking through.
• System programmed for manual drain • Run a test cycle to see if the system activates drain output.
• Drain line backing up with water • Insufficient drain line pitch.
Draining issues

• Drain line plugged • Insufficient drain line size. See tank manual for drain piping
size and pitch requirements.
Unit does not perform • Humidifier may not have automatic drain • Inspect unit to verify that an automatic drain valve was
automatic drain sequence system, or automatic drain is disabled furnished.
• Go to Setup menu to verify that auto drain/flush is enabled.
• Drain fault, plugged drain valve, or plugged • Clean drain valve piping.
drain pipe
• Malfunctioning automatic drain sequence • Go to Setup menu and check auto drain/flush settings.
• No power to the automatic drain valve • Check if 24 VAC is present at terminal block P17 (drain) and
at drain valve.
• Defective automatic drain valve • If voltage is present at the valve and it still does not open,
replace valve.
Unit does not perform • Input signal always has a demand • Reduce demand signal.
end-of-season drain
• Vapor‑logic setup • Verify in Setup menu Vapor-logic is set for end-of-season drain.
• Drain valve • Valve not wired, or incorrectly wired, to control board.
• Check 24 VAC across valve coil during test cycle.
Continued

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 97

 OPERATION

Troubleshooting guide

Table 98-1:
Troubleshooting guide (continued)
Issue Possible causes Actions
Alarm: • Open, shorted, or incorrect wiring of sensor • Check wiring terminals for correct wiring and voltages.
Tank temperature sensor 1000 Ohms = 68 °F (20 °C); 1702 Ohms = 212 °F (100 °C).
failed • Humidifier interlock switches and/or over- • Verify that switch or thermostat is wired.
temperature thermostat • Verify interlock switch is set correctly and humidifier cover is on.
• Reset over-temperature thermostat if tripped.
Alarm: • Unit has overheated; temperature is at 25 ºF • Check for proper water level in tank.
Tank overtemp (14 ºC) over boiling temperature
• Faulty sensor • Replace sensor.
Reduced or no output Electric humidifiers: • Verify that proper voltage is being applied to heaters.
(even though water level • Heater malfunctioning • Verify heater amperage matches wiring diagram.
Heating issues

is correct) • If heater contactor is not functioning, replace.

Electric humidifiers: • Check if heater fuses are blown and replace if required.
• Malfunctioning control system • Check if auxiliary limit controls are not allowing system to
operate, e.g., duct humidistats, airflow proving switch, etc.
Reset, replace or calibrate as needed. (Airflow switch, terminal
P13 (24VAC and AFsw) measures 24 VAC if open. On-off high
limit, terminals P13 (24VDC and DHL), measures 24 VDC if
open.
• Check if the heater over-temperature thermostat has tripped.
Reset if necessary.
GTS, STS or LTS systems only: • Clean.
• Dirty heat exchanger
GTS systems only: • Clean or adjust as appropriate. See tank manual for instructions.
• Dirty burners
• Low gas pressure
Continued

98 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Troubleshooting guide

Table 99-1:
Troubleshooting guide (continued)
Issue Possible causes Actions
Heater burnout • Water level is too low • Replace probes.
• Improper wiring • Verify proper voltage applied to heater.
• Verify proper electrical connections.
• Mineral buildup on heaters • The humidifier may be undersized. Increase humidifier
capacity or replace with larger humidifier. Consult DriSteem.
• Inspect tank for severe mineral buildup on or around heater.
Increase skim duration, frequency of drain cycle, and/or
frequency of cleaning. Use softened makeup water.
• Contactors failed to open • Replace.
• SSR failed closed • Replace SSR controller.
• Heater corrosion • Inspect heater for surface corrosion or pitting. Before replacing
burned-out heater verify chloride content in supply water is
very low.
Tank does not heat up. • Over-temperature thermostat switch located • Reset thermostat switch.
under heater wiring cover tripped
• Humidifier cover interlock switch • Humidifier cover not wired; adjust interlock switch.
(Vaporstream models only)
• Combustion air switch or power vent switch • Check venting system and combustion dampers.
Heating issues

(GTS systems only) • Verify wiring and connections on switches are properly
connected.
• Incorrect or nonexistent control voltage • Check for proper supply voltage on electrical diagram.
• Verify proper transformer voltage characteristics.
• Verify proper wiring of transformer.
• Check for control circuit voltage on electrical diagram. If
voltage is not present, troubleshoot boards and wiring system
for potential short circuit.
• Incorrect or nonexistent supply voltage to the • Check main line fuse.
unit • Check main line safety switch.
• Check heater fuses and wiring diagram.
• Duct RH above high limit set point • Check for duct airflow.
• Verify operation of duct high limit switch or transmitter.
• No demand signal • Check signal by others.
• Check for miswired connection.
• Verify in the Setup menu that humidifier is configured for
demand signal.
• Humidifier is in Standby mode • Change mode to Auto.
Humidifier tank has proper • Aquastat • This is normal; the aquastat is maintaining a certain tank water
water level and is always temperature within range of 40 ºF to 180 ºF (4 ºC to 82 ºC).
warm. • Readjust aquastat temperature to a lower set point.
• SSR power controller • SSR control devices shorted closed; check/replace.
• Phase-to-phase wiring crossed.
• Contactor • Contactor shorted closed; replace.
Continued

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 99

 OPERATION

Troubleshooting guide

Table 100-1:
Troubleshooting guide (continued)
Issue Possible causes Actions
Humidity is below desired • Unit is operating but fails to meet required • Unit undersized; replace with a larger unit or add additional
level humidity level humidifier.
• Skim duration is too long.
• If drain valve does not close fully, determine the cause and
clean, repair, or replace as needed.
• If drain pipe water seal is allowing steam to go down the
drain, fill P-trap with water or repair as needed.
• If there is an improper water seal height, increase to the
recommended height (see humidifier tank manual for water
seal height).
• If there is excessive internal steam pressure, determine the
cause of the high pressure (e.g., high duct static pressure,
undersized orifices in dispersion tubes, water, or crushed
Humidity set point issues

vapor hose) and correct as required.

• Replace leaking gasket or vapor hose.
• Recalibrate if controls are out of calibration.
• If fill valve is stuck open, repair or replace.
• If zone valve will not open, repair or replace.
• Interconnecting steam piping to the dispersion assembly is too
long and/or uninsulated (do not insulate steam hose).
• No call for humidity from humidistat or from • Low or no signal strength from humidistat. Check for proper
control and high limit humidity transmitters wiring.
• Check humidity transmitters (4 to 20 mA output).
• Adjust set point if RH or dew point set point is too low.
• Excessive outside air volume • Verify proper operation of fans, dampers, VAV systems, etc.
• Heating elements not operating • Verify that humidistat is calling for humidity.
• Check for control voltage if limit controls (airflow proving
switch, zone valves, etc.) are not allowing unit to operate.
• Check fuses and replace if they are blown.
• Check if the heater over-temperature has been tripped. Reset if
necessary.
• Humidity control input type not the same as • Check Vapor‑logic control board connections P11 and P13.
Vapor‑logic firmware Consult DriSteem.
• Vapor-logic not in Auto mode • Change mode to Auto.
Continued

100 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Troubleshooting guide

Table 101-1:
Troubleshooting guide (continued)
Issue Possible causes Actions
Humidity above set point • High entering relative humidity • Dehumidify.
• Unit oversized • Consult DriSteem.
• Reduced airflow • Check fans, dampers, VAV systems, etc.
• Improperly located humidistat or humidity • Relocate, using guidelines in Appendix section of this manual.
transmitters
• Malfunctioning controls • Check for incorrect supply voltage.
• Check for incorrect control signal.
• Check for improper wiring hookup.
• If humidity controller or transmitter are out of calibration or
malfunctioning, repair or recalibrate.
• Check if SSR/contactor shorted. Repair or replace as needed.
Humidity set point issues

• Contactor/SSR is stuck closed • Remove power from humidifier immediately. Contact DriSteem.
Hunting (humidity swings • Malfunctioning control system • If there is a faulty or inaccurate humidity controller or
above and below desired set transmitter, repair or replace.
point) • Check for proper Vapor‑logic control settings: RH set point,
high limit set point, cycle rate, PID tuning, etc.
• Relocate poorly located control components. See “Sensor
placement” on Page 26.
• On SSR units: Control wire and power wires must be physically
separated from each other. If they are not, an induced control
voltage can occur, causing erratic operation.
• Verify that keypad/display modular cable is isolated from
power wiring.
• Air volume varies rapidly • Stabilize.
• Air temperature is varying rapidly • Stabilize to ±1 ºF (±1 ºC).

• P
 roportional band is too small and/or • If RH swings outside PID band, increase PID band using the
integral gain (Ki) is too large Setup menu.
• Decrease integral gain (Ki) using the Set Up menu.
• On-off control is not adequate • If controlling the humidifier with an on-off signal, consider
changing to controlling with a modulating signal.
Continued

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 101

 OPERATION

Troubleshooting guide

Table 102-1:
Troubleshooting guide (continued)
Issue Possible causes Actions
Alarm: Blocked flue • Blocked flue sensor is open • Check venting system for obstructions.
• Check air line to flue switch for obstructions.
• Windy conditions cause downdrafts in venting system. Install
a high wind vent cap or isolate as recommended by local
codes.
Alarm: Gas valve [number] • Failed ignition module • Check ignition module. Replace if necessary.
fault • Miswired gas valve • Check gas valve wiring.
Alarm: Burner [number] fault • No gas supply to unit • Verify that gas service valve is on and receiving minimum
pressure to manifold per rating plate.
• Gas valve is off or there is no power to the • Check for 24 VAC from the ignition module to the gas valve.
valve • Check that gas valve plug is seated properly.
• Broken ignitor • Verify that ignitor glows. Replace if necessary.
Gas-to-steam (GTS) humidifier issues

• Gas valve outlet pressure is too low • Verify outlet pressure is set per rating plate.

• Blower inlet is dirty or obstructed • Clean inlet and check for obstructions.
• Flame sensor not sensing flame • Check flame sensor wiring.
• Check polarity at incoming power. Switch if necessary.
•  Stray fiber from burner touching flame sensor. Use a
screwdriver to gently push down fibers near flame sensor.
• Flame sensor is cracked. Replace.
• Polarity reversed at power block • Check polarity.
Alarm: • Ignition sequence engaged without power to • Verify ignition sequence.
Ignition module [number] fault gas valve • Replace ignition module.
• Gas valve/ignite/sensing electrode is out of • Verify wire connections to these components.
sequence
Alarm: • The blower is incorrectly wired, or the • Check for proper blower wiring.
Blower [number] fault blower failed to meet demand speed • Replace blower.
Alarm: • The power venter air flow switch is open • Check for proper power vent wiring.
No power vent airflow • Repair or replace power venter.
Alarm: • The combustion air damper is open • Check for proper combustion air damper wiring.
No combustion airflow • Repair or replace damper motor.
Alarm: • Ignitor has reached 100,000 cycles and the 1. From the home screen, press the Main softkey.
Replace ignitors! humidifier has shut-off. 2. Select Setup from the next menu.
3. From the list of items, select Reset to Defaults.
4. Select Reset ign. counts?
5. Select Yes to confirm the re-set.

Humidifier will not heat • Steam stop valve closed • Verify valve is open.
Steam-to-steam (STS) humidifier issues

• Steam trap plugged • Clean trap body.

• Steam strainer plugged • Clean strainer.

Low output • Low supply steam pressure • Check steam supply pressure. Provide steam pressure as
specified on unit.
• Steam valve inoperable • Valve not opening fully. Check signal to valve.

• Steam trap blocked • Trap not passing condensate.

• Scale coated heat exchanger • Clean heat exchanger.

102 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

 OPERATION

Replacement parts

Table 103-1:
Vapor-logic replacement parts
Description Quantity Part number

Kit (includes main controller and required Molex plugs) 1 183504-004

Kit (includes main controller, 9” data cable, and required Molex plugs) (Vapormist/Humidi-tech only) 1 183504-005

Keypad/display (includes printed circuit board, LCD display screen, membrane switch, front and back of plastic
1 408495-011
cover)

27" (686 mm) 408490-014

Keypad/display communication cable (contact DriSteem for lengths other than 27" (686 mm) and 60" (1524 mm)
60" (1524 mm) 408490-009

Molex connector plug, 2-position 1 406246-002

Molex connector plug, 3-position 1 406246-003

Molex connector plug, 4-position 1 406246-004

LonTalk card 1 408642

BACnet 1 191515

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 103

 OPERATION

Replacement parts
FIGURE 104-1: VAPOR-LOGIC REPLACEMENT PARTS

Main board Keypad display

Molex connector plug (2-position shown) LonTalk card

104 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL

VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 105
106 VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL 107
WARRANTY

Expect quality from the industry leader Two-year Limited Warranty

Since 1965, DriSteem has led the industry with DRI-STEEM Corporation (“DriSteem”) warrants to the original user that its products will be free from
innovative methods for humidifying and cooling defects in materials and workmanship for a period of two (2) years after installation or twenty-
air with precise control. Our focus on ease seven (27) months from the date DriSteem ships such product, whichever date is the earlier.
of ownership is evident in the design of the
Vapor-logic controller. DriSteem also leads the If any DriSteem product is found to be defective in material or workmanship during the applicable
industry with a Two-year Limited Warranty and warranty period, DriSteem’s entire liability, and the purchaser’s sole and exclusive remedy,
optional extended warranty. shall be the repair or replacement of the defective product, or the refund of the purchase price,
at DriSteem’s election. DriSteem shall not be liable for any costs or expenses, whether direct
For more information or indirect, associated with the installation, removal or reinstallation of any defective product.
www.dristeem.com Excluded from the Limited Warranty are all consumable and wear and tear items such as cylinders,
sales@dristeem.com membranes, filters, or media replacements. These items are subject to usual wear and tear during
usage.
For the most recent product information
visit our Web site: www.dristeem.com DriSteem’s Limited Warranty shall not be effective or actionable unless there is compliance with
all installation and operating instructions furnished by DriSteem, or if the products have been
modified or altered without the written consent of DriSteem, or if such products have been subject
to accident, misuse, mishandling, tampering, negligence or improper maintenance. Any warranty
claim must be submitted to DriSteem in writing within the stated warranty period. Defective
parts may be required to be returned to DriSteem. Excluded from the Limited Warranty are all
consumable and wear and tear items such as cylinders, membranes, filters, or media replacements.
These items are subject to usual wear and tear during usage.

DriSteem’s Limited Warranty is made in lieu of, and DriSteem disclaims all other warranties,
whether express or implied, including but not limited to any IMPLIED WARRANTY OF
MERCHANTABILITY, ANY IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE, any
DRI-STEEM Corporation implied warranty arising out of a course of dealing or of performance, custom or usage of trade.
a subsidiary of Research Products Corporation
DriSteem U.S. operations are ISO 9001:2015 DriSteem SHALL NOT, UNDER ANY CIRCUMSTANCES BE LIABLE FOR ANY DIRECT, INDIRECT,
certified INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, LOSS OF PROFITS, REVENUE OR BUSINESS) OR DAMAGE OR INJURY TO PERSONS OR
U.S. Headquarters: PROPERTY IN ANY WAY RELATED TO THE MANUFACTURE OR THE USE OF ITS PRODUCTS. The
14949 Technology Drive exclusion applies regardless of whether such damages are sought based on breach of warranty,
Eden Prairie, MN 55344 breach of contract, negligence, strict liability in tort, or any other legal theory, even if DriSteem has
800-328-4447 or 952-949-2415 notice of the possibility of such damages.
952-229-3200 (fax)
By purchasing DriSteem’s products, the purchaser agrees to the terms and conditions of this Limited
European office: Warranty.
Grote Hellekensstraat 54 b
B-3520 Zonhoven
Belgium Extended warranty
+3211823595 The original user may extend the term of the DriSteem Limited Warranty for a limited number of
E-mail: dristeem-europe@dristeem.com months past the initial applicable warranty period and term provided in the first paragraph of this
Limited Warranty. All the terms and conditions of the Limited Warranty during the initial applicable
Continuous product improvement is a policy of warranty period and term shall apply during any extended term. An extended warranty term of
DriSteem; therefore, product features and an additional twelve (12) months or twenty four (24) months of coverage may be purchased. The
specifications are subject to change without extended warranty term may be purchased until eighteen (18) months after the product is shipped,
notice. after which time no extended warranties are available. When a Dristeem humidifier is purchased
with a DriSteem RO system, an extended twenty-four (24) month coverage is included.
DriSteem, Vaporstream, Vapormist, and
Vapor-logic are registered trademarks of Any extension of the Limited Warranty under this program must be in writing, signed by DriSteem,
Research Products Corporation and are filed and paid for in full by the purchaser.
for trademark registration in Canada and the
European community.

Product and corporate names used in this

document may be trademarks or registered
trademarks. They are used for explanation only
without intent to infringe.

© 2021 Research Products Corporation

Firmware Version 6.X.X

Form No. VL6-IOM-EN-0121
Part No. 890000-741 Rev G