T6862 Series Large LCD Digital Thermostat

Time Programmable
2-pipe/4-pipe fan coil control
Data sheet

Features
• S uper modern appearance design, suitable for
office, hotel and residential building
• Programmable based on 4 periods a day, 7 days a
week.
• Horizontal and vertical model available for variant
application
• Slim design, direct installation on 86 size box
• Stylish and elegant blue/green backlight with blue/
green colour ring
• 2-pipe/4-pipe integrated into one unit with easy
configuration
• Big LCD display with English and icons
Application • Easy to install and set-up
T6862 digital thermostats are designed for • Real time clock
application of 3-speed fan and valves in fan coil • Selectable room temperature or setpoint display
system. • Manual or automatic fan speed selection
Including: • Remote temperature sensor
• Energy saving mode activation by button press or
2-pipe cool only/heat only/manual changeover and
dry contact (key card)
4-pipe manual or automatic changeover
• Cycle per Hour (CPH) function
Ventilation mode
• Adjustment of display room temperature
Manual or automatic 3-speed fan control
• Temperature unit either oC or oF
Water valve control
• User setting can be kept when power off
Fan speed can be selected to automatic or manual • Freezing protection function available
3-speed control mode. • Lock or unlock keys or part of keys in Installer Set-
In ventilation mode, fan only support manual speed up
control. • Heat and cool setpoint limitation for energy saving

Model summary
Horizontal/ Time 2-pipe/ Power supply Energy Manual/ Remote
Model Backlight Color Ring Ventilation
Vertical program 4-pipe （V） Saving Automatic Fan Sensor
T6862H2WB Horizontal Blue White Y 2/4 220 Y Y Y Y
T6862V2WB Vertical Blue White Y 2/4 220 Y Y Y Y
T6862H2WG Horizontal Green White Y 2/4 220 Y Y Y Y
T6862V2WG Vertical Green White Y 2/4 220 Y Y Y Y
T6862H1WB Horizontal Blue White Y 2/4 110 Y Y Y Y
T6862V1WB Vertical Blue White Y 2/4 110 Y Y Y Y
T6862H1WG Horizontal Green White Y 2/4 110 Y Y Y Y
T6862V1WG Vertical Green White Y 2/4 110 Y Y Y Y
Note: Horizontal models are taken as samples for display, operation and installation pictures shown in below parts.

APH07CH04 - R2001EN


 Mechanical design Fan can be selected as manual or automatic
3-speed operation. In Manual mode, the fan
Thermostat appearnce is switched to the selected speed via control
DIGITAL DISPLAY
output Gh, Gm, Gl. While in automatic mode, fan
speed depends on the difference between room
FAN BUTTON temperature and setpoint. When room temperature
UP BUTTON
reaches setpoint, valve will be closed and
POWER BUTTON SETTING BUTTON meanwhile, fan will be closed either.

MODE BUTTON
DOWN BUTTON
Fan speed is high or off

Difference between RT and SP

COOL
4F
LCD display Fan speed is medium or off
DAY
2F
CLOCK
OPERATION TIPS INDICATES THE SETPOINT
Fan speed is low or off
INDICATES THE INSTALLER SETUP
Setpoint
INDICATES THE INSTALLER TEST Fan speed is low or off
INDICATES THE
CURRENT FAN SETPOINTIS FOR -2F
SETTING COOL OR HEAT
INDICATES TEMPORARY Fan speed is medium or off
INDICATES
WORK STATE
THERMOSTAT
IS OFF INDICATES HOLD WORK -4F

HEAT
STATE
INDICATES
CURRENT
INDICATES HOLD WORK STATE Fan speed is high or off
SET MENU
TEMPERATURE
INFORMATION
CURRENT DAY
MODE CLOCK
SETTING SCHEDULE

INDICATES THERMOSTAT CURRENT Fan speed ramping control algorithm

IS CALLING FOR HEAT KEYPAD OPERATION INDICATES SCHEDULE
OR COOL LOCK TIPS THERMOSTRAT
IS IN FREEZING
PROTECTION
MODE Four-pipe application
System will have a fixed deadband set in ISU
Function between heating and cooling setpoints for Automatic
Valve control Change Over (ACO) configured thermostats.While
Thermostat acquires the room temperature via its the heating and cooling set points determine the
integrated sensor or external temperature sensor dead band.
and maintains the setpoint by delivering on/off valve
control commands output. If the difference between heating and cooling
set points is less than the dead band set in ISU,
then the dead band set in ISU is enforced. When
adjusting the cooling set point, conflicts will be
resolved by moving the heating set point out
of the way of the cooling set point (heating set
point=cooling set point –dead band set in ISU).
When adjusting the heating setpoint, conflicts will
be resolved by moving the cooling set point out
of the way of the heating set point (cooling set
PRESS THE MODE BUTTON TO SELECT point=heating set point +dead band set in ISU).
HEAT, COOL, AUTO OR VENT
Heating and Cooling range stops will determine the
Fan Operation maximum heating setpoint setting and minimum
cooling setpoint setting.

+1/2 Deadband Cooling Setpoint

Dead band

-1/2 Deadband Heating Setpoint

4 pipes auto change over setpoint algorithm

The last system control mode used will determine

PRESS THE FAN BUTTON TO SELECT LOW,
MED, HIGH OR AUTO the mode in ACO when in the deadband.

APH07CH04 - R2001EN


Temperature display Operating modes
The displayed temperature can be set to acquired The following operating modes are available:
room temperature or setpoint. The setting can be
made during Installer Set-Up process. Comfort mode
Room temperature and scetornt can be displayed In comfort mode, the setpoint can be changed by
simultaneously. pressing up and down button. Different applications
include cool only, heat only and manual heat/cool
Cycle per hour (CPH) changeover.
In order to get a more accurate temperature control,
CPH function may enable the thermostat to open TEMPERATURE
the valve for several times per hour even the SETTING
PRESS THIS BUTTON TO
temperature is close to setpoint (difference less RAISE THE TEMPERATURE
than ½ P-band). The default value is 4 for heating SETTING

and 3 for cooling and can be changed in Installer

Set-Up process.

Time Programmable
Temperature setpoint can be adjusted in different PRESS THIS BUTTON TO
value in each period within each day. Altogether 4 LOWER THE TEMPERATURE
SETTING
periods in one day and the temperature can be set
respectively from Monday to Sunday. For default Ventilation mode
setting and detailed operation information, please Press mode button to enter ventilation mode. In
refer to operation manual of T6862. ventilation mode, no output for valve while the fan
will operate according to selected fan speed.

Energy saving mode

A potential-free dry contact (such as hotel key
card) or button press (pressing mode button for
continuous 3 seconds) can activate the energy
saving mode with icon appearing on screen.
The dry contact can be selected as normal open or
normal close type in ISU.
If activated by dry contact, all buttons will be locked
except the multi-key for ISU. If energy saving is
activated by button press, then any following button
press will stop energy saving mode.
Backlight
Any key press will activate the backlight. Backlights For heating mode, if the energy saving function is
will timeout 8 seconds after last key press. When enabled, the setpoint will change to remote setback
in Installer Set-up and Installer test mode, the heating setpoint. The range of remote setback
backlight will timeout 60 seconds after last key heating setpoint is from 10oC to 21oC and default
press. value is 18oC. The value may change in ISU with
step of 0.5oC.
Remote temperature sensor For cooling mode, if the energy saving function is
T6861 provides control either depending on the enabled, the setpoint will change to remote setback
acquired room temperature or depends on the cooling setpoint. The range of remote setback
return air temperature. The model of remote cooling setpoint is from 22oC to 32oC and default
temperature sensor is (NTC20K). value is 26oC. The value may change in ISU with
step of 0.5oC.
Keypad lock
Keypad lock can be set in ISU with default status
is all keys available. You may change into mode
button locked out. Fan, Set and Mode buttons
locked out and All buttons locked out by changing
the ISU.

APH07CH04 - R2001EN


 Freezing protection mode Terminal Designations
Freezing protection can be selected as disabled
(default) or enabled. In freezing protection mode Item Terminal Description
(no such mode in cool only application), when 1 Cc Cooling close
thermostat is in OFF mode while the acquired
temperature is below 6oC, the thermostat will start 2 Y Cooling open
heat mode until the temperature rises to 8oC or the 3 L AC Power
thermostat is turned on.
4 Ch/Cc Heating close/Cooling close

5 W/Y Heating open/Cooling open

6 N AC Ground

7 Gh High speed fan relay

8 Gm Medium speed fan relay

9 Gl Low speed fan relay

10 Sc Ground for remote sensor and remote setback

11 RSB Remote set back

12 Rs Remote sensor
On/off mode
Pressing power button can switch between on and
off mode.
Wiring diagrams
Application 1: 2 pipes heat only wiring diagram

3 L
4

5 Heat valve

INDICATES THERMOSTAT 6 N
HAS BEEN SET TIME OFF 7

Technical specification
8 Fan
9

Power supply 110 (+/-10%) VAC, 220(+10%, 10

-15%)VAC 11

Frequency 50/60Hz 12
Remote Setback
Remote Sensor
Control algorithm PI, On/off output
Accuracy +/-1oC at 21oC Typical wiring for ON/OFF control in 2 pipe heating
only (VC4013)
Rating capacity For 220V power supply:
4(2)A for fan load, 2(1)A for zone
valve 1 1

For 110V power supply: 2 2

L
4(2)A for fan load, 2(1)A for zone 3 3

valve 4 4
Heat valve
5 5
Cycle times 100,000 times 6 6 N
Setpoint range 10~32oC 7 7

Display range 0~37oC 8 8 Fan

Installation Installed on 86×86mm junction 9 9

box or US2×4 inch. 1010

Protection Class IP20 1111

Remote Setback
Environmental Operation temperature -18~49oC 1212
Remote Sensor
Conditions Shipping temperature -35~65oC
Typical wiring for ON/OFF control in 2 pipe heating
Relative humidity 5~90% only (VC6013)

APH07CH04 - R2001EN


Application 2: 2 pipes Cool only wiring diagram Application 4: 4 pipes 1stage Heat and 1 stage Cool
1 1
MCO/ACO wiring diagram
2 2 1 1

3 3 L 2 2 Cool valve

4 4 3 3 L
5 5 Cool valve 4 4

6 6 N 5 5 Heat valve

7 7 6 6 N
8 8 Fan 7 7

9 9 8 8 Fan
1010 9 9

1111 1010
Remote Setback
1212 1111
Remote Sensor Remote Setback
1212
Typical w iring for ON/OFF c ontrol i n 2 p ipe c ooling Remote Sensor
only (VC4013) c
Typical wiring for ON/OFF ontrol in 4 p ipe
1H/1C Auto/ Manual Change over (VC4013)

1 1
1 1
2 2 Cool valve
2 2
3 3 L L
3 3
4 4
4 4
Cool valve
5 5 Heat valve
5 5
6 6 N 6 6 N
7 7
7 7

8 8 Fan 8 8 Fan
9 9
9 9

1010
1010

1111 1111
Remote Setback
1212
Remote Setback
1212
Remote Sensor
Remote Sensor
Typical wiring f or O N/OFF control i n 2 p ipe c ooling Typical wiring f or 3 -wire control in 4 p ipe 1H/1C
only (VC6013) Auto/ Manual Change over (VC6013)

Application 3: 2 pipes 1 stage Heat or 1 stage Cool

MCO wiring diagram Installation & Commissioning
1 Pull wires through wire hole.
1 1

2 2
Loosen screw terminals, insert wires into terminal
3 3 L block, then retighten screws.
4 4

5 5 valve

6 6 N
7 7

8 8 Fan
9 9

1010

1111
Remote Setback
1212
Remote Sensor
Typical
Typical wiring
wiringfor
forON/OFF
ON/OFFcontrol
controlin in
2 pipe heating
2 pipe 1H1C
only (VC4013)
(VC4013)

1 1

2 2
2 Push the Power box into the junction box.
3 3 L
4 4
valve
5 5

6 6 N
7 7

8 8 Fan
9 9

1010

1111
Remote Setback
1212
Remote Sensor
Typical
Typical wiring
wiringfor
forON/OFF
ON/OFFcontrol
controlin in
2 pipe heating
2 pipe 1H1C
(VC6013)
only (VC6013)

APH07CH04 - R2001EN


 Back cover installation Installer system test
Install the thermostat about 5 feet (1.5m) above the After completing the installer setup above, press the
floor in an area with good air circulation at average button again to begin a system test
temperature. Follow the procedure below to test the heating and
cooling and fan system.

System test No.

System

Press and hold and buttons 3 seconds to enter

Do not install in locations where the thermostat can
test mode.
be affected by:
Press or button to change system status.
• Drafts or dead spots behind doors and in corners
Press button to advance to next test number.
• Hot or cold air from ducts
Press and button simultaneously to terminate
• Sunlight or radiant heat from appliances
system test at any time.
• Concealed pipes or chimneys
• Unheated/uncooled areas such as an outside wall
behind the thermostat System Test System Status
1 Place Back cover over junction box, insert and 10 Heat 0 Heat turn off.
tighten mounting screws. 1 Heat turns on.
30 Cool 0 Cool off.
1 Cool on.
40 Fan 0 Fan off
1 Low speed Fan on
2 Medium speed Fan on
3 High speed Fan on
60 Display Run days
70 Thermostat information(for reference only)
71 Software revision number (major)
72 Software revision number (minor)
2 Insert the cable into connector on circuit board of 73 Configuration identification code (major)
thermostat. 74 Configuration identification code (minor)
75 Production configuration date code (week)
76 Production configuration date code (year)

Installer Set-Up (ISU) setting

Press and simultaneously for 3 seconds to
enter ISU as below:

3 Align 4 tabs on the Back cover with corresponding

Number
slots on the back of the thermostat, and then push
it until the thermostat snaps in place.
Setting

Press or to change settings

Press to advance to next function
Press and buttons simultaneously for 3
seconds to exit and save settings

APH07CH04 - R2001EN


Setup Function Settings & Options Troubleshooting Tips
ISU Code Description Possible Options If… Then…
0 Heat only
♦S et the mode to Heat by pressing the Mode button.
1 Cool only
♦C heck that the heat temperature setting is set above the
1 System type 2 Two pipes 1H1C manual(Default) Heating system
room temperature and “Heat On” shows solidly in the
4 Four pipes manual does not turn on.
display.
5 Four pipes (Default) auto ♦ Wait five minutes for the heating system to respond.
0 Onboard Sensor (Default)
5 Remote sensor 1 Remote （NTC20K, T7770A1006, same as pipe ♦S et the mode to Cool by pressing the Mode button.
sensor） ♦C heck that the cool temperature setting is set below the
Cooling system
room temperature and “Cool On” shows solidly in the
Temperature 0 ºF does not turn on.
9 display.
scale 1 ºC(Default) ♦ Wait five minutes for the cooling system to respond.
0 CYCLE ONLY (Default)
Auto has fan ramping algorithm The fan doesn’t ♦C
 heck whether the Fan mode is set to Auto
1 CONSTANT ONLY work. ♦C
 heck whether the heating or cooling system works.
10 Fan control type
(3 speed: Low->Med->High-> Low) ♦C heck whether the keypad is locked or not.
2 User can choose Cycle or Constant (Default) The Mode
♦C heck whether the system is working in Energy saving
(3 speed: Low->Med->High->Auto->Low) button doesn’t
mode.
work.
1 ºC (2 ºF) ♦ Check whether the thermostat is off.
1.5 ºC (3 ºF)(Default)
♦C heck whether the keypad is locked or not.
2 ºC (4 ºF) The Fan button ♦C heck whether the system is working in Energy saving
Sequence Dead
2.5 ºC (5 ºF) doesn’t work. mode.
12 band for four
3 ºC (6 ºF) ♦ Check whether the thermostat is off.
pipes
3.5 ºC (7 ºF)
♦Check whether the keypad is locked or not.
4 ºC (8 ºF) The Up or
♦ Check
 whether the system is working in Energy saving
4.5 ºC (9 ºF) Down button
mode.
1 doesn’t work.
♦ Check whether the thermostat is off.
2
3
4 (Default)
5
CPH value for 6
13
Heat 7 Dimension
8
9
10
11 119.6
12
1
2
CPH value for 3(Default)
14 95
Cool 4
5
6
-2 ºC(－4 ºF)
-1.5 ºC(－3 ºF)
-1 ºC(－2 ºF)
Display -0.5 ºC(－1 ºF) 16.8
18 Temperature 0 ºC(0 ºF )(Default)
adjustment 0.5 ºC(1 ºF) Horizontal model
1 ºC(2 ºF)
1.5 ºC(3 ºF)
2 ºC(4 ºF)
0 Display Room Temperature
Temperature 95
19 1 Display Setpoint
Display mode
2 Display both (Default)
Heating Range
20 10-32 ºC default 32 ºC (50-90 ºF default 90 ºF)
Stops
Cooling Range
21 10-32 ºC default 10 ºC (50-90 ºF default 50 ºF)
Stops
0 All keys available(Default)
22 Keypad Lockout
1 System button Locked out 119.6
2 Fan ,Set and System button Locked out
3 All buttons locked out
0 Hotel card NO
Remote setback
23 1 Hotel Card NC
enable method
2 Disabled (Default)
Remote setback Range 10-21ºC Default : 18 ºC
24
heating setpoint (Range 50-70ºF Default : 64 ºF)
25
Remote setback Range 22-32ºC Default : 26 ºC 16.8
cooling setpoint (Range 72-90 ºF Default : 79 ºF)
0 Disabled
27
Freeze
Protection 1 Enabled
Vertical model
0 12 hour (default)
28 Time format
1 24 hour
Run Days 0 Disabled
29
Record 1 Enabled

APH07CH04 - R2001EN