RCS

Model TR40
Communicating Thermostat
with RS485 Communications

Installation and Operation Manual

Rev P HVAC Control Unit

DCN: 141-01080
Revision 16

Date: 12/20/05

This manual applies to these TR40 Revisions or later

Model Rev Part Number Firmware Version

TR40 Thermostat P 001-01080-28
TS40 Wall Display Unit D 001-01060-26 3.07.4
HFR HVAC Control Unit P 001-01430-01 3.05.2

*** IMPORTANT NOTICE ***

DO NOT USE THIS PRODUCT FOR BUILDING FREEZE PROTECTION! YOU ARE ADVISED TO
INSTALL A MECHANICAL FREEZE PROTECTION DEVICE ON YOUR SYSTEM FOR THIS PURPOSE.

Residential Control Systems Inc.

 TR40 OPERATION

The TR40 Thermostat provides typical thermostat functions as well as the capability to send and receive
information via serial communications. This communications capability allows the thermostat’s setpoint,
mode and fan operation to be changed remotely. In addition, the remote systems can request status of
the thermostat’s temperature, setpoints, modes, and other system information.

The thermostat consists of two parts, a Wall Display Unit (WDU) and a HVAC Control Unit. The Wall
Display Unit looks like a traditional thermostat and is the wall mounted user interface for the TR40. It
provides display, control pushbuttons, and the temperature sensor. The WDU connects to the Control
Unit by a 4 wire cable. The Control Unit connects to the HVAC system in place of a standard thermostat
and provides thermostatic control of the system. In addition, the Control Unit sends and receives data and
commands via a twisted pair serial communications connection for remote control of the system.

The Model TR40 can be used with up to 3 remote temperature sensors such as the RS15.

TR40 Wall Display Unit

The TR40 WDU is a Model TS40 and has a backlit LCD graphical display, control buttons, LEDs and a
digital temperature sensor. The WDU can display multiple screens. In the default thermostat screen, it
shows the current temperature, setpoint, mode and manual fan mode, time, outside temperature and other
information.

Any changes in temperature, or control button operations, are transmitted to the Control Unit. Updates
are received from the Control Unit and displayed by the WDU.

Model TS40 Wall Display Unit

10:25 Outside 60
Sys Off
76 H Setpoint
Indicator LEDs Econ
Run
No Msg
75 74 C
Up/Down
Buttons
MENU MODE FAN RUN

On-screen
dynamic labels Heat (H) and
Cool (C)
Setpoints
Function Control Buttons
TS40 Wall Display Unit Display
The TS40 display is a graphical LCD display capable of both text and graphics. The WDU has multiple
display “screens”. The main screen is the thermostat screen shown above. This screen has a
“minimized” mode in which only the temperature is displayed. It reverts to this minimized mode after a
timeout delay period.

Other standard screens are selected by the Menu button and include: Messages, Schedules, User
Settings, and Thermostat Info. Others may be present and selectable from the menu button in special
versions of the WDU.

The TR40’s LCD features a backlit display for low light and night visibility. It can be set to remain on
constant or to turn out after a 20-45 second delay.
DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 2
 OPERATION

Wall display Unit Control Buttons

All 6 buttons on the TS40 Wall Display Unit are “Soft Keys” meaning that they change functions when you
change screens. The function of the buttons is defined by “on-screen labels” that are dynamic and change
when you change screens. The following are definitions for the buttons for the main “Thermostat screen”
and their primary mode of operation. Other screens and their button operations are defined in following
sections.

Wall Display Unit LEDs

The TS40 has four LED’s that display various status information. The LEDs have dynamic “on-screen”
labels that can change with the screen being displayed.

Wall Display Unit “Screens”

One of the unique features of the TS40 WDU graphical display is the ability to have multiple display
screens. In addition to a main thermostat control screen, menus and other control screens for special
functions are provided. This makes an intuitive and easy to use “user interface”. It allows the many
functions of the TR40 to be easily navigated.

The TS40’s main screen is the Thermostat Control Screen. From this screen you can access a menu
screen that will list other control screens or setup screens.

Thermostat Control Screen

This is the default main screen and the only screen needed for basic thermostat operation (temperature
setting and heat/cool mode selection). All other screens will automatically timeout and return this screen
after 120 seconds of no activity.

Minimized Thermostat Screen

The main thermostat screen will go to a “minimized” screen after a 30 second timeout period. This
presents a simple uncluttered display of the current room temperature and outside temperature (if an OT
sensor is attached). This minimized screen can be disabled if desired.

Pressing any button when the minimized screen is displayed will causes the Thermostat Control screen to
be restored and displayed.

Menu Selection Screen

Pressing the Menu button on the Thermostat Control Screen will go to the Menu Selection screen. This
screen presents a list of the other functions or setup screens that can be selected.

Messages Screen
The TS40 is capable of receiving messages from the RS485 network. Messages received are displayed
in the Messages Screen.

Schedules Screen
This screen is used to setup and select setback schedules for the thermostat.

User Settings Screen

This screen is a submenu of user settings for the initial setup of the thermostat. You can set the clock,
minimized screen timeout, Fahrenheit or Centigrade selection, sensor calibration and display settings.

Thermostat Info Screen

This is a quick reference list of the thermostat firmware versions and setup.

The following describes each Thermostat screen in detail.

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 3

 Thermostat Control Screen

10:25 Outside 60
1 Sys Off
76 H
2
3
4
Economy
Run
No Msg
75 74 C
MENU MODE FAN RUN

The thermostat control screen is the default display screen and is the screen that is normally displayed on
the Wall Display Unit. It can be set to switch to a minimized screen of only room temperature after a few
seconds of display. The User Settings menu allows selecting the screen timeout for a minimized screen.
Pressing ANY button will bring this screen back from a minimized screen.

Temperature Display
The WDU will normally display the current temperature from the internal digital temperature sensor or a
remote sensor. The sensors have an accuracy of +/- 1°F(+/- .5°C). The WDU will display temperatures
from -63°F to 191°F. NOTE: If averaging remote sensors are attached, the display will show the
average temperature of all attached averaging sensors.

Setpoint Display

The heating and cooling setpoints are displayed next to the Setpoint Up/Down buttons. In the HEAT
mode, the Up/Down buttons change the heat setpoint. In the COOL mode, they change the cooling
setpoint. When in AUTO mode, the buttons change the last call’s heating or cooling setpoint. Note that
the setpoints will “push” each other if they are adjusted to get within the minimum Heat/Cool separation
(delta T) setting. This is normally 3 degrees.

Clock Display
The current time is displayed in the upper left corner of the main screen. Set the clock from the User
Settings Menu.

Outside Temperature Display

The outside temperature is displayed in the top center of the main screen, if outside temperature
information has been sent to the thermostat or a remote outside temperature sensor is connected to the
WDU.

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 4

 Thermostat Control Screen

Thermostat Control Screen Buttons

Thermostat Control Screen - UP and DOWN Buttons

The UP and DOWN buttons adjust the setpoint temperature.

Pressing the UP button will increment the setpoint value by one
degree and conversely, pressing the Down button will decrement
the setpoint one degree. Pressing and holding a button down
will cause the setpoint to continuously change until the button is
released.

The setpoints can be set from 40°F to 106°F ( 5°C to 37°C), unless limited in the Installer Settings.

Setpoint Push: Note that you cannot lower the cooling setpoint below the heating setpoint. The
thermostat will “push” the heating setpoint lower if try to lower the cooling below the heating setpoint. It
maintains a 3 degree separation between the heating and cooling setpoint. The same is true for raising
the heating setpoint above the cooling setpoint. Again the thermostat will “push” the cooling setpoint up to
maintain the 3 degree separation.

Thermostat Control Screen - MENU Button

The Menu button changes the screen display to the MAIN MENU screen which show what other functions
are available on the Thermostat. These are dynamic and can change with the version of the thermostat
you have, but the standard ones include:

Main Thermostat Screen

Menu Button OFF AUTO
‰ Main Menu Screen
MENU MODE FAN RUN
ƒ Messages
ƒ Schedules
ƒ User Settings
ƒ Thermostat Info

Thermostat Control Screen - MODE Button

The MODE button controls the HVAC system mode. The current mode selected is displayed above the
button. Pressing the MODE button will cause the mode and display to change to the next mode. The
system mode cycles from Off to Heat to Cool to Auto and back to Off again with each press of the MODE
button. When the HVAC system type is set to Heat Pump, the mode selection will include EH for
Emergency Heat mode.

Mode Button OFF AUTO

MENU MODE
ƒ Off FAN RUN
ƒ Heat
ƒ Cool
ƒ Auto
ƒ EH

Off Mode: System is off. No heating or cooling will come on. If it was on, the system will turn off.

Heat Mode: Only heating will occur.

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 5
 Thermostat Control Screen
Mode Button Continued

Cool Mode: Only cooling will occur.

Auto Mode: Heating or cooling will come on according to the heating and cooling setpoints. The
system will automatically switch between heating and cooling when the temperature exceeds the
appropriate setpoints.

EH Mode: Only displayed when Heat Pump HVAC System type is selected. When there is a
compressor failure with the heat pump system, setting the mode to EH will allow the supplemental
heat to come on whenever there is a heat call to provide heating. It also disables the compressor
outputs to prevent further damage to the system.

Thermostat Control Screen - FAN Button

The FAN button controls the HVAC system’s MANUAL fan. The current manual fan mode is displayed
above the button. Normally this button is in the Auto mode (the system fan is automatically controlled by
HVAC system). Pressing the FAN button once will turn the manual fan operation ON. Pressing it again will
turn the manual fan OFF and return to the AUTO mode (which means OFF unless turned on by the
furnace or AC). Changes in the fan mode are sent to the Control Unit.

OFF AUTO
Fan Button MENU MODE FAN RUN
ƒ Auto
ƒ On

Thermostat Control Screen - RUN/HOLD Button

The RUN/HOLD button controls the automatic SCHEDULE operation. In the HOLD mode, the current
temperature is maintained until changed by manual or remote network command. In the Run mode, the
schedule loaded into the thermostat is activated and setpoints will change according to the schedule and
the time and day of week. There is also an AWAY mode that you can select if you press and hold the
button for 3 seconds. In the Away mode, preset Heating and Cooling setpoints are used.

Run Button OFF AUTO

ƒ Run MENU MODE FAN RUN
ƒ Hold
ƒ Away
(Press and hold button)

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 6

 Thermostat Control Screen

Thermostat Control Screen - LED Displays

The Thermostat Control Screen has the following LED labels and descriptions, numbered from top to
bottom, 1-4.

o LED 1 Green: System Operation display.

o LED Off, “SYS OFF” displayed > HVAC system is OFF
o LED Off, “SYS MOT” displayed > Minimum Off Time (MOT) delay on is active
o LED On, “SYS ON” displayed > HVAC System is running
o LED On, “SYS MRT” displayed > Minimum Run Time (MRT) delay off is active

o LED 2 Green: System Economy Mode display

o LED OFF or On, “Econ” displayed > Economy or 1st stage heating or cooling only
o LED On, “2nd Stg” displayed > Stage 2 heating or cooling is active
o LED On, “3rd Stg” displayed > Stage 3 heating is active
o LED On, “Vent” displayed > fresh air venting is active

o LED 3 Green: Run/Hold display. Shows state of Schedule Run/Hold Mode.

o LED Off, “Run” displayed > Schedule is running
o LED On, “Hold” displayed > Schedule is off, temperature setpoint hold in effect.

o LED 4 RED: Alert LED. Used for Messaging and other system alerts
o LED Off, “No Msg” displayed > No text messages or Alerts present
o LED On, Mail icon or Alert Text displayed > Message waiting or specific alert text

“Communications Error” Display

If the WDU is not properly wired or if communications to the Control Unit is interrupted, the LCD display
will flash “Comm Failure” at the top center of the Thermostat Control Screen (where outside temperature is
normally displayed) . Momentary display of “Communications Failure” caused by loss of data, will clear
automatically when data communication is restored. If the “Communications Failure” display stays on,
check wiring or control unit for problems.

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 7

 Main Menu Screen
The Thermostat has a menu tree that can be accessed by pressing the “Menu” button on the Main
Thermostat screen. Various configurations of the TS40 can have different screen contents. The first
screen that will come up is the Main Menu screen. This is a list of the other menus or functions that can
be accessed. Standard screens are listed below. Yours may vary with different configuration or revisions.

Message Screen
This is a text messaging subsystem that allows message of up to 80 characters to be sent to the
thermostat. Message that are received are displayed when the message screen is selected.

Schedules Screen
This screen is used to set the programmable setback schedules of the thermostat.

User Settings Screen

This screen is used to set the Clock, Screen Timeout, F/C mode and Sensor Calibration and
Backlight/Display settings.

Thermostat Info Screen

This screen shows the firmware versions of the WDU and Control Unit, HVAC system type and equipment
options, and the network address of the thermostat.

Main Menu Screen

Menu Selection
Messages
Schedules
User Settings
Thermostat Info

Done Select

Screen navigation buttons:

Done
Return to Thermostat Screen
Move menu selection pointer up
Not used

Not used
Move menu selection pointer down
Select Select menu item at pointer

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 8

 Main Menu > Messages

The TS40 Message Screen allows you to retrieve text messages sent from the serial network to the
thermostat. The message screen features navigation buttons to read new and old messages and delete
them.

Up to 16 messages can be stored in the thermostat, if more than 16 messages are received, the oldest is
erased to make room for the newest message. New messages will turn on and flash the Message LED
and Mail Icon in the main thermostat screen.

Viewing messages makes them “old” and turns off the indicators. If you view some, but not all new
messages, the new message notification LED and icon will stay on. Messages are entered as most recent
message as number 1 message.

Message Screen

Messages

Message 1 10/14 5:35 PM

The TR40 can receive 16 text
messages, each up to 80 characters
long. They are date/timed stamped.

Done Del Prev Next

Screen navigation buttons:

When you first select the Message Screen, the most recently received message will be displayed as
Message 1. If other messages are stored in memory, they can be recalled and viewed or deleted by using
the message memory navigation buttons.

Done Return to Main Menu Screen

Del Delete the Message being displayed

Prev Display previous message. Scroll up in message stack

Display next message. Scroll down in the message stack

Next

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 9

 Main Menu > Schedules

The Schedules Screen allows you to review and set the setback schedule for the thermostat. The TR40
has a 4 x 7 schedule. Four times a day can be selected for Heating and Cooling setpoints. Each day of
the week can have a different schedule. Groups of days can be copied with the same schedule. When
the TR40 is set to “Run” mode, the schedule will be executed daily, with the setpoints being changed as
per that days schedule stored in the thermostat. “Hold” mode stops schedule operation and holds the
current setpoints until changed manually or by network commands.

The Schedules Screen gives you the option of setting a custom setback schedule or to load one of two
preset schedules.

Menu Options

• Heat and Cool: You can change the individual day/hour and setpoints for the Heating and
Cooling schedule by selecting this menu item.

• Preset: Comfort: This is a preset schedule with mild setbacks. Select this menu item to load the
Comfort schedule into the thermostat.

• Preset: EnergyMiser: This is a preset schedule with deeper setbacks. Select this menu item to
load the Energymiser schedule into the thermostat.

Schedules Screen

Select Schedule

Heat and Cool

Preset: Comfort
Preset: EnergyMiser

Done Select

Screen navigation buttons:

Done Return to Main Menu Screen

Move menu selection pointer up

Move menu selection pointer down

Select Select the schedule to view or modify

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 10

 Main Menu > Schedules > Heat and Cool Schedule Screen
When you select the Heat and Cool Schedule menu item, the Schedule programming screen opens and
the schedule for current day will be displayed. Use the scroll buttons to highlight the data to be modified.
Once the data has been highlighted, use the +/- buttons to change the value of the data.

To copy a days schedule to another or group of days, move the cursor to “c” on the bottom right of the
schedule screen. When you highlight “c”, the button below will become “Copy”. Press this button to
change to the Copy Schedule Screen.

Schedule Screen

Monday Schedule
Time Heat Cool
Morn 6:00 A 72 82 +
Day 9:00 A 68 84
Eve 5:00 P 74 76 _
Nite 10:00 P 70 78 c

Done Next

Screen navigation buttons:

Done Return to Main Menu Screen

+ Increment time or temperature
Scroll Back

Scroll Forward
- Decrement time or temperature
Next Select the next Day schedule

Copy OR if the copy “c” is selected, go to

copy schedule screen.

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 11

 Main Menu > Schedules > Heat and Cool > Copy Schedule

The Copy Schedule screen is a sub screen of the Schedule screen. The Copy Schedule screen allows
you to copy a day’s schedule to another day or group of days.

First select the day to be copied in the Schedule screen. Scroll to the “c” at the bottom of the Schedule
screen to highlight it. The “Next” button will change to the “Copy” button. Press the “Copy” button to open
the Copy Schedule screen.

Scroll through the days and select the days the schedule is to be copied to by setting the “N” under each
day to “Y” by using the Yes/No buttons.

After selecting all the days desired, press the “Copy” button.

Exit the Copy Schedule screen with the “Back” button.

Copy Schedule Screen

Copy Monday Schedule

to
Yes
Sun Tue Wed Thu Fri Sat
N Y Y Y Y N No

Back Copy

Screen navigation buttons:

Back
Return to Schedule Screen
Yes - Copy schedule to this day
Move back with selection bar

Move forward with selection bar

No - Do not copy to this day
Copy Copy the schedule to the selected days

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 12

 Main Menu > User Settings

The User Settings screen allows you to set or change various user options of the thermostat such as the
clock, Minimized Screen timeout, Fahrenheit/Celsius mode, sensor calibrations, and backlight settings.

Menu options:

• Set Clock
Select this menu item to go to the Clock setting screen.

• Screen Timeout
Select the Screen Timeout time in seconds. Options are 0 or 15 to 127 (default set to 30 seconds).
This is the time before any screen reverts to the Minimized Screen (temperature display only), after
you stop pushing buttons. You can disable the Minimized Screen feature by setting this time to “0”.
If this is disabled, all screens revert to the main thermostat screen after 120 seconds.

• F/C Select
Select which temperature display mode you desire, Fahrenheit (F) or Celsius (C) with +/- buttons.

• Sensor Calibration
Select this menu item to go to the Sensor Calibration screen.

• Backlite/Display
Select this menu item to go the Backlite/Display settings screen. This menu allows you to set the
backlight timeout period, On and OFF backlight brightness levels and adjust the display contrast.

User Settings Screen

User Settings
Set Clock
Screen Timeout 30
F/C Mode F
Sensor Calibration

Done _ Select
+

Done Return to Main Menu

Move menu selection pointer up
+ Increment value
_ Decrement value
Move menu selection pointer down
Select Select the function to be set

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 13

 Main Menu > User Settings > Set Clock

The Set Clock screen allows you to set the Thermostat internal clock.

To set the Time and Day, move the cursor with the navigation arrows until the data you want to change is
highlighted.

Using the + and – arrows to increment or decrement the data to the desired setting.

When finished, press the SET button to return to the Main Menu screen or wait for screen to timeout.

NOTE: If the clock has been reset by an extended power outage, the Clock display on the
thermostat screen will be blinking. Pressing the MENU button will take you directly to this screen
to set the clock.

Set Clock Screen

Set Clock

Time 12:00 PM +
Date 7/13/03
Day Thu _

Back Set

Screen navigation buttons:

Back Cancel and return to User Settings Menu

+ Increment selected item
Move back with selection box

Move forward with selection box

- Decrement selected item
Set Set the time and return to User Settings Menu

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 14

 Main Menu > User Settings > Sensor Calibration

The Sensor Calibration screen allows you to change the temperature calibration for the internal and any
external remote temperature sensors attached to the TR40 WDU. You can change the temperature
calibration by +/- 7 degrees.

When the Sensor Calibration screen is selected it will show the internal and all detected remote sensors.
Each sensor found will show the current temperature (The (75) in the example screen below) and the
current number of degrees of offset being applied (1 deg in the example). “n/a” means that the remote
sensor is not attached. If the sensor’s actual temp is (74) with 0 degrees of offset and you want it to be 75,
then press + to add 1 deg and it will show (75).

To change the temperature calibration, use the scroll buttons to select the internal or a remote sensor.
Once selected, use the + and – buttons to change the temperature calibration to the desired setting.

The value shown in the (xx) is the calibrated or offset temperature that you want the sensor to show.

You can update the info on this screen by pressing the right hand (blank) button.

When you close this screen, it may take a few seconds for the temperature to update to the new
temperature on the main thermostat screen.

Sensor Calibration Screen

Sensor Calibration
Internal (75) 1
Remote 1 n/a 0
Remote 2 n/a 0
Remote 3 n/a 0

Done +

Screen navigation buttons:

Done
Return to Main Menu Screen
Move menu selection pointer up
+ Increase the temperature by 1 deg

Decrease the temperature by 1 deg

Move menu selection pointer down
Refresh screen temperatures

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 15

 Main Menu>User Settings>Backlite/Display

The Backlite/Display screen allows you to set the Backlite ON and OFF brightness levels and contrast.

Backlite Timeout. Sets the time from last button press that the backlite will timeout and turn off.
Adjustable from 0 or 20 to 45 seconds. If set to “0”, the backlite will never timeout and will always be ON.
If set in the range of 20 to 45 seconds, the backlite will turn OFF after the selected time expires.

ON Level. Sets the brightness of the backlite when ON. Adjustable in 10% steps, 0 to 100%. If set to “0”,
backlite will never be ON. Typically set to 100% for ON.

OFF Level. Sets the brightness of the backlite when OFF. Adjustable in 10% steps, 0 to 100%. If you do
not want the backlite to go completely dark when OFF, you can set an OFF brightness to something
greater than 0%.

NOTE: When you select an ON or OFF brightness, the display changes to that level for you to
observe the brightness setting.

Contrast. Sets the contrast level of the LCD display. Adjustable from 0 to 10. Use this control to adjust
the darkness of the display. To light and the display looks faded, too dark and dark lines will appear in the
display. Typically 5 is the correct setting. Adjust as needed.

Backlite Settings Screen

Backlite/Display

Backlite Timeout 0
ON Level 100%
OFF Level 0%
Contrast 5

Done _ Select
+

Screen Navigation Buttons

Done Return to User Settings menu

Move menu selection pointer up
+ Increment value
_ Decrement value
Move menu selection pointer down
Not used

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 16

 Main Menu > Thermostat Info

The Thermostat Info screen displays the current configuration of the Thermostat Wall Display Unit and the
HVAC Control Unit. This information is useful for quick check of firmware versions and HVAC system
setup. It also shows the network address setting.

Thermostat information displayed is:

• Wall Display Unit Type and Firmware version number.

• Control Unit Type and Firmware version number.
• System Type setting: Standard or HP HVAC system
• Fan Type setting for Standard systems: No Fan w/heat (Gas systems) or Fan w/heat (Electric systems)
OR
• Changeover setting for Heat Pump systems: Changeover with cool or changeover with heat.
• Network address setting: UPB Unit ID: 1 to 250

When finished viewing this screen press the Done button to return to the main Menu screen or wait for
screen to timeout.

Thermostat Info Screen

Thermostat Info
TS40R Ver: 03.07.4
HFR Ver: 03.05.2
System Type: Standard
Fan Type: No Fan w/HT
Network Address: 01

Done

Screen navigation buttons:

Done Return to Main Menu screen.

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 17

 Main Menu > Installer Settings (Hidden Screen)
The Installer Settings screen is a hidden screen designed for installer use only. Do not change any
settings in this screen unless you are a qualified service technician. Changing these settings will affect the
operation of the heating/cooling system.

To enter this screen, go to the main menu selection screen and press and hold the two inner
buttons for 3 seconds until the Installer Settings screen appears.

The Installer Settings screen displays the current internal settings of the thermostat. You can view and
change the settings from this screen. Scroll to the desired function and use the +/- buttons to change.

Display Lock: Y or N Default: N

Y = Display LOCKED
N = Display unlocked
Allows you to lock or unlock the thermostat buttons. When the buttons are locked, you can still access the
main menu, but you will not be allowed to select any menu options. The Installer Settings hidden button
operation is always operational, allowing you to return to this screen and turn Display Lock off.

Service Mode Submenu

Service Mode: Y or N Default: N
Y = Service Mode On.
N= Service Mode Off.
Sets the thermostat to a test mode with short delays. All runtime and staging delays are reduced
to 15 seconds to speed up system checkout and testing.
Caution: compressor short cycle protection is lost in this mode.

Network Settings Submenu

Network Address: 1 to 250 (0 and 251-5 are reserved). Default: 200
Sets the serial communications network address.

Autosend: Y or N Default: N
Y = Autosend On, sends network message when there is a changes in Temp, Setpoints and Mode.
N = Autosend Off. Polled Mode. Only responds to polling requests.

Max Heat SP 10 to 109 Default: 109

Sets the maximum heating setpoint that is allowed. Will not ramp or accept setpoints higher that this
maximum.

Min Cool SP 6 to 110 Default: 6

Sets the minimum cooling setpoint that is allowed. Will not ramp or accept setpoints lower than this
minimum. NOTE: this value needs to be reset if you are going to use degree C mode.

Minimum Run Time 1- 9 Minutes Default: 6

Sets the minimum run time before a heating/cooling cycle can turn off.

Minimum Off Time 5-9 Minutes Default: 6

Sets the minimum off time before another heating/cooling cycle can begin.

Delta T Settings Submenu:

This is a submenu of the delta, or difference between, the setpoint and current temp for determining when
a heat or cool call comes on. Deltas are the number of degrees away from setpoint.

H/C Delta – Setting the minimum separation between heating and cooling setpoints. Attempts to
lower the cooling below the heating setpoint by this amount will PUSH the heating setpoint down
to maintain this separation. Same for setting the heating setpoint above the cooling setpoint will
PUSH the cooling setpoint up to maintain this separation. Range is 3 to 15 degrees. Default set
to 4 degrees.

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 18

 Heat Delta Stage 1 ON Range 1 to 8 degrees Default: 1
Sets the delta from setpoint that stage 1 heating starts. Stage 1 turns off at setpoint.

Heat Delta Stage 2 ON Range from 1 to 8 degrees Default: 3

Sets the delta from setpoint that stage 2 heating starts. Stage 2 turns off at setpoint.

Heating Delta Stage 3 ON Range from 1 to 8 degrees Default: 5

Sets the delta from setpoint that stage 3 heating starts. Stage 3 turns off at setpoint.

Cooling Delta Stage 1 ON Range 1 to 8 degrees Default: 1

Sets the delta from setpoint that stage 1 cooling starts. Stage 1 turns off at setpoint.

Cooling Delta Stage 2 ON Range 1 to 8 degrees Default: 3

Sets the delta from setpoint that stage 2 cooling starts. Stage 2 turns off at setpoint.

WDU Settings Submenu

Messaging Enable: Y or N Default setting: N
N = “Messages” does not appear in main menu screen
Y = “Messages” appears in main menu screen.
Enables or disables the network messaging function.

NOTE: If you intend to use the messaging capability of the TS40, you must enable it here
by setting to Y. “Messages” will then appear as a menu item in the main menu and you
will be able to receive and browse through the messages.

INSTALLER SETTINGS CAUTION! Do not change these settings unless you are sure of the effect
these changes will make. Changing the network address will make the thermostat not respond if
the address is incorrect.

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 19

 Installer Settings Screen

Installer Settings
Display Lock N
Service Mode
Network Addr 1
Autosend N

Done + Select

Screen navigation buttons:

Done Return to Main Menu screen

Move menu selection pointer up
+ Increase by 1 or change from Y to N

Decrease by 1 or change from Y to N

Move menu selection pointer down
Select Select menu item to go to a submenu

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 20

 TR40 Installation

STOP

Before proceeding with removing an existing thermostat and installing the TR40,
Read the following important steps.

1. Record existing wiring information on the enclosed wiring form.

2. Perform the TR40 bench test
3. Check WDU wiring BEFORE applying power to control unit.
4. Be sure to install a freeze protection device as required.

Installation Overview

Standard thermostat wiring vs TR40 in retrofit applications.

OLD Heating &

Cooling
4, 5 or 6 wires System
Thermostat 18Ga thermostat wiring

Insert Control Unit into

Replace
the thermostat wiring
Thermostat with
Wall Display Unit

Heating &
NEW Cooling
System
4 Wires
TR40 TR40 4,5 or 6 wires
Wall Display Control as original
Unit Unit installation

Freeze Protection.
In cold climates that require the heating system to be used for building freeze protection, a mechanical
backup freeze protection device MUST be installed on the heating system. This can be a simple
mechanical heating thermostat or a preset thermoswitch installed in the heated area.

40-45°
Mechanical R Red Wire 24VAC R
Heating
Thermostat or System
Thermoswitch W White Wire Heat W

Thermostat connections

Wire across Heater R/W terminals.

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 21

 TR40 Wall Display Unit Installation
WDU Location. Choose a location that best represents the temperature of the area to be controlled.
Avoid locations that are subject to drafts, from doors and windows, or areas with direct sunlight exposure.

WDU Mounting

Route the wires to the WDU through the access hole in the back of the case. Mount the WDU to the wall
with the screws and anchors provided. Be sure to plug any large access hole in the wall with sealer or
insulation to prevent wall drafts from affecting WDU operation.

WDU Prewiring

For new construction, the recommended wiring to the WDU from the Control Unit should be a two twisted
pair cable, 22 Ga minimum. Use of Category 5 wiring is preferred, but not required. In retrofit
applications the existing 18Ga thermostat wiring (a least 4 wires) is adequate and usually will work without
problems. However, such non-twisted wiring can be subject to interference due to adjacent in-wall high
voltage wiring.

Wiring the WDU to the Control Unit

Wiring the WDU is simply connecting the four wire cable from the Control Unit to the WDU terminal block.
Two wires are for data and two are for power. WDU power is 12VDC and provided by the Control Unit.

CAUTION: DO NOT MISWIRE THE POWER AND DATA LINES…DAMAGE WILL RESULT!!!
CHECK YOUR WIRING BEFORE APPLYING POWER…

Hook TOP here and rotate into

base. Be sure pins engage in
connector correctly.
TR40 WDU
BASE

BASE
WIRING
TO CLOSE ACCESS
HOLE
J2
J1
G - 1 GND
CLOSE +5 + 2 +12V
C C 3 CLOCK
D D 4 DATA

TO OPEN
PULL FROM LOWER CORNERS
For Remote Sensor

OPENING AND CLOSING THE WDU CASE TR40 WDU WIRING DIAGRAM

Remote Sensor Connection

Model TS40 WDU has an remote sensor connector, J2, on the WDU base for connection of an external
remote temperature sensor. Follow the wiring diagram with the remote sensor to connect to the WDU.

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 22

 TR40 Control Unit Installation
Location and Mounting
Install the TR40 Control Unit in a protected, convenient, INDOOR location near the HVAC system or in a
service accessible area such as an equipment closet or garage.

Mount the Control Unit in a vertical position on a wall or sturdy structural member. The unit may be
mounted on the HVAC system but care should be taken to avoid the hot burner section or high vibration
areas.

Control unit wiring

The TR40 HVAC Control Unit is connected to the HVAC system and to the Wall Display Unit as well as the
serial communications and power connections.

Control Unit to WDU wiring

Connect the WDU to the Control Unit with existing thermostat wiring in retrofit installations. For new
installs, 22/24 GA twisted pair, typically Cat3 or Cat 5 wiring is preferred.
Control Unit

TS40 WDU J1
GND
GND G
+12V
+12VDC +V
CLK
CLOCK C
DATA
DATA D

CAUTION!
Be careful to not miswire the Wall Display Unit to Control Unit connections as damage may result.

Control Unit to HVAC System wiring

Electrically, the Control Unit looks like a standard thermostat to your HVAC system. All connections to the
HVAC system are made at the normal thermostat connections on the HVAC unit.

You are advised to refer to your HVAC system’s documentation for specific information on its thermostat
connections and setup requirements. You must know the following:

1. HVAC system type: Gas, Electric, Heat Pump, Radiant, Hydronic

2. Fan requirement: No fan with Heat or Fan with Heat
3. For Heat Pump systems: Changeover with cool or with heat. (O or B connection)

Note on retrofit wiring. You may note (and be sure to note on the wiring form) that you have additional
wires when you disconnect your old thermostat. Usually these wires are for auxiliary functions such as
filter or trouble indicators. For Heat Pump systems there may be emergency heat (EH) wiring or both O
and B changeover connections. These wires are not used in the TR40 installation and, in most cases,
these extra wires are not required for normal HVAC system operation.

Refer to the following HVAC wiring diagrams for your type of HVAC system, Standard Or Heat Pump.

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 23

 HVAC System Wiring

Diagram 1 - Standard Gas or Electric System Wiring

IMPORTANT! For typical central heating/cooling systems,
leave jumper JP1 installed. If you have separate Heating
TR40 Control Unit and Cooling system transformers, CUT JUMPER JP1. Wire
RC to the Cooling system transformer and RH to the
FUSE Heating system transformer.
SW1
STD 1 HP
S2 2
Standard HVAC System
OFF ON
JP1
Note: Set SW1-S1 to STD RC&RH
THERMOSTAT CONNECTION
S2 to OFF
24V COM C 24VAC Common
24V RH Red (or RH for split systems) R 24VAC Return
24V RC Red (or RC for split systems) Wire R to either RH or RC for common
transformer HVAC systems
W1 Heat 1 White
W1 Heat Stage 1
W2 Heat 2 Orange W2 Heat Stage 2
G Fan Green G Fan
Y1 Comp 1 Yellow Y1 Comp Stage 1

Y2 Comp 2 Black Y2 Comp Stage 2

J4
HVAC SYSTEM

Typical thermostat wiring color codes

HFRU REV P

Standard HVAC System Setup Notes:

Single Stage Systems use W1 for heating stage 1, and Y1 for cooling stage 1.

Two Stage Heating systems use W1 for stage 1 and W2 for stage 2 heating.

Two Stage Cooling systems use Y1 for stage 1 and Y2 for stage 2 cooling.

HVAC System 24VAC Transformer

If you have an integrated heating and cooling system with a single transformer, do NOT cut jumper JP1.
Wire the 24V Return (red) wire to either RH or RC. This is typical of most central systems.

If you have separate heating and cooling systems with separate transformers, cut jumper JP1. Wire the
heating 24V R (red) wire to the control unit’s RH terminal and run the cooling systems 24V R (red) wire to
control unit’s RC terminal. Also wire the cooling systems 24VAC Com to the control units 24VAC Com
terminal.

Dipswitch SW1 Setup for Standard HVAC Systems

1. Set SW1-1 (position 1) to the STD position. (Off - to the left) (default setting)
2. Set SW1-2 (position 2) to the correct setting for your HVAC system.
a. Gas furnaces do not require fan outputs for heating calls. Set SW1-2 to the Off - to the left.
(default)
b. Electric furnaces do require fan outputs for heating calls. Set SW1-2 to the On - to the right.

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 24

HVAC System Wiring

Diagram 2 - Heat Pump System Wiring

TR40 Control Unit

FUSE IMPORTANT! Do not cut JP1 for Heat Pump Systems.

SW1
RC and RH are common for Heat Pumps.
STD 1 HP
S2 2
OFF ON Heat Pump HVAC System
JP1
Note: Set SW1-S1 to HP RC&RH THERMOSTAT CONNECTION
And S2 to correct Changeover valve
setting 24C COM Blue
C 24VAC Common
24V RH Red
R 24VAC Return
24V RC Wire R to either RH or RC

W1 Heat 1 White
W1 Heat Strips (Heat Stage 3 )
W2/O CO Orange O Changeover Valve
G Fan Green G Fan
Y1 Comp 1 Yellow Y1 Comp Stage 1
Y2 Comp 2 Black
Y2 Comp Stage 2

J4
HVAC SYSTEM

HFRU REV P Typical thermostat wiring color codes

Heat Pump HVAC System Setup Notes:

Single Stage Compressor Systems use Y1 for stage 1 heating/cooling, and W1 for stage 2 heating (heat
strips).

Two Stage Compressor Systems use Y1 for stage 1, Y2 for stage 2 heating/cooling, and W1 for stage 3
heating (heat strips).

NOTE: You must configure the Changeover valve setting to work correctly with your HVAC system.
Set Dipswitch SW1 as below for correct changeover operation. Changeover with cool is typical for
most systems. Check your system information to be sure. If you get cooling when you expect
heating, change SW1-S2 to the other position.

Dipswitch SW1 Setup for Heat Pump HVAC Systems.

1. Set SW1-1 (position 1) to the Heat Pump position. (On - to the right)
2. Set SW1-2 (position 2) to the correct changeover (reversing valve) setting for your Heat Pump system.
a. For systems with changeover with cooling, Set SW1-2 to Off - to the left (default setting)
b. For systems with changeover with heating, Set SW1-2 to On - to the right

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 25

TR40 Power Connection
The TR40 Control Unit requires 24VAC power from the HVAC system it is controlling. Connect the 24VAC
Common (Blue wire/terminal) and 24VAC R (Red wire/terminal) from the HVAC system to the control
unit’s HVAC System terminal block J4’s 24VCom and 24V RH or 24V RC terminals (the RH and RC
terminals are default jumpered together…see below)

Common or Split Transformer Systems

Most HVAC systems have a common heating and cooling transformer. Connector JP1 is jumpered to
common the RH and RC inputs together for this configuration. If you have a system with separate heating
and cooling transformers, you will need to split the RH and RC jumper by cutting the JP1 jumper.

When wiring split systems, wire the heating systems 24VAC R (red wire) to the Control units RH terminal,
and wire the cooling systems 24VAC R to the control units RC terminal. Also wire the cooling systems
24VAC Com to the control units 24VAC Com terminals.

TR40 Serial Communications

RS485 Com Port

The TR40 has a RS485 serial com port. This is a 2 wire (plus ground), half duplex communications
network. Typically, the TR40 will be used on the RCS RS485 network and controlled by a CommStar
Network Control Unit.

The RS485 Com Port communications setup is 9600 baud, 8 data bits, 1 stop bit, and no parity. Flow
control is set to “None”.

Transmission delay. The TR40 will delay responses to request messages for 5mS to conform to the
RCS CommStar network protocol. This is necessary for RS485 half duplex devices to use Send Data
Control for automatic flow control

RS485 Address

You can check the network address setting of the TR40 by pressing the Menu button to open the Main
Menu screen. Scroll down to the Thermostat Info menu item and press “Select”. The Thermostat Info
screen will show the current network address of the TR40. The default network address is 1.

Changing the Network Address

The network address is set from the “Installers Settings” menu on the Wall Display Unit. This is a “hidden
menu” and does not appear in the main menu selections. To get to the “Installer Settings Menu”, first
press the menu button to open the main menu screen. While in the main menu screen, press and hold
down the middle two buttons on the WDU for 5 seconds until the “Installer Settings” menu opens. Scroll
down to the “Network” menu item and press select. You can set the network address from 1 to 254.

Note: Network address 0 is reserved for the host system address and 255 is reserved for global
commands.

RS485 Protocol

The TR40 thermostat has a robust serial protocol. It is based on a simple ASCII message format as
described in the RCS Serial Communications Protocol manual, DCN: 150-00225.

Note: NOT ALL of the commands/variables defined in the protocol document are applicable to the
TR40, check Section 8 of the protocol manual for details.

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 26

Thermostat Network Commands
Serial commands received by the Control Unit can set a new setpoint or a new mode and when received
they are sent to the WDU to update it’s display.

TR40 thermostats also responds to request for status by serial commands and can provide all thermostat
data and setup information as well as the current revisions of the WDU and Controller firmware.

The following thermostat information can be sent to or requested from the thermostat by the serial
protocol.

• Temperature
• Heating setpoint
• Cooling setpoint
• System Mode
• Fan Mode
• F/C mode
• HVAC output status
• Network Address
• Any system variable
• System firmware revisions

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 27

 System Checkout
It is strongly recommended that you hook-up and run a simple bench test before installing the TR40. Not
only will this save you time in system checkout but will also familiarize you with the thermostat’s operation.

THERMOSTAT BENCH TEST

1. Connect the Wall Display Unit to the Control Unit with a short (12-24 inch) 4 wire cable.
2. Before power up, set the Control Unit dipswitch, SW1, to ALL OFF
3. Connect power to the Control Unit.
4. Verify Control Unit Status LED is blinking.
5. Verify the WDU display comes on and shows the current temperature.
a. If no display and backlights are not on, check wiring and power at the Control Unit.
b. If a “CF” display is shown on the WDU, double check your wiring to the Control Unit.
d. Do not proceed until the current temperature is displayed on the WDU.
6. With the current temperature displayed on the WDU, we have verified communication between it and
the Control Unit is OK. Any communication problems will result in a “CF” (Communications Failure)
display on the WDU and must be fixed before proceeding. If all is OK with the WDU proceed to the next
step.
7. Press the Fan button on the WDU. The Control Unit’s Fan LED and relay should turn on.
8. Press the Fan button again. The Fan LED and relay should turn off.
9. Press the Mode button until the WDU is showing “H” for Heat Mode.
10. Press the Setpoint Up button until the setpoint is above the current temperature. The Heat LED and
relay should come on. (If they don’t, make sure the Status LED is not flashing twice indicating minimum off
delay…wait until LED stops flashing twice before proceeding).
11. Press the Mode button until the WDU is showing “O” for OFF. The Heat LED and relay will turn OFF.
12. Wait 6 minutes for the minimum off delay to expire. The Status LED will stop flashing twice.
13. Press the Mode button until the WDU is showing “C” for Cool Mode.
14. Press the Setpoint Down button until the setpoint is below the current temperature.
15. The Compressor and Fan LEDs and relays should turn on.
16. Press the mode button until the WDU is showing “O” for OFF Mode.
17. All LEDs and relays should turn off.
18. When you have successfully completed all these tests, you have verified that the TR40 is working
correctly.

SERIAL COMMUNICATIONS TEST

Connect the TR40 to a PC via a RS232/485 converter to a PC serial COM port.

Note: Any RS232 to RS485 adapter used with RCS serial thermostats must have AUTOMATIC
SEND DATA CONTROL. All RCS converters have this feature, if you use another type of converter,
be sure it has this capability.

Using Windows HyperTerminal.

• Set up a direct connection session to the COM port you will be using on the PC.
• Configure Port Settings to 9600 baud, 8 bit, No parity, 1 stop bit and no flow control.
• Under Settings tab go to ASCII Setup…
• Set the ASCII sending to echo characters and no delays.
• Set ASCII receiving to Append line feeds and Wrap lines.

NOTE: RCS serial ASCII commands are CASE sensitive!

Verify Serial communications by typing the following command sequence: A=1 R=1 <cr>
Thermostat should reply with the R1 status message. A=00 O=1 T=xx SP=xx SPC=xx SPH=xx M=x FM=x
If you have problems communicating, check addresses and port settings.

You can also use the RCS Thermostat Control Program to check out serial communications to the
TR40.
DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 28
HVAC System Testing
If you have difficulty with the HVAC system operation, you can perform the following test to verify the
HVAC system is operational.

Thermostats, like the TR40, are just switches to the HVAC system as shown in the diagram below.
This is a simplified example of a thermostat and a standard HVAC wiring diagram. The HVAC system
operation can be tested by duplicating the thermostat switch operation by shorting across the thermostat
terminals on the HVAC system.
HVAC SYSTEM
STANDARD GAS/AC

TYPICAL THERMOSTAT
C 24VAC COMMON
24VAC
R 24VAC HOT
G FAN FAN
FAN RELAY
HEAT W HEAT
GAS
COMP Y COMP VALVE

Thermostat COMP
RELAY
Connection

Note: The HVAC system and thermostat connection voltage is 24VAC. This is a safe voltage to
work with but be careful to avoid shorting the 24VAC common (C) and 24VAC return (R) terminals.
This may blow a fuse in the HVAC system.

Standard HVAC System Quick Test

You can perform a quick test of the HVAC system by shorting across the appropriate thermostat terminals
on the HVAC thermostat connector. Use a short 6 inch wire to connect across the following terminals.

Function Test HVAC Terminals Result

Fan R to G Fan should come on
Heating R to W Heat cycle should start for heating
Cooling R to Y and G Compressor and Fan should start for cooling

Heat Pump System Quick Test

Similarly, you can test Heat Pump operation by shorting across the following terminals. Heat pump
operation is determined by compressor calls in conjunction with changeover (O) outputs. You must know
what your system CO type is (CO with Cool (typical) or CO with Heat). You should have configured the
TR40 control unit for correct CO type, refer to this setting. Heat Pump systems have an additional O
terminal.

Function Test HVAC Terminals Result

Fan R to G Fan should come on
Heating R to Y and G Compressor and Fan should start and Heating
occurs.
Cooling R to Y and G and O Compressor and Fan should start.
CO valve operates and Cooling occurs.

Note: if you have the CO selection incorrect you will get cooling when you expect heating and vice versa.
Change the dipswitch SW1-2 changeover setting to correct this problem.

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 29

 RCS TR40 Wiring Diagram

TR40 CONTROL UNIT

SW1

STD 1 HP Fuse
Mini ATO
S2 2 2 Amp
TS40
WALL DISPLAY UNIT OFF ON
RH=RC
WDU Cut Jumper
J1 to split
GND G GND JP1 HVAC SYSTEM
+12VDC +V 12V
STATUS 24V COM Blue THERMOSTAT CONNECTOR
CLOCK C C
24V RH
HEAT1 C - 24VAC Common
DATA D D 24V RC Red R - 24VAC Return
HEAT2 W1 White W1 – Heat Stage 1
RS485 CO
J2 W2 / O* Orange W2/O* – Heat Stage2
FAN
GND G Green
Gnd G – Fan
COMP1
RS485 Data+ D+ Y1 Yellow Y1 – Comp Stage 1
RS485 Data - D- Y2 Black Y2 – Comp Stage 2
COMP2

J4
HVAC SYSTEM
* for HP HVAC Systems
O=Changeover Valve
HFRU REV P
Typical Thermostat wiring colors.

HVAC System Transformer:

Most central HVAC systems have a common heating and cooling transformer. This is the factory default
setting for Jumper JP1. In some cases, you may have separate heating and cooling systems, each with their
own transformer. In that case, cut Jumper JP1 and wire the heating transformer red wire to the RH terminal
and the cooling system transformer red wire to the RC terminal. Wire the cooling system’s 24VAC Com to the
control unit’s 24VAC Com terminal.

Dipswitch SW1 Settings: (White is switch position)

SW1-S1, STANDARD OR HEAT PUMP SYSTEM SELECTION

HVAC Systems can be either Standard Gas/Electric systems or Heat Pump systems.
Set S1 to STD SYS (OFF) for Gas/Electric systems (default setting).
Set S1 to ON for Heat Pump systems

SW1-S2 Fan or Change Over Valve Selection

If S1 is set to Off for Standard HVAC systems, then S2 selects the HVAC fan type.
Set S2 to OFF for gas systems that do not require Fan w/heat calls.(default setting)
Set S2 to ON for electric systems.

If S1 is set to On for HP HVAC systems, then S2 selects the changeover or reversing valve type.
Set S2 to OFF for changeover with cooling (default setting).
Set S2 to ON for changeover with heating

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 30

 Appendix A
TR40 Serial Network Command and Variable List
Refer to the RCS Serial Communications Protocol Manual 150-00225 for details of formats.

Network Commands

Command Description
BF Set Setback Flag.
CFM Set F or C temperature Mode
DATE Set Date
DL Set Display Lock
DOW Set Day of Week
F Set Fan Mode
M Set System Mode
OT Set Outside Air Temperature Data (for network supplied OT)
SC Set Schedule Control Run/Hold Mode
SEd/x Set Schedule entry for day and entry
SP Set Setpoint (for single setpoint systems)
SPC Set Cool Setpoint
SPH Set Heat Setpoint
SVx Set Variable number x
TIME Set Time
R=1 Request Status Message 1 Thermostat data
R=2 Request Status Message 2 HVAC data
R=3 Request Status Message 3 Temperature data only
R=4 Request Status Message 4 Setpoint data only
R=5 Request Status Message 5 Mode data only
R=6 Request Status Message 6 Model/Version number of WDU and Control Unit
R=7 Request Status Message 7 Time and DOW

Network Variables for use with the System Variable, SVx command

Variable
Number Name Variable Data Default value Notes
1 System Type* 0,1, 0 0= Gas/Electric, 1 = Heat Pump
2 Fan Type * 0,1 0 0= GAS (No fan w/Heat), 1= ELECTRIC
3 Change Over Type* 0,1 0 0= c/o w/cool, 1=c/o w/heat
4 C/F Type 0,1 1 0= Centigrade, 1=Fahrenheit
5 Network Address 1-254 1 Reserved: 0= host, 255= global
9 Display lock 0,1 0 0= unlocked, 1=locked
10 MOT 5-9 min 6 min 0 = 20 sec test time
11 MRT 0-9 min 6 min 0 = 20 sec test time
12 H Delta Stage 1 On 0-8 deg 1 deg
14 H Delta Stage 2 On 0-8 deg 4 deg
16 H Delta Stage 3 On 0-8 deg 6 deg
18 C Delta Stage 1 On 0-8 deg 1 deg
20 C Delta Stage 2 On 0-8 deg 4 deg
22 C Delta Stage 3 On 0-8 deg 6 deg
24 Setpoint H/C Delta 3-15 deg 3 deg Min Delta T between H/C Setpoints
69 Service (Test) Mode 0,1 0 1 = Test Mode, sets MRT/MOT = 20 sec
74 AutoSend mode 0,1 0 0=off, 1=on, send temp/mode on change

* These variables are determinded by the controller dipswitch SW1 setting. They can be viewed by the
System Variable command, but cannot be changed.

DCN: 141-01080-16 12/19/05 TR40 Thermostat Manual 31