GE Thermostat CC SCSTAT User Manual
SmartCommand Thermostat  
Installation Manual  
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Contents  
Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
Conventions used in this document. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
Safety terms and symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
Product overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Wall display unit (WDU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Thermostat control screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Temperature display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Setpoint display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Clock display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Up and down buttons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
Menu button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
Mode button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
Fan button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
Run/Hold button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
LED display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
Communication error display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
Main menu screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
Messages screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
Schedule setup screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
Heat and cool schedule screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10  
Copy schedule screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11  
User settings screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Set clock screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13  
Sensor calibration screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14  
Backlight display screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15  
Thermostat information screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
Installer settings screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
Installation overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20  
Freeze protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21  
Wall display unit installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22  
Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22  
Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22  
Control unit installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
Control unit to WDU wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23  
Control unit to HVAC wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23  
Retrofit wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23  
HVAC system wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24  
Standard HVAC system wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24  
Heat pump HVAC system wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26  
Control unit connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28  
Serial communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29  
System checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31  
Thermostat bench test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31  
 
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SmartCommand Thermostat  
Installation Manual  
Serial communication test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32  
HVAC system testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33  
Control unit wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35  
Serial network command and variable list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37  
Network commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37  
Network variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38  
Contacting technical support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39  
Online publication library . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39  
 
1
Preface  
This is the GE SmartCommand Thermostat Installation Manual for model CC-SCSTAT. This document  
includes an overview of the product and detailed instructions explaining:  
•
•
how to install; and  
how to operate the thermostat.  
There is also information describing how to contact technical support if you have questions or concerns.  
To use this document effectively, you should have the following minimum qualifications:  
•
•
a basic knowledge of HVAC control components; and  
a basic knowledge of electrical wiring and low-voltage electrical connections.  
Read these instructions and all ancillary documentation entirely before installing or operating this product.  
The most current versions of this and related documentation may be found on our website. Refer to Online  
publication library on page 39 for instructions on accessing our online publication library.  
Note:  
A qualified service person, complying with all applicable codes, should perform all required hardware installation.  
Conventions used in this document  
The following conventions are used in this document:  
Bold  
Menu items and buttons.  
Italic  
Emphasis of an instruction or point; special terms.  
File names, path names, windows, panes, tabs, fields, variables, and other GUI elements.  
Titles of books and various documents.  
Blue italic  
(Electronic version.) Hyperlinks to cross-references, related topics, and URL addresses.  
Text that displays on the computer screen.  
Monospace  
Programming or coding sequences.  
Safety terms and symbols  
These terms may appear in this manual:  
CAUTION: Cautions identify conditions or practices that may result in damage to the equipment or other property.  
WARNING: Warnings identify conditions or practices that could result in equipment damage or serious personal injury.  
 
     
2
SmartCommand Thermostat  
Installation Manual  
Product overview  
The SmartCommand thermostat (model CC-SCSTAT) provides typical thermostat functions as well as the  
capability to send and receive information via serial communications. This 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 control unit. It provides a  
display screen, control buttons, and the temperature sensor. The wall display unit connects to the control unit  
by a four-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 communication connection for remote control of the system. The control  
unit can be used with up to three remote temperature sensors.  
Wall display unit (WDU)  
The WDU has a backlit LCD graphical display capable of both text and graphics, control buttons, LEDs, and a  
digital temperature sensor. The unit can display multiple screens. In the default Thermostat control screen  
(Figure 1) it shows the current temperature, setpoints, mode and manual fan mode, time, outside temperature  
and other information.  
Figure 1. Wall display unit default screen  
WDU screen  
10:25 AM  
Sys Off  
Econ  
Run  
Outside 60  
Up button  
76 H  
74 C  
LEDs  
Down button  
75  
No Msg  
MODE  
FAN  
MENU  
RUN  
Control buttons  
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.  
WDU control buttons  
Both the four control buttons and the up and down buttons on the WDU 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.  
 
     
3
WDU LEDs  
The four LEDs on the WDU display various status information. The LEDs have dynamic on-screen labels that  
can change when you change screens.  
WDU screens  
One of the unique features of the 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 and allows the many functions of the  
thermostat to be easily navigated.  
The WDU screens include:  
Thermostat control screen. The Thermostat control screen on page 4 screen is the only screen needed  
for basic thermostat operation. All other screens will automatically timeout and return to this screen after  
120 seconds of no activity.  
Minimized thermostat screen. The Thermostat control screen will go to a minimized screen after a 30  
second timeout period. This screen presents a simple, uncluttered display of the current room temperature.  
You can disable the Minimized screen if desired.  
Note:  
You can press any button when the Minimized screen is displayed to restore and display the Thermostat  
control screen.  
Menu selection screen. Press the Menu button on the Thermostat control screen to access the Main menu  
screen on page 7. This screen presents a list of the other functions or setup screens that you can select.  
Messages screen. The unit is capable of receiving messages from the RS485 network. Messages received  
are displayed in the Messages screen on page 8.  
Schedule setup screen. Use the Schedule setup screen on page 9 to setup and select schedules for the  
thermostat.  
User settings screen. Use the User settings screen on page 12 for the initial setup of the thermostat. From  
this screen, you can set the clock, minimized screen timeout, Fahrenheit or Centigrade selection, sensor  
calibration, and display settings.  
Thermostat information screen. This is a quick reference list of the thermostat firmware versions and  
setup. (See Thermostat information screen on page 16.)  
 
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SmartCommand Thermostat  
Installation Manual  
Thermostat control screen  
The Thermostat control screen (Figure 2) is the default display screen normally displayed on the WDU.  
Figure 2. Thermostat control screen  
Clock  
display  
Setpoint  
Display  
10:25 AM  
Outside 60  
Up  
Sys Off  
Econ  
Run  
76 H  
74 C  
LED  
Display  
75  
Down  
No Msg  
MODE  
FAN  
MENU  
RUN  
Menu  
Mode  
Fan  
Run/Hold  
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 (± 0.5°C). The WDU will display temperatures from -40  
to 190°F (-40 to 88°C). 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 Up and Down buttons. In heat mode, the Up and  
Down buttons change the heat setpoint. In cool mode, they change the cooling setpoint. When in auto mode,  
the buttons change the last call’s heating or cooling setpoint. The setpoints will push each other if they are  
adjusted to within the minimum heat/cool separation (delta T) setting. This setting is default set to 4 degrees,  
but can be changed in the installer settings.  
Clock display  
The current time is displayed in the upper left corner of the main screen. Set the clock from the User settings  
screen on page 12.  
 
         
5
Up and down buttons  
The Up and Down buttons adjust the setpoint temperature. Press Up to increase the setpoint value by one  
degree and press Down to decrease 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 6 to 109° (F or C),  
unless limited in the installer settings.  
You cannot lower the cooling setpoint below the heating setpoint. The thermostat will push the heating setpoint  
lower if you try to lower the cooling below the heating setpoint. It maintains a setpoint delta separation  
between heating and cooling setpoints. 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 setpoint delta separation.  
Menu button  
The Menu button changes the screen display to the Main menu screen that shows other functions available on  
the thermostat. These are dynamic and can change with the version of the thermostat you have, but the standard  
ones include:  
•
•
•
•
Messages screen on page 8  
Schedule setup screen on page 9  
User settings screen on page 12  
Thermostat information screen on page 16  
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 mode cycles  
through the following modes with each press of the Mode button.  
Off mode. The system is off. No heating or cooling will come on. If it was on, the system will turn off.  
Heat mode. Only heating operation will occur.  
Cool mode. Only cooling operation 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 setpoints.  
EH mode. This mode is 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.  
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 the 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. Changes in the fan mode are sent to the control unit.  
 
       
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SmartCommand Thermostat  
Installation Manual  
Run/Hold button  
The Run/Hold button controls the automatic schedule operation. In 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 the  
week.  
Away mode. There is also an away mode that you can select if you press and hold the Run button for three  
seconds. In the away mode, the setpoints are changed to preset temperatures: 66°F heating and 80°F cooling.  
LED display  
The Thermostat control screen has the following LED labels and descriptions, numbered from top to bottom.  
LED 1 green, system operation display  
LED off, SYS OFF displayed. HVAC system is off.  
LED off, SYS MOT displayed. Minimum off time (MOT) delay on is active.  
LED on, SYS ON displayed. HVAC system is running.  
LED on, SYS MRT displayed. Minimum run time (MRT) delay off is active.  
LED 2 green, system Economy mode display  
LED off or on, Econ displayed. Economy or first stage heating or cooling only.  
LED on, 2nd Stg displayed. Stage two heating or cooling is active.  
LED on, 3rd Stg displayed. Stage three heating is active.  
LED on, Vent displayed. Fresh air venting is active.  
LED 3 green, Run/Hold display shows state of schedule Run/Hold mode  
LED off, Run displayed. Schedule is running.  
LED on, Hold displayed. Schedule is off, temperature setpoint hold in effect.  
LED 4 red, alert LED used for messaging and other system alerts  
LED off, No msg displayed. No text messages or alerts present.  
LED on, mail icon or alert text displayed. Message waiting or specific alert text.  
Communication error display  
If the WDU is not properly wired or if communication to the control unit is interrupted, the LCD display will  
flash Comm Failureat the top center of the Thermostat control screen (where outside temperature is normally  
displayed). Momentary display of communication failure caused by loss of data, will clear automatically when  
data communication is restored. If the communication failure display stays on, check wiring or the control unit  
for problems.  
 
     
7
Main menu screen  
The thermostat has a menu tree that can be accessed by pressing the Menu button on the main Thermostat  
control screen. Various configurations of the unit can have different screen contents. The first screen that will  
display is the Main menu screen (Figure 3). This is a list of the other menus or functions that you can access.  
Standard screens are listed in this manual, your screen may vary with different configurations or revisions.  
Figure 3. Main menu screen  
Menu Selection  
Messages  
Schedules  
Up  
User Settings  
Thermostat Info  
Down  
Select  
Done  
Done  
Select  
Screen options include:  
Messages. Access the Messages screen on page 8. A text messaging subsystem allows messages of up to  
80 characters to be sent to the thermostat. Messages received display when the message screen is selected.  
The Messages menu item may or may not be displayed. It can be enabled or disabled from the installer  
settings.  
Schedules. Access the Schedule setup screen on page 9 to set the programmable setback schedules of the  
thermostat.  
User settings. Access the User settings screen on page 12 to set the clock, screen timeout, F/C mode,  
sensor calibration, and backlight/display settings.  
Thermostat information. Access the Thermostat information screen on page 16 that displays the  
firmware versions of the WDU and control unit, the HVAC system type and equipment options, and the  
network address of the thermostat.  
Screen navigation buttons include:  
Done. Return to Thermostat control screen on page 4.  
Select. Select menu item at pointer.  
Up. Move selection pointer up.  
Down. Move selection pointer down.  
 
   
8
SmartCommand Thermostat  
Installation Manual  
Messages screen  
The Messages screen (Figure 4) allows you to retrieve text messages sent from the serial network to the  
thermostat. The Messages screen features navigation buttons to read new and old messages and delete  
messages.  
You can store up to 16 messages. If more than 16 messages are received, the oldest is erased to make room for  
the newest message.  
Note:  
New messages will turn on and flash the red message LED and mail icon in the main Thermostat control 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. When you first select the Messages screen, the most  
recently received message will be displayed as Message 1. If other messages are stored in memory, you can  
recall and view or delete them by using the Messages screen navigation buttons.  
Figure 4. Messages 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/time stamped  
Done  
Del  
Prev  
Next  
Done  
Delete Previous Next  
Screen navigation buttons include:  
Done. Return to main Main menu screen on page 7.  
Del. Delete the message being displayed.  
Prev. Display previous messages. Scroll up in the message stack.  
Next. Display the next message. Scroll down in the message stack.  
 
   
9
Schedule setup screen  
The Schedule setup screen allows you to review and set the setback schedule for the thermostat. The thermostat  
has a 4 by 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 thermostat is set  
to run mode, the schedule will be executed daily, with the setpoints being changed as per that day’s schedule  
stored in the thermostat. Hold mode stops the scheduled operation and holds the current setpoints until changed  
manually or by network commands.  
The Schedule setup screen (Figure 5) gives you the option of setting a custom setback schedule or the option to  
load one of two preset schedules.  
Figure 5. Schedule setup screen  
Select Schedule  
Heat and Cool  
Preset: Comfort  
Preset: EnergyMiser  
Up  
Down  
Select  
Done  
Done  
Select  
Screen options include:  
Heat and cool. Change the individual day/hour and setpoints for the heating and cooling schedule (see  
Heat and cool schedule screen on page 10).  
Preset: Comfort. Load the comfort schedule into the thermostat. This is a preset schedule with mild  
setbacks.  
Preset: EnergyMiser. Load the EnergyMiser schedule into the thermostat. This is a preset schedule with  
deeper setbacks.  
Screen navigation buttons include:  
Done. Return to Main menu screen on page 7.  
Select. Select the schedule to view or modify.  
Up. Move selection pointer up.  
Down. Move selection pointer down.  
 
   
10  
SmartCommand Thermostat  
Installation Manual  
Heat and cool schedule screen  
When you select the Heat and cool schedule menu item, the Heat and cool schedule screen (Figure 6) opens  
and the schedule for the current day will be displayed. Use the scroll buttons to highlight the data to be  
modified. Once the data has been highlighted, use the Up (+) and Down (-) buttons to change the value of the  
data.  
To copy a day’s schedule to another day or group of days, move the cursor to C on the bottom right of the  
screen. When you highlight C, the button below will change from Next to Copy. Press this button to access the  
Copy schedule screen on page 11.  
Figure 6. Heat and cool schedule screen  
Monday Schedule  
Time Heat Cool  
Morn 6:00 A 72 82  
9:00 A 68 84  
5:00 P 74 76  
Nite 10:00 P 70 78  
Done  
Up (+)  
+
_
Day  
Eve  
Down (-)  
C
Next  
Done  
Left  
Right  
Next/Copy  
Screen navigation buttons include:  
Done. Return to the Main menu screen on page 7.  
Left. Scroll back.  
Right. Scroll forward.  
Next/Copy. When the button shows Next, select the next day’s schedule. When the button shows Copy,  
go to the Copy schedule screen on page 11.  
Up (+). Increase time or temperature.  
Down (-). Decrease time or temperature.  
 
   
11  
Copy schedule screen  
The Copy schedule screen (Figure 7) is a sub screen of the Heat and cool schedule screen on page 10. The  
Copy schedule screen allows you to copy a day’s schedule to another day or group of days.  
To copy a day’s schedule, do the following:  
1. Select the day to be copied in the Heat and cool schedule screen. Scroll to the C at the bottom of the  
Heat and cool schedule screen to highlighted it. The Next button will change to the Copy button. Press  
Copy to open the Copy schedule screen (see Heat and cool schedule screen on page 10).  
2. Scroll through the days in the Copy schedule screen and select the days the schedule is to be copied to  
by setting the N under each day to Y, using the Up (Yes) and Down (No) buttons.  
3. After selecting all the days desired, press Copy.  
4. Press Back to exit the Copy schedule screen.  
Figure 7. Copy schedule screen  
Copy Monday Schedule  
to  
Up (Yes)  
Sun Tue Wed Thu Fri Sat  
Yes  
No  
N
Y
Y
Y
Y
N
Down (No)  
Copy  
Back  
Back  
Left  
Right  
Copy  
Screen navigation buttons include:  
Back. Return to the Heat and cool schedule screen on page 10.  
Left. Move the selection bar back.  
Right. Move the selection bar forward.  
Copy. Copy the schedule to the selected days.  
Up (Yes). Copy the schedule to this day.  
Down (No). Do not copy to this day.  
 
   
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SmartCommand Thermostat  
Installation Manual  
User settings screen  
The User settings screen (Figure 8) allows you to set or change various user options of the thermostat such as  
the clock, minimized screen timeout, Fahrenheit/Centigrade mode, sensor calibration, and backlight settings.  
Figure 8. User settings screen  
User Settings  
Set Clock  
Screen Timeout  
F/C Mode  
Up  
30  
F
Sensor Calibration  
Down  
Done  
+
-
Select  
Done  
Plus  
Minus Select  
Screen options include:  
Set clock. Access the Set clock screen on page 13.  
Screen timeout. Set the screen timeout time in seconds. Options are 0 or 15 to 127 (default is 30 seconds).  
This is the time before any screen reverts to the Minimized screen 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 control screen on page 4 after 120 seconds.  
F/C select. Select which temperature display mode you desire, Fahrenheit (F) or Centigrade (C) with the  
+ and - buttons.  
Sensor calibration. Access the Sensor calibration screen on page 14.  
Backlight/Display. Access the Backlight display screen on page 15.  
Screen navigation buttons include:  
Done. Return to the Main menu screen on page 7.  
Plus. Increase the selected value.  
Minus. Decrease the selected value.  
Select. Select the function to be set.  
Up. Move selection pointer up.  
Down. Move selection pointer down.  
 
   
13  
Set clock screen  
The Set clock screen (Figure 9) is a sub screen of the User settings screen. The Set clock screen allows you to  
set the thermostat’s internal clock.  
To set the time and day, do the following:  
1. Move the cursor with the navigation arrows until the data you want to change is highlighted.  
2. Press Up (+) or Down (-) to increase or decrease the value to the desired setting.  
3. Press Set to set the time and return to the main Menu screen or wait for the screen to timeout.  
Note:  
If the clock has been reset by an extended power outage, the clock display on the Thermostat control screen will be  
blinking. Pressing Menu button will take you directly to this screen to set the clock.  
Figure 9. Set clock screen  
Set Clock  
Up (+)  
Time  
Date  
Day  
12:00 PM  
7/13/07  
Thu  
+
_
Down (-)  
Set  
Back  
Back  
Left  
Right  
Set  
Screen navigation buttons include:  
Back. Cancel and return to the User settings screen on page 12.  
Left. Move the selection box backward.  
Right. Move the selection box forward.  
Set. Set the time and return to the User settings screen on page 12.  
Up (+). Increase the selected value.  
Down (-). Decrease the selected value.  
 
   
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SmartCommand Thermostat  
Installation Manual  
Sensor calibration screen  
The Sensor calibration screen (Figure 10) is a sub screen of the User settings screen on page 12. The Sensor  
calibration screen allows you to change the temperature calibration for the internal and any external remote  
temperature sensors attached to the thermostat. 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 and the current number of degrees of offset being applied. In  
the screen, n/a indicates that the remote sensor is not attached.  
To change the temperature calibration, press Up or Down to select the internal or remote sensor. Once selected,  
press Plus (+) or Minus (-) to change the temperature calibration to the desired setting.  
Press Refresh (right blank button) to update the information on this screen.  
Note:  
When you change a temperature calibration and exit this screen, it may take a few seconds for the new temperature to  
be displayed on the Thermostat control screen on page 4.  
Figure 10. Sensor calibration screen  
Sensor Calibration  
Internal  
(75)  
n/a  
n/a  
n/a  
1
Up  
Remote 1  
Remote 2  
Remote 3  
0
0
0
Down  
Done  
+
-
Done  
Plus  
Minus Refresh  
Screen navigation buttons include:  
Done. Return to the Main menu screen on page 7.  
Plus. Increase the temperature by one degree.  
Minus. Decrease the temperature by one degree.  
Refresh. Blank button. Refresh screen temperatures.  
Up. Move selection pointer up.  
Down. Move selection pointer down.  
 
   
15  
Backlight display screen  
The Backlight display screen (Figure 11) is a sub screen of the User settings screen. The Backlight display  
screen allows you to set the backlight on and off brightness levels and contrast.  
Figure 11. Backlight display screen  
Backlite/Display  
Backlite Timeout  
ON Level  
OFF Level  
0
Up  
100%  
0%  
5
Contrast  
Down  
Done  
+
-
Select  
Done  
Plus  
Minus Select  
Screen options include:  
Backlight timeout. Set the time after the last button press that the backlight will timeout and turn off. You  
can adjust the time to 0 or from 20 to 40 seconds. If set to 0, the backlight will never timeout and will  
always be on. If set in the 20 to 40 second range, the backlight will turn off after the selected time expires.  
On level. Set the brightness of the backlight when it is on. You can adjust this setting in 10% steps, 0 to  
100%. If set to 0, the backlight will never be on. Typically this setting is set to 100%.  
Off level. Set the brightness of the backlight when off. You can adjust this setting in 10% steps, 0 to  
100%. If you do not want the backlight to go completely dark when off, you can set an off brightness to  
something greater than 0%. When you select an on or off brightness, the display changes to that level for  
you to observe the brightness setting.  
Contrast. Set the contrast level of the LCD display. You can adjust this setting from 0 to 10. Use this  
control to adjust the darkness of the display. Too light and the display looks faded, too dark and dark lines  
will appear in the display. Typically 5 is the correct setting.  
Screen navigation buttons include:  
Done. Return to the User settings screen on page 12.  
Plus. Increase the selected value.  
Minus. Decrease the selected value.  
Select. Select the function to be set.  
Up. Move selection pointer up.  
Down. Move selection pointer down.  
 
   
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SmartCommand Thermostat  
Installation Manual  
Thermostat information screen  
The Thermostat information screen (Figure 12) 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 includes:  
Wall display unit. Model and firmware version number.  
Control unit. Model and firmware version number.  
System type setting. Standard or Heat Pump (HP) HVAC system.  
Fan type setting (for standard systems). No fan with heat (gas systems) or fan with heat (electric  
systems).  
Changeover setting (for heat pump systems). Changeover with cool or changeover with heat.  
Note:  
You will see a Fan type setting for standard systems or a Changeover setting for HP systems.  
Network address setting. RS485 network address, 1 to 254 (default 1).  
Figure 12. Thermostat information screen  
Thermostat Info  
TS40R  
HFRP  
System Type:  
Fan Type:  
Network Address:  
Ver: 3.07.6P  
Ver: 03.05.2  
Standard  
No Fan w/HT  
1
Done  
Done  
Thermostat information screen has one navigation button, the Done button. Press Done to return to User  
settings screen on page 12.  
 
   
17  
Installer settings 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 screen on page 7 and press and hold the two inner control buttons for  
three seconds until the Installer settings screen (Figure 13) 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 press Plus (+) or Minus (-) to change the value.  
Figure 13. Installer settings screen  
Installer Settings  
Display Lock  
Service Mode  
Network Settings  
MaxHeat SP  
N
Up  
109  
Down  
Done  
+
-
Select  
Done  
Plus  
Minus Select  
Screen navigation buttons include:  
Done. Return to the Main menu screen on page 7.  
Plus. Increase value by 1 or change from N to Y.  
Minus. Decrease value by 1 or change from Y to N.  
Select. Select menu item to go to a submenu.  
Up. Move selection pointer up.  
Down. Move selection pointer down.  
 
   
18  
SmartCommand Thermostat  
Installation Manual  
Screen options include:  
Display lock: Y or N (default N). Use this setting to lock or unlock the thermostat wall display unit  
buttons. When the buttons are locked (Y), you can still access the Menu screen, but you will not be allowed  
to select any menu options. The Installer settings screen hidden button operation is always operational,  
allowing you to return to this screen and turn the display lock off.  
Service mode submenu: Y or N (default N). Use this setting to turn on the service mode. When the  
service mode is on (Y), it sets the thermostat to a test mode with short delays. All routine and staging  
delays are reduced to 15 seconds to speed up system checkout and testing.  
CAUTION: The compressor short cycle protection is lost in this mode.  
Network settings submenu.  
Network address: 1 to 254 (default 1). Use this setting to set the serial communication network  
address (0 and 255 are reserved addresses).  
Autosend: Y or N (default N). Use this setting to turn on the autosend. If autosend is on (Y), it sends  
a network message when there is a change in temperature, setpoints, and mode. If autosend is off (N),  
it is in polled mode and only responds to polling requests.  
Maximum heating setpoint: 10 to 109 (default 109). Set the maximum heating setpoint that is allowed.  
Will not ramp or accept setpoints higher than this maximum.  
Minimum cooling setpoint: 6 to 110 (default 6). Set the minimum cooling setpoint that is allowed. Will  
not ramp or accept setpoints lower than this minimum.  
Minimum run time: 1 to 9 minutes (default 6). Set the minimum run time before a heating/cooling  
cycle can turn off.  
Minimum off time: 5 to 9 minutes (default 6). Set the minimum off time before another heating/cooling  
cycle can begin. Five minutes minimum is the compressor short cycle protection delay.  
Delta T settings submenu. This is a submenu of the delta, or difference between, the setpoint and current  
temperature for determining when a heat or cool call comes on. Deltas are the number of degrees away  
from setpoint.  
H/C delta: 3 to 15 degrees (default 4). Set 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. In the same way, attempts to set the heating setpoint  
above the cooling setpoint will push the cooling setpoint up to maintain this separation.  
Heating delta stage 1 on: 1 to 8 degrees (default 1). Set the delta from setpoint that stage 1 heating  
starts. Stage 1 turns off at setpoint.  
Heating delta stage 2 on: 1 to 8 degrees (default 3). Set the delta from setpoint that stage 2 heating  
starts. Stage 2 turns off at setpoint.  
 
19  
Heating delta stage 3 on: 1 to 8 degrees (default 5). Set the delta from setpoint that stage 3 heating  
starts. Stage 3 turns off at setpoint.  
Cooling delta stage 1 on: 1 to 8 degrees (default 1). Set the delta from setpoint that stage 1 cooling  
starts. Stage 1 turns off at setpoint.  
Cooling delta stage 2 on: 1 to 8 degrees (default 3). Set the delta from setpoint that stage 2 cooling  
starts. Stage 2 turns off at setpoint.  
WDU settings submenu.  
Messaging enable: Y or N (default N). Enable (Y) or disable (N) the network messaging function. If  
you intend to use the messaging capability of the thermostat, you must enable it here by setting it to Y.  
Messages will then appear as a menu item in the main Menu screen and you will be able to receive and  
browse through the messages.  
CAUTION: Do not change the installer 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.  
 
20  
SmartCommand Thermostat  
Installation Manual  
Installation overview  
Before you remove an existing thermostat and install the SmartCommand thermostat, follow these guidelines:  
•
•
•
•
Record existing wiring information.  
Do the bench test.  
Check WDU wiring before applying power to the control unit.  
Be sure to install a freeze protection device as required.  
Figure 14 shows the standard thermostat wiring versus retrofit applications.  
Figure 14. Wiring overview  
4, 5, or 6 wires  
18 Ga thermostat wiring  
Heating and cooling  
system  
Old system  
X
Insert control unit  
into existing wiring  
Replace existing thermostat  
with SmartCommand WDU  
4 wires  
New system  
Heating and cooling  
system  
75  
SmartCommand WDU  
SmartCommand  
control unit  
4, 5, or 6 wires  
as original installation  
 
   
21  
Freeze protection  
WARNING: Do not use this thermostat for 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 (Figure 15).  
Figure 15. Freeze protection  
Heating system  
Mechanical thermostat  
or thermoswitch  
40 to 45°  
Red wire  
24 VAC R  
Heat W  
R
W
White wire  
Thermostat  
connections  
Wire across heater R/W terminals  
 
   
22  
SmartCommand Thermostat  
Installation Manual  
Wall display unit installation  
Choose a location for the wall display unit (WDU) that best represents the temperature of the area to be  
controlled. Avoid locations that are subject to drafts or areas with direct sunlight exposure.  
Mounting  
To mount the WDU, see Figure 16 and do the following:  
1. To open the WDU case, pull from the lower corners of the case.  
Figure 16. Opening and closing the WDU case  
Side view  
Front  
Base  
10:25  
Outside 60  
Sys Off  
Econ  
Run  
76 H  
74 C  
J2  
J1  
75  
GND  
+12V  
Clock  
Data  
G
+5  
C
No Msg  
-
MODE  
FAN  
MENU  
RUN  
+
C
D
D
Wiring access hole  
2. Route the wires to the WDU through the access hole in the back of the case (see Wiring).  
3. 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.  
4. To close the case hook the top of the WDU and rotate into the base. Be sure pins engage in the  
connector correctly  
Wiring  
For new construction, we recommend you use a two twisted-pair cable, 22 Ga minimum, to the WDU from the  
control unit. Category 5 wiring is preferred, but not required. In retrofit applications, the existing 18 Ga  
thermostat wiring (at least four wires) is adequate and usually will work without problems. However, such  
nontwisted wiring can be subject to interference due to adjacent in-wall high voltage wiring.  
To wire the WDU to the control unit, connect 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 12 VDC and provided by the control unit.  
CAUTION: Do not miswire the power and data lines, damage will result. Check your wiring before applying power.  
Remote sensor connection  
The WDU base (Figure 16) has a remote sensor connection (J2) to connect an external remote temperature  
sensor. Refer to the remote sensor documentation for the wiring diagram to connect the sensor to the WDU.  
 
       
23  
Control unit installation  
Install the 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. If you mount the control unit on the HVAC system, be careful to avoid the hot burner  
section and high vibration areas.  
The control unit is connected to the HVAC system and to the WDU unit as well as the serial communication  
and power connections.  
Control unit to WDU wiring  
Connect the WDU to the control unit with existing thermostat wiring in retrofit installations. For new  
installations, 22/24 Ga twisted-pair, typically CAT 3 or CAT 5 wiring is preferred (Figure 17).  
Figure 17. Control unit to WDU wiring  
Control unit  
Wall display unit  
J1  
GND  
+12V  
Clock  
Data  
GND  
+12 VDC  
Clock  
Data  
CAUTION: Do not miswire the power and data lines, damage will result. Check your wiring before applying power.  
Control unit to HVAC 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. Refer to your HVAC system’s  
documentation for specific information on its thermostat connections and set up requirements. You will need to  
know the following:  
HVAC system type. Gas, electric, heat pump, radiant, or hydronic.  
Fan requirement. No fan with heat or fan with heat.  
For heat pump system. Changeover with cool or with heat (O or B connection).  
Retrofit wiring  
You may find 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 SmartCommand  
installation and, in most cases, these extra wires are not required for normal HVAC system operation. See  
HVAC wiring for wiring diagrams for your type of HVAC system: standard or heat pump.  
 
         
24  
SmartCommand Thermostat  
Installation Manual  
HVAC system wiring  
Wiring will differ depending on if your system is a standard gas or electric system or if your system is a heat  
pump system.  
Standard HVAC system wiring  
Figure 18 shows the wiring diagram for a standard gas or electric HVAC system. Wiring colors are typical  
thermostat wiring color codes.  
Note:  
For typical central heating/cooling systems, leave jumper JP1 installed. If you have separate heating and cooling  
system transformers, cut jumper JP1. Wire RC to the cooling system transformer and RH to the heating system  
transformer.  
Figure 18. Standard HVAC system wiring  
Thermostat control unit  
Standard HVAC system  
FUSE  
JP1  
SW1  
STD  
S2  
1
HP  
2
Thermostat  
connections  
OFF ON  
24V COM  
24V RH  
C
R
24 VAC common  
24 VAC return  
Red (RH)  
Red (RC)  
24V RC  
White  
Orange  
Green  
W1 Heat 1  
W2 Heat 2  
G Fan  
W1 Heat stage 1  
W2 Heat stage 2  
G
Fan  
Y1 Comp 1  
Y2 Camp 2  
Yellow  
Black  
Y1 Comp stage 1  
Y2 Comp stage 2  
J4  
HVAC system  
Note:  
Wire R to either RH or RC for common transformer HVAC systems.  
 
     
25  
For standard HVAC systems, follow these guidelines:  
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 24 VAC 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 Return (red) wire to the control unit’s RH terminal and run the cooling system’s 24V Return (red) wire to  
the control unit’s RC terminal. Wire the cooling system’s 24 VAC Com to the control unit’s 24 VAC Com  
terminal. Do not connect the heating system’s common wire to the control unit.  
DIP switches  
To set the SW1 DIP switches for standard HVAC systems, do the following:  
1. Set SW1-1 (position 1) to the Off (STD) position. This is the default setting.  
2. Set SW1-2 (position 2) to the correct fan setting for your HVAC system.  
•
For gas furnaces that do not require fan output for heating operations, set SW1-2 to the Off  
position (to the left). This is the default setting).  
•
For electric furnaces that do require fan output for heating operation, set SW1-2 to On position (to  
the right).  
 
26  
SmartCommand Thermostat  
Installation Manual  
Heat pump HVAC system wiring  
Figure 19 shows the wiring diagram for a heat pump HVAC system. Wire colors are typical thermostat color  
codes.  
Note:  
Do not cut JP1 for heat pump systems. RC and RH are common for heat pumps.  
Figure 19. Heat pump HVAC system wiring  
Thermostat control unit  
Heat pump HVAC system  
FUSE  
JP1  
SW1  
STD  
S2  
1
HP  
2
Thermostat  
connections  
OFF ON  
Blue  
Red  
24C COM  
C
R
24 VAC common  
24 VAC return  
24V RH  
24V RC  
White  
Orange  
Green  
W1 Heat 1  
W2/O CO  
G Fan  
W1 Heat strips  
O Changeover valve  
G
Fan  
Y1 Comp 1  
Y2 Camp 2  
Yellow  
Black  
Y1 Comp stage 1  
Y2 Comp stage 2  
J4  
HVAC system  
 
   
27  
For heat pump HVAC systems, follow these guidelines:  
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).  
DIP switches  
To set the SW1 DIP switches for standard HVAC systems, do the following:  
1. Set SW1-1 (position 1) to the On (HP) position (to the right).  
2. Set SW1-2 (position 2) to the correct changeover (reversing valve) setting for your HVAC system:  
•
For systems with changeover with cooling, set SW1-2 to Off position (to the left). This is the  
default setting.  
•
For systems with changeover with heating, set SW1-2 to On position (to the right).  
Note:  
You must configure your changeover valve setting to work correctly with your HVAC system. Set DIP switch SW1 as  
described 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 SW1-2 to the other position.  
 
28  
SmartCommand Thermostat  
Installation Manual  
Control unit connection  
The control unit requires 24 VAC power from the HVAC system it is controlling. Connect the 24 VAC  
Common (blue wire/terminal) and 24 VAC R (red wire/terminal) from the HVAC system to the control unit’s  
HVAC system terminal block J4’s 24V Com and 24V RH (or 24V RC) terminals. The RH and RC terminals  
are connected together by JP1 (factory default).  
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 system’s 24VAC R (red wire) to the control unit’s RH terminal and  
wire the cooling systems 24VAC R (red wire) to the control unit’s RC terminal. Wire the cooling system’s  
24VAC Com to the control unit’s 24 VAC Com terminals. Do not connect the heating system’s common wire to  
the control unit.  
 
 
29  
Serial communication  
Serial communication includes:  
•
•
•
•
RS485 com port  
RS485 address  
RS485 protocol  
Thermostat network commands  
RS485 com port  
The thermostat has a RS485 serial com port. This is a two-wire (plus ground), half-duplex communication  
network. Typically, the thermostat will be used on the SmartCommand network and connected to the Smart  
Command automation controller.  
The RS485 com port communication setup is 9600 baud, 8 data bits, 1 stop bit, and no parity. Flow control is  
set to None.  
Transmission delay  
The thermostat will delay responses to request messages for 5 msec to conform to the SmartCommand 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 thermostat by pressing Menu to open the main Menu screen.  
Scroll down to the Thermostat info menu item and press Select. The Thermostat information screen on page 16  
will show the current network address of the thermostat. The default network address is 1.  
Changing the network address  
The network address is set from the Installer settings screen on page 17 on the WDU. This is a hidden menu  
and does not appear in the main Menu screen selections. To change the network address, do the following:  
1. Press Menu to open the Main menu screen on page 7.  
2. While in the Menu screen, press and hold the middle two control buttons on the WDU for five seconds  
until the Installer settings screen on page 17 opens.  
3. Scroll down to the Network menu item in the Installer settings screen 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.  
 
 
30  
SmartCommand Thermostat  
Installation Manual  
RS485 protocol  
The thermostat has a robust serial protocol. It is based on a simple ASCII message format as described in the  
Serial Communications Protocol manual, DCN: 150-00225.  
Note:  
Not all of the commands/variables defined in the protocol document are applicable to the SmartCommand thermostat,  
check Section 8 of the protocol manual for details.  
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 its display.  
The thermostat 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 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  
 
31  
System checklist  
We strongly recommend that you hook-up and run a simple bench test before installing the thermostat. Not  
only will this save you time in system checkout, but will also make you familiar with the thermostat’s  
operation.  
Thermostat bench test  
To bench test the thermostat, do the following:  
1. Connect the WDU to the control unit with a short (12 to 24 in.) four-wire cable.  
2. Before power up, set the control unit DIP switch, SW1 to ALL OFF.  
3. Connect power to the control unit.  
4. Verify the control unit status LED is blinking.  
5. Verify the WDU display comes on and shows the current temperature:  
•
•
•
If no display and backlights are not on, check your wiring to the control unit.  
If a CommFailure display is shown on the WDU, check your wiring to the control unit.  
Do not proceed until the current temperature is displayed on the WDU.  
With the current temperature displayed on the WDU, you have verified communication between the  
WDU and the control unit. Any communication problems will result in a CommFailure  
(communications failure) display on the WDU and must be fixed before proceeding.  
6. Press the Fan button on the WDU until Fan On is displayed. The control unit’s fan LED and relay  
should turn on. Press the Fan button again and the fan LED and relay should turn off.  
7. Press the Mode button on the WDU until Heat Mode is displayed.  
8. 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 come on, make sure the status LED is not flashing twice indicating  
minimum off delay. Wait until the LED stops flashing twice before proceeding.  
9. Press the Mode button on the WDU until Off Mode is displayed. The heat LED and relay will turn off.  
10. Wait six minutes for the minimum off delay to expire. The status LED will stop flashing twice.  
11. Press the Mode button on the WDU until Cool Mode is displayed.  
12. Press the setpoint Down button until the setpoint is below the current temperature. The compressor and  
fan LEDs and relays should turn on.  
13. Press the Mode button on the WDU until Off Mode is displayed. The cool LED and relay should turn  
off.  
When you have successfully completed this process, you have verified that the thermostat is working correctly.  
 
   
32  
SmartCommand Thermostat  
Installation Manual  
Serial communication test  
Connect the thermostat to a PC via an RS232/485 converter to a PC serial com port.  
Note:  
Any RS232 to RS485 adapter used with SmartCommand serial thermostats must have automatic send data control.  
To use Windows HyperTerminal, do the following:  
1. Set up a direct connection session to the com port you will be using on the PC.  
2. Configure port settings to 9600 baud, 8 bit, no parity, 1 stop bit, and no flow control.  
3. Under the Settings tab, go ASCII setup.  
4. Set ASCII sending to Echo characters and No delays.  
5. Set ASCII receiving to Append line feeds and Wrap lines.  
Note:  
Serial ASCII commands are case sensitive.  
Verify serial communication by typing the following command sequence:  
A=1 R=1 <cr>  
The Thermostat should reply with the R1 status message:  
A=00 O=1 T=xx SP=xx SPC=xx SPH=xx M=xx FM=x  
If you have problems communicating, check addresses and port settings.  
 
 
33  
HVAC system testing  
If you have difficulty with the HVAC system operation, you can do the following test to verify the HVAC  
system is operational.  
Thermostats, like the SmartCommand thermostat, are just switches to the HVAC system as shown in the  
Figure 20. This is a simplified example of a thermostat and a standard HVAC wiring diagram. You can test the  
HVAC system operation by duplicating the thermostat switch operation by shorting across the thermostat  
terminals on the HVAC system.  
Figure 20. HVAC system wiring example  
HVAC system (standard gas/AC)  
Typical thermostat  
Thermostat  
connection  
C 24 VAC common  
R 24 VAC hot  
24 VAC  
G Fan  
Fan  
Fan relay  
Gas valve  
W Heat  
Heat  
Y Comp  
Comp  
Comp relay  
Note:  
The HVAC system and thermostat connection voltage is 24 VAC. This is a safe voltage to work with, but be careful to  
avoid shorting the 24 VAC common (C) and 24 VAC return (R) terminals. This may blow a fuse in the HVAC system.  
 
   
34  
SmartCommand Thermostat  
Installation Manual  
Standard HVAC system quick test  
You can do a quick test of the HVAC system by shorting across the appropriate terminals on the HVAC  
system’s thermostat connector. Use a short 6-in. wire to connect across the terminals shown in Table 1.  
Table 1. Standard system quick test  
Function test  
Fan  
HVAC terminals  
R to G  
Result  
Fan should come on.  
Heating  
Cooling  
R to W  
Heat cycle should start for heating.  
Compressor and fan should start for cooling.  
R to Y and G  
Heat pump system quick test  
You can do a quick test for heat pump operation by shorting across the appropriate terminals on the heat pump  
system’s thermostat connector. Note that heat pumps have an additional thermostat terminal (O) for the  
changeover valve. The changeover valve determines whether heating or cooling is provided. Typical heat  
pump systems have changeover with cooling and require the O terminal to be powered to get cooling  
operation. Use a short 6-inch wire to connect across the terminals as shown in Table 2.  
Table 2. Heat pump system quick test  
Function test  
Fan  
HVAC terminals  
R to G  
Result  
Fan should come on.  
Heating  
Cooling  
R to Y and G  
R to Y and G and O  
Compressor and fan should start and heating occurs.  
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 DIP  
switch SW1-2 changeover setting to correct this problem.  
 
   
35  
Control unit wiring  
Figure 21 shows the control unit wired to a wall display unit and the HVAC system. Wire colors are typical  
thermostat wiring colors. The fuse is a mini ATO 2 amp.  
Note:  
For heat pump HVAC systems, the orange wire (O) is the changeover valve.  
Figure 21. Control unit wiring  
Control unit  
HVAC system  
Fuse  
SW1  
1
2
STD  
S2  
HP  
Wall display unit  
JP1  
24V COM  
OFF ON  
J1 WDU  
GND  
Blue  
Red  
Status  
GND  
+12VDC  
Clock  
C-24VAC common  
R-24VAC return  
24V RH  
24V RC  
12V  
C
Heat 1  
W1  
White  
Orange  
Green  
Heat 2  
CO  
Fan  
W1-Heat stage 1  
W2/O-Heat stage 2  
Data  
D
W2/O  
G
GND  
GND  
D+  
G-Fan  
Y1-Comp stage 1  
Comp 1  
Comp 2  
Yellow  
Black  
Y1  
Y2  
RS-485 Data +  
RS-485 Data -  
Y2-Comp stage 2  
D-  
J2 RS-485  
J4 HVAC system  
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 24 VAC Com to the control  
unit’s 24 VAC Com terminal. Do not connect the heating system’s common wire to the control unit.  
 
   
36  
SmartCommand Thermostat  
Installation Manual  
DIP switch SW1 settings  
White indicates a switch is in the On position. Set the DIP switches as follows:  
SW1-S1. HVAC system type selection. Standard or heat pump.  
Set S1 to Off (STD) for gas/electric systems (default setting).  
Set S1 to On (HP) for heat pump systems.  
SW1-S2. This is a dual-use switch that depends on the switch S1 setting.  
If S1 is set to Standard HVAC system type, then S2 selects the HVAC fan type.  
Set S2 to Off for gas systems that normally do not require fan w/heat operation (default setting).  
Set S2 to On for electric systems that normally do require fan w/heat operation.  
If S1 is set to Heat pump operation, then S2 selects the changeover valve operation.  
Set S2 to Off for changeover with cooling (default setting).  
Set S2 to On for changeover with heating.  
If the heat pump supplies heating when you expect cooling or vice versa, change the SW1-S2 switch.  
 
37  
Serial network command and variable list  
Refer to the Serial Communications Protocol Manual 150-00225 for format details.  
Network commands  
Table 3 shows the network commands and a description of each command.  
Table 3. Network commands  
Command  
BF  
Description  
Set setback flag  
CFM  
Date  
DL  
Set F or C temperature mode  
Set date  
Set display lock  
DOW  
F
Set day of week  
Set fan mode  
M
Set system mode  
OT  
Set outside air temperature data (for network supplied OT)  
Set schedule control run/hold mode  
Set schedule entry for day and entry  
Set setpoint (for single setpoint system)  
Set cool setpoint  
SC  
SEd/x  
SP  
SPC  
SPH  
SVx  
Time  
R=1  
R=2  
R=3  
R=4  
R=5  
R=6  
R=7  
R=8  
R=9  
Set heat setpoint  
Set variable number x  
Set time  
Request status message 1: Thermostat data (temperature, setpoints, modes)  
Request status message 2: HVAC operation data (heating/cooling/fan status)  
Request status message 3: Temperature data only  
Request status message 4: Setpoint data only  
Request status message 5: Mode data only  
Request status message 6: WDU/Control unit model/version data  
Request status message 7: Time and DOW  
Request status message 8: Not used  
Request status message 9: HVAC system setup data (SW1 settings)  
 
     
38  
SmartCommand Thermostat  
Installation Manual  
Network variables  
Table 4 shows the network variables for use with the system variable, SVx command.  
Table 4. Network variables  
Variable  
number  
Name  
Variable data  
0, 1  
Default value  
Notes  
1
System type  
Fan type  
0
0 = gas/electric, 1 = heat pump  
0 = gas (no fan w/heat), 1 = electric  
0 = c/o w/cool, 1 = c/o w/heat  
0 = Centigrade, 1 = Fahrenheit  
Reserved: 0 = host, 255 = global  
0 = unlocked, 1 = locked  
0 = 20-second test time  
2
0, 1  
0
3
Changeover type  
C/F type  
0, 1  
0
4
0, 1  
0
5
Network address  
Display lock  
1 to 254  
1
9
0, 1  
0
10  
11  
12  
14  
16  
18  
20  
24  
69  
74  
MOT  
5 to 9 minutes  
0 to 9 minutes  
0 to 8 degrees  
0 to 8 degrees  
0 to 8 degrees  
0 to 8 degrees  
0 to 8 degrees  
3 to 15 degrees  
6 minutes  
6 minutes  
1 degree  
3 degrees  
5 degrees  
1 degree  
3 degrees  
4 degrees  
0
MRT  
0 = 20-second test time  
H delta stage 1 on  
H delta stage 2 on  
H delta stage 3 on  
C delta stage 1 on  
C delta stage 2 on  
Setpoint h/c delta  
Minimum delta T between h/c setpoints  
1 = test mode, sets MRT/MOT = 20 seconds  
0 = off, 1 = on, send temp/mode on change  
Service (test) mode 0, 1  
Autosend mode 0, 1  
0
The system type, fan type, and changeover type variables are determined by the controller DIP switch SW1  
setting. They can be viewed by the system variable command, but cannot be changed from the network.  
 
   
39  
Contacting technical support  
For assistance installing, operating, maintaining, and troubleshooting this product, refer to this document and  
any other documentation provided. If you still have questions, you may contact technical support during  
normal business hours (Monday through Friday, excluding holidays, between 6 a.m. and 5 p.m. Pacific Time).  
Table 5. Sales and support contact information  
Sales  
Technical support  
Phone:  
Toll-free: 888.GESECURity (888.437.3287 in the US, including Alaska and Hawaii; Puerto Rico; Canada).  
Outside the toll-free area: 503.885.5700.  
E-mail  
Fax  
[email protected]  
[email protected]  
800.483.2495  
541.752.9096 (available 24 hours a day)  
Note:  
Be ready at the equipment before calling for technical support.  
Online publication library  
Another great resource for assistance with your GE Security products is our online publication library,  
available to all of our customers on our website. To access our publication library, go to our website at the  
following location:  
http://www.gesecurity.com  
In the Tools area at the top, click the Publication Library link. After you register and log on, you may search  
1
through our online library for the documentation you need.  
1. Many GE Security documents are provided as PDFs (portable document format). To read these documents, you will need  
Adobe Acrobat Reader, which can be downloaded free from Adobe’s website at www.adobe.com.  
 
   
40  
SmartCommand Thermostat  
Installation Manual  
 

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