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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.
1
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:
BoldMenu items and buttons.
ItalicEmphasis 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.
MonospaceText that displays on the computer screen.
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.
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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
LEDs
10:25 AM
s Off
S
Econ
Run
No Msg
MENU
Outside 60
75
MODE
Control buttons
FAN
76 H
74 C
Up button
Down button
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.
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.
3
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 contr ol 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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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
LED
Display
10:25 AM
s Off
S
Econ
Run
No Msg
MENU
Menu
Outside 60
75
MODE
Mode
FAN
Fan
76 H
74 C
Run/Hold
Up
Down
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.
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
5
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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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.
seconds. In the away mode, the setpoints are changed to preset temperatures: 66°F heating and 80°F cooling.
There is also an away mode that you can select if you press and hold the
Run
button for three
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 displa yed. 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 Failure at 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.
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
User Settings
Thermostat Info
Done
Select
Up
Down
7
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.
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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
Done Delete Previous
Del
Prev
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.
Next
Next
Schedule setup screen
The Schedulesetup 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 Schedulesetup 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
Done
Select
Up
Down
9
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.
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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
Day 9:00 A 68 84
Eve 5:00 P 74 76
Nite 10:00 P 70 78 C
Done
Next
+
_
Up (+)
Down (-)
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.
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