System information

DCN: 141-01070-03 TR40 Thermostat Manual 8
raising the heating setpoint above the cooling setpoint. Again the thermostat will “push” the
cooling setpoint up to maintain the 3 degree separation.
EH Mode: Only available 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.
Main Thermostat Screen
Main Thermostat 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. Pushing the FAN button once will turn the manual fan
operation On. Pushing 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.
Fan Button
§ Auto
§ On
Main Thermostat 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
§ Run
§ Hold
§ Away
(Press and hold button)
Main Thermostat Screen LED Displays
The Main Thermostat screen has the following LEDs, 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 1
st
stage heating or cooling only
o LED On, “2
nd
Stg” displayed > Stage 2 heating or cooling is active
o LED On, “3
rd
Stg” displayed > Stage 3 heating is active
RUN
AUTO
FAN
OFF
MODE
MENU
RUN
AUTO
FAN
OFF
MODE
MENU