Unit installation

DCN: 141-00885-16 1/26/06 TZ40 Thermostat Manual 6
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.
Fan Button
§ Auto
§ 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
§ Run
§ Hold
§ Away
(Press and hold button)
RUN
AUTO
FAN
OFF
MODE
MENU
RUN
AUTO
FAN
OFF
MODE
MENU