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B. Override Button
The Override button is used to force the thermostat from Un-
occupied mode into the Occupied mode comfort settings when
used with dry contacts and an external device. The Override
period will be set at 30 minutes. The thermostat will then
return to Unoccupied mode. To increase the amount of time
in Override mode, press the Override button again. Thirty
minutes of override time will be added for each time the Over-
ride button is pressed up to a maximum of 4 hours. After the
4-hour limit has been reached, press the Override button again
to cancel Override mode.
While in Override mode, the Override icon and the Occupied
icon will be displayed on the thermostat. The time of day and
the minutes remaining in Override mode will alternate on
the thermostat display.
The set points are adjustable with the UP ARROW and DOWN
ARROW keys during Override mode.
NOTE: The Unoccupied mode is configured by the installer.
IV. THERMOSTAT INNER PANELS BUTTONS
The thermostat has inner panel buttons which are used to
change the configuration of the thermostat, set the mode, and
reset the filter. The buttons are accessible from underneath
the thermostat cover. To access the inner panel buttons, pull
on the hinged thermostat cover. See Fig. 3. The program-
ming buttons are: Mode, Fan, Emergency Heat, Backlight,
and Reset Filter.
The UP ARROW and DOWN ARROW buttons are used to
choose configuration settings. The buttons are also used to
answer yes or no.
A. Mode Button Operation
The Mode button selects the operating mode of the thermo-
stat. If OFF is selected, the thermostat will not enter Heat-
ing or Cooling mode. If HEAT is selected, the thermostat will
only enter Heating mode (if the room temperature is below
the heating set point). If COOL is selected, the thermostat
will only enter Cooling mode (if the room temperature is above
the cooling set point). If AUTO is selected, the thermostat will
enter Heating or Cooling mode based on the room tempera-
ture and the heating and cooling set points.
Auto-Changeover
When the thermostat mode is set to AUTO, the thermostat
will provide automatic changeover from Heating to Cooling
mode and Cooling to Heating mode when required. The ther-
mostat will automatically switch to maintain the desired tem-
perature setting. The thermostat does not need to be manu-
ally changed from heating to cooling or cooling to heating
operation.
B. Fan Button Operation
The Fan button selects fan operation. When the fan is set to
FAN ON, the fan will run continuously for improved air
circulation.
NOTE: When the thermostat is in Unoccupied mode (with
Dry Contact Switch), the fan will run only during heating or
cooling operation, even if the fan is set to FAN ON.
When the fan is not set to FAN ON (no icon displayed on ther-
mostat screen), the fan will run during heating and cooling
operation only.
C. Emergency Heat Button
Emergency heat is available for heat pump applications. To
turn on emergency heat, press the Emergency Heat button.
Fig. 2 — Thermostat Front Panel Buttons
Fig. 3 — Thermostat Inner Panel Buttons
An ''EH'' will be displayed. During emergency heat, the fan
will operate and the second stage of heat will be energized
(locking out the first stage compressor). To exit emergency
heat, press the Emergency Heat button. During emergency
heat, only OFF and HEAT modes are available.
D. Backlight Button
The Backlight button is used to change the setting of the Back-
light display. If the configuration is set to Yes, the backlight
will be lit continuously. If the configuration is set to No, the
display will be lit only after a button is pushed. The display
will stay lit until action has ceased.
E. Reset Filter Button
The Reset Filter button is used by the service person to reset
the Service Filter icon display.
If the Reset Filter button is pressed during normal thermo-
stat operation, the number of hours of fan operation is
displayed.
F. Keypad Lock
The thermostat has a keypad lockout feature which will not
acknowledge front panel buttons until the lockout sequence
is entered. To disable or lock the keypad, press and hold the
Mode button. While holding down the Mode button, press the
UP and DOWN ARROW buttons simultaneously. The ''Locked''
icon will appear on the display.
The thermostat is unlocked by performing the same proce-
dure. Press and hold the Mode button. While holding down
the Mode button, press the UP and DOWN ARROW buttons
simultaneously. The ''Locked'' icon will be removed from the
display.
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