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OPERATION
I. 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.
A. Auto-Changeover
When the thermostat mode is set to AUTO, the thermo-
stat will provide automatic changeover from Heating to Cool-
ing mode and Cooling to Heating mode when required. The
thermostat will automatically switch to maintain the desired
temperature setting. The thermostat does not need to be manu-
ally changed from heating to cooling or cooling to heating
operation.
II. FAN BUTTON
The Fan button is used to configure fan operation. Fan
operation can be set to Fan On or Auto (no icon displayed).
When the fan is set to Fan On, the fan will run continuously
for better air circulation.
NOTE: If the thermostat is in Unoccupied mode, the fan will
run only during heating or cooling.
When the fan is set to Auto (no icon displayed), the fan will
only energize during heating or cooling operation.
III. EMERGENCY HEAT BUTTON
Emergency heat is available for heat pump applications. To
turn on emergency heat, press the Emerg. Heat button. An
''EH'' will be displayed. During emergency heat, the fan will
operate and the second stage of heat will be energized (lock-
ing out the first stage compressor). To exit emergency heat,
press the Emerg. Heat button. During emergency heat, only
OFF and HEAT modes are available.
IV. 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.
V. RESET FILTER BUTTON
The Reset Filter button is used to reset the Service Filter icon
display while in the Advanced Setup Configuration Step 10.
If the Reset Filter button is pressed during normal ther-
ostat operation, the number of hours of fan operation is
displayed.
VI. OVERRIDE BUTTON
The Override button is used to force the thermostat from Un-
occupied mode into the Occupied mode comfort settings. 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 Override 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 Oerride mode.
NOTE: The Override button can only be used if the dry
contact is used to control an Occupied and Unoccupied
schedule.
VII. ELECTRIC HEAT
When the Electric Heat option in the Advanced Setup is set
to ON, the thermostat will turn on the fan immediately any
time there is a heat demand. This feature should only be used
on electric heating applications. Do not use with gas heat.
VIII. TWO-STAGE OPERATION
The second stage of heat or cool is turned on when the first
stage has been on for a minimum of 2 minutes and the tem-
perature differential from the set point is equal to or greater
than the set point plus the deadband plus 2 degrees.
IX. REMOTE TEMPERATURE SENSOR
A remote temperature sensor is available to read the tem-
perature from a space. If a remote temperature sensor is con-
nected, the thermostat will ignore the reading of its internal
sensor. When the thermostat is using a reading from a re-
mote sensor, the degree symbol above the temperature read-
ing will blink.
X. KEYPAD LOCK
To prevent unauthorized use of the thermostat, the front panel
buttons can be disabled. To disable or lock the keypad, press
and hold the Mode button. While holding down the Mode but-
ton, press the UP and DOWN ARROW buttons simulta-
neously. 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.
XI. DRY CONTACT SWITCH/EXTERNAL CONTROL
A dry contact switch is provided to allow an external device
to force the thermostat into Unoccupied mode. When the ther-
mostat is forced into Unoccupied mode via the dry contact
closure, the Unoccupied icon will blink each second. The
external device is wired to contacts CK1 and CK2. See
Fig. 5.
A. Soft Start
When multiple thermostats are controlled by the same exter-
nal device, a Soft Start option can be used to stagger the start
times of the HVAC equipment. This feature may cause a
delay in operation after entering Unoccupied mode.
EXTERNAL
THERMOSTAT
DEVICE
CK1
CK2
NOTE: Do not cross wiring.
Fig. 5 — Typical Dry Contact Switch Wiring
—6—
THERMOSTAT
THERMOSTAT
CK1
CK1
CK2
CK2
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