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G. Low Ambient Cooling Lockout Selection
The Low Ambient Cooling Lockout feature will lock out cool-
ing mode if the outdoor-air temperature is below the lockout
cooling temperature (user-configured).
NOTE: This configuration is not available if DIP switch C (Re-
mote Room Sensor) is set to ON or if the outdoor-air sensor is
in error.
The default is OF (disabled). The lockout temperature can be
set to OF (disabled) or 20 to 60 F in 5-degree increments (en-
abled). To configure the selection, press the Program button
in the configuration mode. Use the Up and Down buttons to
increase or decrease the setting.
V. CHECK THERMOSTAT OPERATION
Perform the following procedure to check thermostat
operation:
1. Press the Hold button. This will prevent the set point
from changing until the desired time and temperature
schedule is entered.
2. Press the Fan button to switch the fan annunciator from
AUTO to ON. The fan should run continuously. Check
fan operation. Press the fan button again to switch back
to AUTO.
3. Press the mode button repeatedly until HEAT is dis-
played in the mode annunciator. Press the Up button
until the set point reads 10 degrees above room tem-
perature. The heating system should begin to operate
within 5 minutes.
4. Press the mode button repeatedly until COOL is dis-
played in the mode annunciator. Press the Down button
until the set point reads 10 degrees below room tem-
perature. The cooling system should begin to operate
within 5 minutes.
VI. SELECT THERMOSTAT OPERATION SETTINGS
Thermostat operation should be configured. Set the Fan and
Mode configurations to their desired settings. Press the Up
and Down buttons to select the desired comfort temperature.
NOTE: Daily schedules can be programmed by the installer
or the user. A detailed explanation of the schedule program-
ming is in the Owner’s Guide. If the daily schedules of the
thermostat are being configured, refer to the thermostat own-
er’s guide literature.
VII. FINAL CHECKLIST
1. Put away tools and instruments. Clean up debris and
packaging.
2. Review Owner’s Guide with occupant or owner.
3. Leave Owner’s Guide with occupant or owner.
OPERATION
I. HOLD, FAN, AND MODE BUTTON OPERATION
Pressing the Hold button disables the time and temperature
schedule and holds the current desired temperature set point.
When a Hold is active, the HOLD annunciator is displayed
on the thermostat screen. To release the Hold, press the Hold
button a second time.
The Fan button selects fan operation. When the fan is set to
ON, the fan will run continuously. When the fan is set to AUTO,
the fan will run during heating and cooling operation only.
The Mode button selects the operating mode of the thermo-
stat. If OFF is selected, the thermostat will not enter heating
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). IfAUTO is selected, the thermostat will
enter heating or cooling mode based on the room tempera-
ture and the heating and cooling set points. Heat pumps also
have an EHEAT selection. If EHEAT is selected, the heat pump
will use the second stage of heating to provide heat when
needed. The annuciator for each selection will be displayed
on the thermostat when selected.
II. FIVE-MINUTE COMPRESSOR SHORT-CYCLE
PROTECTION
The timer prevents the compressor from starting until it has
been off for at least 5 minutes. The short-cycle protection func-
tion can be disabled (for one cycle only) by simultaneously
pressing the Fan button and the Up button.
III. FIFTEEN-MINUTE CYCLE TIMER
The cycle timer prevents the start of a heating or cooling cycle
until at least 15 minutes after the last start of the same cycle.
This function keeps the equipment from being cycled more
than 4 times in one hour. The cycle timer can be disabled (for
one cycle only) by either changing the temperature set point
or by simultaneously pressing the Fan button and the Up
button.
IV. FIFTEEN-MINUTE STAGING TIMER
When multi-stage heating or cooling is used, the staging timer
prevents any higher stage from energizing until at least
15 minutes has passed from the start of the previous stage.
The timer is disabled if the temperature demand is greater
than 5 degrees.
V. TWO-MINUTE MINIMUM ON TIME
In normal operation, when a stage is energized, it must re-
main on for at least 2 minutes.
VI. HEATING/COOLING SET POINT MINIMUM
DIFFERENCE
A minimum difference of 3 degrees is enforced between the
heating and cooling set points. The thermostat will not allow
the set points to be set within 3 degrees of each other.
VII. AUTO-CHANGEOVER TIMER
When the auto-changeover mode is selected, the thermostat
will not change from heating to cooling or cooling to heating
until an opposite demand has existed for a minimum of
10 minutes. The timer is disabled if the heating or cooling
set point is changed.
VIII. POWER-ON THERMOSTAT CHECK
When power is applied to the thermostat, all possible display
annunciators are turned on for a few seconds. The thermo-
stat then indicates the current mode and configuration infor-
mation with a 2-digit code. The following codes can be dis-
played: AC — single-speed air conditioner, HP — single-
speed heat pump, A2 — two-speed air conditioner, and H2 —
two-speed heat pump.
IX. ERROR CODES
The thermostat will display the following error codes if er-
rors are detected:
E1 — If the thermostat cannot properly read room tempera-
ture, the thermostat will display an E1 and all outputs (ex-
cept the fan if on), will be deenergized.
E2 — If the AC line voltage drops below the minimum level,
all outputs are deenergized and the thermostat will display
an E2. The E2 error will remain until proper line voltage has
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