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2. Pressing the FAN button alternately selects AUTO or ON fan
operation. Fan annunciator displays the current selection.
3. Pressing the MODE button will select OFF, HEAT, COOL,
and AUTO. Heat pumps also have an EHEAT mode. Mode
annunciator displays the current selection.
4. Operation of other buttons is explained in the Homeowner's
Guide.
Step 6—Check Thermostat Operation
SELECT HOLD
1. Press HOLD button to select "hold" feature. This will prevent
the setpoint from changing until the desired time/temperature
schedule is entered.
FAN OPERATION
1. Press FAN button, starting fan operation. Fan annunciator
switches from AUTO to ON.
2. Press FAN button, stopping fan operation. Fan annunciator
switches from ON to AUTO.
HEATING OPERATION
1. Press MODE button until HEAT is displayed under the mode
annunciator.
2. Press up button until LCD readout reads 10 degrees above
room temperature. Heating system should begin to operate
within 7 minutes.
COOLING OPERATION
1. Press MODE button until COOL is displayed under the mode
annunciator.
2. Press down button until LCD readout reads 10 degrees below
room temperature. Cooling system should begin to operate
within 7 minutes.
Step 7—Select Desired Operation
1. Press FAN button to select AUTO or ON position. Fan
annunciator displays current selection.
2. Press MODE button to select OFF, HEAT, COOL, AUTO.
Heat pumps will also have an EHEAT mode. Mode annun-
ciator displays current selection.
3. Press up or down buttons to select desired temperature.
4. If daily cycles are to be programmed now, refer to Homeown-
er's Guide for programming instructions.
5. If thermostat has not been programmed, press HOLD button to
retain desired temperature setting.
NOTE: If HOLD button is not left ON, temperature setting will
be lost until time/temperature program is entered.
Step 8—Checklist
1. Put away tools and instruments, and clean up debris.
2. Review Homeowner's Guide with owner.
3. Leave literature packet with owner.
MODEL AC
THERMOSTAT
24 VAC HOT
R
FAN
G
HEAT STAGE 1
W/W1
COOL STAGE 1
Y/Y2
N/A
O/W2
N/A
Y1/W2
24 VAC COMM.
C
N/A
B
L
N/A
S1
OUTDOOR
SENSOR
S2
CONNECTION
Fig. 2—Single-Speed Air Conditioner with Single-
Stage Furnace
MODEL AC
THERMOSTAT
24 VAC HOT
R
FAN
G
HEAT STAGE 1
W/W1
COOL STAGE 1
Y/Y2
N/A
O/W2
N/A
Y1/W2
24 VAC COMM.
C
N/A
B
L
N/A
S1
OUTDOOR
SENSOR
S2
CONNECTION
Fig. 3—Single-Speed Air Conditioner with 2-Stage
or Variable-Speed Furnace
3
SINGLE-STAGE
SINGLE-SPEED
FURNACE
AIR CONDITIONER
R
G
W
Y
Y
C
C
A94217
TWO-STAGE OR
SINGLE-SPEED
VARIABLE-SPEED
AIR CONDITIONER
FURNACE
R
G
W/W1
Y/Y2
Y
W2
C
C
See note 1
A94218
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