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mode when the combustion air inducer is operating and
the pressure switch is closed. Any humidifier rated up to
0.5 amp can be connected to this terminal with the ground
leg of the circuit connected to ground or the "C" terminal.
(Refer to speci c thermostat and outdoor unit.)
Thermostat
Furnace
POWER
R
HEAT
W1
COOLING
Y
INDOOR BLOWER
G
COMMON
C
Figure 55. Furnace & Condensing Unit Thermostat
Designations
Install the room thermostat according to the instructions
provided with the thermostat. See Figure 55 for thermostat
designations. If the furnace is being matched with a
heat pump, refer to the FM21 installation instruction or
appropriate dual fuel thermostat instructions.
507735-03
Condensing
Unit
*CONDENSING
R
W
CONDENSING
Y
G
CONDENSING
C
Figure 56. Typical Field Wiring Diagram
Indoor Blower Speeds
1.
When the thermostat is set to "FAN ON", the indoor
blower will run continuously on the fan speed when
there is no cooling or heating demand. See Table 17
for allowable continuous circulation speeds.
2.
When the furnace is running in the heating mode, the
indoor blower will run on the heating speed.
3.
When there is a cooling demand, the indoor blower will
run on the cooling speed.
Generator Use - Voltage Requirements
The following requirements must be kept in mind when
specifying a generator for use with this equipment:
•
The furnace requires 120 volts ± 10% (Range: 108
volts to 132 volts).
•
The furnace operates at 60 Hz ± 5% (Range: 57 Hz
to 63 Hz).
•
The furnace integrated control requires both polarity
and proper ground. Both polarity and proper grounding
should be checked before attempting to operate the
furnace on either permanent or temporary power.
•
Generator should have a wave form distortion of less
than 5% THD (Total Harmonic Distortion).
Issue 1933
Page 35 of 53
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