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one amp is connected to this terminal, it is necessary to
use an external relay. See Figure 61 for control board
configuration. This terminal is energized in the heating
mode when the combustion air inducer is operating.
Install the room thermostat according to the instructions
provided with the thermostat. See Figure 57 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.
Figure 57. Furnace and Condensing Unit Thermostat
Designations
Page 36 of 51
Figure 58. Typical Field Wiring Diagram
Issue 1917
Indoor Blower Speeds
1.
When the thermostat is set to "FAN ON", the indoor
blower will run continuously on the heating speed
when there is no cooling or heating demand.
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).
507271-02
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