507270-03 Page 43 of 60Issue 1917
use an external relay. See Figure 68 for control board
conguration. 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 65 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 65.
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 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 proper
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).
Figure 66.
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