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506501-01 Page 35 of 48Issue 1031
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: 180 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% RHD
terminals. If a humidifier rated at greater than one amp is
connected to this terminal, it is necessary to use an external
relay. See Figure 54 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 51 for thermostat
designations. If the furnace is being matched with a help
pump, refer to the FM21 installation instruction or appropriate
dual fuel thermostat instructions.
FURNACE & CONDENSING UNIT
THERMOSTAT DESIGNATIONS
(Refer to specific thermostat and outdoor unit.)
Figure 51
TYPICAL FIELD WIRING DIAGRAM
Figure 52
WARNING:
ELECTRIC SHOCK HAZARD, CAN CAUSE INJURY
OR DEATH. UNIT MUST BE GROUNDED IN
ACCORDANCE WITH NATIONAL AND LOCAL CODES
NOTE:
IF ANY WIRE IN THIS APPLIANCE IS REPLACED, IT
MUST BE REPLACED WITH WIRE OF LIKE SIZE,
RATING, INSULATION THICKNESS AND
TERMINATION
FIELD SUPPLIED ACC. WIRE
S145 IS USED WITH HONEYWELL GAS VALVE
WHEN APPLIED IN LP GAS UNITS