of the circuit being connected to one of the provided neutral terminals. If an accessory rated at greater than one amp is connected to this terminal, it is necessary to use an exter- nal relay.
One line voltage adeterminnal is provided on the furnace integrated control. See figure 21 for integrated control configuration. This terminal is energized in the heating mode when the combustion air inducer is operat- ing. Any humidifier rated up to one amp can be connected to this terminal with the neutral leg of the circuit being con- nected to one of the provided neutral terminals. If a humidi- fier rated at greater than one amp is connected to this termi- nal, it is necessary to use an external relay relay.
One 24V "H" 1/4" spade terminal is provided on the furnace integrated control. See figure 21 for integrated control con- figuration. The terminal is energized in the heating mode when the combustion air inducer is operating and the pres- sure 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.
Generator Use − Voltage Requirements
The following requirements must be kept in mind when specifying a generator for use with this equipment:
SThe furnace requires 120 volts + 10% (Range: 108
volts to 132 volts).
SThe furnace operates at 60 Hz + 5% (Range: 57 Hz to 63 Hz).
SThe furnace integrated control requires both proper polarity and proper ground. Both polarity and proper grounding should be checked before attempting to op- erate the furnace on either permanent or temporary power.
SGenerator should have a wave form distortion of less than 5% total harmonic distortion (THC).
Thermostat
Install the room thermostat according to the instructions provided with the thermostat. See table 9 for thermostat designations. If the furnace is being matched with a heat pump, refer to the FM21 installation instruction or appropri- ate dual fuel thermostat instructions.
Indoor Blower Speeds
1 − When the thermostat is set to AN ON," the indoor blower will run continuously on the low heat speed when there is no cooling or heating demand.
2 − When the EL280DF is operating in the high−fire or low− fire heating mode, the indoor blower will run on the cor- responding heating speed.
3 − When the EL280DF is operating in the low cool or the high cool cooling mode, the indoor blower will run on the corresponding cooling speed.
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