N92MSN: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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could cause this fuse to blow. If fuse replacement is required, use ONLY
a 3-amp. fuse of identical size. See Fig. 37.
ACCESS0RIES
(See Fig. 36 and Fig. 37)
1. Electronic Air Cleaner (EAC)
Connect an accessory Electronic Air Cleaner (if used) using 1/4-in.
female quick connect terminals to the two male 1/4-in.
quick-connect terminals on the control board marked EAC-1 and
EAC-2. The terminals are rated for 115VAC, 1.0 amps maximum
and are energized during blower motor operation.
2. Humidifier (HUM)
Connect an accessory 24 VAC, 0.5 amp. maximum humidifier (if
used) to the 1/4-in male quick-connect HUM terminal and
COM-24V screw terminal on the control board thermostat strip.
The HUM terminal is energized when the pressure switch closes
during a call for heat (See Fig. 36).
NOTE: DO NOT connect furnace control HUM terminal to HUM
(humidifier) terminal on humidity sensing thermostat, zone controller or
similar device. See humidity sensing thermostat, zone controller,
thermostat, or controller manufacturer’s instructions for proper
connection.
NOTE: For 24V & 115V EAC or Humidifier Accessory details, see
Accessory instructions.
Alternate Power Supplies
This furnace is designed to operate on utility generated power which has
a smooth sinusoidal waveform. If the furnace is to be operated on a
generator or other alternate power supply, the alternate power supply
must produce a smooth sinusoidal waveform for compatibility with the
furnace electronics. The alternate power supply must generate the same
voltage, phase, and frequency (Hz) as shown in Table 12 or the furnace
rating plate.
Contact the alternate power supply manufacturer for specifications and
details.
Power from an alternate power supply that is non-sinusoidal may
damage the furnace electronics or cause erratic operation.
A11157
Fig. 36 – Field-Supplied Isolation Relay for Humidifiers with
Internal Power Supply
A210192
Fig. 37 – Example of Single Stage Furnace Control
A200519
Fig. 38 – Thermostat Wiring Diagrams
Notes for thermostat wiring diagrams
1. Refer to outdoor equipment Installation Instructions for additional
information and setup procedure.
2. Outdoor Air Temperature Sensor must be attached in all dual fuel
application.
3. Refer to ICP thermostat Installation Instructions for additional
information and setup procedure.
4. When using a Humidity Sensing Thermostat, set DEHUMIDIFY
OPTIONS to H DE-ENRGZD FOR DEHUM
5. HUM 24VAC terminal is 24 VAC and is energized when the low
pressure switch closes during a call for heat.
Single--Stage Furnace with Single Stage Air
Conditioner
NOTE 9
Single--Stage Furnace with Single--Stage Heat Pump
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