9
ELECTRICAL CONNECTIONS
Wiring Harness
The wiring harness is an integral part of this furnace.
Wires are color coded for identification purposes. Refer to
the wiring diagram for wire routings. If any of the original
wire as supplied with the furnace must be replaced, it must
be replaced with wiring material having a temperature
rating of at least 105° C. Any replacement wiring must be a
copper conductor.
115 Volt Line Connections
Before proceeding with electrical connections, ensure that
the supply voltage, frequency, and phase correspond to
that specified on the unit rating plate. Power supply to the
furnace must be NEC Class 1, and must comply with all
applicable codes. The furnace must be electrically grounded
in accordance with local codes or, in their absence, with the
latest edition of The National Electric Code, ANSI NFPA 70
and/or The Canadian Electric Code CSA C22.1.
WARNING
HIGH VOLTAGE!
To avoid personal injury or death due to
electrical shock, disconnect electrical power
before servicing or changing any electrical
wiring.
Humidifier
1.0 Amp maximum at 120 VAC
Electronic Air Cleaner
1.0 Amp maximum at 120 VAC
Use a separate fused branch electrical circuit containing
properly sized wire, and fuse or circuit breaker. The fuse
or circuit breaker must be sized in accordance with the
maximum overcurrent protection specified on the unit
rating plate. An electrical disconnect must be provided at
the furnace location.
Connect hot, neutral, and ground wires as shown in the
wiring diagram located on the unit’s blower door. Metal
conduit is not considered a substitute for an actual ground
wire to the unit. For direct vent applications, the cabinet
opening to the junction box must be sealed air tight using
either an UL approved bushing such as Heyco Liquid Tight
or by applying non-reactive UL approved sealant to bushing.
Line polarity must be observed when making field
connections. Line voltage connections can be made
through either the right or left side panel. The furnace
is shipped configured for a left side (right side for
counterflows) electrical connection with the junction box
located inside the burner compartment. To make electrical
connections through the opposite side of the furnace, the
junction box must be relocated to the other side of the
burner compartment prior to making electrical connections.
To relocate the junction box, follow the steps shown in the
Junction Box Relocation section.
WARNING
Edges of sheet metal holes may be sharp. Use gloves as a
precaution when removing hole plugs.
WARNING
To prevent personal injury or death due to electrical shock,
disconnect electrical power before installing or servicing
this unit.
WARNING
HIGH VOLTAGE!
To avoid the risk of injury, electrical shock
or death, the furnace must be electrically
grounded in accordance with the local codes
or in their absence, with the latest edition of
the National Electrical Code.
WARNING
To avoid the risk of injury, electrical shock or death, the
furnace must be electrically grounded in accordance with
the local codes, or in their absence, with the latest edition
of the National Electrical Code.
115 Volt Line Voltage Connection of Accessories
(Humidifier and Electronic Air Cleaner)
The furnace integrated control module is equipped with
line voltage accessory terminals for controlling power to
an optional field-supplied humidifier and/or electronic air
cleaner.
Turn OFF power to the furnace before installing any
accessories. Follow the humidifier or air cleaner
manufacturers’ instructions for locating, mounting,
grounding, and controlling these accessories. Accessory
wiring connections are to be made through the 1/4” quick
connect terminals provided on the furnace integrated
control module. The humidifier hot terminal is identified
as 120V HUM-H, its neutral terminal is identified as 120V
HUM-N. The electronic air cleaner hot terminal is identified
as EAC-H, its neutral terminal is identified as 120V
EAC-N. All field wiring must conform to applicable codes.
Connections should be made as shown. (See Figure 32)
If it is necessary for the installer to supply additional line
voltage wiring to the inside of the furnace, the wiring
must conform to all local codes, and have a minimum
temperature rating of 105°C. All line voltage wire splices
must be made inside the furnace junction box.
