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XI. Electrical Connections
WARNING
To avoid the risk of electrical shock, wiring
to the unit must be properly polarized and
grounded.
WARNING
To avoid electrical shock, injury or death,
disconnect electrical power before
servicing or changing any electrical wiring.
CAUTION
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify
proper operation after servicing.
WIRING HARNESS
The wiring harness is an integral part of this furnace. Field
alteration to comply with electrical codes should not be
required. Wires are color and number coded for identifica-
tion 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 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 N.E.C. 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.
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 maxi-
mum overcurrent protection specified on the unit rating
plate. An electrical disconnect must be provided at the
furnace location.
NOTE: Line polarity must be observed when making field
connections.
WARNING
In upright upflow installations, the drain
trap must be mounted on the opposite side
of the unit from the junction box. This will
reduce the risk of water reaching the
junction box in the event of a blocked drain
condition.
Connect hot, neutral, and ground wires as shown in the
wiring diagram located on the unit's blower door. For direct
vent applications, the cabinet opening to the junction box
must be sealed using the "liquid-tight" fitting provided.
Refer to the following figure.
Field-installed Wiring
Line polarity must be observed when making field connec-
tions. Line voltage connections can be made through either
the right or left side panel. The furnace is shipped config-
ured for a left side (right side for counterflows) electrical
connection with the junction box located inside the blower
compartment. To make electrical connections through the
opposite side of the furnace, the junction box must be
relocated to the other side of the blower compartment prior
to making electrical connections. To relocate the junction
box, follow the steps shown below.
NOTE: Wire routing must not to interfere with circulator
blower operation, filter removal, or routine maintenance.
CAUTION
Edges of sheet metal holes may be sharp.
Use gloves as a precaution when removing
hole plugs.
1. Remove the burner compartment door.
2. Remove and save the two screws securing the junction
box to the side panel.
3. Relocate junction box and associated plugs and grom-
mets to opposite side panel. Secure with screws
removed in step 2.
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