Operating instructions

1616
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.
WARNING
To avoid the risk of electrical shock, injury, or death, the furnace must be electrically grounded in accordance with
local codes or, in their absence, with the latest edition of The National Electric Code.
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
maximum 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.
Junction Box Relocation
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
configured for a right side electrical connection with the
junction box located on the left side of the furnace. To
make electrical connections through the opposite side of
the furnace, the junction box must be relocated to the other
side prior to making electrical connections. To relocate the
junction box, perform the steps that follow.
CAUTION
Edges of sheet metal holes may be sharp. Use
gloves as a precaution when removing hole plugs.
1. Remove both doors from the furnace.
2. Remove and save the screws holding the junction
box to the right side of the furnace.
3. Disconnect the hose from the pressure switch.
Leave the other end attached to the induced draft
blower.
4. Remove four wires to the pressure switch assembly.
5. Swap locations of the two bushings in the junction
box.