INSTALLATION INSTRUCTIONS Gas Furnace: WFAR
32 440 01 7104 02
Specifications subject to change without notice.
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in personal
injury, death, or property damage.
The cabinet MUST have an uninterrupted or
unbroken ground according to NEC NFPA 70--2011
or local codes to minimize personal injury if an
electrical fault should occur. In Canada, refer to
Canadian Electrical Code CSA C22.1. This may
consist of electrical wire, conduit approved for
electrical ground or a listed, grounded power cord
(where permitted by local code) when installed in
accordance with existing electrical codes. Refer to
the power cord manufacturer’s ratings for proper
wire gauge. Do not use gas piping as an electrical
ground.
!
WARNING
FURNACE MAY NOT OPERATE HAZARD
Failure to follow this caution may result in intermittent
furnace operation.
Furnace control must be grounded for proper
operation or else control will lock out. Control must
remain grounded through green/yellow wire routed to
gas valve and manifold bracket screw.
CAUTION
!
115--V Wiring
Furnace must have a 115-v power supply properly connected
and grounded.
NOTE: Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect, control LED status indicator light will flash
rapidly and furnace will NOT operate.
Verify that the voltage, frequency, and phase correspond to that
specified on unit rating plate. Also, check to be sure that
service provided by utility is sufficient to handle load imposed
by this equipment. Refer to rating plate or Table 10 for
equipment electrical specifications.
U.S.A. Installations: Make all electrical connections in
accordance with the current edition of the National Electrical
Code (NEC) NFPA 70 and any local codes or ordinances that
might apply.
Canada Installations: Make all electrical connections in
accordance with the current edition of the Canadian Electrical
Code CSA C22.1 and any local codes or ordinances that might
apply.
FIRE HAZARD
Failure to follow this warning could result in
personal injury, death, or property damage.
Do not connect aluminum wire between
disconnect switch and furnace. Use only copper
wire. See Figure 35.
!
WARNING
Use a separate, fused branch electrical circuit with a properly
sized fuse or circuit breaker for this furnace. See Table 10 for
wire size and fuse specifications. A readily accessible means of
electrical disconnect must be located within sight of the
furnace.
J--Box Installation
FIRE OR ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury, death, or property damage.
If field--supplied manual disconnect switch is to be
mounted on furnace casing side, select a location
where a drill or fastener cannot damage electrical or
gas components.
!
WARNING
The J-Box is used when field line voltage electrical connections
are made to the furnace wiring harness inside the furnace
casing. The J-Box is not required if a field-supplied electrical
box is attached to the outside of the furnace casing and the box
is grounded to the green ground wire of the main wiring
harness and the earth ground of the field electrical supply.
The J--Box cover, mounting bracket and screws are shipped in
the loose parts bag included with the furnace. The J--Box can
be mounted on the left or right side of the casing, as viewed
from the upflow position. (See Figure 34)
Remove the J--Box cover and mounting bracket from the loose
parts bag. Select a 7/8--in. (22 mm) knock-out on the desired
side of the casing. Remove the knock-out from the casing. Drill
two (2) 1/8--in. (3 mm) pilot holes in the casing dimples by the
desired 7/8--in. (22 mm) knock-out.
Align the J--Box mounting bracket against the inside of the
casing and secure the mounting bracket with the screws. (See
Figure 34.)
Electrical Box on Furnace Casing Side
NOTE: Check that duct on side of furnace will not interfere with
installed electrical box.
1. Fasten a field-supplied external electrical box to the
outside of the casing by driving two field-supplied screws
from inside electrical box into casing. (See Figure 35.)
2. Route field power wiring into external electrical box.
3. Pull furnace power wires through 1/2-in. (12 mm)
diameter hole in J-Box. If necessary, loosen power wires
from strain--relief wire-tie on furnace wiring harness.
4. Connect any code required external disconnect(s) to field
power wiring.
5. Route external field power wires through holes in
electrical box and casing.
6. Connect field ground wire and factory ground wire to
green ground screw on J--Box mounting bracket as
shown in Figure 34.
7. Connect field power and neutral leads to furnace power
leads as shown in Figure 37.
8. Attach furnace J-Box cover to mounting bracket with
screws supplied in loose parts bag. Do not pinch wires
between cover and bracket.
9. Complete external disconnect wiring and installation.
Connect line voltage leads as shown in Figure 35. Use
best practices (NEC) NFPA 70 in U.S.A. for wire
bushings, strain relief, etc., CANADA: Canadian
Electrical Code CSA C22.1)
Power Cord Installation in Furnace J--Box
NOTE: Power cords must be able to handle the electrical
requirements listed in Table 10. Refer to power cord
manufacturer’s listings.
1. Install J--Box mounting bracket to inside of furnace
casing. (See Figure 34.)
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