34
440 01 4800 01
Specifications subject to change without notice.
The J--Box cover, mounting bracket and screws are shipped in the
loose parts bag included with the furnace. See Fig. 36 for J--Box
mounting locations.
The J--Box mounting bracket and green ground screw is used as a
grounding point for all line voltage wiring options. The J--Box
cover may be omitted when electrical connections are made inside
an external electrical box mounted external to the casing.
External Electrical Box on Furnace Casing
NOTE
: Check to ensure that external electrical box does not
interfere with duct work, gas piping or the indoor coil drain. See
Fig. 34 for alternate electric entry through top panel.
1. Select and remove 7/8--in. (22 mm) knock--out on the
desired side of the casing. Remove the knock--out from the
casing.
NOTE
: If electrical entry through the furnace top panel is used, a
7/8--in. (22 mm) hole must be drilled through the top panel.
2. Drill two (2) 1/8--in. (3 mm) pilot holes through the dimples
in the furnace casing near the 7/8--in. knock--out.
NOTE
: If electrical entry through the furnace top panel is used,
mark the screw hole locations using the mounting holes in the
external electrical box as a template.
For a side--mounted external electrical box, complete the
following:
1. Align the J--Box bracket with the knock--out inside the
furnace casing.
2. Install the threaded end of a strain--relief bushing through
the J--Box bracket and the furnace casing. Strain--relief
bushing should be installed so that the bushing can be
tightened around the wiring harness inside the furnace
casing.
3. Align the external electrical box with the 7/8--in. (22 mm)
knock--out.
4. Install and tighten the lock--nut on the strain--relief bushing
inside the external electrical box.
5. Fasten the external electrical box to the furnace casing using
two (2) sheet metal screws.
6. Route field power wiring into external electrical box.
7. Pull furnace line voltage power wires through strain--relief
bushing of the external electrical box.
8. Pull the ground wire of the field line voltage wiring through
the strain--relief bushing into the furnace casing.
9. Install the green ground screw to the J--Box bracket and
attach both ground wires to the green ground screw.
10. Connect any code required external disconnect(s) to field
power wiring.
11. Connect field power and neutral leads to furnace power
leads inside the external electrical box as shown in Fig. 32.
For a top panel--mounted external electrical box, complete the
following:
1. Drill two (2) 1/8--in. (3 mm) pilot holes through the dimples
in the furnace casing near the 7/8--in. knock--out on the side
of the casing. Do not remove the knock--out in the side of
the casing.
2. Align the J--Box bracket with the pilot holes inside the
furnace casing.
3. Install 2 screws through the outside of the casing to secure
the J--Box bracket to the furnace casing.
4. Route field power wiring into external electrical box.
5. Pull furnace line voltage power wires through strain--relief
bushing of the external electrical box.
6. Pull the ground wire of the field line voltage wiring through
the strain--relief bushing into the furnace casing.
7. Install the green ground screw to the J--Box bracket and
attach both ground wires to the green ground screw.
8. Connect any code required external disconnect(s) to field
power wiring.
9. Connect field power and neutral leads to furnace power
leads inside the external electrical box as shown in Fig. 34.
Power Cord Installation in Furnace J--Box
NOTE
:
Power cords must be able to handle the electrical
requirements listed in
Table
11. Refer to power cord
manufacturer’s listings.
1. Install J--Box mounting bracket to inside of furnace casing.
See
Fig.
36
.
2. Route listed power cord through 7/8--in. (22 mm) diameter
hole in casing and J--Box bracket.
3. Secure power cord to J--Box bracket with a strain relief
bushing or a connector approved for the type of cord used.
4. 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.
5. Connect field ground wire and factory ground wire to green
ground screw on J--Box mounting bracket as shown in
Fig.
36.
6. Connect power cord power and neutral leads to furnace
power leads as shown in
Fig.
38.
7. Attach furnace J--Box cover to mounting bracket with
screws supplied in loose parts bag. Do not pinch wires be-
tween cover and bracket. See
Fig.
36.
BX Cable Installation in Furnace J--Box
1. Install J--Box mounting bracket to inside of furnace casing.
See
Fig.
36.
2. Route BX connector through 7/8--in. (22 mm) diameter
hole in casing and J--Box bracket.
3. Secure BX cable to J--Box bracket with connectors ap-
proved for the type of cable used.
4. Connect field ground wire and factory ground wire to green
ground screw on J--Box mounting bracket as shown in
Fig.
36
.
5. Connect field power and neutral leads to furnace power
leads. as shown in
Fig.
38.
6. Attach furnace J--Box cover to mounting bracket with
screws supplied in loose parts bag. Do not pinch wires be-
tween cover and bracket.
FIRE, EXPLOSION, ELECTRICAL SHOCK, AND
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in dangerous
operation, personal injury, death, or property damage.
Do not drill into blower shelf of furnace to route control
wiring. Route any control or accessory wiring to the blower
compartment through external knockouts on the casing.
!
WARNING
24--V Wiring
Make field 24--v connections at the 24--v terminal strip. See
Fig.
39.
Connect terminal Y/Y2 as shown in Fig. 38 for proper cooling
operation. Use only AWG No. 18, color--coded, copper thermostat
wire.
NOTE
: Use AWG No. 18 color-coded copper thermostat wire for
lengths up to 100 ft. (30 M). For wire lengths over 100 ft., use
AWG No. 16 wire.
The 24--v circuit contains an automotive--type, 3--amp. fuse located
on the control. Any direct shorts during installation, service, or
