International comfort products C Series Installation Instructions Manual page 34

INSTALLATION INSTRUCTIONS
The J--Box cover, mounting bracket and screws are shipped in
the loose parts bag included with the furnace. See Figure 40
for J--Box mounting locations.
Figure 40 Optional J- -Box Locations
Representative drawing only, some models may vary in appearance.
Figure 41 J- -Box Bracket Installation
J--BOX
MOUNTING
SCREWS
BLUNT--TIP
J--BOX
MOUNTING
BRACKET
GROUND
SCREW
J--BOX COVER
The J--Box mounting bracket and green ground screw are 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 ductwork, gas piping or the indoor coil drain. See
Figure 38 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.
34
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:
3. Align the J--Box bracket with the knock--out inside the
OPTIONAL
furnace casing.
J- -BOX
LOCATIONS
4. 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.
5. Align the field--supplied external electrical box with the
7/8--in. (22 mm) knock--out.
6. Install and tighten the lock--nut on the strain--relief
bushing inside the external electrical box.
7. Fasten the external electrical box to the furnace casing
using two (2) sheet metal screws.
8. Route field power wiring into external electrical box.
9. Pull furnace line voltage power wires through strain--relief
bushing of the external electrical box.
10. Pull the ground wire of the field line voltage wiring
through the strain--relief bushing into the furnace casing.
L12F024
11. Install the green ground screw to the J--Box bracket and
attach both ground wires to the green ground screw.
12. Connect any code required external disconnect(s) to field
power wiring.
13. Connect field power and neutral leads to furnace power
leads inside the external electrical box as shown in
Figure 41.
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 two (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.
A170137
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
Figure 42.
Specifications subject to change without notice.
Gas Furnace: N9MSB
440 01 4104 07