International comfort products A Series Installation Instructions Manual page 26

Fig. 38 - - Installing J- -Box (When Used)
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.
Alternate electric entry through top panel (Fig. 36).
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.
26
LINE VOLTAGE
A190263
Fig. 39 - - Field- -Supplied External Electrical Box on Furnace
A190264
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 (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.
Specifications subject to change without notice.
GROUND
NEUTRAL
ELECTRIC
DISCONNECT
SWITCH
COPPER
WIRE ONLY
ALUMINUM
WIRE
Casing
A11146
440 01 4601 01