PG92MSA: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
26
J-Box Installation
The J-Box must be used when field line voltage electrical connections
are made to the furnace wiring harness inside the furnace casing. The
J-Box cover is not required if a field-supplied external electrical box is
attached to the outside of the furnace casing. The field ground wire and
furnace main ground wire are grounded when the J-Box bracket is
attached to the furnace and the field ground wire and factory ground wire
are secured to the bracket grounding screw. If the J-Box cover is not
used, the field and factory spliced connections must be located inside the
external electrical box. Do not leave splice connections unprotected
inside the furnace.
A12226
Fig. 35 – Installing J-Box (When Used)
The J-Box cover, mounting bracket and screws are shipped in the loose
parts bag included with the furnace. See Fig. 35 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. 31 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.
A190278
Fig. 36 – Field-Supplied External Electrical Box on Furnace Casing
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.
WARNING
!
FIRE OR ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury, death, or
property damage.
High voltage field connections must be located in J-Box with furnace,
or in field supplied external disconnect mounted to furnace.
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.
To Next Page
Loading...
