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935SB: Installation, Start-up, Operating and Service Maintenance Instructions
utility is sufficient to handle load imposed by this equipment. Refer to
rating plate or 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.
WARNING
!
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
Fig.
Fig. 38 – Field-Supplied External Electrical Box on Furnace Casing
Use a separate, fused branch electrical circuit with a properly sized fuse
or circuit breaker for this furnace. For wire size and fuse specifications
(Table
13). A readily accessible means of electrical disconnect must be
located within sight of the furnace
J-Box Installation
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 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.
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.
The J-Box cover, mounting bracket and screws are shipped in the loose
parts bag included with the furnace. J-Box mounting locations (see
Fig.
39).
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.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
(Table
13).
38).
A190279
Fig. 39 – 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 (see
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.
Fig. 40 – Field-Supplied External Electrical Box on Furnace Casing
25
Fig.
36).
A190263
A190264
A190278
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