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INSTALLATION INSTRUCTIONS
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.
SWITCH
COPPER
WIRE ONLY
ALUMINUM
WIRE
Figure 39
Heating and Cooling Application Single Stage Wiring Diagram
FIVE WIRE
THREE-WIRE
HEATING-ONLY
BLOWER DOOR SWITCH
BLK
BLK
WHT
WHT
GND
AUXILIARY
115-V FIELD-
J-BOX
SUPPLIED
DISCONNECT
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 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.
440 01 4104 07
A11146
NOTE 2
W
C
R
W
C
R
O
N
T
GND
R
G
O
COM
L
NOTE 1
Y
24-V
TERMINAL
BLOCK
NOTES:
FURNACE
Specifications subject to change without notice.
Use a separate, fused branch electrical circuit with a properly
sized fuse or circuit breaker for this furnace. See Table 11 for
wire size and fuse specifications. A readily accessible means of
electrical disconnect must be located within sight of the
furnace.
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
THERMOSTAT
G
Y
TERMINALS
CONDENSING
UNIT
TWO
WIRE
1.
Connect Y-terminal in furnace as shown for proper blower operation.
2.
Some thermostats require a "C" terminal connection as shown.
3.
If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
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 an external
electrical box is attached to the outside of the furnace casing.
The field wiring and main wiring harness are grounded with the
furnace box is grounded to the green ground screw of the
J--Box bracket and the earth ground of the field electrical
supply. 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.
Gas Furnace: N9MSB
FIELD-SUPPLIED
DISCONNECT
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
GND
A11387
33
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