INSTALLATION INSTRUCTIONS
Gas Furnace: N9MSE
440 01 4103 03
31
Specifications subject to change without notice.
115
−
V Wiring
Furnace must have a 115-v power supply properly connected
and grounded.
NOTE
: Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect, control status indicator light flashes rapidly
and furnace does
NOT
operate.
Verify that the voltage, frequency, and phase correspond to that
specified on unit rating plate. Also, check to be sure that
service provided by utility is sufficient to handle load imposed
by this equipment. Refer to rating plate or
Table 11
for
equipment electrical specifications.
U.S.A. Installations:
Make all electrical connections in
accordance with the current edition of the National Electrical
Code (NEC) ANSI/NFPA 70 and any local codes or ordinances
that might apply.
Canadian Installations:
Make all electrical connections in
accordance with the current edition of the Canadian Electrical
Code CSA C22.1 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.
COPPER
WIRE ONLY
SWITCH
ALUMINUM
WIRE
A11146
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.
Figure 35
Heating and Cooling Application Single Stage Wiring Diagram
A11387
115-V FIELD-
SUPPLIED
DISCONNECT
AUXILIARY
J-BOX
24-V
TERMINAL
BLOCK
THREE-WIRE
HEATING-ONLY
FIVE WIRE
NOTE 1
NOTE 2
FIELD-SUPPLIED
DISCONNECT
CONDENSING
UNIT
TWO
WIRE
FURNACE
C
O
N
T
R
O
L
R
G
COM
W
C
R
G
Y
GND
GND
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
BLOWER DOOR SWITCH
WHT
BLK
WHT
BLK
NOTES:
Connect Y-terminal in furnace as shown for proper blower operation.
Some thermostats require a "C" terminal connection as shown.
If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
W
Y
GND
THERMOSTAT
TERMINALS
1.
2.
3.
J
−
Box Installation
!
WARNING
FIRE OR ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury, death, or property damage.
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 is used when field line voltage electrical connections
are made to the furnace wiring harness inside the furnace
casing. The J-Box is not required if a field-supplied electrical
box is attached to the outside of the furnace casing and the box
is grounded to the green ground wire of the main wiring
harness and the earth ground of the field electrical supply.
The J
−
Box cover, mounting bracket and screws are shipped in
the loose parts bag included with the furnace. The J
−
Box can
be mounted on the left or right side of the casing, as viewed
from the upflow position. (See
Figure 36
)
