-- 28 --
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.
Fig. 30 -- Heating and Cooling Application Wiring Diagram
A02174
115-V WIRING
Before proceeding with electrical connections, make certain that
voltage, frequency, and phase correspond to that specified on unit
rating plate. Also, check to be sure that service provided by
power supply is sufficient to handle load imposed by this
equipment. Refer to rating plate or Table 6 for equipment
electrical specifications.
The furnace must be electrically grounded in accordance with
local codes; or in the absence of local codes, with the National
Electric Code ANSI/NFPA 70 and/or the Canadian Electric Code,
CSA C22.1, Part I, if an external electrical source is utilized.
FIRE HAZARD
Failure to follow this warning could result in serious injury,
death, or property damage.
Do not connect aluminum wire between disconnect switch and
furnace. Use only copper wire. (See Fig. 31.)
!
WARNING
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
A93033
Fig. 31 -- Disconnect Switch and Furnace
Use a separate, fused branch electrical circuit containing a
properly sized fuse or circuit breaker for this furnace. See Table 6
for wire size and fuse specifications. A disconnecting means must
be located within sight from and readily accessible to furnace.
NOTE
: Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect or the furnace is not grounded, control center
LED status indicator light will flash rapidly and furnace will
NOT operate.
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in serious injury,
death, or property damage.
The cabinet MUST have an uninterrupted or unbroken ground
according to NEC ANSI/NFPA 70--2008 and Canadian
Electrical Code CSA C22.1 or local codes to minimize
personal injury if an electrical fault should occur. This may
consist of electrical wire or conduit approved for electrical
ground when installed in accordance with existing electrical
codes. Do not use gas piping as an electrical ground.
!
WARNING
J-Box Relocation
1. Remove 2 screws holding auxiliary J-box. (See Fig. 32.)
2. Rotate J-box 180
°
and attach box to left side, using
holes provided.
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in serious injury,
death, or property damage.
If manual disconnect switch is to be mounted on furnace,
select a location where a drill or fastener will not contact
electrical or gas components.
!
WARNING
24-V WIRING
Make field 24-v thermostat connections at 24-v terminal block on
furnace control center. For proper cooling operation, Y wire from
thermostat MUST be connected to Y terminal on furnace control
center, as shown in Fig. 30. The 24-v terminal block is marked
for easy connection of field wiring. (See Fig. 33.) The 24-v
circuit contains a 3-amp, automotive-type fuse located on furnace
control center. (See Fig. 34.) Any electrical shorts of 24-v wiring
during installation, service, or maintenance may cause fuse to
blow. If fuse replacement is required, use only a fuse of identical
size (3 amp) and type. The control will flash code 24 when fuse
needs replacement.
58MCB