Canadian Electrical Code CSA C22.1 or authorities having juris-
diction. Use a separate, fused branch electrical circuit containing a
properly sized fuse or circuit breaker for this furnace. See Table 4
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, control center LED status indicator light will
flash rapidly and furnace will NOT operate.
CAUTION:
Do not connect aluminum wire between
disconnect switch and furnace. Use only copper wire.
Failure to follow this caution will result in intermittent
unit operation or performance satisfaction. (See Fig. 28.)
WARNING:
The cabinet MUST have an uninterrupted
or unbroken ground according to NEC ANSI/NFPA
70-2002 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. Failure to follow this
warning could result in electrical shock, fire, or death.
J-BOX RELOCATION
1. Remove 2 screws holding auxiliary J-box. (See Fig. 29.)
2. Rotate J-box 180° and attach box to left side, using holes
provided.
CAUTION:
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.
Failure to follow this caution will result in intermittent
unit operation or performance satisfaction.
B.
24–v Wiring
Make field 24-v thermostat connections at 24-v terminal block on
furnace control. For proper cooling operation, Y wire from
thermostat MUST be connected to Y/Y2 terminal on furnace
control center, as shown in Fig. 27. The 24-v terminal block is
marked for easy connection of field wiring. (See Fig. 30.) The 24-v
circuit contains a 3-amp, automotive-type fuse located on furnace
control. (See Fig. 31.) 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.
NOTE:
Use AWG No. 18 color-coded copper thermostat wire
for lengths up to 100 ft. For wire lengths over 100 ft, use AWG No.
16 wire.
C.
Accessories
1. Electronic Air Cleaner (EAC)
Two quick-connect terminals marked EAC-1 and EAC-2
are provided for EAC connection. (See Fig. 31.) These
terminals are energized with 115-v (1.0-amp maximum)
during blower motor operation.
WARNING:
DO NOT connect furnace control HUM
terminal to HUM (humidifier) terminal on Thermidis-
tat™, Zone Controller or similar device. See Thermidis-
tat™, Zone Controller, thermostat, or controller manufac-
turer’s instructions for proper connection. A failure to
follow this warning could result in fire.
2. Humidifier (HUM)
A quick-connect terminal (HUM) and screw terminal (C
OM
24V) are provided for 24-v humidifier connection. (See Fig.
30.) HUM terminal is energized with 24-v (0.5-amp maxi-
mum) when gas valve is energized.
Fig. 27—Typical Heating and Cooling Application Wiring Diagram
A99440
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/Y2
GND
THERMOSTAT
TERMINALS
1.
2.
3.
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Summary of Contents for CONDENSING GAS FURNACE 350MAV
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