Operating instructions

CAUTION: FURNACE MAY NOT OPERATE
Failure to follow this caution may result in furnace
operation stopping and water pipes freezing during cold
weather.
Furnace control must be grounded for proper operation or
control will lock out. Control is grounded through
green/yellow wire routed to gas valve and burner box
screw.
A. 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 4 for equipment electrical specifi-
cations.
Make all electrical connections in accordance with National
Electrical Code (NEC) ANSI/NFPA 70-2002 and any local codes
or ordinances that might apply. For Canadian installations, all
electrical connections must be made in accordance with Canadian
Electrical Code CSA C22.1 or authorities having jurisdiction.
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.
WARNING: 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. 28.)
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.
WARNING: 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 70-2002 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 accor-
dance with existing electrical codes. Do not use gas
piping as an electrical ground.
J-BOX RELOCATION
1. Remove 2 screws holding auxiliary J-box. (See Fig. 29.)
2. Rotate J-box 180° and attach box to right side, using holes
provided.
WARNING: 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.
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 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 instal-
Fig. 27—Typical Heating and Cooling Application Wiring Diagram
A02174
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
WCR GY
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.
—20—
→
→