650.75-N4U
035-14370-000
14
Unitary Products Group
nector or other proper connection. Make wiring connections,
(Refer to Figure 11.) Replace the wiring box cover and
screws.
An alternate wiring method is to use a field provided 2 x 4 box
and cover on the outside of the furnace. Route the furnace
leads into the box using a protective bushing where the wires
pass through the furnace panel.
NOTE:The power connection leads and wiring box on upflow
units may be relocated to the left side of the furnace. Remove
the screws and cut wire tie holding excess wiring. Reposition
on the left side of the furnace and fasten using holes pro-
vided.
ELECTRICAL CONTROL CONNECTIONS
Install the field-supplied thermostat. The thermostat instruc-
tions for wiring are packed with the thermostat. With the ther-
mostat set in the OFF position and the main electrical source
disconnected, complete the low-voltage wiring from the ther-
mostat to the terminal board on the ignition module. Connect
Class 2 control wiring as shown in Figures 13 & 14. Electronic
thermostats may require a common connection as shown
dashed in Figure 14.
FIGURE 11 : UPFLOW MODELS (P*UR / FG9-UP /
G9T-UP) ELECTRICAL WIRING
CLASS 2 SYSTEM
CONTROL WIRING
TO THERMOSTAT
L1
(HOT)
N
GRD
BLK
GRN
WHI
WIRING INSIDE
JUNCTION BOX
: BLK/BLK
WHI/WHI
GRN/GRN
BURNER COMPARTMENT
BLOWER COMPARTMENT
DOOR SWITCH
IGNITION MODULE
TRANSFORMER
JUNCTION
BOX
C
R
Y
G
W
C OO
L
H EA
T
PARK
PARK
XFMR
LINE
H UM
EAC
XFMR
EAC
LINE
CIR
H UM
Y
FIGURE 12 : DOWNFLOW / HORIZONTAL MODELS
(P*DH / FG9-DH / G9T-DH) ELECTRI-
CAL WIRING
Set the heat anticipator in the room thermostat to
.45 amps. Setting it lower will cause short cycles.
Setting it higher will cause the room temperature to
exceed the setpoints
FIGURE 13 : POWER WIRING CONNECTIONS
FIGURE 14 : TYPICAL HEATING AND COOLING
CLASS 2 SYSTEM
CONTROL WIRING
TO THERMOSTAT
GRN
WIRING INSIDE
JUNCTION BOX
: BLK/BLK
WHI/WHI
GRN/GRN
BURNER COMPARTMENT
DOOR
SWITCH
IGNITION MODULE
FLUE CHASE
VENT PIPE
BLOWER COMPARTMENT
JUNCTION
BOX
L1
(HOT)
N
GRD
BLK
WHI
C
R
Y
G
W
COOL
HEAT
PARK
PARK
XFMR
LINE
HUM
EAC
XFMR
EAC
LINE
CIR
HUM
Y
TRANSFORMER
ROOM
THERMOSTAT
FURNACE
CONTROL
CONDENSING
UNIT
TO AIR CONDITIONER
CONTROLS
R
W
G
Y
C
R
W
G
Y
C
