IGNITOR
FLAME SENSOR
BLOWER
LIMIT
SWITCH
DOOR
SWITCH
BLOWER
MOTOR
BLOWER
LIMIT
SWITCH
GAS
VALVE
SUPPLY
AIR LIMIT
PRESSURE
SWITCH
24 V 120 V
WHITE
BLACK
WHITE W/ BLK STRIPES
BLK W/ WHITE STRIPES
1234
1234
1
2
1
2
T5
T1
N
G
L
C
T4
T3
T2
11
22
33
44
55
66
77
88
99
1010
1111
1212
11
22
33
44
MOTOR
PLUG
INDUCER
YELLOW
VIOLET
RED
BLACK
ROLL-OUT
LIMIT
1
2
3
4
5
6
1
2
3
4
5
6
7
8
9
RCYGW
LOW
ML
MH
HIGH
EAC
L1
XFMR
HUM
COM
GREEN
YELLOW
RED
3 AMP FUSE
24V
R
C
TX
RX
W
COM
L1A
NEUTRALS
1234
24V
24V
BLACK
WHITE
BLACK
WHITE
BLACK
GREEN
BLACK
BLACK
BLACK
RED
GREEN
YELLOW
YELLOW
ORANGE
BLUE
ORANGE
BLUE
BLUE
RED
GRAY
GRAY
BLACK
WHITE
BLACK
BLACK
WHITE
BLUE
RED
ORANGE
WHITE
GREEN
BLACK
GRAY
BLUE
RED
ORANGE
BLUE
BLUE
BLUE
BLUE
BLUE
BLACK
RED
WIRING DIAGRAM
1027409A
08/19
FIELD WIRING
LEGEND:
LOW VOLTAGE
HIGH VOLTAGE
SINGLE STAGE
THERMOSTAT
TO OUTDOOR
UNIT
WHITE (NEUTRAL)
BLACK 120V
GROUND
For 80% Ultra-Low NOx Series Single Stage Furnaces 120 Volt / 1 Ph. / 60 Hz.
Refer to the Installation Instructions
provided with the furnace for the
proper heating and cooling speeds
for your application.
If any of the original wire as
supplied with the furnace must
be replaced, it must be replaced
with wiring material having a
temperature of at least 105 C.
Use copper conductors only.
Diagnostic Description
Green
LED
Red
LED
Control Fault (No Power)
Off Off
L1 / Neutral Polarity Fault
Flash Flash
1 Hour Lockout
Normal Operation
On On
Pressure Switch Closed Fault
On Flash
Pressure Switch Open Fault
Flash On
Open Limit Switch Fault
Flash Off
Diagnostic Description
Low Flame Sensor Signal
Flame Present
FAULT CONDITIONS
Yellow LED
Continuous Flash
On
Alternating Flash
OBSOLETE
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