34
Figure 35. Wiring Diagram for Upflow and Downflow Models
For Upflow and Downflow Series Residential Furnaces
WD#7105460
If any of the original wire as supplied with the
furnace must be replaced, it must be replaced
with wiring material having a temperature rating
of at least 105° C.
Use copper conductors only.
Power On
Limit Circuit Open or External Load On "W"
Pressure Switch is Open with Inducer On
Pressure Switch is Closed with Inducer Off
Ignition Failure (Check Ground)
115 VAC & Neutral Reversed or no Ground
False Flame or Gas Valve Relay Shorted
ON
1 FLASH
2 FLASHES
3 FLASHES
4 FLASHES
5 FLASHES
Continuous
STATUS
RED
LIGHT
FAULT CONDITION
Power Off
Low Flame Sensor Signal
Flame Present
Continuous
Flash
OFF
ON
FLAME
YELLOW
LIGHT
FAULT CONDITION
ately after the limit switch opens. If the furnace
operates for more than four minutes with no
return air, set the thermostat to a temperature
below room temperature, shut off the power to
the furnace, and replace the limit switch.
DESCRIPTION OF COMPONENTS
Figure 36 shows the location of each of the
functional components described below. Also,
refer to the Sequence of Operation Section of
this manual. If any component of the furnace
Legend
Field Wiring
Factory Wiring:
Low Voltage
High Voltage
C
R
BLOWER DECK
LIMIT SWITCH
SUPPLY AIR
LIMIT SWITCH
FLAME ROLL-OUT
SWITCH
FLAME SENSOR
Hi
PRESSURE
SWITCH
BLOWER DOOR
SWITCH
TRANSFORMER
24 V
120 V
WHITE W/BLK STRIPES
BLK W/ WHITE STRIPES
WHITE
BLACK
IGNITOR
INDUCER
COM
24 V
3 AMP FUSE
BLOWER OFF
TWIN
FLAME
ST
A
TUS
1
1
2
2
1
2
1
2
Y
C
AIR CONDITIONER
CONDENSING UNIT
C
H
MH
ML
L
1
2
3
4
5
6
1
2
3
4
5
6
3 OR 4 SPEED
MOTOR
THESE WIRES ARE NOT
PRESENT ON ALL MODELS
2
4
5
6
N.O
N.C
24V
1
3
YELLOW
DPST
RELAY
VENT
SAFETY SWITCH
R
Y
G
W
W2
WHITE (NEUTRAL)
BLACK 120V
GROUND
SINGLE OR
TWO STAGE ROOM
THERMOSTAT
CLOSED END CONNECTOR
DO NOT REMOVE
ORANGE
ORANGE
WHITE
BLACK
GREEN
BROWN
YELLOW
NEUTRALS
RED
BLACK
BLACK
RED (Low Fire)
ORANGE
BLACK
RED
ORANGE
BLUE
BLACK
WHITE
WHITE
BLACK
BLACK
BLACK
BLACK
YELLOW
BROWN
BROWN
BROWN
HUM
M1
M2
M3
HEA
T
COOL
EA
C
XFMR
L1
EAC
HUM
6
3
5
2
1
4
6
3
9
8
5
2
7
1
4
R
C
Y
G
W
BLUE
BLUE
BLUE
BLUE
BLUE
YELLOW/BLACK
BLUE (High-Fire)
Lo
C
Gas Valve
Summary of Contents for TA-060C-08A
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