Single Stage Multi Position Furnace
Service
Manual
50
440 08 2001 02
Wiring Diagram (90+ Single Stage Furnaces)(A1)
Y
G
THERMOSTAT
23
4
MAIN LIMIT
GAS
VALVE
N
N
G
N
Y
1
5
INDUCER
MOTOR
EAC
115V
ROLLOUT SWITCH
1 TO 3 IN SERIES
DEPENDING ON MODEL
3
6
4
2
TRANSFORMER
L1
HUM
L1
12
FAN CONTROL MODULE
W
Y
G
G
W
Y
W
TRANSFORMER
BLOWER
MOTOR
L1
L1
L1
C1
NEUTRAL
BL
BK
INDUCER
MOTOR
R
FURNACE
CONTROL
BK
W
ROLLOUT SWITCH
1 TO 3 IN SERIES
DEPENDING ON
MODEL
W
BL
W
BK
O
R
4
L1
CONT
COOL
1
2
EAC
3
HEAT
4
C2
4
56
24V SECONDARY
23
DATA
5A FUSE
24V
24VAC
O
BK
R
ON
115V
60HZ
HEAT ON DELAY: 30 SEC.
1012910-C
DISCONNECT BEFORE SERVICING
DANGER: ELECTRICAL SHOCK HAZARD
CONNECTION DIAGRAM
COOL ON DELAY: 5 SEC
COOL OFF DELAY: 60 SEC
S1
HEAT OFF DELAY
BL
GAS VALVE
R
W
BL
P
W
BK
GND
COPPER
CONDUCTORS
ONLY
6
NEUTRAL
HOT
W
5
4
3
2
8
1
7
3
C3
COM
W
24
VAC
C
Y
R
C
BL
R
W
Y
FURNACE CONTROL
G
BR
BR
CAPACITOR
Y
R
R
1
2
3
4
3
7
2
1
6
5
4
8
1
EAC
HUM
N
2
4
87
12
3
4
4
SEE MANUALS FOR ADJUSTING SPEED TAPS FOR PROPER HEATING, COOLING & CIRCULATING SPEEDS.
COLOR CODE
6
3
5
BLACK BK
BLUE BL
BROWN BR
GREEN G
ORANGE O
RED R
WHITE W
YELLOW Y
PURPLE P
1
SPEED TAP CODE
BLACK-HI BLUE-MLO
ORANGE-MHI RED-LO
*
LINE VOLTAGE FACTORY
LINE VOLTAGE FIELD
LOW VOLTAGE FACTORY
LOW VOLTAGE FIELD
INTERNAL CIRCUIT BOARD WIRING
5 A
FUSE
FACTORY
SETTING
1
2
N
N
BLOWER
MOTOR
LO (R)
M2
M1 MLO (BL)
GND.
HEAT MHI (O)
COOL HI (BK)
LADDER DIAGRAM
INTERLOCK
SWITCH
HOT 115V-60HZ NEUTRAL
IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE
MUST BE REPLACED, IT MUST BE REPLACED WITH TYPE
AWM - 105°C WIRE OR ITS EQUIVALENT.
GAS
VALVE
LP PRESSURE
SWITCH
(LP MODELS ONLY)
ON
INTERLOCK
SWITCH
1
MAIN LIMIT
FIELD
CONNECTION
BOX
LP PRESSURE
SWITCH
(LP MODELS ONLY)
1 2
HUM
M2
M1
115V PRIMARY
R
1
2
3
THERMOSTAT
4
12
12
60 SEC.
140 SEC. 180 SEC.
12
100 SEC.
12
1
L1
L1
COM
BL
L1
SENSOR
IGNITOR
BL
PRESSURE SWITCH
1 TO 2 IN SERIES
DEPENDING ON
MODEL
PRESSURE SWITCH
1 TO 2 IN SERIES
DEPENDING ON MODEL
BR
BR
CAPACITOR
(SOME MODELS)
CAPACITOR
(SOME MODELS)
IGNITER
SENSOR
RECTIFIED AC VOLTAGE
NOTE:
MOST VOLT METERS WILL READ 13-16 VOLTS TO
CHASSIS ON BOTH SIDES OF AN OPEN LIMIT OR
PRESSURE SWITCH IN THE RECTIFIED AC
VOLTAGE CIRCUIT
BK
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