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Servicing should only be performed by a Qualied Service Agent
WIRING DIAGRAM – SUF 400, 500
1
2
5
6
WHITE
GREEN
BLACK
BLACK
WHITE
RED
COMBUSTION
BLOWER
NOTE: COMBUSTION BLOWER MOTORS
ON 400,000 & 500,000 Btu/hr MODELS ARE
THREE PHASE (3Ø) MOTORS.
BLACK, WHITE AND RED WIRES MUST BE
WIRED AS SHOWN OR THE MOTOR WILL
TURN BACKWARDS. THIS MAY CAUSE THE
CONTROL SYSTEM TO LOCK OUT ON
“BLOWER PROVER OPEN” FAULT.
WHITE/BLACK
WHITE/GREEN
WHITE
WHITE/YELLOW
1T 2T 3T
L
N
AI1
0V
+15V
L l1
2
GREEN
WHITE
RED
BLACK
1
BLACK
3
WHITE
1 RED (ECO)
4 RED (ECO)
2 BLACK
3 BLACK
BLOCKED
INTAKE AIR
BLOCKED
EXHAUST
BLOWER
PROVER
24 VAC
GAS VALVE
BCC
6J5J4J7J51J
61J
01J31J2J3J1J
TRANSFORMER
50VA
GROUND STRIP
BURNER GROUND
(BURNER BOLT)
LOW GAS
PRESSURE SWITCH
1 BLACK
RED
2 WHITE
1 BLACK
2 BLACK
MIU
1
2
15
4
14
5
10
6
7
8
13
11
L
N
ANODE 1
ANODE 2
1 GREEN
2 BLUE
NOITCNUJ
XOB
RED
GREEN
GREEN
WHITE
NEERG
NEERG
NEERG
GREEN
UPPER TEMPERATURE PROBE
1 BLACK120 VAC HOT
3 WHITE 120 VAC NEUTRAL
4 YEL 24 VAC
4 YEL 24 VAC
LOWER TEMPERATURE PROBE
HOT SURFACE IGNITER
FLAME SENSOR
(CENTRAL CONTROL BOARD)
INSIDE CCB
ENCLOSURE
GROUND
120 VAC NEUTRAL
120 VAC HOT
USER INTERFACE MODULE
ENABLE/DISABLE CIRCUIT
JUMPER WIRE BETWEEN PINS
8 AND 11 ON J6 PLUG
VFD
VARIABLE
FREQUENCY
DRIVE
ON/OFF
SWITCH