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CAUTION
Always refer to the heater’s electrical connection diagram when servicing to avoid wiring errors and heater malfunction.
Check for proper operation after servicing.
27
Electrical Connection and Ladder Diagram
WARNING: THIS HEATER MAY START AT ANY TIME
HIGH LIMIT
SWITCH
GAS CONTROL
VALVE
ELECTRICAL LADDER DIAGRAM
IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE MUST BE REPLACED, IT MUST BE
REPLACED WITH WIRING MATERIAL HAVING A TEMPERATURE RATING OF AT LEAST 302o F. (150o C.)
HIGH LIMIT
SWITCH
ELECTRICAL CONNECTION DIAGRAM
BURNER
GROUND
GROUND
GROUND
THERMOSTAT
SELECTOR SWITCH
MOTOR
TRANSFORMER
BROWN
BROWN
BROWN
BROWN
BROWN
BLUE
BROWN
BLUE
BLUE
BLUE
BLUE
WHITE
GREEN/
YELLOW
GREEN/
YELLOW
YELLOW
THERMOSTAT
GROUND
BROWN
BROWN
BROWN
BROWN
BROWN
BLUE
BLUE
BLUE
BLUE
BLUE
GREEN/YELLOW
BLUE
BLUE
BLUE
WHITE
WHITE
WHITE
WHITE
HEAT
OFF
VENT
(N)
(N)
(N)
POWER
CORD
TERMINAL STRIP
CIRCUIT BREAKER
BLUE
BROWN
BROWN
BROWN
BLUE
BLUE
WHITE
WHITE
GRAY
GRAY
GRAY
RED
RELAY
WHITE
GRAY
RED
ORANGE
ORANGE
YELLOW
GREEN/YELLOW
AIR PROVING
SWITCH
L.E.D. INDICATOR
MANUAL RESET
BUTTON (WHITE)
DIRECT SENSE IGNITER
DSI CONTR
OL
1 NC
2 KEY
3 NC
4 24 VAC RTN
5 NC
6 GND
7 NC
8 IND
9 GM
10 PSW
11 NC
12 L
13 NC
GROUND
GROUND
NEUTRAL
SELECTOR SWITCH
MOTOR
L1
GROUND
BURNER GROUND
CIRCUIT BREAKER
HIGH LIMIT
SWITCH
HIGH LIMIT
SWITCH
AIR PROVING SWITCH
RELAY
TRANSFORMER
240V
24V
SOL
SOL
HEAT
OFF
VENT
IGNITER SENSOR
MANUAL RESET
BUTTON (WHITE)
L.E.D. INDICATOR
DSI CONTR
OL
1 NC
2 KEY
3 NC
4 24 VAC RTN
5 NC
6 GND
7 NC
8 IND
9 GM
10 PSW
11 NC
12 L
13 NC