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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.
28
Electrical Connection and Ladder Diagram
WARNING: THIS HEATER MAY START AT ANY TIME
ELECTRICAL CONNECTION DIAGRAM
ELECTRICAL LADDER DIAGRAM
TRANSFORMER
GROUND
GAS CONTROL
VALVE
FUSE
HIGH LIMIT
SWITCH(ES)
THERMOSTAT
(OPTIONAL)
GROUND
JUMPER
(REMOVE TO ADD
THERMOSTAT)
AIR PROVING SWITCH
YELLOW
CABINET, CONTROL VALVE, MOTOR,
& THERMOSTAT GROUND
POWER
CORD
CABINET, CONTROL VALVE,
MOTOR, & THERMOSTAT GROUND
NEUTRAL
L 1
THERMOSTAT
AIR PROVING SWITCH
HIGH LIMIT
SWITCH(ES)
FUSE
TRANSFORMER
MOTOR
24V
240V
IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE
MUST BE REPLACED, IT MUST BE REPLACED WITH WIRING HAVING
A TEMPERATURE RATING OF AT LEAST 302º F (150º C).
BROWN
BLUE
BLUE
BROWN
GREEN/YELLOW
BROWN
BLUE
GROUND
GREEN/
YELLOW
YELLOW
GREEN/
YELLOW
GREEN/
MOTOR
GREEN
YELLO
W
YELLO
W
YELLO
W
YELLO
W
BLUE
BR
O
W
N
BR
O
W
N
BLUE
GAS CONTROL
VALVE