L.B. White AD250(Spark Ignition) - Manual (Page 26)

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.
25
Electrical Connection and Ladder Diagram
WARNING: THIS HEATER MAY START AT ANY TIME
GROUND
POWER CORD
AIR PROVING
SWITCH
FAN
MOTOR
OPTIONAL
THERMOSTAT
IGNITER
FLAME SENSOR
GAS CONTROL VALVE
HIGH LIMIT
SWITCH(ES)
TRANSFORMER
GREEN
WHITE BLACK YELLO
W
BROWN
BLUE
BLUE
WHITE
BROWN
BR
O
W
N
GREEN
BLA
CK
WHITE
WHITE
BLACK
WHITE
BLACK
GREEN
BLUE
BLUE
BLACK
BLACK
GREEN
GREEN
YELLOW
BROWN
WHITE
LI
IND
L.E.D.
MV
PS2
PS1
W
FS
C
COM
DSI CONTR
OL
GROUND
HIGH VOLTAGE
IGNITION LEAD
HEAT CHAMBER
OR
BURNER GROUND
ELECTRICAL CONNECTION DIAGRAM
ELECTRICAL LADDER DIAGRAM
120 V 24 V
NEUTRAL
HIGH LIMIT
SWITCH(ES)
SOLENOID(S)
FLAME SENSOR
TRANSFORMER
AIR PROVING SWITCH
IGNITER
DSI CONTR
OL
THERMOSTAT
GROUND
GROUND
IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE HEATER MUST BE REPLACED, IT MUST
BE REPLACED WITH WIRING MATERIAL HAVING A TEMPERATURE RATING OF AT LEAST 302 F (150 C)
LI
IND
L.E.D.
MV
PS2
PS1
W
FS
C
COM
LI
MOTOR