A.O. Smith 240 T-H3J Service Manual page 16

7. Wiring diagram check points for diagnosis
Check-
Part and Description
point
A 120V Power supply
A1, A2 120V Power supply
B
B1 Heater
C Gas valves
C1 Hi-limit switch
C2
D1, D2
540 (T-H3) models only
E1 Outlet thermistor
E2
E3
540 (T-H3) models only
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Color of wires
White – Black
Black - White
Purple - Purple
Yellow - Yellow
Green - blue at COM (SV1)
Orange - blue at COM (SV2)
Red - blue at COM (SV3)
Blue - Blue
Blue - Blue
Black - White
Black - Black
Black - Black
Black - Black
16
Page
CONFIDENTIAL
Ver. 1.00
Normal range
108 to 132 VAC
108 to 132 VAC
108 to 132 VAC
108 to 132 VAC
93 to 120 VDC (during
93 to 120 VDC (during
93 to 120 VDC (during
93 to 120 VDC (during
and
and
15 VDC
See table on p. 18
See table on p. 19