Wiring Diagram - A.O. Smith 240 T-H3J Service Manual

6. Wiring diagram

240 (T-H3J) models / 340 (T-H3S) models
W: WHITE BK: BLACK
R: RED BL: BLUE
G: GREEN O: ORANGE
IG
Igniter rod
SV3
R
SV2
G
SV1
LB
MV
BL
BL BL
C2
BL
BL
O.H.C.F
Hi-
C1
limit BL
BL
Switch
Hi-limit switch
W
for exhaust
Exhaust
W
thermistor
240/340 Direct Vent
Indoor Only
Gas
Propor-
W
R
Valve
Green LED
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
LB: LIGHT BLUE
Y: YELLOW
BR: BROWN P: PURPLE
Heater
Heater
Heater
P
P
B
PCB
73
53
C
9
3
K2
W
W
K1
W
W
H1
E1
E2
W
1 2 3 4 5 6 7 8 9 10
OFF
Bank of DIPswitches
14
Page
240/340 Outdoor 240/340 Direct Vent Indoor
Y
Heater
Heater
Y
B1
W
A
BK
G SW
Ground
W
G
Y BL O
FM
R
AFR rod
I
Y
G
O
Flame rod
Flow
H2 R
W
Sensor
BK
J
BK
R
240/340 Direct Vent Indoor Only
L
BK
BL R
Temperature controller
W
Outlet thermistor
BK
BK Inlet thermistor
BK
F
Temperature remote controller
CONFIDENTIAL
Ver. 1.00
Heater
Y
Y
B1
Y
Heater
Y
BK
Thermostat
W
BK
W
Surge
BK
box
W
A1
BK
A2
120 VAC
G
Ground
Ground
Flow
Adjust-
ment
Valve