Wiring Diagram - A.O. Smith T-M50 ASME Service Manual

6. Wiring diagram

Left side unit
Water
G
Y
O
Control
R
BL
BK
valve
W
G
Y
R
Burning lamp
Mixing
thermistor
E1
B K
Inlet
thermistor
E3
B K
Output
B K
thermistor
B K
E2
B K
B K
B K
SV3
R
C
O
SV2
G
L B
B L
SV1
A
MV
B L B L C2
B L B L P
O.H.C.F
P
Hi-
B L
limit
B L
C1
G G
Ground
Ground
Alarm
Draft switch
contact
Priority SW
Button to check
unit number
Error call
button
Pump test run
7 Seg LED
BK:BLACK
P:PURPLE
Gas
Porpor- Flow
tional
Sensor
Valve
BL
BK
W
W
WR
B K R
J
B K R
WR
W
H1
Dipswitches
W
MAX button
MIN button
Increase button
Decrease button
Y
Y
Air-fuel
ratio rod
G
Ground
O
I
Flame
rod
G
O
Y
B L
R
F M
P
B
Igniter
P
rod
I G
B K
A A
Pump
port
N
FM
port
Upper bank of
dipswitches
Communication
lamp (right)
1 2 3 4 5 6 7 8
Communication
O F F
lamp (left)
Multi-system
1 2 3 4 5 6 7 8
on line lamp
O F F
Lower bank of
dipswitches
T-M50 / T-M50 ASME Service manual
LB:LIGHT BLUE
BL:BLUE
Right side unit
Water
Control
valve
H2
Burning lamp
Mixing
thermistor
E1
B K
B K
Inlet
thermistor
E3
B K
Output
thermistor
E2
B K
SV3
SV2
W
SV1
MV
C2
B L B L
B L B L
O.H.C.F
Hi-
B L
limit C1
B L
W
B K
G FI
W
G
A3
Ground
W
B K
Surge
K
box
10A
W
M
B K
A2
120 VAC
Ground
G
D1
W
Parent
W
D2
B K
B K
F
TM-RE30
B K
Re mo te
W
co nt rol ler
9
CONFIDENTIAL
G;GREEN
Y:YELLOW
Gas
Porpor-
tional
Valve
BL
B K
W
G
Y WR
O
R
B L
BK
W
J
WR
G
Y
H1
R
Dipswitches
MAX button
MIN button
Increase button
Decrease button
Y
B K
B K
B K
G
B K
O
R I
C
O
G
L B
B L
A
P P
B
Igniter
P P
rod
I G
B K
A1
B R
B R
B R
B L
T r a n s -
f o r m e r
W
B K
B L
1
B L
W
R
2
R
Ver. 1.05
O:ORANGE
BR:BROWN
Flow
Sensor
W
B K R
B K R
H2
W
W
B K
Air-fuel
ratio rod
Ground
Flame
rod
G
W
O
Y
B L
R
F M
B K
B K
Thermostat
L
W
Heater
L
W
Heater
L
W
Heater
L
W
Heater
L
W
Heater
L
W
L
W W