Wire Diagrams 305E/O, 305I, 505E/O, 505I - A.O. Smith GTS-305-NE Service Manual

BY-PASS SERVO MODEL ONLY
BY-PASS FLOW
CONTROL DEVICE
FREEZE PROTECTION
OPTION
F
WATER FLOW
SENSOR
F
2
R R
QS
Y Y
BK BK
INDOOR MODEL ONLY
F
AIR TEMPERATURE
3
W
W
THERMISTOR
O
W
F
HEAT EXCHANGER
4
W
W
THERMISTOR
P
W
F
OUTGOING WATER
5
W
W
THERMISTOR
W
W
F
7
R GY
BL R
BR BL
Y Y
GY BR
WATER FLOW
E
CONTROL DEVICE
COMBUSTION FAN
THERMAL FUSES
H
OVERHEAT
2
SWITCH
MODULATING
SOLENOID VALVE POV
FLAME ROD
MAIN SOLENOID VALVE
SOLENOID VALVE 1
SOLENOID VALVE 2
SOLENOID VALVE 3
Wiring Diagram
305e/o, 305i, 505e/o, 505i
G
1
BR
O
Y
R
W
G
R
1
5
O
13
P
R
W
1 Y
FM
BK
R
F
6
R R
R R
H
1
H
3
P
P
Y
H
4
H
5
P
SV0
BK
H
6
Y
SV1
BK
H
7
BL
SV2
BK
H
8
BR
SV3
BK
On-Demand Gas Tankless Water Heater Service Manual
W Y O R BR
G
1
(CN7)
W
F A
R BK G Y
3
(CN9)
1
BL BR W W
(CN5)
Y
E
4 1
12
(CN2)
Y R
(CN12)
W BK
P P Y BR
R P BK BL
SURGE
PROTECTOR
BL
1
3
BR
1
3
D
G/Y
G/Y
1
GND GND
17
for REU-EZC
(Optional)
MAX MODULATING VALVE
CURRENT ADJUSTING
MIN
R BK
Dip SW1
1
O
1 2
F
3
F 4
5
6
7 Gas pressure
8
Dip SW2
Gas type
1
2
O
Spare Parts Only
3
F
4
5
F
6
H
B
B
1
1
1
BK
BK
Y
3
(CN1)
C
C
1
GY GY
GY
GY
IGNITER
(CN4)
D
(CN3)
1
BL
BR
3
BL BL
(W) (W)
W
W
D
2
BK
BL BL
W
FUSE
(3A)
AC120V AC120V
W BK
HOT HOT
NEUTRAL NEUTRAL
GROUND
COLOR CODING
W :White
BK:Black
BR:Brown
R :Red
BL:Blue
Y :Yellow
P :Pink
O :Orange
G :Green
GY:Gray
REMOTE CONTROLLER
SPARK
ELECTRODE
IG
GND
D
3
FROST SENSING
SWITCH
D
5
ANTI-FROST HEATER
D
4
ANTI-FROST HEATER