22 • Condensing Models: On-Demand Water Heater Service Handbook
TR
OUBLE
SHOO
TING
WIRING DIAGRAM
9
8
7
6
5
4
3
2
1
10
OFF
Remote controller
Flow
adjust
valve
R
BK
R
W
BK
Flow
sensor
Ground
G
O
W
Y
BL
O
R
FM
PCB
W
120 VAC
G
Ground
SW
Ground
W
BK
G
IG
Igniter rod
P
73
53
9
3
O
R
G
LB
BL
SV3
SV2
SV1
MV
O.H.C.F
BL
Hi-
limit
BL
W
R
BL
BL
BL
BL
P
BK
BK
BK
BK
Outlet thermistor
Inlet thermistor
Surge
box
Hi-limit switch
for exhaust
Exhaust
thermistor
W
Indoor Model Only
BK
W
BK
DIPswitches
Y
W
W
W
Y
Flame rod
BK
W
Thermostat
Heater
Heaters
Indoor Model Only
Gas
Valve
W
BK
W
BK
controller
Indoor Model Only
W
Y
Y
Y
(for the secondary
heat exchanger)
(for the heat exchanger
and water pipes)
(for the drain hose)
(for the water pipes)
(for the water inlet)
(for the water outlet)
Temperature
Green LED
B
C
C2
C1
G
A
A1
A2
B1
F
J
H2
E1
H1
E2
I
K2
K1
L
W: WHITE
R: RED
BK: BLACK
P: PURPLE
LB: LIGHT BLUE
BL: BLUE
G: GREEN
Y: YELLOW
O: ORANGE
BR: BROWN
Figure 10. Wiring Schematic and Check Point Locations
For instructions on how to use the checkpoints shown above, refer to the water
heater’s maintenance sheet. The maintenance sheet is stored in a pouch on the
inside of the water heater’s front cover.
