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WIRING DIAGRAM
A wiring diagram is located on the inside front panel of the appliance.
Electrical Rating: 120 VAC, 60 Hz.
Note: If any of the original wiring supplied with this appliance must be replaced, it must be replaced with
appliance wiring material (180c) or its equivalent. Wires are available through the manufacturer.
BK:BLACK
P:PURPLE
Left side unit
Water
Control
valve
Y
R
Burning lamp
Mixing
thermistor
B K
Inlet
thermistor
B K
Output
thermistor
B K
SV3
SV2
B L
SV1
MV
B L
B L
B L
B L
O.H.C.F
Hi-
B L
limit
B L
G
G
Ground
Ground
Draft switch
Priority SW
Button to check
unit number
Error call
button
Pump test run
7 Seg LED
LB:LIGHT BLUE
BL:BLUE
Porpor-
Flow
tional
Sensor
Valve
BL
BK
W
G
Y
WR
B K
O
R
BR
BK
W
B K R
G
WR
Dip switch
(untouchable)
MAX button
MIN button
Increase button
Decrease button
Y
Y
B K
Air-fuel
B K
ratio rod
B K
B K
G
Ground
O
R
Flame
O
rod
G
L B
B L
R
F M
P
P
Elect
P
P
rod
I G
B K
Pump
port
Alarm
contact
FM
port
Dip switch (untouchable)
Communication
lamp (right)
1 2 3 4 5 6
7
8
Communication
O F F
lamp (left)
1 2 3 4 5 6
7
8
O F F
Dip switch
Indicator light for operation unit
(Adjustable)
in Easy link or Multi unit system
G;GREEN
Y:YELLOW
Right side unit
Water
W
R
Control
valve
W
R
Burning lamp
Mixing
thermistor
W
B K
B K
Inlet
thermistor
B K
Output
thermistor
B K
SV3
SV2
W
SV1
O
Y
MV
B L
B L
B L
B L
O.H.C.F
Hi-
B L
limit
B L
W
B K
G F I
W
G
Ground
W
B K
Fuse
box
10A
W
B K
AC120V
Ground
G
W
Master
W
B K
B K
Remote
B K
controller
W
port
- 38 -
O:ORANGE
BR:BROWN
Porpor-
Flow
tional
Sensor
Valve
BL
BK
W
G
Y
WR
B K
O
R
BR
BK
W
B K R
G
WR
Y
Dip switch
(untouchable)
MAX button
MIN button
Increase button
Decrease button
Y
Air-fuel
B K
ratio rod
B K
B K
G
B K
Ground
O
Flame
R
rod
O
G
L B
B L
B L
R
F M
P
P
Elect
P
P
rod
I G
B K
B K
Thermostat
B R
B R
B R
B L
T r a n s -
f o r m e r
W
B K
B L
SLAVE
B L
IN
W
SLAVE
R
R
OUT
W
W
R
W
W
B K
W
O
Y
B K
W
Heater
W
Heater
W
Heater
W
Heater
W
Heater
W
W
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