Service manual
– 13 –– 12 –
Wiring Diagram and Inspection Flowchart
FR
DU
D
GND
<CN1>
BK BL
29
30
COLOR CODING
BK
W
IGNITER
W
W
W
W
IG
FM
THERMAL FUSE
LS
SM
SM
LS
R
R
(VCC)
BR(Vs)
R(Vcc)
BL(GND)
Y(FG)
BL
BL
BL
BL
(Fully open)
(GND)
BL
Y
Y
BL
BL
Y
R
BR
BL
Y
R
BR
BR RBLY
<CN27>
WW
(VCC)
BK
(VCC)
V
G
O
W
(Fully open)
(VCC)
(GND)
R
O
Y
G
BL
G
O
V
BK
Y
O
R
1
2
1
2
1
2
1
2
3
4
1
2
3
4
5
6
7
8
1
2
2
1
1
1
3
1
2
3
4
1
2
1
2
1
2
1
2
3
1
2
3
3
2
1
3
2
1
4
5
6
7
8
G
BL
BK
V
BK
V
<CN78>
BL
32
31
BL
W
W
W
W
W
W
WW
W
W
W
W
W
BK
V
18 17
O
Y
Y
V
28
26
24
22
27
25
23
21
19
20
R
R
G
G
10
7
6
9
7
5
16
12
14
15
13
11
O
<CN38>
BL
R
4 3
12
<CN89>
BL
BL
IGNITER
<CN101>
DC15V
DC90V
THERMAL FUSE
GND
BK
W
CPU
D
B
C
DC12V
C
SV3
SV2
SV0
SV1
IG
A
B
A
DC90V
3
2
4
6
5
BL
<CN104>
Y
W W
O
G
<CN102>
<CN92>
BL W
<CN89A>
BLBL
BL
BL
R
<CN10>
W
G
BKW
GY
W
BK
BL
BK
O
O
GY
W
BL
BK
W
R
BK
<CN184>
G
BL
BL
1
R
R
BL
BK
G
BL
BL
W
3
10A(FUSE)
NEUTRAL
O
SV
O
W
GY
BL
BK
W
W
0
10
BL
R
3
2
1
4
BL
-
+
R
DU
11
12
13
GY
GY
O
BK
BK
2
SV
SV
1
SV
3
1
2
4
Decrease Button
Set Button
Set Button
8
BL
6
<CN102>
W Y OR
1
5
32 4
W
3
<CN63>
WW
21
W
74
5
6
321 4
345 2 1
3 2 1
34 2 134 2 1
34 2 1
3 2 1
2 1 2 1 2 1 2 1
1 2 1 2 1 2 1 2
8
75 6
531
1
62 4
5
<CN75>
<CN70>
W
3
1
2
3
1
2
Y
R
4
3
1
2
11
Y
BL
10
9
8
6
5
4
3
1
2
6
7
5
4
3
1
2
8
6
7
9
13
15
14
12
<CN184>
6
5
184
3
W W
3
2
BK
R
1
2
BK
R
6
5
1
5
4
6
G
BL
BL
W(R)
BK(G)
R(W)
G(BK)
BL
BL
(W)R
(BK)G
(R)W
(G)BK
BL
BL
5
4
6
G
BL
BL
(GND)
(Vcc)
(Pulse)
R
Y
BL
R
BL
Y
QS
BL
BL
DC140V
DC140V
W
BL
W
BL
BL
BL
W
BL
BL
BL
BL
FLAME DETECTING CIRCUIT
W
W
W
W
BR
BL
Y/G
BL BL
W
W
TRANSFORMER
W
W
Y/G
BR
BL
BR
BL
GY
GY
BL
W WWW
W
W
W
W
WW W W
W
W
W
W
Y/G
W WWW
W
W
W
W
WW W W
W
W
W
W
BR
BR
R
R
R
W
W
W
W
W
W
BK BK
BK
W
G
(GND)
V
V
W
G
W
W
W
W
R
(GND)
R
R
W
R
2
3
BL
W
W
W
G
R
(OPTIONAL)
(OPTIONAL)
B5
1
2
R
BK
RBK
V
R
R
VARISTOR
ARRESTER
1
2
3
1
2
3
1
2
1
3
2
1
3
2
1
3
WATER LEVEL
ELECTRODE 2
WATER INLET
THERMISTOR
WATER OUTLET
THERMISTOR
HEAT EXCHANGER
THERMISTOR
BURNING LED
MAIN
FLOW
CONTROL
VALVE
BYPASS
FLOW
CONTROL
VALVE
WATER LEVEL
ELECTRODE 1
FLAME ROD
FAN MOTOR
REMOTE CONTROLLER
RC-7508M
RC TERMINAL
IGNITION
ELECTRODE
EARTH
HIGH-LIMIT SWITCH
(FOR PRIMARY HE AT
EXCANGER)
HIGH-LIMIT SWITCH
(FOR FLUE BOX)
SYSTEM CONTROLLER
SC-201-6M INT
CURRENT
LEAKAGE
SAFETY DEVICE
(GFCI)
POWER CORD
<AC230V>
EARTH EARTH
EARTH
FROST SENSING
SWITCH
ANTI-FROST HEATER
W : White
R : Red
BK : Black
V : Violet
O : Orange
BL : Blue
GY : Gray
G : Green
BR : Brown
Y : Yellow
EARTH
POWER
CIRCUIT
BOARD
MAIN
CIRCUIT
BOARD
WATER FLOW SENSOR
EXTERNAL POWER
CHANGE 3P CONNECTOR
(OPTIONAL)
CHANGE GAS CATEGORY
Other Unit in
Quick Connect
Multi System
MAIN CIRCUIT
BOARD
Manifold Pressure
Increase Button
Manifold Pressure
Minimum Manifold Pressure
Maximum Manifold Pressure
(For Quick Connect Multi System Only)
Quick Connect Cord(Optional)
GAS PROPORTIONING
VALVE
GAS
SOLENOID
VALVE
UNIT
HOT
VARISTOR
EARTH
FROST SENSING
SWITCH
AN T I - F R O S T HEATER
AC230V
AC100V
CIRCULATION PUMP
RELAY 7
RELAY 10
RELAY 9
RELAY 3
RELAY 1
RELAY 4
RELAY 5
SOLENOID
VALVE 0
SOLENOID
VALVE 1
SOLENOID
VALVE 2
SOLENOID
VALVE 3
HIGH LIMIT
SWITCH
POWER
CONTROLLER
FAN
COMBUTION FAN
PRIMARY
SECONDARY
15V POWER CIRCUIT
WATER FLOW SENSOR
MAIN FLOW CONTROL VALVE
BYPASS FLOW CONTROL VALVE
WATER LEVEL
ELECTORODE 1
RELAY 1
RELAY 3
RELAY 5
RELAY 7
RELAY 10
RELAY
DRIVING
CIRCUIT
CENTRAL
PROCESSING
UNIT
GAS PROPORTIONING VALVE
POWER CONTROL CIRCUIT
FLAME ROD
EARTH
FAN CONTROL
OUTPUT
FAN ROTATION
SPEED INPUT
FAN CURRENT
VALUE INPUT
FAN
PULSE
CONTROL
CIRCUIT
Sub-CPU
SUB C
ONTROL
UNIT
WATER OUTLET
THERMISTOR
WATER INLET
THERMISTOR
HEAT EXCHANGER
THERMISTOR
AIR INLET
THERMISTOR
WATER LEVEL
ELECTORODE 2
5V POWER CIRCUIT
PRIMARY
SECONDARY