49
7. Wiring Diagram
NR66 (-SV,-OD) / N-0531S (-OD), NR71 (-SV,-OD) / N-0631S (-OD)
(GND)
(Pulse)
(VCC)
FM
SV2
SV1
SV0
DU
2
2
QS
1
1
3
2
1
1
1
3
1
2
1
1
3
1
2
1
321 4
(CN92)
2
1
324
(CN1)
65
(CN86)
15
14
12
11
13
10
(CN78)
5
1
2
4
3
1
8
7
9
6
(CN59)
3
(CN70)
12 645
(CN27)
1 4
(CN10)
3
2
6
5
2
(CN75)
(CN89B)
3
(CN89A)
1
LS
SM
2
1
1
IG
2
3
2
1
1
2
2
1
1
2
2
1
3
2
3
1
2
1
87654321
SV
IG
SV
SV
FAN SPEED
CORRECTOR
V
V
BURNING LED
<N-0631S(-OD) Model Only>
BK BK
WW
WATER OUTLET
THERMISTOR
WATER INLET
THERMISTOR
WATER FLOW
SENSOR
WW
WW
WW
WW
THERMAL FUSE
FLAME ROD
YY
RR
BLBL
BLBL
BLBL
BL
BL(-)
R(+)
BL
BL
BL
GY
BK
W
GAS VALVE
UNIT
FAN MOTOR
COLOR CODING
W : White
R : Red
BK : Black
V : Violet
O : Orange
BL : Blue
GY : Gray
G : Green
BR : Brown
Y : Yellow
BL BL
RR
R(Vcc)
BL(GND)
Y(FG)
BR(Vs)
BL
BL
BL
BL
R
Y
W
W
W
VVBK
MAIN
CIRCUIT
BOARD
R
V
BK
GO
WY
BL
V
BK
G
O
W(VCC)
R(VCC)
Y(Fully open)
BL(GND)
FLOW CONTROL
VALVE
BL
GY
BK
W
R
BL
YBR
G
WWW
BK
BK
W
GROUND
CURRENT
LEAKAGE
SAFETY DEVICE
(GFCI)
BK
WBL
W
HIGH-LIMIT
SWITCH
EARTH
WW
WW
IGNITER
ELECTRODE
BK
W
Maximum Manifold Pressure
Set Button
Minimum Manifold Pressure
Set Button
Decrease Button
Manifold Gas Pressure
Increase Button
Manifold Gas Pressure
RC-7649M
RC-7650M
(OPTIONAL)
REMOTE CONTROLLER
G
BL
R
BK
160 °F (75 °C)
140 °F (60 °C)
130 °F (55 °C)
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
BK
ANTI-FROST
HEATER
FROST SENSING
SWITCH
TRANSFORMER
<NR71/N-0631S, NR66/N-0531S Models Only>
<AC120V>
BL
W
W
BK
W
BK
W
BK
2
1
HOT
NEUTRAL
AC120V
AC100V
FROST SENSING SWITCH
ANTI-FROST HEATER
10A(FUSE)
SECONDARY
PRIMARY
VARISTOR
IGNITER
RELAY 6
RELAY 4
RELAY 2
RELAY 1
RELAY 5
DC90V
DC140V
SOLENOID VALVE 0
SOLENOID VALVE Q1
SOLENOID VALVE Q2
DC
90V
HIGH LIMIT
SWITCH
DC140V
ARRESTER
VARISTOR
EARTH
COMBUTION FAN
FAN
POWER
CONTROLLER
DC12V
PRIMARY
SECONDARY
DC15V
C
B
A
B
C
A
FAN
PULSE
CONTROL
CIRCUIT
FAN CONTROL
OUTPUT
FAN ROTATION
SPEED INPUT
FAN CURRENT
VALUE INPUT
CPU
CENTRAL
PROCESSING
UNIT
D
WATER OUTLET
THERMISTOR
WATER INLET
THERMISTOR
5V POWER CIRCUIT
GND
Sub-CPU
SUB
CONTROL
UNIT
D
EARTH
FLAME ROD
FLAME DETECTING CIRCUIT
GAS PROPORTION VALVE
POWER CONTROL CIRCUIT
DU
FR
RELAY
DRIVING
CIRCUIT
15V POWER CIRCUIT
WATER FLOW SENSOR
FLOW CONTROL VALVE
THERMAL FUSE RELAY 1
RELAY 2
RELAY 4
RELAY 5
RELAY 6
GND
NR50-OD
NR50-OD
NR66 (-SV, -OD) / N-0531S (-OD),
NR71 (-SV, -OD) / N-0631S (-OD)
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