Wiring Diagram - Noritz NR50-OD Service Manual

7. Wiring Diagram

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