Navien NCB-180 Service Manual page 61

Point Function
DHW Inlet Temperature
Sensor
HEATING Return
Temperature Sensor
DHW outlet Temperature
Sensor
A
HEATING Supply
Temperature Sensor
Exhaust Sensor
High Temperature Limit
Switch
B Outdoor sensor
C Flow Sensor
D Water Pressure Sensor
E APS
Flame Rod
F
Ground Wire
G Gas Valve
H Dual Venturi
I 3-Way Valve
58 NCB Service Manual
CN No. Wire Color
CN13
BLUE-BLUE
1-2
CN13
BLUE-BLUE
3-4
CN13 RED-RED
5-6 (BLUE-BLUE)
CN13
BLUE-BLUE
7-8
CN13
BLUE-BLUE
9-10
CN13
BLACK-BLACK
11-12
CN11 -
CN5
RED-BLACK
1-3
CN5
WHITE-BLACK
2-3
RED-
CN22
YELLOW(GREEN)-
1-2-3
BLACK
CN6
RED-BLACK
1-2
CN6
WHITE-BLACK
1-4
CN2
BLACK
1
CN2
GREEN-YELLOW
2
CN16
RED-YELLOW
1-2
CN16
WHITE-RED
1-3
CN15
BROWN-WHITE
1-4
CN15
BLUE-WHITE
4-5
CN14 BLACK-RED-
1-2-3 BROWN
Normal Value
Voltage changes according to
DC 0~5V
temperature.
Voltage changes according to
DC 0~5V
temperature.
Voltage changes according to
DC 0~5V
temperature.
Voltage changes according to
DC 0~5V
temperature.
Voltage changes according to
DC 0~5V
temperature.
DC 0V Normally Shorted. Confirm RMS voltage.
Voltage changes according to
DC 0~5V
temperature.
DC 12V Confirm steady voltage.
PULSE Check Pulse.
DC 5V Confirm steady voltage.
Voltage changes according to the APS
DC 0.3~4.5V
operation.
Measure the current when the burner is
DC 10uA
operating.
Check for properly grounded wire.
Confirm voltage as the Main Gas Valve 1
DC 22~24V
is operating.
Confirm voltage as the Main Gas Valve 2
DC 22~24V
is operating.
ON : AC 95~120V
Confirm voltage relative to operation.
OFF : 0V
ON : AC 95~120V
OFF : 0V
AC 97~138V
Check
Version 1.0