Navien NCB-180, Service Manual

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Point Function CN No. Wire Color Normal Value Check
J Power Input
CN1
1-2
WHITE-BLACK AC 97~138V
Confirm appropriate power source.
Confirm the FUSE.
Confirm the circuit breaker.
K Igniter
CN17
1-2
BLUE-BLUE
ON : AC 97~138V
OFF : 0V Confirm voltage when the unit is
igniting.
L Pump
CN18
1-3
YELLOW-WHITE
ON : AC 96~138V
OFF : 0V
Confirm voltage as operating.
M Fan Motor
CN8
4-7
BLACK-RED DC 127~184V Confirm steady voltage.
CN8
2-4
BLACK-YELLOW DC 15V Confirm steady voltage.
CN8
3-4
BLACK-ORANGE DC 0~7.5V
Voltage changes relative to fan
operation.
CN8
1-4
BLACK-WHITE 0~6500rpm Check PULSE.
N Auto Feeder Valve
CN21
1-2
PURPLE- PURPLE
ON: DC 22~24V
OFF: 0V
O Front Panel Controller
CON1
1~14
All BLACK