Navien NHB-055 Service Manual page 64

Point Function
Exhaust Thermistor
Heating Return
Temperature Sensor
A
HEATING Supply
Temperature Sensor
High Temperature Limit
Switch
B Outdoor Thermostat
D Water Pressure Sensor
E APS
Flame Rod
F
Ground Wire
G Gas Valve
H Dual Venturi
I Power Input
J Igniter
K Fan Motor
64 NHB Service Manual
CN No. Wire Color
CN13
BLUE-BLUE
1-2
CN13
BLUE-BLUE
5-6
CN13
BLUE-BLUE
7-8
CN13
BLACK-BLACK
11-12
CN11 BLUE-BLUE
CN22
RED- -BLACK
1-2
CN6
RED-BLACK
1-2
CN6
WHITE-BLACK
2-4
CN19
BLACK
1
CN19 GREEN /
2 YELLOW
CN16
WHITE-YELLOW
1-2
CN16
WHITE-RED
1-3
CN15
BROWN-WHITE
1-2
CN15
WHITE-BLUE
2-5
CN1
WHITE-BLACK
1-2
CN17
BLUE-BROWN
1-2
CN8
BLACK-RED
4-7
CN8
BLACK-YELLOW
2-4
CN8
BLACK-ORANGE
3-4
CN8
BLACK-WHITE
1-4
Normal Value
DC 0~5V Voltage changes according to temperature.
DC 0~5V Voltage changes according to temperature.
DC 0~5V Voltage changes according to temperature.
DC 0V Normally Shorted. Confirm RMS voltage.
DC 0~5V Voltage changes according to temperature.
DC 0~5V
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 is
DC 22~24V
operating.
Confirm voltage as the Main Gas Valve 2 is
DC 22~24V
operating.
ON : AC 95~120V
Confirm voltage relative to operation.
OFF : 0V
ON : AC 95~120V
OFF : 0V
Confirm appropriate power source.
AC 97~138V Confirm the FUSE.
Confirm the circuit breaker.
ON : AC 97~138V
Confirm voltage when the unit is igniting.
OFF : 0V
DC 127~184V Confirm steady voltage.
DC 15V Confirm steady voltage.
DC 0~7.5V Voltage changes relative to fan operation.
0~6,700rpm Check PULSE.
Check
Version 1.0