Navien NP Condensing Tankless Gas Water Heater - Service Manual

Point Function Wire Color Normal Value Check
K
AC19V
BLUE-BLUE
AC 16~24 V
Confirm output voltage.
BLACK-RED
DC 127V~184 V
Confirm if voltage flows without any
relations with the fan operating.
L
Fan Motor
BLACK-YELLOW
BLACK-ORANGE
DC 15 V
DC 0~7.5 V
Confirm if voltage flows without any
relations with the fan operating.
Voltage changes as the
fan operating.
BLACK-WHITE
0 rpm~6500 rpm
Check PULSE.
M
Power Input
BLUE-BLACK
AC 97~138 V
Confirm approval of the
1st power resource.
Confirm the FUSE.
Confirm the circuit breaker.
N
Water Adjust
Valve (CW)
Water Adjust
Valve (CCW)
BLUE-YELLOW
BLUE-ORANGE
ON : AC 97~138 V
OFF : 0V
ON : AC 97~138 V
OFF : 0V
Confirm voltage as operating.
Confirm voltage as operating.
O
Igniter
BLUE-BLUE
ON : AC 97~138 V
OFF : 0V
Confirm voltage asignition
operating.
P
Pump
BROWN-WHITE
BROWN-BLACK
ON : AC 97~138 V
OFF : 0V
ON : AC 97~138 V
OFF : 0V
Confirm voltage as operating.
Confirm voltage as operating.
BROWN-BROWN
ON : DC 83~120 V
OFF : 0V
Confirm voltage as the
Main Gas Valve operating.
Q
Gas Valve
YELLOW-YELLOW
ON : DC 83~120 V
OFF : 0V
Confirm voltage as the
Gas Solenoid Valve 1 operating.
RED-RED
ON : DC 83~120 V
OFF : 0V
Confirm voltage as the
Gas Solenoid Valve 2 operating.
R
P.E
Flame Rod
GREEN
BLACK
Protect Earth
0~20 uA
Same to the case earth Protect Earth.
Measure the currency as sensing flame.
S
Power trans
AC150V
Power trans
AC120V
RED-RED
WHITE-BLACK
AC 123~177 V
AC 97~138 V
Confirm output voltage.
Confirm output voltage
T
Motorized
2-way Valve
BLACK-BLUE-RED
ON : AC 97~138 V
OFF : 0 V
Confirm voltage as Motorized
2-way Valve operating.
©Navien America Inc. 2010
42
NR/NP series service Manual
Version 2.0