Navien CH-180 Service manual - page 33
31
4.5. Electrical Diagnostic Points
Point
nction
Normal Value
Check
A
Modulating
Valve
0~250mA,
DC 2~10V
Currency changes as controlling
gas volume after operating the
gas valve
Outlet Temp.
DC 0~5V
Voltage change according to
temperature.
Inlet Temp.
DC 0~5V
Voltage change according to
temperature.
Return
Temp.
DC 0~5V
Voltage change according to
temperature.
Voltage change according to
temperature.
Voltage change according to
temperature.
Supply
Temp.
DC 0~5V
Exhaust HTP
DC 4~6V
Normally input pulse. Confirm rms
voltage as measuring DC meter.
Normally input pulse. Confirm rms
voltage as measuring DC meter.
B
H.EX HTP
DC 4~6V
C
Outdoor
Temp.
DC 0~5V
DC 5V
Confirm if voltage flows without
any relations with the flow sensor
operating.
D
Flow Sensor
PULSE
Check Pulse.
DC 5V
Confirm if voltage flows without any
relations with the GPS operating.
Confirm if voltage flows without any
relations with the GPS operating.
Voltage changes as the fan
operating
Confirm if voltage flows without any
relations with the GPS operating.
E
GPS
DC 0.3~4.5V
Voltage changes according to the
GPS operating.
F
WPS
DC 0~5V
Voltage change according to water
pressure.
AC9V
AC 7~11V
Confirm output voltage.
G
AC26V
AC 22~33V
Confirm output voltage.
DC 5V
Confirm if voltage flows without any
relations with the APS operating.
H
I
J
APS
DC 0.3~4.5V
Voltage changes according to the
APS operating.
AC19V
DC Fan
Wire Color
BLACK-BLACK
RED-RED
WHITE-WHITE
BLUE-BLUE
BLACK-BLACK
WHITE-WHITE
BROWN-BROWN
ORANGE-ORANGE
RED-BLACK
WHITE-BALCK
RED-BLACK
WHITE-BLACK
BLACK-RED
YELLOW-YELLOW
WHITE-WHITE
RED-BLACK
WHITE-BLACK
BLUE-BLUE
BLACK-RED
BLACK-YELLOW
BLACK-ORANGE
BLACK-WHITE
AC 16~24V
DC 127~184V
DC 15V
DC 0~7.5V
0rpm~6500rpm
Confirm output voltage.
Check PULSE.
©Navien America Inc. 2010
CH series service Manual
Version 1.0