Navien CH-180 Service manual - page 46
44
4.6.12. GPS
Navien Part No.
Function
Check Point
NASS9EXGPS01
A
Failure Event
1. Gas leak from the valves.
Effects
Error Code
E035, E048(only PG model)
Diagnostic
Color /
Number of wires
1. Red- black : DC 5 V
2. White – black : DC 0.3 ~ 4.5 V
1. Sensing the gas-pressure for gas velocity to control combustible air
supply.
2. GPS device automatically detects the quantity of gas supply in any
moment for ideal combustion with proper air supply.
3. The unit is designed to operate properly even when there’s low gas
pressure supply (within certain range of gas pressure 95 %) because
GPS makes if possible to check and modulate gas ratio for stable
combustion.
1. Gas leak from the unit.
2. No flames.
3. No operation of the unit.
4. Excess carbon monoxide emissions.
1. Visual inspection: Connection and/or breakage of wires.
2. Voltage check: Check range of voltage shown below.
©Navien America Inc. 2010
CH series service Manual
Version 1.0