109Appendixes
6. Once the Gas Orifice is exposed, remove the two
screws that hold the part in place. Remove the
Gas Orifice from its housing and prepare the
new Gas Orifice for the Propane or High Altitude
conversion for installation.
Remove two (2)
screws here
Figure 4. Access to Gas Orifice in Fan Assembly
WARNING
Fire and Explosion Hazard
To prevent serious injury or death:
●
DO NOT adjust or attempt to measure gas
valve outlet pressure. The gas valve is factory-
set for the correct outlet pressure. This setting
is suitable for natural gas and propane,
requiring no field adjustment.
●
Attempting to alter or measure the gas valve
outlet pressure could result in damage to
the valve, causing potential severe personal
injury, death or substantial property damage.
Navien water heaters are shipped ready to
fire natural gas ONLY.
Gas Valve
Gas Inlet
Pipe
Figure 2. NPE-A2/S2 Series
Internal Components
3. Once the front cover is removed, place it in a safe
location to prevent accidental damage. With the
internal comp
onents exposed, locate the gas
inlet pipe and the Gas Valve near the left side of
the unit which are highlighted in Figure 2.
4. Use a Phillips screwdriver to remove the two
screws at Location A - the connection below
the Gas Valve where it connects to the pipe.
See Figure 3 for reference. Once the screws are
removed, carefully separate the pipe from the
Gas Valve.
5. Once the gas inlet pipe is detached from the
Gas Valve, find Location B - the connection
above the Gas Valve where it is attached to the
Fan Motor Assembly. Carefully remove the four
screws by hand using a Phillips screwdriver and
pull the Gas Valve away from the Fan Assembly
to access the Gas Orifice.
Location B:
Remove four
(4) screws here
Location A:
Remove two (2)
screws here
Figure 3. Detaching Gas Valve from
Gas Inlet Pipe and Fan Motor Assembly
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