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Condensing Water Heater
Gas Conversion
Guide
Model
NPE-180A/210A/240A
NPE-150S/180S/210S/240S
This water heater is congured for Natural Gas from the
factory. If conversion to Propane Gas is required, the
conversion kit supplied with the water heater must be used.
WARNING
This conversion kit shall be installed by a qualied service
agency* in accordance with Navien’s instructions and
all applicable codes and requirements of the authority
having jurisdiction. The information in these instructions
must be followed to minimize the risk of re or explosion
or to prevent property damage, personal injury or death.
The qualied service agency is responsible for the proper
installation of this kit. The installation is not proper and
complete until the operation of the converted appliance
is checked as specied in the manufacturer’s instructions
supplied with the kit.
Procedure:
1. Turn o both gas and water supply to the water heater.
2. Using a Phillips hand screwdriver, remove 4 screws (2 from
the top and 2 from the bottom) of the front cover assembly
to gain access to the internal components. See Figure 1 for
illustration of the front cover on the unit.
Gas Valve
Gas Inlet
Pipe
Figure 1.
NPE Series Front cover
Figure 2. NPE Series
Internal Components
3. Once the front cover is removed, place it in a safe
location to prevent accidental damage. With the internal
components exposed, locate the gas inlet pipe and the Gas
Valve near the left side of the unit which are highlighted in
Figure 2.
6. Once the Gas Orice is exposed, remove the two screws
that hold the part in place. Remove the Gas Orice from
its housing and prepare the new Gas Orice for the LP
conversion for installation.
Remove two (2)
screws here
Figure 4. Access to Gas Orice in Fan Assembly
WARNING
●
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 eld 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 re natural gas ONLY.
LP
NPE-150S NPE-180A/ 210A/ 240A/ 180S/ 210S/ 240S
NG
Figure 6. Orice identication
7. Remove the Gas Orice, ensure that the packing is properly
seated inside the port, and then install the new Gas Orice
for use with LP gas. Ensure that the Orice is properly
seated on the packing inside the port before proceeding
to the next step.
Packings
Packing
8. Replace the gas inlet pipe to its original position and use
all screws to secure all connections.
Note
Do not overtighten as this may damage or
crack the components.
* A qualied service agency is any individual, rm, corporation or
company which either in person or through a representative is
engaged in and is responsible for the connection, utilization, repair
or servicing of gas utilization equipment or accessories; who is
experienced in such work, familiar with all precautions required, and
has complied with all of the requirements of the authority having
jurisdiction.
In Canada: The conversion shall be carried out in accordance
with the requirements of the provincial authorities having
jurisdiction and in accordance with the requirements of the
CAN‐B149.1 and CAN1‐B149.2 Installation Code.
Tools Required:
●
Phillips Screwdriver
●
Flathead Screwdriver
●
5
/
32
in or 4 mm Allen Wrench
●
Combustion Analyzer or Dual Port Manometer
●
Gas Leak Detector
Included Items:
●
Gas Orice (refer to below table)
Model NG LP
NPE-150S Ø 6.30 Ø 5.10
Model
NG LP
1STAGE 2STAGE 1STAGE 2STAGE
NPE-180A/NPE-180S Ø 4.80 Ø 5.95 Ø 3.80 Ø 4.70
NPE-210A/NPE-210S Ø 6.10 Ø 6.30 Ø 4.50 Ø 4.80
NPE-240A/NPE-240S Ø 6.10 Ø 6.30 Ø 4.50 Ø 4.80
Table 1. Orice Size
●
Gas Pressure and Conversion Kit Number Labels
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, nd
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 Orice.
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
O-ring
Gas Orice
Packing
O-ring
Gas Orice
Packing
<NPE-150S> <NPE-180A/ 210A/ 240A/
180S/ 210S/ 240S>
Figure 5. Exploded view of Gas assembly
DANGER
See Figure 5. Inspect the O-ring between the gas valve and
gas valve inlet adapter whenever they are disassembled.
The O-ring must be in good condition and must be
installed. Failure to comply will cause a gas leak, resulting in
severe personal injury or death.
DANGER
Inspect the O-ring between the gas valve and gas valve
inlet adapter whenever they are disassembled. The O-ring
must be in good condition and must be installed. Failure to
comply will cause a gas leak, resulting in severe personal
injury or death.
9. Set the Front Panel Dip switch according to the gas type.
WARNING
Be sure to turn o the power before changing the DIP
switch setting.
1 2
NG
1 2
LP
1 2 3 1 2 4 5 6 7 8 9 10
ON ON
10. Turn on the gas and water supply to the water heater.
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