System Details 29
4.6 Gas Conversion
NPE Series water heaters are configured 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 qualified 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 fire or explosion or to prevent
property damage, personal injury or death. The qualified
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 specified in
the manufacturer’s instructions supplied with the kit.
* A qualified service agency is any individual, firm, 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” or 4mm Allen Wrench
●
Combustion Analyzer or Dual Port Manometer
●
Gas Leak Detector
Included Items:
●
Gas Orifice (refer to below table)
Water
Heater
NG LP
1STAGE 2STAGE 1STAGE 2STAGE
NPE-180A
NPE-180S
Ø4.80 Ø5.95 Ø3.80 Ø4.70
NPE-210A
NPE-210S
Ø6.10 Ø6.30 Ø4.50 Ø4.80
NPE-240A
NPE-240S
Ø6.10 Ø6.30 Ø4.50 Ø4.80
Table 1. Orifice size
●
Gas Pressure and Conversion Kit Number Labels
Water
Heater
NG LP
NPE-150S Ø6.30 Ø5.10
Procedure:
1. Turn off 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.
Figure 1. NPE Series Front cover
Gas Valve
Gas Inlet
Pipe
Figure 2. NPE Series Internal Components
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