71Appendixes
7.1 Gas Conversion
This water heater is 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.
DANGER
Do not perform a gas conversion without an officially approved
conversion kit and the instructions supplied by Navien. Gas
conversion using any other parts will result in extremely
dangerous burner operation, leading to fire, explosion, severe
personal injury, or death.
WARNING
Ɣ
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.
Ɣ
Turn off electrical supply to the water heater and close the
manual gas shut-off valve to isolate the water heater during
conversion. Allow the water heater to cool if it has been
operating.
Ɣ
For propane water heaters: The propane supplier mixes an
odorant with the propane to make its presence detectable.
In some instances the odorant can fade, and the gas may
no longer have an odor. Before startup (and periodically
thereafter), have the propane supplier verify the correct
odorant level in the gas.
* 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 CANB149.1 and
CAN1B149.2 Installation Code.
Tools Required:
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Phillips Screwdriver
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Flathead Screwdriver
Ɣ
5
/
32
in or 4 mm Allen Wrench
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Combustion Analyzer or Dual Port Manometer
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Gas Leak Detector
Included Items:
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Gas Orifice (refer to below table)
Water Heater NG LP
NPE-150S Ø6.30 Ø5.10
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
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Gas Pressure and Conversion Kit Number Labels
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
7. Appendixes
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