4.3 Gas Conversion
NHB Series boilers are configured for Natural Gas at the factory.
If conversion to Propane Gas is required, use the conversion kit
supplied with the boiler.
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
in or 4 mm Allen Wrench
●
Combustion Analyzer or Dual Port Manometer
●
Gas Leak Detector
Included Items:
●
Gas Orifice (refer to table below)
Model
NG LP
1 STAGE 2 STAGE 1 STAGE 2 STAGE
NHB-055 Ø4.20 Ø3.55 Ø3.40 Ø2.80
NHB-080 Ø4.20 Ø3.55 Ø3.40 Ø2.80
NHB-110 Ø4.25 Ø5.00 Ø3.45 Ø3.85
NHB-150 Ø4.60 Ø6.90 Ø3.65 Ø5.25
Table 1. Orifice Size
●
Gas Pressure and Conversion Kit Number Labels
Procedure:
1. Turn off both gas and water supply to the boiler.
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. NHB Series Front cover
3. Once the front cover is removed, place it in a safe location to
prevent accidental damage.
4. Label all the wires on the PCB.
5. Disconnect all the wires.
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