Appendixes; Gas Conversion - Navien NFB-175 Mode D'emploi

12. Appendixes

12.1 Gas Conversion

This boiler is 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 must 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
●
/ in or 4 mm Allen Wrench
5
●
32
Combustion Analyzer or Dual Port Manometer
●
Gas Leak Detector
●
Included Items:
Gas Orifice (Table 1)
●
Gas Pressure and Conversion Kit Number Labels
●
NG
Model
1 STAGE 2 STAGE
NFB-175 Ø4.8
NFB-200 Ø6.1
Table 1. Orifice Size
LP
1 STAGE 2 STAGE
Ø6.6 Ø3.9 Ø5.0
Ø6.6 Ø4.5 Ø4.9
Procedure:
1. Turn off both gas and water supply to the boiler.
2. Unfasten the 4 latches (2 at the top and 2 at the bottom)
to remove the front cover and gain access to the internal
components. See Figure 1 for illustration of the front cover
clamps.
Figure 1. NFB Series Front cover
3. Remove the front cover and place it in a safe location to
prevent accidental damage.
4. With the internal components exposed, locate the gas inlet
pipe and the gas valve, as shown in Figure 2.
Figure 2. NFB Series Internal Components
Gas Valve
Gas Inlet Pipe
Appendixes 97