58 Appendixes
10.1 Gas Conversion
This boiler is configured for Natural Gas from the factory. If
conversion to Propane Gas is required, the conversion kit supplied
with the boiler must be used.
WARNING
This conversion kit shall be installed by a qualified service
agency* in accordance with Navien America’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 4mm Allen Wrench
●
Combustion Analyzer or Dual Port Manometer
●
Gas Leak Detector
Included Items:
●
Gas Orifice (refer to below table)
Model
NG
LP
1STAGE
2STAGE
1STAGE
2STAGE
NCB-180
Ø4.80
Ø5.95
Ø3.80
Ø4.60
NCB-210
Ø6.10
Ø6.30
Ø4.50
Ø4.80
NCB-240
Ø6.10
Ø6.30
Ø4.50
Ø4.80
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 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. NCB 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.
10. Appendixes
