Appendices; Gas Conversion - Navien NCB-20LHWE Installation & Operation Manual

13. Appendices

13.1 Gas Conversion

This boiler is con gured 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 quali ed service
agency* in accordance with all applicable codes and
requirements of the authority having jurisdiction. The
information in these instructions must be followed to
minimises the risk of re or explosion or to prevent property
damage or personal injury. The quali ed 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 speci ed in the
manufacturer's instructions supplied with the kit.
* A quali ed service agency is any individual, rm, 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.
Tools Required:
Phillips Screwdriver
Flathead Screwdriver
/ in or 4 mm Allen Wrench
5
32
Combustion Analyser or Dual Port Manometer
Gas Leak Detector
Included Items:
Gas Ori ce (refer to below table)
Model
NCB-20LHWE
NCB-23LHWE
NCB-28LHWE
NCB-33LHWE Ø4.7/Ø6.05
Table 1. Ori ce Size
Gas Pressure and Conversion Kit Number Labels
Procedure:
1. Turn o both gas and water supply to the boiler.
2. Using a Phillips screwdriver, remove four screws (two at the
bottom and two at the top) 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 LHWE Series Front cover
3. Remove the front cover and place it in a safe location to
prevent accidental damage.
4. Label all the wires on the PCB.
5. Disconnect all the wires.
G20 G31
Ø5.7 Ø4.5
Ø5.7 Ø4.5
Ø5.9 Ø4.55
Ø3.8/Ø4.7
Appendices 61