Gas Conversion - Navien NCB-24LSWE Service Manual

4.3 Gas Conversion

This default gas supply configuration for this boiler is
Natural Gas. If it is converted to Propane Gas, the
conversion kit supplied with the boiler must be used.
WARNING
This conversion kit must be installed
by a qualified service agent*. All
conversions must be performed in
accordance with all applicable laws
and regulations. The information in
these instructions must be followed
to minimise the risk of fire or
explosion and to prevent property
damage, personal injury, or death.
The service agent is responsible for
the correct installation of the kit. The
conversion 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 agent is any individual, firm, corporation or
company who either in person or through a representative is
engaged in and is responsible for the connection, installation,
repair, or servicing of gas equipment or accessories. Qualified
service agents are experienced in gas appliance work,
familiar with all safety precautions, and has comply with all
applicable laws and regulations.
Tools required:
 Phillips screwdriver
 Flathead screwdriver
 4 mm (5/32 in ) Allen wrench
 Combustion analyzer or dual port manometer
 Gas leak detector
Version 1.0
Included Items:
 Gas orifice specifications
Model
NCB-24LSWE
NCB-28LSWE
NCB-34LSWE
NCB-40LSWE Ø4.8/Ø6.05
Table 1. Orifice sizes
 Gas pressure and conversion kit labels
Procedure:
1. Turn off the gas and water supplies to the boiler.
2. Use a Phillips screwdriver to remove the two screws
(one at the left bottom and one at the right bottom)
from the front cover assembly to gain access to the
internal components. Refer to Figure 1 for an
illustration of the front cover on the unit.
Figure1. B LSWE Series front cover
3. Remove the front cover and place it in a safe location
to prevent accidental damage.
4. Label all of the PCB wires.
5. Disconnect all wires from the PCB.
NG LP
Ø5.7 Ø4.5
Ø5.7 Ø4.5
Ø5.9 Ø4.55
Ø3.8/Ø4.7
NCB Service Manual 23