Navien NCB-24LSWE, Руководство по обслуживанию, Страница: 29 / 144

NCB Service Manual 27
Version 1.0
Replace the orifice with the new LP gas orifice. Ensure that
the orifice is seated properly inside the port before
proceeding to the next step.
11. Reinstate the gas inlet pipe to its original position
and replace all of the screws and ensure all
connections are secure.
DO NOT over tighten the screws as
components may be damaged or cracked.
12. Refer to the labels carefully and then connect all the
wires.
13. Change the front panel Dip Switch settings for the
new gas type.
WARNING
Ensure that you have turned off the
power to the boiler before opening
the front cover and accessing the DIP
switches
Figure 6. Set the DIP switches
Switch Function Setting
1 & 2 Gas type
G20 (LNG) 1-OFF, 2-OFF
G25, G27(LNG) 1-OFF, 2-ON
G30 (LPG) 1-ON, 2-OFF
G31 (LPG) 1-ON, 2-ON
G20 (LNG) 1-OFF, 2-OFF
Table 1. The DIP Switch Setting by Fuel Selection
DANGER

When a gas conversion is performed,
ensure the front panel DIP switches
are set for the correct gas type.

Failure to properly set the DIP
switches can cause carbon
monoxide poisoning and result in
serious personal injury or death.
14. Turn on the gas and supply water to the boiler.
15. Measure and adjust the gas/air ratio.
Option 1. Combustion analyser (recommended)
a. Loosen the screw, rotate the plate, and then
remove the gasket to access the emissions
monitoring port as shown in Figure 8.
b. Insert the analyser into the port (Figure 8).
Figure 7. Insert the Analyser