Navien NCB-180 Installation & Operation Manual page 62

240LP
Figure 6. Orifice Identification
Replace the old Orifice piece with the new part for use with LP gas.
Ensure that the Orifice is properly seated inside the port before
proceeding to the next step.
11. Replace the gas inlet pipe to its original position and use all
screws to secure all connections.
Do not overtighten as this may damage or crack
Note
the components.
DANGER
Inspect the O-ring between the gas valve and gas valve inlet
adapter whenever they are disassembled. The O-ring must be
in good condition and must be installed. Failure to comply will
cause a gas leak, resulting in severe personal injury or death.
12. Place the PCB assembly back on to the boiler and tighten the
three screws.
13. Check the labels carefully and then connect all the wires.
240NG
14. Set the front panel Dip Switch to change the gas type. For LP,
set Dip Switch 2 #2 to On. For NG, set DIP SW2 #2 to Off.
WARNING
Ensure that you have turned off the power to the boiler before
accessing the DIP switches.
ON
1 2 3 4 5 6
DANGER
When conversion is required, be sure to set the front panel
●
DIP switches according to the supply gas type.
Failure to properly set the DIP switches could cause carbon
●
monoxide poisoning, resulting in severe personal injury or
death.
15. Turn on the gas and water supply to the boiler.
ON
7 8 9 10 1 2
NG LP
ON ON
2 2
Appendixes 61