126 Appendixes
GAS : NG
20049500A
4.50 / 6.30
GAS : NG
20051240A
4.65 / 6.50
GAS : LP
20050545A
3.65 / 4.95
<NCB-190/060H, 190/080H Orifice Identification>
GAS : NG
20049501A
4.80 / 7.50
GAS : NG
20051241A
5.05 / 7.75
GAS : LP
20050546A
3.90 / 5.65
<NCB-240/110H, 240/130H, 250/150H Orifice
Identification>
Figure 6. Orifice Identification
8. Remove the Gas Orifice, ensure that the packing
is properly seated inside the port, and then
install the new Gas Orifice for use with LP gas.
Ensure that the Orifice is properly seated on the
packing inside the port before proceeding to
the next step.
Packing
9. Replace the gas inlet pipe to its original position
and use all screws to secure all connections.
Note
Do not overtighten as this may
damage or crack 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.
WARNING
●
DO NOT adjust or attempt to measure gas
valve outlet pressure. The gas valve is factory-
set for the correct outlet pressure. This setting
is suitable for natural gas and propane,
requiring no field adjustment.
●
Attempting to alter or measure the gas valve
outlet pressure could result in damage to
the valve, causing potential severe personal
injury, death or substantial property damage.
Navien NCB-H boilers are shipped ready to
fire natural gas ONLY.
O-ring
O-ring
Gas Orifice
Packing
Figure 5. Exploded View of Gas Pipe Assembly
DANGER
See Figure 5. 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.
Summary of Contents for NCB-190/060H
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