Navien NCB-20LHWE, Руководство по установке и эксплуатации

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9. Loosen the hex nut at location A - the connection above the
gas valve where it connects to the pipe. See Figure 3-1 and
Figure 3-2 for reference. Once the hex nut is loose, carefully
separate the pipe from the gas valve.
10. Once the gas inlet pipe is detached from the gas valve, find
location B - the connection above the gas valve where it is
attached to the fan motor assembly. Carefully remove the
two screws (four screws for NCB-33LHWE) by hand using a
Phillips screwdriver and pull the gas inlet pipe away from
the fan assembly to access the gas orifice.
Location B:
Remove 2 screws
here
Location A:
Loosen the hex
nut here
Figure 3-1. Detaching Gas Inlet Pipe from
Gas Valve and Fan Motor Assembly (NCB-20/23/28LHWE)
Location B:
Remove 4 screws
here
Location A:
Loosen the hex
nut here
Figure 3-2. Detaching Gas Inlet Pipe from
Gas Valve and Fan Motor Assembly (NCB-33LHWE)
Once the Gas Orifice is exposed, remove the two screws that
hold the part in place. Remove the Gas Orifice from its housing
and prepare the new Gas Orifice for the LP conversion for
installation.
Remove 2
screws here
Figure 4-1. Access to Gas Orifice in Fan Assembly
(NCB-20/23/28LHWE)
Remove 2
screws here
Figure 4-2. Access to Gas Orifice in Fan Assembly
(NCB-33LHWE)
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 or substantial property
damage. The Navien NCB LHWE boilers are shipped
ready to fire natural gas only.
63 Appendices