Navien NCB-700-2S+/42K Service Manual page 25

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. Navien NCB700 boilers are shipped ready to fire
natural gas only.
Figure 5-1. Exploded View of Gas Pipe Assembly
(NCB700-2S+/42K)
24 System Details
Packing
Gas Orifice
Packing
Figure 5-2. Exploded View of Gas Pipe Assembly
(NCB700-3S/54K)
DANGER
See Figure 5-2. Inspect the O-ring between the venturi 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.
Packing
Gas Orifice
O-ring