Navien NHB H Series Installation And Operation Manual page 69

When PCB DIP switch 2 #8 is set to On, ensure that CPVC or polypropylene piping is used for exhaust
Note
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venting.
This unit may be installed at elevations up to 10,100 ft (3,078 m) for use with natural gas and
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propane. To use the unit at a specific altitude, the DIP switches should be set as described above.
High Altitude: Above 2,000 ft (610 m), the unit will de-rate by 3% for each 1,000 ft (305 m) of altitude
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gain for NG and 4% de-rate for propane gas.
For NG, if you install the unit at above 5,400 ft (1,646 m), it is required to change the Gas Orifice
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for high altitude. Be careful not to confuse it with the Gas Orifice for LP. Refer to "12.1 Gas & High
Altitude Conversion" on page 120 for details.
Common vent installations for use with natural gas and propane are only approved for up to 4,500 ft.
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WARNING
ALWAYS install the High Altitude Conversion Kit if needed based on the elevation of the installation location.
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For use with Propane (LP) gas, the Propane Gas & High Altitude Conversion Kit MUST be used for elevations
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up to 10,100 ft.
The Natural Gas High Altitude Conversion Kit is located inside the boiler cabinet. You will need to remove
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the front cover to access the Natural Gas High Altitude Conversion Kit.
Refer to the Natural Gas High Altitude Conversion Guide and verify the orifice is appropriate for the boiler.
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Replace the orifice following the Natural Gas High Altitude Conversion Guide instructions if required.
Setting the DIP Switches 69