Navien NHB Series, Installation & Operation Manual

Page: 53 / 135

53 Venting the Boiler
DANGER
If the connections leak, harmful flue gas may cause personal
injury or death. After completing the installation and filling the
water heater with water, turn on the water heater and test for
leaks using a bubble test kit. After applying the soap solution,
bubbles will form on the connection if any leaks exist.
CAUTION
Do not start the vent run with a street elbow at the vent
collar. Using an elbow directly at the collar will not allow for a
tight seal between the appliances and vent pipe. A length of
straight pipe must be used when starting the vent run.
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To avoid moisture and frost build-up and to maintain clearances
to openings on adjacent homes, 45° elbows, 90° elbows, or tees
may be attached to the end of the termination vent pipe to
direct the exhaust plumes away from buildings, as long as the
total allowable vent lengths, maximum number of elbows, and
distances to air intake restrictions are observed.
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Do not store hazardous or flammable substances near the vent
termination.
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If this boiler will be installed in areas where snow is known to
accumulate, protect the vent termination from blockage.
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Provide a minimum of 1 foot clearance from the bottom of the
exhaust above the expected snow accumulation level. Snow
removal may be necessary to maintain clearance.
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Ensure that the vent termination is at least 12 in (305 mm) above
ground, 12 in (305 mm) above the highest anticipated snow
level, or as required by local codes, whichever is greater.
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Support the vent pipe with hangers at regular intervals or as
required by local codes.
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Exhaust and intake air pipes must be glued and properly
supported at least every 4 ft (1.2 m).
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The vent for this appliance shall not terminate over public
walkways; or near soffit vents or crawl space vents or where
condensate or vapor could create a nuisance or hazard or cause
property damage; or where condensate or vapor could cause
damage or could be detrimental to the operation of regulators,
relief valves, or other equipment.