Navien NPE-180A2 Installation Manual page 44

WARNING
NEVER start the vent run with a street elbow
at the vent collar to prevent serious injury or
death. Using an elbow directly at the collar will
not allow for a tight seal between the appliance
and the vent pipe.
ALWAYS use a length of straight pipe when
starting the vent run.
Do NOT use
Street Elbows
To avoid moisture and frost build-up and to
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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.
Do not store hazardous or flammable substances
●
near the vent termination.
If this water heater will be installed in areas where
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snow is known to accumulate, protect the vent
termination from blockage. Ensure that the vent
termination is at least 12 in. (305 mm) above the
highest anticipated snow line, or as required by
local codes, whichever is greater.
Support the vent pipe with hangers at regular
●
intervals or as required by local codes.
Exhaust and intake air pipes must be supported
at least every 4 ft (1.2 m).
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.
44 Installing the Water Heater
WARNING
ALWAYS turn on the water heater and test for
gas leaks along the exhaust vent using a bubble
test kit.
If the connections leak, carbon monoxide in the
flue gas may cause serious injury or death.
3.6.2 About the Vent Installation
Detector
This water heater unit comes pre-installed with
a Vent Installation Detector ("VID") to assist the
installer in properly installing the Vent Pipe into the
vent collar.
How It Works
As shown, the VID is a device connected to the vent
collar which is intended to detect whether the vent
pipe has been inserted to a sufficient depth (at
least 2- / " (70 mm)) into the collar during its initial
3
4
installation. If a correctly sized vent pipe (2.0 inches)
is fully inserted into the collar, it will press against
a switch to activate the VID. If the vent pipe is not
fully inserted into the collar, the unit will display an
error message and will not operate. Make sure the
vent pipe is correctly sized and has been inserted
properly if Error 762 appears.