About The Vent Installation Detector - Navien NFC-250/175H Installation Manual

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.
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
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near the vent termination.
If this boiler 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
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(300 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 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.
DANGER
If the connections leak, harmful flue gas may
cause personal injury or death. after completing
the installation and filling the boiler with water,
turn on the boiler and test for leaks using a
bubble test kit. After applying the soap solution,
bubbles will form on the connection if any leaks
exist.
5.2 About the Vent Installation
Detector
This boiler 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 into the
collar during its initial installation.
During installation, the VID detects whether the
vent pipe is fully inserted (at least 3.0 inches or 76
mm) into the collar. 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.
Venting for Combustion Air 65