55
Venting for Combustion Air
WARNING
ALWAYS turn on the boiler 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.
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 2-3/4” (70 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.
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
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 boiler will be installed in areas where
snow is known to accumulate, protect the vent
termination from blockage.
●
Ensure that the vent termination is at least 12 in
(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.
