Dunkirk Q90-200 Installation, Operation & Maintenance Manual page 14

Consideration for following should be used when
5.
determining appropriate location for termination of
combustion air and vent piping:
• Comply with all clearances required as stated in
paragraph 6 (below).
• Termination should be positioned where vent
vapors will not damage plants/shrubs, air
conditioning equipment, or siding on the house.
• Termination should be positioned so that it will not
be effected by wind eddy, air born leaves, snow, or
recirculated fl ue gases.
• Termination should be positioned where it will
not be subjected to potential damage by foreign
objects, such as stones, balls, etc.
• Termination should be positioned where vent
vapors are not objectionable.
• Put vent on wall away from prevailing winter wind.
Locate or guard vent to prevent accidental contact
with people or pets.
• Terminate vent above normal snow-line. Avoid
locations where snow may drift and block vent.
Ice or snow may cause boiler to shut down if vent
becomes obstructed.
• Under certain conditions, fl ue gas will condense,
forming moisture, and may be corrosive. In such
cases, steps should be taken to prevent building
materials at the vent from being damaged by
exhaust of fl ue gas.
Venting system shall terminate at least 3 feet
6.
(0.3m) above any forced air inlet (except the boiler's
combustion air inlet) within 10 feet (3m). The venting
system shall terminate at least 12 inches (300mm)
from any air opening into any building. Bottom of vent
shall be located at least 12 inches (300mm) above
grade. Termination of vent shall be not less than 7 feet
(2.1m) above adjacent public walkway. Vent terminal
shall not be installed closer than 3 feet (0.9m) from
inside corner of L shaped structure. Termination of
vent should be kept at least 3 feet (0.9m) away from
vegetation.
If multiple terminations are used, there must be minimum
of 12 inches (300 mm) between exhaust of one termination
and air intake of next termination. See Figures 1–3 for
illustrations.
United States - Terminate vent system at least 4 feet
(1.22 m) horizontally from, and in no case above or below,
unless a 4 feet (1.22 m) horizontal distance is maintained,
from electric meters, gas meters, regulators and relief
equipment.
COMBUSTION AIR AND VENT PIPE
Canada - Terminate vent system at least 6 feet (1.83m)
horizontally from, and in no case above or below,
unless 6 feet (1.83m) horizontal distance is maintained,
from electric meters, gas meters, regulators and relief
equipment.
Installation
Attach combustio
1.
2" coupling on CVI gas valve. Attach vent piping to
furnished 2" CPVC vent tee on draft inducer outlet.
Working from boiler to outside, cut pipe to required
2.
length(s).
Deburr inside and outside of pipe. Remove all chips and
3.
shavings.
Chamfer outside edge of pipe for better distribution of
4.
primer and cement.
Clean and dry all surfaces to be joined.
5.
Check dry fi t of pipe and mark insertion depth on pipe.
6.
After pipes have been cut and pre-assembled, apply
7.
cement primer to pipe fi tting socket and end of pipe to
insertion mark. Quickly apply approved cement to end
of pipe and fi tting socket (over primer). Apply cement
in light, uniform coat on inside of socket to prevent
buildup of excess cement. Apply second coat.
While cement is still wet, insert pipe into socket with
8.
¼ turn twist. Be sure pipe is fully inserted into fi tting
socket.
Wipe excess cement from joint. Continuous bead of
9.
cement will be visible around perimeter of properly
made joint.
Handle pipe joint carefully until cement sets.
10.
Support combustion air and vent piping minimum of
11.
every 5 feet using pre-formed metal hanging straps. Do
not rigidly support pipes. Allow for movement due to
expansion and contraction.
Slope combustion air and vent pipes toward boiler
12.
minimum of ¼" per linear foot with no sags between
hangers.
Use appropriate methods to seal openings where vent
13.
and combustion air pipes pass through roof or side
wall.
14
NOTICE
All fi eld installed vent pipe must be 3".
n air intake piping to supplied Fernco
NOTICE
All pipe joints are to be water tight.
NOTICE
It is recommended all pipes be cut, prepared,
and pre-assembled before permanently
cementing any joint.
NOTICE
Rigid supports will cause excess noise in vent
piping.