Dunkirk XEB-2 Installation Instructions Manual page 14

c) For single wall pipe through non-combustible
walls, the hole through the wall need only be
large enough to maintainthe pitch of the vent
pipe,and provide proper sealing.Athimble is
not required for single wall pipe passing
through noncombustiblewalls.
d) The venting system shall terminate at least 3
feet above any forced air inlet located within
10 feet. The venting system shall terminate
at least 4 feet below, 4 feet horizontally from,
or 1 foot above any door, window, or gravity
air inlet into any building. The bottom of the
vent shall be located at least 12 inches above
grade. Termination of the vent shall be not
less than 7 feet above an adjacent public
walkway. The vent terminal shall not be
installed closer than 3 feet from the inside
corner of an L shaped structure. Termination
of the vent should be kept at least3 feet away
from vegetation. The venting system shall
terminateat least4 feet horizontallyfrom, and
in no case above or below, unless a 4 foot
horizontaldistanceis maintained,fromelectric
meters, gas meters, regulators, and relief
equipment.
e) The venting system shall terminate at least 4
feet below any eave, soffit, or roof overhang.
f) The venting system shall not terminate
underneath any deck, patio, or similar
structure.
g) Put vent on a wall away from the prevailing
winterwind.Locateor guardthe vent to prevent
accidental contact with people or pets.
h) Terminate the vent above normal snowline.
Avoid locationswhere snowmay driftandblock
the vent. Ice or snow may cause the boiler to
shut down if the vent becomes obstructed.
i) Undercertainconditions,fluegaswill condense,
forming moisture. Insuch cases, steps should
be taken to prevent building materials at the
vent terminal from beingdamaged by exhaust
of flue gas.
8. Joining and Sealing the Vent Pipe:
The vent pipe needs to be both watertight and
gastight. Seal all joints and seams as follows:
A. For Z-Flex Z-Vent stainless steel vent pipe
use a high temperature red silicone sealant rated
for 500°F. The outside of the male end and inside
of the female end of the pipe must be cleaned with
brake cleaner before applying silicone bead.
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For 3" vent pipe runs begin with the male end of
the vent pipe over the boilers induced draft
blower outlet. For 4" vent pipe runs begin with a
6" length of 3" Z-Vent (#02SVEPxx0306) over
the boiler's induced draft blower outlet, to which
an even bead of high temperature silicone sealant
should be applied. Then connect the 3" Z-Vent
to a Z-Vent 3" to 4" reducer (#02SVERxx0403).
Then continue the 4" Z-Vent pipe run by
connecting the 4" male end of the Z-Vent to the
reducer. (A locking band may be used around
this joint for additional support.) Then following
the sealing instructions, push the 4" male end of
the Z-Vent over the 4" increaser fitting. When
using the Tjernlund VH-1 vent hood, the female
end (flared end) of the vent pipe will be
connected to the termination hood. The male
end of the vent hood must be crimped before
pushing the Z-Vent over the vent hood's
connecting pipe. Before the pipes are joined,
apply a 1/4" bead of silicone one inch from the
end of themale end. Then push the pipes
together as far as they will go making sure any
seams are aligned and oriented upward. Now
apply another bead of silicone around this joint
and smooth out. Then use a Z-Flex locking band
around the center of the joint.
Z-Flex Z-Vent Size Lockinq Band Part #
3" #02SVSLBX03
4" #02SVSLBX04
1) Apply the high temperature silicone
approximately one inch from the end, around
the male end of the pipe in an even 1/4" bead.
2) Pipes can now be pushed together as far
as they will go. The seams on pipe should
be aligned and oriented upward in all
horizontal appliances. Apply another bead
of silicone around this joint and smooth
out.3) Slide locking band over center of joint
and tighten gear clamps. Make sure locking
band is centered on joint.
4) Check all joints and seams for gas tightness.
5) Horizontal venting shall have a slope not
less than 1/4" (6.4mm) every 12 inches
(305mm) downward away from the boiler
to prevent collection of condensate
throughout the assembly.
6) Allow the sealant to cure for 24 hours before
operating the appliance.