58
|
City Series CV72E
installation
plumber's
tape
connected
to wall strap
Ruban de
plombier
relié à
l’attache
murale
wall
strap
Attache
murale
45
o
Elbows
Coudes de 45
o
Firestop
Spacer
Espaceur
coupe-feu
walstrp.eps
walstrpf.eps
french
6)
Continue to assemble pipe lengths.
Note: If an offset is necessary in the attic
to avoid obstructions, it is important
to support the vent pipe every 3
feet (0.9 meter), to avoid excessive
stress on the elbows, and possible
separation. Wall straps are available
for this purpose
(Diagram 2).
Galvanized pipe is desirable above the roofline
due to its higher corrosion resistance. Continue
to add pipe sections through the flashing until
the height of the vent cap meets the minimum
height requirements specified in Diagram 5 or
local codes. Note that for steep roof pitches, the
vertical height must be increased.
Diagram 3
Note:
For best results and optimum performance
with each approved venting system, it is highly
recommended to apply “Mill-Pac” sealant to
every inner pipe connection. Failure to do so
may result in drafting or performance issues
not covered under warranty.
Vertical Termination
(Rigid Vent
Systems)
Note:
A top clearance of 3"(76mm) and
side bottom clearance of 2" (51mm)
must be maintained; except when
passing through a wall, ceiling, or at
the termination where the use of a
firestop or wall thimble reduces the
required clearance to 1-1/2" (38mm).
We recommend framing a 11"(279mm)
x 11"(279mm) (inside dimensions) hole
to give structural rigidity for mounting
the termination.
1)
Maintain the 1-1/2" (38mm) clearances (air
spaces) t o c o m bu s t i bl e s w h e n passing
through ceilings, walls,
roofs, enclosures, attic
rafter, or other nearby
combustible surfaces,
ensuring that the use of
a firestop or wall thimble
is used as noted above.
Do not pack air spaces
with insulation. Check
"Venting Arrangement
- Vertical Termination"
s e c t i o n f o r t h e
maximum vertical rise
of the venting system and
the maximum horizontal
offset limitations.
2)
Set the gas appliance
in its desired location. Drop
a
p l u m b b o b d ow n
from the ceiling to
the position of the
appliance flue exit,
and mark the location
where the vent will
penetrate the ceiling.
Drill a small hole at
his point. Next, drop a
plumb bob from the roof
to the hole previously
drilled in the ceiling,
and mark the spot
where the vent will
penetrate the roof.
Determine if ceiling joists, roof rafters or other
framing will obstruct the venting system. You may
wish to relocate the appliance or to offset, as
shown in Diagram 2 to avoid cutting load bearing
members.
3)
A Firestop spacer must be installed in the floor
or ceiling of every level.
4)
Assemble the desired lengths of pipe and elbows.
Ensure that all pipes and elbow connections are
in the fully twist-locked position and sealed.
Diagram 4: The upper half of the flashing is
installed under the roofing material and not
nailed down until the chimney is installed. This
allows for small adjustments.
5)
Cut a hole in the roof centered on the small
drilled hole placed in the roof in Step 2. The hole
should be of sufficient size to meet the minimum
requirements for clearance to combustibles of
1-1/2"(38mm). Slip the flashing under the shingles
(shingles should overlap half the flashing) as per
Diagram 4.
Offset Chart
A poor draft, or down drafting can result from high
wind conditions near big trees or adjoining roof
lines, in these cases, increasing the vent height
may solve the problem.
7)
Ensure vent is vertical and secure the base of
the flashing to the roof with roofing rails, slide
storm collar over the pipe section and seal with
a mastic.
8)
Install the vertical termination cap by twist-
locking it.
Note: Any closets or storage spaces,
which the vent passes through must
be enclosed.
Diagram 5
Roof Pitch
Minimum Vent
Height
Feet
Meters
flat to 7/12
2
0.61
over 7/12 to 8/12
2
0.61
over 8/12 to 9/12
2
0.61
over 9/12 to 10/12
2.5
0.76
over 10/12 to 11/12
3.25
0.99
over 11/12 to 12/12
4
1.22
over 12/12 to 14/12
5
1.52
over 14/12 to 16/12
6
1.83
over 16/12 to 18/12
7
2.13
over 18/12 to 20/12
7.5
2.29
over 20/12 to 21/12
8
2.44
Diagram 1
Diagram 2
Summary of Contents for City Series
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