AO Smith POWER VENT GAS Manuel D'installation Et D'utilisation page 24

INSTALLATION OF VERTICAL VENT SYSTEM
A proper fl ashing or "BOOT" should be used to seal the
pipe where it exits the roof. The total vent system should
not exceed the equivalent feet of pipe as listed in Table
1.
Provide support for all pipe protruding through the roof.
All piping should be properly secured. The vent system
piping should be supported every 1.5m (5 ft.) of vertical
run and every 910mm (3 ft.) of horizontal run. All piping
and fi ttings must be joined by the proper procedures as
described under: VENT PIPE PREPARATION.
FIGURE 28
76mm (3 in.)
MIN. LENGTH
A VENT USED IN A SPECIAL
VENTING SYSTEM WITH POSITIVE
VENT PRESSURE AND PASSING
T H R O U G H A R O O F S H A L L
EXTEND AT LEAST 450mm (18
in.) ABOVE THE HIGHEST POINT
WHERE IT PASSES THROUGH
THE ROOF SURFACE AND ANY
OTHER OBSTRUCTION WITHIN
A HORIZONTAL DISTANCE OF
450mm (18 in.). A VERTICAL
VENTING SYSTEM MUST BE
SUPPORTED EVERY 1.5m (5 ft.).
FIGURE 29
24
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TERMINATION
MAY BE 45°
ELBOW OR A
"T" ELBOW
RODENT
SCREEN
450mm
(INSTALL
(18 in.)
INTO
ELBOW)
ROOF
LINE
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CONNECTION TO VENT PIPE
The vent system connects to the vent pipe with and elbow
or rubber coupling. This coupling includes gear clamps.
These connections must be properly seated and tightened
to prevent the leakage of fl ue gases into the installation
area.
With 2 in. venting the straight rubber adapter is used for the
connection to the vent pipe. With 3 in. venting a transition
adapter is required to change from the 2 in. vent pipe to
the 3 in. vent size.
Clean and lightly sand the end of the vent piping that will
connect to the rubber coupling.
Loosen the upper clamp on the rubber adapter and insert
the sanded end of the vent pipe and tighten the gear
clamp.
NOTE: Do not glue or seal in the rubber coupling. Check
the venting system to ensure that there is no stress on the
connection or the vent pipe which will create a twisting or
bending.
UPPER GEAR
GEAR CLAMP
RUBBER COUPLING/
ADAPTER (2")
FIGURE 30
CLAMP
LOWER
RUBBER ADAPTER (2 in.to
3")
316888-001 Rev. 00 dRaFt Jun 28 245