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3" (76ram)
MtN. LENGTH
A VENT USED tN A SPECIAL
VENTING SYSTEM WITH
POSITIVE VENT PRESSURE
AND PASSING THROUGH
A ROOF SHALL EXTEND
AT LEAST 18" (457mm)
ABOVE THE HIGHEST
POINT WHERE tT PASSES
THROUGH THE ROOF
SURFACE AND ANY OTHER
OBSTRUCTION WITHIN A
HORIZONTAL DISTANCE OF
18" (457rnm). A VERTICAL
VENTING SYSTEM MUST
BE SUPPORTED EVERY 5
ft. (1.5m).
OR ABOVE
ANTICIPATED
SNOW LEVEL
TERMINATION
MAY BE 90 °
RODENT
SCREEN
(iNSTALL
INTO
ELBOW)
ROOF
Figure 32
Vent Pipe Connection To Blower
1. The plastic vent piping connects into the rubber
coupling located on the top of the blower
assembly. This coupling includes gear clamps
to connect the venting to the blower. These
connections must be properly seated and
tightened to prevent the leakage of flue gases
into the area. See Figures 33-36.
2. The 40 and 50-gallon heaters with rated inputs
of 50k Btu/hr or less are designed and supplied
with a 2" (51 mm) rubber coupling to accept the
vent pipe.
NOTE: Polypropylene vent systems require an
additional adaptor.
3. Before installing clean and lightly sand the
end of the PVC/CPVC plastic vent piping
that will connect into the rubber coupling.
For polypropylene vent systems follow
manufacturer's instructions.
4. Loosen the upper clamp on the rubber coupling
and insert the sanded end of the vent piping a
full 1-1/4" (32mm). Do not use glue or sealant
in the rubber coupling. Check that there is no
stress on the connection or the vent piping that
may be caused by twisting or bending.
5. Tighten the upper clamp so that the vent piping
is firmly secured in the coupling and is gas tight.
Do not over tighten or cause distortion of any
of the parts. Ensure the bottom of the rubber
coupling is firmly seated on the blower outlet and
that the lower gear clamp is also secure. Check
to ensure there is no distortion or movement of
the clamped assembly once it is completed.
Property Damage Hazard
• Do not overtighten the top and bottom gear clamps of the
rubber coupling.
• Do not apply solvent cement or silicone to the rubber
coupling connection.
Different Coupling Installations According
To Vent Sizes
CONFIGURATION FOR 2" VENT
4OAND5OGALLON _ _ PIPE
(LO-INPUT) HEATERS |
CONNECTED TO 2" | UPPER
VENTING. | GEAR
| . /CLAMP
2"RUBBER I"'-
COUPLING _-.._.._. _ 4
(SUPPLtED) f_ ]_'_
Figure 33
3" VENT
PIPE
CONFIGURATION FOR
40AND 50 GALLON
(LO-INPUT) HEATERS
CONNECTED TO 3"
VENTING.
* FOR 3" DIRECT 2" RUBBER
CONNECTION TO THE COUPLING
BLOWER, ORDER (SUPPLIED)
COUPLING Kit#
9008311005
SEE ALSO FIGURE 35).
2"-3"
ADAPTER*
(FIELD
SUPPLIED)
2" VENT PIPE,
75ram (3 in.)
MAX LENGTH
BLOWER
Figure 34
(OPTIONAL 3" VENT
CONFIGURATION J PIPE
FOR 40 AND 50
GALLON (LO-INPUT)
HEATERS CONNECTED
DIRECTLY TO 3"
VENTING.
BLOWER
Figure 35
35
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