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POLYPROPYLENE VENT SYSTEMS
Polypropylene vent systems do not use cement to connect
the pipe and elbow sections but use a push together gasket
seal method. Do not attempt to connect polypropylene
with sealant cement.
•
Polypropylene vent systems are designed to use
specific adaptors to connect into the rubber coupling
on the top of the blower. These are available through
your venting supplier.
•
The PVC vent termination elbow supplied with this
heater has been certified to be used with polypropylene
vent systems. A polypropylene to PVC end connection
is required and is available through your venting
supplier.
•
Optional wall plates that fit the polypropylene venting
are also available through your supplier.
1. Carefully inspect the entire venting system for any
signs of cracks or fractures, particularly at joints
between elbows and other fittings and straight runs
of vent pipe.
2. Check system for signs of sagging or other stresses in
joints as a result of misalignment of any components
in the system. If any of these conditions are found,
they must be corrected in accordance with the
venting instructions elsewhere in this manual before
completing installation and putting the water heater
into service.
3. The vent piping shall be connected to the blower with
the rubber coupling and secured with gear clamps.
The coupling and clamps are provided with the heater.
4. Even though the flue gas temperature leaving the
blower is hot, some installations will have water
condense in the vent piping. If this occurs, then
adequate means of draining and disposing of the
condensate shall be made by the installer.
34
VENT PIPE LENGTH AND SIZING
Refer to Table 7 and Table 8 for vent pipe sizing. If the
installation requires a vent riser, suitable drainage must
be provided to ensure condensation does not accumulate
(see Figure 48). The specified maximum lengths are for
each of the intake and exhaust systems and not for the
combined lengths of both systems. Minimum pipe length
is 2' with a minimum of one 90° elbow per side (intake
and exhaust).
1. Determine termination type and pipe size.
2. Determine number of elbows in vent system. Do not
include termination elbow. Calculate the maximum
equivalent length of the exhaust and air intake system
using Table 6 to determine equivalent length values.
90° SHORT SWEEP ELBOW
(MORE RESTRICTIVE)
Elbow Type
90°
45°
www. lochinvar .com
90° LONG SWEEP ELBOW
(LESS RESTRICTIVE)
Figure 38.
Equivalent Length Of Straight Pipe
Short Sweep/
Long Sweep/
Radius
8'
4'
Table 6.
100304522_2000545236 _Rev. 02
Radius
5'
2.5'
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