18
3
General
venting
PVC/CPVC:
DIR #2000528318 00
VENT
AIR
Figure 3-7 Near Boiler PVC/CPVC Venting
When transitioning from 2" to 3" vent diameter,
a 2" pipe section and 2" to 3" increaser are
required to be CPVC when PVC/CPVC vent
is used.
WARNING
Examples:
1. Seven (7) feet vertical
2. Con 90° elbow + 2 feet horizontal
3. One (1) foot ve 90° elbow + 1 foot
horizontal
Installing vent and air piping
Use only cleaners, primers, and solvents that
are approved for the materials which are joined
together.
NOTICE
1. Work from the boiler to vent or air termination. Do not
exceed the lengths given in this manual for the air or vent
piping.
2. Cut pipe to the required lengths and deburr the inside
and outside of the pipe ends.
3. Chamfer outside of each pipe end to ensure even
cement distribution when joining.
4. Clean all pipe ends and fittings using a clean dry rag.
(Moisture will retard curing and dirt or grease will
prevent
adhesion.)
5. Dry fit vent or air piping to ensure proper fit up before
assembling any joint. The pipe should go a third to
two-thirds into the fitting to ensure proper sealing after
cement is applied.
6. Priming
and
Cementing:
a. Handle fittings and pipes carefully to prevent
contamination
of
surfaces.
b. Apply a liberal even coat of primer to the fitting
socket and to the pipe end to approximately 1/2"
beyond the socket depth.
c. Apply a second primer coat to the fitting socket.
d. While primer is still wet, apply an even coat of
approved cement to the pipe equal to the depth of
the fitting socket along with an even coat of
approved cement to the fitting socket.
e. Apply a second coat of cement to the pipe.
f.
While the cement is still wet, insert the pipe into
the fitting, if possible twist the pipe a 1/4 turn as
you insert it.
NOTE:
If voids are present,
sufficient cement was not applied and joint could
be
defective.
g. Wipe excess cement from the joint removing ring
or beads as it will needlessly soften the pipe.
Table 3D PVC/CPVC Vent Pipe, and Fittings
All PVC vent pipes must be glued, properly
supported, and the exhaust must be pitched
a minimum of a 1/4 inch per foot back to the
boiler (to allow drainage of condensate).
NOTICE
WARNING
The flue pipe adapter acts as the CPVC starter
pipe section provided with the appliance if
PVC/CPVC vent is to be used (FIG. 3-7). The
field provided vent fittings must be cemented to
the CPVC pipe section using an “All Purpose
Cement” suitable for PVC and CPVC pipe.
Use only the vent materials, primer, and
cement specified in Table 3D to make the vent
connections. Failure to follow this warning
could result in fire, personal injury, or death.
WARNING
Insulation should not be used on PVC or CPVC
venting materials. The use of insulation will
cause increased vent wall temperatures, which
could result in vent pipe failure.
Approved PVC/CPVC Vent Pipe and Fittings
Item
Material
Standard
Vent pipe
PVC Schedule 40, 80
ANSI/ASTM D1785
PVC - DWV
ANSI/ASTM D2665
CPVC Schedule 40, 80
ANSI/ASTM F441
Vent fittings
PVC Schedule 40
ANSI/ASTM D2466
PVC Schedule 80
ANSI/ASTM D2467
CPVC Schedule 80
ANSI/ASTM F439
Pipe Cement /
Primer
PVC
ANSI/ASTM D2564
CPVC
ANSI/ASTM F493
NOTICE: DO NOT USE CELLULAR (FOAM) CORE PIPE
This product has been approved for use with the PVC/CPVC
vent materials listed in Table 3D.
NOTE:
In Canada, CPVC and PVC vent pipe, fi ttings and cement/
primer must be ULC-S636 certifi ed.
For installations using 2" vent, the first seven
(7) equivalent feet of vent must be CPVC (field
supplied).
See examples below.
WARNING
Installation & Service Manual
F I R E T U B E C O M B I
™
