18
110332-02 - 6/22
PHTM II
Installation, Operating & Service Instructions
7
General Venting
(continued)
6. CPVC/PVC vent starter kits are available. Kits
include 30 in. (760 mm) CPVC pipe, 90° short
CPVC elbow, PVC coupling (vent terminal), 90°
short PVC elbow (air terminal), and 2 terminal
screens. Components in these kits are not
ULC-S636 listed and are therefore not usable in
Canada.
A. 2 in. kit: 107039-01
B. 3 in. kit: 107039-02
7. Allow for 3/8 in. (9.5 mm) of thermal
expansion per 10 ft. (3.0 m) of CPVC/PVC pipe. If
a straight run of pipe exceeds 20 ft. (6.0 m) and
is restrained at both ends, an offset or expansion
loop is required per Figure 7-15. If a straight
horizontal run of pipe exceeds 20 ft. (6.0 m) and
is restrained at one end with an elbow at the other,
ensure hanger or guide is not less than Y in from
elbow per Figure 7-15. Thermal expansion fittings
not permitted.
8. All air piping may be PVC.
9. Vent and air can be up-sized to 3 in. for
longer runs. If upsizing to 3 in. vent material, the
following is required:
A. 2 in. CPVC vent piece (max 12 in. 305 mm)
(field supplied).
B. 2 in. x 3 in. CPVC increaser (field supplied,
Lasco 9829-338, Spears 829-338C or IPEX
9829338 or equivalent).
C. 3 in CPVC/PVC vent starter kit (purchased
separately, see above).
D. Similar PVC fittings for air intake.
NOTICE:
Increaser must be installed in vertical
section of pipe. See Figure 7-13.
10. Cut pipe squarely and debur inside and
outside of pipe ends after cutting.
11. Dry fit all vent and air components before
cementing any joints.
12. Use field supplied primer and cement
appropriate for materials being joined. Follow
primer and cement instructions to join pipe
and fittings.
13. Clean all pipe ends and fittings with
appropriate primer before cement. Apply
primer to both pipe and fitting socket before
applying cement.
14. Boiler vent connector is gasketed. Lubricate
gasket with soapy water, insert pipe until it
bottoms out, and tighten clamp.
15. Boiler air connector in PVC socket fitting. Drill
7/32 in. (5.5 mm) hole in air connector. Drill
1/8 in. (3.2 mm) hole in air pipe to align with hole
At least 30in. (760mm)
of CPVC pipe and one
CPVC elbow required
between boiler and PVC
vent piping.
PVC coupling may
be used to join CPVC
to PVC vent pipe.
Clamp
To vent
termination
From air
termination
Max. 12in. (305mm)
2in. CPVC pipe
3in. X 2in. CPVC
Increaser
At least 30in. (760mm) of
CPVC pipe and one CPVC
elbow required between
boiler and PVC vent piping.
PVC coupling may
be used to join CPVC
to PVC vent piping.
3in. X 2in. PVC
Increaser
Clamp
Max. 12in. (305mm)
2in. PVC pipe
To vent
termination
From air
termination
Figure 7-12: Near Boiler CPVC/PVC Venting
Figure 7-13: Near Boiler CPVC/PVC Venting with
Increaser
Note: Length of 2 in. pipe is counted toward 30 in.
CPVC requirement.
in connector. Insert pipe into air connector and
use #10 x 1 in. sheet metal screw to secure. Seal
joint between air connector and pipe with RTV
silicone.
16. To the extent possible, slope horizontal air
piping towards outdoors.