22
ALTA
Combi Installation, Operating & Service Instructions
110327-07 - 2/23
7
General Venting
(continued)
Polypropylene Venting
WARNING
Asphyxiation Hazard.
• Use only vent materials listed in Table 7-16
to make vent connections. Consult vent
manufacturer's instructions for required support
and special connections.
• Follow vent manufacturer's instructions
supplied with vent system.
• Do not mix vent systems of different types or
manufacturers.
• Maintain clearances to vent piping per Figure
5-1.
• Failure to comply with venting instructions
could cause products of combustion and/or
carbon monoxide to enter the building, resulting
in severe personal injury, death or substantial
property damage.
!
NOTICE:
Polypropylene vent connections
must be secured by vent manufacturer's joint
connector.
1. Slope polypropylene vent pipe not less than
5/8 in. per ft. (52 mm per m) upwards from
boiler to vent terminal for condensate drainage.
2. Support polypropylene venting per vent
manufacturer's instructions.
3. Examine all components for possible shipping
damage prior to installation.
WARNING
Asphyxiation Hazard.
All polypropylene vent systems rely on gaskets
for sealing. Ensure gaskets are installed in
each female end of vent pipe or fitting. Failure
to make proper joint connections could
cause products of combustion and/or carbon
monoxide to enter the building, resulting in
severe personal injury, death or substantial
property damage.
!
4. Work from boiler towards vent or air
termination. Do not exceed maximum
equivalent lengths shown in Table 7-7.
See Table 7-9 for equivalent lengths of elbows
and fittings.
5. Only cut polypropylene vent pipe as permitted
by vent manufacturer and in accordance with
their instructions. Ensure cut end is square and
deburred prior to assembly.
6. Boiler vent connector is gasketed. Lubricate
gasket with soapy water, insert pipe until it
bottoms out, and tighten clamp. See Figure
7-18.
7. Assemble remainder of vent system in
accordance with vent manufacturer's instruction
being sure to provide for thermal expansion.
Clamp sections together as directed by vent
manufacturer.
8. All air piping may be PVC or polypropylene.
PVC to polypropylene adapter required at boiler
connection if using polypropylene air piping.
9. Vent and air can be up-sized to 3 in. for
longer runs. Requires 2 x 3 in. polypropylene
increaser. Vent increaser must be directly
attached to boiler vent connector and must
be installed in vertical section of pipe. If using
polypropylene air piping, increaser must be
directly attached to PVC to polypropylene adapter
and must be installed in vertical section of pipe.
See Figure 7-19.
10. If using flexible polypropylene:
A. Maximum length of corrugated flexible
venting will be reduced vs. rigid pipe
due to higher pressure drop of flexible
venting. See Table 7-10.
B. Store vent material in ambient space 41°F
(5°C) or warmer before beginning installation.
Observe vent manufacturer's instructions for
storing and handling this pipe.
C. Use only in vertical or near vertical
installations with bends no greater than 45°.
Maximum two offsets (four bends).
Manufacturer Model
DuraVent
Polypropylene Single Wall Rigid
PolyPro Flex
Centrotherm
InnoFlue Single Wall Rigid
InnoFlue Flex
Selkirk
PolyFlue Single Wall Rigid
PolyFlue Single Wall Flex
Table 7-16: Listed Polypropylene Vent Materials
(ULC-S636 Listed)
