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Direct Venting (Two-pipe System)
Vent Requirements - CPVC
Additional requirements for UL/ULC-listed CPVC vent pipe material
Use UL/ULC-listed special plastic pipe
(CPVC) for horizontal (side wall) or
vertical (roof) venting of the Vitodens
boilers.
See table 34. below and contact
Viessmann to order.
Prior to installation, check that the
correct single-wall vent parts were
ordered and supplied.
See table 34. for special parallel/starter
adaptor and bird screen models
required for your installation. In case of
discrepancies, contact Viessmann.
Exhaust vent/air intake connection to
boiler
The vent connection to the Vitodens
boiler must be made with a parallel
adaptor (available from Viessmann -
see table 34.) and the CPVC starter
adaptors (see table 34.). The starter
adaptors are intended for a slip fit and
slide into the parallel adaptor with a
gentle twisting motion.
For vent/air intake pipe system, two
wire mesh screens (bird screen) must
be ordered from Viessmann. These
parts are available in pre-cut diameters
of 2", 3" and 4" (see table 34.).
Table 34. Required parallel and starter adaptors for CPVC system
Part
Parallel Pipe Adaptor
CPVC Starter Adaptor
Wire Mesh Screen
for Termination
Elbows/Coupling
*1
See Fig. 38 on page 49.
*2
See Fig. 39 on page 49.
*3
See Fig. 40 on page 49.
48
Note:
The Vitodens boiler has passed the
zero inches vent clearance to
combustibles testing requirements
dictated by the Harmonized Standard
ANSI Z21.13. CSA 4.9.2005 and
therefore is listed for zero clearance to
combustibles when vented with a
single wall special venting system
(CPVC material). The zero inches vent
clearance to combustibles for the
Vitodens boiler supercedes the
clearance to combustibles listing that
appears on the special venting system
marking label.
Approved vent pipe material
Fig. 37
Boiler Model
HWB1A 8-24, 8-30
HWB2 6-24C, 6-24, 8-32
HWB2 11-44, 15-60
HWB1A 8-24, 8-30
HWB2 6-24C, 6-24, 8-32
HWB2 11-44, 15-60
HWB1A 8-24, 8-30
HWB2 6-24C, 6-24, 8-32
HWB2 11-44, 15-60
Part Number
*1
3"
7186032
*2
3"
7189822
*3
4"
7189823
*1
3"
7134770
*2
3"
7134770
*3
4"
7134771
3"
7134781
3"
7134781
4"
7134782
IMPORTANT
For exhaust vent pipe material:
Do not use any other vent material.
Do not use galvanized pipe, plastic pipe
and/or chimney liners (rigid or flexible)
of any kind.
WARNING
The use of vent material other than
listed CPVC, positive pressure vent
pipe and fittings can cause property
damage, severe personal injury and/or
loss of life.
Supplier
Viessmann
Viessmann
Viessmann
Qty.
1
1
1
2
2
2
2
2
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