Installation guide

Direct Venting (Two-pipe System)
52
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 38. below and contact
Viessmann to order.
Prior to installation, check that the
correct single-wall vent parts were
ordered and supplied.
See table 38. for special 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 the starter
stainless steel adaptor (supplied by
others and/or parallel adaptor see table
38). 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 38.).
Note:
The Vitodens boiler has passed the
zero inches vent clearance to
combustibles testing requirements
dictated by the Harmonized Standard
ANSI Z21.13. CSA 4.9.2007 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 supersedes the
clearance to combustibles listing that
appears on the special venting system
marking label.
Approved vent pipe material
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.
Table 38. Required starter adaptors for C PVC system
Part
Boiler Model Diameter Supplier Qty.
Parallel Pipe Adaptor H WB2B 17-45, 17-60
H WB2B 30-80, 30-105
3”
4”
Viessmann 1
1
CPVC Starter Adaptor H WB1B 10-26, 10-35
WB2B 9-19/26/35
H WB2B 17-45, 17-60
H WB2B 30-80, 30-105
2”
*1
3”
*2
4”
*3
Viessmann 2
2
2
2
Wire Mesh Screen
for Termination
Elbows/Coupling
H WB1B 10-26, 10-35
WB2B 9-19/26/35
H WB2B 17-45, 17-60
H WB2B 30-80, 30-105
2”
3” (if used)
4” (if used)
3”
4”
Viessmann 2
2
2
2
2
*1
Seefig.43onpage53.
*2
Seefig.44onpage54.
*3
Seefig.45onpage54.
5368 815 v2.0 b
Fig. 42
IMPORTANT
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.
WARNING