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Single Wall Venting (Room Air Dependent)
General Installation Information
Additional requirements for 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 45. below and contact
Viessmann to order.
Prior to installation, check that the
correct single-wall vent parts have
been ordered and supplied.
See table 45. for special starter
adaptor and bird screen models
required for your installation.
Exhaust vent connection to boiler
The vent connection to the Vitodens
boiler must be made with CPVC starter
adaptors (see table 45.). The starter
adaptors are intended for a slip fit and
slide into the boiler adaptor with a
gentle twisting motion.
For a vent pipe system, one wire mesh
screen (bird screen) must be ordered
from Viessmann. These parts are
available in pre-cut diameters of 2", 3"
and 4" (see table 45.).
Table 45. Required starter adaptors and mesh screen for CPVC system
Part
CPVC Starter Adaptor
Wire Mesh Screen
for Termination
Elbows/Coupling
*1
See Fig. 56.
68
(continued)
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. 55
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
Part Number
*1
2"
7134769
*1
3"
7134770
*1
4"
7134771
2"
7134780
3"
7134781
4"
7134782
Fig. 56
IMPORTANT
For exhaust vent pipe material:
Do not use any other vent material.
Do not use galvanized pipe, plastic pipe
and/or chimney liners 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
Qty.
1
1
1
1
1
1
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