Installation guide

Single Wall Venting (Room Air Dependent)
75
General Installation Information (continued)
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 49 below and contact
Viessmann to order.
Prior to installation, check that the
correct single-wall vent parts have
been ordered and supplied.
See table 49 for special starter adaptor
and bird screen models required f or
your installation.
Exhaust vent connection to boiler
The vent connection to the Vitodens
boiler must be made with CPVC starter
adaptors (see table 49.). 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 49).
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 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 of any kind.
Table 49. Required starter adaptors and mesh screen for CPVC system
Part
Boiler Model Size Supplier Qty.
CPVC Starter Adaptor H WB1B 10-29, 10-35
WB2B 9-19/26/35
H WB2B 17-45, 17-60
H WB2B 30-80, 30-105
2”
3”
4”
Viessmann 1
Wire Mesh Screen
for Termination
Elbows/Coupling
H WB1B 10-29, 10-35
WB2B 9-19/26/35
H WB2B 17-45, 17-60
H WB2B 30-80, 30-105
2”
3”
4”
Viessmann 1
5368 815 v2.0 b
Fig. 65
Marking
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
Combustion
air inlet
A
Fig. 66
A Annular air gap
WB2B 17-45/60 and
WB2B 30-80/105
Fig. 67
Remove and
discard
air inlet cover
if used for
combustion air
intake.
Remove and
discard air inlet
cover if using
annular air gap.
B
A
B
A Annular air gap
B Optional opening for combustion air intake.
Remove and discard cover.
WB1B 10-29/35 and WB2B 9-19/26/35