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5608 741 - 04
Vitodens Rigid and Flex Venting Systems Installation
Vent Requirements - Stainless Steel
(continued)
Direct Venting (Two-pipe System)
Additional requirements for stainless steel vent pipe
material
(continued)
Viessmann single pipe PP(s) increaser and 2 in. air intake
CPVC adaptor (if using ABS/CPVC/PVC material) must be
ordered, (see table below for part number).
Minimum pipe diameter available for exhaust stainless
steel pipe is 3 in.
The air inlet (intake) cover must stay in place.
Increaser (min. stainless steel pipe diameter is 3 in. (76 mm)
Supplier
Boiler Model
PP(s) increaser
CVPC Starter Adaptor for air intake
Quantity
Viessmann
WB1B 26, 35
WB2B 19, 26, 35
B2TA 19, 35
B2TB 19, 35
B2HA 19, 28, 35
B2HB 19, 26, 35
(60 to 80 mm) (see
illustration above
2 in.
1
WARNING
(For this type of installation only:)
Boiler comes with pre-installed combustion air cover
mounted on the concentric vent pipe adaptor. Do not
remove combustion air intake cover. Removing this cover
may cause unintended room air dependent operation
(non-direct vent). Room air dependent operation requires
provision of combustion and ventilation air (as per
section “Single Pipe Venting”, page 53).
Air inlet (intake)
cover must stay
in place.
DO NOT remove!
A
B
Vent pipe starter adaptors for WB1B 26, 35,
WB2B 19, 26, 35, B2TA 19, 35 and B2HA 19, 28, 35
Air
Flue
Optional left
connection
for air intake
Legend
A
Stainless steel slip joint vent starter adaptor
B
2 in. CVPC starter adaptor
a 3 in. (76 mm)
b 2 in. (51 mm)
c 6.25 in. (159 mm)
d 10.34 in. (263 mm)
e 3 in. (76 mm)