Viessmann Vitodens 200-W WB2B Series Installation Instructions Manual page 34

Direct Venting (Two-pipe System)
Vent Requirements - Stainless Steel
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
Viessmann WB1B 26, 35
WB2B 19, 26, 35
B2TA 19, 35
B2TB 19, 35
B2HA 19, 28, 35
B2HB 19, 26, 35
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).
Vent pipe starter adaptors for WB1B 26, 35,
WB2B 19, 26, 35, B2TA 19, 35 and B2HA 19, 28, 35
A
Air inlet (intake)
cover must stay
in place.
DO NOT remove!
34
Vitodens Rigid and Flex Venting Systems Installation
(continued)
PP(s) increaser
(60 to 80 mm) (see
illustration above
Optional left
connection
for air intake
B
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)
CVPC Starter Adaptor for air intake
2 in.
Flue
Air
Quantity
1