Vent Requirements - Cpvc; Additional Requirements For Ul/Ulc-Listed Cpvc Vent Pipe Material; Exhaust Vent/Air Intake Connection To Boiler - Viessmann Vitocrossal 300 CU3A Installation Instructions Manual

Direct Venting (Two-pipe System)

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
Vitocrossal 300 CU3A boilers.
See below and contact Viessmann to order special parts.

Exhaust vent/air intake connection to boiler

The vent connection to the Vitocrossal 300 CU3A boiler
must be made with the CPVC starter adaptor. The starter
adaptors are intended for a slip fit and slide into the boiler
termination 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 3 in. and 4 in.
Required starter adaptors for CPVC system
Part
Flue gas pipe
Wire Mesh Screen for Termination
Elbows/Coupling
The CPVC starter adaptor 3 in. for combustion air is supplied with the boiler installation fittings.
30
Note: The Vitocrossal 300 CU3A boiler has passed the
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.
Boiler Model
CU3A 26, 35
CU3A 45, 57
CU3A 26, 35
CU3A 45, 57
CU3A Venting Systems Installation
zero inches vent clearance to combustibles testing
requirements dictated by the Harmonized Standard
ANSI Z21.13. CSA 4.9 and therefore is listed
for zero clearance to combustibles when vented
with a single pipe special venting system (CPVC
material). The zero inches vent clearance to
combustibles for the Vitocrossal 300 CU3A boiler
supersedes the clearance to combustibles listing
that appears on the special venting system marking
label.
WARNING
Diameter
3 in.
4 in.
3 in.
4 in.
Supplier Quantity
Viessmann 1
1
Viessmann 2
2