Vent Requirements - Stainless Steel; Additional Requirements For Stainless Steel Vent Pipe Material; Exhaust Vent/Air Intake Connection To Boiler; Combustion Air Intake Pipe - Viessmann Vitocrossal 300 CU3A Installation Instructions Manual

CU3A Venting Systems Installation

Vent Requirements - Stainless Steel

Additional requirements for stainless steel vent pipe material

Use special stainless steel venting system (UL/ULC listed
for category IV) for horizontal or vertical venting of the
Vitocrossal 300 CU3A boilers.
Contact one of the suppliers (see listing on right) to order.
Prior to installation, check that the correct single-pipe
vent parts were ordered and supplied.
For special parallel/starter adaptor and bird screen models
required for your installation. In case of discrepancies,
contact original parts supplier.

Exhaust vent/air intake connection to boiler

The vent connection to the Vitocrossal 300 CU3A boiler
must be made with the starter stainless steel adaptor
(supplied by others and/or parallel adaptor). The starter
adaptors are intended for a slip fit and slide into the
parallel adaptor with a gentle twisting motion.

Combustion air intake pipe:

If the venting system will use CPVC, ABS or PVC plastic
pipe for combustion air intake, a CPVC starter adaptor
is supplied with the boiler installation fittings for use on
air intake connection to parallel adaptor must be ordered
from Viessmann.
The bird screen for the air intake termination elbow must
also be ordered from Viessmann.
Note: The Vitocrossal 300 CU3A boiler has passed the
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. 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.
Direct Venting (Two-pipe System)

Vent system manufacturers

PolyFlue - Selkirk
www.polyflue.com
ProTech Systems, Inc.
www.protechinfo.com
Security Chimneys
International Ltd.
www.securitychimneys.com
WARNING
The use of vent material other than listed UL/ULC
stainless steel, positive pressure vent pipe and fittings
can cause property damage, severe personal injury
and/or loss of life.
ICC - Industrial Chimney Co.
www.icc-rsf.com
Novaflex
www.novaflex.com
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