Vent Requirements - Cpvc; Additional Requirements For Cpvc Vent Pipe Material; Exhaust Vent Pipe Connection To Boiler; Required Starter Adaptors And Mesh Screen For Cpvc System - Viessmann Vitocrossal 300 CU3A Installation Instructions Manual

Single Pipe Venting (Room Air Dependent)

Vent Requirements - CPVC

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 Vitocrossal 300
CU3A boilers.
Prior to installation, check that the correct single-pipe vent
parts have been ordered and supplied.
See table for special starter adaptor and bird screen
models required for your installation.
Exhaust vent connection to boiler
The vent connection to the Vitocrossal 300 CU3A boiler
must be made with CPVC starter adaptors (see table).
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 3 in. and 4 in.
48
CU3A Venting Systems Installation
Required starter adaptors and mesh screen for CPVC
system
Part Boiler
CPVC CU3A 26, 35
Starter Adaptor CU3A 45, 57
Wire Mesh CU3A 26, 35
Screen for CU3A 45, 57
Termination
Elbows/Coupling
WARNING
The use of vent material other than materials approved
for, positive pressure vent pipe and fittings can cause
property damage, severe personal injury and/or loss of life.
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 (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.
Size Supplier Qty
3 in.
Viessmann 1
4 in.
3 in.
Viessmann 1
4 in.