Side Wall Venting Layouts; Standard Sidewall Venting Layout With Basic Coaxial Vent Componentry - Viessmann Vitocrossal 300 CU3A Installation Instructions Manual

Side Wall Vent Installation (Coaxial)

Side Wall Venting Layouts

Standard side wall venting layout with basic coaxial vent componentry Standard side wall venting layout with basic coaxial vent componentry
Legend
A Combustion air intake
B Boiler flue termination
C Coaxial adaptor (Centrotherm shown)
D 90° elbow
E Straight pipe (long)
F Telescopic extension
G Straight pipe (short)
H 45° elbow
I Vent termination
J Protective screen (Viessmann)
Note: Depending on the selected vent manufacturer,
a service clearance of 36 in. may be required.
Consult the vent manufacturer if using two-pipe
to coaxial adaptor directly at the back of the boiler.
IMPORTANT
Total length of vent termination pipe may be shortened,
if required. Follow manufacturer's instructions.
WARNING
Protective screen MUST be installed.
14
CU3A Venting Systems Installation
Coaxial adaptor installation
Note: This installation procedure is only required for the
CU3A 45, 57 and not for the CU3A 26, 35.
1. Remove the inspection port bolt 1 from the top of
the vent connection (as shown).
2. Fully insert the coaxial adaptor into the boiler.
3. Mark the center of the inspection port on the adaptor.
4. Remove the coaxial adaptor from the boiler and drill a
f in. hole where marked.
5. Deburr the edges of the drilled hole.
6. Fully install the coaxial adaptor into the boiler and align
the inspection port hole to the coaxial adaptor hole.
7. Reinstall the inspection port bolt 1 and tighten bolt
to seal.
The Vitocrossal 300 CU3A requires a coaxial venting
adaptor. This adaptor must be ordered separately through
the vent manufacturer.
Coaxial venting by manufacturers
Fully coaxial
CU3A 26, 35
Z-FLEX
Centrotherm
ECCO
M&G
Coaxial termination (only)
CU3A 26, 35
PolyFlue* 80/125 (vert.)
* refer to two-pipe venting section page 39.
CU3A 45, 57
80/125 110/160
80/125 110/160
80/125 110/160
80/125 100/150
CU3A 45, 57
100/150 (horiz.)