General Installation Examples - Viessmann Vitocrossal 300 CU3A Installation Instructions Manual

CU3A Venting Systems Installation
Vertical Venting Layouts

General installation examples

Sloped roof installation
IMPORTANT
Ensure that the venting system is properly supported; the
Vitocrossal 300 CU3A boilers are not designed to support
the weight of the venting system.
(continued)
Note: Depending on the selected vent manufacturer,
Coaxial adaptor installation
Note: This installation procedure is only required for the
1. Remove the inspection port bolt 1 from the top of
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
5. Deburr the edges of the drilled hole.
6. Fully install the coaxial adaptor into the boiler and align
7. Reinstall the inspection port bolt 1 and tighten bolt
Vertical Vent Installation (Coaxial)
Sloped roof installation with offset
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.
CU3A 45, 57 and not for the CU3A 26, 35.
the vent connection (as shown).
f in. hole where marked.
the inspection port hole to the coaxial adaptor hole.
to seal.
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