Before Set-Up; Minimum Clearances; Recommended Minimum Service Clearances - Viessmann Vitocrossal 300 CU3A 26 Installation Instructions Manual

Set-up

Before Set-up

Minimum Clearances

Recommended minimum service clearances

For typical Vitocrossal CU3A series boiler installations,
Viessmann recommends installing the boiler with the
service clearances shown in the illustration.
Minimum clearances to combustibles
Boiler model CU3A
Top
Sides (left and right)
Vent pipe
Front (alcove or closet)
Rear
Floor
The Vitocrossal CU3A series boilers are approved for closet and alcove installation with the clearances to combustibles listed.
*1 Clearance between boilers may be reduced to zero
in multi-boiler installations.
Note: The burner, boiler control, condensate trap,
venting and heat exchanger are still fully
accessible from the front and rear of the boiler.
10
1*
26, 94
0
0
0
0
0
combustible combustible
Vitocrossal 300 CU3A 26 to 199 Installation
Before placing boiler in its installation location, ensure all
necessary accessories are installed.
CAUTION
The boiler must be installed in such a way that gas
ignition system components are protected from water
(spraying, splashing, etc.) during boiler operation and
service.
Note: The Vitocrossal 300 CU3A series boiler conforms
to the zero inches vent clearance to combustibles
testing requirements dictated by the boiler
Harmonized Standard ANSI Z21.13. CSA/4.9
(latest edition) and therefore is listed for zero
clearance to combustibles when vented with a
single-wall UL/ULC certified special venting system.
The zero inches vent clearance to combustibles for
the Vitocrossal 300 CU3A boiler supercedes the
clearance to combustibles listing that appears
on the special venting system label.
The back or side clearance shall be increased if
piping installation is required.
See the Vitocrossal 300 CU3A Venting
System Installation Instructions for details.
35, 125 45, 160
0
0
0
0
0
combustible
57, 199
0 0
0 0
0 0
0 0
0 0
combustible