Viessmann Vitocal 252-A Series - Page 59

59
The two connections from and to the outdoor unit are
hydraulically connected for this purpose. It is essential
to install an air vent valve and a non-return valve in
this connection line: See the following illustration.
A
B
Fig. 43
A
Air vent valve
B
Non-return valve
Hydraulic connections
Hydraulic connection of the indoor unit (cont.)
6222080
Installation