Viessmann Vitocal 300-G Installation And Service Instructions Manual page 29

Preparing for installation
Primary circuit, type WW 301.A + BWS 301.A...
(cont.)
Hydraulic installation scheme
16
--F2--
21
20
--F3--
17
22
23
15
24
--2/X3.8;3.9--
19
9 1
---------
27 26 28 2
29