Viessmann Vitocal 300-G Installation And Service Instructions Manual page 21

Preparing for installation
Primary circuit, type BW 301.A + BWS 301.A...
(cont.)
With a common primary pump
Note
If heat pumps stage 1 and 2 (types BW
301.A + BWS 301.A) are installed with
different rated heating outputs, the dif-
ferent flow rates mean that two primary
pumps must be used (see page 19).
Hydraulic installation scheme
16
21
--F2--
--2/X3.8;3.9--
20
--F3--
17
22
15
27
9 1
2
21