Viessmann Vitocal 300-G Installation And Service Instructions For Contractors page 20

Preparing for installation
Primary circuit, type BW + BWS (two-stage)
Electrical installation scheme
Overview of electrical connections and
details regarding the PCBs, see from
page 67 and the separate service
instructions, Vitotronic 200 heat pump
control unit.
sYYA .
X1.
?
X2.N
X1.
?
X2.N
X3.9
X1.
?
X3.8
With a common primary pump
Note
If heat pumps stage 1 and 2 (types BW
and BWS) are installed with different
rated outputs, the different flow rates
mean that two primary pumps must be
used (see page 19).
20
2
sXVS .
[G
X
[G
X
(cont.)
200 W
M
1~
200 W
M
1~
230 V; 0.15 A wQ
P
Pt 500
12
Pt 500
13
UP
qT
UP
wT
qZ
qU