Viessmann Vitocal 300-G Installation And Service Instructions For Contractors page 27

Primary circuit, type WW + BWS (two-stage)
Connecting the sensors and limiters
2
X3.3
X1.
?
X3.4
X3.8
X1.
?
X3.9
[G
X
[G
X
With a common primary pump
Note
If heat pumps stage 1 and 2 (types WW
and BWS) are installed with different
rated outputs, the different flow rates
mean that two primary pumps must be
used (see page 23).
230 V; 2 mA
´
230 V; 0.15 A wQ
P
230 V; 0.15 A qO
Pt 500
12
Pt 500
13
Preparing for installation
(cont.)
wE
qZ
qU
27