Integration Of The Two-Stage Version In The System Examples - Viessmann VITOCAL 300-G Installation And Service Instructions Manual

Primary circuit, type WW + WWS (two-stage...
Connecting the sensors and limiters
2
X3.3
X1.
?
X3.4
X3.8
X1.
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X3.9
[G
X
[G
X

Integration of the two-stage version in the system examples

Note
■ Every partial scheme can be integra-
ted into the system examples via the
interfaces indicated.
■ Connect return DHW cylinder only to
heat pump, type BW.
■ Two-stage heat pump cascade:
For the two-stage heat pump cascade,
the lead appliance and lag heat pumps
each comprise a heat pump (type BW)
and heat pump stage 2 (type BWS).
The electrical connection is made at
the heat pump (type BW) (via the KM
BUS at external extension H1) as per
page 100.
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
39