44
C
Interface to the separate cooling
circuit or heating/cooling circuit
H
Interface to the heating circuits
or the heating water buffer cylin-
der
P
Interface to the primary circuit
W
Interface to the DHW cylinder
I
Lead appliance (2-stage) of the
heat pump cascade
II to IV Lag heat pumps 1 to 3, each 2-
stage
Equipment required
Pos.
Description
Heat source
1
Heat pump stage 1
2
Heat pump control unit
3
Outside temperature sensor
5
Circulation pump for cylinder heating (heating water side), heat pump stage
1
6
Secondary pump, heat pump stage 1
9
Heat pump stage 2
qP
Secondary pump, heat pump stage 2
Circulation pump for cylinder heating (heating water side), heat pump stage
2 (optional)
qT
Primary pump, heat pump stage 1
qZ
Primary circuit flow temperature sensor (for installation, see page 94)
qU
Primary circuit return temperature sensor (for installation, see page 94)
wT
Primary pump, heat pump stage 2
Electrical installation scheme
For an overview of the electrical connec-
tions and more information on the PCBs,
see from page 76 and the separate
service instructions for the Vitotronic 200
heat pump control unit.
Preparing for installation
Heat pump cascade integration
(cont.)
5609 667 GB
