Viessmann Vitocal 300-G Installation And Service Instructions Manual page 41

Integrating a heat pump cascade into the system...
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
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
qQ 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 90)
qU
Primary circuit return temperature sensor (for installation, see page 90)
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 72 and the separate
service instructions, Vitotronic 200 heat
pump control unit.
Preparing for installation
W Interface to the DHW cylinder
I Lead appliance (two-stage) of
the heat pump cascade
II to IV Lag heat pumps 1 to 3, each
two-stage
(cont.)
41