Integrating A Heat Pump Cascade Into The System Examples - Viessmann Vitocal 350-G Installation And Service Instructions Manual

Preparing for installation
Integrating the 2-stage version in the system...
C Interface to the separate cooling cir-
cuit or heating/cooling circuit
H Interface to the heating circuits or
the heating water buffer cylinder
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
qW Safety equipment block with safety assembly
qE Expansion vessel
qT Primary pump, heat pump stage 1
qZ Flow temperature sensor, primary circuit
qU Return temperature sensor, primary circuit
wT Primary pump, heat pump stage 2

Integrating a heat pump cascade into the system examples

A heat pump cascade consists of a lead
appliance and lag heat pumps.
Each lag heat pump has a heat pump
control unit. Both lead appliance and lag
heat pumps can have 2 stages.
The lead appliance regulates the heat
pump operation within the cascade.
38
P Interface to the primary circuit
W Interface to the DHW cylinder
■ Up to max. 3 lag heat pumps when
connecting via KM-BUS in conjunction
with the external extension H1 (see
page 89 and separate service
instructions for heat pump control unit
Vitotronic 200).
■ Up to 4 lag heat pumps when connect-
ing via LON (see separate service
instructions for heat pump control unit
Vitotronic 200).
(cont.)