System Examples - Viessmann Vitocal 300-G Series Installation And Service Instructions Manual

Information
Product information
Design
Heat pump stage 2 has a separate refrigerant circuit
with refrigerant circuit controller, but no separate heat
pump control unit. Stage 2 is switched via the heat
pump control unit of stage 1.
Hydraulics
On the primary side of a 2-stage version, either use a
separate primary pump for each stage, or use a
shared primary pump. Irrespective of this, the flow and
return temperature sensors are installed in the primary
circuit on the shared flow and return.

System examples

Available system examples: See www.viessmann-
schemes.com.
8
(cont.)
Depending on the hydraulic connection, heat pump
stage 2 can be used both for central heating and for
DHW heating. A separate secondary pump and circu-
lation pump for cylinder heating (both accessories) are
therefore required for the heat pump stage 2.