Viessmann VITOCAL 300-G PRO Installation And Service Instructions Manual page 30

Preparing for installation
Primary circuit: brine/water, 2-stage
Required equipment
Pos. Designation
1 Heat pump
2 Heat pump control unit
qT (First) primary pump (fail-safe)
wP
Brine safety assembly
wQ Pressure switch, primary circuit
wW Brine distributor for geothermal probes/collectors
wT Optional: Second primary pump (fail-safe) for stage 2
Note
■ Contactor relay required.
■ Size first primary pump qT for partial load.
wU
Geothermal probes/geothermal collectors
Electrical installation scheme
For a summary of electrical connections, see from page 53 and separate "Con-
nection and wiring diagram".
30
(cont.)