Viessmann Vitocal 300-G Installation And Service Instructions For Contractors page 21

Primary circuit, type BW + BWS (two-stage)
Hydraulic installation scheme
wP
qT
wW
wU
P Primary circuit interface
Equipment required
Pos. Designation
1 Heat pump stage 1
2
Heat pump control unit
9 Heat pump stage 2
qT Common primary pump
qZ
Primary circuit flow temperature sensor (for installation, see page 87)
qU Primary circuit return temperature sensor (for installation, see
page 87)
wP Brine accessory pack
wQ Pressure switch, primary circuit
wW
Brine distributor, geothermal probes/collectors
wU Geothermal probes/collectors
wQ wQ qZ
P P P P
P
qU
Preparing for installation
(cont.)
2
9 1
21