Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 54

Preparing for installation
System example 2
W DHW interface (see also DHW heat-
ing)
X Solar interface or external heat
source (see system examples)
Pos. Description
Heat source
1 Heat pump stage 1 (type BW)
2
Heat pump control unit
3 Outside temperature sensor
5 Circulation pump for cylinder heating (heating water side) for heat pump
stage 1 (type BW)
6 Secondary pump for heat pump stage 1 (type BW)
8 KM BUS distributor
9
Heat pump stage 2 (BWS)
qP Secondary pump for heat pump stage 2 (type BWS)
qQ Circulation pump for cylinder heating (heating water side) for heat pump
stage 2 (type BWS)
qW Safety equipment block with safety assembly
qE Expansion vessel
Primary circuit
qT Primary pump for heat pump stage 1 (type BW)
qZ Primary circuit flow temperature sensor (installation only required for two
stage heat pump, see page 84)
qU Primary circuit return temperature sensor (installation only required for two
stage heat pump, see page 84)
wT
Primary pump for heat pump stage 2 (type BWS)
wP Brine accessory pack
wQ Pressure switch, primary circuit
wW Brine distributor for geothermal probes/geothermal collectors
wU Geothermal probe/geothermal collector
54
(cont.)