Viessmann Vitocal 300-G Installation And Service Instructions For Contractors page 48

Preparing for installation
System example 2, ID: 4605308_1006_01
Pos. Designation
DHW heating with a primary store system
eP DHW cylinder
eW Cylinder temperature sensor
eE Cylinder primary pump (DHW side)
eR
Plate heat exchanger
eT Flow limiter
eZ Motorised two-way valve, normally closed
eU DHW circulation pump
External heat source
qR High limit safety cut-out to switch off the secondary pumps 6 and qP
tP External heat source, e.g. oil boiler
tQ External heat source demand (connection to external heat source)
tW Circulation pump for cylinder reheating
tE Boiler water temperature sensor (connection to heat pump control unit)
tR Directly controlled mixer motor
tT High limit safety cut-out 70 °C for shutting down the external heat source
(on site)
Heating water buffer cylinder
zP Heating water buffer cylinder
zQ Buffer temperature sensor
zW System flow temperature sensor
48
(cont.)