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Heating circuit pump
Circulation pump for the circulation of the heating
water in the heating/cooling circuit.
Instantaneous heating water heater
The instantaneous heating water heater is an electric
booster heater built into the indoor unit.
If the required room temperature or DHW temperature
cannot be achieved with the heat pump alone, the
instantaneous heating water heater can be activated
automatically.
Note
Constant operation of an electric booster heater results
in high electricity consumption.
Hygiene function (increased DHW hygiene)
This function improves the microbiological quality of
the DHW by heating it to a higher temperature for a
short period.
Cascade
See "Heat pump cascade".
Cooling mode
In cooling mode, the flow temperature of the heat
pump is adjusted in relation to the type of heating/cool-
ing circuit, regardless of the outside temperature.
Where cooling is provided via underfloor heating cir-
cuits, the flow temperatures required are different from
those for cooling via a fan convector.
Cooling is switched on and off such that the room tem-
perature that you set is achieved.
Cooling circuit
See "Heating/cooling circuits".
Mixer
Hot heating water from the heat generator is mixed
with cooled heating water from the heating circuit. The
heating water, thus brought to the required tempera-
ture, is pumped to the heating circuit by the heating cir-
cuit pump. To ensure the required set room tempera-
ture is achieved, the control unit adjusts the flow tem-
perature via the mixer to suit different conditions.
Buffer cylinder
A buffer cylinder stores a large quantity of heating
water or coolant. This allows the heating/cooling cir-
cuits to be supplied over a longer period without the
heat pump needing to start up, e.g. during power-OFF.
Due to the large buffer volume, the heat pump contin-
ues to operate to heat or cool the buffer cylinder for
longer than it would if there were no buffer cylinder.
Infrequent starting of the heat pump and long runtimes
ensure long and efficient operation.
Appendix
Terminology (cont.)
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