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Cooling mode is switched off during the power-OFF
period.
Electric booster heater
If the required room temperature or DHW temperature
cannot be achieved with the heat pump alone, an elec-
tric booster heater, e.g. an instantaneous heating
water heater, can be activated.
Note
Constant operation of an electric booster heater results
in high electricity consumption.
Underfloor heating
Underfloor heating systems are slow, low temperature
heating systems that respond only very slowly to short
term temperature changes.
Heating with reduced room temperature at night or
during short absences, therefore, does not result in
any significant energy savings.
Low-noise mode
Fans and compressors in the outdoor unit create
operational noise when running air source heat pumps.
In quieter operation, the speed of fans and, where rele-
vant, compressors is reduced so that operating noise
is lower. You set the start and end times of quieter
operation, such as night-times, through the time pro-
gram.
Note
The reduced fan and compressor speeds may mean
that less heating output is available.
Heating mode
In heating mode, the flow temperature of the heat
pump in relation to the outside temperature is regula-
ted so that the room temperature that you have set is
achieved: See "Heating curve".
The outside temperature is captured and transmitted to
the heat pump control unit by a sensor fitted outside
the building.
Standard heating mode or comfort heating mode
For periods when you will be at home, heat your rooms
to the standard room temperature or the comfort room
temperature. Set the periods (time phases) using the
time program for central heating/cooling.
Reduced heating mode
For periods when you will be absent or during the
night, heat your rooms to the reduced room tempera-
ture. Set the periods using the time program for central
heating/cooling. With underfloor heating systems,
reduced heating mode only yields limited energy sav-
ings: See "Underfloor heating".
Heating curve
Heating curves illustrate the relationship between the
outside temperature, the set room temperature and the
flow temperature. The lower the outside temperature,
the higher the flow temperature.
In order to guarantee sufficient heat with minimum
energy consumption at any outside temperature, the
conditions of your building and system must be taken
into consideration. The heating curve is adjusted by
your contractor for this purpose.
Appendix
Terminology (cont.)
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