Manual Viessmann VITOCAL 252-A (page 60 of 72) (English)

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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.

3.2

3.4

Flow temperature in °C

Outside temperature in °C

Heating curve slope

3.0

2.8

2.2

2.4

2.0

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

1.8

2.6

1020 -30-20-100

Fig. 13

Appendix

Terminology (cont.)

6199646

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Viessmann VITOCAL 252-A Manual

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