Glossary - Vaillant geoTHERM VWS 220/2 Instrucciones De Operación

10

Glossary

Night set back temp.
The night set back temp. is the temperature to which your
heating installation reduces the room temperature outside
of the programmed time window.
Operation mode
The operation modes are used to determine how your heat-
ing installation or DHW loading is controlled, e.g.
in automatic or manual mode.
DCF receiver
A DCF receiver receives a remote time signal from sender
DCF77 (D-Deutschland C-Long-wave transmitter F-Frankfurt
77). The time signal sets the time on the controller auto-
matically and provides automatic switching between sum-
mer time and winter time. A DCF time signal is not available
in all countries.
Frost protection function
The frost protection function protects your heating installa-
tion and apartment from frost damage. It is also active in
the „OFF" operation mode.
The frost protection function monitors the outside tempera-
ture. If the outside temperature drops below 3°C, the heat-
ing pump is switched on for approx. 10 min. and then off for
10 to 60 min. (depending on the outside temperature). If the
heating flow temperature is lower than 13 °C, the boiler is
switched on. The target room temperature is regulated at
5 °C. If the outside temperature rises above 4 °C, the out-
side temperature monitoring remains active while the heat-
ing pump and boiler are switched off.
If the outside temperature drops below -20 °C, the boiler is
switched on. The target room temperature is regulated at
5 °C.
Heating circuit
A heating circuit is a closed circulation system of pipes and
heat consumers (e. g. radiators). The heated water from the
boiler flows into the heating circuit and returns to the boiler
as cooled water.
A heating installation usually has at least one heating cir-
cuit. However additional heating circuits can be connected,
e.g. to supply several apartments or additional underfloor
heating.
HK2
HK2 refers to heating circuit 2 in addition to the unit-inter-
nal heating circuit 1. It therefore refers to the first heating
circuit in your heating installation.
Heating curve
The heating curve represents the relationship between the
outside temperature and the flow temperature. The selec-
tion of a heating curve allows you to influence the flow tem-
perature of your heating system and therefore also the
room temperature.
Operating instructions geoTHERM 0020051578_03
Fig. 10.1 shows the possible heating curves for a target room
temperature of 20 °C.
If, for example, heating curve 0.4 is selected, a flow temper-
ature of 40 °C is maintained at an outside temperature of
-15 °C.
Flow temperature
in °C
4.0 3.5 3.0 2.5
70
60
50
40
30
15 10 5
10.1 Heating curve diagram
Flow temperature
in °C
70
60
50
40
30
22
20
15 10 5
Target
18
room Axis a
temperature
10.2 Parallel displacement of the heating curve
If heating curve 0.4 is selected and 21 °C rather than
20 °C is specified as the target room temperature, the heat-
ing curve is displaced as shown in Fig. 10.2. The heating
curve is displaced according to the value of the target room
temperature along axis a which is angled at 45°. This
means that when the outside temperature is -15 °C, the
control provides a flow temperature of 45 °C.
Heating flow temperature
Your boiler heats water which is then pumped through your
heating installation. The temperature of this hot water as it
leaves the boiler is referred to as the flow temperature.
Legionella
Legionella are water-borne bacteria which can quickly prop-
agate and cause serious lung diseases. They occur wher-
ever heated water provides the optimum conditions for
multiplication. Temporarily heating the water to above 60
°C kills off the legionella.
Room temperature
The room temperature is the temperature actually meas-
ured in your apartment.
Glossary 10
Heating curves
1.2
2.0 1.8 1.5
1.0
0.8
0.6
0.4
0.2
0.1
0 -5 -10 -15 -20
Outside temperature in °C
0.4
0 -5 -10 -15 -20
Outside temperature in °C
GB
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