Bedienungsanleitung Vaillant VRC 430 (Seite 36 von 40) (Englisch)

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Installation Instructions VRC 430 0020042468_0216

Fig. G.1 Diagram with heating curves for a target room temper-

ature of 20 °C

Axis a

Feed temperature

in ºC

Outside temperature in ºC

Fig. G.2 Parallel offsetting the heating curve

If you select heating curve 1.5 with a room target tem-

perature of 22 °C rather than 20 °C, the heating curve

is displaced as shown in Fig. G.2. The heating curve is

displaced in parallel along the 45° axis according to the

value of the room target temperature. This means,

therefore, if the external temperature is 0 °C, the con-

trol system provides a flow temperature of 67 °C.

Heating flow temperature

Your boiler heats water which is pumped through your

heating system. The temperature of this hot water as it

leaves the boiler is referred to as the flow temperature.

Internal temperature

The internal temperature or room temperature is the

actual current temperature in your apartment.

Parameters

Parameters are the properties of your heating system.

You can influence these properties by altering the value

of a parameter, e.g. changing the "set-back tempera-

ture" parameter from 15 °C to 12 °C.

Room switch-on control (expert technician level)

In the screen C8 "HC1 Parameter", in the menu point

"Room control" you can decide whether to use the tem-

perature sensor fitted in the VRC 430 or in the remote

control unit. To do this the VRC 430 must be wall-

mounted and the remote control unit VR 81 must be

connected.

The following entries are possible in the menu point

"Room switch-on control":

– None

The temperature sensor is not used for control sys-

tem.

– Switching

The in-built temperature sensor measures the current

room temperature in the reference room. This value is

compared with the room target temperature and, if

there is a difference, the heating flow temperature is

adjusted accordingly.

– Thermostat

The built-in temperature sensor measures the current

room temperature in the reference room. If the meas-

ured value is lower than the room target temperature,

the heating flow temperature is increased; if the value

is higher than the room target temperature, the boiler

is switched off.

The use of the room switching, in combination with

careful selection of the heating curve, leads to optimum

control system of the heating system.

Target room temperature

The target room temperature is the temperature that

you would like in your apartment and which is specified

in your controller. Your boiler continues to provide heat

until the internal temperature is equal to the target

room temperature.

When entering the time programmes, the target room

temperature is also referred to as the "comfort temper-

ature".

Target values

Target values are the desired values which you specify

to the controller. e. g. the target room temperature or

the target temperature for the hot water preparation.

Appendix

Glossary

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