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Vaillant VRC 430 Manual

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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
20
2
2
18
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
… 36 …


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