Vaillant VRC 430 Operating and, Operating And Installation Manual

Page: 35 / 40

Axis a
20
22
18
Feed temperature
in ºC
Outside temperature in ºC
Fig. G.2 Parallel offset of the heating curve
If the heating curve 1.5 is selected and, for the set target
room temperature, 22 °C rather than 20 °C is specified,
then the heating curve is displaced as shown in Fig. G.2.
The heating curve is displaced in a parallel fashion on
the axis inclined at 45° by the value of the set target
room temperature. i.e. at an outside temperature of
0 °C, the control 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.
Hot water circulation pump
When you open the hot water tap it can take a few
moments - depending upon the length of the pipe -
before hot water comes out. A circulation pump pumps
hot water through the pipes in the hot water circuit.
This ensures that hot water is immediately available
when you open the tap. Time windows can be
programmed for the circulation pump.
Hot water generation
Your boiler heats the water in the hot water cylinder to
the selected target temperature. If the temperature in
the hot water cylinder falls by specific value, the water is
heated up again to the target temperature. Time
windows can be programmed for the hot water
generation.
Room temperature
The room temperature is the actual current temperature
in your apartment.
Operating level for the installer
It serves to display and to set/change specific
parameters. This user level is reserved for the installer
and is therefore protected by an access code.
Operating level for the user
It serves to display and to set/change the fundamental
parameters. Setting/changing the parameters can be
performed by the user without previous special
knowledge and during normal operation. The heating
system is continuously matched to the requirements of
the user by corresponding adjustment of the
fundamental parameters.
Appendix
Glossary
Operating and Installation instructions VRC 430