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17Installation Instructions VRC430 0020042468_02
Summer/Winter changeover
In the display screen
1 "Basic Data" in the menu point
"Mode selection" you can determine whether the
changeover from summer to winter should take place
automatically
(Selection: Auto).
The default setting is switches off automatic changeo-
ver (Selection: Off).
If the VRC 430 is equipped with the external sensor
VRC 9535 which receives the DCF77 time signal, sum-
mer/winter changeover takes place automatically; in
this case there is no way to switch off the automatic
changeover option (Selection: Off).
Flow temperature
See Heating flow temperature.
Hot water generation
Your boiler heats the water in the domestic hot water
cylinder to the selected target temperature. If the tem-
perature in the domestic hot water cylinder falls by spe-
cific value, the water is heated up again to the target
temperature. Time windows can be programmed for hot
water generation.
Time window
You can specify three time windows per day for heating,
hot water generation and the circulation pump (see op-
erating instructions Section 4.7.1).
Every heating time window is assigned a target value.
The hot water target value is used as a basis for gener-
ating hot water (screen 10 "Hot water parameters").
The time windows specify the time for the circulation
pump.
In automatic mode the system is controlled as per the
specified values in the time windows.
Circulation pump
When you turn on the hot water tap it can take a few
moments - depending upon the length of the pipe - be-
fore 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 turn on the tap. Time windows can be programmed
for the circulation pump.
Appendix
Glossary
37


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