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19Installation instructions VRC 430f 0020042470_01
heating flow temperature is adjusted in the event of
deviation.
Thermostat
The in-built temperature sensor measures the current
room temperature in the reference room. If the meas-
ured value is below the target room temperature the
heating flow temperature is increased and if the value
is above the target room temperature the appliance is
switched off.
The use of the switch-on room temp., in combination
with careful selection of the heating curve, leads to opti-
mum control of the heating system.
Room target temperature
The room target temperature is the temperature that
should prevail in your apartment and is specified at the
controller. Your appliance supplies heat until the interior
temperature matches the room target temperature.
When entering time programmes the room target tem-
perature is also referred to as the comfort temperature.
Set values
Set values are desired values that you specify in the
controller, e.g. the room target temperature or target
temperature for water heating.
Summer/Winter changeover
In the 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 factory setting (as-supplied condition) is for auto-
matic changeover not to take place (Selection: Off).
If the VRC 430f is equipped with the wireless outdoor
sensor VR 21 that receives the radio time signal DCF77,
the summer/winter changeover takes place automatical-
ly; it is not possible to shutdown the automatic
changeover (selection: Off) in this case.
Flow temperature
See Heating flow temperature.
Water heating
The water in the hot water cylinder is heated to the se-
lected target temperature by the appliance. If the tem-
perature in the hot water cylinder falls by a specific
amount the water is heated again until it reaches the
target temperature. Time windows for water heating
can be programmed.
Time window
Three time windows can be programmed per day for the
heating, water heating and circulation pump (see
operating instructions Section 4.7.1).
A target value is allocated to each time window
programmed for the heating.
In the case of water heating the hot water target tem-
perature applies for all time windows (Screen
10 "Hot
water parameters").
In the case of the circulation pump the time windows
determine the operating times.
In automatic mode the system is controlled is in accord-
ance with the specified values in the time windows.
Circulation pump
Depending on the length of the pipe, there may be a
brief delay before hot water flows when the hot water
cock is opened. A circulation pump circulates hot water
via your hot water pipe. This means that hot water is
available instantly when the water cock is opened. Time
windows can be programmed for the circulation pump.
Appendix
Glossary
39


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