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Vaillant VRC 430f Manual

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17Operating instructions VRC 430f 0020042470_01
The desired room target temperature or the frost pro-
tection function is set. The display changes from high-
lighted to normal.
4.7.3 Entering parameters for the heating circuit
You can enter the following parameters:
Set-back temp
Outside the specified time windows, the
room temperature is reduced to the set-back temp.
If your heating engineer has set the frost protection
function the set-back temperature will automatically
be 5 °C. This is not displayed as a set-back tempera-
ture.
Heating curve
The relationship between the outside temperature and
the required heating flow temperature is represented
by a diagram with different heating curves (see
Fig. 4.15). Each heating curve (from 0.2 - 4.0) gives a
value for the heating flow temperature (vertical dia-
gram axis) for a specific outside temperature (hori-
zontal diagram axis).
Fig. 4.15 Diagram with heating curves for a target room tem-
perature of 20 °C
Example:
If heating curve 1.5 has been selected with a target
room temperature of 20 °C the controller
ensures a heating flow temperature of 56 °C at an out-
side temperature of 0 °C.
A range of steep heating curves show whether the heat-
ing flow temperature should be increased at a faster or
slower rate, depending on the outside temperature.
h
Note!
In a well-insulated appartment a comfortable
room temperature can be achieved even with a
flat heating curve. This saves heating energy.
Your heating engineer will provide advice as to
which heating curve should be selected.
To change the heating curve: (example heating circuit 1):
Turn the left-hand dial until you reach Screen 8
"HC1 Parameters".
HC1
Parameter
8
set-back temp 15 . 0 °C
Heating curve 1 . 2
> adjust temperature
Fig. 4.16 Screen 8 (example)
Turn the right-hand dial until the cursor is
positioned in front of the set-back temperature
value.
The display shows "Select temperature" in the comment
field.
Click the right-hand dial.
The field is highlighted.
Turn the right-hand dial until the desired
value is displayed (values from 5 °C to 30 °C in half
degree steps are possible).
Click the right-hand dial.
The required set-back temperature is set. The display
changes from highlighted to normal.
Turn the right-hand dial until the cursor is
positioned in front of the value for the heating
curve.
The display field shows the text "Set heating curve".
Click the right-hand dial.
The field is highlighted.
Turn the right-hand dial until the desired value is
displayed (values from 0.2 to 4.0 are possible, see
Fig. 4.15).
Click the right-hand dial.
Operation 4
17
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