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11Operating manual for the auroMATIC 620 0020094404_00 Controller
i
Get your expert technician to advise you
about the optimum setting of the heating
curve, as the measured outside temperature
and the preset heating curve will also affect
the control of the heating.
You have two options for defining the days for which
your time windows should apply:
1st option
You can enter time windows for individual days.
example:
Mon 09.00 - 12.00 hrs.
Tue 10.00 - 12.00 hrs.
2nd option
You can combine several days into blocks.
example:
Mon-Fri 09.00 - 12.00 hrs.
Sat-Sun 12.00 - 15.00 hrs.
Mon-Sun 10.00 - 12.00 hrs.
You can define up to three time windows for each
option.
You can control the hot water temperature in a con-
nected DHW cylinder in the same way using the control-
ler: The time windows you define specify when the hot
water at your desired temperature is available.
The cylinder is charged by the solar system. If there is
inadequate solar gain, the cylinder is charged from the
boiler.
However there is no night set back temperature for hot
water generation. Hot water generation is switched off
at the end of a time window.
Heating curve
The heating temperature is controlled indirectly by
means of a heating curve. The heating curve shows the
relationship between the outside temperature and the
flow temperature.
The flow temperature is the temperature of the heating
water as it leaves the boiler.
You can set the heating curve individually for each hea-
ting circuit.
You have the option of selecting various heating curves
to match the control system optimally to your apart-
ment and to the heating installation.
Example of a heating curve
Max Flow Setpoint.
Heating curves
1.5
2.02.53.04.0 3.5
1.2
1.0
0.6
0.2
in °C
90
80
70
60
50
40
30
20
20 15 -15 -2010 -105-50
Outside temperature in °C
Fig. 3.3 Diagram with heating curves
Example: If heating curve 1.5 is selected, a flow
temperature of 75 °C is required for an external tempe-
rature of -15 °C.
Max Flow Setpoint.
Outside temperature in °C
in °C
90
80
70
60
50
40
30
15
Axis a
182022
10 5 0 -5 -10 -15 -20
1.5
Fig. 3.4 Parallel offsetting of the heating curve
If heating curve 1.5 is selected and 22 °C rather than
20 °C is specified as the room target temperature, the
heating curve is displaced as shown in Fig. 3.4. The
heating curve is displaced in parallel along the 45° axis
according to the value of the room target temperature.
This means that when the outside temperature is 0 °C,
the controller provides a flow temperature of 67 °C.
i
Your expert technician will have made the
required basic setting of the heating curve
while installing the heating system.
Description of the appliance 3
13


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