Setting the cooling/heating
curve
In the menus "Curve, heating" and "Curve, cooling", you can
see the heating and cooling curves for your house. The
purpose of the curves is to provide an even indoor temper-
ature, regardless of the outdoor temperature, and thereby
energy-efficient operation. Based on these curves,
VVM S320 determines the temperature of the water to the
climate system (the supply temperature) and thus the indoor
temperature.
CURVE COEFFICIENT
The slopes of the heating /cooling curves indicate how many
degrees the supply temperature is to be increased/reduced
when the outdoor temperature drops/increases. A steeper
slope means a higher supply temperature for heating or a
lower supply temperature for cooling at a certain outdoor
temperature.
20
0 10 0 -10 -20 -30 -40
30
40
50
60
70
80
Framledningstempereratur
(°C)
Utetemperatur
(°C)
Steeper curve slope
Supply temperature
Outdoor temperature
The optimum curve slope depends on the climate conditions
in your location, whether the house has radiators, fan coils
or underfloor heating and how well insulated the house is.
The heating/cooling curves are set when the heating/cooling
system is installed, but may need adjusting later. Thereafter,
the curves should not need further adjustment.
CURVE OFFSET
An offset of the heating curve means that the supply tem-
perature changes by the same amount for all outdoor tem-
peratures, e.g. a curve offset of +2 steps increases the
supply temperature by 5 °C at all outdoor temperatures. A
corresponding change to the cooling curve results in a
lowering of the supply temperature.
20
0 10 0 -10 -20 -30 -40
30
40
50
60
70
80
Framledningstempereratur
(°C)
Utetemperatur
(°C)
Offset heating curve
Supply temperature
Outdoor temperature
SUPPLY TEMPERATURE – MAXIMUM AND
MINIMUM VALUES
Because the supply temperature cannot be calculated
higher than the set maximum value or lower than the set
minimum value, the curves flatten out at these temperat-
ures.
20
0 10 0 -10 -20 -30 -40
30
40
50
60
70
80
Framledningstempereratur
(°C)
Utetemperatur
(°C)
Maximum value
Supply temperature
Outdoor temperature
Minimum value
Caution
With underfloor heating systems, the maximum
supply temperature is normally set between 35
and 45 °C.
Caution
Must be restricted with underfloor cooling min.
flow line temp. to prevent condensation.
31Chapter 6 | Commissioning and adjustingNIBE VVM S320
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