Setting The Heating Curve - Nibe VVM 500 Installer Manual

Setting the heating curve

In the menu "heating curve", you can see the heating curve
for your house. The task of the curve is to provide an uniform
indoor temperature, regardless of the outdoor temperature,
and thereby energy-efficient operation. Based on this curve,
the VVM 500 determines the temperature of the water to
the climate system (the supply temperature) and thus the
indoor temperature.
CURVE COEFFICIENT
The slope of the heating curve indicates 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 at a certain outdoor
temperature.
Supply temperature
Framledningstempereratur
(°C)
80
70
Steeper curve slope
60
50
40
30
20
0 10 0
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 curve is set when the heating installation is in-
stalled, but may need adjusting later. Normally, the curve
will 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.
Supply temperature
Framledningstempereratur
(°C)
80
70
Offset heating curve
60
50
40
30
20
0 10 0
34 Chapter 6 | Commissioning and adjusting
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Outdoor temperature
Utetemperatur
(°C)
-10 -20 -30 -40
Outdoor temperature
Utetemperatur
(°C)
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.
Supply temperature
Framledningstempereratur
(°C)
80
70
Maximum value
60
50
40
30
20
0 10 0
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.
ADJUSTMENT OF CURVE
Climate system
system
flow temperature °C
Min supply temperature
1. Select the climate system (if more than one) for which
the curve is to be changed.
2. Select curve and offset.
Minimum value
-10 -20 -30 -40
Outdoor temperature
Utetemperatur
(°C)
Curve offset
Curve coefficient
heating curve 1.9.1.1
outdoor temp. °C
Max supply temperature
NIBE VVM 500