Nibe S1156 - Setting the Heating Curve; Understanding Curve Coefficient; Maximum and Minimum Supply Temperatures; Heating Curve Offset Adjustment

Setting the heating curve
In the menu "Curve, heating", 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 S1156 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.
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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 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.
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40
50
60
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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.
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20 10 0 -10 -20 -30 -40
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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.
supply temp. cooling to prevent condensation.
ADJUSTMENT OF CURVE
Curve offset
Curve coefficient
Climate system
Supply temp. °C
Outdoor temp. °C
Curve
Offset
Climate system 1
1. Select the climate system (if more than one) for which
the curve is to be changed.
2. Select curve and offset.
3. Select max and min supply temperature.
NIBE S1156Chapter 6 | Commissioning and adjusting34