Nibe S1255 - Page 32

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.
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.
Caution
Curve 0 means that "Own curve" is used.
Settings for "Own curve" are made in menu 1.30.7.
TO READ OFF A HEATING CURVE
1. Drag in the circle on the axis with outdoor temperature.
2. Read off the value for supply temperature in the circle
on the other axis.
NIBE S1255Chapter 6 | Commissioning and adjusting32