Nibe S1255PC - Page 30

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 con-
ditions 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/cool-
ing system is installed, but may need adjusting later.
Thereafter, the curves should not need further adjust-
ment.
CURVE OFFSET
An offset of the curve means that the supply temperat-
ure changes by the same amount for all the outdoor
temperatures, e.g. a curve offset of +2 steps increases
the supply temperature by 5 °C at all outdoor temperat-
ures. A corresponding change to the cooling curve res-
ults 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
temperatures.
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 maxim-
um supply temperature is normally set
between 35 and 45 °C.
Check the max floor temperature with your
floor supplier.
Caution
Must be restricted with underfloor cooling min.
flow line temp. to prevent condensation.
ADJUSTMENT OF CURVE
System 1
Outdoor temp °C
Supply temp °C
Min supply temperature
Max supply temperature
Curve offset
Curve coefficient
Climate system
Max
Min
1.
Select the climate system (if more than one) for
which the curve is to be changed.
2.
Select curve slope and curve 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.
NIBE S1255PCChapter 6 | Commissioning and adjusting30