The optimum slope depends on the climate conditions
in your location, if the house has radiators or under floor
heating and how well insulated the house is.
The heating curve is set when the heating installation is
installed, but may need adjusting later. Thereafter the
heating curve should not need further adjustment.
Caution
When making fine adjustments of the indoor
temperature, the heating curve must be offset
up or down instead, this is done in menu 1.1
temperature .
Curve offset
An offset of the heating curve means that the supply
temperature changes by the same amount for all the
outdoor temperatures, e.g. that a curve offset of +2 steps
increases the supply temperature by 5 °C at all outdoor
temperatures.
Flow line temperature– maximum and
minimum values
Because the flow line temperature cannot be calculated
higher than the set maximum value or lower than the
set minimum value the heating curve flattens out at
these temperatures.
Caution
Under floor heating systems are normally max
flow line temperature set to between 35 and
45 °C.
Check the max temperature for your floor with
your installer/floor supplier.
The figure at the end of the curve indicates the curve
slope. The figure beside the thermometer gives the curve
offset. Use the control knob to set a new value. Confirm
the new setting by pressing the OK button.
Curve 0 is an own curve created in menu 1.9.7.
To select another curve (slope):
1. Press the OK button to access the setting mode
2. Select a new curve. The curves are numbered from
0 to 15, the greater the number, the steeper the
slope and the greater the supply temperature. Curve
0 means that own curve (menu 1.9.7) is used.
3. Press the OK button to exit the setting.
To read off a curve:
1. Turn the control knob so that the ring on the shaft
with the outdoor temperature is marked.
2. Press the OK button.
3. Follow the grey line up to the curve and out to the
left to read off the value for the supply temperature
at the selected outdoor temperature.
4. You can now select to take read outs for different
outdoor temperatures by turning the control knob
to the right or left and read off the corresponding
flow temperature.
5. Press the OK or Back button to exit read off mode.
TIP
Wait 24 hours before making a new setting, so
that the room temperature has time to stabilise.
If it is cold outdoors and the room temperature
is too low, increase the curve slope by one incre-
ment.
If it is cold outdoors and the room temperature
is too high, lower the curve slope by one incre-
ment.
If it is warm outdoors and the room temperature
is too low, increase the curve offset by one incre-
ment.
If it is warm outdoors and the room temperature
is too high, lower the curve offset by one incre-
ment.
29Chapter 6 | Commissioning and adjustingNIBE F1226
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