Setting the
cooling/heating curve
heating curve1.9.1.1
system
outdoor temp. °C
flow temperature °C
cooling curve 1.9.1.2
system
outdoor temp. °C
flow temperature °C
HEATING CURVE
Setting range: 0 – 15
Default value: 9
COOLING CURVE
Setting range: 0 – 9
Default value: 0
The prescribed heating curve for your house can be
viewed in the menu curve . The task of the heating curve
is to give an even indoor temperature, regardless of the
outdoor temperature, and thereby energy efficient oper-
ation. It is from this heating curve that the indoor mod-
ule’s control computer determines the temperature of
the water to the heating system, supply temperature,
and therefore the indoor temperature. Select the heating
curve and read off how the supply temperature changes
at different outdoor temperatures here. If there is access
to cooling the same settings can be made for the cooling
curve.
CURVE COEFFICIENT
The slopes of the heating /cooling curves indicate how
many degrees the supply temperature is to be in-
creased/reduced when the outdoor temperature
drops/increases. A steeper slope means a higher supply
temperature for heating or a lower supply temperature
for cooling at a certain outdoor temperature.
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 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 curve is set when the heating installation is installed,
but may need adjusting later. Normally, the curve will
not need further adjustment.
Caution
When making fine adjustments of the indoor
temperature, the curve must be offset up or
down instead, this is done in menu 1.1 temper-
ature .
CURVE OFFSET
An offset of the curve means that the supply temperat-
ure changes as much 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
With underfloor heating systems, max flow
line temperature should normally be set to
between 35 and 45 °C.
Must be restricted with underfloor cooling min.
flow line temp. to prevent condensation.
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.
NIBE VVM 320Chapter 6 | Commissioning and adjusting42
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