In the event of outdoor temperatures below 0°C, a higher setpoint value is calculated and in the event of outdoor
temperatures greater than 0°C, a lower setpoint value is calculated.
Figure 23. Increasing or reducing the CURVE changes the slope of the curve.
Position Description
1 Temperature (°C)
2 Maximum setpoint value
3 Outdoor temperature (°C)
If the CURVE value is increased, the heat curve will become steeper and if the value is reduced, it will become flat-
ter.
The most energy efficient and cost effective setting is achieved by changing the CURVE value which leads to fewer
starts and longer operating times. For a temporary increase or reduction, adjust the ROOM value instead.
9.3 ROOM
If you wish to increase or reduce the indoor temperature, change the ROOM value. The difference between chang-
ing the ROOM value and the CURVE value is as follows:
•
When changing the ROOM value, the angle of the curve on the system's heat curve does not change, instead
the entire heat curve is moved by 3°C for every degree change of the ROOM value. The reason that the curve is
adjusted 3°C is that an approximate 3°C increase in supply temperature is usually needed to increase the
indoor temperature 1°C.
Service instructions VMGFC302 – 29
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