8.5.3 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.
•
When changing the CURVE value, the angle of the curve on the system's heat curve changes.
Figure 3. Changing the ROOM value changes the heat curve upwards or downwards.
Position Description
1 Supply temperature (°C)
2 Desired supply temperature
3 Outdoor temperature (°C)
The relationship of the supply temperature to the outdoor temperature will not be affected. The supply tempera-
ture will be increased or reduced by the same number of degrees all along the heat curve. I.E. The entire heat curve
rises or drops instead of the curve gradient changing.
This method of adjusting the indoor temperatures can be used for a temporary raise or drop. For long term increa-
ses or reductions of the indoor temperature, the heat curve should be adjusted.
8.5.4 Adjusting the heat curve at -5°C, 0°C and 5°C
Sometimes, at outdoor temperatures between -5°C and +5°C, part of the heat curve may need adjusting if the
indoor temperature is not constant. For this reason, the control system includes a function which only adjusts the
heat curve at three outdoor temperatures: -5°C, 0°C and +5°C. This function will allow one to increase or reduce
the setpoint value for the supply line temperature, without affecting the rest of the heat curve, at three specific
outdoor temperatures. If, for example, the outdoor temperature is -5°C, the supply temperature will change gradu-
ally between 0°C and -10°C, maximum adjustment being reached at -5°C. The figure below shows the adjusted
CURVE -5. The adjustment can be seen in the graph in the form of a bump.
Choose to adjust the heat curve individually at three specified outdoor temperatures: -5°C, 0°C and +5°C. The sup-
ply temperature can be changed by plus/minus 5°C.
Installation instructions VMGFD102 – 41
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