Fig. 8: Changing the ROOM value changes the heat curve upwards or downwards
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.
7.4 Adjusting the 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
gradually 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 supply temperature can be changed by plus/
minus 5°C.
Fig. 9: The adjusted curve at -5°C
1. Supply temperature (°C)
2. Outdoor temperature (°C)
3. Local higher supply temperature at -5°C
7.5 HEAT STOP
The HEAT STOP function automatically stops all production of radiator heat when the outdoor temperature is equal to, or higher than,
the value entered for heat stop.
When the heat stop function is activated, the circulation pump will be turned off - except when hot water is being produced. The circula-
tion pump will be "exercised" for one minute per day.
The factory set value for activating heat stop is an outdoor temperature of 17°C. If the heat stop function is active, the outdoor tempera-
ture must drop 3°C below the heat stop setting, before the heat stop is deactivated and heat production starts again.
Commissioning
Danfoss Heating Solutions VIGFH102
25
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