Danfoss DHP-AL User Manual page 11

The relationship of the supply temperature to outdoor temperature will not be affected. The
supply temperature 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 only be for a rise or fall.
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 adjusting the curve at three outdoor temperatures: -5°C, 0°C and +5°C. 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.
Supply temperature
You can 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 degrees.
HEATSTOP
The HEATSTOP function automatically stops all production of heat when the outdoor tem-
perature 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 circulation pump will be "exercised" for 1 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 temperature must drop 3°C when setting, before the
heat stop stops.
MIN and MAX
The MIN and MAX values are the lowest, respectively highest set point values that are allowed
for the supply temperature.
Adjusting the minimum and maximum supply temperatures is particularly important if your
home has under floor heating.
If your house has under floor heating and parquet floors, the supply temperature must not
exceed the recommendations of the floor manufacturer. Otherwise there is a risk that the
parquet floors might be damaged If you have under floor heating and stone tiles, the MIN
Figure 7: The adjusted curve at -5°C
VUBMF102
Local higher supply
temperature at -5°
Outdoor temperature
Danfoss – 11