Danfoss DHP-H Installation And Service Instructions Manual page 31

If you increase the CURVE value, the heat curve will become steeper and when you reduce it, it will become flatter.
The most energy efficient and cost effective setting is achieved by changing the CURVE value to adjust the temperature in the house to an
even and constant temperature. For a temporary increase or reduction, adjust the ROOM value instead.
ROOM
If you wish to increase or reduce the indoor temperature, change the ROOM value. The difference between changing the ROOM value and
the CURVE value is that the system's heat curve does not become steeper or flatter if the ROOM value is changed, which the curve becomes
if the CURVE value changes, 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° is that an approximate 3° increase in supply temperature is needed to increase the indoor temperature 1°.
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 must only be used for a temporary raise or drop. For long term increases or reductions
of the indoor temperature, the heat curve is adjusted instead.
Sometimes, at outdoor temperatures between -5°C and +5°C, part of the heat curve may need adjusting if the indoor temperature is not con-
stant. For this reason, the control system includes a function adjusting the curve at three outdoor temperatures: -5°C, 0°C, +5°C. This function
will allow you to increase or reduce the supply temperature, without affecting 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.
You can choose to adjust the heat curve individually at three specified outdoor temperatures: -5°C, 0°C, +5°C. The supply temperature can
be changed by plus/minus 5 degrees.
Supply temperature
Figure 54: Increasing or reducing the CURVE changes the slope of the curve
Supply temperature
Figure 55: Changing the ROOM value changes the heat curve upwards or downwards .
Supply temperature
Figure 56: The adjusted curve at -5°C
Maximum supply tem-
perature
Outdoor temperature
Maximum supply tem-
perature
Outdoor temperature
Local higher supply tem-
perature at -5°
VMBMA102
Outdoor temperature
1