Danfoss DHP-H Installation And Service Instructions Manual page 45

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°.
Supply temperature
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 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
constant. For this reason, the control system includes a function adjusting the curve at three outdoor temperatures: -5°C, 0°C and +5°C.
This function will allow you to increase or reduce the supply temperature, without affecting the heat curve, at three specific outdoor tem-
peratures. 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 displays the adjusted CURVE -5. The adjustment can be seen on 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 and +5°C. The supply temperature
can be changed by plus/minus 5 degrees.
Figure 85: Changing the ROOM value changes the heat curve upwards or downwards.
Supply temperature
Figure 86:
Maximum supply tem-
perature
Outdoor temperature
Local higher supply tem-
perature at -5°
The adjusted curve at -5°C
VMBMA602
Outdoor temperature
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