Danfoss DHP-H User Manual page 11

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 tempo-
rary increase or reduction, adjust the ROOM value instead.
rOOm
If you wish to increase or reduce the indoor temperature, change the ROOM value. The differ-
ence 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 °C for every degree
change of the ROOM value. The reason that the curve is adjusted ° is that an approximate °
increase in supply temperature is needed to increase the indoor temperature 1°.
Supply temperature
Figure 5: Changing the rOOm value changes the heat curve upwards or downwards .
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. that is, 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 -°C and +°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 for adjusting the curve at three outdoor temperatures: -°C, 0°C, +°C. If,
for example, the outdoor temperature is -°C, the supply temperature will change gradually
between 0°C and -10°C, maximum adjustment being reached at -°C. The figure below shows
the adjusted CURVE -. The adjustment can be seen in the graph in the form of a bump.
VUBMA102
Maximum supply tem-
perature
Outdoor temperature
Danfoss – 11