Danfoss DHP-AX Installation And Service Instructions Manual page 25

At outdoor temperatures colder than 0°C, supply water hotter than 40°C is sent out to the heating system and
at outdoor temperatures greater than 0°C, supply water cooler than 40°C is sent out.
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.
11.5.3 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°C is that an approximate 3°C increase in supply temperature is usually needed to increase the indoor tem-
perature 1°C.
Figure 21: 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 tempera-
ture 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.
Supply temperature
Figure 20: Increasing or reducing the CURVE changes the slope of the curve
Supply temperature
VMBMH302
Maximum supply tem-
perature
Outdoor temperature
Maximum supply tem-
perature
Outdoor temperature
Service – 25