Danfoss DHP-AX User Manual page 13

Supply temperature
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 tempera-
tures: -5°C, 0°C and +5°C. This function will allow you to increase or reduce the set-
point value for the supply line temperature, without affecting the rest of the heat
curve, at three specific outdoor temperatures. If, for example, the outdoor tempera-
ture is -5°C, the supply temperature will change gradually between 0°C and -10°C,
maximum adjustment being reached at -5°C. The figure above 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 and +5°C. The supply temperature can be changed by plus/
minus 5 degrees.
3.4.4 HEAT STOP
The HEAT STOP function automatically stops all production of radiator heat when
the outdoor temperature 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.
3.4.5 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 setpoint values for the temperatures is par-
ticularly important if your home has under floor heating.
If your house has under floor heating and parquet floors, the supply temperature
must not be too high. Otherwise there is a risk that the parquet floors might be
Figure 7: The adjusted curve at -5°C
VUBMI102
Local higher supply temperature
at -5°
Outdoor temperature
DHP-AX – 13