Heat Stop; Min And Max; Temperatures - Danfoss DHP-A Service Instructions Manual

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When changing the CURVE value, the angle of the curve on the system's heat curve changes.
1
5 6
4 0
2 4
2 0
Figure 24. Changing the ROOM value changes the heat curve upwards or downwards.
Position
1
2
3
The relationship of the supply temperature to the 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 increa-
ses or reductions of the indoor temperature, the heat curve should be adjusted.
9.4

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 one 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 is de-activated.
9.5

MIN and MAX

The MIN and MAX values are the lowest, respectively highest set point values that are allowed for the supply tem-
perature.
Adjusting the minimum and maximum supply temperatures is particularly important if your home has under floor
heating.
If your house has under floor heating and parquet floors, the supply line temperature must not exceed 45°C. Oth-
erwise the floor might get damaged. If you have under floor heating and stone tiles, the MIN value should be
22-25°C, even in summer when no heating is required. This is to achieve a comfortable floor temperature.
If your house has a basement, the MIN value should be adjusted to a suitable temperature for the basement in
summer. A condition for maintaining the heat in the basement in the summer is that all radiators have thermostat
valves that switch off the heat in the rest of the house. It is extremely important that the heating system and the
radiator valves are trimmed correctly. As it is usually the end customers themselves who have to carry out trim-
ming, remember to inform them how to carry it out correctly. Also remember that the value for HEAT STOP needs
adjusting upwards for summer heating.
9.6

TEMPERATURES

The heat pump can display a graph showing the history of the various sensors' temperatures and you can see how
they have changed over 60 measurement points in time. The time interval between the measurement points can
be adjusted between one minute and one hour, factory setting is one minute.
History is available for all sensors, but only the set value is shown in the display for the room sensor. The integral
value that may appear is the heating system's energy balance.
30 – Service instructions VMGFC302
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Description
Supply temperature (°C)
Maximum supply temperature
Outdoor temperature (°C)
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3