11.2.6
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.
11.2.7
INTEGRAL
The heat demand in the house depends on the season and weather conditions and is not constant. The heat demand
can be expressed as temperature difference over time and can be calculated giving an integral value as a result (heat
demand). To calculate the integral value, the control system uses several parameters.
A heat deficit is needed to start the heat pump, and there are two integral values, A1 (default value = -60), which
starts the compressor and A2, (factory set = -600), which starts the auxiliary heater and A3, which starts the external
auxiliary heater. During heat production, the deficit reduces and when the heat pump stops, the inertia in the system
causes a surplus of heat.
The integral value is a measurement of the area under the time axis and is expressed in degree minutes. The figure
below shows the factory settings for the integral values that the heat pump has. When the integral value has reached
the set value for INTEGRAL A1 the compressor starts. If the integral value does not reduce but continues to increase
the internal additional heat will start when the integral value reaches the set value for A2 and the external value at
set value for A3
1 5
7
3
4
1 4
11
1 3
1 2
3
4
6
1 2
11
8
8
2
5
2
1 0
9
1
5
1 0
9
15
15
16
Figure 23.
Starting and stopping heat pump operation based on integral values
Symbol explanation
1
Integral
2
Heat surplus
3
INTEGRAL A1
4
INTEGRAL A2
5
Heating deficit
6
Time
7
Heat pump operation
8
No operation
9
Compressor
10
Internal additional heater
Installation instructions
VMIFJ102
– 39
Summary of Contents for DHP-S&DP
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