Calibration Menu / 7.4 - Input power

By default, the value of input electric energy is measured by the outdoor unit, i.e. the outdoor unit sends this measured value to MiniHPC. However, this value may not be completely accurate, as it does not account for, for example, the power consumption of the fan, the heating circulation pump, or the heating of the outdoor unit's chassis, etc.

If an external electric energy consumption sensor is installed before the heat pump, it is advisable to compare the values measured by that sensor with the values displayed by the outdoor unit of the air conditioner and, in case of discrepancy, calibrate this difference.

MiniHPC also offers the possibility to directly read data from an external watt meter that features a pulsed output S0.
This output can be connected to one of the available inputs on MiniHPC, either S1 or S2.
The external watt meter’s S0 output always specifies the polarity of the output wires. This must be observed when connecting to MiniHPC according to the following diagram (the diagram shows the S1 input).

After connecting the watt meter, you need to set which input (S1/S2) was used for reading the S0 output by selecting the option

Ext. meter on S1

Ext. meter on S2

and setting the number of pulses per 1 kWh at the S0 output. The default value is 1000 pulses/kWh, which should be changed to the value indicated on the connected watt meter.

It is advisable to choose watt meters with as high a pulses/kWh value as possible, due to a higher refresh rate of the measured value. Values between 1000–2000 are perfectly acceptable.

Please install the external watt meter in the distribution board with a DIN rail on the left side of MiniHPC, as the integrated WiFi antenna is located on the upper right side, and the WiFi signal may be adversely affected by electrical devices in its vicinity.

7.3 Flow sensor I1

7.5 IDU heat temperature