The macro “ERC_Efficiency” calculates the efficiency of the energy recovery unit based on temperatures.
An efficiency level is used to generate an alarm if the ERC efficiency is too low.
Depending on the connected sensors, the macro can calculate the supply air or extract air efficiency.
For a valid output for the supply air efficiency you have to connect the sensors T1, T2 and T3.
For a valid output for the extract air efficiency you have to connect the sensors T1, T3 and T4.
If all four sensors are connected, the macro will calculate the supply air efficiency.