A refrigerant compressor comprising a compressor unit with a compressor housing and, arranged in the compressor housing, at least one compressor element for compression of refrigerant, a drive unit with a drive housing and an electric motor arranged in the drive housing and, arranged on the drive housing, connection terminals (42, 44, 46) for the electric motor, and further comprising an electronic functional unit, wherein a compressor function of the electronic functional unit is a parameter detection function, wherein for carrying out the parameter detection function there are detected the temperature of the electric motor as a function parameter and at least one of the function parameters such as lubricant temperature, lubricant differential pressure, preferably by measurement of a pressure difference, for example at a lubricant pump unit, lubricant level, wherein a further compressor function is a protective function, wherein for carrying out the protective function there is carried out the parameter detection function and the detected function parameters are compared with at least one reference parameter, wherein upon overshooting or undershooting the at least one reference parameter there occurs a switching off of the refrigerant compressor, wherein a further compressor function is a control function, wherein a further compressor function is an operational status monitoring function, wherein for carrying out the operational status monitoring function there occurs a recording of the carrying out of the at least one parameter detection function and the at least one protective function and the at least one control function, wherein the recording of the function parameters and the carrying out of the at least one protective function and the carrying out of the at least one control function occurs over time and wherein the electronic functional unit communicates with a communication unit for the exchange of data with an external higher-level system control. the temperature of the electric motor as a function parameter and at least one of the function parameters such as lubricant temperature, lubricant differential pressure, preferably by measurement of a pressure difference, for example at a lubricant pump unit, lubricant level, wherein a further compressor function is a protective function, wherein for carrying out the protective function there is carried out the parameter detection function and the detected function parameters are compared with at least one reference parameter, wherein upon overshooting or undershooting the at least one reference parameter there occurs a switching off of the refrigerant compressor, wherein a further compressor function is a control function, wherein a further compressor function is an operational status monitoring function, wherein for carrying out the operational status monitoring function there occurs a recording of the carrying out of the at least one parameter detection function and the at least one protective function and the at least one control function, wherein the recording of the function parameters and the carrying out of the at least one protective function and the carrying out of the at least one control function occurs over time and wherein the electronic functional unit communicates with a communication unit for the exchange of data with an external higher-level system control.