Yes for every APR Control, there will be at least 3 connections that need to be made (some have 4). All piping connection will be made within the compressor compartment of the condensing section/unit.
The Compression Ratio Reduction Valve (CRR Valve) should be piped into the compressor discharge line, after the compressor before the condenser.
The Mixed Gas Discharge line of the APR should be piped into the suction line after the evaporator and towards the inlet of the compressor.
The liquid line….
Please follow our piping diagram included in the box with your APR Control and can be found Here… (Link)