How to check the pumping of a 134a Compressor?
The best thing is to enquire the compressor manufacturer or OEM the way this can be tested. In India, KCL, Tecumseh and Godrej have their own recommendations. One universal method that can be adopted, subject to Compressor manufacturers agreeing, is to use a Compressor tester, which comprises of a Receiver like vessel with a relief valve and pressure gauge at one end and a hose with a quick coupler at the other end. The compressor has to be connected to Nitrogen through a syringe to avoid moisture. The syringe needle has to penetrate the rubber plug on the suction tube stub. The discharge tube stub is then connected to the quick coupler mentioned above. Nitrogen pressure should not exceed 0.5 to 1 barg. After all the connections are made the compressor has to build its own pressure of 16 bar. After the compressor is switched off, a pressure of 12 to 14 bar must be held for 60 seconds. The loss of pressure should not exceed 2 bar in 60 seconds.
