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Topping up of Oil in Refrigerator Compressor

In a refrigeration compressor, oil and gas exist together in the compressor crankcase, even when the compressor is cut off or stopped there exist a positive pressure in the compressor crankcase. 

Hence the oil top up in a fridge compressor is done with a hand pump.

  • Compressor crankcase has an oil charging valve,
  • Oil charging hand pump is connected to this charging valve,
  • Air is purged from the hand pump discharge hose and the union is tightened on the charging valve,
  • By using the hand pump oil is pumped from a clean container to the crankcase,
  • Oil level is observed in the gauge glass as the pumping is carried out,
  • Pumping is stopped when the gauge shows about half full.
  • Charging valve is closed and the pump is removed.

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