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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