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OIL RECOVERY OPERATION METHOD OF A MULTI-AIR CONDITIONER FOR EXPANDING THE LIFE SPAN OF A COMPRESSOR BY RECOVERING THE OIL REMAINING IN AN INDOOR DEVICE TOGETHER WITH REFRIGERANT TO THE COMPRESSOR
OIL RECOVERY OPERATION METHOD OF A MULTI-AIR CONDITIONER FOR EXPANDING THE LIFE SPAN OF A COMPRESSOR BY RECOVERING THE OIL REMAINING IN AN INDOOR DEVICE TOGETHER WITH REFRIGERANT TO THE COMPRESSOR
