1. Recycle the system refrigerant to the condenser side, remove the refrigerant in the compressor, and discharge the refrigeration oil from the oil drain angle valve of the compressor.
2. The lubricating oil of the compressor is discharged from the oil drain valve on the oil filter. When the lubricating oil is nearly exhausted, a certain amount of nitrogen is added from the detection joint of the high pressure end of the compressor, and the pressure is used to speed up the discharge of the lubricating oil and stop the injection. pressure, close the drain valve. Then remove the oil filter of the compressor, release all the lubricating oil in the oil tank, clean the oil filter and install it tightly.
3. Add lubricating oil according to the standard amount of the compressor, and evacuate the system at the same time. It is recommended to select the high (low) pressure side angle valve or other relative high point for the contact of the vacuum pump, so as to prevent the vacuum pump from being damaged by pumping the refrigerated oil. When vacuum maintaining or leak checking, observe whether the pressure rebounds.
4. Inject lubricating oil, connect it to the oil drain valve with a clean plastic tube, and put the other end of the plastic tube into the oil drum (the plastic tube is placed at the bottom of the oil drum). When filling oil, the oil drum should be closed to reduce air pollution to the oil.
