and replace all the lubricant; Note: Water, corrosive agents or combustible & explosive agents are
forbidden to clean air conditioning system. Cleaning agents of R-141b and methane are
recommended.
5. Lubricant should be injected from compressor exhaust vent before vacuumizing.
III. Sufficient vacuumizing time and vacuum degree
1. Vacuumize for over 20min with strong power vacuum pump;
2. Maintain the system absolute pressure below 1000Pa;
3. Before refrigerant injection, should maintain pressure for over 5min and make air tightness
examination; if the examination result is qualified, continue vacuumizing for 5min.
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