Part 1
apply the pressure again and observe for another 24 hours.
11 Evacuation
Connect the vacuum and refrigerant system via gauge
manifold ,draw out the air and moisture with vacuum pump from the pipe ,
then make system get vacuum and dry.
Important points:
11.1 Please must use vacuum pump to evacuate system, forbid to use
refrigerant to pile out the air from system.
11.2 The propositional vacuum pump is 40L/min, vacuum pointer should
be below -755mmHg.
11.3 It is better to operate evacuation treatment repeatedly , after 2 hours’
evacuation, charge some refrigerant to system , then evacuate for
another 2 hours, repeat to do it 2 or 3 times, the system can reach a high
vacuum level.
11.4 The vacuum should be maintained often to ensure it can reach high
vacuum level.
11.5 Because the electric expansion valve may be close, evacuation
work should be done both from high pressure and low pressure sides.
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