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This system contains R404A or R134A refrigerant and polyolester lubricant. The polyol ester lubricant has rapid moisture absorbing qualities. 2. Drier replacement is very important and must be changed when a system is opened for servicing. A 620 copper drier or better is highly recommended. 3. Micron level vacuums must be achieved to insure low moisture levels in the system. 500 microns or lower must be obtained. 4. When compressor is grounded, suction filter drier and 620 drier or better must b