How do you charge 404a into an ice machine so do i turn the cylinder upside down and charge through the low side the 404a cylinder says charge as a liquid only and do not connect to hi side so i can only charge through the low side do i need to get a special valve that flashes the liquid into gas or is that already built into the cylinder or can i slowly add liquid through the low side . Charging by weight is one of the most accurate and fastest methods of charging a system that has a known refrigerant charge typically this method requires an already evacuated system that is ready for charge or removal of the existing charge so the proper charge can be weighed in. To bring you up to date the system was evacuated filled with dry nitrogen at 150 psi leak tested then evacuated again r404a was added as a liquid using a scale i could not find the charging amount stamped on the compressor or on the internet so i tried 25 lbs i started up the unit. Freontm 404a hp62 has been the long standing hfc replacement for r 502 and r 22 in refrigeration applications hfc 404a is included in the us epa snap de listing of hfcs that will no longer be acceptable in certain end use applications in the us market. Refrigerant system charging refrigerant charging is one of the most important and probably least understood service procedures practiced in the air conditioning industry improperly charged systems lead to inefficient operation and premature equipment failure the graph below illustrates a typical package cooling system charge
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