Refrigerant charging procedures for air conditioners heat pumps refrigeration equipment using a test gauge set and charging cylinder or scale procedure for evacuating or pulling a vacuum on air conditioners heat pumps or refrigeration equipment procedure for charging the hvac system appliance with refrigerant using gauge set current service standards including precision and recovery . Page 13 liquid pull recovery charging method stinger the virgin refrigerant is pulled directly into the system being charged the stinger keeps the pressure low in the system by removing vapor for every pound of vapor removed as much as 25 pounds of liquid refrigerant may be. Page 8 connecting the refrigerant piping 1 connect the liquid refrigerant connection from the indoor unit to the vacuum for 1 hour do the following the liquid stop valve of the outdoor unit check for leaks again perform vacuum drying again. For every 10 ft of liquid line of recommended size over 25 ft add refrigerant charge as follows 41b for 3 8 in line 28 lb for 5 16 in line on all other systems adjust eharge for correct operation as applicable service port eonnections are provided on liquid and suction line service valves for evacuation and charging see fig 1. Open the refrigerant 22 drum valve slightly to allow a small amount of refrigerant r 22 to purge air from the hoses tighten the hose connections at the air conditioner service valves
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