Charge System. Open tank valve. Refrigerant tank. Charge liquid through high side. Compressor is OFF. 404A. Purge hose. Use refrigerant scale. Scales. CONDENSER. Compressor. EVAPORATOR. TEV. Sight Glass. Receiver. Filter Drier. © 2004 Refrigeration Training Services R1 Subject 3 Recovery, Evacuation, Charging v1.2.