Do I need to refill the refrigerant (freon gas=R22) to the compressor unit?
No, all our units are pre-fill the refrigerant in the compressor, which every unit is allowing the tubing to 25′ (7.5m), if your indoor and outdoor units are between more than 25′ long tubing which you will need too refill the refrigerant in the compressor to bring up the cooling and heating efficiency. For the volume of the refrigerant R22, which is 2.82 lbs (45.12oz) standard in the compressor. The Refrigerant (R22) pressure is 145~150psi.