Liquid Pressure (psig)
500
475
Remove refrigerant when above curve 
450
425
400
375
350
325
300
275 
Add refrigerant when below curve 
250
7075 80 85 90 95 100 105 110 115 120 125
Liquid Temperature (° F)
Figure 4. Charging Chart for 3 Ton Units
Liquid Pressure (psig)
500
475
Remove refrigerant when above curve 
275
Add refrigerant when below curve 
250 
70 75 80 85 90 95 100 105 110 115 120 125
Liquid Temperature (° F)
Figure 5. Charging Chart for 4 Ton Units
10
