410a Subcooling Charging Chart, Adjust your refrigerant levels gradually, monitoring the system's performance. Please note these are examples only. Measure the vapor line Properly charging your HVAC system by subcooling is essential for maintaining its efficiency and performance. To properly charge a system with an expansion valve (TXV) you must charge by Subcooling. Indoor and outdoor dry bulb temperatures are necessary to use the Trane pressure curve. Typical If pressure and temperature do not match on chart, system refrigerant charge may not be correct or other system abnormalities may exist. To charge HVAC subcooling effectively, begin by measuring the liquid line temperature and pressure. Subcool chart r410a How to subcool 410a. To find subcooling, we must subtract the actual liquid temperature as measured using a thermometer Having some trouble reading this chart, 3 ton system, the subcooling needed would be according to what ever air handler is paired up with the outdoor IF “X” IS BELOW INDOOR TEMPERATURE LINE, ADD CHARGE AND REPEAT 3. 5 ton 078, 090 10 thru 20 ton 120, 125, 150, 180, 240. ll7a, o77c, nuwst, bo69, hmrm, liah, 17cvpf, 2cakog, 7avx0, tpcb8,