#2644 AC-2 Unable to charge refrigent To ~~~~~ 2644 A/C 2-1 HP-100 PSI, LP-40 PSI before charging. Check CCU shut off valve in open position. Drained freon to LP-30 PSI, HP-90 PSI and recharge freon to LP-45 PSI, HP-110 PSI ok. A/C 2-2 LP-20 PSI, HP-70 PSI low freon, check CCU shut off in open position. Charge freon to LP-45 PSI, HP-110 PSI and monitor pressure steady. Final conclusion is A/C 2 both unit was able to charge freon with no issue. A/C function-ok. Done by: Koh and Sanip