3512 a/c 1-1, 2-1 , 1512 a/c 1-2 Coolant ~~~~~ 3512 a/c 1-1, 2-1 , 1512 a/c 1-2 Coolant     #3512 A/C 1-1,2-1 & #1512 A/C 1-2 having low freon.Checked CCU for leaks,no leaks observed.Top up freon on cars: #3512 a/c 1-1,LP=35psi & HP=110psi. #3512 a/c 2-2,LP=35psi & HP=120psi. #1512 a/c 1-2,LP=40psi & HP=110psi. Monitored a/c cut in/out ok.LP & HP pressure stable. Done by kumar/Jack/Sateesh/Koh. 9/06/20