3516 A/C 1-1 and 2515 A/C 1-2 ~~~~~ 3516 A/C 1-1 and 2515 A/C 1-2. DT check found low coolant fault.  3516 A/c 1-1 checked - OK.    Found #3516 A/c 1-2 low coolant fault (10 psi). Charged freon to 40 psi. #2515 A/c 1-2 found low psi (20 psi). Charged freon to 40 psi. No freon leakage found at condenser pipings for both #3516 & #2515. Monitor at TIMS & both A/c able to cut in/out at 23'C.  Farid/Fazly 44365