3720 AC 1-1 coolant pressure fault. ~~~~~ 3720 AC 1-1 coolant pressure fault.     Check a/c 1-1 freon pressure low side zero and high side 100psi during a/c compressor running(short cycling)Drain freon and vaccum till zero and pump freonfault still remain.Suspect AHU chock.Check a/c compressor motor (U,V,W) and condensor fan resistance ok.To follow up to replace AHU. 0020 Raise to follow up. Done by Sanip/Faddzal,Firdaus. 28/07/20 3720 AC 1-1 EVAP.CHOKED     #3710-A/C 1 evaporator change out done.Chatge freon on a/c 1-1 (LP=40psi,HP=120psi) & a/c 1-2(LP=40psi,HP=120psi) #3720 a/c 1 able to cut in & out.no sign of leak.Monitor for 1 hour,a/c operation ok. AHU-New s/n: 331247  Old s/n: 634116 Not: 2185374 Done by Sanip/Koh/Jack/Zulqarnain. 02/08/20