FATC H. PTC HEATER ................................................................................................................... 32 20. REFRIGERANT HOSES / PIPES.......................................................................................... 33 21. DO’S AND DONT’S .............................................................................................................. 34 22. TROUBLESHOOTING .......................................................................................................... 35 23. MAINTAINANCE................................................................................................................... 48 23.1. PRELIMINARY INSPECTION....................................................................................... 48 A. AC SYSTEM PERFORMANCE TEST........................................................................... 48 B. LEAK DETECTION ....................................................................................................... 50 23.2. REGULAR MAINTAINANCE ........................................................................................ 50 A. REFRIGERANT RECOVERY, RECYCLING AND RECHARGING................................ 50 B. FLUSHING OF AC SYSTEM ........................................................................................ 51 C. REPLENISHING COMPRESSOR OIL .......................................................................... 52 D. PRESSURE TEST USING MANIFOLD GAUGES......................................................... 53
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