Table of Contents Air Conditioning for Collision Repair Section 4: Refrigerant Section 4 Topics ................................................................................. 31 Cross-Contamination .......................................................................... 32 Identifying Refrigerant ......................................................................... 32 Refrigerant Recovery .......................................................................... 33 Recovery, Evacuation, & Recharging Unit Functions .................................................................................
33 Equipment Variations ...................................................................... 33 Recovery Operation ........................................................................ 33 Service Fitting ................................................................................. 34 Recycling ........................................................................................ 34 Lubricating Oil ..................................................................................... 35 Oil Replacement ................................................................................. 36 Example: Replacing Compressor ................................................... 36 Example:
Replacing Condenser ..................................................... 36 Evacuation .......................................................................................... 37 The 30-30 Rule ............................................................................... 38 Recharging .......................................................................................... 39 Leak Detection .................................................................................... 40 Visual Inspection ............................................................................. 40 Leak Detectors ................................................................................
40 Leak Testing Dyes .......................................................................... 41 Sealants .......................................................................................... 41 Final Inspection ................................................................................... 42 Inspect Operation ........................................................................... 42 Check Outlet Temperature ............................................................. 42 Section 5: Symptoms / Section 5 Topics ................................................................................. 45 Symptoms of Significant Undercharge ...............................................
46 Symptoms of Overcharge ................................................................... 47 Symptoms of Defective Compressor .................................................. 48 Symptoms of Frozen Expansion Valve ............................................... 49 Diagnosis Section 6: Reference: AC System Basics Section 6 Topics ................................................................................. 51 Refrigerant Cycle ................................................................................ 52 System Operation ...............................................................................
53 Expansion Valve Operation ................................................................ 54 Traditional Design ........................................................................... 54 Block-type Design ........................................................................... 54 Evaporator .......................................................................................... 55 Dehumidification ............................................................................. 55 Compressor Types .............................................................................. 57 Compressor Function .....................................................................
57 Magnetic Clutch .................................................................................. 58 Damper Limiter Pulley ......................................................................... 59 Diagnosis ........................................................................................ 59 Electric Inverter Compressor .............................................................. 60 Similar Construction ........................................................................ 60 ii Collision Repair & Refinish Training