Table of Contents 752 Air Conditioning and Climate Control Section 3: A/C System Components Section 3 Topics ................................................................................. 31 Compressor Types ............................................................................. 32 Compressor Function ......................................................................... 32 Sliding Vanes ...................................................................................... 33 Sludging Valve .................................................................................... 33 Scroll-type Compressor ......................................................................
34 Circular Motion ............................................................................... 34 Suction ............................................................................................ 35 Compression .................................................................................. 35 Discharge ....................................................................................... 35 Swash Plate Compressor ................................................................... 36 Hollow Shaft Swash Plate Compressor ............................................... 37 Variable Capacity Compressor ...........................................................
38 Solenoid Control Valve .................................................................... 38 Solenoid Closed ............................................................................. 38 Solenoid Open ................................................................................ 39 Continually Adjusting ...................................................................... 40 Increasing Demand ........................................................................ 40 Decreasing Demand ....................................................................... 40 Magnetic Clutch ...............................................................................
41 DL Pulley ........................................................................................ 41 Magnetic Clutch .................................................................................. 42 Compressor Clutch Replacement ....................................................... 43 Compressor Clutch Circuit .................................................................. 44 ECM-Controlled Clutch ....................................................................... 45 Damper Limiter Pulley ........................................................................ 46 Diagnosis ............................................................................................
46 Compressor Lock Sensor ................................................................... 47 Sub-Cool Condenser with Modulator ............................................... 48 Modulator Desiccant Bag & Filter ................................................... 49 Receiver/Dryer ................................................................................ 50 Expansion Valve Operation ................................................................ 51 Traditional Design ............................................................................... 51 Block-type Design ...............................................................................
51 Expansion Valve Foam Insulation ....................................................... 52 Evaporator .......................................................................................... 53 Dehumidification ................................................................................. 53 Ejector Cycle System (ECS) Evaporator ............................................ 54 Two Sensing Methods ........................................................................ 56 Pressure-Sensing Circuits .................................................................. 56 Multi-Pressure Switch in the EWD ......................................................
57 Pressure Sensor ................................................................................. 58 Air Conditioning Mass Flow Sensor ..................................................... 59 Gaskets & O-rings .............................................................................. 60 Tightening Fittings .............................................................................. 60 Quick Disconnect Fittings ................................................................... 61 ii Technical Training