1. SYSTEM COMPONENTS CHAPTER 5page 91C & 93 L

2. OBJECTIVES l IDENTIFY AND COMPARE THE STATE OF REFRIGERANT IN EACH SECTION OF A/C SYSTEM. l EXPLAIN PURPOSE OF SYSTEM COMPONENTS. l COMPARE THERMOSTATIC EXPANSION VALVE TO FIXED ORIFICE VALVE. 93C & 91L

3. ORIFICE TUBE SYSTEM

4. EXPANSION VALVE SYSTEM

5. OPERATION OF COMPONENTS

6. Compressor l Refrigerant Pump l Increases Pressure and Temperature l Several Types l Separates High and Low sides of system l Oil is stored in crankcase (sump)

7. Compressor Malfunctions l Malfunctions evident following ways; –Noise –Seizure –Leaks –High inlet and low discharge pressure

8. Discharge Hose l CONTAINS HIGH PRESSURE. l SYNTHETIC RUBBER WITH NYLON BARRIER LINING. l 13/32 ID. l PREFORMED METAL ENDS WITH FITTINGS.

9. Condenser l Liquefies heat laden vapor. l Receives Maximum Air flow. l Hot vapor enters top of condenser. l Hot Liquid leaves bottom of condenser. l Refrigerant flows through condenser coils and transfers heat to coils and fins. l Fins transfer heat to air passing over them. 96C & 97C 109L

10. Conventional Tube and Fin l Parallel Two Path. l Mechanically expanded tube to fin joints. l Circular Tubes.

11. Multi-Louver Fin Design l Manifolded Multi-path refrigerant flow.

12. Serpentine Tube and Center Condenser l Brazed tube to fin joints. l Flat Tubes. l Parallel two path flow.

13. Evaporator l Dehumidifies the airstream. l Under ideal conditions, refrigerant boils to complete saturation 3/4 of the way through Evaporator. l Flooded evaporator means is full of liquid refrigerant with no room for expansion. l Starved evaporator means all refrigerant is boiled in the first quarter of the evaporator. 100C & 110L

14. Receiver Drier l Located between condenser and metering device l Assures only liquid reached expansion valve l Contains a chemical drying agent (Desiccant) 96C & 110L

15. Hoses and Lines l NOTICE: Do not use wormgear style clamps for repairing leaks in Nylon barrier hose fittings. Always repair Nylon barrier hose with the appropriate bubble style crimp fitting. 103C 98L -102L

16. Liquid Lines l Condenser to the metering device l 5/16 or 1/4 inch ID. l Made of rubber, nylon, copper, steel or aluminum. l Contains high pressure liquid! l Has sight glass

17. Thermostatic Expansion Valve l Located on inlet side of evaporator. l Used to control evaporator temp. l Variable orifice can vary on pressure, temperature or both. l Can malfunction in open or closed position. 98C 102L

18. H-Valve l Is a Expansion Valve: Chrysler 1979 and later. l Has internal sensing bulb for low side temperature. l Low Pressure Cut Out Switch for low R-12 Charge. l Thermostatic Switch Senses Evap temp to control clutch operation. 99C & 104L

19. Valves In Receiver (VIR) l Three different components –TXV –Receiver/Drier –Pilot-operated- absolute suction throttling valve l Compressor runs all the time. Page 95C

20. Orifice Tube l Calibrated Restrictor l Different color = different Orifice size. l Mesh Filter Screen. l Meters refrigerant into evaporator as low pressure liquid. 100C & 105L - 107L

21. Accumulator l Located between evaporator and compressor. l Primary function is to separate the vapor from the liquid and oil. l Location for desiccant. 102C & 107L

22. That’s All Folks!!!