Basic Refrigeration Cycle

Overview

• The refrigeration cycle is divided into two sides:
  • High Pressure, High Temperature Side (Red Side)
  • Low Pressure, Low Temperature Side (Blue Side)
• Two main components separate high and low pressure sides:
  • Compressor: Increases refrigerant pressure and temperature.
  • Metering Device: Lowers refrigerant pressure and temperature.

Refrigeration Process

1. Compressor:
   • Low pressure, low temperature vapor refrigerant enters.
   • Equipped with a reciprocating compressor.
   • Output: High pressure, high temperature vapor refrigerant.
2. Condenser Coil:
   • High pressure, high temperature discharge gas enters.
   • Refrigerant rejects heat to the outdoor air.
   • Transforms into high pressure, high temperature liquid refrigerant.
   • Sub-cooled liquid refrigerant travels through the liquid line and filter dryer.
   • Filter Dryer:
     • Absorbs water vapor to prevent compressor damage.
3. Metering Device:
   • Receives high pressure, high temperature sub-cooled liquid refrigerant.
   • Lowers pressure converting refrigerant to low pressure liquid state.
   • Results in 80% liquid, 20% flash gas (slightly vaporized).
   • Saturation Point:
     • Phase change where liquid and vapor exist, allowing heat absorption.
4. Evaporator Coil:
   • Absorbs heat energy as air blows across.
   • Outputs: Low pressure, low temperature vapor refrigerant.
5. Cycle Continuity:
   • Vapor refrigerant re-enters the compressor, restarting the cycle.

Important Considerations

• Compressor must handle vapor refrigerant only to prevent damage.
• Issues such as blower motor failure can lead to saturated refrigerant and compressor damage.

Additional Resources

• Website: acservicetech.com
• Available materials:
  • Refrigerant Charging and Service Procedures for Air Conditioning Books
  • Thousand Question Workbook for self-study
  • Quick reference cards, PT charts, and methods for checking charge
• Resources are also available on Amazon.

Remember to utilize resources to enhance understanding of air conditioning systems and troubleshooting techniques. Visit the website for detailed guides and educational materials.

Next Steps:

• Review the basic cycle components and their functions.
• Practice troubleshooting common issues using provided guides and workbooks.