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Senior High School Specialized Subject: Refrigeration and Air-Conditioning Servicing

Refrigeration and Air-Conditioning Servicing is one of the specialized subjects under the technical-vocational livelihood (TVL) career track. Some examples of the things that you will learn from taking this subject include:

  • Service and Maintain Window- Type Air-conditioning
    • Assembling and disassembling fan motor assembly in WAC
    • Proper servicing and maintenance procedures in fan motor assembly
    • Work Safety
    • Electrical/electric controls
    • Electrical symbols and schematic diagrams
    • Proper servicing and maintenance procedures in electrical power and control circuits
    • Diagnosing electrical controls
    • Determining terminals of electrical controls
    • Grounding
    • Electrical Safety / Hazards
    • Fundamentals of refrigeration cycle
    • Tracing of refrigeration circuit
    • Refrigerant system components and accessories
    • Operating parameters of refrigerant system
    • Diagnosing refrigerant circuit
    • Reprocessing of refrigeration system
    • Replacing defective components
    • Repairing refrigerant leak
    • Performing pressure leak test
    • Performing dehydration/vacuum procedures
    • Performing refrigerant charging
    • Types of lubricant
    • Types of refrigerants
    • Types of refrigerant oil
    • Safe handling of alternative refrigerants
    • Safety in handling nitrogen
    • Montreal Protocol
    • Ozone depletion substances (ODS)
  • Troubleshoot and Repair Domestic Refrigeration and Air-conditioning System
    • Electrical plans, symbols, and abbreviations
    • Interpreting diagram and details (schematic diagram)
    • Parts of refrigerant circuit
    • Manufacturer’s nameplate ratings
    • Electrical /mechanical system analysis
    • Troubleshooting chart, guide, and table
    • Diagnostic procedures in troubleshooting
    • Fundamentals of refrigeration and air conditioning
    • Electrical system analysis
    • Electrical parts, components, functions, and operations
    • Testing electrical component procedures
    • Troubleshooting electrical system procedures
    • Repair /replace electrical system procedures
    • Mechanical system analysis
    • Mechanical parts, components, functions, and operation
    • Mechanical troubleshooting and repair procedures
    • Electrical/Mechanical operating procedures
    • RAC Code of practice
    • Recovery/recycling procedures
    • Refrigerant cylinder calculation
    • Maintenance of recovery/recycling equipment /instruments
    • Alternatives refrigerant and lubricants, types, uses and selection
    • Retrofitting process
    • Safety precaution in retrofitting
    • Proper housekeeping
    • Accomplished Worksheet
    • Measuring air circulation and velocity
    • Velometer/ anemometer
    • Temperature testing
    • Thermometer
    • Current and voltage measurement
    • Clamp ammeter
    • Unit Operating Procedures
    • Pressure and Temperature Relationship

While studying, you will also be asked to demonstrate what you have learned by participating in class activities that may include the following:

  • Replacing defective fan
  • Diagnosing connections and wirings
  • Replacing defective power supply and electrical control
  • Replacing/repairing defective parts of the refrigerant circuit
  • Preparing inspection report
  • Familiarizing oneself with diagnostic procedures as stated in the service manual
  • Analyzing wiring diagrams based on charts and manufacturer’s manuals
  • Testing components following manufacturer’s manual, RAC Code of Practice, and/or enterprise troubleshooting policy
  • Diagnosing components for faults in line with manufacturer’s manual, RAC Code of Practice, and/or enterprise troubleshooting policy
  • Practicing safety precautions
  • Performing recovery/recycling operation according to manufacturer specifications
  • Performing retrofitting in accordance with manufacturer’s recommendation
  • Testing unit in line with troubleshooting procedures
  • Preparing report on repair and testing of unit conducted

These examples only cover the scope of the specialized subjects under the technical-vocational livelihood career track. For the scope of the core and contextualized subjects under the senior high school curriculum, please refer to their respective lists.

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