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Category IV

  • F Gas Regulations Certification


To prepare Category IV engineers for the new updated F Gas qualification – City & Guilds 2079


By the end of this topic you will be able to:

  • Describe the International System of Units (SI) applicable to the refrigeration industry
  • Explain reasonable operating temperature differences for condensers and evaporators.
  • State the four stages of the basic vapour compression cycle, and describe their structure and function.
  • Explain the relationship between pressure and temperature, and its effect on the heat transfer properties of a refrigerant.
  • Explain how heat is transferred during the evaporation and condensation stages of the vapour compression cycle.
  • Define the terms sensible heat, latent heat, subcooling and superheat.
  • State how the phase change of zeotropic fluids is different to standard single substance or azeotropic blend refrigerants.
  • State how key international Protocols and Regulations directly affect the refrigeration industry.
  • List the contents required in plant/system records.
  • Pre-requisite Study:

  • None

Areas covered in this module:

  • International System of Units
  • Vapour Compression Cycle
  • General characteristics of zeotropic blends
  • Protocols and Regulations
  • Ancillary components
  • Maintaining records
  • Refrigerant handling hazards
  • Quiz
FG04 - Cat IV Certification FREE
Available on request.