Self Study Program 110 – Refrigerant R1234yf for air conditioning systems in SKODA AUTO vehicles

VAG SSP 110. The EU Directive 2006/40/EC relating to emissions from air conditioning systems in motor vehicles places new demands on refrigerants used in car air conditioning units. In response to this Directive, ŠKODA AUTO has been using a new refrigerant in its vehicles, R1234yf, since mid- 2016.

The respective components of the air conditioning circuit need to be adapted to the new refrigerant, and this self-study material provides more details in this respect. Automotive air conditioning systems account for as much as 40% of all air conditioning systems worldwide. The use of this environmentally-friendly refrigerant in car air conditioning systems will substantially reduce greenhouse gas emissions.

CONTENTS

• 1. Introduction
  • 1.1 AC refrigerant-related measures arising from new emission legislation
• 2. Key AC principles
  • 2.1 Glossary
  • 2.2 Refrigerant circulation in a closed AC circuit
• 3. Refrigerants – overview
  • 3.1 R12
  • 3.2 R134a
  • 3.3 R1234yf
    • 3.3.1 Comparison – CFC/HFC/ HFO environmental impact
    • 3.3.2 Comparison R134a/R1234yf global warming potential
    • 3.3.3 Comparison – R134a/R1234yf properties
    • 3.3.4 R1234yf – reactions with metals and plastics
    • 3.3.5 R1234yf – colour and odour
    • 3.3.6 Comparison R134a/R1234yf vapour pressure
      • 3.3.6.1 R1234yf – temperature-dependent saturated vapour pressure
    • 3.3.7 R1234yf – flammability
    • 3.3.8 R1234yf – storage and handling safety
• 4. Refrigerant oil
  • 4.1 AC oil – distribution
  • 4.2 AC oil – quantity
  • 4.3 AC oil – type
• 5. Service ports
• 6. Warning label for the AC cooling circuit
• 7. MQB inner heat exchanger
• 8. AC system changes in connection with the transition to the new refrigerant – R1234yf
  • 8.1 AC system changes in the ŠKODA Fabia and ŠKODA Rapid lines
  • 8.2 MQB AC system changes in the ŠKODA Octavia and ŠKODA Superb lines
  • 8.3 AC system changes in the ŠKODA Yeti line
  • 8.4 AC system changes in the ŠKODA Citigo line
• 9. AC compressor
  • 9.1 Types of compressors in use
    • 9.1.1 Table – AC compressors used in ŠKODA vehicles
    • 9.1.2 AC compressor with inner pressure control valve and electromagnetic clutch
      • 9.1.2.1 Electromagnetic clutch in the AC compressor
    • 9.1.3 Externally controlled AC compressor with inner electromagnetic control valve
• 10. AC evaporator
• 11. AC condenser
• 12. Service stations for AC systems with R1234yf
  • 12.1 Service stations for R1234yf – characteristics
  • 12.2 Service centre safety concept for R1234yf
  • 12.3 AC service station VAS 581 00140
  • 12.4 AC service station VAS 581 00341

For assembly, disassembly, repair and diagnostics instructions, as well as detailed user information see VAS diagnostics devices and safety sheets.
Closing date – 5/2016.
This Workbook is not subject to updates.

Language: English
Format: PDF
Pages: 44

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