Air conditioning systems with refrigerant R134a - General information

Chapter overview

• Technical data
  1
• 1 Safety information
  1
• 1.1 Safety precautions when working on air conditioning systems
  1
• 1.2 Safety precautions when working on high-voltage system
  2
• 1.3 Safety precautions when working in the vicinity of high-voltage components
  2
• 1.4 Safety precautions when tow-starting or towing
  3
• 2 Repair notes
  4
• 2.1 Rules for cleanliness when working on high-voltage system
  4
• 3 General information on air conditioning
  5
• 3.1 Other reference material
  5
• 3.2 Basics of air conditioning technology
  5
• 3.3 Vapour pressure table for refrigerant R134a
  7
• 3.4 Refrigerant R134a
  8
• 3.5 Properties of refrigerant R134a
  9
• 3.6 Refrigerant oil
  11
• 3.7 Comfort
  12
• 3.8 How air conditioning works
  13
• 3.9 General work safety
  13
• 3.11 Basics for working on refrigerant circuit
  17
• 4 General information on refrigerant circuit
  20
• 4.1 Components of refrigerant circuit
  20
• 4.2 Design of refrigerant circuit
  31
• 4.4 Switches and senders in refrigerant circuit and related connections
  34
• 4.5 Electrical components not installed in refrigerant circuit
  39
• 4.6 Pressures and temperatures in refrigerant circuit
  42
• 4.7 Refrigerant circuit with expansion valve
  42
• 4.8 Refrigerant circuit with restrictor and reservoir
  44
• 4.9 Test and measurement work that can be performed using a pressure gauge
  46
• 4.10 Air conditioner service and recycling equipment
  47
• 4.11 Notes to repairs on refrigerant circuit
  48
• 5 Laws and regulations
  49
• 5.1 Laws and regulations
  49
• 5.2 Recycling and refuse law
  54
• 5.4 Maintaining records on refrigerant
  55
• 6 Refrigerant circuit
  56
• 6.1 Important repair notes on air conditioning
  56
• 6.2 Converting refrigerant circuits from R12 refrigerant to R134a
  56
• 7 Working with the air conditioner service station
  57
• 7.1 Important instructions for working with the air conditioner service station
  57
• 7.2 Connecting a air conditioner service station for measuring and testing
  58
• 7.3 Drain the refrigerant circuit using the air conditioner service station
  59
• 7.4 Evacuating refrigerant circuit using air conditioner service station
  59
• 7.5 Filling refrigerant circuit with air conditioner service station
  61
• 7.6 Bringing air conditioning system into service after charging
  62
• 7.7 Charging the container in the air conditioning service station with refrigerant
  62
• 7.8 Emptying air conditioner service station
  63
• 8 Detecting leaks in refrigerant circuit
  64
• 8.1 Leak detection in refrigerant circuit using compressed air or nitrogen
  65
• 8.2 Searching for leaks in refrigerant circuits using leak detector V.A.G 1796
  66
• 9 Clearing refrigerant circuit of contaminants
  75
• 9.1 Vehicles with high-voltage system (hybrid vehicles)
  75
• 9.2 Blowing through refrigerant circuit with compressed air and nitrogen
  76
• 9.3 Flushing refrigerant circuit with refrigerant R134a
  78
• 10 Clearing refrigerant circuit of contaminants, commercial vehicles
  110
• 10.1 Vehicles with high-voltage system
  110
• 10.2 Flushing refrigerant circuit with refrigerant R134a
  111
• 10.3 Adapters for setting up flushing circuits
  111
• 10.4 Procedure for setting up and flushing refrigerant circuit, Amarok 2010 ►
  115
• 10.5 Procedure for setting up and flushing refrigerant circuit, Caddy 2004 ►
  121
• 10.6 Procedure for setting up and flushing refrigerant circuit, Crafter ►2017
  128
• 2020 ►
  162
• 11 Complaints
  178
• 11.1 Possible complaints about refrigerant circuit
  178
• 11.2 Odours from heater and air conditioning unit
  179
• 12 Connecting the air conditioning service station
  182
• 13 Checking pressures on vehicles
  183
• 13.7 With expansion valve, receiver and electrical air conditioner compressor
  213
• 14 Renewing components
  214
• 14.2 Renew the air conditioner compressor
  217
• 14.3 Replace receiver or reservoir and restrictor
  219
• 15 Testing equipment and tools
  222
• 15.1 List of test equipment, tools and materials
  222