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Detecting leaks on the refrigerant circuit with the leak detectorVAG1796 > < Leak detection on the refrigerant circuit

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Leak detection on the refrigerant circuit with compressed air or nitrogen
Leak detection on the refrigerant circuit with compressed air or nitrogen
A major leak can be determined, for example, if a pressure of maximum 15 bar builts up in the refrigerant circuit with clean and dried compressed air or with nitrogen.
  Note
t  If a major leak is suspected, do not fill the refrigerant circuit with the refrigerant R134a.
t  If the leak is large enough, noise can be heard at the leak point which is produced by the escaping air or gas.
   
t  The compressed air or the nitrogen enters via the service connection.
  V87-1468
t  The quick-coupling adapter for the service connections can be connected to the workshop compressed air system for example with a changed filling hose -A- (e.g. with a thread 5/8"-18 UNF, depending on the thread at the quick-coupling adapter) and with a suitable adapter -B-.
t  Compressed air test - in addition use a combination fine-filter unit for the compressed-air system, oil, dirt and water separator (as is common for painting systems). It must be installed between the compressed-air system and the filling hose -A-.
  V87-1469
t  Nitrogen test - connect a compressed gas bottle filled with nitrogen -3- by means of a pressure gauge battery with pressure reducer for nitrogen (maximum reduced pressure: 15 bar) -1- via a filling hose -2- (e.g. with a thread 5/8"-18 UNF) to the service connection (on which a quick-coupling adapter for service connections has been connected) at the closed refrigerant circuit.
–  Slowly increase the pressure in the refrigerant circuit to max. 15 bar.
  WARNING
t  The maximum permissible working pressure is 15 bar.
t  For leak detection with nitrogen, only work with pressure reducer for nitrogen bottles.
t  Nitrogen may leak uncontrollably from the bottle.
–  It is possible to determine the leak point by the noise which occurs at the point where the gas (nitrogen) escapes or by applying a coat of soapy water to the leak point.
–  Eliminate the leak.
  Note
There must be no pressure in the refrigerant circuit before connecting to the A/C service station. The nitrogen and the compressed air must not enter the service bottle with the refrigerant R134a.
–  After eliminating the leakage, connect an A/C service station and check the refrigerant circuit for tightness by performing a vacuum test.
–  If a minor leak is suspected (according to the vacuum test), subsequently carry out a leak check using the leak detector -VAG1796- → Chapter, if necessary the leak detection system -VAS 6196- → Chapter.
–  The refrigerant circuit can only be filled once the leak check has been performed successfully.
  V87-1244

Detecting leaks on the refrigerant circuit with the leak detectorVAG1796 > < Leak detection on the refrigerant circuit