Electronic Leak Detection Method

Electronic Leak Detection Method


TOOLS REQUIRED
J 39400-A Halogen Leak Detector

Use the electronic leak detector when inspecting for refrigeration system leaks. This unit operates on a 12 volt DC. The leak detector provides an audible signal which increases in frequency when a refrigerant leak is detected. Properly calibrate the tool. Use the tool at the proper setting for the system that you are testing. The electronic leak detector has the following three settings:
^ R-12
^ R-134a
^ Gross leaks
This setting isolates very large leaks that are found at one of the other settings

The halogen leak detectors are sensitive to windshield washing solution, many solvents and cleaners, and some adhesives. Work on a clean and dry surface. Complete the following actions when you test the joints:
^ Completely circle each joint.
^ Move the tool 25 - 50 mm (1 - 2 inch) per second.
^ Ensure that the tip of the probe is no more than 6 mm (0.25 inch) from the surface.
You may use this detector in order to test the following joints:




1. Inspect the refrigerant pressure sensor.




2. Inspect the service valves.




3. Inspect the lines.
4. Inspect the evaporator inlet/outlet.
5. Inspect the accumulator dryer inlet/outlet connections.
6. Inspect the compressor rear head.
7. Inspect the housing joints.
8. A leak is indicated when the audible tone goes from a steady 1-2 clicks per second to a solid alarm. Adjust the balance knob frequently in order to maintain the 1-2 clicks per second.
If a leak is not found, proceed to the Refrigerant Leak Diagnosis table: