Electronic Leak Detection Method
TOOLS REQUIREDJ 39400-A Halogen Leak Detector
Use the electronic leak detector when inspecting for refrigeration system leaks. This unit operates on a 12 volt DC and provides an audible signal which increases in frequency when a refrigerant leak is detected. Properly calibrate the J 39400-A to instructions and use at the proper setting for the system being tested. The electronic leak detector has the following three settings:
^ R-12
^ R-134a
^ Gross leaks - for isolating very large leaks already 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. The following joints may all be tested using this detector, each joint being completely circled moving at 1-2 inches per second with the tip of the probe no more than 6 mm (0.25 in) from the surface:
1. Inspect the refrigerant pressure sensor
2. Inspect the service valves
3. Inspect the line fittings
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. The balance knob should be adjusted frequently in order to maintain the 1-2 clicks per second.
If a leak is not found, proceed to the Refrigerant Leak Diagnosis table.