Electronic Leak Detection Method
TOOLS REQUIREDJ 39400-A Halogen Leak Detector
Use the electronic leak detector when inspecting the system for refrigeration system leaks. This unit operates on a 12 Volt DC. This unit provides an audible signal which increases in frequency when the unit detects a refrigerant leak. Properly calibrate the tool according to instructions. Use the tool at the proper setting for the system that you are testing. The electronic leak detector has the following 3 settings:
^ R-12
^ R-134a
^ Gross leaks - for isolating very large leaks that are already found at one of the other settings
The halogen leak detectors are sensitive to windshield washing solution, many solvents, 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 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. The balance knob should be adjusted frequently in order to maintain the 1-2 clicks per second.
Steps 1-7:
If a leak is not found, proceed to the Refrigerant Leak Diagnosis table.