Electronic Leak Detection Method
Electronic Leak Detection MethodTOOLS REQUIRED
J 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 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 1 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. Check the refrigerant pressure sensor.
2. Check the service valves.
3. Check the lines.
4. Check the evaporator inlet/outlet.
5. Check the accumulator dryer inlet/outlet connections.
6. Check the compressor rear head.
7. Check 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.
Leak Testing:
If a leak is not found, proceed to the Refrigerant Leak Diagnosis table: