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Page Title: REFRIGERATION SYSTEM SERVICE - LEAK-TEST
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TM  10-4130-239-14 5-6. REFRIGERATION SYSTEM SERVICE - LEAK-TEST. This task covers: Leak-testing Equipment Condition Para Condition Description 2-8 Engine  stopped. 4-15 Housing  removed. Tools Tool Kit, Service Refrigeration, item 5, Appendix B 5-8, Steps System charged to 50 psig 1-3 minimum if needed. Materials/Parts: Dry nitrogen, item 11, Appendix E Bubble, liquid type, item 7, Appendix E R-12  Refrigerant,   item 24, Appendix E 1. Attach nitrogen tank to manifold gauges. 2. Open valve and apply 300 psig to refrigerant system. NOTE Two leak detection methods are recommended depending upon the estimated size of the leak. Different  techniques  are  used  for  detection. Under certain conditions a large leak may mask a smaller leak and both techniques may be required. The larger leak is searched for first. Regard- less of the size of the leak, the system must now be pressurized with refrigerant vapor, to the pressure of the refrigerant tank, using the charging  manifold  described  previously. The pressure obtained will be the vapor pressure of R-12 and a function of the ambient temperature, probably in the order of 50-140 psig. Turn off the valve on the service manifold. 3. To detect large leak start with the liquid bubble type leak detector, and apply moderate quantities at each SAE fitting, tubing or hose connection. Leaks greater than 0.04 cc per hour will appear as a series of bubbles. 5-12

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