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True frezer is loosing charge in 3 days cant hear leak with nitrogen and has dye in it but looses charge in 3 days what is the best way to find the leak

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Hi, be sure you are putting enough pressure with the nitrogen tank and get your self a bottle of gas leak detector at any hardware store, soap up all the fittings you can get to. About 200 p.s.i. of pressure will force the leak. When a unit leaks, it will leak at the weakest link on a system, so the weakest is the valve stems where you charge it. If you have added a dye solution, do you have the blue light that comes with the dye kit to find the leak? I will bet if you are loosing freon at that rate, you have a leak in the evaporator coil. I leak check units every day, and if you have soaped down all of the lines, fittings and so on, 95% of leaks I find are in the evap. coil. Check the cap tube, as a lot of times I have found leaks from them rubbing against any metal parts and rubbing a hole in the line due to vibration from the compressor. If you are using dye, you need the U.V. lamp to scan all parts to find the leak, you can't see the dye with your eyes, only when its dark and with the uv, ultra violet light to see it. It will show up a yellow color. Pay good attention to where the liquid line feeds the evaporator coil and the capillary tube are insulated. You may have to peel it off, sometimes I have found the leak under the insulation. A box that size does not hold a lot of freon, so get to the evaporator coil, use the U.V. light, and get the soap, it works wonders for leak detection. Please let me know. I will wait to hear back from you. Good Luck, you will find it!!
Shastalaker7
A/C, Heating, & Commercial Refrigeration Contractor
PS, when using the U.V. lamp, get a tarp to put over you to keep it as dark as you can. Scan areas at least 2 to 3 times.

Posted on Mar 14, 2011

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