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Thread: R134a Blockage
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27-11-2001, 06:56 PM #1
R134a Blockage
Has anyone come across capillary blockage using R134a.
A large Amana fridge/freezer only 10 months old has given up the ghost. First signs of trouble was ice in the milk and then total defrost. Had a line tap on the thing and registered suction pressure @ -20psig!. No loss of charge and after recovering couldn't get nitrogen all around the system. Seems that the capillary is well and truely blocked.
Spoke to a friend engineer and he said that in his experience this had happened quite a lot on his jobs and it appears that the gas causes the oil to floc and the capillary then "grows" a lining until there is just no free space left.
My theory is that the compressor was left open for a long time during installation at the factory and the oil has been contaminated with moisture. Can't be sure though as I haven't had the compressor out yet to do an acid test or oil test.
Any thoughts or experiences would be welcome
frank
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