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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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AC defrost
Hi,
I was troubleshooting my sister's donated old Viking window AC which she said wouldn't cool a couple summers ago. Found the defrost interruptor contact was open with traces of smoke on the case. I jumpered it and noticed the compressor seemed to be binding at every other start attempt. When it wouldn't start it tripped my powerbar's breaker so that explains why the defrost contact burned. The 25uF starting cap seems okay. It measures alright and low leakage. After a few careful starts the compressor now runs every time. I've heard of AC compressors locking up if not used for a very long time. I'm guessing the oil drains out of the bearings. It seems it will run fine from here on and it really cools fast. I'll just have to be careful about starting it next summer and use the powerbar with breaker. I have a couple of question's about the defrost contact. Is it simply a fail-safe device or is it needed to turn off the compressor as part of normal operation? Are these pretty generic? This one clips onto the cold end return and made by Klixon (Made in USA) # 20425F21-439-780 F56-3.0 6CV Not too sure about the F56-3.0 as it was smudged. It was held in place by a thick tape ressembling mastic, some kind of thermal insulation? TIA A*s*i*m*o*v .... [] - Please write your complaint legibly in that box. |
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