Please help me to find the run / start / common in compressor , thank you:confused: :confused: :confused:

If you have the compressor specifications, you can look up what the winding resistance and then measure the winding to compare them but in most cases this information is not readily available. As long as you under stand how the windings are configured. There are only 3 possible readings you can take on the 3 terminals. Run winding will be the lowest ohm reading, the start winding next higher, and both windings combined will be the highest and should be equal to the sum of the other two.

If the reading on S to R is less than the sum, then an electrical short exist between the run and start windings. If one winding reads open or infinite then winding is damaged and the compressor needs to be replaced. If the readings from S to R is 8 Ohms and C to R is open and C to S is open, the internal overload is open. If this all checks out then the compressor is likely OK electrically NOTE: these are arbitary numbers and are not to be used in determining the actual basis of the impedance of your compressor windings.



The image below is a common layout for compressor terminals BUT that is no guarantee this is the layout for yours. It is just an example.

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Originally Posted by rayachi

PLEASE HELP ME TO FIND THE RUN / START / COMMON IN COMPRESSOR , THANK YOU:confused: :confused: :confused:

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Can u give me an example for more explanation , sorry about that thank you mr hvac1000

This is all I have if you cannot figure out what I posted then you should stop working on your system and call a professional. What I posted is very clear and concise. You may have to go to the library and see what they have to offer on this subject.