Confused about single phase compressor windings with an internal overload. If my overload is tripped which 2 windings would be open if windings are not identifiable. And when closed which would have the lowest ohm reading.
Or if someone has a good compressor diagnostics resource it would be great.....
start winding will have a higher ohm rating then the run winding. The highest ressitance on a good compressor will be between S and R.
C to S high reading
C to R low reading
R to S highest reading
If the comp is hot then wait for it to cool if you have an open winding then retest. If its still open when cool to the touch you either have a bad winding or an open overload that is stuck open. Either way on hermetic compressors you cant fix it if its open winding or stuck overload.
if your not sure after that then call out a tech.
If there is no resistance between the start and run terminals to common, but there is resistance between the start and run terminals, this means that the internal motor overload protection circuit is open. In this last case, allow the motor to cool and re-test it before replacing it.
Last edited by BigJon3475; 05-05-2007 at 08:45 PM.
thanks but what windings might be open with the overload, or is that dependent on the manufacturer.
read edit above.
Originally Posted by nedberger
think about it like this, the overload is "inline" with the common winding!