copeland scroll compressor

[shyju]

Sir,
we replased a new scroll compressor,model no.ZR108KC-TF5-522,LRA225.We fixed the compressor and start,then it was running and taking around 21amps and that time the suction pressure was around 20psi, and start to charge more gas to the unit suddenly compressor stop pumping and only motor was running and reduce the ampare around 14amps.we also changed discharge piping for reduse the hindrense.So please tell us the reason

[monkey spanners]

If the system was undercharged at the time it stopped pumping it could have been due to the compressor over heating, i think they have a combined over pressure and over temperature device inside that bleeds pressure from the discharge into the suction to prevent the compressor working outside its designed conditions.
Eventually if left running like this it will trip its internal klixon or thermistor and shut down till it cools.
I could be wrong though as your compressor sound much bigger than the ones i have worked on and fitted.

What caused the original compressor to fail?