Why the copeland scroll compressor had locked rotor. 

+kjreinha Check my compressor playlist. There are other examples of copper plating. Tecumseh also has examples in their service manual. Hope this helps. GFM

the copper tubing?

***** Oil additives probably will make no difference. The problem here is contaminants in the system. They facilitate the plating. The copper piping is generally too far away from the compressor parts for them to provide the copper for plating. GFM

Its hard to say without disassembly, but probably a piece of the scroll broke off. GFM

Nope. The compressor is dead. GFM

Yes. Pretty ugly. Can only be a sloppy install. GFM

grayfurnaceman I don't know about green slime, but white slime is caused by a mix of different brands of oils

Moisture does cause acid. It also causes copper plating. Hermetic compressors are not used for refrigerant recovery. In the 1990s they were used for recovery with catastrophic results. The company I worked for had around 40 of these hermetic recovery units that failed. GFM

@@grayfurnaceman I heard of people using hermetic compressors for recovery or as vacuum pump (almost every HVAC techs here use it for that), they pour out the existing oil and replace it with air compressor oil so that it doesn't cause acid.

My father used a hermetic compressor for evacuation in the late 1960s. Recovery was not considered then. No service tech worth his salt would ever consider using a hermetic compressor for evacuation or recovery in the last 50 years. They simply do not do an effective job. A evacuation pump can bring the negative pressure to 20 microns. A compressor used for refrigeration is not required to or is it capable of that kind of numbers. GFM@@taiwanluthiers

brennanac1 I am assuming the unit is R-22. If the expansion device is overfeeding, the superheat would be non existent. Hope this helps. GFM

What refrigerant are you using? If it's R22 there's no way suction pressure can be 105. They top out at about 80 psi if you severely overcharge the system. If this is R410a then that suction pressure is about right, but the head pressure is too low. That points to weak compressor. It's also possible that the compressor is weak, because that's not a good compression ratio. My AC compressor was weak prior to locking up. It was making all kinds of weird sound trying to start up, and when it did start up it was LOUD, and the needle on the gauge was jumping (like it had trouble pumping). Yea suction pressure was a bit high, I tried to lower the suction pressure by recovering the refrigerant thinking I had overcharged it. Since my system was a mini split I had no way of knowing what the head pressure is, and so it doesn't tell me if it's a bad compression. I'd say get a new compressor.

+Gene Friedman There are some compressors that are oilless. Mostly diaphragm types. Everything out there is a balance. Longevity issues have made diaphragm types inappropriate. Cylinders need lubrication, so some oil must be pumped out. The scroll types pump even more oil than piston types. There may come a time when materials have advanced to where oil could be disposed of but it just has not happened yet. GFM

Actually, I don't think it would be much of a long time repair. Maybe to keep it running for a hot spell. GFM

grayfurnaceman If thats the case. does the compressor has to be replaced?

OCTAVIO FERNANDEZ If a compressor will not start(assuming the run cap is ok), sometimes you can get it to start with a start kit. I would tell the customer it will last from 10 minutes to 2 years. The compressor is failing. If the customer wants a little more time out of it, and is not bothered by having it fail with no warning, I would do it. GFM

Mine did not work with the start kit! Is just locked! Trane xl16i 2010