copeland scroll durability

[Third_techtrio]

I need some help about the durability of this Copeland scroll compressors. We replaced our old copeland reciprocating compressors with these new Copeland Scroll compressor as per recommendation by the supplier because this new compressor is more energy efficient and there is no more available copeland recip in the market. The problem is that, out of 5 compressor we have replaced 2 of them are already defective, because of this busted ASTP (Advanced Scroll Thermal Protector) that supposed to protect the compressor. When it automatically suspend the compressor pumping due to high head temperature and after letting it cool for a day, this ASTP never reset back and the compressor never got back its pumping action even though its motor runs continuously. Just want to know from refrigeration Guru's out there if they have encountered something like it and any recommendation, especially other brand of compressor. By the way, the compressor model is ZR94.

[desA]

Just how high did the discharge temperature go?

Please supply your refrigerant & operating conditions, so that we can better assist you.

Does sound pretty unusual, as these compressors are usually pretty solid.

[monkey spanners]

I've fitted a few copeland scrolls to replace thier obselete recip compressors and haven't had any trouble with them.
maybe the problem is the high discharge temps they had been running with.

I have also fitted L'unite/Techumseh compressors in place of Copelands where price was more of an issue.

[Third_techtrio]

I never actually have the chance to acquire the discharged pressure/temperature of the unit but our post finding of one of the system that we have just replaced last couple of months ago with new compressor with the astp(advanced scroll temp protector) was that the liquid line filter-drier was partially restricted that may ave cause the high head pressure/temperature. My concern is that this thermal protector on mechanical side of the compressor should have reset to normal after the compressor have cooled down.

[tonyhavcr]

]I never actually have the chance to acquire the discharged pressure/temperature[/B] of the unit but our post finding of one of the system that we have just replaced last couple of months ago with new compressor with the astp(advanced scroll temp protector) was that the liquid line filter-drier was partially restricted that may ave cause the high head pressure/temperature. My concern is that this thermal protector on mechanical side of the compressor should have reset to normal after the compressor have cooled down.

Not a dig BUT how do you replace a compressor with-out acquire the discharged pressure/temperature of the unit?

(My concern is that this thermal protector on mechanical side of the compressor should have reset to normal after the compressor have cooled down.)

Yea so it should reset - Why did it open !

[desA]

Yea so it should reset - Why did it open !

A point to add:

How many times did the thermal overload have to open/close before the technicians were called out to the site?

Was this a once-off occurrence, or did it happen many times?

[Third_techtrio]

Yeah, the cut-off of astp occurred just once. I did not have the chance to test-run the unit because its astp did not reset.