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03-08-2011, 06:27 PM #1
Low Superheat Compressor Rack System
Hello everyone!
I'm in this project where a 5 compressors Rack system is used to cool 7 rooms, each room with 2 evaporators.
The Rack has beeing working like 3 months but suddenly I noticed that the Superheat at the Compressors inlet is getting very low, some times short periods of time but sometimes considerable periods of time, as low as barely having superheat at all.
Have you ever deal with a situation like this???
Hope you can help!
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03-08-2011, 11:51 PM #2
Re: Low Superheat Compressor Rack System
check the expansion valve bulb for good contact and insulation
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04-08-2011, 09:40 AM #3
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Re: Low Superheat Compressor Rack System
How evaporators are defrosted?
Are they full of ice or clean of ice.
Does all fans are operational.
Check individual superheat of all evaporators.Last edited by nike123; 04-08-2011 at 09:48 AM.
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04-08-2011, 11:44 AM #4
Re: Low Superheat Compressor Rack System
george,
What you consider low superheat? Do you have notice any sign of trouble at the compressors?To make progress is never good enough, I want to do better and better and better
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04-08-2011, 02:23 PM #5
Re: Low Superheat Compressor Rack System
Thanks to all!!
Unfortunately there was a broken compressor before we could get there to check the entire system, we found a non operational TXV at one evaporator, it got stuck wide open so liquid refrigerant got to the compressors manifold, apparently the closest compressor to that circuit pipe suctioned the liquid and went out of oil until it broke down.
Do you know why a TXV would ever get stucked after months of correctly operation????
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04-08-2011, 02:48 PM #6
Re: Low Superheat Compressor Rack System
Maybe because a not well cleaned system and debris get in to the spindle and spindle liner...
To make progress is never good enough, I want to do better and better and better
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04-08-2011, 05:45 PM #7
Re: Low Superheat Compressor Rack System
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04-08-2011, 06:30 PM #8
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04-08-2011, 08:31 PM #9
Re: Low Superheat Compressor Rack System
Yes, I think chillerman2006 missed the 3 months of operation data...
We replaced the TXV and run the Rack with the 4 working compressors and seems to be ok. Superheat in compressors manifold is between 25º - 29ºF.
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04-08-2011, 08:35 PM #10
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04-08-2011, 09:21 PM #11
Re: Low Superheat Compressor Rack System
I guess then we can only assume a fabrication defect???
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05-08-2011, 08:44 AM #12
Re: Low Superheat Compressor Rack System
To make progress is never good enough, I want to do better and better and better
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05-08-2011, 09:35 AM #13
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05-08-2011, 10:49 AM #14
Re: Low Superheat Compressor Rack System
To make progress is never good enough, I want to do better and better and better
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05-08-2011, 02:37 PM #15
Re: Low Superheat Compressor Rack System
Yes, I agree with that, I meant it was ok because no liquid refrigerant was coming back to the compressors so I was reliefed. We will get the new compressor and after installation we will adjust all TEV's superheat.