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Thread: 3 phase scroll locked up.
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12-08-2009, 06:11 PM #1
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3 phase scroll locked up.
I had a 3 phase scroll locked up on me. Before I condemed it, I reversed the rotation and got it to run backward. Moved the leads back and it ran fine. Has anyone come across this, or is it common knowledge to do this.
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12-08-2009, 06:13 PM #2
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Standard 3 phase quick fix...but u still have an issue...why did it lock up in the first place
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12-08-2009, 07:26 PM #3
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agree. There's probably internal damage. They will probably call you back friday at 1pm and want you to install a new compressor.
Originally Posted by yellowirenut
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12-08-2009, 07:52 PM #4
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Thank you for the reply. I did inform the customer that this was a temp fix and there could still be issues. with thier compressor.
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12-08-2009, 09:54 PM #5
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unit probably flooding. Anytime you have a locked up compressor you should check the subcooling,superheat and pressures.
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12-08-2009, 10:04 PM #6
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What type of unit is the compressor in? More info
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12-14-2009, 08:37 PM #7
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CCH
Check the crankcase heater. Oil foaming on startup washes the bearings and shortens life of compressors.
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12-15-2009, 11:12 AM #8
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just had a 7.5 ton trane rtu do the same thing.... after futher checking
the control circuit was calling for both heat and cool.... on/off sequence
fried the compressor.
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12-15-2009, 11:36 AM #9
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The initial "no-start" may have caused by axial sealing of the scrolls due to a higher pressure on the suction side than on the discharge side. Here's an excerpt from a scroll replacement guide by Copeland Europe:
Here's a link to the page:Rapid charging on the suction side of scroll compressors can occasionally result in a temporary no-start
condition for the compressor. The reason for this is that if the flanks of the spirals happen to be in a sealed
position, rapid pressurization of the low side without opposing high side pressure can cause the spirals to seal
axially. Consequently, until the pressures eventually equalize, the spirals can be held tightly together, preventing
rotation. The best way to avoid this situation is to charge on both the high and low side simultaneously at a rate
which does not result in axial loading of the spirals.
http://www.ecopeland.com/literature/...idelines_0.pdf
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