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Thread: McQuay chiller
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08-07-2010, 11:08 AM #1
McQuay chiller
Hi,
I am currently investigating a series of failures associated with McQuays chillers (ALS D 229 2XEXN), The equipment has had a series of failed Screw compressors.
The failures have all been associated with a break down of the insulation of the compressor windings.
Points that I currently believe could be instrumental,
1) The presents of acid in the refrigerant system.
2) The failure of the Star delta interlock timer
3) The condition of the electrical supply
If anybody has had experience of this type of failure with McQuays chiller /Screw compressors I would be interested to have your input.
Thank you for your time.Last edited by james.waite; 02-08-2010 at 01:46 PM.
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08-07-2010, 05:37 PM #2
Re: McQuay chiller
Hi James.
The fact that the comps are McQuay is irrelevant.
Basically all three conditions you describe can be attributed to Motor burnouts and fluctuating voltages.
In some of the more remote sites we look after.
Supply voltage drops have been a huge problem.
You won't get the supply company to admit issues or indeed the site sometimes.
We got to the bottom of similar issues at one site by fitting power monitoring meters to each of the compressor motor supplies.
Which resulted eventually on a new site transformer being installed,
But more importantly it proved the fault was not with the equipment.
And the liability was shifted away from us.
You would be amazed at some of the recorded Voltage drops ( Which will cook compressor motor windings.)
Grizzly
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08-07-2010, 06:40 PM #3
Re: McQuay chiller
Hi:
as grizzly stated ,all the symptomes you stated are voltage related ,when we have these problemes on a site, and believe me we have many ,we install a voltage and current recorder ,and usualy change the starting method, to a digital soft starter ,that protectes the comp from major and minor problemes like these,it is much cheaper ,to retrofit a starter then to change a comp!!!
good luckTHE DEFINITION OF A SMART PERSON IS ONE WHOM LEARNS FROM HIS MISTAKES!!!
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09-07-2010, 05:21 PM #4
Re: McQuay chiller
hi guys what sort of loggers do you use had a look on google and could only find meters clocking in at £1500+
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09-07-2010, 06:28 PM #5
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12-07-2010, 11:41 AM #6
Re: McQuay chiller
Thanks guy's I've wanted to look into the power quality, now it's at the top of my list.
Info on the loggers would be great. Thanks for the advise.
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18-07-2010, 07:49 PM #7
Re: McQuay chiller
Hi James
I have yet to get back to the office to find out who we are purchasing these power meters through?
I have identified the "entity" model which seems to be badged up as several different suppliers.
But I think they are made somewhere on the asian continent.
When i can find out more I will let you know.
Check out the attached.
Grizzly
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19-07-2010, 05:07 AM #8
Re: McQuay chiller
THE DEFINITION OF A SMART PERSON IS ONE WHOM LEARNS FROM HIS MISTAKES!!!
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21-07-2010, 07:39 AM #9
Re: McQuay chiller
Hi James.
Check out the website below,
We purchased the 300 series.
Which we were allowed to do by Credit Card.
These have proved to as I say be very usefull.
Grizzly
http://www.advancedenergy.co.uk/index.php?cPath=6
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21-07-2010, 03:46 PM #10
Re: McQuay chiller
Thanks guy's... I have a picture of the offending unit. Now looking at the set-up it seems as thou a set of receivers have been fitted but not connected.. Or disconnected from the circuit. Not sure if anybody would know what spec McQuay unit these would be off?
I’m grasping at straws here but it just seems very peculiar that they are there at all. Your thought and ideas are welcome!!Last edited by james.waite; 02-08-2010 at 01:54 PM.
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21-07-2010, 04:08 PM #11
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21-07-2010, 04:17 PM #12
Re: McQuay chiller
I agree, I can think of lot's of reasons for them not to be connected but not many for them to be there!!
I almost feel like the unit could have been converted whilst on site or maybe it was another series.. I am finding it hard to locate information on the ALS "D" 229 2XEXN lot's on all the other versions but not the "D"..
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