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Thread: Problem with mc quay chiller.
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14-05-2010, 07:38 PM #1
Problem with mc quay chiller.
Hello guys.I have a problem with a mc quay water cooled chiller model ESH.D.120 and compressor model MQC 806 s.I started the system and after a minute it stopped from oil pressure.Suction pressure 4 bar,oil pressure 4 bar,disharge pressure 8 bar.Any idea why is this happening?Does anybody have the manual of that chiller or compressor??
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14-05-2010, 07:58 PM #2
Re: Problem with mc quay chiller.
Just a few guesses
Has the compressor been serviced lately? Is the oil pick up strainer clean?
Is the oil sight glass level correct?
Does the oil foam in the sight glass?
Oil safeties are there for a purpose.
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14-05-2010, 08:00 PM #3
Re: Problem with mc quay chiller.
No oil pressure, should be about 6 to 8 bar above suction. If the compressor actually turned it could be that the oil pump is broken. There should be a linkage that sits in a slot on the end of the shaft to drive the oil pump.
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14-05-2010, 08:05 PM #4
Re: Problem with mc quay chiller.
Thanks four your reply Frank.It is my first visit in this machine.I do not think that it has been serviced.The oil level is in the middle of the sight glass.No foam in the sight glass.Standing pressure of r22 is 7 bar.
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14-05-2010, 08:10 PM #5
Re: Problem with mc quay chiller.
Have you measured the oil pressure on start up?
If you temporarily link out the oil control switch (2 minutes max above the knock out time) does the machine run?(to confirm that the switch is operational)
What about operating pressures during start up - are they correct?
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14-05-2010, 08:18 PM #6
Re: Problem with mc quay chiller.
The oil pressure on start up is the same with suction pressure.The operating pressures until the compressor stops are LP 4 BAR,HP 8 BAR.
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14-05-2010, 08:23 PM #7
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14-05-2010, 08:26 PM #8
Re: Problem with mc quay chiller.
I agree with you Frank.But what about the refrigerant pressures?What do you believe about them?Thanks for your reply ptsac.
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14-05-2010, 08:30 PM #9
Re: Problem with mc quay chiller.
The pressures will be dependent on chilled water temp and ambient. Oil pressure should still be developing regardless of level of charge.
Last edited by ptsac; 14-05-2010 at 08:41 PM.
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14-05-2010, 08:33 PM #10
Re: Problem with mc quay chiller.
Temperature in water cooler 25 celcious.Temperature in cooling tower 30 celcious.
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14-05-2010, 09:01 PM #11
Re: Problem with mc quay chiller.
There maybe a problem with charge level, however there does appear to be an oil pressure problem that will require the compressor to be opened for inspection, this is the immediate issue.
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14-05-2010, 09:04 PM #12
Re: Problem with mc quay chiller.
Thanks ptsac.Do you have the service manual of this compressor??
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14-05-2010, 09:18 PM #13
Re: Problem with mc quay chiller.
Unfortunately not, however look at Halltherms spares site
http://www.mcquayinternationalparts....ucts/?cat=8130 you may get some idea from that.
There is a sump pan filter for oil pump suction, Oil is then straight to the oil pump and then fed to a filter and pressure relief device before going to bearings etc. There could be a possibility that this assembly has not been tightened properly previously and oil is escaping from the assembly. This assembly is accessible from outside the compressor I think. Gas is still going to have to be removed as is oil. prepare for some mess.
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14-05-2010, 09:35 PM #14
Re: Problem with mc quay chiller.
Thank you very much ptsac.
I will check the site.But i still cannot understand the pressure difference.Don't you believe that high and low pressure are too close?
Refrigerant 22 in the circuit
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