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Thread: McQuay centrifugal chiller
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19-04-2012, 06:57 PM #1
McQuay centrifugal chiller
Hello friends
I have a problem in McQuay centrifugal chiller Model WSC 079 when starting the chiller the oil pump run and shows low net pressure , the oil migrates to the condenser and oil level drops , when adding excess oil the same phenomena is repeated and more oil is lost , please tell me the reason for this case .
so many thanks
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19-04-2012, 11:29 PM #2
Re: McQuay centrifugal chiller
How far does the level drop?
How long ar you running the machine for?Brian - Newton Abbot, Devon, UK
Retired March 2015
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20-04-2012, 06:53 AM #3
Re: McQuay centrifugal chiller
Dear Sir :
thanks for your early reply, the level drops for about two liters for period of 30 sec at pre-lubrication then micro tech display shows vane open and the chiller shut down
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20-04-2012, 08:49 AM #4
Re: McQuay centrifugal chiller
Please list oil temperature, oil pressure and evap pressure just for starters. what is your starting oil level? is it visible in the glass?
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20-04-2012, 12:07 PM #5
Re: McQuay centrifugal chiller
Hi Do you have a separator with in the system?
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20-04-2012, 12:24 PM #6
Re: McQuay centrifugal chiller
Dear friends
thanks for your interest the oil temp is (47 oC) , oil net pressure = 5 bar at beginning of oil pump starting then quickly drops to 1.5 bar and oil level disappears from sight glass , before oil pump operation the oil level is normal , I added oil to the sump three times to recover the normal level but the same problem was repeated
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20-04-2012, 12:27 PM #7
Re: McQuay centrifugal chiller
Dear friend
there is no oil seperator within the system
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17-05-2012, 03:25 AM #8
Re: McQuay centrifugal chiller
look like a oil leak in vane inlet maybe a torn o ring
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14-07-2012, 03:32 AM #9
Re: McQuay centrifugal chiller
Khaled hilaly the cause of your problem is oring or orings within the igv have failed which will cause loss of oil return to pot and oil pressure this is a common problem with all mc quay centrifugal chillers I have the oil problem bulletin + check procedure to diagnose fault send me your email address