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Thread: Mcquay Chiller problem
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09-12-2013, 10:40 PM #1
Mcquay Chiller problem
hi all, we arrived on site to find a mcquay air cooled wated chiller with the alarm transition or state alarm on both compressors, I don't have the model numbers to hand just wonderd if any 1 could shed any light on the problem ??? contacted Daikin but they don't support the model...
Cheers Matt
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09-12-2013, 11:28 PM #2
Re: Mcquay Chiller problem
Hi matt which mcquay chillers are they screw als with soft starter
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09-12-2013, 11:35 PM #3
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10-12-2013, 06:44 AM #4
Re: Mcquay Chiller problem
One-screw McQuay, oil everywhere?
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10-12-2013, 06:49 AM #5
Re: Mcquay Chiller problem
no 2 screws, have same fault, i forgot to say that both compressors are extremely hot aswell but it comes up with the transition or state alarm for both comps
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10-12-2013, 09:55 AM #6
Re: Mcquay Chiller problem
solid state sorry
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10-12-2013, 10:58 AM #7
Re: Mcquay Chiller problem
I'm not familiar with the brand, but since you say both comp's are extremely hot, & given the alarm message, I'm guessing that they are failing to transition from Star to Delta.
I'd be checking power, megger-ing the motors, checking the power train & if no obvious faults, try a dry start - ie. remove the compressor fuses & put it through the start sequence to see what happens.
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10-12-2013, 12:06 PM #8
Re: Mcquay Chiller problem
May be its only electric heater.
I dont understand, you try to start chiller, whats happens? Or its in stand-by mode
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11-12-2013, 08:42 AM #9
Re: Mcquay Chiller problem
it wont start, goes to start up and alarms out, how ever it did it to 1 circuit not 2 yesterday
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11-12-2013, 09:12 AM #10
Re: Mcquay Chiller problem
Did you try what I suggested?
With the equipment I'm familiar with, having removed the Comp. power fuses you can do a dry start - a simulated start, if you prefer. The star/delta contactors & transition resistor bank will still cycle as per design (or as they left the factory) as they aren't dependant on the compressor power.
It was a normal step in the commissioning process, to be sure that the timers were correctly set & all the switching worked as required without endangering the compressor motor.
If something doesn't operate correctly in the dry run, you will have a loose cable, stuffed timer, stuffed item of switchgear, or stuffed transition resistors most likely. After that you're probably into the controller itself.
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30-12-2013, 09:35 AM #11
Re: Mcquay Chiller problem
Very well explained...
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30-12-2013, 10:09 AM #12
Re: Mcquay Chiller problem
we got a model number yet,maybe a fault code?
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08-01-2014, 02:03 PM #13
Re: Mcquay Chiller problem
hi i have mcquay chiller MNG105.2 HA ST model im facing problem for both Circuit A & B, Circuit A showing Alarm AL:E01 Exp A not recognized & Circuit B is Low Ambient tepm start up failure & with AL:206 Low Pressure Alarm #2 what the reason and how to remove this alarm