View Full Version : Mcquay Chiller problem
mattblade
09-12-2013, 10:40 PM
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
Hi matt which mcquay chillers are they screw als with soft starter
mattblade
09-12-2013, 11:35 PM
Hi matt which mcquay chillers are they screw als with soft starter
hi, theres 2 large screws, on 134a 20kgs in each, 2 circuits, i dont thinknit has soft start on, im going back in the morning so ill check then
RusBuka
10-12-2013, 06:44 AM
One-screw McQuay, oil everywhere?
mattblade
10-12-2013, 06:49 AM
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
mattblade
10-12-2013, 09:55 AM
solid state sorry
FreezerGeezer
10-12-2013, 10:58 AM
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.
RusBuka
10-12-2013, 12:06 PM
May be its only electric heater.
I dont understand, you try to start chiller, whats happens? Or its in stand-by mode
mattblade
11-12-2013, 08:42 AM
it wont start, goes to start up and alarms out, how ever it did it to 1 circuit not 2 yesterday
FreezerGeezer
11-12-2013, 09:12 AM
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.
trosten
30-12-2013, 09:35 AM
Very well explained...
install monkey
30-12-2013, 10:09 AM
we got a model number yet,maybe a fault code?
sachinp747
08-01-2014, 02:03 PM
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
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