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Thread: McQuay AGS

  1. #14
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,337
    I returned today, to check on it. Circuit out on fault again. Log showed slide valve position at -1.1% and target at 0.0%. Circuit was off, when failed. Hmm.

    Hooked up my meter and reset circuit. Compressor started loading(verified by amperage), but slide position at -0.9% and my current reading at 3.8mA. No lights on indicator module. Pumped down circuits and reset power to chiller, still no lights on module.

    Ended up throwing a old module on and recalibrating. Have another module on order.

  2. #15
    Join Date
    Feb 2003
    Location
    Wichita Ks
    Posts
    1,477
    just dont unplug it while it is running, either end.

  3. #16
    Join Date
    Dec 2011
    Posts
    107
    don't over tighten screw on the plug.

  4. #17
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,337
    Got a new slide valve sensor assembly in today. It looks like they changed it again.
    Attached Images Attached Images

  5. #18
    Join Date
    Dec 2011
    Posts
    107
    Don't overtighten screw on plug. Leave cap off micro switch till calibration is complete,When complete then power down unite replace cap and plug,then turn power back on.To calibrate Set compressor slide to 0% then press miro switch till it blinks red then increase slide postion to 100% slowly then press micro switch should blink green calibration should be complete.

  6. #19
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,337
    Replaced the slide valve sensor assembly, again today. When I pulled the old one out, I noticed it was worn. Seems pretty bad for only 4 months.

    What eats me......2 year old chiller. Circuit 2 compressor constantly with slide valve faults. Circuit 1 fine. Replace slide valve sensor with new design. Worked fine for 4 months. Then head dies. Replace with another new design. Results unknown.

    I attached a couple of photos. The first is the two older sensors. The top is the original and the bottom is the replacement. The next photo is the one I just put in. The third photo shows the last replacement wear at just 4 months.

    Why McQuay can't tell me why they keep redesigning the sensors?
    Attached Images Attached Images

  7. #20
    Join Date
    Feb 2003
    Location
    Wichita Ks
    Posts
    1,477
    check your email.

  8. #21
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,595
    I think Rick is giving you the holy grail!

  9. #22
    Join Date
    Nov 2008
    Location
    some freezing metal shed somewheres
    Posts
    28
    wow. i have a chiller i recalibrate those slide valves annually. maybe i should pull them. i can't believe you're seeing that kind of wear!

  10. #23
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,337
    Freonick thanks for the pdf! Great info.

    As far as wear.....I only have had issues with this one compressor. And I have only seen the compressor lock out once on "slide valve fault". That was the last one that the head took a crap. All the rest of the lock outs occurred when I wasn't there.

    The original had the ball bearing end. Inspected slide when I replaced it.....didn't see any grooving on it. But replaced it with the new and improved model. Also replaced all wiring...to rule that out. Fine for about 4-5 months, then repeat failures. New model has alot bigger end on it. We will see.......it's been ok so far.

  11. #24
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,595
    I'm kinda sad that half of these model chillers we take care of got taken away from us. They really are interesting and challenging machines to work on!

  12. #25
    Join Date
    Apr 2012
    Location
    Louisiana
    Posts
    660
    I'm having the exact same problem with the circuit #2 continuing to trip despite having replaced the slide valve sensor. It trips intermittently. Can I get a copy of the PDF or the document number?

  13. #26
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,337
    Quote Originally Posted by Sicofthis View Post
    I'm having the exact same problem with the circuit #2 continuing to trip despite having replaced the slide valve sensor. It trips intermittently. Can I get a copy of the PDF or the document number?
    You calibrated it?

    What mA reading you getting from the sensor?

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