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  1. Replies
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    jimmyd5, I have recently worked on a YCAS130...

    jimmyd5,
    I have recently worked on a YCAS130 with similar issues (low amp/MP/HP fault). Is this the same fault you are getting? You said your equipment will run and then go to 0 amps. How long did...
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    2,530

    Still no link to York literature. Your killing me...

    Still no link to York literature. Your killing me smalls! Maybe they are trying to sell more classes on limited information? :rolleyes:
  3. Thread: Peh 126

    by IGBTech
    Replies
    5
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    699

    Randy S --unfortunatly I'm getting this...

    Randy S --unfortunatly I'm getting this information 2nd hand through a senior tech that took a class on microtech some years back. He told me that they received a list of readings and then was told...
  4. Thread: Peh 126

    by IGBTech
    Replies
    5
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    699

    Peh 126

    I was told to ignore the subcooling/suction superheat readings on the micro-tech controller for this McQuay chiller. This was supposed to come from the McQuay techs themselves. Is this true? Were...
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    PWM Filters

    It seems to me that alot of newer drives are competing on being the smallest and most affordable. Could it be possible that drive manufacturers are skimping on the quality/quantity of their output...
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    460

    Thanks for the info! I'll pass it on.

    Thanks for the info! I'll pass it on.
  7. Replies
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    460

    Molecular Sieve?

    Just a quick question on what kind of material Trane uses inside their canisters downsteam of the pumpout. Is it really just activated carbon? Also, do you guys send it out when it becomes saturated?...
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    Well everyone, after a very comfotable fall...

    Well everyone, after a very comfotable fall (temperature wise ), we got our mits on this screw. Low and behold, the brass fitting was cracked on the MPT end.
    Frank, I haven't called Steve yet....
  9. Replies
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    Could possibly have iced or fosted coil. Bad fan...

    Could possibly have iced or fosted coil. Bad fan motor, not enough defrosts? Maybe a flooding TXV ( short suction line can amplify this ). Check superheat at coil and compressor. Old school techs say...
  10. Thread: Tube Cleaning

    by IGBTech
    Replies
    19
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    1,793

    How long does it take when using citric acid?...

    How long does it take when using citric acid? I've heard different stories. Also is it very expensive compared to the alternatives?
  11. Thread: Abb Vfd Wtf!!

    by IGBTech
    Replies
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    6,033

    What were the E-3's doing? Did you get specific...

    What were the E-3's doing? Did you get specific faults or were they random? How are they controlled? Having a control circuit that is earth grounded is not good on the Toshibas. I'm not really...
  12. Replies
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    Thanks for the replies! Absrbrtek-thanks for the...

    Thanks for the replies!
    Absrbrtek-thanks for the link, good article. Supid question-why both ends? Shouldn't just grounding the rotor (regaurdless of where) be enough to discharge the voltage?...
  13. Replies
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    5,012

    Bearing failure due to VFD

    We have been experiencing some bearing failures on various chillers that we have retrofitted with VFDs. I have been told that it is due to charging of the rotor. My question is why doesn't it happen...
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    1,972

    How big are the filter dryers? Could it be...

    How big are the filter dryers? Could it be possible they are plugging up with sludge from excessive discharge temps (bad condenser fan motors or plugged condenser coils). Just rambling.:o
  15. I have seen a t-stat placed in the evap coil to...

    I have seen a t-stat placed in the evap coil to initiate off cycle defrost when the evap approaches freezing (keeping the fan on of course). I have also witnessed a version of hot gas bypass if the...
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    1,842

    Man freonguy, if you were wrong all day you were...

    Man freonguy, if you were wrong all day you were right with that post!
    Those three A.M. calls did suck ,contrltech. How about the late night cleaning of anything from dairy cases to plugged up meat...
  17. Replies
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    1,108

    WE have three PEH100's with the tee assembly but...

    WE have three PEH100's with the tee assembly but the capped tube is more like 12" long. I was just wondering what they were for, thanks for the explanation. They look factory installed or "clean"...
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    how big is the box? If it's marginally sized it...

    how big is the box? If it's marginally sized it will definitly take longer to pull down, right?
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    Sorry if I came off as disagreeing on hot gas...

    Sorry if I came off as disagreeing on hot gas bypass that is definitly not the case. I was just wondering if you had come across major problems with the EPR set up?
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    Could it be possible they are emtying the product...

    Could it be possible they are emtying the product to facilitate cleaning?
  21. Replies
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    1,725

    Have you ever used EPRs w/ a suction stop defrost?

    Have you ever used EPRs w/ a suction stop defrost?
  22. Replies
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    oops:o had that backwards didn't I. Based on the...

    oops:o had that backwards didn't I. Based on the fact that the only difference between 507 and 404A is 4% 134A I deduced that when 404A leaked out the first one to go would be the 134A essencially...
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    I have retrofitted systems with 507 with great...

    I have retrofitted systems with 507 with great results. Sometimes you actually increase capacity (slightly) utilizing 507 rather than 502 (due to existing suction line sizes). Besides, if the system...
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    What effects would you see if the tech had been...

    What effects would you see if the tech had been charging vapor out of his 404A cylinder and this job finished off the drum? I mean, I see the noncondensibles, but if this guy did get all the air (or...
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    Sounds like they didn't have the accel deccel...

    Sounds like they didn't have the accel deccel times set right. Utilizing a VFD for soft start still aids in energy efficiency and its easier on the motor (rather than accross the line), right?...
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