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  1. Replies
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    239

    As an addition: If the fan was in "on" mode and...

    As an addition:
    If the fan was in "on" mode and compressor wasn't running, just cycling the indoor air, you prob would not have seen a diff across the coil.
    A thought.
  2. Replies
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    Dry Cooler Sequence

    Does anyone know of any stats/studies done on:
    Staging a dry coolers fans and efficiency or temp drop?

    I have seen them staged starting from the manifold end and starting from the opposite end...
  3. Replies
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    999

    Nice insight hvacker, thanks and agreed.

    Nice insight hvacker, thanks and agreed.
  4. Replies
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    999

    Our lead HVAC tech made the claim to fame on this...

    Our lead HVAC tech made the claim to fame on this one.
    I asked at the beginning what we were varying the drives off of , the return loop?
    and it was stated
    Quote: all you need to do is slow it...
  5. Replies
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    999

    The vfd's are placed in manual override and we...

    The vfd's are placed in manual override and we can vary the speed with the potentiometer.
    The three way valves we do have offset the air handlers they serve, but we do not have control on a floor...
  6. Replies
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    850

    The gauge will reference what you are trying to...

    The gauge will reference what you are trying to measure.
    Example:
    State a input to the magnehelic is placed before your filters is a constant pressure,
    The other side would be installed after...
  7. We have used HotShot for years and never have had...

    We have used HotShot for years and never have had a problem with it.
    ICOR has a new app as well which is a great one for quick referencing.
    Agree on the 80% and let it balance well before you...
  8. Replies
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    2,914

    I myself have slowly learned that refreshing...

    I myself have slowly learned that refreshing yourself on any training is a huge help on staying up to date with ever changing technology.
    You won't know everything and those who think they do are...
  9. Replies
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    2,783

    This seems far fetched but, do the fins on the...

    This seems far fetched but, do the fins on the evap coil lead to the drain pan?
    I was guessing the condensate was catching half way down on a horizontal fin evap which should have been horizontal or...
  10. Replies
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    432

    http://www.hvacpartsshop.com/GCS24%20Series.pdf ...

    http://www.hvacpartsshop.com/GCS24%20Series.pdf

    Pages 34-35 on give a schematic and a decent detail of what is going on in the circuitry.
    Thought it might be helpful for you.
  11. Replies
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    686

    Makeup air is a separate control offset with the...

    Makeup air is a separate control offset with the relief damper.
    I'm assuming it has been wrong since the dawn of time.
    It is a multi zone unit with is controlled individually , five zones, via...
  12. Replies
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    999

    No stats on the loops on any of the loop. Oddly...

    No stats on the loops on any of the loop.
    Oddly the only thing that us controlling anything is the pump being constant volume.
    I am seriously debating if we do not have a natural circulation with...
  13. Replies
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    425

    Sounds like an old timer giving you tricks. I...

    Sounds like an old timer giving you tricks.
    I play it safe and follow the specs on the jug,
    Figure you save yourself by taking a few minutes and figuring out your system size and go about it the...
  14. Replies
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    2,537

    We scrap everything also, and if you don't...

    We scrap everything also, and if you don't separate the metals you don't get what it's worth.
    I agree, use some free time to rip it apart and enjoy a buck or two.
    We have a 60 ton coil going back...
  15. Replies
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    659

    From any of my calculations we are not going to...

    From any of my calculations we are not going to see any investment in the pumps.
    I have placed them inline for flow control to slow down the flow.
    Odd situation is we are not modulating them on...
  16. Replies
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    999

    VFD config. on pumps

    We have a began the install of adding VFD's to our heating loop on 2HP motors or less.
    I am being told that on a 6 story building with 3 separate wings fed off of the main, with their own supply...
  17. Replies
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    686

    Damper control

    We have a split coil, hot deck/cold deck ahu which is supplying a single area in our building.
    Statement was brought up that we couldn't satisfy on hot days and never have been, the unit was to...
  18. Replies
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    398

    Damper control.

    We have a split coil, hot deck/cold deck water unit which is supplying a single area in our building.
    Statement was brought up that we couldn't satisfy on hot days and never have been, the unit was...
  19. Replies
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    659

    VFD's on pumps.

    We have a began the install of adding VFD's to our heating loop on 2HP motors or less.
    I am being told that on a 6 story building with 3 separate wings fed off of the main, with their own supply...
  20. I have the same situation with every tech I come...

    I have the same situation with every tech I come in contact with,,, in fact I have 2 50 pound recovery tanks at my job with 50 pounds of r22 in them. (not recovered by myself) But is is un-nerving...
  21. Does the exterior unit have a temp control for...

    Does the exterior unit have a temp control for fan and compressor cycling / defrost. Wondering if the sensor could be out of calibration or settings wrong which would shut off your exterior unit....
  22. Replies
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    604

    AOP violation

    I have a question as to what parts of the site I can post on.
    I got kicked off for a few weeks for the violation and am wanting to get my min posts to become a prof. member but do not want to get...
  23. Replies
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    1,386

    You can read continuity through the switch if it...

    You can read continuity through the switch if it is ok. If pressure falls for a low pressure, or rises for a high pressure then you would not read continuity through the switch. This also goes with...
  24. Replies
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    974

    Slow Recovery

    This is just a tech tip.

    We have 103 degrees temps, trying to recover a 100 pound system. It just isnt pulling. Shut off the fans on a four stage, two compressor r-22 McQuay DX system.
    ...
  25. Replies
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    839

    I have done studies on this things only because...

    I have done studies on this things only because they loooove my backyard and I hate them. They love cool and dark areas and hide in them. I dont think that this is because of the contactor. Try...
  26. Replies
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    810

    Thats what I am thinking... I am not saying that...

    Thats what I am thinking... I am not saying that the pressures werent overcharged in the first place.
    And the contactor was pulled in. I had voltage to the comp. and nothing.

    But then the mystery...
  27. Replies
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    2,147

    We currently use our mixed air for modulation. ...

    We currently use our mixed air for modulation.

    Plus keep the variables set for min and max to not overshoot your building. Are you using a program to control the ddc, we currently have Seimens...
  28. Replies
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    3,528

    I'll agree to a point on all accounts. I've seen...

    I'll agree to a point on all accounts. I've seen to much back stabbing to get beyond the human element though.
    Seems that it always catches up to them in the long run. Its only if you are willing...
  29. Replies
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    810

    Compressor Failure

    We had a few storms feed through here in Ohio in the past week. Had a chance to go look ata buddys ac unit which wasnt working properly, at all by the time I got there.
    He stated that the tech that...
  30. Replies
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    1,154

    Guess you are not the most optimistic person to...

    Guess you are not the most optimistic person to get feed back from... Lol. I'm still stating and maybe I am wrong that anyone doing a service run on a daily basis knows what to look for before they...
  31. Replies
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    1,154

    Yes, we call it "preventative maintenance" and...

    Yes, we call it "preventative maintenance" and this does improve the longevity of our equipment. But it still doesn't involve as much of the troubleshooting side of the field as I would like.
  32. Replies
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    1,487

    Just a question,,,, what is the refrigerant you...

    Just a question,,,, what is the refrigerant you are working with on this system?
  33. Replies
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    1,154

    Training vs. experience

    In my work we have to fix what is broken. The only thing in Commercial Facilities we do not have a a/c unit broke on a daily basis...
    And that is the only training I get besides my personal...
  34. Replies
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    32,852

    I carry my blackberry phone with the flashlight...

    I carry my blackberry phone with the flashlight app... cant leave home without it and it works like a charm. Seen the light for the iphone 4's just as nice. Yes its not a typical flashlight but,,,,...
  35. Replies
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    1,462

    Shhh,,,, sounds like a patent to me. lol I...

    Shhh,,,, sounds like a patent to me. lol I never have heard of one but how does your work to not be in the way of the door or yourself or the furnace on an changeout?

    Keep ya posted if I see...
  36. I would figure everyone temperment is a bit...

    I would figure everyone temperment is a bit different... some want work done for free some want to tip you when you leave on top of what they owe.

    It seems as if it was wrong place wrong time,...
  37. Replies
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    6,372

    I believe in OEM specs but a good rule of thumb...

    I believe in OEM specs but a good rule of thumb is 10-12 superheat at evap, and 20 at comp.,
    And subcooling 10-18.
    I honestly havent found it any diff. from application to application. Heard it...
  38. Replies
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    2,183

    We also use "hotshot" for any R-12 conversions......

    We also use "hotshot" for any R-12 conversions... great on price and swear by it. Just in case it helps you on price at all.

    http://www.icorinternational.com/products.html

    Close p/t swings...
  39. Replies
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    2,183

    that would corrilate to a -21 evap by pt...

    that would corrilate to a -21 evap by pt conversion. More than enough cooling at the evap. How many fans do you have running on the evap? I would check that one wasn't running backwards or not at...
  40. Replies
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    827

    http://www.hvacsalesandsupply.com/Linked%20Documen...

    http://www.hvacsalesandsupply.com/Linked%20Documents/Tech%20Tips/Proper%20System%20Charging.pdf

    This might help out as well... with this subcooling and superheat chart.
  41. Replies
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    827

    What are the low side pressures. 60 psi or...

    What are the low side pressures. 60 psi or greater I am assuming at this point to be above freezing at the coil. Delta T across coil above 20, Subcooling 10-12? Superheat 10-12?...If so,,, seems...
  42. Replies
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    1,932

    Boxed around both sides of the stud? Or just cut...

    Boxed around both sides of the stud? Or just cut out and you are going to seal around stud? Either way. I think I would have asked to have it reframed, or reframe it myself to have it an open access...
  43. Replies
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    1,746

    I work in maintenance, actually blessed, ...

    I work in maintenance, actually blessed, "commercial maintenance". You figure any job out there has a little to do with a/c,,,plumbing, electric, hvac, try to look around for something in...
  44. Replies
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    1,200

    I've had some pretty nasty coils, that one looks...

    I've had some pretty nasty coils, that one looks like a cat got stuck in it. Flaky coils is a definite on a replacement.. but it looks more like hair to me. A little tlc with a cleanout might be a...
  45. Replies
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    1,086

    Not freeze stat, oil pressure, or thermal, none...

    Not freeze stat, oil pressure, or thermal, none would trip out on a staging and only on start up of staging. Thermmal overload, but no way would it cool down in a five minute reset delay...
    Low...
  46. Replies
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    1,086

    I believe yes and yes. Reseting it times unit...

    I believe yes and yes.

    Reseting it times unit out for the five minute delay and both stages are on and run like a charm. I also have only one liquid line and one discharge to the comp.
    If temps...
  47. Replies
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    1,086

    Lol. Nope, oil pressures were reading fine so we...

    Lol. Nope, oil pressures were reading fine so we didnt add oil. Pump was working fine. Just the safety needed replaced, It would trip out on a false reading. No biggie, quick replacement job.
    One...
  48. Replies
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    2,474

    I have always heard 10 degrees is a good rule of...

    I have always heard 10 degrees is a good rule of thumb subcooling and you are getting more than a 3/1 ratio out of your compressor. Great on efficiancy but could be a sign of a slight charge offset?
  49. Replies
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    1,086

    My initial question would be, would a unloader on...

    My initial question would be, would a unloader on this compressor, when staging, cause the compressor to trip out on a safety. Be it low or high head or temp? Could it?
    If the staging was incorrect,...
  50. Replies
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    1,086

    It is a split McQuay and no, not off hand I do...

    It is a split McQuay and no, not off hand I do not. The old compressor was not doing this and it is an exact changeout. It just shuts off on what seems when it trys to make the second stage.
    This...
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