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  1. Replies
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    I thought I would tag on to this thread. I...

    I thought I would tag on to this thread. I approached this thing and it was squealing like a pig but way loud. I adjusted the gas pressure down a bit and the noise stopped but then I had hard starts....
  2. Thanks guys, I have a few things to try. My ahu's...

    Thanks guys, I have a few things to try. My ahu's are probably over 150' away.
  3. That would require, at times, for the slave...

    That would require, at times, for the slave machine to use the lead machines control power. That is unacceptable. The control powe cannot be shared under any circumstances, I need to maintain the...
  4. Need 2 AHU's to share a pressure transducer

    I have two large air handlers that share a common duct system. Supply Fan vfd's maintain a static pressure in the supply duct. Each machine has its own separate pressure transducer. Because it is...
  5. Replies
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    1,785

    I see why I'm a little confused. You are stating...

    I see why I'm a little confused. You are stating data from the horizontal supply chart. This is a vertical discharge instalation
  6. Replies
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    1,785

    .93" with filters .98" without.

    .93" with filters .98" without.
  7. Replies
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    1,785

    Here are the fan performance notes. Sorry about...

    Here are the fan performance notes.
    Sorry about the lack of spaces, don't know why it pasted like that.
    General fan performance notes:
    1.Interpolation is permissible. Do not extrapolate....
  8. Replies
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    1,785

    I did not, 2.35 hp for this three phase motor.

    I did not, 2.35 hp for this three phase motor.
  9. Replies
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    1,785

    Well, considering the lip around the return box...

    Well, considering the lip around the return box bottom on the RTU is .5", a small decrease in return static to say .35", would preventing water from scaling the lup into my return.

    The chart I...
  10. Replies
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    1,785

    Could a vortex be sustained through an evaporator...

    Could a vortex be sustained through an evaporator coil? Seems impossible.
  11. Replies
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    1,785

    Are you saying a vortex would increase my sp?...

    Are you saying a vortex would increase my sp? Awesome.
  12. Replies
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    1,785

    According to install manual, the maximum return...

    According to install manual, the maximum return static "shall not exceed" .35" , I'm at .6". Due to configuration the return drop cannot be increased, beam and roof truss in the way. Anyone ever put...
  13. Replies
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    1,785

    Medium static option.

    Medium static option.
  14. Replies
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    1,785

    I don't see where you extrapolated that data. Is...

    I don't see where you extrapolated that data. Is it off the performance chart I gave you?
  15. Replies
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    1,785

    Amp draw of 2.2. Which is 1.35 hp I believe. So...

    Amp draw of 2.2. Which is 1.35 hp I believe. So 1270 x 1.35 hp is 1714.5? 342 cfm?
  16. Replies
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    1,785

    Still not real clear on what maximum external...

    Still not real clear on what maximum external static pressure is. For this unit it says that MESP is 1". However, the fan performance chart that I posted for this exact unit indicates the ability to...
  17. Replies
    49
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    1,785

    http://i849.photobucket.com/albums/ab53/loats/Mobi...

    http://i849.photobucket.com/albums/ab53/loats/Mobile%20Uploads/20140917_102510_zps353fd540.jpg...
  18. Replies
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    1,785

    Did i do this right? ...

    Did i do this right?

    http://i849.photobucket.com/albums/ab53/loats/Mobile%20Uploads/20140917_102510_zps353fd540.jpg

    ...
  19. Replies
    49
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    1,785

    Here are my goals for today. Determine CFM...

    Here are my goals for today.

    Determine CFM using tesp and fan data.
    Determine if rpm is constant in regard to changing static pressure.
    Measure static pressure through duct and determine where...
  20. Replies
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    1,785

    My total difference is 1"

    My total difference is 1"
  21. Replies
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    1,785

    Carrier M# 48TCEA06A2A6A0A0A0 The filter rack...

    Carrier
    M# 48TCEA06A2A6A0A0A0

    The filter rack is on coil.
  22. Replies
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    1,785

    I'm trying to determine if I actually have a...

    I'm trying to determine if I actually have a restriction issue via inadequate ductwork or if esp is within range and I just need to do a better job of sealing the economizer package and other voids.
  23. Replies
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    1,785

    There is no fire damper. I have a total esp of...

    There is no fire damper. I have a total esp of just over 1", that seems high but according to the Max esp the unit should still deliver the appropriate cfm. That doesn't solve the issue of sucking...
  24. Replies
    49
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    1,785

    Maybe I'm interpreting the chart incorrectly. I...

    Maybe I'm interpreting the chart incorrectly. I am actually going to pick up a photo tachometer. I am really curious to see the practial application of this fan curve.

    Another question. Maximum...
  25. Replies
    49
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    1,785

    Then why does the fan data for that specific unit...

    Then why does the fan data for that specific unit give me different cfm values at certain static pressure at different rpm values? According to the data, if the static pressure changes so does the...
  26. Replies
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    1,785

    When I compare the esp to similar systems in the...

    When I compare the esp to similar systems in the same space I find this unit almost triple that of the others. I have a problem that is causing the unit to draw in rainwater. I believe if the return...
  27. Replies
    49
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    1,785

    static pressures let's talk

    I have an rtu that has a -.6" return static. The problem is the unit sucking in rain water from every void in the thing. Refrigeration, got it covered. Airflow not so much. Anyone care to discuss...
  28. Replies
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    1,731

    Nope, but your compressor would suffer from lack...

    Nope, but your compressor would suffer from lack of cool refrigerant.
  29. Replies
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    1,731

    Nope, if that were the case the fan switch on...

    Nope, if that were the case the fan switch on stat would make us all millionaires. Still wouldn't do it.
  30. Replies
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    1,375

    Thanks.

    Thanks.
  31. Replies
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    1,375

    I don't think anyone is understanding my...

    I don't think anyone is understanding my question. If your furnace is equipped with a two stage stat and there is a call for for 1stage heat and that 1stage heat is keeping up with demand, after the...
  32. Replies
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    1,375

    Aside from a 2stage stat dropping out 2nd stage...

    Aside from a 2stage stat dropping out 2nd stage when St PT and actual get close to each other, the furnace timer is going to kick on 2nd stage regardless of what the 2stage stat is asking for,...
  33. Replies
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    1,375

    Compressor delay timers in ou and stat are...

    Compressor delay timers in ou and stat are compounding, integral furnace 2nd stage and stat 2nd stage timer are parallel. So, they really aren't alike at all. Again how does the furnace know not to...
  34. Replies
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    1,375

    Coming from an industrial service tech. How does...

    Coming from an industrial service tech. How does the furnace know there is a two stage stat hooked to it. Seems like the integral furnace timer would kick in regardless of what the two-stage...
  35. Replies
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    Some equipment states in the instructions to...

    Some equipment states in the instructions to block off airflow to get condensing temps up. Mostly on dual cfm equipment.
  36. The unit may be labeled single phase but check...

    The unit may be labeled single phase but check the compressor, might be 3 phase, had it happen.
  37. Why would you replace and how did you test before...

    Why would you replace and how did you test before install?
  38. Thread: MO99

    by nine o
    Replies
    31
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    2,276

    We have a two school districts that are being...

    We have a two school districts that are being converted to MO99 when repairs are justifying it. It works well.
  39. Replies
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    511

    I'm happy because when I'm in the woods this...

    I'm happy because when I'm in the woods this fall, some blockheads will be staring at their tv rather than sitting in a deer blind with their itchy trigger finger and a six pack.
  40. Replies
    42
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    3,178

    I had a leak not to long ago that would leak...

    I had a leak not to long ago that would leak under vacuum but not under pressure, drove me out of my mind. Finally got lucky and the sob leaked a very small amount under pressure on the fourth...
  41. Replies
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    2,077

    Non condensables will raise head pressure,...

    Non condensables will raise head pressure, because they don't condense.

    Discharge superheat can be a good indication of compressor efficiency. High discharge temperatures can indicate minimal...
  42. Replies
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    Dog pee

    Dog pee
  43. Replies
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    2,077

    Well the size of the piston didn't change from...

    Well the size of the piston didn't change from when it worked well to now. So checking the piston would only be for a blockage, and that would give you the opposite, low suction, high head.
  44. Replies
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    3,236

    In my experience, they get burnt one day or...

    In my experience, they get burnt one day or another. I'll take their business, and when they decide that it is not cost effective to purchase their own parts, I'm right their to get the job done.
    ...
  45. Replies
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    1,506

    Just did this repair. Customer said unit would...

    Just did this repair. Customer said unit would not cool house enough, I looked sure didn't. Then said of odor at start up. I checked the return air temp at filter, 102*. Removed all insulation,...
  46. Replies
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    2,077

    curious what discharge superheat is. sounds like...

    curious what discharge superheat is. sounds like comp. is not moving very much ref.
  47. Replies
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    3,236

    I'll install a customer supplied part every time,...

    I'll install a customer supplied part every time, you know how much cash that saves by avoiding warranty issues. Cash money, no strings attached.
  48. Replies
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    3,236

    Unless it was obviously an install problem, I...

    Unless it was obviously an install problem, I would not be warranting any HO supplied parts. The OP starts by saying it was to avoid complications, more likely it was to save a couple of bucks. He...
  49. Replies
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    694

    That vent should have a damper on it or on the...

    That vent should have a damper on it or on the duct or both, the velocity of air moving through that vent should be calculated via manual D, your contractor should be able to determine whether or not...
  50. Replies
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    The knowledge database here is comparable but in...

    The knowledge database here is comparable but in no way does it exceed the knowledge database I have at my fingertips. I work for one of the largest equipment manufacturers in the world, my employer...
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