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  1. There should be a sticker telling you the size...

    There should be a sticker telling you the size A/C the home needs. Its required by HUD for the manufacturer to have done the heat loss and gain calc already.
  2. A CM49C case coil, has a pressure drop of .3" at...

    A CM49C case coil, has a pressure drop of .3" at 1420 CFM. A pressure drop of .4" at 1630 CFM.

    So in order for your system to have been moving 1605 CFM, your supply static alone would need to be...
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    Nah.

    Nah.
  4. What CFM of air was the unit moving when the...

    What CFM of air was the unit moving when the static test was done.

    Where were the static probes placed to take the measurements.
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    Not displaying or revealing what their top rate...

    Not displaying or revealing what their top rate is until they interview people, isn't going to hurt them from fulfilling that statement.
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    Hmmm, so without you, the OP's company is going...

    Hmmm, so without you, the OP's company is going to have to close its doors?
  7. Sounds more like the static test was done with...

    Sounds more like the static test was done with the probes in the wrong places.


    OP, your evap coil alone should have about that much of a pressure drop at 1600 CFM. Then add in an air filter.
  8. Sorry, this is not a DIY site. Thread closed.

    Sorry, this is not a DIY site.

    Thread closed.
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    Slowing down the CFM can make a big difference on...

    Slowing down the CFM can make a big difference on the indoor RH(5% or more depending on outdoor temp). But only when its warm enough outside for the A/C to need to run.

    Most likely they don't give...
  10. Yeah, its easy to miss.

    Yeah, its easy to miss.
  11. You mean this one?...

    You mean this one? https://hvac-talk.com/vbb/forumdisplay.php?19-Licensing-Laws-Codes-and-Certification
  12. Not practically. Since a conventional A/C would...

    Not practically. Since a conventional A/C would require a way for a large amount of ait to enter the basement to cool the condenser, and would need a blower added to it to force the high volume of...
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    Perhaps you might want to bring in an engineer to...

    Perhaps you might want to bring in an engineer to do your load calc and design.
  14. Probably can get the answer from Lennox.

    Probably can get the answer from Lennox.
  15. Sometimes the transformer hums.

    Sometimes the transformer hums.
  16. Have them clean the coils. It probably needs very...

    Have them clean the coils. It probably needs very very clean coils not to freeze up trying to get it to 58F.

    I don't see you mentioning needing it to be 58 in your other threads. Even see where...
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    You might want to use a separate unit for the...

    You might want to use a separate unit for the 16x24 area, if you intend to use it with the windows open at times.

    The reason why, is that the return duct will allow hot or higher humidity air to...
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    What was the load calc break down. As in how much...

    What was the load calc break down. As in how much sensible cooling and how much latent cooling.
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    Is there a frsh air intake connected to the...

    Is there a frsh air intake connected to the system. If so, it may be bring in too much outside air, and causing the humidity issue.

    Could also be the blower speed/CFM is set too high.
  20. Thread: AOPs

    by beenthere
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    Perhaps there is a fresh air intake that is not...

    Perhaps there is a fresh air intake that is not set up properly, and bring in too much fresh air causing that problem.

    Or perhaps its over sized.
  21. What ever brand you choose. Make sure the...

    What ever brand you choose. Make sure the contractor has training on it, and knows how to properly install, start up, and commission it. If not, you could end up with an expensive conversation piece....
  22. Moved to AOP.

    Moved to AOP.
  23. Replies
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    Moved to AOP.

    Moved to AOP.
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    Sorry, this is not a DIY site. Call a service...

    Sorry, this is not a DIY site.

    Call a service company out to fix your unit.

    Thread closed.
  25. Thread: copper wrap

    by beenthere
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    Moved to AOP.

    Moved to AOP.
  26. Replies
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    Moved to AOP.

    Moved to AOP.
  27. No temp change during the change of state.

    No temp change during the change of state.
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    What thermostat is controlling it?

    What thermostat is controlling it?
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    Merged thread.

    Merged thread.
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    No one but the membership committee ever see's...

    No one but the membership committee ever see's that info.



    Anyone can post a question in the AOP forum. But you need an * to answer someone elses thread.
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    You must have a much different calendar then I...

    You must have a much different calendar then I have.
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    Moved to AOP.

    Moved to AOP.
  33. Removing the coil to clean it is a very expensive...

    Removing the coil to clean it is a very expensive thing. Takes a lot of time, and the LLFD needs to be replaced when its the coil is reinstalled.
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    A really excellent contractor would do a load...

    A really excellent contractor would do a load Calc, and tell you what size you really need. Instead of just giving you the choice of 2 sizes to choose from, and then suffer the consequences of...
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    95PSIG low side with a 32F outside temp is a bit...

    95PSIG low side with a 32F outside temp is a bit high.

    Good diagnostics is done by knowing all the readings before and after adding refrigerant charge. So can only make a vague WAG. System now...
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    Without knowing what the vapor pressure was, and...

    Without knowing what the vapor pressure was, and the outdoor temp at the time of the readings. Hard to make a good guess.
  37. He doesn't.

    He doesn't.
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    Air handler turned wrong way for the plenum set...

    Air handler turned wrong way for the plenum set up you have. Return will tend to evaporate the water in that drain. The filter will load up quickly being that close to the floor.
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    Is this a heat pump system. If so, have you...

    Is this a heat pump system. If so, have you checked the outdoor unit.
  40. Its probably the secondary heat exchanger. ...

    Its probably the secondary heat exchanger.

    Carrier/Bryant units had a problem with their secondary heat exchangers.
  41. You've been told a good bit of BS, by the people...

    You've been told a good bit of BS, by the people you have been talking to. And I'm not referring to anyone posting in this thread.
  42. Thread: confused ?

    by beenthere
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    Generally, doesn't have to be registered to get...

    Generally, doesn't have to be registered to get the standard 20 year limited heat exchanger warranty.
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    Just describe the problem, answer any questions...

    Just describe the problem, answer any questions responders might have. And then when you have the 7 posty, you can post your pics.

    Many members just post a link to a host site, or type in the tiny...
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    Don't make post just to increase your post count.

    Don't make post just to increase your post count.
  45. Without the actual static numbers, hard to tell...

    Without the actual static numbers, hard to tell much. But good chance your return duct sizing is okay for 5 tons.

    PS: The system may not need to move 400 CFM per ton, good chance that it may only...
  46. 1. Yes. 2. Yes. 3. Yes.

    1. Yes.
    2. Yes.
    3. Yes.
  47. Keep the zoning system, and combine your 2 small...

    Keep the zoning system, and combine your 2 small zones. Get a 3 ton 2 stage heat pump. It will move less air in first stage so the zones will be quiet, and you won't have nuisance high pressure...
  48. So with MERV 8 4" filter, your TESP is .71",...

    So with MERV 8 4" filter, your TESP is .71", which isn't too bad. But your A/C coil is too restrictive.

    A good contractor will look at the PD of new coils before selecting one, if you tell him...
  49. Its a 2 stage furnace, with a VS/variable speed...

    Its a 2 stage furnace, with a VS/variable speed blower.

    While you may not be tackling wiring it yourself. To post how it should be wired. Would tell others that do want to wire it themselves, how...
  50. No, that is not correct. But can tend to make...

    No, that is not correct. But can tend to make more money from your customers.
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