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  1. Doesn't look professional IMO.

    Doesn't look professional IMO.
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    There is no such thing as 4 ton evap coil. ...

    There is no such thing as 4 ton evap coil.

    There is a coil and outdoor unit that produce a specific amount of cooling at specific conditions that can be looked up in the manufacturers application...
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    Again I ask how do you know this? Without...

    Again I ask how do you know this?

    Without knowing the sensible heat ratio there is no information to calculate if greater latent removal is required.
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    I've also done1000's and need more info than what...

    I've also done1000's and need more info than what has been posted so far.

    How do you determine your air flow without knowing the SHR?
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    The gain as calculated is grater than 36000 the...

    The gain as calculated is grater than 36000 the nominal not actual capacity of a 3 ton system.

    Without knowing the SHR of the gain how can you calculate what size is required to meet the gain?
    ...
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    You need a system that will 100% meet the ...

    You need a system that will 100% meet the sensible gain, 100% meet the latent gain and not exceed the total gain by 115%. This is what is called proper equipment selection.

    I highly doubt 3...
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    The 150 CFM that's going into this room, did you...

    The 150 CFM that's going into this room, did you measure it? Or are you guessing based on the size of the duct and some made up friction rate?
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    No I'm not saying that. I'm saying in your...

    No I'm not saying that.

    I'm saying in your scenario if we have a properly sized and at least a half decent supply register selection and placement we can get equal (acceptable) H&C performance....
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    How many CFM were coming out of the supply in the...

    How many CFM were coming out of the supply in the office before the return was added and how many after?

    this can all be quantified :.02:
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    The thing is we don't have to: "let's just say...

    The thing is we don't have to:

    "let's just say he was supply 150 CFM of air"

    It can actually be quantified, there is no reason to throw made up scenarios out there. The room cooled off because...
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    ^ Really good analogy to explain why rooms don't...

    ^
    Really good analogy to explain why rooms don't get enough conditioned air if the door is closed and no pressure relief is provided.

    Here is another good one to understand how a forward incline...
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    Bbeerme, are you saying your added return only...

    Bbeerme, are you saying your added return only removes the extra heat the home office "sees" from the afternoon sun?

    I don't want to put words in your mouth but that is what I think I'm getting...
  13. http://www.buildingsciencetech.com/contractor-guid...

    http://www.buildingsciencetech.com/contractor-guide-to-home-performance.php

    Try that
  14. The book in the photo is the book I'm...

    The book in the photo is the book I'm recommending, should be $20 or less, try eBay maybe?
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    This group should really be commended, I'm...

    This group should really be commended, I'm serious.

    I've been involved in these very design discussions and it's really what turned me sour to this website. You get guys who have put the math to...
  16. http://www.trutechtools.com/Home-Performance-Curri...

    http://www.trutechtools.com/Home-Performance-Curriculum_p_1360.html

    If the link doesn't work Google hap haven us green home. He has a short and sweet 52 page book to help you get started.
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    Manual D is a requirement under title 24. Do...

    Manual D is a requirement under title 24.

    Do you do system design that is T- 24 compliant?

    IE Manaul J-S-D. A duct tightness test is also part of it if I recall correctly.
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    It starts with "in some structures " A bit...

    It starts with "in some structures "

    A bit different no?
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    Bingo. You're starting to follow. When you...

    Bingo.

    You're starting to follow.

    When you add return or a place for the air to get back to the blower and evap you are able to deliver BTUH's to replace the gain.

    All the supply needs is...
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    Thanks for taking the time to type all that out....

    Thanks for taking the time to type all that out. I see where you are coming from and agree and disagree with a lot of what you said.

    The one thing that really jumped out at me was where you said...
  21. Tax illegal activity? Or are you pro hookers...

    Tax illegal activity?

    Or are you pro hookers pimps and blow so they can be taxed?
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    How low are they keeping the thermostat? Raising...

    How low are they keeping the thermostat? Raising that could be a simple fix.
  23. Taxing hookers and pimps will fix social...

    Taxing hookers and pimps will fix social security, this is awesome.
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    I only have a a minute and will address a lot of...

    I only have a a minute and will address a lot of what you just wrote later but........

    If return (s) and their location really matters why don't we see systems with 1 central supply and whole...
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    I believe adding that return upstairs resulted in...

    I believe adding that return upstairs resulted in them being more comfortable.

    I also believe that whatever resources used beyond a return being added to the first floor were wasted.

    The...
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    ^I'm very interested in learning more about this....

    ^I'm very interested in learning more about this. what do you have?
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    If they are paying and think it helps I'd have no...

    If they are paying and think it helps I'd have no problem giving them what they asked for.

    I've placed data loggers at 4 different heights 4 or 5 feet away from central re turns and mocked them...
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    The cabinet is sweating because the surface...

    The cabinet is sweating because the surface temperature is below the surrounding airs dew point.

    You have to lower the dew point of that surrounding air or increase the temperature of the air in...
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    The return can't affect the air more than a foot...

    The return can't affect the air more than a foot or 2 away from the grill, so the idea that it will "pull" warmer or colder air is something that just wont happen.

    Multiple returns are > a single...
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    Blocking off the high or low depending on the...

    Blocking off the high or low depending on the season is flat out stupid. Please, no offense intended. The supplys effect the stratification of the air, not the returns.

    It's all about the blow,...
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    And some oil will be mixed with the refrigerant...

    And some oil will be mixed with the refrigerant as it goes back to the compressor through that little hole in the bend of the piping in the accumulator, there is no action or force to separate them....
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    1 psi per 2' of rise.

    1 psi per 2' of rise.
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    The idea that more than 1 return is required for...

    The idea that more than 1 return is required for a system to perform correctly is a farce. If all of the conected duct system is properly sized and properly installed you will get the designed CFM to...
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    1985

    1985
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    How have you seen exam questions without taking...

    How have you seen exam questions without taking an exam?
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    If your house is super tight you shouldn't have a...

    If your house is super tight you shouldn't have a hard time maintaining a higher RH in the cooler weather.

    Has a test on how tight the house is been performed?
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    The more water you condense from the flue gasses,...

    The more water you condense from the flue gasses, the more your eff increases.

    So in some configurations you loose more water vapor out the vent then in others.
  38. Thread: 407c

    by Ed Janowiak
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    In an existing system, no. You can't unless that...

    In an existing system, no. You can't unless that exsisting 22 system has POE oil in it.

    I have done a few dry ship units and used 407C, I like the performance and the cost.
  39. How do you get CO problems from a heat pump?

    How do you get CO problems from a heat pump?
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    Might work, might not. My guess is he fan will...

    Might work, might not. My guess is he fan will run but who knows how much air you'll move.

    BTW if the 2.5 you mention in the first post is in this unit, there is your problem, the 2.5 wasn't put...
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    ECM = electronically commutating motor. The end...

    ECM = electronically commutating motor. The end of the motor that holds the electronics is called to module.

    The way you are describing things is very confusing.

    Is the blower your trying to...
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    It is a proprietary motor made by Regal Beloit....

    It is a proprietary motor made by Regal Beloit. The GE name is a left over used for brand recognition.

    The 2.5 was found only in C/B equipment. You won't find a 2.5 in a Trane, 2.0 2.3 or a 3.0,...
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    The 2.5 was a proprietary motor to carrier /...

    The 2.5 was a proprietary motor to carrier / Bryant. There was a tool that could be used similar to the tech mate that is just for the 2.5. Your local C/B supplier should be able to get you one.
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    How do you know there was 38 oz of oil in the...

    How do you know there was 38 oz of oil in the compressor to start with, that number sounds like way too much, Resi compressors oil charge is usually expressed in CC's.
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    ^ ohms law stuff. I agree with the guy who...

    ^ ohms law stuff.


    I agree with the guy who pointed out the transformer issue, the system should have never run.
  46. Thread: Dual Fuel

    by Ed Janowiak
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    If my economic balance point is well below a temp...

    If my economic balance point is well below a temp where I'll get frost on the outdoor coil why would you want to set the heat pump to shut off if defrost cycles are required? That seems to defeat...
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    Target SH = [(3 x indoor wb) - 80 - ambient] / 2...

    Target SH = [(3 x indoor wb) - 80 - ambient] / 2 (°F)
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    Then what is your next move? 17 degree split...

    Then what is your next move?

    17 degree split low load low SH the unit is low on capacity, dry bulb split should be way higher. If there is a hint of low airflow problem the split should have been...
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    Or do CFM x TD x .317 = watts output Divide...

    Or do
    CFM x TD x .317 = watts output

    Divide by watts input to calculate COP 😁
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    BTUH/ (TD x 1,08 ) = CFM Amps x volts x 3.412=...

    BTUH/ (TD x 1,08 ) = CFM
    Amps x volts x 3.412= BTUH

    The 1.08 and 3.412 cancel out to 3.16
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