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  1. Replies
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    If you can price the "whole " job correctly,then...

    If you can price the "whole " job correctly,then all you need to do is take out the equipment cost you would have paid,and any other materials they supply,plus any labor they will be doing.


    This...
  2. Replies
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    2,356

    Okay ,if they are so simple,how about detailing...

    Okay ,if they are so simple,how about detailing how you will design the duct sytem for a .4 in. wc, External Static Pressure.
  3. Replies
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    2,356

    It's certainly not the easiest,in fact to get a...

    It's certainly not the easiest,in fact to get a great design and installation,is more involved then plumbing or electric,IMHO.

    This site is not for DIY's ,no need to lose your "cool"(pun intended).
  4. Thread: run time

    by fl1
    Replies
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    2,379

    I'd take that ,over the oversizing you are doing...

    I'd take that ,over the oversizing you are doing any day.

    Fact is when you do the calc., then select the proper equipment,there's some oversizing ,based on the equipment specs. to the actual...
  5. Thread: Evap Coil Upsizing

    by fl1
    Replies
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    1,516

    Opinions vary,I'd use the old line set ,no...

    Opinions vary,I'd use the old line set ,no problem if it's the correct size.

    The 2.5 ton coil is likely a good match for the 2 ton outdoor unit.post the model numbers to be sure.


    No reason to...
  6. Replies
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    2,454

    I think he's sugesting you find a contractor that...

    I think he's sugesting you find a contractor that can test the static of the duct system ,and do a Manual j and D ,to get the correct size system and ducts.

    [Edited by fl1 on 09-04-2006 at 10:47...
  7. Replies
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    I'd go with company A,except for the commnet on...

    I'd go with company A,except for the commnet on how SEER is derived,they all use the same temps..



    I'd still go with A,but it's time to replace the old system too.
  8. Replies
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    Why do you want to measure the air...

    Why do you want to measure the air speed(velocity)??
  9. Replies
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    1,394

    Re: so...

    If you have a very "short" duct system(toyal equivalent length),you may have a relatively high Friction Rate ,which may result in smaller duct sizes ,that exceed the velocity reccommneded by Manual...
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    It can be too large ,but yours doesn't sound like...

    It can be too large ,but yours doesn't sound like a problem.
  11. Replies
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    1,394

    Manual D velocity limits are for noise ,not...

    Manual D velocity limits are for noise ,not sizing.
  12. Replies
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    New system will use a lot less energy,depending...

    New system will use a lot less energy,depending on it's rating SEER/HSPF/AFUE,so keeping it till it dies is costing you X dollars a month.Factor that in to replacing it,along with and repairs you...
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    No one can answer that without a lot more...

    No one can answer that without a lot more info.,tinner saying thay are sized perfectly ,is just messing with you.
  14. Replies
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    Have a Pro check the ESP(resistance of the duct...

    Have a Pro check the ESP(resistance of the duct system to air flow),and use the mfrs. fan data chart,to determine the air flow.

    A manual D ,from http://www.acca.org would be needed to determine if...
  15. Need the specs to know for syure,but when you add...

    Need the specs to know for syure,but when you add elbows,generally you need to increase to 8" ,never reduce the size.


    Manual D can be used to calculate the proper size .If you have the specs..
    ...
  16. Replies
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    677

    78 at the stat,72 at the return. Poor air...

    78 at the stat,72 at the return.


    Poor air flow,stratification,is the cause.Return is low,cold air is settking low,supply grilles don't have enough velocity to mix the air in the room.Where are...
  17. Replies
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    2,346

    If the room has more windows and/or walls, then...

    If the room has more windows and/or walls, then rooms of similar size,it needs more air flow thne similar sized rooms.
  18. Thread: ECM Blower motor

    by fl1
    Replies
    10
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    1,824

    I did look at it! That one can only move 2300...

    I did look at it!

    That one can only move 2300 approx. cfms at .5 static,and your duct system is likely 1.0 or better.
  19. Looks nice,wait until you get to enjoy, the...

    Looks nice,wait until you get to enjoy, the "Comfort"!!
  20. Thread: 2.5 to 3 tons?

    by fl1
    Replies
    12
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    1,269

    Larger system ,larger duct work ,or problems...

    Larger system ,larger duct work ,or problems ,unles you have a very large furnace.

    Insulate ,instead of going larger ,same indoor temp. less costly unit running even less!!!
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    You are absolutely right!!

    You are absolutely right!!
  22. Replies
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    6,982

    I do like to gamble!!!!!

    I do like to gamble!!!!!
  23. Replies
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    6,982

    Yeah ,you really have to know you stuff to post...

    Yeah ,you really have to know you stuff to post it on the internet,everybody else that posts knows what their talking about!!!LOL


    Sorry couldn't resist.
  24. More space equals more heat gain and loss,equals...

    More space equals more heat gain and loss,equals more air flow.Your current system may or may not have the needed capacity to satisfy this addition,plain and simple.


    An HVAC contractor should be...
  25. Thread: Return Location

    by fl1
    Replies
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    2,886

    The difference in a return and a gap under the...

    The difference in a return and a gap under the door,is more then you indicate.A ducted return has the static pressure of the ducts to move air,under the door ,thru the wall or jumper has no sts\atic...
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