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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...
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    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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    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
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    2,558

    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
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    1,605

    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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    2,710

    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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    1,173

    Why do you want to measure the air...

    Why do you want to measure the air speed(velocity)??
  9. Replies
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    1,453

    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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    1,453

    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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    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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    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
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    2,010

    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
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    1,389

    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!!!
  21. Replies
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    You are absolutely right!!

    You are absolutely right!!
  22. Replies
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    7,469

    I do like to gamble!!!!!

    I do like to gamble!!!!!
  23. Replies
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    7,469

    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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    3,151

    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...
  26. Replies
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    Exactly the same ,different warranties ,mabe.If...

    Exactly the same ,different warranties ,mabe.If using an air handler,maybe lower,and unacceptable air flow then your current system.
  27. Replies
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    In the most basic way,Yes.

    In the most basic way,Yes.
  28. Replies
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    It's common to size system for 17 to 20F less...

    It's common to size system for 17 to 20F less then the outdoor design temperature(in our area),but it can be correctly sized for 75 or 72F ,if that's what you want,and make it clear upfront.
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    Ditto.

    Ditto.
  30. Thread: A/c Filter medium

    by fl1
    Replies
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    583

    Check the filter,could be dirty.Coils and blower...

    Check the filter,could be dirty.Coils and blower could need cleaning,could be duct leaks.


    Call a Pro for what you can't check yourself.
  31. Thread: CFM Chart

    by fl1
    Replies
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    5,057

    Basic Manual D ,from http://www.acca.org ,is that...

    Basic Manual D ,from http://www.acca.org ,is that it depends on the total equivalent feet of duct in each system, to know what each size duct will move in cfms.
  32. Thread: New duct needed?

    by fl1
    Replies
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    The ESP ,what airflow issues do they see,and...

    The ESP ,what airflow issues do they see,and would it be possible to modify instaed of replace.
  33. Replies
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    VS can help get air to the farthest supply...

    VS can help get air to the farthest supply outlets from the indoor unit/fan,but it has limits and won't solve the worst ones.
  34. Replies
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    You have issues and they are with your...

    You have issues and they are with your contractor.you need 350cfms per ton .Face it the old sytem was handling your temps,and you know it moved less air .
  35. Replies
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    Most anything is better than a 3M!!!!!

    Most anything is better than a 3M!!!!!
  36. They aren't "well aware",for the most part,the...

    They aren't "well aware",for the most part,the believe,there own story,rules of thumb,etc.,add most couldn't do a Manual J ,S or D ,correctly if their life depended on it.

    Don't be surprised if...
  37. Replies
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    Manufacturers incentives are real,even if the...

    Manufacturers incentives are real,even if the dealer adds his portion of the rebate in,which we don't,sell at the same price,other then prices increases ,all year long.
  38. Replies
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    did I say it was just your opinion?? Fact is...

    did I say it was just your opinion??

    Fact is ,we purge with nitro,no problems.That's not just my opinion,it's based on around 2000 replacemnets,even more if I count those of others I know do the...
  39. Replies
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    3,144

    We haver been installing R410a systems since the...

    We haver been installing R410a systems since the late 90's,no need to change them.

    BTW ,this thread will just another with varied opinions,like the ones before on this subject.
  40. Replies
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    Good answer,hope Dan doen't add those...

    Good answer,hope Dan doen't add those extras.LOL!!!
  41. Thread: enough returns?

    by fl1
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    Depending on the entire duct system,length and...

    Depending on the entire duct system,length and turns/fittings,8"=<1/4 ton,12"=<2 tons.So you may have enough for 2.5 to 3.5 tons total.
  42. Replies
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    How many do you need and what are you willing to...

    How many do you need and what are you willing to Pay???
  43. Replies
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    You mean it doesn't???lol

    You mean it doesn't???lol
  44. Replies
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    717

    Actually the duct system and SEER can be...

    Actually the duct system and SEER can be related.IF you have undersized ducts and you go with high SEER wuth a variable speed blower,the undersized ducts increase the wattage the fan draws,so the...
  45. Thread: r-22 vs r-410a

    by fl1
    Replies
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    743

    And if a refrigeration component fails ,you may...

    And if a refrigeration component fails ,you may may need refrigerant.

    Check ot http://www.410a.com for info.!
  46. Replies
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    No such method,close but not as stated. Ask...

    No such method,close but not as stated.

    Ask for a copy of the design worksheet,etc.,sonds like a rule of thumb kinda guy.
  47. Replies
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    1,551

    What cfms ,do you have a cooling coil,what type...

    What cfms ,do you have a cooling coil,what type of filter.

    Complete model number??
  48. Thread: duct sizing

    by fl1
    Replies
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    600

    Check http://www.acca.org for a class in Man. D .

    Check http://www.acca.org for a class in Man. D .
  49. Thread: Goodman

    by fl1
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    Absolutely!!!lol

    Absolutely!!!lol
  50. Replies
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    Which brands use the GE 2.5 version motor,and...

    Which brands use the GE 2.5 version motor,and provide all the dehum. and cool to dehum. features as the Infinty,other then Bryant.

    Now you may not have a humidity problem you can't resolve,but...
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