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  1. Replies
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    We really can't advise you from here on equipment...

    We really can't advise you from here on equipment choices for your unique situation.
    Does the duct system & return-air filter areas support 4-Ton airflow?
    A manual D should be performed on the...
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    You have the right ideas; make sure the install...

    You have the right ideas; make sure the install is performed properly & that the duct system is sealed tight & return-air filter areas are sized big enough.

    The delivered performance to the rooms...
  3. A 40-psig suction pressure with R-22 is around a...

    A 40-psig suction pressure with R-22 is around a 17F evaporator coil; that is way-off.
    The suction pressure needs to be around 62-psig for at least a 35F coil.

    What was the temp & humidity in...
  4. You're NO lightweight! You just did what far too...

    You're NO lightweight! You just did what far too many in the business don't do; but should do.

    Your calc is probably close enough because you don't want to jump to a 4-Ton; you can do what might...
  5. Well, a 3-Ton 2-stage 18-SEER Goodman on...

    Well, a 3-Ton 2-stage 18-SEER Goodman on high-stage @1250-CFM would just barely have enough Sensible at 75F indoors; @50% RH. Though the latent seems rather low in the load-calc. The Bryant model...
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    I suggest you do a load-calc on each floor to see...

    I suggest you do a load-calc on each floor to see what U come up with.
    http://www.loadcalc.net/

    Chicago (near O'Hare AP) 2.5% summer design 89F dry bulb & 76F Wet bulb; +55% RH that is humid;...
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    In what state & large city do you live near?...

    In what state & large city do you live near?
    Your existing unit appears to be a 4-Ton 13-SEER.

    Do your own free whole house preliminary load-calc.
    http://www.loadcalc.net/
  8. Did either contractor do a load-calc? If so;...

    Did either contractor do a load-calc?
    If so; what were the results?

    You need to do your own load-CALC, too.
    http://www.loadcalc.net/

    What state & major city do you live near?
  9. So, you think you found an open winding? Were...

    So, you think you found an open winding?
    Were your probes directly on the compressor terminals?

    I hope your DIY was done properly as done wrong it could cause compressor damage.

    It pays to...
  10. Was it actually a compressor burn-out? What...

    Was it actually a compressor burn-out?
    What proofs where you shown?

    Explain what all took place including the troubleshooting tests the Tech performed.
    What did the Tech actually tell you was...
  11. Replies
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    There needs to be 50-lbs. or more of pressure...

    There needs to be 50-lbs. or more of pressure differential between the high-side & low-side for the reversing valve to move all the way to the end.

    Check valves must seat totally closed or fully...
  12. The mad rush to get that extra SEER Rating has...

    The mad rush to get that extra SEER Rating has resulted in oversized indoor coils which in most climates results in less humidity control because the indoor coil is not optimally cold.

    Only in...
  13. Replies
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    Where else would you get this definitive in-depth...

    Where else would you get this definitive in-depth humidity control information?
    ...The BEAR'S GOLDEN RULES delivers it...this is a forum full of PROs that deliver Real Value to USERS.
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    Fuzzy; You are absolutely right on all counts....

    Fuzzy; You are absolutely right on all counts.
    Good comprehensive data & perspective.

    You want comfortable conditions during all those changing conditions.
    That is the kind of overview...
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    Fuzzy is right when it comes to the conditions he...

    Fuzzy is right when it comes to the conditions he describes; however, what is described in Peter Holts post indicates that the 5-Ton A/C on 2900-sf never under any conditions gets the humidity down...
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    Of course, it's not just the HVAC system, it's...

    Of course, it's not just the HVAC system, it's the local climate, the home, the duct system plus a quality install; yes 45-50% RH.
  17. Home is about 1300-sf furnace is 57,000- Btuh...

    Home is about 1300-sf furnace is 57,000- Btuh Output that's about 44-Btu per sf per hour. A 38,000-Btuh Output- would be about 29.2-Btu per sf per hour. By actual real-time testing it only requires...
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    What length of runtimes are you getting with your...

    What length of runtimes are you getting with your 5-Ton A/C and at what temp & wind conditions?
    Post all your test data findings here.

    I'm thinking your A/C may be considerably oversized...
    ...
  19. Well, in the heating mode most would want a...

    Well, in the heating mode most would want a little extra capacity.

    In cooling get it closer to running full-time at 75F Indoor Design Conditions; if it creeps up to 78 or even 80F for a very...
  20. I used the free whole house online load-calc...

    I used the free whole house online load-calc software & did a manual J on my home here in SW WI and it came to around 32,000-Btuh.
    Then I did my own spreadsheet load-calc & it came out a little...
  21. I shall defer to the knowledgeable techs on this...

    I shall defer to the knowledgeable techs on this forum to give you their opinions & good advice.

    There may or may not be competent enough techs in your area; though they ought to be abundantly...
  22. Replies
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    Thank you for helping to show others that they...

    Thank you for helping to show others that they can do these very important load-calcs.

    The equipment Brand is not important compared to the quality of a proper sequenced install covering all the...
  23. If it pulls it down to 67F on the hottest days...

    If it pulls it down to 67F on the hottest days it is not undersized even at only 2-Tons.
    The indoor coil is oversized for best humidity removal.

    I am also wondering if the blower CFM is set way...
  24. Replies
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    Great...! Take your time & use a 'capture screen...

    Great...!
    Take your time & use a 'capture screen shot' to upload your results to the forum, so we can help you evaluate what you've done.
  25. Replies
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    First, find out what equipment sizing you need by...

    First, find out what equipment sizing you need by doing a load-calc.
    I'd do them separately for each floor.
    http://www.loadcalc.net/ (It is Free to use.)

    Also, if possible, get at least one...
  26. Replies
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    On the coldest nights this past winter you should...

    On the coldest nights this past winter you should have kept track of the start & run times in minutes & the time of the next start.
    You divide total time between both starts into the burner runtime...
  27. The SEER difference is negligible, however, with...

    The SEER difference is negligible, however, with some Brands you don't get the scroll compressor & no TXV metering device which can be important.
  28. Replies
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    Lexington KY winter design is 8F; summer is 91 &...

    Lexington KY winter design is 8F; summer is 91 & 76F wet bulb or about 50% RH. The North tip would be using Cincinnati OH 6F & 90F 75F, same 50% RH.



    The furnace can be sized way down; the...
  29. Replies
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    You say the unit is 20 yrs old, a 1995 A/C would...

    You say the unit is 20 yrs old, a 1995 A/C would be a 10 or 12 SEER; at 50% RH indoors the condenser temp above the outside temp should be around 20 to 24F; the indoor temp-split should be around...
  30. Poll: There is nothing automatic concerning SEER...

    There is nothing automatic concerning SEER Ratings; what SEER the system actually gets depends on many critically important factors whereby a 14-SEER may get far less SEER & EER, even in bad...
  31. Prices are not allowed on this forum; edit them...

    Prices are not allowed on this forum; edit them off if it's not too late.



    Should be a good performer.

    Ask your contractor how he will handle the transition area to the wider coil.
  32. A little too generic, huh. :grin2:

    A little too generic, huh. :grin2:
  33. Some programmable TH's allow you or a tech to...

    Some programmable TH's allow you or a tech to recalibrate the temp-setting up to +/- 5F; read the TH instructions on that TH.

    You could have an outdoor temp-motor-modulator put on the condenser...
  34. Poll: In Detroit heating is the major concern & the...

    In Detroit heating is the major concern & the blower on the existing furnace may not get the CFM down enough in the cooling mode to properly dehumidify; that's very important for comfort from 75 to...
  35. Replies
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    Everyone should do a load-calc on their home; if...

    Everyone should do a load-calc on their home; if U can't find anyone to do it; do it with other family members helping you:
    http://www.loadcalc.net/
  36. Sounds more like a delayed ignition problem, also...

    Sounds more like a delayed ignition problem, also too much combustion air can cause delayed ignition.

    If the oil does not ignite when it should or, if the furnace locks-out due to no ignition;...
  37. If you can see the make & model number; though it...

    If you can see the make & model number; though it could have a piston orifice metering device, if it does its orifice number would have to match the new 3-Ton condenser; though I'd prefer installing...
  38. Replies
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    Your house must be really large &/or not very...

    Your house must be really large &/or not very energy efficient to need 110K; 88-K output with Winter Design at 13F.

    What are the Btu Ratings of the Bryant 925T 2-stage?
    What is its complete...
  39. Does evaporator have a TXV that covers a 3-Ton...

    Does evaporator have a TXV that covers a 3-Ton system condenser? I'd want one...

    If it actually takes 3-Ton, & everything else is compatible, then U could switch.
  40. A major problem with residential 5-Ton units is...

    A major problem with residential 5-Ton units is that the duct system & return air filter areas are 'nearly always' too small which drops the Btuh way down.

    I question if their load-calcs & sizing...
  41. First; prices are not allowed on this forum,...

    First; prices are not allowed on this forum, delete them if it's not too late to EDIT; otherwise beenthere will be along to edit them out.

    You really need to do or have performed a load-calc &...
  42. DO NOT TRY TO TROUBLESHOOT & FIX THIS PROBLEM! ...

    DO NOT TRY TO TROUBLESHOOT & FIX THIS PROBLEM!

    Do U live in an area where there are cottonwood trees?
    They can plug a condenser coil & greatly reduce its heat ejection.

    Is the outdoor fan...
  43. Replies
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    In the cooling mode if the supply air diffusers &...

    In the cooling mode if the supply air diffusers & return air grilles are properly located, the air in the warm vaulted ceiling area will actually act as an insulator slowing the conduction rate &...
  44. Replies
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    Some new installs only deliver 59 to 63% of their...

    Some new installs only deliver 59 to 63% of their nominal Ratings due to bad/poor installs & poor engineer design work.

    We are NOT just talking about the duct system & airflow problems, we are...
  45. Replies
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    If no one will do the calc & SIZING, or they want...

    If no one will do the calc & SIZING, or they want to charge you too much, here is a free whole house calc & sizing that you can use; get others to help you so it becomes fun to do it. After you get...
  46. If you live in the North /zone a 13-SEER is okay....

    If you live in the North /zone a 13-SEER is okay.
    Evidently you live in a 14-SEER Zone.

    You will need at least a whole house load-calc & sizing...
    Here is a free load-calc with sizing; which...
  47. Replies
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    The duct system & filter area should be checked...

    The duct system & filter area should be checked to see if it will operate within the listed best ESP static numbers.
    The 2-stage VS TZ96MDV060B30A has an Output of 39,200-Btuh on 1st stage low fire;...
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    In order to keep wattage draw low proper duct...

    In order to keep wattage draw low proper duct design & filter size areas plus filter type are very important when using VS ECM blower motors.

    I like all the things that an ECM can do...for...
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    IMO, the HVAC consumer needs to see & understand...

    IMO, the HVAC consumer needs to see & understand what techs need to know & why they need to do it in the proper sequence; it's not so simple, & far too many don't begin to do it right...
    ...
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    Knowing how to apply every aspect of wet bulb-dry...

    Knowing how to apply every aspect of wet bulb-dry bulb numbers is very important; I am surprised they are not teaching it.
    Only one example: you can use enthalpy change between the wet bulb...
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