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  1. Replies
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    Mason, thx for the note. I'll have to check with...

    Mason, thx for the note. I'll have to check with the tech if he remembers what he said the RA temp was..
    That said, your attic temps are probably 20 deg lower than mine although I never measured it...
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    Your logic is faultless, however in my case,...

    Your logic is faultless, however in my case, house was fine with previous old 2t unit.. And now it isn't... Nothing has changed in the house, other than I keep my ground floor unit at even lower temp...
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    Great question! and exactly what I'd like to know...

    Great question! and exactly what I'd like to know myself..

    What I find baffling is that during the peak of the day (outside 102-103) the delta-t is more around 23 sometimes 24 deg. BUT when the...
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    Thanks Dogboy, I think you are saying what my...

    Thanks Dogboy, I think you are saying what my tech was saying... but still sometimes the system cannot achieve even 20 deg. below outdoor temperature for whatever reason... See post above for today's...
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    It is the Carrier warranty. Really? My...

    It is the Carrier warranty. Really? My understanding was that the other dealer can choose whether to pick up your warranty or not, basically they are not obliged to. Not sure if that means like "take...
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    Thanks for your offer, but as I bought >1y ago...

    Thanks for your offer, but as I bought >1y ago from these guys and got a 10y extended Labor and Parts warranty.. I'll have to stick to them. I am sure they will make things right sooner or later. I...
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    great advise! So normally my system should be...

    great advise!

    So normally my system should be able to hold 74-95 if outside temp is in the upper 90s?

    Today's temps (external-internal)
    14:00 98-78
    15:00 99-79
    16:00 103-79
    19:00...
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    I am with you... but I am no pro either, and I...

    I am with you... but I am no pro either, and I let the tech do his work..

    What's the implication of increasing CFM to 800 if the high setting is actually 660?? Will it do any good, or more damage...
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    Sorry copied wrong data: Compressor is...

    Sorry copied wrong data:
    Compressor is 24APA724A ! My bad
    Furnace is correct
  10. Replies
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    That's correct. Under the direction of Carrier...

    That's correct. Under the direction of Carrier support, he changed a switch. He told me that the controller will override that switch anyway, but doing that seemed to "unstuck" the system from the...
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    24ANA124A003 CSPHP2412ATA 58CVA070-1-12

    24ANA124A003

    CSPHP2412ATA

    58CVA070-1-12
  12. Replies
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    Tedkidd after buying that unit, not much $$ left!...

    Tedkidd after buying that unit, not much $$ left!
    And I don't understand why my 11y old Trane XE1200 2 ton was doing just fine!

    Update at midnight: outside temp at 83 and stat still not going...
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    Appreciate your opinion. Don't worry about...

    Appreciate your opinion.
    Don't worry about muddying water up, I just want to be able to speak intelligently and ask the right questions to my contractor. Tech will take care of the situation, no...
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    Thanks. So a fairly low total ESP with filters...

    Thanks.

    So a fairly low total ESP with filters in place can mean not enough air flow?
  15. Replies
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    I am interested in your comment: how about if...

    I am interested in your comment: how about if supply static is low instead?
    How do I deduce the breakdown if I only have the figure my Carrier Infinity stat shows?
  16. I had the same unit (4 ton and 2 ton): I replaced...

    I had the same unit (4 ton and 2 ton): I replaced the 2 ton with Carrier Performance and although tech is still in debugging mode, the unit has performed marvelously on humidity control and ok on...
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    I thought my 12y old XE1200 was noisy.. but when...

    I thought my 12y old XE1200 was noisy.. but when I switched to a Carrier Performance, I got just a marginal improvement on the noise side.
    Don't know about Trane, but I know that the Carrier top of...
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    In the first example, what would be the Sensible...

    In the first example, what would be the Sensible BTU if instead of 20 deg. you had 25 across coil? and what about if you had 700 CFM instead of 800 CFM?
  19. What does your stat show for CFM, Static...

    What does your stat show for CFM, Static pressure, and coil temperature?
  20. If it's any consolation, you are not the only...

    If it's any consolation, you are not the only one! I've got a Performance too (24APA7 2 tons, on 3 ton furnace) and I've got almost exactly the same problem as yours. Check out my thread for more...
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    1/ I think he did verify the compressor is...

    1/ I think he did verify the compressor is operating high stage by looking at the Infinity controller.. Not sure if any other way of checking that he could have checked..
    He did check the...
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    I think it was 90. I mean, when the shoved his...

    I think it was 90. I mean, when the shoved his thermometer inside the return insulation in the attic...

    Indoor temp at the t-stat was 79 or there about.
  23. Replies
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    Point well taken on the BTU, I didn't know that....

    Point well taken on the BTU, I didn't know that. I thought 2 ton is 2 ton.
    That said, Manual J said that this system should work but obviously it isn't...

    Sorry, did you say set the system to...
  24. Replies
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    Will ask him to check temp at all grilles, vs....

    Will ask him to check temp at all grilles, vs. temp at furnace level.
    I remember that when he installed the system he had said that temp at the grilles was not representative of real temp or temp...
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    by the way, last I checked the ducts were all...

    by the way, last I checked the ducts were all sealed very well and there was no apparent leak AT ALL, in the attic. I think they did a pretty professional job on that front... Can check again if...
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    How would they check for supply side leak and/or...

    How would they check for supply side leak and/or negative pressure? They didn't mention any of those.

    When they installed the system they added two return grilles (12x12 kind of) in two different...
  27. Replies
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    Tech stuck a thermometer in the insulation of the...

    Tech stuck a thermometer in the insulation of the return and in one of the supply ducts (both near the furnace) and told me that the drop was 25 deg.

    Supply ducts are all hooked to the furnace,...
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    It is indeed. As was the previous unit.

    It is indeed. As was the previous unit.
  29. Thread: 1 or 2 filters?

    by crayx4
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    So what if static pressure is still below 0.4??...

    So what if static pressure is still below 0.4?? Is there still restriction?
  30. Replies
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    Thanks for responding. Infinity Stat. A/C 2...

    Thanks for responding.

    Infinity Stat. A/C 2 stage (24APA7) 6 months old


    I meant, the system doesn't bring down the temperature to the set point...
    It hits thermostat settings only at night...
  31. Replies
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    Cannot bring down indoor t -Carrier Infinity

    My unit is a Carrier 2ton with 3 ton furnace, Infinity.
    Was told that Delta t measured in the coil is 25, and subcooling 12 while super heat 10 and all looks normal according to tech for...
  32. Thread: 1 or 2 filters?

    by crayx4
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    What's the drawback of having two filters in line...

    What's the drawback of having two filters in line in the return, one at the furnace level (4" media filter) and the second at the grille level (pleated 1")?
  33. Replies
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    Contractor told me to run them in series: he said...

    Contractor told me to run them in series: he said that if not, the return ducts will get dirty. He said to use the least obstructive cheap filter I can find for the return grille.

    Is around .60 ...
  34. Replies
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    I've got a 16x25" filter and two 12" square...

    I've got a 16x25" filter and two 12" square filters, that feed two returns (one directly on the furnace, and one before the furnace, both with extra 5" media filters.
    ESP was around 25" with brand...
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    I am still not getting the point, I think. ...

    I am still not getting the point, I think.

    Does a too-large return create slow air flow? Does that mean it also creates a too low static pressure or is static pressure generated AFTER air goes...
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    You seem to be the only dissenting opinion.. Can...

    You seem to be the only dissenting opinion.. Can you explain the concept?
    Yes, my returns passes through the attic, where the unit is installed.
  37. Replies
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    Too much return air?

    I often read about too little return air... but what are the cons of adding too much return air intakes in a system? Does that bring down static pressure too much? or is it only good as the furnace...
  38. Replies
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    Carrier slab vs. cased coils

    Which one is better for cleaning?
    I read in this forum cased is better but a Carrier dealer told me slab is much better to clean. Also Slab has slightly higher capacity than cased for the same...
  39. You should. In my experience, ACCA and NATE don't...

    You should. In my experience, ACCA and NATE don't necessarily mean that the person that is doing the calculation for you knows what he's talking about.. Again, this is just from my experience with...
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    Mike, thanks for the info. Any idea where I can...

    Mike, thanks for the info.
    Any idea where I can find the sensible and latent capacities for those coil combinations? Carrier doesn't show any info on that.
  41. Replies
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    Too cryptic to be any use! But thanks anyway

    Too cryptic to be any use! But thanks anyway
  42. Replies
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    Well, honestly, I don't understand why the...

    Well, honestly, I don't understand why the theoretical difference would depend on where the application is.. Maybe the practical. Theoretical by definition means that the conditions are pre-set.....
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    Ok let me rephrase it: Forget my needs, my...

    Ok let me rephrase it:

    Forget my needs, my contractor, what I am trying to do or what my contractor knows.. For all you know, I may be asking just to learn more about HVAC..

    Do YOU know the...
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    guys, I am not asking you to critique my...

    guys, I am not asking you to critique my contractor's choice.. I am asking you if YOU know the theoretical difference of applying one of those three evaporator coils to the specified condenser and...
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    I have asked him, but he doesn't know the...

    I have asked him, but he doesn't know the difference and he said he's gonna ask the Carrier rep.

    I thought with so many pro's here, someone would have a clue..

    I can't believe that if you use...
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    Why would you get no. 2 if they are all equal?...

    Why would you get no. 2 if they are all equal? The dealer didn't price them actually, but I am pretty sure they are the same cost. I was quoted just one of them, but I want to understand the...
  47. Replies
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    How do you make sure if a Carrier coil is...

    How do you make sure if a Carrier coil is tin-plated from the part number?
  48. Thread: Spend my money!

    by crayx4
    Replies
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    1,652

    Why do you recommend the XL14i? the only...

    Why do you recommend the XL14i? the only advantage seems to be a better insulated case.. Any other reasons??
    Someone did recommend an XR15, but the idea there was to pair a single stage with a...
  49. Thread: Spend my money!

    by crayx4
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    1,652

    For me it becomes sort of gimmicky ONLY if it's...

    For me it becomes sort of gimmicky ONLY if it's much more expensive.
    In my case, it's about the same price, so the only reason why I wouldn't get one vs. the other would be if the single stage...
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    three AHRI #: who can tell me the difference??

    3483730, 3483737, 3483746.
    I know they are the same system with different evaporator coils...
    But I've checked the specs and the capacities are the same apart from for the smallest one (200 BTUh...
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