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  1. #14
    Join Date
    May 2007
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    DC Metro Area (MD)
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    3,350
    More surface area = warmer coil = less humidity removal (typically). Correct me if I'm wrong...

    Can you provide the model numbers of both units to compare specs?

  2. #15
    Join Date
    Apr 2008
    Location
    Alberta Canada
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    2,246
    I would think coil temperature would be close to same. But you would get more air passing through meaning more humidity removal. Correct me if I am wrong.
    Do it right the first time.

  3. #16
    Join Date
    May 2007
    Location
    DC Metro Area (MD)
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    3,350
    Well, from what I have read here, it seems that the general opinion is the larger the indoor coil, the lower the latent capacity typically (I guess it would be necessary to look at the technical specs for each matchup for latent and sensible capacities). Hopefully someone else can confirm.

  4. #17
    Join Date
    Apr 2008
    Location
    Alberta Canada
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    2,246
    Trying to see if the is something on RSES manual or website but can't see yet.
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  5. #18
    Join Date
    Jul 2008
    Posts
    7

    Model numbers

    While I could go with Carrier proper, I am thinking of going with Payne (which as I understand is the same manufacture, just different labels and cheaper).

    For Carrier it would be:
    I/U = PF1MNC025/FY4ANF024
    O/U = 25HCA324 (presumably 25HCA318 for 1.5-ton)

    For Payne:
    I/U = PF1MNC025
    O/U = PN3AN024 (PN3AN018 for the 1.5-ton)

    So, the proposal is to use the bolded models above.

  6. #19
    Join Date
    Apr 2008
    Location
    Alberta Canada
    Posts
    2,246

    your right

    Quote Originally Posted by RyanHughes View Post
    Well, from what I have read here, it seems that the general opinion is the larger the indoor coil, the lower the latent capacity typically (I guess it would be necessary to look at the technical specs for each matchup for latent and sensible capacities). Hopefully someone else can confirm.
    Yah it does make sense.
    Do it right the first time.

  7. #20
    Join Date
    Jul 2008
    Posts
    7

    Latent capacity

    Quote Originally Posted by 21degrees View Post
    Yah it does make sense.
    Does that mean it will be more efficient?

    And how is it different depending on whether in cooling or heating mode?

    Thanks

  8. #21
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,750
    Latent capacity is the moisture removal abiility.
    If you decrease latent, you usually increase SEER, but not always.
    And in humid areas, people tend to set their stat lower if teh humidity in their house is too high. Meaning they use more eletric to feel comfortable. Losing any savings they would have gotten.

    On a HP in heating mode. You get extra BTUs. But, with a time and temp defrost board, you could end up with extra defrost cycles. Which would lose you your savings at temps under 40°F.

    Coils should be matched for best performance to the load calc. Not just increased in size because it was heard it will improve SEER.
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  9. #22
    Join Date
    Jul 2008
    Posts
    7

    Help with HP sizing

    Coils should be matched for best performance to the load calc. Not just increased in size because it was heard it will improve SEER.
    It sounds like you are suggesting to just either go with a 1.5 or a 2-ton rather than mixing I/U and O/U. Frankly, that seems to make more sense to me too.

    It is just confusing when so many people are saying different things.

    Maybe I just need to ask this guy to do the Man J calculations.

    He wants to put in the 2-ton, and the only real reason he wants to downsize the O/U is to make sure it fits through the roof hatch.

    I think the 2-ton would fit through anyway, but like I said before, it sounds like 1.5-ton system is more appropriate for my apartment. That is based on what I've heard here.


    At this point, my only concern is whether mixing the two sizes is bad. So far, no one has really come out and said that -- only that it would be better if they were matched.

  10. #23
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,750
    Common for many brands to use a 1/2 ton larger rated indoor unit.
    Not all brands though.

    SAo, depending on which brand, its fine.
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