Comparing SEER numbers or is it impossible? - Page 2
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  1. #14
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    Doc,

    With a two speed, SEER and EER rating ,is it tested in high or low speed ??

  2. #15
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    EER

    Doc, you have given some info that I was hungry for. For S.Texas EER would be closer to the real world we have a lot of days where overnight temperatures only get a little below 80, and the dewpoint is high as well. SEER test conditions specify a certain dewpoint, don't they? It seems the standard SEER temperature might work nationwide but its usefulness for us is debatable.

    If it would not be too much trouble, would you be able to look up EER for a slightly larger system: Trane XE-1200 3.5 ton AC with Am.Std. AUD-080-R9V4K (4.0T nominal airflow, 80K BTUH input). Or if you could assist with where to locate this kind of info myself, that would be great.

    Thanks very much -- P.Student

  3. #16
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    Doc, i work for a Ruud distributor have not seen anything on that model yet. Just the uara 16 seer. please send me a pdf or something to [no email addresses - site rules]. thanks !!!!!!

    [Edited by BC1 on 02-21-2005 at 05:00 PM]
    i belong to peta ... people eating tasty animals. all my opinions are just mine.

  4. #17
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    Originally posted by jpb2
    Doc, i work for a Ruud distributor have not seen anything on that model yet. Just the uara 16 seer. please send me a pdf or something to [no email addresses - site rules]. thanks !!!!!!

    [Edited by BC1 on 02-21-2005 at 05:00 PM]
    http://www.ruudac.com/products/Produ...ificModel=UASL

  5. #18
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    [QUOTE]Originally posted by jpb2
    [B]Doc, i work for a Ruud distributor have not seen anything on that model yet. Just the uara 16 seer. please send me a pdf or something to [no email addresses - site rules]. thanks !!!!!!

    [Edited by docholiday on 02-22-2005 at 12:24 AM]

  6. #19
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    QUOTE]Originally posted by jpb2
    [B]Doc, i work for a Ruud distributor have not seen anything on that model yet. Just the uara 16 seer. please send me a pdf or something to [no email addresses - site rules]. thanks !!!!!!

    [Edited by docholiday on 02-22-2005 at 07:54 AM]

  7. #20
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    QUOTE]Originally posted by jpb2
    Doc, i work for a Ruud distributor have not seen anything on that model yet. Just the uara 16 seer. please send me a pdf or something to [no email addresses - site rules]. thanks !!!!!!

    [Edited by BC1 on 02-21-2005 at 05:00 PM]
    [/QUOTE]

    Did you look on Rheemote?

    Dash, I dont know off hand, I put the books away.... Did I quote one incorectly? I didnt mean to pic on the blue oval, I was just pointing out something to show the difference. My guess (and this is a guess) is that SEER is figured at low speed since the load is small enough and EER would be at full load.

    p.Student, look it up on the ARI site or in the literature.

    Really my point was for those of us in the business, SEER isn't everything. You need to look at EER, especially in the deep south and COP and HSPF for heat pumps.

  8. #21
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    Check this site out! It will give you all the info you need to find out who has the best seer rating.....

    http://ariprimenet.org/

  9. #22
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    Doc,James i checked rheemote and found it today. then ups showed up with a promo package. Thanks for your help !!!!
    i belong to peta ... people eating tasty animals. all my opinions are just mine.

  10. #23
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    Now that you mention it, what is COP??
    Please step AWAY from the condensing unit.

  11. #24
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    Coefficence of preformance,
    Do any of the others Dehumidifiy like the carriers

  12. #25
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    Typicly if an ECM is used, its not big deal to have a dehum mode, its internal software and simple to do. For all intents and purposes its a 15% reduction of airflow from nominal switched by a humidity sensor. Im sure most mfg's have dehum, especially in their marquee products.

    Literature can be made difficult to understand sometimes.

    Its a good point to look at sensible latent capacities. Since Ruud didnt publish staging capacities with the furnace match and Carrier makes it somewhat difficult to use any standard format, it makes it hard to figure it with the match used. You would have to apply some capacity correction factors and power factors. Interpolation is allowed, but I didnt do that. So for ease of explaining look at the same 3 ton unit (in all fairlness I added the Carrier 37-30 since it is a closer match) with the recommended air handler at ARI conditions since that is what is generally published.

    Carrier1 3 ton 18 SEER 38TDB36-30 with FV4AN006 (16.5 SEER/ 12.25 EER)
    Carrier2 3 ton 18 SEER 38TDB37-30 with FV4AN006 (18 SEER/ 13.15 EER)
    Ruud 3 ton 18 SEER UASL with BHN24J (18 SEER / 13.48 to 15.15 EER)

    2nd stage, Nominal CFM
    Carrier1 = 36,530 total, 27,800 Sens, 8730 Latent (1200 cfm)
    Carrier2 = 37,550 total, 28,730 sens, 8820 latent (1200 cfm)
    Ruud = 37,600 total, 27,700 Sens, 9,900 latent (1150cfm)

    1st stage, Nominal CFM
    Carrier1 = 18,040 total, 17,050 sensible, 990 latent (825 cfm)
    Carrier2 = 18,530 total, 16,670 sens, 1860 latent (900cfm)
    Ruud = 26,400 total, 20,100 sens, 6300 latent (925 cfm)

    2nd stage, dehumidify mode
    Carrier1 = 34,670 total, 24,020 sens, 10650 latent (900 cfm)
    Carrier2 = 35,540 total, 24,680 sens, 10860 latent (900 cfm)
    Ruud = 36,600 total, 26,050 sens, 10,550 latent (975cfm)

    1st stage, dehumidify mode.
    Carrier1 = 17,980 total, 15030 sens, 2950 latent (650cfm)
    Carrier2 = 17,710 total, 14,010 sens, 3700 latent (600 cfm)
    Ruud = 26,500 total, 19,950 sens, 6550 latent (800 cfm)

    [Edited by docholiday on 02-23-2005 at 09:37 AM]

  13. #26
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    Doc ,That's some impressive latent capacity on the Rudd.

    Not that it would change the sensible heat ratio ,in comparison,but low speed/1st stage won't operate long at 95F outdoors.Plus 80 indoors is unlikely as well.Do you Rudd numbers for "TVA" conditions(75edb-63ewb)??


    Also,Ruud at nominal cfm is less total capacity, then at dehum. cfms??

    [Edited by dash on 02-23-2005 at 11:20 AM]

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