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  1. #1
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    Difference in Trane A/C

    Had a quote for a 5 ton, 16 seer Trane Compressor 4TTR6061, straight cool with electric heat, with a Trane Air Handler Tem6A0C60. When the installers showed up thankfully I checked model numbers before they started and they were installing a 4TTR6060 compressor (I believe is only 14 seer) and an air handler with a completely different number that I didn't get a chance to write down. When I queried them about the difference, they called the office who blamed it on an order desk mistake. They took the incorrect units back and rescheduled installation.

    I'm left wondering if it was an honest mistake or whether I was getting scammed. I'm assuming the units being installed were cheaper?

  2. #2
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    5-TON ... _ _ _ ... I never spec a 5-ton due to VERY HIGH Probability of Air Distribution issues.

    Straight Electric: You must be located South of 27.7' N Latitude

    System Selection to be reviewed for SEER.
    4 & 5 ton systems frequently miss the mark on GENERAL series SEER rating.
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  3. #3
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    Not to avoid your question, but like Dan posted above I’d first want to know if my home really needed 5 tons, or if a heat pump would be more of an economical option instead of straight electric heat.
    I havent failed. Ive just found 10,000 ways that wont work. - Thomas Edison

    Its not whether you get knocked down, its whether you get up. - Vince Lombardi

    "In this house we obey the laws of thermodynamics" - Homer Simpson

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  4. #4
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    4TTR6060J1 with TEM6AOD60H = 15.0 SEER
    AHRI 8630748

    Q. Sensible COOLING 43,440 BTU/HR
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  5. #5
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    Thread Starter
    I live in SW Florida, 4,000 sq ft, two story house. I have 3 A/C units - 2 ton for upstairs, 2 ton for MBR, and a 5 ton for main level (incl 3 BR & 3 Bath).

  6. #6
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    9 tons for 4,000 square feet?!?!
    I’d want a load calculation to verify that.
    A heat pump could help save considerably on your energy usage.
    I havent failed. Ive just found 10,000 ways that wont work. - Thomas Edison

    Its not whether you get knocked down, its whether you get up. - Vince Lombardi

    "In this house we obey the laws of thermodynamics" - Homer Simpson

    Local 486 Instructor & Service Technician

  7. #7
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    Quote Originally Posted by BStrat View Post
    I live in SW Florida, 4,000 sq ft, two story house.

    I have 3 A/C units - 2 ton for upstairs, 2 ton for MBR,
    and a 5 ton for main level (incl 3 BR & 3 Bath).
    __ 9 tons for 4,000 Sq Feet … seems like a Rule-of-Thumb selection from 1964.

    __ SOUNDS LIKE GROSSLY MISCALCULATED EQUIPMENT SELECTION
    __ or was Your Residence built prior to 1980.

    __ DAN SW FL _ more Specifically South Lee County

    __ Recently constructed home would only need 4 or 5 tons TOTAL for realistic Design Temperatures

    You don't happen to set your thermostats to 69'F, DO You?


    My Gmail address: racingdan11
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  8. #8
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    Post the model number of the changed Air Handler, will be able to tell you the SEER and EER, or if you even have a matched system.

    You can’t go by the SEER rating of the OD unit alone, need the ID selection to get the AHRI number.

    Lastly when you figure all this out make sure your system gets registered, as manufacturers warranty decreases significantly if never registered.

  9. #9
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    They usually don't tell when they have a digit off like that. Both have LG compressors, 1 has a 3 bladed fan, other has a 2 blade. Usually some little tweek like changing the sensible heat ratio or maybe 1 has a better EER than the other since the SW requires a higher EER.

  10. #10
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    Quote Originally Posted by rider77 View Post
    9 tons for 4,000 square feet?!?!
    I’d want a load calculation to verify that.

    A heat pump could help save considerably on your energy usage.
    There is NO HEATING Necessary in SW FL most " Winters ".
    ASHRAE Fundamentals data: < 44'F for < 35 hours / year

    " END of Winter " could be the last week in January.

    A/C is definitely used Every month of the year.

    [ The only Heating is to keep the pool at 80'F + ]
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  11. #11
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    Quote Originally Posted by dan sw fl View Post
    There is NO HEATING Necessary in SW FL most " Winters ".
    ASHRAE Fundamentals data: < 44'F for < 35 hours / year

    A/C is used Every month of the year.

    [ The only Heating is to keep the pool at 80'F + ]
    Dan, that said, is there reason to have electric heat whatsoever here? Or a heat pump with no backup?
    I’ve heard of areas in Florida using heat pumps with no auxiliary heat but I’m admittedly somewhat dense on the idea.
    I havent failed. Ive just found 10,000 ways that wont work. - Thomas Edison

    Its not whether you get knocked down, its whether you get up. - Vince Lombardi

    "In this house we obey the laws of thermodynamics" - Homer Simpson

    Local 486 Instructor & Service Technician

  12. #12
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    Quote Originally Posted by rider77 View Post
    Dan, that said, is there reason to have electric heat whatsoever here?

    Or a heat pump with no backup?

    I’ve heard of areas in Florida using heat pumps with no auxiliary heat
    but I’m admittedly somewhat dense on the idea.
    All air handlers in IECC Climate Zone 1 ( 7 Counties in South Florida) will have heat strips.
    Some mid- January use may be required for a few/several days for ~ 3+ hours/day
    if one wishes to maintain ~ 74'F.

    Climate Zone 2 buildings are now required by FL Bldg Code to have heat pumps.
    Heat strips would always be installed for Emergency use IMO.
    Attached Images Attached Images  
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  13. #13
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    CONCEPTUAL BLOCK LOAD

    _ |. BLOCK LOAD .|_

    Q. SENSIBLE COOLING 55,300 BTU/HR

    __________
    SW FL __ 4,000 SF __
    BUILT __ ?

    WALLS / CMU; R-5 { minimal }
    CEILING R-30
    SLAB

    POOR QUALITY WINDOWS, SINGLE Pane
    TOTAL GLASS AREA: 500 SQ FT
    _________________________

    5+ Tons; NOT 9
    ~ 5 Tons, IF Windows are tinted OR 2nd floor walls are wood framing.

    No description of AHUs, duct locations or Year Built were provided.

    Heat Strip capacity Total: 13 KW
    Attached Images Attached Images   
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

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