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  1. #14
    Join Date
    Aug 2010
    Location
    West Monroe, LA
    Posts
    1,532
    Quote Originally Posted by beenthere View Post
    Far a way. Wonder how long it will take them to come out if any warranty work is needed.
    Beenthere brings up a good point. Might want to think about that from a possiable system warranty part stand point.

    While the carrier greenspread is a great system installed and sized properly but what if needs maintance or warranty work done? Since summer is coming and they are a good ways alway. Just something to think about.

    The xl16 is not a bad system but does lack good dehumdity control in certain cases like all (2) stage 1 compressor systems. If I have a customer that is looking at xl16 I always suggest a XL20i for the simple reason of true (2) stage system with (2) compressors with a 50/100 % ratio of operation.

    With the Xl20i odds are they will be in the same price backet as carrier greenspread while diffrent concepts with the same results intended which is the best comfort, energy saving etc...

    I would ask your Trane dealer to work up the price Diffrance between xl16 and xl20. More then licky the rebates, incentives etc... Will also apply towards the XL20 as the XL16 in some cases greater depending on current promotions and seer rating both for electic company and Trane.

  2. #15
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,371
    Quote Originally Posted by dkeener View Post
    Well... I think I am going to expand my thinking to include the Infinity Greenspeed. The dealers are a good distance away but the technology certainly looks interesting. Im far enough inland (6 miles) that I dont think salt air will give me a lot of problem.
    Paying twice as much for a very complicated cooling system that is unable to remove moisture without overcooling is not a solution to maintaining <50%RH.
    At the end of the cooling cycle to moisture on the large cooling coil re-evaporates back into the home. You end up with an overcooled home that is damp.
    A small whole house dehumidifier added to durable simple a/c provides the desired temperature and %RH desired with a minimum investment and minimal operating cost.
    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  3. #16
    Join Date
    Jul 2008
    Location
    Vero Beach, FL
    Posts
    23
    Looks like its going to be a Carrier Greenspeed 4 ton with touchscreen stat. Also adding returns in the dual master bedrooms. Load calc suggests 4 ton is just a touch small with current ceiling insulation so I will need to add a few more inches of blown in. Lineset will be replaced but run overhead instead of thru the underground chase. Contractor said that would help insure no rips in suction line insulation as well as allow liquid line to be insulated. Sound right? The suction line for this system is larger than the one currently present for the old Rheem 13 HP. The price was painful.. but.. should be a very nice system.

    Install date is 3/28.

    Speaking of insulation, anyone had any experience of spray foam on the bottom of the roof sheathing? Saw a house that a builder was highlighting that did that. Theory was to keep the heat out of the attic in the first place but made me wonder if it would compromise the life of the shingles.

  4. #17
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    IF 4 ton is a touch small, with a Greenspeed go for 5 ton. No penalty for oversizing slightly on this particular system. Both use the same size compressor, only the 5 ton can run a higher speed, as long as your ductwork can handle it. You can also limit the maximum RPM... so you could for example limit it to 4.5 tons. The price should be almost the same. WIth Greenspeed, from what I can tell, there's not mcuh need ot ever select the 2 tons or 4 ton models. Just go 3 or 5, the minimum capacity is the same respectively.

    Kep in mind that most equipment you need 400CFM/ton. Carrier equipemnt is usually a nominal of 350-375CFM/ton. I'm not sayign that's an excuse to undersize ducting. But it's something to be considered. THe exception is in hot dry climates where you need lots of airflow most of the year.

  5. #18
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    I have spray foam under my roof deck. I would use closed cell unless you plan to reroof and add a vapor barrier or a cool roof design. Open cell does not act as a vapro barrier and you'd be amazed at the vapor drive into the attic. So while the attic might stay under 90F, the RH can reach 70-75%.... higher than outdoor humidity. That's right, the composite structure of the shingles, deck and foam act like a desicant and the heat form the sun drives moisture inside.

    OTherwise, I think uinsulating the roof deck combined with a cool roof design and sealing the attic is the best design. Ventilated attics are an outdated concept that became popular after WWII as
    "modern" tract homes with truss style roofs that allowed open floor plans took over hte market and traditional home custruction fell by the wayside. after asphault shingles and lower cost construction methods took hold.... but rarely existed before then.

  6. #19
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,913
    Quote Originally Posted by motoguy128 View Post
    IF 4 ton is a touch small, with a Greenspeed go for 5 ton. No penalty for oversizing slightly on this particular system. Both use the same size compressor, only the 5 ton can run a higher speed, as long as your ductwork can handle it. You can also limit the maximum RPM... so you could for example limit it to 4.5 tons.
    I believe carrier recommends that you go up 1 ton from your A/C load with the Greenspeed.
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  7. #20
    Join Date
    Jul 2008
    Location
    Vero Beach, FL
    Posts
    23
    Another option offered by the contractor is a 4" Media filter with just el cheapo spun fiberglass filters in the return grilles to stop the big crap. Is this a good option? Seems like it would keep the noise at the returns down and be the best option to keep the coil clean? Its not terribly expensive and Im inclined to go for it. What are the recommended change intervals?

    Thanks!

  8. #21
    Join Date
    May 2007
    Location
    DC Metro Area (MD)
    Posts
    3,371
    Quote Originally Posted by dkeener View Post
    Another option offered by the contractor is a 4" Media filter with just el cheapo spun fiberglass filters in the return grilles to stop the big crap. Is this a good option? Seems like it would keep the noise at the returns down and be the best option to keep the coil clean? Its not terribly expensive and Im inclined to go for it. What are the recommended change intervals?

    Thanks!
    I do recommend the 4" filter. It's hard to say how often you have to change it -- every home and system is different. The average change interval is 6 months. The Infinity system monitors static and will tell you when you do need to change the filter, however.

  9. #22
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    On a 2 ton system a 20x25x5 MERV 10 "Air Bear" media filter lasts me about 9 months on my upstairs system with on average the blower running about 2/3rds of the time either on low or with the equipment. BUT, I have ceiling returns, hardwood floors, 3 occupants and no pets and we have the home professionally cleaned every other week (2 working professionals... it's well worth the cost) All 4 of those factors could cut filter life in 1/2.

    6 months is a good average for most systems. Less for a 4 or 5 tons system and a MERV 13 filter.

  10. #23
    Join Date
    Jul 2008
    Location
    Vero Beach, FL
    Posts
    23
    What method does Infinity use to determine need for defrost? simple time?, vacuum? something else?

  11. #24
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    Infinity looks at the lenght of hte last defrost period and sets the interval to the next defrost cycle. I"m not usre if it uses pressure or just looks at coil temp to know when to stop a call for defrost.

  12. #25
    Join Date
    Jul 2008
    Location
    Vero Beach, FL
    Posts
    23
    Its Installed... I think they did a great job... comments?

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  13. #26
    Join Date
    Jul 2008
    Location
    Vero Beach, FL
    Posts
    23
    A couple more....

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