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  1. #1

    Any Frigidaire AC experts here

    I had a new 14 seer Heat pump and variable speed furnace installed and am wondering if my system has dehumidificaiton feature. I can provide the furnace # and heat pump # if needeed? I am using a Vision Pro thermostat and do not see this feature on my thermostat.

  2. #2
    Join Date
    Aug 2002
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    Office and warehouse in both Crystal River & New Port Richey ,FL
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    18,836
    Post all the model numbers ,including the stat.,someone here will likely know.

    I hope it does have dehumidification control,as you went with a larger system,without a load calculation.

    http://www.hvac-talk.com/vbb/showthread.php?t=158774

  3. #3
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    67,903
    The 8321 has cool to dehumidify.
    It doesn't have the ability to slow the blower though.
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  4. #4
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,079
    The air handlers have had this capability for a while, the gas furnaces are just now adding this feature -- assuming you mean the dehumidify on demand that the Vision Pro IAQ is capable of.

  5. #5
    Join Date
    Feb 2006
    Location
    Somewhere in the midwest
    Posts
    405
    The blower has the ability to slow to 75% of the selected cooling cfm for maximum dehuhidification on the furnaces and A/H. A qualified servicer would know how to wire in a humidistat.
    Sound installation practices is the key to success. Equipment is only as good as the person installing it.

    If I can't fix it, it ain't broke.

  6. #6
    Join Date
    Jun 2003
    Location
    Chicago, IL
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    4,396
    Quote Originally Posted by BaldLoonie View Post
    the gas furnaces are just now adding this feature
    i installed one 2-3 years ago (the old split manifold style) and it had Dehum terminals on the board where you adjust the CFM

  7. #7
    Quote Originally Posted by dash View Post
    Post all the model numbers ,including the stat.,someone here will likely know.

    I hope it does have dehumidification control,as you went with a larger system,without a load calculation.

    http://www.hvac-talk.com/vbb/showthread.php?t=158774
    I have 2 neighbors in my neighborhood who had the load calcs done and they each have a 4 ton system(Same house as me. Facing the same direction and the closest one is one block over). I tried to get one done, but i was freezing with no heat pump in winter at the time. My wife was not happy and i lost $1000 in saltwater aquarium life from my system not working and was going to loose more. I had to make the best decision at the time and i feel i made the correct one. The other 2 techs that came over were horrible.

    This tech added another return and that has made the house cool and heat more evenly since I have had the new system.

    Their are some minor gripes with my install but I won't get into that.

    I will get my model #'s tonight and I am using a Vision Pro and iwll get the model #.

  8. #8
    Furnace Model # B5VM-T49K-C and Heat Pump Model FT5BD-048K.

    Thermostat is a Vision Pro Model # TH8320U1008

  9. #9
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,903
    That stat doesn't do cool to dehumidify.

    The YTH9421(known as the IAQ stat), would get you abetter use of your system.
    So would the Th8321. Not as good as the IAQ though.
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  10. #10
    Quote Originally Posted by beenthere View Post
    That stat doesn't do cool to dehumidify.

    The YTH9421(known as the IAQ stat), would get you abetter use of your system.
    So would the Th8321. Not as good as the IAQ though.
    Thanks I figured that out last night after researching it a bit more. I will get the correct one.

  11. #11
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
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    When they come back to install the stat,be sure to ask what they set the air handler to,as far as cfms(air flow),I'd recommend 350 cfms per ton ,for Florida.

  12. #12
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    Dash.
    Since the IAQ can keep the blower slowed down the entire cooling call. Which would be less then 350 per tom for many units. Do you still recomend 350 per ton for Florida for systems using the IAQ.
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  13. #13
    Join Date
    May 2007
    Location
    Naples, Fl
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    889
    I'm no Dash but I'll say that the 350 proves optimum. With the Southwest Florida summertime due point average being 74 degrees the less run time at the reduced discharge temps the better. The 350 per ton still provides improved dehumidification which reduces the amount of cool to dehumidify operatioin and in my book thats a good thing.

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