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  1. #1

    New Trane system, 2010, whats the best way to get my humidity under control?

    I asked questions here back in 2010 prior to replacing my HVAC system. I have become increasingly unhappy with my system in that it doesn't keep my humidity below 60%. I see other humidity questions frequently asked in this forum but I don't see anything close to my situation so I appreciate any help with this. My system was replaced in late summer 2010 by a local authorized Trane dealer. Afterwards I was somewhat concerned about abilitiy to keep humidity low but did not question it until the spring of 2011 in which I had my local Trane dealer come and make adjustments, mainly lowering the fan speed.

    This spring 2012 my allergies were especially bad, I know it was a bad season in most of the country. I became so concerned with the humidity that I purchased a humidity gauge and then realized how high it was. It was then that I realized that my system is likely oversized for my house and then now nearly two years later I don't feel I can ask my Trane dealer to correct this. I explained to my Trane dealer that before the system was replaced I was comfortable at 74-75 in the summer and now find I have to set the temperature at 69-71 to get the humidity lower. I wish I could roll the clock back to two weeks after it was instaleld and I would ask that it be fixed. My Trane dealer is now mostly ignoring me after an additional check this spring. He told me then it was not set for Comfort R mode. He did that but it hasn't helped. I have told him that I would not expect him to replace my system this late but I just want to make sure it is working as well as it can.


    So here are a few details...hosue is a 1300 sq ft. ranch on a slab, house is very tight (i've had a blower door test), house had windows and doors replaced in 2009 with low e and argon glass. I have linved in the house since 2001 and my previous 2 ton system was very comfortable. I had a natural gas furnace. What I replaced it with with an XL15i 2.5 ton heat pump and natural gas XC80 furnace with a 3 ton coil and Trane Clean Effects. The let my Trane dealer recommend the size. I pressed my dealer to get me a more efficient system then he first recommended. I also find that when I walk into my house I find the air stale. I don't really know how to describe it. On a warm day 90+ at 5pm the system runs about 10 minutes on 10 minutes off. I don't believe this would be very efficent for dehumidifying the air. What can I do to better dehumidify the air in my house. Thanks for any replies.

  2. #2
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    Quote Originally Posted by supermaxhd View Post
    I asked questions here back in 2010 prior to replacing my HVAC system. I have become increasingly unhappy with my system in that it doesn't keep my humidity below 60%. I see other humidity questions frequently asked in this forum but I don't see anything close to my situation so I appreciate any help with this.


    ...house is a 1300 sq ft. ranch on a slab, house is very tight (i've had a blower door test), house had windows and doors replaced in 2009 with low e and argon glass.
    I have lived in the house since 2001 and my previous 2 ton system was very comfortable. I had a natural gas furnace.

    What I replaced it with was an XL15i 2.5 ton heat pump and natural gas XC80 furnace with a 3 ton coil and Trane Clean Effects.

    The let my Trane dealer recommend the size.

    I pressed my dealer to get me a more efficient system then he first recommended. I also find that when I walk into my house I find the air stale.

    I don't really know how to describe it. On a warm day 90+ at 5pm the system runs about 10 minutes on 10 minutes off.
    I don't believe this would be very efficent for dehumidifying the air. What can I do to better dehumidify the air in my house.
    No that you have painted yourself into a corner ... You need a smaller A/C unit OR a dehumidifier.

    http://ultra-aire.com/index.php?opti...id=65&Itemid=5

    At > 90'F it ought to run about 54 minutes out of 60.
    Last edited by dan sw fl; 08-21-2012 at 08:42 PM.
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  3. #3
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    Other then getting a new correctly sized unit. A whole house dehumidifier would work.
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  4. #4
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    Quote Originally Posted by dan sw fl View Post
    No that you have painted yourself into a corner ... You need a smaller A/C unit OR a dehumidifier.
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  5. #5
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    Max

    What is your location?

    What thermostat was installed with new system? Does existing thermostat have adjustment for CPH? If so any idea what yours is set at?

    Any idea of your blower setting as far as CFMs per ton?

    If your blower setting is at 350-400 CFMs/ton and comfort R is set correct but not giving you the result you need, perhaps a thermostat that has "dehumidify on demand" feature might be an alternative to a dehumidifier.

    Your blower fan is in auto setting for AC cooling?

    Just brainstorming.

    Post back.

    IMO

  6. #6
    Quote Originally Posted by tigerdunes View Post
    Max

    What is your location?

    What thermostat was installed with new system? Does existing thermostat have adjustment for CPH? If so any idea what yours is set at?

    Any idea of your blower setting as far as CFMs per ton?

    If your blower setting is at 350-400 CFMs/ton and comfort R is set correct but not giving you the result you need, perhaps a thermostat that has "dehumidify on demand" feature might be an alternative to a dehumidifier.

    Your blower fan is in auto setting for AC cooling?

    Just brainstorming.

    Post back.

    IMO


    Lexington KY

    Trane TCONT800 Series thermostat

    CPH adjustment, I don't think so, I have looked at all of the settings in the installer setup.

    blower setting CFM, don't know it

    Correction to first post, I said I had an XC80 but I have an XV80.

    Thermostat with dehumidify on demand, how would that work?

    thanks!

  7. #7
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    Quote Originally Posted by supermaxhd View Post
    Lexington KY

    Trane TCONT800 Series thermostat

    CPH adjustment, I don't think so, I have looked at all of the settings in the installer setup.

    blower setting CFM, don't know it

    Correction to first post, I said I had an XC80 but I have an XV80.

    Thermostat with dehumidify on demand, how would that work?

    thanks!
    1) Set the blower speed down (way-down) less than 300 cfm per ton.
    2) Make sure your thermostat has the ability to read humidity AND if it sees that the humidity level in the house is higher than your setting, it will turn the A/C on to remove the humidity. If you can find a good tech, he can do it easily. My house runs at 240 CFM per ton.
    3) If those 2 steps won't get your humidity level down, then get a humidifier.

    Good luck

  8. #8
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    Is your fan setting on your thermostat in "on" or "auto" ?

    Should be in auto so that you don't reintroduce humidity that evap coil has removed.

    Verify and post back.

    Are you familiar at all with dip switch settings in the controls inside your furnace?
    If not then forget about it. Installing dealer should come back and verify that Comfort R is set correctly and your CFMs/ton are set correctly.

    This should be your starting point. If this does not help, then we can come back to dehumidify on demand which would involve a different thermostat like HW VP IAQ model. Dehumidify on demand allows the var speed blower to run on low with HP condenser when humidity level is above your setting.

    Just curious. Did you have inside humidity issues with your old system?

    IMO

  9. #9
    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise, commentary or questions in other peoples threads. Please apply to the AOPC today, thank you.

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    Last edited by beenthere; 08-21-2012 at 11:54 PM. Reason: Non Pro * Member

  10. #10
    Quote Originally Posted by tigerdunes View Post
    Max

    Is your fan setting on your thermostat in "on" or "auto" ?

    Should be in auto so that you don't reintroduce humidity that evap coil has removed.

    Verify and post back.

    Are you familiar at all with dip switch settings in the controls inside your furnace?
    If not then forget about it. Installing dealer should come back and verify that Comfort R is set correctly and your CFMs/ton are set correctly.

    This should be your starting point. If this does not help, then we can come back to dehumidify on demand which would involve a different thermostat like HW VP IAQ model. Dehumidify on demand allows the var speed blower to run on low with HP condenser when humidity level is above your setting.

    Just curious. Did you have inside humidity issues with your old system?

    IMO
    I am using auto and experimented a little with circulate. Part of me wants to run in in 'on' because I paid a lot of extra money for the 'cleaneffects' air cleaner and don't feel I can fully benefit from it unless 'on'.

    I am not familiar with the dip switch settings but I am confident that is something I could check out.

    The old system was a 1994 10 seer American Standard. I had previously spent money to fix it and didn't want to spend more on it to get it fixed. The tax breaks made my new system made it very attractive and I felt I got a very good dea at the time. Yes, the old system was very comfortable at 74-75 while keeping humdity down.

  11. #11
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    jcool, this is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise, commentary or questions in other peoples threads. Please apply to the AOPC today, thank you.

    You can find the rules for posting and qualifications here.

    Your post has been deleted.
    Further infractions may result in loss of posting privileges.
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    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  12. #12
    I believe my installer had good intentions and felt the larger unit would help me on my heating side and it likely has. I don't believe any calculations were made when the system was sold to me. The owner of the business who sold it to me had been doing this work for 30+ years so I trused he would get it right. Since I didn't press the issue right after it was installed I feel this is mostly my problem at this point.

  13. #13
    Quote Originally Posted by just_opinion View Post
    1) Set the blower speed down (way-down) less than 300 cfm per ton.
    2) Make sure your thermostat has the ability to read humidity AND if it sees that the humidity level in the house is higher than your setting, it will turn the A/C on to remove the humidity. If you can find a good tech, he can do it easily. My house runs at 240 CFM per ton.
    3) If those 2 steps won't get your humidity level down, then get a humidifier.

    Good luck
    My thermostate does not read humdity. I think you mean I should get a dehumidifier. I have found that I have to set the thermostat at 67-68 sometimes to get the humdity down to 55%.

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