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  1. #1
    Join Date
    Sep 2008
    Location
    Largo
    Posts
    78

    De-humidistat Question

    How do I ask this?.... Do they make a de-humidistat that will work to control the humidity regardless of what the temperature is? We install the TCONT803 all the time but they will run only if there is a call for cooling and will run up to 3 degrees below your setpoint temp to try and bring the humidity down. We are looking for something that will turn the air on if the humidity is too high regardless of the temperature. Thanks in advance for any help.

  2. #2
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,301
    Many furnaces and air handlers with variable speed blowers will have dehumidify on demand where they slow the blower if the humidity is above desired. Most work with a humidistat, seeing an open circuit as high humidity. There's some, Nordyne for example, that does it the other way requiring a dehumidistat. Or you can use a stat with that feature which many high end controls do.

  3. #3
    Join Date
    Oct 2011
    Location
    between here and over there
    Posts
    453
    What are you looking to achieve? I don't know if this will answer your question or not but here in Florida we use a Honeywell H46C 1166 dstat and wire it in series with the tstat breaking R (24v hot) and tell the customer to set the stat to COOL 78 and set the Dstat to 60% RH. When the home RH reaches or exceeds 60% RH it will energize the tstat and if the temp is at or above 78 it will cycle the compressor till the RH drops below the 60% set-point. Now we use these for the snowbirds who are gone during the hot humid summer months. they are not recommended to be used while the home is occupied. the point of doing this this way is to cut down on the run time/ cycles per hour thus cutting electric bill down saving the customer money when the home is unoccupied and regulating some what of the humidity.
    This is a two piece installation usually mounting the dtstat on the wall near the tstat and wiring them together with a short piece of tstat wire.. usually take about 25 min said and done to install and walk through with the home owner on how to use the device.

    This is only to regulate the humidity when the building is unoccupied.

  4. #4
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,534
    Quote Originally Posted by MetroAir View Post
    How do I ask this?.... Do they make a de-humidistat that will work to control the humidity regardless of what the temperature is? We install the TCONT803 all the time but they will run only if there is a call for cooling and will run up to 3 degrees below your setpoint temp to try and bring the humidity down. We are looking for something that will turn the air on if the humidity is too high regardless of the temperature. Thanks in advance for any help.
    They do make a dehumidistat that will reduce humidity when the temp is low. They are connected to a dehumidifier.
    Check out the Santa Fe / Ultra-Aire dehumidifiers.
    Over-cooling causes condensation in walls and on the ducts. Plus the colder temps are uncomfortable.
    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"

  5. #5
    Join Date
    Sep 2009
    Location
    Kennesaw, GA
    Posts
    584
    Honeywell iaq will do the job also. Also the Honeywell th8320 with dehumidification control. I think there is some white Roger but I haven't used them to really to comment.

  6. #6
    Join Date
    Sep 2008
    Location
    Florida
    Posts
    34
    The Honeywell IAQ works well. It has a feature called"Southern away" literally..its in the manual
    YOu press the hold button 3 times to engage.

    You preset the humidty and temp. in setup. Usually still 60% and 80ish.
    Also has a build it safety not to go below 76*

  7. #7
    Join Date
    Oct 2011
    Location
    between here and over there
    Posts
    453
    Quote Originally Posted by Bowtye8 View Post
    The Honeywell IAQ works well. It has a feature called"Southern away" literally..its in the manual
    YOu press the hold button 3 times to engage.

    You preset the humidty and temp. in setup. Usually still 60% and 80ish.
    Also has a build it safety not to go below 76*
    also another great choice. We sell them but there not as popular being the price is double for the IAQ vs the Honeywell H46C 1166.

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