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  1. #1
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    Confused Aren't more Of You Installing - Thermostat with a Humidity Sensor

    In the case of a variable-speed furnace, its fan motor can work with an outdoor air conditioner and thermostat with a humidity sensor to provide the same effects to the indoor air. It will allow the conditioned air to be added to the home at a lower, consistent speed, pulling more moisture out of the indoor air. If the control senses that the space needs dehumidification but the temperature is at or near the setting, the system reacts by reducing compressor speed and decreasing airflow for maximum dehumidification. This allows the system to operate longer without drastically over-cooling the space. This also means that a homeowner could increase the cooling set point and still be comfortable because the humidity is under control.


    Wouldn't this make Common Sense for Florida , Alabama , Mississippi , Tennessee , GA . South Carolina , Etc. due to all
    the Rain We all get in these Area's ?

    That said : How come I'm Not seeing this done more Often . . .

  2. #2
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    Thread Starter
    I Know the Energy Star Folks would love to see this more Often !
    Saves Electricity - Hell Yeah !

  3. #3
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    Anderson, South Carolina, United States
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    We do do that but the best way to control humidity and temperature (i.e. Comfort) is with a properly sized single stage system with a ventilating whole house dehumidifier.

  4. #4
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    Atlanta GA area
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    My most sold and installed system...

    Is a VS furnace (built in dehum)... with media filter and single stage AC.
    Accounts for probably 65-75% of all installs.
    GA-HVAC-Tech

    Your comfort, Your way, Everyday!

    GA's basic rules of home heating and AC upgrades:
    *Installation is more important than the brand of equipment
    *The duct system keeps the house comfortable; the equipment only heats and cools (and dehumidifies)
    *Cheap is not good, good is not cheap; however expensive is not a guarantee of quality!
    Choose your contractor wisely!

  5. #5
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    Just from the title of the thread....Why install a thermostat with a humidity sensor...when they didn't pay for the airhandler that will take advantage of it???
    I wish I had a $1.00 for every response I deleted.....

    "Decidedly Superior in a twisted pathetic way".....

  6. #6
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    Yes that would work but if you do live in a humid climate it would also make sense to select an evap coil with a lower SHR rating. Slowing the speed of the blower down would help increase dehumidification but probably at the expense of sensible heat. Proper coil selection and a dedicated dehumidifer would make more sense.

  7. #7
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    Quote Originally Posted by QualityAssure View Post
    In the case of a variable-speed furnace, its fan motor can work with an outdoor air conditioner and thermostat with a humidity sensor to provide the same effects to the indoor air. It will allow the conditioned air to be added to the home at a lower, consistent speed, pulling more moisture out of the indoor air. If the control senses that the space needs dehumidification but the temperature is at or near the setting, the system reacts by reducing compressor speed and decreasing airflow for maximum dehumidification. This allows the system to operate longer without drastically over-cooling the space. This also means that a homeowner could increase the cooling set point and still be comfortable because the humidity is under control.


    Wouldn't this make Common Sense for Florida , Alabama , Mississippi , Tennessee , GA . South Carolina , Etc. due to all
    the Rain We all get in these Area's ?

    That said : How come I'm Not seeing this done more Often . . .
    Only certain systems have a compressor that will reduce speed. Those systems are expensive and come with the type of thermostat you are talking about. However even on single speed A/Cs that are connected to a VS blower they can still utilize a slower blower to better dehumidify.

    The problem comes down to price. Those thermostats are more expensive. $100 can often be the difference between getting or losing a job so many contractors don't add in the better thermostat in order to get the job. Better contractors sell the value of all the benefits the thermostat and other accessories can bring to provide better comfort to the homeowner.

  8. Likes kdean1 liked this post
  9. #8
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    I knew this without reading the entire thread...

    Ignoring the missing word, "why" at the beginning of the thread title, the answer is:

    "because most people will not pay for the equipment needed to do what you suggest."
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

    AOP Forum Rules:







  10. Likes Tech23, CircusEnvy, lions_lair liked this post
  11. #9
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    Thread Starter
    Coming South Look Me Up My System needs a Good Tweak to get it _ Run like it should ..

  12. #10
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    Jan 2015
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    East Tenn
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    Thread Starter
    My Issue :
    In the case of a variable-speed furnace, its fan motor can work with an outdoor air conditioner and thermostat with a humidity sensor to provide the same effects to the indoor air. It will allow the conditioned air to be added to the home at a lower, consistent speed, pulling more moisture out of the indoor air. If the control senses that the space needs dehumidification but the temperature is at or near the setting, the system reacts by reducing compressor speed and decreasing airflow for maximum dehumidification. This allows the system to operate longer without drastically over-cooling the space. This also means that a homeowner could increase the cooling set point and still be comfortable because the humidity is under control.

    This is in Trane's Literature somewhere ..

    This is what I Have Installed : BUT

    This is what I'm Getting :

    We are still having Humidity Issues . . . On Going
    Have done many Improvements to Home to stop this !

    Not Much Help ..

    Either the Built in Humidity Requirements on the XL624 are too High or it simply
    can't Control the MotherBoard ..in It's state where a Wire was Cut to Use it as Is
    By Your Tech when Installed ..I Believe Trane has made a Mistake ..

    The system does just the Opposite of what it's supposed to do .. which I'll talk about in
    a later Paragraph ..

    First Up the Built in Stat's Settings for Humidity ( What are those Set At ? )

    Not Installer Settings .. but ( BUILT IN ) ?


    Second Up the Air Handler passing Air Over the Coil is Set up to be 100 % Variable ..


    Only the A/C is 2 stage .

    Only the Heating is 2 Stage .

    Humidity Control is 100% Variable .. 100% Varible Air Handler ! The Stat or Mother Board that Operates the

    Air Handler should be Flowing way down only 10% or a Much Lower CFM it seems it's stuck in stage 1 . . 50% CFM during Cooling Mode . .
    Auto Mode - makes NO Difference . .


    When the First Stage of A/C Stops .. Instead it just Keep Pushing Air at around 40-50%

    which is Stage 1 - Stage 1 is Stopped .. this is Why the Humidity in Home is Pushed

    Right back up to 66%-68% this in a Dangerous Area of Mold - Promotion ..


    It Further is Not the way this System should be Running ..

    It should be Dropping to 10% Flow Rated CFM or Shutting Down .

    System Never Shuts Down Ever .. in .. Summer


    In Winter the System does a Short Run stage 1 then a Long Run stage 2

    And Runs Humidity Level to 40% - 35% Again the System is Not watching the Humidity

    At All ..in Winter more Stage 1 after Stage 2 would provide Better Humidity Control .

    In Winter the Unit will at Least _ Cycle

    There is No Such Cycling at All in Summer ..Nor a much Lower Air Flow of the 100%

    Variable Air Handler ..such as 10% during A/C Falling Off . It still pushes past 45-50%

    Air CFM - this doesn't allow Time enough for Stage 2 to come back on ..

    Nor as the Humidity Raises does stage 2 come back ON .. Hello Stat . . XL624



    Like I have stated the Mother Board is set up for State of Arizona ..

    Not South Eastern ------ Tn


    This Needs to be Sorted Out ... our next Communication will be Certified ..

    As We have to CYA ..on Warranty of Equipment . .



    Eng III Tech Support ..

    SO If You Anywhere Near : TN : Please Help as Trane is NOT Admitting to Bad Equipment . . or Very Poor Programming of the
    Internals with In the Stat !! ( NOT VERY GOOD HUMIDITY ) Recognization !!

  13. #11
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    May 2014
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    Sounds like you need to get all of the literature for all adjustable components then spend some time learning how to program the equipment.


    Quote Originally Posted by QualityAssure View Post
    My Issue :
    In the case of a variable-speed furnace, its fan motor can work with an outdoor air conditioner and thermostat with a humidity sensor to provide the same effects to the indoor air. It will allow the conditioned air to be added to the home at a lower, consistent speed, pulling more moisture out of the indoor air. If the control senses that the space needs dehumidification but the temperature is at or near the setting, the system reacts by reducing compressor speed and decreasing airflow for maximum dehumidification. This allows the system to operate longer without drastically over-cooling the space. This also means that a homeowner could increase the cooling set point and still be comfortable because the humidity is under control.

    This is in Trane's Literature somewhere ..

    This is what I Have Installed : BUT

    This is what I'm Getting :

    We are still having Humidity Issues . . . On Going
    Have done many Improvements to Home to stop this !

    Not Much Help ..

    Either the Built in Humidity Requirements on the XL624 are too High or it simply
    can't Control the MotherBoard ..in It's state where a Wire was Cut to Use it as Is
    By Your Tech when Installed ..I Believe Trane has made a Mistake ..

    The system does just the Opposite of what it's supposed to do .. which I'll talk about in
    a later Paragraph ..

    First Up the Built in Stat's Settings for Humidity ( What are those Set At ? )

    Not Installer Settings .. but ( BUILT IN ) ?


    Second Up the Air Handler passing Air Over the Coil is Set up to be 100 % Variable ..


    Only the A/C is 2 stage .

    Only the Heating is 2 Stage .

    Humidity Control is 100% Variable .. 100% Varible Air Handler ! The Stat or Mother Board that Operates the

    Air Handler should be Flowing way down only 10% or a Much Lower CFM it seems it's stuck in stage 1 . . 50% CFM during Cooling Mode . .
    Auto Mode - makes NO Difference . .


    When the First Stage of A/C Stops .. Instead it just Keep Pushing Air at around 40-50%

    which is Stage 1 - Stage 1 is Stopped .. this is Why the Humidity in Home is Pushed

    Right back up to 66%-68% this in a Dangerous Area of Mold - Promotion ..


    It Further is Not the way this System should be Running ..

    It should be Dropping to 10% Flow Rated CFM or Shutting Down .

    System Never Shuts Down Ever .. in .. Summer


    In Winter the System does a Short Run stage 1 then a Long Run stage 2

    And Runs Humidity Level to 40% - 35% Again the System is Not watching the Humidity

    At All ..in Winter more Stage 1 after Stage 2 would provide Better Humidity Control .

    In Winter the Unit will at Least _ Cycle

    There is No Such Cycling at All in Summer ..Nor a much Lower Air Flow of the 100%

    Variable Air Handler ..such as 10% during A/C Falling Off . It still pushes past 45-50%

    Air CFM - this doesn't allow Time enough for Stage 2 to come back on ..

    Nor as the Humidity Raises does stage 2 come back ON .. Hello Stat . . XL624



    Like I have stated the Mother Board is set up for State of Arizona ..

    Not South Eastern ------ Tn


    This Needs to be Sorted Out ... our next Communication will be Certified ..

    As We have to CYA ..on Warranty of Equipment . .



    Eng III Tech Support ..

    SO If You Anywhere Near : TN : Please Help as Trane is NOT Admitting to Bad Equipment . . or Very Poor Programming of the
    Internals with In the Stat !! ( NOT VERY GOOD HUMIDITY ) Recognization !!

  14. #12
    Join Date
    Aug 2011
    Location
    Fuquay varina, nc
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    Quote Originally Posted by QualityAssure View Post
    My Issue :
    In the case of a variable-speed furnace, its fan motor can work with an outdoor air conditioner and thermostat with a humidity sensor to provide the same effects to the indoor air. It will allow the conditioned air to be added to the home at a lower, consistent speed, pulling more moisture out of the indoor air. If the control senses that the space needs dehumidification but the temperature is at or near the setting, the system reacts by reducing compressor speed and decreasing airflow for maximum dehumidification. This allows the system to operate longer without drastically over-cooling the space. This also means that a homeowner could increase the cooling set point and still be comfortable because the humidity is under control.

    This is in Trane's Literature somewhere ..

    This is what I Have Installed : BUT

    This is what I'm Getting :

    We are still having Humidity Issues . . . On Going
    Have done many Improvements to Home to stop this !

    Not Much Help ..

    Either the Built in Humidity Requirements on the XL624 are too High or it simply
    can't Control the MotherBoard ..in It's state where a Wire was Cut to Use it as Is
    By Your Tech when Installed ..I Believe Trane has made a Mistake ..

    The system does just the Opposite of what it's supposed to do .. which I'll talk about in
    a later Paragraph ..

    First Up the Built in Stat's Settings for Humidity ( What are those Set At ? )

    Not Installer Settings .. but ( BUILT IN ) ?


    Second Up the Air Handler passing Air Over the Coil is Set up to be 100 % Variable ..


    Only the A/C is 2 stage .

    Only the Heating is 2 Stage .

    Humidity Control is 100% Variable .. 100% Varible Air Handler ! The Stat or Mother Board that Operates the

    Air Handler should be Flowing way down only 10% or a Much Lower CFM it seems it's stuck in stage 1 . . 50% CFM during Cooling Mode . .
    Auto Mode - makes NO Difference . .


    When the First Stage of A/C Stops .. Instead it just Keep Pushing Air at around 40-50%

    which is Stage 1 - Stage 1 is Stopped .. this is Why the Humidity in Home is Pushed

    Right back up to 66%-68% this in a Dangerous Area of Mold - Promotion ..


    It Further is Not the way this System should be Running ..

    It should be Dropping to 10% Flow Rated CFM or Shutting Down .

    System Never Shuts Down Ever .. in .. Summer


    In Winter the System does a Short Run stage 1 then a Long Run stage 2

    And Runs Humidity Level to 40% - 35% Again the System is Not watching the Humidity

    At All ..in Winter more Stage 1 after Stage 2 would provide Better Humidity Control .

    In Winter the Unit will at Least _ Cycle

    There is No Such Cycling at All in Summer ..Nor a much Lower Air Flow of the 100%

    Variable Air Handler ..such as 10% during A/C Falling Off . It still pushes past 45-50%

    Air CFM - this doesn't allow Time enough for Stage 2 to come back on ..

    Nor as the Humidity Raises does stage 2 come back ON .. Hello Stat . . XL624



    Like I have stated the Mother Board is set up for State of Arizona ..

    Not South Eastern ------ Tn


    This Needs to be Sorted Out ... our next Communication will be Certified ..

    As We have to CYA ..on Warranty of Equipment . .



    Eng III Tech Support ..

    SO If You Anywhere Near : TN : Please Help as Trane is NOT Admitting to Bad Equipment . . or Very Poor Programming of the
    Internals with In the Stat !! ( NOT VERY GOOD HUMIDITY ) Recognization !!
    Wow, lots to cover here... For starters, if they leave the fan switch to "ON" instead of auto, that can AND will RE-humidify a home and/or make the dehum function work constantly to combat it. I've had that a few times, leaving the fan run continuously will pick up humidity from the condensate sitting in the evap drain pan. Also, where is your humidity sensor located? If it's in the stat and located near laundry or primary bathroom, that will jack up your humidity. Also, you mentioned something about cutting a jumper. If my memory serves me correctly, the R to BK jumper needs to be removed at the board.

    Sent from my XT1080 using Tapatalk

  15. #13
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    Jan 2004
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    PA
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    Moved the hi jacking post to this thread.
    Contractor locator map

    How-to-apply-for-Professional

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

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