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  1. Short term, Set the t-stat up and the a/c blower,...

    Short term, Set the t-stat up and the a/c blower, "on". Allow the dehu run for a couple hours and report the %RH after several hours of dehu only. Measure the supply temp/%RH.
    Regards Teddy Bear
    ...
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    Here is good advice. A/c only removes moisture...

    Here is good advice. A/c only removes moisture when runs for an hour. The first 15 mins. the coil/pan loads with 1-2 lbs. of moisture, then moisture starts tripping down the drain. At the end of...
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    A/c blowers that blow excess air are the cause of...

    A/c blowers that blow excess air are the cause of cause the high duct pressure that is stopping the 98H from blowing dry air into the a/c supply. In addition the a/c is not removing much moisture. ...
  4. Start by monitoring %RH. Battery powered monitor....

    Start by monitoring %RH. Battery powered monitor. <60%RH works for most items. If higher, put sensitive items in seald plastic totes or sealed plastic bags with damrids.
    Next find storage that...
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    Your fan motor has wiring that changes the fan...

    Your fan motor has wiring that changes the fan speed, your tech will be able to do this. Slow the fan until you a +6^F drop in dew point of the air as it passes through the cooling coil. 75^F,50%RH,...
  6. The 120 pint dehu will handle the space and is...

    The 120 pint dehu will handle the space and is more efficient. Locating the unit in the middle of the space is an option. Locating on one end with a single duct to the farthest corner to cause air...
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    Ideal is to connect the dehu return to the open...

    Ideal is to connect the dehu return to the open part of the home. The dehu supply connected to the a/c supply. This allows the dehu to operate with out the a/c fan. Not sure how that would effect...
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    OK, The a/c is a big part of real humidity...

    OK, The a/c is a big part of real humidity control in the home. The a/c and dehu are a team. When the a/c runs, it should be setup to maintain what you want. They are capable of 3-4 lbs of...
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    Avoid any fresh air to the crawlspace. It is...

    Avoid any fresh air to the crawlspace. It is loaded with moisture. A small amount of dry air from the dehu to the crawlspace would keep 50-60%RH.
    A/c fan when the dehu on? Sounds like you are...
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    Both of the a/cs are not setup to max moisture...

    Both of the a/cs are not setup to max moisture removal. How about- is the dehumidifier removing any moisture and how much? We need to know that the dehu is working. Temp/%RH comming out of the...
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    Your insulation must have an good air tight vapor...

    Your insulation must have an good air tight vapor barrier on the exterior. Best to use a foam rubber insulation and glue to the sweating surface after drying. Suggest a 1/2" thick insulation.
    Do not...
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    First, any chance to confirm that the dehu is...

    First, any chance to confirm that the dehu is removing moisture. About 3 lbs per hour at 75^F 50%RH. Also measure the temperature/%RH of the air comming from the dehu?
    What is the %RH when the a/c...
  13. Yes. If not easy to calibrate, mark the...

    Yes.
    If not easy to calibrate, mark the calibrate +- on the face of the device.
    This will be interesting.
    Regards Teddy Bear
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    But when dehumidifier runs without AC (e.g.,...

    But when dehumidifier runs without AC (e.g., overnight or early morning), things become very uneven. Whic fan are you referring to? Dehu or a/c fan?

    Clearly the duct connection of the...
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    With the 98H dry air into the a/c return, do not...

    With the 98H dry air into the a/c return, do not operate the dehu when the a/c runs. The warm dry air from the dehumidifier will decrease the moisture removed by the a/c equal to the amount of...
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    This the right idea. With this size a/c, slow...

    This the right idea. With this size a/c, slow the air flow to get below the 74% sensible/26%latent heat ratios.
    With this much over-sizing, we need <50%RH cooling during significant cooling loads. ...
  17. Fresh air when occupied is a big deal if the home...

    Fresh air when occupied is a big deal if the home is routinely unoccupied. No need for fresh air when unoccupied.
    Regards Teddy Bear
  18. The dew point of the air flowing through the...

    The dew point of the air flowing through the cooling coil should have a 5-7^F drop in dew point. Example, 75^F, 50%RH, a 55^F dew point in the space or at the return should supply +-49^F supply dew...
  19. Make sure that the salt water do not get into the...

    Make sure that the salt water do not get into the meters.
    Regards Teddy Bear
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    A restrive air filter, low refrigerant charge,...

    A restrive air filter, low refrigerant charge, and low air floor all could contribute to this unique problem.
    Fresh air from 6" inlet connected to your air handler will not bring large quantities of...
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    No matter what, you need a proper setup whatever...

    No matter what, you need a proper setup whatever you bought. A good tech can setup the a/c to provide the best dew point possible to make your home comfortable during med-to high cooling loads. The...
  22. ASHRAE suggest 60%RH as max. Exceeding 60%...

    ASHRAE suggest 60%RH as max. Exceeding 60% brings in the possibilities of mites and other insects.

    Is the space air enough to get a benefit of a dehumidifier? Something like the Santa Fe...
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    Connecting fresh air to the a/c return so hard to...

    Connecting fresh air to the a/c return so hard to manage because of the a/c cycle. Disconnect the fresh air from the a/c return and connect it to the dehumidifier return or leave it connected to the...
  24. Measure the temp/%RH in the space and at the...

    Measure the temp/%RH in the space and at the supply vent into the space.
    Regards Teddy Bear
  25. Wayne is on the right track. Lets say the room...

    Wayne is on the right track. Lets say the room temp is 75^F, 60%RH, a 60^F dew point. The cooling coil must supply air that is 5-10^F lower dew point to reduce the moisture in the space. So check...
  26. If you give us the temp/%RH in the space and the...

    If you give us the temp/%RH in the space and the supply temp/%RH we can comment on how your a/c is working. Please
    Regards Teddy Bear
  27. Hear is what you up against. It really high...

    Hear is what you up against. It really high humidity plus rain.

    809426

    This is about as high as the outdoor dew point gets.
    Anything below the dew point temperature will have condensate on...
  28. This is a real good moisture study. What town in...

    This is a real good moisture study. What town in FL are you in?
    The dehumidifier is a good fix if it is big enough to reduce the dew point well below the floor temperature. Any carpeting on the...
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    If you had a small moisture load, you could...

    If you had a small moisture load, you could approach the coil temperature. With typical humidity loads, the dew point of the air through a 45^F coil is about about 49^F. 75^F, 50%RH, a 55^F load is...
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    This is expected and is an important caution. ...

    This is expected and is an important caution.
    Here is what is happening. When the dehu takes the %RH lower than the a/c is able, the a/c cooling coil is not cold enough to remove any moisture when...
  31. A good point on quantifying the air change rate. ...

    A good point on quantifying the air change rate. Here is a device that will show the amount of fresh air passing through your home. It is a CO2 meter and data logger. Place the meter in the center...
  32. Usually for conversion to natural leakage at...

    Usually for conversion to natural leakage at average winter wind and temperature , you divide by 20. This would be about a fresh air change in 6 hours. This ok and indicates that during average...
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    Suggest 50%RH for a setting for the dehu. 35%RH...

    Suggest 50%RH for a setting for the dehu.
    35%RH setting will make it run most of the time and is uncomfortable.
    Keep us posted.
    Regards Teddy Bear
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    Talk about name recognition. Ultra-Aire is just...

    Talk about name recognition. Ultra-Aire is just down the road from Aprilaire here in Madison,WI. We are the pioneers in the dehumidifier equipment while they pioneered humidifiers.

    Do you have a...
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    Sucking on the return and supplying the dry air...

    Sucking on the return and supplying the dry air to?
    What % of time does the 98H run under various conditions? Does the dehu ever need to operature high cooling load conditions? This would be a sign...
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    Congrats! Mile stone number 1 & 2. Selecting a...

    Congrats! Mile stone number 1 & 2. Selecting a good whole house dehu, the Ultra-Air and getting a (good).

    Now for number 3. A good installation.
    Starts with optimizing your a/c for ideal...
  37. well ya! That is what happens, the moisture on...

    well ya!
    That is what happens, the moisture on the coil/pan evaporates back into the home however it can.
    Regards Teddy Bear
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    Is the a/c contractor Nuccio Heating and Air...

    Is the a/c contractor Nuccio Heating and Air Conditioning, Inc.? Looks like a first class operation. Are you still going with a whole dehumidifier for fresh filtered air and supplemental...
  39. My experience is that a properly sized a/c and...

    My experience is that a properly sized a/c and setting the stat up or off when routinely unoccupied, is practical in many settings and with many occupants. I do this with a FL house, It is unoccpied...
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    All the capacity loss is in the 20 ft. of flex...

    All the capacity loss is in the 20 ft. of flex duct, not the 4" hood.
    If you want a barn burner, get a 6X8 reducer and use 8" flex to the 4"Hood. At the 4" hood reduce the 8" down to 4". You get...
  41. http://www.fsec.ucf.edu/en/publications/pdf/FSEC-R...

    http://www.fsec.ucf.edu/en/publications/pdf/FSEC-RR-383-12.pdf

    Fl Solar research has various studies that will answer your question.
    Just a sample of some of their work.
    When you come up with...
  42. The fresh air's function is to keep the...

    The fresh air's function is to keep the pollutants from all of the materials in your from building up in your home and renew oxygen.
    During mild weather and temperatures, even leaky homes may only...
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    Now is also the time to consider adding...

    Now is also the time to consider adding supplemental dehumidification to handle the moisture from the occupants and infiltration/ventilation moisture air during evenings/rainy days when the a/c does...
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    Sure, a relay on the dehu fan circuit that closes...

    Sure, a relay on the dehu fan circuit that closes when ever the a/c-heating is used. But a better choice to operate the dehu fan whenever the home is occupied. There are many days when the dehu or...
  45. Basics are to connect the dehumidifier to draw...

    Basics are to connect the dehumidifier to draw house air from the open part of the home through the dehumidifier filtering/drying and supplying to the a/c supply duct, supply the dry air throughout...
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    Disconnect from the cold air return and connect...

    Disconnect from the cold air return and connect to the Ultra-Aire, Turning the dehu blower on will get you fresh air mixed will house air when the dehu fan runs. Run the dehu fan when the home is...
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    Sorry I posted on the you other post. Any chance...

    Sorry I posted on the you other post.
    Any chance you could email me the name of the contractor involved? I would like more details on all of that. We prefer to deal with wholesale/ac contractors as...
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    This is fine kittle of fish. May be it is time to...

    This is fine kittle of fish. May be it is time to lower your standards. If you can a good contractor to install a lessor dehumidifier correctly, it would be better than times of high humidity.
    Or...
  49. The highest air to the bedroom is with the door...

    The highest air to the bedroom is with the door open. Door closed with air dam is the least amount of supply. You are pressurizing the space forcing more air into the return and out through any...
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    Cantact Justin in customer service at Ultra-Aire...

    Cantact Justin in customer service at Ultra-Aire for details adjusting
    controller. 800 533 7533.
    It is important that not in a high temperature area which will lower the %RH reading. Make sure...
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