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Any Fujitsu guys out there?

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ChrisJ
ChrisJ Member Posts: 15,774
I'm trying to help my sister remotely with her Fujitsu mini split setup and I'm hoping someone can help.

The unit has two heads in bedrooms and then what looks like a ducted air handler for the rest of the house.

The house handled by the ducted part tends to run high humidity.  Like in the 60%+ area.

This is the thermostat she has.   Is there a way to make it run the fan on the lowest speed?  Is it already according to that water drop?  I know absolutely nothing about this thermostat so trying to do this remotely isn't working.



Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment

Comments

  • pecmsg
    pecmsg Member Posts: 4,883
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    The “A” next to the fan icon says Auto mode
    Solid_Fuel_Man
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
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    Doesn't pushing the fan button cycle through fan speeds? There's also a humidity mode.

    There was an error rendering this rich post.

  • ChrisJ
    ChrisJ Member Posts: 15,774
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    pecmsg said:
    The “A” next to the fan icon says Auto mode
    Doesn't pushing the fan button cycle through fan speeds? There's also a humidity mode.
    From what she said hitting the fan button didn't do anything.  I had her try holding it with also didn't do anything.

    I assume auto means variable speed but I'm not so sure it doesn't just mean auto on/off like Normal stat?


    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
  • Solid_Fuel_Man
    Solid_Fuel_Man Member Posts: 2,646
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    Should to be able to manually set the fan and have it not in Auto. But, with the air handler and multiple heads it may lock you out of manual for drying. This is due to freezup potential, and the unit not "knowing" what the pressure loss is of the ductwork. If it were a wall unit (ductless) then it would allow you to set the fan speed, this is due to no pressure loss from ducting. 

    Multiple heads just complicate the problem. 
    Serving Northern Maine HVAC & Controls. I burn wood, it smells good!
  • Big Ed_4
    Big Ed_4 Member Posts: 2,805
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    Works on cool but setting to humidity , it does not work well ? I would check the duct work , but where you are , I would tell her to set to cool ....

    There was an error rendering this rich post.

    Solid_Fuel_Man
  • HVACNUT
    HVACNUT Member Posts: 5,861
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    Don't know how old that is, but the newer ones need to be programmed to sense at the thermostat, not the thermistor in the air handler. 
    Is there a model number for the air handler?
    Solid_Fuel_ManChrisJ
  • ChrisJ
    ChrisJ Member Posts: 15,774
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    HVACNUT said:

    Don't know how old that is, but the newer ones need to be programmed to sense at the thermostat, not the thermistor in the air handler. 
    Is there a model number for the air handler?

    I'll try to find out.
    The house was built in 2018-2019.
    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
  • Solid_Fuel_Man
    Solid_Fuel_Man Member Posts: 2,646
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    Yes! There is an installer meun and you change it to sense at the stat not the return plenum. 
    Serving Northern Maine HVAC & Controls. I burn wood, it smells good!
    ChrisJ
  • ChrisJ
    ChrisJ Member Posts: 15,774
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    HVACNUT said:

    Don't know how old that is, but the newer ones need to be programmed to sense at the thermostat, not the thermistor in the air handler. 
    Is there a model number for the air handler?

    Yes! There is an installer meun and you change it to sense at the stat not the return plenum. 


    Air handler model : ARU24RLF

    How do I get into the installer menu to see how and if it was configured?
    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
  • HVACNUT
    HVACNUT Member Posts: 5,861
    edited September 2023
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    whoops, it came out 2,1,3.
    ChrisJmattmia2