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Any Fujitsu guys out there?

ChrisJ
Member Posts: 14,961
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.


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
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Doesn't pushing the fan button cycle through fan speeds? There's also a humidity mode.steve0
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pecmsg said:The “A” next to the fan icon says Auto modeSTEVEusaPA said:Doesn't pushing the fan button cycle through fan speeds? There's also a humidity mode.
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 treatment0 -
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!0 -
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I'll try to find out.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?
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 treatment0 -
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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?Solid_Fuel_Man said: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 treatment0 -
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