Hi all, I've been reading posts from HVAC-TALK for a while, decided to ask for advice here
2 months ago I've got FTXR42EV1B9 / RXR42EV1B9 model indoor/outdoor units of Daikin Ururu Sarara installed, the reason I went with Ururu Sarara was to have humidification/dehumidification/air cleaning/refreshing at one unit. Had a lot of problems with installation, the installers being extremely clumsy in Turkey, also the unit's functions are really primitive, I would expect to be able to control temperature and humidity at the same time, like an auto function, but unit's all operating modes are really limited, requires constant control to match temperature and humidity levels. As there are only 3 humidity levels available and you can't humidify properly when you are cooling.
The first outdoor unit was defective, the air fan was broken, I had a feeling Daikin was sending faulty units to Turkey, also from the beginning the unit caused dampness/moisture, after getting an hygrometer I saw that the unit was pumping RH levels to 70%'s - although outside and inside levels were normally at 45% - which is an extreme change, and the unit does this at auto/dry cooling/cooling modes. Anyway I managed to get a replacement for both indoor/outdoor units, the outdoor unit actually got changed 2 times, so I tested 3 units, the clumsy installers stepped on the outside unit once and broke it, that's why the outdoor unit got changed twice.
No matter which mode the unit is in, after the specified temperature level is met, the unit starts increasing the humidity level in the room. (no matter the air refreshing/cleaning features are on or off)
For example lets say the room is 22 degrees, and the unit is set to cool to 23 degrees or dry cool to 23 degrees -- with dehumidification set to standard or hi, the humidity starts increasing from 40%'s to 70%'s
Without the unit operating, humidity levels stay the same, but with unit operating (operating but near idle), the humidity levels jumps to these levels in <30 minutes.
The solution is to turn the unit off after the desired temperature is met, which requires a lot of effort, turning the unit off and back on again. I've considered building an external arduino-based controller to govern the units functions, however I didn't start after reading that Daikin's IR protocols are complicated/cryptic.
The units were all made at 2008, that's what made me think that Daikin sent a faulty line to Turkey.
Does other air conditioning units cause humidity to increase as a side-effect? What could be the reason of this problem?
(My room is <30m2's and the unit is ~18000btu's - however the room isn't tightly separated from the home - a dry home at ~ 22-25 degrees)
Thanks in Advance