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AC unit not dehumidifying.

BigBuck

Member
So i have a 12000 btu window mount ac unit that is cooling my room. Its not in the window but is being vented with inline fans. It use to fill a 5 gallon bucket every few days. Now its not even producing a drop of water. It still keeps the room cool but humidity is becoming an issue. Is it possible for the dehumidifier to go out before the ac unit does?

Seams like it would all just go out at once.
 

Sam the Caveman

Good'n Greasy
Veteran
if its not running as much, it won't take out as much water. I'm guessing thats whats going on.

Otherwise it would not be cooling the room.
 

MIway

Registered User
Veteran
yeah doesn't really make sense... if it's cooling, then it's naturally producing condensate in the process, so there has to be water, which would make one think the drain from the pan/catch is clogged, but you would have water somewhere, leaking. so if you have no water, then it can't actually be cooling is my guess. maybe u'r just feeling the cooling effect of the fan blowing vs the unit actually functioning properly...? dunno, just my reasoning as it doesn't really make sense to me either...
 

BigBuck

Member
Its still running just as much.
there is no clog. No moisture is being created at all.
Im running 4 600w in a closed room so i KNOW it is cooling because otherwise the temp would shoot way up and i can still set it to whatever i want.
Humidity bounces from 25% to 50%+ and we have a 30 liter dehumidifier going in the room as well.
Thanks for the input but still not sure what is going on
 

Sam the Caveman

Good'n Greasy
Veteran
are there different fan speed settings apart from the compressor speeds?

the compressor may have a high and low speed, but is there a different controller for the fan speed?

Don't know that I've seen any like this on window units, but if the fan speed is on high that would explain it. The slower the fan speed the more humidity it will remove and less cooling it will do, just as a faster fan speed will do lots of cooling with little humidity removal.
 

BigBuck

Member
the compressor may have a high and low speed, but is there a different controller for the fan speed?

The slower the fan speed the more humidity it will remove and less cooling it will do, just as a faster fan speed will do lots of cooling with little humidity removal.

There is a different fan speed setting on the ac unit. I also built a box around the back of the ac unit and attached a 6inch fan used to exhaust the heat. I figured that if the ac unit had more air going through it would help but I have a fan speed controller I could use.
 

BigBuck

Member
the dehuy is working fine but its just not big enough to do the whole room. I got it after the ac unit quit dehumidifying. The other thing is when i set the ac unit to dry instead of cool, A) the temp goes up and B) the humidity seams to stay the same and the ac unit produces no water.

I use to fill a 5 gallon bucket every other day with it set to cool and on the same settings as it is now.
 

Granger2

Active member
Veteran
If you're having cooler temps, the AC is using cooler outside air to cool the coils. This causes it to work less to keep the room at the desired temp. The compressor is running fewer minutes per day to keep the desired temp, so it is also dehumidifying for fewer minutes per day. Cooler air has a lower capacity to hold water than warmer air. As a result it should not be "producing" as much condensate. -granger
 
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