Question about Mitsubishi Mr. Slim MXZ30TN Air Conditioner

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My Mr. Slim seems to be making the room more humid while on the 'cool' setting. I turn it to the 'dry' setting and the humidity goes down but then when I turn it back to 'cool' it gets humid again. Is this normal?

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Make sure the unit is draining properly may need to clean out. also check the filters

Posted on Jul 18, 2010

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Just installed 5 units in my home. all four work


It sounds like the condensate from the drain pan is not draining correctly! The drain tube from your Air Handler unit may be kinked or not properly installed. The condensate water from the unit should be drained outside at least.

Jul 19, 2010 | Mitsubishi Mr. Slim MXZ30TN Air...

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Mr slim unit in bedroom 9kbtu - room 11x12'- is humid, awful


Lets clarify. DRY mode only dehumidifes that air and does not cool. Cool is used for cooling. Dry mode doesn't normally have temp control; it is automatically set by the unit. I think 9000btu is a big unit for the room; it is overkill. I would switch to a 5000btu unit. it cannot be fixed and the BR unit needs to be uninstalled and the new unit needs to be re-installed. The price of commisioning, de-commisioning and new unit is something in which you will have to pay.
I take the time to answer your questions, so please rate me.
Thankyou
Mat

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Moisture not collected


low on freon is the compressor running?

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Dehumidifier automatic on and off function not working


Unless you live in a dry environment or place the unit in a hermetically sealed room, it probably will not turn off. As the air dries within the room, more moisture comes in with the air. As long as the air outside of the room is more humid than the room this will be true.

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That is the mode setting.

The triangle is "I feel" mode. You adjust up or down according to how you feel

The star is "cool mode"

The wind or fan shape is for the "fan on/off" mode

And the rain drop is the "dry" mode to lower the humidity in the house.

Jan 24, 2009 | Mitsubishi Mr. Slim MXZ30TN Air...

7 Answers

What is the Dry setting on air conditioner?


Hi, I know this question's been up a while and I'm not sure if you care anymore but here goes anyway.

Most air conditioners are reverse cycle, so they can heat the air in your house or cool it down. What we are concerned with is the cooling side of things. So in this mode a working liquid is sprayed into the evaporator and cools its immediate surroundings. air is blown over the evaporator which cools the air. The local temperature around the evaporator is very cold, (how cold exactly I'm not sure) so the air in this region has a very poor ability to hold water and so (especially on a humid day) water condenses out of this air on the surface of the evaporator, is collected and drained away. The cooling function and dry function both use the "cooling" mechanism of the air conditioner. Both extract water from the air in this way but the primary purpose of the cooling function is to cool the air whereas the primary function of the dry setting is to dry the air... obvious I know.

Now in the dry setting the compressor will run with fan going at I imagine a relatively slow speed to chill and extract as much water from the air as possible and to minimise circulation. After a short time the compressor and fan will cut-out and then after a short interval start up again (I'm not really sure but I assume this is either controlled by a humidity sensor OR the temperature sensor monitors for a small change in temperature and shuts off the compressor and fan when it detects this). Now in cooling mode (depending on what temperature is set) the compressor will run for longer and more frequently and therefore remove more water. So why have a dry mode if cooling mode removes more water?... Well that really has the same answer as the question "when do I use dry mode?"

Well on a particular day where the temperature would normally be considered comfortable but on this day it is unusually humid, your body will find it difficult to radiate heat via sweat because of the already high RH (relative humidity) making you uncomfortable and feel "hot". Using dry mode will reduce this RH without adjusting the temperature by much, but you will perceive an ambient temperature drop due to your body being able to discard heat more easily... hence making you more "comfortable" in same way you would normally feel at that temperature.

On the contrary if you were to use cooling mode (which is regulated by temperature) you would have to set a temperature lower than ambient so that the compressor will "kick-in" rather than the air conditioner just running its fan...agree? So that means the air conditioner will reduce RH (which we want) giving you a perceived temp drop but it is also chasing the temperature which you set which will give a REAL temperature drop. So anyway the point is; if it was an unusually humid day on what would otherwise be a comfortable temperature, using cooling (remember the temp has to be set lower than ambient) instead of dry would result in you feeling cold very quickly due to the perceived AND real temperature drop.

So really the dry setting is for days which aren't too hot, but are humid.

I think my logic makes sense.

cheers Matt

May 30, 2008 | LG L1204R Air Conditioner

1 Answer

Short cycling


It doesn't sound like it has failed.

The whole point of the % setting is so that the room holds at that %. When the humidity drops lower than, it will kick in. When it raises to that number it will turn off.

If the on and off is bugging you try raising the percentage. Or lower the temperature of your house. Heating will dry out the air and cause your machine to kick in.

Good Luck.

Feb 18, 2008 | Hamilton Beach Cool Mist 05521 Humidifier

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