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Old 07-28-2014, 12:33 AM   #1
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Water drian issue for Mini split AC system


I have Mitsubishi mini split AC installed. The drain line is connected to my bathroom sink through the wall.

There seems to be a problem in draining the water (probably due to gravity). Hence the water is dripping through the Split AC(water is backing up). Please see the current water connection.

Any thoughts ?
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Old 07-28-2014, 05:22 AM   #2
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Water drian issue for Mini split AC system


The condensate line needs to run downhill the entire way.


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Old 07-28-2014, 08:41 AM   #3
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Water drian issue for Mini split AC system


Ben is right. That horizontal line probably has crud in it from poor drainage and the connection at the sink will plug from dirty water from the sink. Should be drained downhill to a drain and no large horizontal pieces. Crud wil build up there in the off season and gradually when running.
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Old 07-28-2014, 02:06 PM   #4
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Water drian issue for Mini split AC system


Got it. I thought the same. My plumber says, he ran out of the options. He can't provide further downhill. What are my options now ?
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Old 07-28-2014, 02:41 PM   #5
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Water drian issue for Mini split AC system


If it can be poked thru an exterior wall then let it run outside ( Ideal method )

If not Little Giant makes a mini condensate pump for them and you can pump it elsewhere. Have to read the install info carefully as to far far it can pump etc. May want to get the installer to research that and do it.

http://little-giantpump.com/little_g...455_ec-400.htm
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Old 07-28-2014, 03:36 PM   #6
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Water drian issue for Mini split AC system


Quote:
Originally Posted by yuri View Post
If it can be poked thru an exterior wall then let it run outside ( Ideal method )

If not Little Giant makes a mini condensate pump for them and you can pump it elsewhere. Have to read the install info carefully as to far far it can pump etc. May want to get the installer to research that and do it.

http://little-giantpump.com/little_g...455_ec-400.htm
Can we simply let it run outside in open ? One of the wall of the bathroom is exterior sidewalk wall. I can definitely try that option, if that is best option..

any other thoughts ?
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Old 07-28-2014, 03:46 PM   #7
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Water drian issue for Mini split AC system


We run all of our condensate lines outside if at all possible. It just makes it easier overall.


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Old 07-28-2014, 04:29 PM   #8
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Water drian issue for Mini split AC system


I would run it outside. There are no other options. Outside or to drain inside or pump it somewhere like a utility sink.
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Old 07-29-2014, 12:08 AM   #9
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Water drian issue for Mini split AC system


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I would run it outside. There are no other options. Outside or to drain inside or pump it somewhere like a utility sink.
When we say outside, we just leave it open to outside ?
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Old 07-29-2014, 05:06 AM   #10
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Water drian issue for Mini split AC system


How much higher is the mini then where it taps into the sink drain.
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Old 07-29-2014, 07:41 AM   #11
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Water drian issue for Mini split AC system


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When we say outside, we just leave it open to outside ?

Yes. Put an elbow on it and a piece of hose or pipe if it is going to make the wall look wet if that bothers you. You can get clear hose and plastic barbed type elbows and fittings at HDepot or use pex pipe.
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Last edited by yuri; 07-29-2014 at 07:43 AM.
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Old 07-29-2014, 08:25 AM   #12
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Water drian issue for Mini split AC system


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How much higher is the mini then where it taps into the sink drain.
Probably 7 ft high. The mini is installed on top of the wall .. just below the ceiling
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Old 07-29-2014, 03:37 PM   #13
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Water drian issue for Mini split AC system


Well, I'd check to see if anything is clogging the drain line. Even though it has a slight up hill there. It should drain. May even have a kink in the line at the unit.
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Old 07-29-2014, 04:00 PM   #14
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Water drian issue for Mini split AC system


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Well, I'd check to see if anything is clogging the drain line. Even though it has a slight up hill there. It should drain. May even have a kink in the line at the unit.
That is my worry also. Even if I change the exit, what if it does not drain.
How do I check the kink ? Do I need to break the wall or is it possible to see through the attic. I am trying to get in touch with the AC guy who installed it.. I am waiting for his response.
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Old 07-29-2014, 05:09 PM   #15
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Water drian issue for Mini split AC system


My experience is that dust/dirt is in the drain water and it eventually forms sludge/crud and especially in the off season. Never good to have any horizontal pipe in a gravity drain like that. Unless you want to clear it once a year with bleach it will eventually plug up.

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