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Old 01-23-2012, 03:19 PM   #1
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Residential AC condensate drain by gravity.


First of all hi everyone, as this is my first post. Hopefully I do not screw up completely

I have a multi-split system in my apartment, in two rooms. Both of the AC units have condensate drains by gravity.

As this is a new system, it has never been used. And I just started to connect the condensate drains to the waste water drain line.

This is my system:



The drain is routed via garden hoses down to the PVC waste pipe.

Now the strange part - once I got everything connected the water will not drain and overflow from the driptray.
Once I disconnect the hose from the water trap, and place it in a bucket, everything drains just fine.



Any ideas what can be wrong? My though was that there is a need for a vent line or something, so the water would drain.
Something like this, what do you think?


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Old 01-23-2012, 03:47 PM   #2
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Residential AC condensate drain by gravity.


Not enough hydrostatic pressure to over come the water in the trap. Or there is a vapor lock in your trap, your vent may not be positioned in the right area.


Writer’s information is for discussion purpose only and should be confirmed by an independent source


Last edited by Hardway; 01-23-2012 at 04:13 PM.
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Old 01-23-2012, 04:05 PM   #3
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Residential AC condensate drain by gravity.


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Not enough hydrostatic pressureto over come the water in the trap. Or there is a vapor lock in you trap, your vent may not be positioned in the right area.


Writer’s information is for discussion purpose only and should be confirmed by an independent source
I presume if there would be not enough hydrostatic pressure, then I would see the water in the hoses above the trap, but the hoses are empty

I have no vent, in my drain (hose) lines.
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Old 01-23-2012, 04:11 PM   #4
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Residential AC condensate drain by gravity.


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Old 01-23-2012, 04:12 PM   #5
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Old 01-23-2012, 04:14 PM   #6
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Residential AC condensate drain by gravity.


you need a vent!
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Old 01-23-2012, 04:17 PM   #7
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Residential AC condensate drain by gravity.


In other words, all structures with plumbing have a vented stack. Your connections are terrible and catastrophicly wrong.

You need to tap into the main vent stack in the attic or wherever the stack is accessible in coordination with your units. You may need a plumber to do this if you are inexperienced with it.

They make special fittings to accomplish this. Your hose is illegal (3/4" pvc) and where it's connected at as well.
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Old 01-23-2012, 04:23 PM   #8
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Residential AC condensate drain by gravity.


You may be able to get away with the connections where you are in the wall, changing them to pvc, and it may be as simple as adding a trap. You'd need to check the mechanical codes in your area.
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Old 01-23-2012, 04:38 PM   #9
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Residential AC condensate drain by gravity.


Thank you for the tip guys, unfortunately these are the only PCV pipes that can be seen in the wall. And there is no access to any others.
If I remove the Trap and put the hoses directly in the PVC pipe everything works fine, but then I get sewage smell coming from the pipe, that is why I fitted the trap.
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Old 01-23-2012, 05:48 PM   #10
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Residential AC condensate drain by gravity.


If you have 80% gas furnace not 90 or higher then just run a condensation pump with the vinyl tubing out with line set's
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Old 01-23-2012, 05:57 PM   #11
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Residential AC condensate drain by gravity.


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If you have 80% gas furnace not 90 or higher then just run a condensation pump with the vinyl tubing out with line set's
Dont want to use the condensation pump really, as they are lound and then I cannot use the AC at night.
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Old 01-23-2012, 06:01 PM   #12
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Residential AC condensate drain by gravity.


Huh? Just put rubber cork blocks under the little giants. If that wakes you up then you need to find why you cannot sleep at night
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Old 01-23-2012, 06:06 PM   #13
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Residential AC condensate drain by gravity.


Utilitech 1/8-HP Thermoplastic 58 GPM Condensate Pump

Item #: 313500 | Model #: 59907-UTL1
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Old 01-23-2012, 06:09 PM   #14
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Residential AC condensate drain by gravity.


Sorry trying to show pic of it from lowes
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Old 01-23-2012, 06:10 PM   #15
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Residential AC condensate drain by gravity.


Tommorow I will try and remove one AHU hose from the 3piece fitting. If the water will drain from one of the AirHandlers, then I will fit one more 3piece fitting and run a hose up to the ceiling for ventilation purposes.

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