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Old 07-23-2012, 08:22 PM   #1
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second condensation drain line


I have a heat pump in a hous I just bought. It has two drain lines. One drains to the outside of the house and drips water as expected. The second line just comes out of the unit and is not plumbed to outside. This line periodically runs (not drips) and I put a 5 gallon bucket and it fills up half to 3/4 in a day. What is happening? It is hot and humid outside.

Should this line be connected to the other one that goes outside? What is the difference?

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Old 07-23-2012, 08:29 PM   #2
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second condensation drain line


Are they close enough in proximity to where they could be joined and routed together? Either both outside or both to a floor drain. Where is the unit located? Not exactlly sure why there are two, is one connected toa drain pan beneath the unit? Anyway you could post a picture of what the setup is?

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Old 07-23-2012, 08:41 PM   #3
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The drains are right next to each other. they are above ground level and only one is connected to the drain pipe. it drips like you would expect. The one that is not connected but open runs periodically. When it runs, it really flows. 3 gal per day on hot and humid day.

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Old 07-23-2012, 08:42 PM   #4
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second condensation drain line


No photo here bobby.
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Old 07-23-2012, 08:43 PM   #5
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second condensation drain line


photo attached now
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Old 07-23-2012, 08:50 PM   #6
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second condensation drain line


You can connect them together, but I would re-install the drain with either a clear trap or a larger size pipe. I'm surprised that one runs that hard when the other drips. Perhaps the drain going outside is restricted somewhere. If the drain going outside is working properly the other drain is not needed...in my opinion.
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Old 07-23-2012, 11:06 PM   #7
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second condensation drain line


The higher drain is for overflow .
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Old 07-23-2012, 11:16 PM   #8
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second condensation drain line


Quote:
Originally Posted by bobelectric View Post
The higher drain is for overflow .
Looking at the picture it seems that the higher drain is piped,the overflow....and the normal drain is not.
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Old 07-24-2012, 06:16 AM   #9
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Min drain line may be restricted, and needs to be blown out.
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Old 07-24-2012, 06:22 AM   #10
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second condensation drain line


Ditto on the clog. I'd also encourage you to NOT plumb those two lines together. If you do, then a clog in the common line would plug up BOTH drains. Either run them out separately, or cap off the secondary drain.
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Old 07-24-2012, 07:12 AM   #11
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second condensation drain line


bobby, the lower drain is called the primary drain it should be piped outside, the higher drain is the secondary drain that flows if the primary drain gets clogged for any reason. So there should never be water coming out the higher(secondary) drain line. Pipe the secondary drain to another location as mentioned already and keep an eye on it.
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Old 07-24-2012, 07:38 AM   #12
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second condensation drain line


they are both into the condensate pan get a 3/4 slip PVC plug-HD use it only when you clean the pan,with it open like that it is sucking air in.that 3/4 bucket fill up will then go out the trapped line to the left as it should.that open fitting is a high drain point on the pan.tape over that vent line riser pipe and blow out the trapped line from within the pan with a piece of hose and wet paper towel into the line.
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Old 07-24-2012, 07:43 AM   #13
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second condensation drain line


How about flow safety switch

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