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Old 08-20-2015, 03:38 PM   #1
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Looking at plumbing dehumidifier


I finished up my finish basement, though I am getting tired of emptying out the tank. I have a slop sink on the same outside wall as the dehumidifier. I would like to add a a "T" fitting to the sewer side of the trap, reduce the diameter of the pipe going to the dehumidifier to 1.5", add an inline trap, then connect the hose of the dehumidifier to the drain pipe. I would like to make sure I do this in a proper manner and I am pretty sure the outlet for the dehumidifier has to be GFCI. I know I need to have 1/4" for every foot. I am curious do I also need some type of vent and am I doing anything wrong in my theory/plan? The sink is sits next to a large diameter PVC pipe, 6" I think.
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Old 08-20-2015, 03:49 PM   #2
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Any chance of installing the DH above the slope sink right next to it?
If so you can just drop the DH hose over the edge of the sink. No plumbing involved.
Just make sure it can't roll of if its on wheels.

Old washer hoses work well for short drain lines
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Old 08-20-2015, 03:59 PM   #3
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You could get a condensate pump and some tubing. Have the dehumidifier drain into the pump and run the tubing to the sink.
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Old 08-20-2015, 04:08 PM   #4
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Quote:
Originally Posted by Solaritu View Post
I am curious do I also need some type of vent and am I doing anything wrong in my theory/plan?
The problem will be with the trap when there's no water in it. Sewer gas will get into the house unless you cap the trap when the unit is not in use(in the Winter months.)
The condensate pump is what I use on the older unit.
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Old 08-20-2015, 04:13 PM   #5
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No floor drain in the basement? Or storm sump?
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Old 08-20-2015, 04:51 PM   #6
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Funny thing. I have a condensation pump for my ac and humidifier. I have another dehumidifier on a shelf draining into the sink for the unfinished side. I might go the condensation pump route, will need to install two outlets if I do. I was hoping for a more passive method
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Old 08-20-2015, 07:56 PM   #7
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I sold my parents condo a while back. The builder had drained the condensate pump for the furnace directly into a sewer line. No no. We had to a trap into a essentially a small standpipe larger than the drain house from the pump to create a sysphon break. Keep it simple. A condensate pump with a hose to your slop sink. Done and simple.
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Old 08-21-2015, 07:53 AM   #8
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I think you guys have help me make up my mind. My main worry is when a pump fails and if I don't notice it, then I will get water in the basement

The condensation pump I installed for the AC and the replaced a pvc pipe that drained into the floating slab. I am wondering If I should put it on some type of buck that has a drain hole to the floating slab, that way if there is a problem it will drain into the floating slab and not all over the basement floor.
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Old 08-21-2015, 08:41 AM   #9
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Many condensate pumps have alarm contacts, wire a relay to cut off the AC to the dehumidifier if the pump fails.
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Old 08-21-2015, 08:51 AM   #10
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To compensate for a dead pump, put an alarm device next to the pump. I'm sure you can now find ones that send a message to your phone. You can also just go for the local alarm that rings.
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