Condensate Pump on same circuit as furnace?


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Old 10-23-22, 10:36 AM
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Condensate Pump on same circuit as furnace?

I have a Rheem R96va gas furnace and ever since upgrading to a higher efficiency furnace, there is now too much condensate for my old drain system to handle, as it occasionally backs up and heads back to the furnace (not good!). So I want to install a condensate pump (and most likely a condensate neutralizer, since some of the drain system is pretty old).

The furnace is hardwired, on it's own 15amp circuit. I imagine the ideal scenario would be to run another separate circuit for the condensate pump. But...is there any reason why I can't just pigtail off the furnace in the junction box to make an outlet for the condensate pump? Or maybe install an outlet on the furnace itself? I've seen conflicting info in regard to code, safety, etc on this. I'd love to hear your thoughts.
 
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Old 10-23-22, 10:42 AM
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my old drain system to handle, as it occasionally backs up and heads back to the furnace
That certainly isn't connected correctly.

I install a single receptacle for the pump and connected off the service switch.
 
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Old 10-23-22, 10:51 AM
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Thanks for the input. It definitely doesn't seem connected properly. The drain goes down into the crawlspace then a horizontal run of about 10-12 ft and elbows to a fitting connecting into the drain that the kitchen sink goes to. I think they got away with it because of the lower efficiency furnace having less condensate? Just a guess. I'm hoping installing a condensate pump will help? I'm also going to go down and make sure the slop on the horizontal run is right and maybe increase the slope if need be.

Another can of worms, but I failed to mention, there is no service switch. The furnace is located in a small closet like room on the main floor, easily accessible. Just straight hardwired from the wall. Should I add one?
 
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Old 10-23-22, 10:58 AM
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A condensate line is supposed to discharge into a trap so that sewer gas cannot be drawn back up into the air handler/furnace.

Yes... definitely add a service switch.
You can install a 4" box and use a combo plate.
 
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Old 10-23-22, 11:05 AM
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Awesome, again thanks.

Good to know about the trap - makes sense. I'll end up re doing all the condensate plumbing.

You think it's okay installing that 4" box./combo plate directly on the side of the furnace?
 
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Old 10-23-22, 01:59 PM
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Sure... it's common to mount a box to the furnace.
Just make a visual check that there is nothing behind it.
If you can't see behind it.... use short self drilling screws. #8 x 1/2" or 5/8" self drilling are perfect.
 
 

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