cup-thing on the side of furnace and pipes going into it

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qmqmqm

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Hi there.

What is the cup-thing on the side of the furnace? It is full of water and overflows into a drain pipe.

I think the flexible black pipe is from the AC. It drips water. Should it be placed into the cup as shown in the photo?

What are the 2 white rigid pipes above the cup (not the drain pipe)?

IMG_20210609_002536.jpg

Thanks so much!

Paul
 

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billshack

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yes it is a condensate drain , It needs back pressure to work.
 

billshack

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Why back pressure?
because the air inside the duct work is under pressure (2-5 inches presure ) so if it is a regular trap the pressure would push the water out of the way and therfore leak air out . I remember back in the day i wiuld make traps of 11 inches in dept to avoid this .
 
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