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My furnace, a high-efficiency gas model from Rheem, is about 5 years old. I recently had to replace one of the pressure switches and so I was looking around the inside of the furnace.

There is a condensate trap which is fed by two tubes, it then discharges outside of the furnace into a condensate pump (because I don't have a convenient drain in the area).

One of the tubes comes from the exhaust vent pipe of the combustion air system. I don't know the purpose of the other (smaller) one, marked "???" on this picture:

furnacepic

So, to my question: See how the "???" hose actually rises about 3/4" from the drain port before it turns downward into the trap? It's like an inverted P-trap :) Is this intentional or should I shorten that tube so that it doesn't require a certain depth of liquid before it drains? Or should I just leave it alone?

(Edit - This is a question about installation technique and not factory configuration. I have found an answer in the installation manual and will post it below. Please don't close the question!)

bitsmack
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1 Answers1

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I dug into the installation manual and the original configuration was incorrect. There are many different field conversions that can be made to the unit, some of which require repositioning the condensate trap. They all have the following in common:

Original configuration:

before

Modified configuration:

after

And the following note:

checklist

So, yes, I should shorten the tube.

bitsmack
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