Furnace Drain Tube

Problems related to residential installations.

Furnace Drain Tube

Postby damon8albarn » Sat Feb 12, 2011 7:19 pm

Just crawled under the cottage to change the furnace filter and I noticed that the drain tube seemed to be kinked. Is there a functional reason for the drain tube to be curled like that... other than to prevent the tube from hitting the sand??? I retaped the tube to give it more slack in the curled portion to hopefully prevent any further kinking.

Also noticed a large amount of ice below the exhaust pipe outside. Is this due to the furnace not draining properly?

I'm obviously a novice. Any help would be appreciated.

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- Furnace Drain Tube

Postby 4ftBanger » Sat Feb 19, 2011 9:18 am

There isn't any good reason for drain tubing to be kinked. It should be unrestricted to allow free draining of condensate water.

The ice outside is probably normal. The flue gas in a condensing furnace is relatively low temperature and carries a lot of moisture. This appears kind of like steam at the outlet. This water vapor condenses and freezes pretty quickly when its cold enough outside and usually doesn't cause any problems unless the ice build-up restricts the outlet pipe (or the nearby inlet pipe if you have one)
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