[Dr Heat]

I was on a call today, 10 year old Train 90% builder model. The draft fan was leaking water. The original complaint was noisy fan. Here is the thing that caught my attention, the customer had two furnaces both leaked watter out of the venter motor. Any experiance with this is this a common problem with trains.

 

[naptown CR]

I have never seen a train leak out of the fan.
the toilets usually just dump on the tracks though.

 

[beenthere]

Could it be from an improper vent system.

 

[NickTech]

choo-choo!!

 

[WarnerConstInc.]

Train??

 

[Dr Heat]

Could it be from an improper vent system.

Well it is a 2" vent one pipe (plenty of intake air) about 20' long horizontal. 6' vertical. the horizontal is pitched toward the furnace.

The drain at the bottom is open.

Thanks Been for the serious response.

 

[beenthere]

A small detail sometimes overlooked. is that when a condensing furnace designed for 2 pipe installation. Is installed as a single pipe system, and has a short exhaust. It can actually be pulling in too much combustion air.
And cause the flue gasses to be too cool, and have excess condensation.
Need a combustion analyzer to tell if it is the problem most of the time.

A CA would tell you how much excess air the furnace has. And you could restrict the intake until you had the O2 down to an acceptable level.

Also, check temp rise across the heat exchanger. Could be too low.

 

[MechAcc]

Check the transitional duct between the secondary HX collector box and the inducer. They crack and leak. You'll have to remove the inducer to get access to the duct.

Check out the Trane furnace bulletin located at
http://docs.google.com/gview?a=v&q=...&sig=AFQjCNHj7nG6lpmxeiO3phWSJ79WpWqs4w&pli=1

 

[hf05]

Would agree..secondary is cracked.yank ventor and check it out.Seen 3 within last week..