Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-29-2011, 04:51 PM   #1
Newbie
 
Join Date: Jan 2011
Posts: 22
Rewards Points: 0
Share |
Exclamation

Water in furnace duct. No identifiable source.


I am usually pretty good at figuring this stuff out but this one has me stumped.

I have a forced air natural gas furnace, maybe 12 years old. Last week I changed the furnace filter and for the noticed for the first time that water was pooling in the filter tray. Air goes horizintally through the filter and then the blower shoots it straight up vertically about 7' where the duct then splits at right angles. It is like a big "T".

The previous owner had installed a hard-plumbed humidifying unit just above the exchanger (exchanger being the thing that looks like a car radiator; I would assume this is for the a/c but not sure if that is the heat exchanger as well), about two feet above the blower. So I think I have an easy fix with a leaky valve on the humidifier. I removed the unit completely, covered and sealed the small hole with duct tape, and left the humidifier in a bucket hooked up to the water line but turned off, assuming I would see a slow drip and be able to close the books on the source of the water.

No such luck. A week later the bucket with the humidifier is bone dry and water is still dripping from the top of the "window frame" made of sheet metal that joins the air filter chamber to where the blower motor resides. So I follow it upward. There is indeed evidence of water going all the way up to the top where it tees off, and it is only on one side of the top of the T. There are no water lines, drains, or anything I can decipher as being even remotely a source of water right there. Dry on top of the vent, floor above that is dry. I am baffled. I am in Minnesota so this thing cycles a lot and so I can only assume this is condensation from the heated air on the inside of the duct (but I can see light corrosion and water deposits on the outside of the duct?!?!?) and I have no idea what else to look for. Could the intake/exhaust for the burner have any bearing on this type of situation? They seem to be unobstructed and I thought the combustion stuff was completely separate from the ductwork.

What else could this be from? It is eating my metal!

Help!

robsmale is offline   Reply With Quote
Old 01-30-2011, 04:18 AM   #2
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 25,061
Rewards Points: 12
Default

Water in furnace duct. No identifiable source.


Is the combustion air intake PVC, or metal duct.

beenthere is online now   Reply With Quote
Old 01-30-2011, 10:12 AM   #3
Newbie
 
Join Date: Jan 2011
Posts: 22
Rewards Points: 0
Default

Water in furnace duct. No identifiable source.


It is PVC and appears to be newer than the furnace.
robsmale is offline   Reply With Quote
Old 01-30-2011, 12:49 PM   #4
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 25,061
Rewards Points: 12
Default

Water in furnace duct. No identifiable source.


Post a pic of the duct that is getting wet, and of the furnace.
beenthere is online now   Reply With Quote
Old 01-30-2011, 02:41 PM   #5
Newbie
 
Join Date: Jan 2011
Posts: 22
Rewards Points: 0
Default

Water in furnace duct. No identifiable source.


robsmale is offline   Reply With Quote
Old 01-30-2011, 02:43 PM   #6
Newbie
 
Join Date: Jan 2011
Posts: 22
Rewards Points: 0
Default

Water in furnace duct. No identifiable source.


robsmale is offline   Reply With Quote
Old 01-30-2011, 02:47 PM   #7
Newbie
 
Join Date: Jan 2011
Posts: 22
Rewards Points: 0
Default

Water in furnace duct. No identifiable source.


robsmale is offline   Reply With Quote
Old 01-30-2011, 02:48 PM   #8
Newbie
 
Join Date: Jan 2011
Posts: 22
Rewards Points: 0
Default

Water in furnace duct. No identifiable source.


robsmale is offline   Reply With Quote
Old 01-30-2011, 02:49 PM   #9
Newbie
 
Join Date: Jan 2011
Posts: 22
Rewards Points: 0
Default

Water in furnace duct. No identifiable source.


robsmale is offline   Reply With Quote
Old 01-30-2011, 02:51 PM   #10
Newbie
 
Join Date: Jan 2011
Posts: 22
Rewards Points: 0
Default

Water in furnace duct. No identifiable source.


robsmale is offline   Reply With Quote
Old 01-30-2011, 02:55 PM   #11
Newbie
 
Join Date: Jan 2011
Posts: 22
Rewards Points: 0
Default

Water in furnace duct. No identifiable source.


Amazing how much worse a situation reveals itself to be once worklights and camera flashes are on the scene instead of just a flashlight. Carrier Weathermaker 58SX-060-CC-1, circa 1982. I guess I need to replace this stuff, but I don't have the $ right now for a new system. If I can just verify that the heat exchanger isn't corroded or cracked (where is it?) and address some of the water, I will have to live with it. Good thing I have a quality CO2 detector in the furnace room!

Last edited by robsmale; 01-31-2011 at 01:42 AM. Reason: additional model info
robsmale is offline   Reply With Quote
Old 01-30-2011, 03:19 PM   #12
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 25,061
Rewards Points: 12
Default

Water in furnace duct. No identifiable source.


I would open up the cover you put on where the humidifier was, and check for moisture while the furnace runs. can't tell where it is coming from. But if the floor above is dry, could be that there is still moisture laying in the blower compartment being thrown up into the duct.

The heat exchanger is inside the furnace panels, lots to remove to see it.
beenthere is online now   Reply With Quote
Old 01-30-2011, 10:45 PM   #13
Newbie
 
Join Date: Jan 2011
Location: northern va dc area
Posts: 9
Rewards Points: 0
Default

Water in furnace duct. No identifiable source.


Quote:
Originally Posted by robsmale View Post
Amazing how much worse a situation reveals itself to be once worklights and camera flashes are on the scene instead of just a flashlight. Carrier Weathermaker SX, circa 1982. I guess I need to replace this stuff, but I don't have the $ right now for a new system. If I can just verify that the heat exchanger isn't corroded or cracked (where is it?) and address some of the water, I will have to live with it. Good thing I have a quality CO2 detector in the furnace room!
great visual input ty and well done ,when a heat exchanger is cracked or leaking ,it will be identified by this,while the burners are lighting,and while they are warming up,you might hear cracking and popping,secondly you might see burner flames being blown around ,which you should not see....thirdly......nice pics ty
DELTA.T4935 is offline   Reply With Quote
Old 01-30-2011, 11:27 PM   #14
AKA HVACTECHFW
 
Join Date: Nov 2010
Location: NE Indiana
Posts: 2,318
Rewards Points: 0
Blog Entries: 1
Default

Water in furnace duct. No identifiable source.


co alarm needs to be in a location that it will wake you in the middle of the night such as your bedroom or hallway. Have a pro check the heat exchanger. if you do it, remove blower and look up. most likely the secondary heat exchanger has failed in your furnace. there is a bulletin for this problem and you need to have a contractor identify and give you your options.
__________________
IT IS WHAT IT IS
hvactech126 is offline   Reply With Quote
Old 01-31-2011, 01:13 AM   #15
Newbie
 
Join Date: Jan 2011
Posts: 22
Rewards Points: 0
Default

Water in furnace duct. No identifiable source.


Quote:
Originally Posted by DELTA.T4935 View Post
great visual input ty and well done ,when a heat exchanger is cracked or leaking ,it will be identified by this,while the burners are lighting,and while they are warming up,you might hear cracking and popping,secondly you might see burner flames being blown around ,which you should not see....thirdly......nice pics ty

I'll listen while I am peering through the window. Thanks for the tip.


Last edited by robsmale; 01-31-2011 at 01:43 AM. Reason: bad form
robsmale is offline   Reply With Quote
Reply

Tags
water in the furnace


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Grossly insufficient water supply to toilet wasting water? mysterylectric Plumbing 8 01-17-2012 11:19 AM
Solar hot water indatom123 Green Home Improvement 0 12-19-2010 12:01 AM
water borehole question joeuser General DIY Discussions 2 04-18-2010 10:33 PM
Furnace troubles, where's the water coming from... Head Scratcher HVAC 10 03-23-2008 07:40 PM
Replace furnace, coil and duct system sps123 HVAC 2 01-07-2006 10:56 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.