Water Overflow


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Old 01-17-07, 11:00 AM
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Water Overflow

Hi

My oil-fired furnace has an overflow pipe. Hot water releases whenever the furnace attempts to pump water through my pipes and baseboards. I temporarily stemmed the problem by closing a valve or two. Now the house is cold...

What can I do myself to get the settings/valves correct?

(I havent had to use heat yet this year, and now have to on East Coast)...
 
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Old 01-17-07, 11:20 AM
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Overflow pipe?

Can you follow that pipe back to a valve and tell us what it says on the valve?
 
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Old 01-17-07, 11:23 AM
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No.. It just goes into the furnace. There is a release "switch" ontop where I can make water come out in a stream. The PSI is still only at 5 - but it seems to me that water is backing up or something and is getting released there. Even when I use the other release valve (faucet looking thing) on the side, it doesnt seem to help.

I really think I screwed with the valves...and perhaps disrupted the pressure...
 
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Old 01-17-07, 11:29 AM
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It's never fun feeling lost.

Basically, most boilers work like this. They are pressurized to 15 or 20psi so that the pumps can still work properly for keeping things flowing, even when upstairs where the pressure will be lower. Because boilers heat water and water expands, they require an expansion tank and a pressure relief valve (usually located on top). The expansion tank contains air. The modern ones look a bit like a small propane tank and have a bicycle type valve on the top or bottom. The older ones look like small water heaters tucked up between the joists. If either types gets waterlogged then there is no air to absorb the expansion and the PRV will let water leak out if the pressure hits 30 psi so that your system doesn't develop crazy leaks or worse.

You might have a waterlogged tank and now have water coming out of your pressure relief valve. Can you dientify which type of expansion tank you have?
 
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Old 01-17-07, 12:19 PM
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It is grey and looks like a propane tank that might be able to hold 2 gallons of water...it is up in the rafters with some pipes going in and out....
 
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Old 01-17-07, 01:11 PM
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Any chance you could take a picture and post it somewhere and give us a link to it? Your description sounds like both styles.

Anyway, it really sounds like you'd be safest getting someone in to see it.
 
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Old 01-17-07, 01:17 PM
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...

this is it

http://www.amtrol.com/filltrol.htm


samke make, et al
 
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Old 01-17-07, 01:24 PM
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Okay... that tank might have a ruptured bladder. If you really quickly depress the valve on the bottom, does water come out?
 
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Old 01-17-07, 01:27 PM
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at the bottom of the fil-trol? then, no, no water comes out
 
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Old 01-17-07, 06:06 PM
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Shrader valve

Originally Posted by bjk925
at the bottom of the fil-trol? then, no, no water comes out
No, the tire type air valve on the bottom of the tank. Does quickly depressing it release a small amount of air or water? Don't do it for more than a split second.

Water means the tank is water logged.
 
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Old 01-17-07, 06:20 PM
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Can you close the tank off from the air separator?
 
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Old 01-19-07, 02:40 PM
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A Lot Of Times The (fil-trol) If You Have An Older Sysem You Should Replace With A 1156 Watts Valve & Then Check Your Running Presure To See If You Need A Tank If It Is An Xtrol #30 Tank They Have To Be Replaced Not Drained..mike
 
 

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