Clooged Air Vent causing water leak over the expansion tank

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Old 11-30-08, 04:40 PM
J
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Question Clooged Air Vent causing water leak over the expansion tank

Hello,
I have a faulty air vent that is causing water leak over the expansion tank on a Weil Mclain V68 boiler. There is also a second air vent clogged (not leaking) just above the coil connected to a dead end pipe (approx 4" long) that I would say need to be replaced. I'm not sure about the procedure Should I drain all water or just enough to lower the pressure to a certain range when changing the air vents. Please advise.
 
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Old 11-30-08, 08:32 PM
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You shouldn't need to drain ALL of the water ... TURN POWER OFF to the boiler, close the manual water feed valve, drain the boiler pressure to zero ... look for any valves that you can close to isolate any parts of the system ... the less you drain, and the less fresh water you put in, the better.

Water is still going to come out, even with the boiler pressure at zero.

Have the new part ready to go on ... cover anything that shouldn't get wet with plastic sheets... disposable diapers make great mops ... if you work quick, you can probably do the change with minimum fuss ... just think it out before you start ...

Make note of any valves you've closed and re-open them when done ... turn on water, let boiler pressurize, restore power, check for leaks ...
 
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Old 12-01-08, 06:54 PM
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NJ Trooper,
Thank you for your detailed response. I will try it out.
 
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