DuoVent leaks after 1 year

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  #1  
Old 10-12-11, 09:47 AM
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DuoVent leaks after 1 year

My 15 year old boiler system has had several leaky air vents. The current one has been in place less than a year. It is a Watts DuoVent. It is installed on the American AirVent 443 which is just after the boiler outlet and just before the circulation pump. The system pressure is 13-15#and stays under 15# when hot. The DuoVent seems to work fine, meaning I do not hear any air in the system. When I press the manual (red cap) vent it just has water, no air. However, there is now water or water residue on the DuoVent. I flushed the system a few weeks ago and the DuoVent properly got rid of the air in the system. It is the only vent on the system. Why do you suppose it is leaking? Should I remove it and clean it?

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Old 10-12-11, 09:51 AM
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Old 10-12-11, 10:49 AM
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I would replace it. Also, you shouldn't have a cap on the schraeder valve.
 
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Old 10-12-11, 10:55 AM
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The black cap is loose. I've read to keep it on but loose to keep debris from settling on it and to keep the water that exits from shooting up. So, should a year be a normal replacement interval?
 
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Old 10-12-11, 01:50 PM
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Originally Posted by jeweler View Post
So, should a year be a normal replacement interval?
No, I think normally they should last longer. I haven't used the Watts units, but have had satisfactory service with Maid-O-Mist.
 
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Old 10-12-11, 06:09 PM
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Why did you flush the system?
 
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Old 10-13-11, 08:19 AM
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It had glycol that was 3-4 years old and severely diluted.
 
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