How do you actually know if there is air in your pipes?

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Old 02-01-19, 06:38 PM
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How do you actually know if there is air in your pipes?

A guess a big pocket a might cause a section of baseboard to not get hot but what if there is some air but not enough to stop the flow?
 

Last edited by m3ath3ad; 02-01-19 at 07:34 PM.
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Old 02-01-19, 07:25 PM
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Most people know because they can hear the water gurgling in the pipes.
Others know when a particular zone doesn't work because it's airbound.

A little air won't hurt anything and eventually should work its way out of the system.
 
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Old 02-01-19, 07:46 PM
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It just seems like if everything else is working, some tech repair guys just say there is air in the system. I got quoted $800 to purge and change the expansion tank. I declined obviously and did it myself. I changed out the expansion tank but it wasn't water logged and still has 12psi when I pulled it out of the sytem. It was during this crazy polar vortex, so it felt better doing anything even though it might just be my old house is too drafty to handle -40
 
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Old 02-02-19, 04:17 AM
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Can you give a description of the problem you are having and the type of system you have?
 
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Old 02-02-19, 10:15 AM
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it might just be my old house is too drafty to handle -40
Yes..... that is a problem. The extreme cold can tax many heating systems that weren't designed to deliver enough heat to counteract temps that low. You need to look into stopping the drafts.
 
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Old 02-02-19, 10:21 AM
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If you have some air in your system you may hear a little water movement like rushing water or maybe some pinging. If system is air free you shouldn't hear anything. Depending on your system design, enough air could stop water circulation and must be purged. Air of any significance will not work its way out of a closed system by itself.
 
 

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