adjusting thermal expansion tank


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Old 02-23-16, 03:41 PM
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adjusting thermal expansion tank

I adjust the air pressure in my thermal expansion tank. I drained the plumbing system and then adjusted the psi.

My question is....

I believe its necessary to make adjustments when the system is under 0 pressure.

But do you have to remove the expansion tank from the system completely, completely drain it, adjust the pressure, and then put it back up?
 
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Old 02-23-16, 06:11 PM
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Just get 0 psi on the tank should be sufficient...
 
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Old 02-23-16, 06:17 PM
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depending on the orientation of the tank though, there will still be water in it.
 
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Old 02-24-16, 01:52 AM
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With a properly sized expansion tank the amount of water within it when the system pressure is zero will be irrelevant. Be sure to pressurize it to the average water pressure of the system or maybe a couple of psi over. An expansion tank pressurized to less than the system pressure is useless.
 
 

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