Air eliminator location

TdiGuy · 4:27PM

I am considering re-arranging the plumbing a bit in my setup. Every year in the fall or winter when i start using my heating system i need to purge the lines of air. Not a huge problem obviously but a bit of a pain since there is no drain in the basement near the boiler. The current configuration goes boiler supply —> circulator —> air eliminator —>zones—>return—> zone valves.

I am thinking of replumbing it and switching out the air eliminator to a spirovent air eliminator so the configuration would be boiler supply —> spirovent —> circulator (etc ).

I feel like the biggest issue is going to be supporting the circulator in the new location but i found threaded rod and floor supports that i think will do the job.

The big question to me, will this configuration make a differance? I keep hearing about "pumping away" and that a air eliminator should be close to the boiler yet before circulators and or pumps.

GGross · 4:39PM

draw your proposed system. The best way to keep air eliminated permanently is to get rid of your leaks. air doesn't naturally form in the system, it gets in there from filling. On install the system is purged of air, then an inline air separator helps to remove the entrained air in the system, air vents appropriately located remove the trapped air that can be missed via purging. If air returns to the system it either was never fully removed, or has been introduced via makeup water (ie leaks)

hot_rod · 6:55PM

Any air purger works best when you are pumping away from the expansion tank. The graphic below shows how the pump adds the pressure differential to the system, when pumping away

So boiler, air sep, expansion tank, pump.

Typically the expansion tank connects under the air purger. The fill system connects at the expansion tank also.

Air eliminator location

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