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Old 10-25-2018, 07:59 PM   #1
Join Date: Sep 2015
Location: DE
Posts: 53
Accumulator tank

About to run the pink stuff through my lines. Do I need to remove the accumulator tank?

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Old 10-25-2018, 10:53 PM   #2
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Join Date: Jul 2017
Location: North of Seattle, WA
Posts: 4,299
Not necessary. When you put in antifreeze a small amount will enter the accumulator but only a small amount as the diaphragm will compress then limit the amount. When de-winterizing just make sure to make sure the pressure in the system is run down to zero then up to regular pressure a few times and it will flush the small amount of antifreeze that might remain out.

Most accumulators have a diaphragm that is pre-pressurize to around 30 psi of air. As pressure builds when the pump runs it allows a certain amount of water to be stored under pressure. This allows faucets to be opened once or twice for small amounts of water without starting the pump. Also smooths out flow so pump doesn't "cycle" rapidly. Some pumps are "bypass pumps" and this is all handled by an internal bleed in the pump itself with special pressure controls. No need for an accumulator with them.
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