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Old 04-27-2014, 11:28 PM   #11
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Yes, it's a pressurized tank that installs in-line with the pump. no power, only pressure. PSI can be changed through a bicycle (Schrader) valve located on the accumulator body. I installed one on my previous pop-up and they really work nice. Quieter system, less pump cycling, and smoother flow to the faucets. Again, this is when you are using your water tank and don't have a city hook-up.
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Old 04-27-2014, 11:38 PM   #12
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Originally Posted by Jmooney View Post
Just sits in line with the pump?

powered, or just uses water pressure from the pump?
No the concept is simple. Accumulators have a rubber bladder that has an air charge on the other side that is set to the pump turn on pressure this means that the accumulator fills up with water on the water side which raises the pressure on the air side by reducing the volume that the air has to occupy. Air will compress but water will not. The benefit of an accumulator is you use the air pressure to run the coach water supply and the pump to keep pressure up in the accumulator. The same principle is at work by water towers. Pumps are used to fill the water tower but the pressure comes from the elevation of the tower. The larger the accumulator the smoother the water pressure in the coach. In my old TT I had a small accumulator installed however in my MH I have a 2 gallon large accumulator installed. It does make a huge difference.
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Old 04-28-2014, 06:12 AM   #13
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Accumulators are often used on industrial hydraulic systems where there is a high flow demand for a short period of time that exceeds the maximum GPM output of the pump. The first application that comes to mind is a die casting machine where the shot cylinder needs a lot of flow in order to move very quickly to shoot the metal into the die. The die open/close function doesn't need to be as fast so the pump flow can run it without the accumulator being in the circuit. The pump recharges the accumulator constantly.

Bladder accumulators are also used on home well water systems and operate on the same exact principle as an accumulator in an RV. Your well pump wouldn't last very long if it started every time you cracked a faucet.

I bought a small 1 gallon accumulator on line from Sears for around $20 and simply cut a tee into the cold water line under the bathroom vanity and suspended it from the underside of the vanity shelf...works great and the pump rarely cycles.
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Old 04-28-2014, 07:14 AM   #14
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Ok, for those of us that don't know, what is a accumulator, and why do I want one?
AKA expansion tank. But must be an FDA approved bladder if you do residential. I have a 2 gallon for my unit.
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Old 04-28-2014, 07:21 AM   #15
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Originally Posted by Jmooney View Post
Just sits in line with the pump?

powered, or just uses water pressure from the pump?
Air on one side and then the pump/water pressurizes the other side.
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Old 04-28-2014, 07:24 PM   #16
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We'll solved the problem. The inline filter cap was not tight and sucking in air. I also reduced the accumulator pressure to 30 PSI. Much better. Thanks for all your help.
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