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Old 08-18-2010, 11:48 PM   #1
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Thumbs down Accumulator tank from Surflo

Well I installed the little accumulator tank from Surflo, and yes maybe I should have installed a larger one - like the 2 gallon ones sold at Lowes - in the US - but Lowes Canada does not seem to carry them.

In any event, it's installed and I'm struggling to see any benefits. The pump still starts as soon as I open any tap... I must not have set it up properly.

Here is how I set it up.
1. Turn off pump
2. Open one faucet, leave it open
3. Using bicycle pump, I put 40 PSI in the accumulator.
4. Turn pump on
5. Water strean is steady, close faucet.

Why will the pump still start right away.... should I not at least get 1-2 cup of water before it starts.... what am I doing wrong.

Thanks.
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Old 08-19-2010, 06:11 AM   #2
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I couldn't find the card that came with my pressure tank that describes the amount of pressure that needs to be in the tank but I found this. Hope it helps.
Check the bladder pressure tank air charge
• Disconnect electrical power to the pump.
• Drain the tank by opening the closest faucet.
• Check tank pressure by placing a tire gauge on the air-
charging valve on top of the tank.
• Add air if the pressure is more than 2 psi below the pump cut-in pressure (lowest pressure in the range). Use a tire pump or air compressor. Use caution with
an air compressor.
• Release air if the pressure is 2 psi above the pump cut-in pressure.
• Check for leaks in the air charging system. Use a soap solution to check the air charging valve for leaks.
• Re-start the pump and run through a normal cycle to verify the setting.
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Old 08-19-2010, 06:48 AM   #3
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Quote:
Originally Posted by Filthy Beast View Post
• Add air if the pressure is more than 2 psi below the pump cut-in pressure (lowest pressure in the range).
Thank you - nice to see someone who's up early too

I think that is my problem, but I am not sure how to measure the cut-in pressure from the pump and I cannot find it anywhere...

Here is what I understand, without accumulator:
1. Tap open, so pressure goes down to X PSI
2. Pump starts and pressurizes up to Z PSI
X is lower than Z.

The accumulator needs to be set to Z -2 PSI?

Thanks
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Old 08-19-2010, 06:51 AM   #4
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Quote:
Originally Posted by miatared View Post
Thank you - nice to see someone who's up early too

I think that is my problem, but I am not sure how to measure the cut-in pressure from the pump and I cannot find it anywhere...

Here is what I understand, without accumulator:
1. Tap open, so pressure goes down to X PSI
2. Pump starts and pressurizes up to Z PSI
X is lower than Z.

The accumulator needs to be set to Z -2 PSI?

Thanks

Denis
mmmm I am thinking it will be X - 2. No?
If X is when the pump starts it will be the "cut in" pressure.

I have one out in the camper waiting for an ideal opportunity to install. I will go out and get the paperwork. BRB
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Old 08-19-2010, 07:07 AM   #5
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Hum....

The tank's role is essentially to fool the pump in thinking the pressure is still high - or over X so it won't start.

Right now I have set to 40 PSI. Probably too high me thinks. But then how would I know what the cut-in or pump start PSI?
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Old 08-19-2010, 07:21 AM   #6
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Ok got the paperwork.

"The most efficient use of the accumulator occurs with the pre-charge set at the SAME pressure as the pump's pressure switch "turn on" setting. Typically, a 45 PSI pump will turn on around 30 PSI. Therefore, the pre-charge should also be 30 PSI. The pre-charge MUST be set in a "STATIC" condition (pump off and at least one water fixture opened.)

Depending on pre-charge pressure to the accumulator, in relation to the pump turn on/off pressures, stored liquid is about 2 to 4 OZ. If the accumulator tank pre-charge exceeds pump turn on pressure, the liquid volume is reduced."

2 to 4 OUNCES? WTF. Looks like this was a waste of money.
Not the first waste of money in my RV journey!

Oh and there is a NOTE that says it is not recommended for use with a 4900 or 5900 series smart sensor pump.
I will need to be checking THAT too.
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Old 08-19-2010, 07:26 AM   #7
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Quote:
Originally Posted by herk7769 View Post
Ok got the paperwork.

"The most efficient use of the accumulator occurs with the pre-charge set at the SAME pressure as the pump's pressure switch "turn on" setting. Typically, a 45 PSI pump will turn on around 30 PSI. Therefore, the pre-charge should also be 30 PSI. The pre-charge MUST be set in a "STATIC" condition (pump off and at least one water fixture opened.)

Depending on pre-charge pressure to the accumulator, in relation to the pump turn on/off pressures, stored liquid is about 2 to 4 OZ. If the accumulator tank pre-charge exceeds pump turn on pressure, the liquid volume is reduced."

2 to 4 OUNCES? WTF. Looks like this was a waste of money.
Not the first waste of money in my RV journey!
Just like Mighty Mouse, you saved the day (OK I'm dating myself...)

40 is too high for sure then. I'll try 30 and see how it pans out.

2-4 oz - what a waste, ah well, when I'm in the US I'll get that 2 gallon tank from Lowes to replace it. At 40 PSI I probably have a teaspoon of water

Thank you.
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Old 08-19-2010, 07:43 AM   #8
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Exclamation

Quote:
Originally Posted by herk7769
Ok got the paperwork.

"The most efficient use of the accumulator occurs with the pre-charge set at the SAME pressure as the pump's pressure switch "turn on" setting. Typically, a 45 PSI pump will turn on around 30 PSI. Therefore, the pre-charge should also be 30 PSI. The pre-charge MUST be set in a "STATIC" condition (pump off and at least one water fixture opened.)

Depending on pre-charge pressure to the accumulator, in relation to the pump turn on/off pressures, stored liquid is about 2 to 4 OZ. If the accumulator tank pre-charge exceeds pump turn on pressure, the liquid volume is reduced."

2 to 4 OUNCES? WTF. Looks like this was a waste of money.
Not the first waste of money in my RV journey!
I am a retired Controls Engineer. Part of my job was designing and trouble shooting hydraulic systems. Accumulators are not a cure all. They are used to eliminate dips in the fluid pressure when a new demand is added to the system. Depending on the system and application, the accumulator pressure is set from 1/2 to 3/4 of the running pressure.

I have a 1 pint accumulator in my HTT and the pressure is set at about 5/8 of the maximum pump pressure. It works great. It cuts down on the hammering of the system when the can is flushed or a faucet is turned on. It is not designed to supply enough water to the system so the pump will not turn on. It will quiet the system a certain amount.

I am pleased with the improvment that mine makes to my system. Hope this helps.
Dick
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Old 08-19-2010, 07:50 AM   #9
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Thanks Dick,

So you still think its worth installing? I was convinced I was going to have to EBay it and buy the larger unit.
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Old 08-19-2010, 08:03 AM   #10
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It will quiet the pump. If you install a bigger unit, the pump will have to keep this large unit full. The acumulators are more to take the shock out of the system than to supply water. Give the small one a try with a pressure setting that is lower than the pump running pressure. This will improve the way your pump sounds. Good luck.
Dick
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