Coast Resorts Open Roads Forum: Tech Issues: Proper Accumulator Tank Pressure
Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Tech Issues

Open Roads Forum  >  Tech Issues

 > Proper Accumulator Tank Pressure

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next
egarant

Mission Viejo CA

Senior Member

Joined: 12/01/2003

View Profile



Good Sam RV Club Member

Offline
Posted: 10/10/22 10:53am Link  |  Quote  |  Print  |  Notify Moderator

Hi,

I have a Shurflo 4008-101-E65 that shows a shut off at 55 psi and a restart at 40 psi.

I have a Shurflo 182 accumulator tank, that if I am correct, should be set at 40 psi. That seems rather hight to me, I believe it is shipped with 20 psi.

I've had them in the past but never paid attention to the proper psi, I just installed them as they came.

Can anyone clarify this?

Thanks,
Eric


2021 FORD F350 dually 4x4 with 4.30 gears
2013 Eagle Cap 950
480 Watts Solar, 3K VictronConnect Multiplus II, VictronConnect smart DC-DC charger, VictronConnect 100/30 solar controller, 250 amps of lithium batteries by LifeBlue

shastagary

minnesota

Senior Member

Joined: 07/16/2007

View Profile


Offline
Posted: 10/10/22 11:25am Link  |  Quote  |  Print  |  Notify Moderator

ACCUMULATOR TANK: Model 182
INSTALLATION MANUAL


egarant

Mission Viejo CA

Senior Member

Joined: 12/01/2003

View Profile



Good Sam RV Club Member

Offline
Posted: 10/10/22 12:47pm Link  |  Quote  |  Print  |  Notify Moderator




Thanks, but I do have those manuals, I'm interested in what the proper set pressure...

Gdetrailer

PA

Senior Member

Joined: 01/05/2007

View Profile



Posted: 10/10/22 01:22pm Link  |  Quote  |  Print  |  Notify Moderator

egarant wrote:




Thanks, but I do have those manuals, I'm interested in what the proper set pressure...


Egads man, don't be so lazy, read the manual!

From the manual that was linked above (took me a whole 2 seconds to find the info)..

"RV/MARINE APPLICATIONS WITH PRESSURE SWITCH-CONTROLLED PUMPS
The accumulator contributes to longer pump life, less noise, less amperage draw, and reduced water pulsation.

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 [3 bar] pump will turn on around 30 psi [2.07 bar]. Therefore, the pre-charge should also be 30 psi [2.07 bar]. 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. [60-120 ml]. If accumulator tank pre-charge exceeds pump turn on pressure, the liquid volume is reduced."


Simply put, find the TURN ON pressure of YOUR pump, set accumulator pressure to the TURN ON pressure of YOUR PUMP.

Is that clear enough?

egarant

Mission Viejo CA

Senior Member

Joined: 12/01/2003

View Profile



Good Sam RV Club Member

Offline
Posted: 10/10/22 02:24pm Link  |  Quote  |  Print  |  Notify Moderator

Gdetrailer wrote:

egarant wrote:




Thanks, but I do have those manuals, I'm interested in what the proper set pressure...


Egads man, don't be so lazy, read the manual!

From the manual that was linked above (took me a whole 2 seconds to find the info)..

"RV/MARINE APPLICATIONS WITH PRESSURE SWITCH-CONTROLLED PUMPS
The accumulator contributes to longer pump life, less noise, less amperage draw, and reduced water pulsation.

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 [3 bar] pump will turn on around 30 psi [2.07 bar]. Therefore, the pre-charge should also be 30 psi [2.07 bar]. 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. [60-120 ml]. If accumulator tank pre-charge exceeds pump turn on pressure, the liquid volume is reduced."


Simply put, find the TURN ON pressure of YOUR pump, set accumulator pressure to the TURN ON pressure of YOUR PUMP.

Is that clear enough?


I read the manual, I even quoted the one part of the manual that I had a question on....is the RESTART pressure the same as the Turn on Pressure?

That's all.....

opnspaces

San Diego Ca

Senior Member

Joined: 12/22/2004

View Profile


Offline
Posted: 10/10/22 03:44pm Link  |  Quote  |  Print  |  Notify Moderator

Yes turn on pressure and restart pressure and accumulator pressure (aka pre-charge) should all match.


2001 Suburban 4x4. 6.0L, 4.10 3/4 ton
2005 Jayco Jay Flight 27BH
1986 Coleman Columbia Popup.

egarant

Mission Viejo CA

Senior Member

Joined: 12/01/2003

View Profile



Good Sam RV Club Member

Offline
Posted: 10/10/22 04:31pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks so much!

Mr. E

ScottG

Bothell Wa.

Senior Member

Joined: 02/25/2005

View Profile



Posted: 10/10/22 08:00pm Link  |  Quote  |  Print  |  Notify Moderator

Mr. E, please let us know how this works out for you. I have the same pump and have been considering adding an accumulator to smooth out flow but not sure how it will work with these bypass pumps. (Manufacturer just says "not needed").

C Schomer

Pueblo West, Co.

Senior Member

Joined: 12/26/2000

View Profile


Offline
Posted: 10/10/22 09:30pm Link  |  Quote  |  Print  |  Notify Moderator

I was taught to run the bladder pressure at two psi below the pump cut in pressure and that always worked great for me. The reason is, so there will be a little bit of leeway so the bladder will still have some cushion affect just before the pump comes on. I always use the same gauge to check the pump cut in pressure and to pressurize the bladder.
Running the bladder pressure exactly the same as the pump cut in pressure would give the max drawdown but I never tried to get that precise … flip a coin. Craig

* This post was edited 10/10/22 11:25pm by C Schomer *

Dutch_12078

Winters south, summers north

Senior Member

Joined: 10/07/2008

View Profile



Good Sam RV Club Member

Offline
Posted: 10/11/22 07:13am Link  |  Quote  |  Print  |  Notify Moderator

ScottG wrote:

Mr. E, please let us know how this works out for you. I have the same pump and have been considering adding an accumulator to smooth out flow but not sure how it will work with these bypass pumps. (Manufacturer just says "not needed").


The accumulator will work ok with a bypass pump. The manufacturer is correct that it's not needed for the low flow pump cycling that occurs with non-bypass pumps, but it still works well for cutting down on how often the pump runs. I have a 2-gallon accumulator installed with a SHURflo Revolution bypass pump, and we can often make it through the night with typical old folks bathroom visits without the pump running at all.


Dutch
2001 GBM Landau 34' Class A
F53 chassis, Triton V10, TST TPMS
Bigfoot Automatic Leveling System
2011 Toyota RAV4 4WD/Remco pump
ReadyBrute Elite tow bar/Blue Ox baseplate


Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next

Open Roads Forum  >  Tech Issues

 > Proper Accumulator Tank Pressure
Search:   Advanced Search

Search only in Tech Issues


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2023 CWI, Inc. © 2023 Good Sam Enterprises, LLC. All Rights Reserved.