egarant
Mission Viejo CA
Senior Member
Joined: 12/01/2003
View Profile
Good Sam RV Club Member
 Offline
|
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, 2K Watt Xantrex Inverter, Reonogy MPPT Charge Controller, 250 amps of lithium batteries by LifeBlue
|
shastagary
minnesota
Senior Member
Joined: 07/16/2007
View Profile
Offline
|
ACCUMULATOR TANK: Model 182
INSTALLATION MANUAL
|
egarant
Mission Viejo CA
Senior Member
Joined: 12/01/2003
View Profile
Good Sam RV Club Member
Offline
|
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
|
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
|
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
|
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
|
Thanks so much!
Mr. E
|
ScottG
Bothell Wa.
Senior Member
Joined: 02/25/2005
View Profile
|
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
|
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
|
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
|
|
|
