[mufcglen]

decided to fit an almost new shurflo 100psi pump i had laying about as the old one was working fine but was getting old, i recalibrated the controller doing the 30 cal mode and got c24, i had pole fully extended and tap open while doing this but today its been abit funny basically i usually run at 30 on the controller but it was dribbling out untill i put the flow up to 38-40 all good for the job then pack up in the van onto the next job and turn tap on in the line and it takes time to build pressure again then after a minute all good, also noticed the old pump used to pretty much stop and go to DE within seconds of turning inline tap off whereas this thing keeps going for a minute or so then cuts out?
any ideas guys, do i need to mess with my calibration settings and what happens if i adjust the cal myself higher or lower?

[Ian Sheppard]

The New pump will have a different output characteristic compared to the old pump. It will also be more efficient or at least you would hope it would. This may explain the lower calibration figure. The slow flow initially could be air in the system somewhere. You may want to run the pump for a few minutes then re run calibration.

A lower cal figure should mean the control dead ends the pump quicker, however air may interfere with this.

Increasing the calibration figure would make the control less sensitive so taking longer to stop the pump. As above the lower the figure the quicker the pump should stop.

[mufcglen]

Cheers Ian, great advice I had the whole system apart as I painted the van this weekend so wondered if there's still abit if air in the system somewhere although I have put about 200 litres of water through already?
I might lower the cal to see if the pump dead ends quicker

[mufcglen]

hi Ian today i got out working while the weather was ok and kept messing around with the controller, firstly i did the auto cal and it gave me 24 so i worked with this at flow rate of 30 but found what is happening is the controller seems to stay de for a good few minutes untill the flow slows to almost a dribble then the pump kicks in and the flow begins to build untill its at the normal rate, then i finish the job turn to inline tap off, pack away and when i put all the hose away its still pumping away for a few minutes untill it dead ends and pump cuts out as it should.
go to next job and turn tap on and the flow is immense for a minute and evententually dies down again to a dribble and rebuilds up so i messed with cal setting myself and put it up to 35 and found the pump goes to de mode quick quickly but still has this flow issue when turning back on, its like its stuck in de mode as the controller doesnt seem to kick back in to allow the pump to start working untill the pressure has come right down.
there surely cant be any air in the system still after using 400 litres of water?
there didnt seem to be any issues with the controller with the old pump so thinking about stripping nw pump down and checking the pressure switch or something?

[Tom White]

 

[Ian Sheppard]

hi Ian today i got out working while the weather was ok and kept messing around with the controller, firstly i did the auto cal and it gave me 24 so i worked with this at flow rate of 30 but found what is happening is the controller seems to stay de for a good few minutes untill the flow slows to almost a dribble then the pump kicks in and the flow begins to build untill its at the normal rate, then i finish the job turn to inline tap off, pack away and when i put all the hose away its still pumping away for a few minutes untill it dead ends and pump cuts out as it should.
go to next job and turn tap on and the flow is immense for a minute and evententually dies down again to a dribble and rebuilds up so i messed with cal setting myself and put it up to 35 and found the pump goes to de mode quick quickly but still has this flow issue when turning back on, its like its stuck in de mode as the controller doesnt seem to kick back in to allow the pump to start working untill the pressure has come right down.
there surely cant be any air in the system still after using 400 litres of water?
there didnt seem to be any issues with the controller with the old pump so thinking about stripping nw pump down and checking the pressure switch or something?

OK in this case as the system and controller had been fine up to changing the pump. I would suggest switching the old pump back into the system. If as In expect every thing is fine with the old pump we will have identified the problem.

I am not so sure its is the pressure switch on the new pump that is the issue. If the pump PS was a problem I would expect the control to display the PS message as in my other recent posts the control is continually carrying out electrical tests in the background.
I am thinking if the may be something with the diaphragm on the new pump.

Based on the information so far It is unlikely to be a control issue as it was fine prior to changing the pump.

[Tom White]

there didnt seem to be any issues with the controller with the old pump so thinking about stripping nw pump down and checking the pressure switch or something?

It won't be the pump's pressure switch because it'll be disconnected and your flow controller does the job of the pressure switch; or it should do.

You could completely disconnect the flow controller and reconnect the pump pressure switch back up; it's very simple to do - takes about five minutes - and test the pump without the controller at all.  If the pump works fine, it's fine.

It sounds like your flow controller needs calibrating correctly; are you sure you're doing it correctly?

[Ian Sheppard]

there didnt seem to be any issues with the controller with the old pump so thinking about stripping nw pump down and checking the pressure switch or something?

It won't be the pump's pressure switch because it'll be disconnected and your flow controller does the job of the pressure switch; or it should do.

You could completely disconnect the flow controller and reconnect the pump pressure switch back up; it's very simple to do - takes about five minutes - and test the pump without the controller at all.  If the pump works fine, it's fine.


It sounds like your flow controller needs calibrating correctly; are you sure you're doing it correctly?

With the Spring controller the pressure switch should be connected as it provides additional fail safe. The controller will operate with the pump PS disconnected but it is better left in line.
We design the control to operate with the pump pressure switch.

[mufcglen]

Hi guys yes the ps is still connected up to the pump just as the old one was, I'll keep playing about with it I'm sure I'll sort it if not ill bang old pump back on for now!

[mufcglen]

swapped the old pump back on today and all working fine again so must be a pump issue, i did notice the little allen key screw in the top of the pressure switch wasnt screwed in half as much as old pump.
does anyone know what this does on the shurflo pumps i presume its got something to do with the pressure switch and i think somewhere within the pump this is the issue as the flow isnt kicking the pump back on again untill its dribbled out then builds back up and then when turned flow tap off the pump doesnt shut down for a good minute!

[Tom White]

swapped the old pump back on today and all working fine again so must be a pump issue, i did notice the little allen key screw in the top of the pressure switch wasnt screwed in half as much as old pump.
does anyone know what this does on the shurflo pumps i presume its got something to do with the pressure switch and i think somewhere within the pump this is the issue as the flow isnt kicking the pump back on again untill its dribbled out then builds back up and then when turned flow tap off the pump doesnt shut down for a good minute!

The small screw adjusts the calibration on your pump.  Take your pump pressure switch apart, carefully, it's easy to do, and you'll see how it works.

[mufcglen]

cheers fella so if that affects shut off would it have anything to do with the pump not kicking back in again once i open the flow tap as well?

[Tom White]

cheers fella so if that affects shut off would it have anything to do with the pump not kicking back in again once i open the flow tap as well?

Yes, I think it would.