[SPE]

what does the little grub screw on the top of the pressure switch do ? (looks like its adjustable with a small allen key)
asking because I run an anologue flow controller and when its turned down to a low flow and I stop flow at the pole the pressure switch does not shut the pump down.
Half speed on the dial or higher and it works as it should 
is there some adjustability built into this pump to overcome this problem ?
thanks
Simon

[Ian Sheppard]

The screw I believe will allow you to adjust the pressure switch setting on the pump.
However as you have a controller the pump should be stopped by the controller dead ending the pump. the control should stop the pump before the pressure switch. It also sounds like you system is running on low pressure which is a good thing. High pressure in a system leads to a number of problems

I feel you would be better trying to reduce the calibration setting slightly, the ideal is to have the calibration as low as possible
This video may helpchttp://www.youtube.com/watch?v=U_6dPgfBjSI

When you turn off your pole tap the pump will continue to try pump against the restriction, as this happens pressure builds up, It is this pressure build up the control uses to DE the pump.
How long it will take the control to DE the pump will vary system to system.

The higher the calibration setting the longer it takes for the control to DE the pump. When you turn the flow rate down it will also effect the time it takes to DE the pump as it takes longer for sufficient pressure to build up in the line.
I would suggest that when you have a low flow rate that you also turn the calibration down a little. Reducing the calibration will mean the pump DE quicker.

Also have a look at the following article (point 3 ) covers calibration http://www.springltd.co/node/130

[SPE]

Thank you for your reply Ian, however, I am using one of your original mk1 eco flow analogue controllers (from the days of crow electro) with no calibration feature. I reverted back to this as I did not like the digital one and much prefer its simplicity albeit limited features.
 Back to the grub screw on the pump, can adjusting this actually increase the sensitivity of the pressure switch to turn the pump off when the controller is set to a lower flow ( 40% or lower) ? at present I have only left the pump running with the pole hose switched off for 2-3 minutes but the pressure switch showed no sign of kicking in and stopping the pump 
Simon

[SPE]

sorted !
unscrew anti clockwise  !
had to do it quite a few turns but the pressure switch is now detecting a full range of flow settings from about 20 -100%

[Ian Sheppard]

Thank you for your reply Ian, however, I am using one of your original mk1 eco flow analogue controllers (from the days of crow electro) with no calibration feature. I reverted back to this as I did not like the digital one and much prefer its simplicity albeit limited features.
 Back to the grub screw on the pump, can adjusting this actually increase the sensitivity of the pressure switch to turn the pump off when the controller is set to a lower flow ( 40% or lower) ? at present I have only left the pump running with the pole hose switched off for 2-3 minutes but the pressure switch showed no sign of kicking in and stopping the pump 
Simon

Fair play to have a V1 controller still going strong these are 7 + years old and as you say did not feature Calibration or many of the features added over the years.

Glad you have the system running as you want it