[neiljoust]

Hi guys i have a digital controller when i looked at the calibration it was on 80 , i dont understand is more high the numbers more pressure in your hose sorry if sounding about thick but really no clue

[Lee GLS]

Higher means more pressure in the hose, but has no affect on the flow. The higher it is the longer it takes for the pump to turn off when you stop the flow. Have you done an auto CAL?

[neiljoust]

No mate how do you do that

[Don Kee]

Mines on 30 at the moment, i'd say 80 is a but too high if honest, you'll be putting your connections under a lot of strain!!!(do you get leaks?)
pull out your hose in hose reel and extend your pole out fully with the flow on.
Get to you cal setting and hold it all the way down until you see aut.
Press enter and let it do its thing.
It will settle on a number, press enter, and thats the cal your controller thinks you should have

[neiljoust]

ok mate thank you will do that

[neiljoust]

yes the heater started leaking and now if leave the tap off and turn on theres no leaks cause no pressure

[Lee GLS]

yes the heater started leaking and now if leave the tap off and turn on theres no leaks cause no pressure

If you are using a heater the cal will vary as the hoses get softer. Set the cal when the water is cold the see how it behaves when the hoses are hot. I can't remember what way I set mine up, but if it's too low when the hoses are hot the DE will keep cutting in whilst you are working without turning the flow off

[neiljoust]

ok thank you just set it at 30 and looks like its working fine

[WGB]

Had to set mine at around 60 when i bought my system anything less and it was dead ending.

[Ian Sheppard]

Hi guys i have a digital controller when i looked at the calibration it was on 80 , i dont understand is more high the numbers more pressure in your hose sorry if sounding about thick but really no clue

This video shows how to run the Auto cal. http://www.youtube.com/watch?v=9kKoskb7l7c&list=UL

Lee is right the higher the cal figure the longer it takes the control to DE the pump when flow stops. The controller does not set the system pressure. Pressure in your system is created mainly by the pump, hose line and water jets. Hose wall expansion will play a part also. Sometime high pressure can be created by a blocked pump filter or dirt in the jets, Twisted or kinked hose will also increase the pressure.

The below is an from an article on systems and efficient flow

The units are very flexible as to the range of pumps, hose and micro bore they will work with. The pump pressures up the system in order to establish a flow. The controller need to know what this pressure is. The amount of pressure required will in part depend on how fast the flow is or how far the pole is extended.

So why calibrate the controller to a pump?

What we are doing is telling the control what the maximum pressure the system normally operates at. To get a good flow at the brush head the system is probably running between 40 - 70 PSI. So the control knows that the normal max level is 70 PSI. When a user stops the water flow the pump will attempt to push against the restriction increasing the pressure above 70 PSI the pump sees this sudden rise and stops the pump. This is what we refer to as DEAD END (DE).

During this DE (flow stopped period) the controller periodically retests the pressure at the pump. When the restriction is removed the pressure falls back below the 70PSI maximum and the controller restarts the pump at the preset flow. Hence the need with a two pole one control system to set the calibration to the longest pole which requires the greater pressure.

The control is designed to stop the pump before the pump pressure switch activates where the water flow has been stopped. A pump pressure switch may activate at 110PSI give or take (based on 100 PSI pump) as described earlier running the pump to these high levels can cause problems.

Full article: http://www.springltd.co/node/130