[Ian Sheppard]

Ok

I am working on the principle that you want the control to DE (flow off) or hit P (pressure) on the VS

I am also assuming that the flow is cutting of when you want it to. As I understand it the VS
will retest for (Flow off) P every few seconds, the pump will pulse. With no pump pressure switch the controller will continue to retest and in theory the pressure will continue to build. This building pressure may be what is turning the pump.

Now if the control is hitting P (flow off) sooner than you want you need to calibrate the pressure setting on the VS to be less sensitive.

[Dave Willis]

It's doing everything it should but why would the pump continue to turn in between pulses? Or why would it overpressure with the cal really low. No evidence of air anywhere in the system.
I just wondered if there was a techy kind of answer that might lay with the pump perhaps.

[Ian Sheppard]

The DE or P retest needs to have some pressure in the system to test against, Each time the controller retests and the pump pulses the pressure builds very slightly.

With a pump pressure switch the pressure will eventually trip the pressure switch and stop the pump completely.

With no pump pressure switch the pressure builds this pressure has to go somewhere so it is possible that the pressure build up will turn the pump very slightly.

In most circumstances we would advise not to leave a control in this flow off situation for long periods of time. as it can lead to damage to the pump and controller.

To be honest to the best of my Knowledge the VS is working as it is designed to. As is the pump by the sound of it.

So to answer your original question with our control because we recommend the pump pressure switch is connected so eventually with our control the pump would eventually stop the pump completely and the control would show PS or pressure switch activated.

If you think you are getting high pressure in the system it is always worth checking from the brush back to the pump and ensuring there are no restrictions EG grit dirt or kinks in the hose.

Also remember the colder weather effects the expansion of the hose and can cause higher pressure and load on the pump.
Hope this all helps

One of the differences between the VS and our control is that our unit will operate with a pump pressure switch.

[Dave Willis]

Thanks Ian. I have an on going pressure problem with my system. I've probably mentioned it before on here, where I get too much pressure. I've changed everything I can think of (three different varistreams) all the pipework and hoses. All the calibration settings, all connectors and any o rings etc. The pump is the only thing left that hasn't been changed.

[Ian Sheppard]

Just out of interest what size hose are you using. Some off the smaller micro bore does not work well with the Varistream.

[Dave Willis]

8mm

[Ian Sheppard]

Ok just a thought may be worth trying another pump.

[mark m]

I got a hydroflo from the window cleaning warehouse about 18 months ago still works a treat

[Mr. S]

I've ordered a new vs earlier, should be with me tomorrow! 
Ian - I had similar probs to above where the pump just seemed to keep turning over? It may have been faulty but i soon replaced with a vs and never had the prob again.! It did however earn me the money too, so i was happy but it only lasted a year before failing!(should have contacted supplier at time but you know how it is time is money! And i thought it might work differently to vs! :)
Never mind it will all be sorted tomorrow! BUT..................................

I've learnt another thing from Mark Ettings issues and mine........ It is a good idea to keep a spare vs and pump handy!!!!! I'll be sorting that out asap!!!!!

[AS Window Cleaning]

me and my wife run off 2 varistreams and 2 pumps. this way if one goes down, a quick hose pipe connector and can both run off 1. so always got a 'spare' handy!

[Ian Sheppard]

Thanks for the feed back on the controllers We have one or two things in the pipeline that will alter how the controller operates when in DE.

Both the VS and our control should pulse the pump every few seconds when in DE or P it may be that some pumps sound a little more noisy than others.

Also as said above be wary about water flows through cold hoses as the lack of expansion during this cold snap is likely to have and effect on how your pump and controller will work.

Take care out there

Ian