[Pole2pole74]

Hi. Could someone give me some advise please. After 4 years of great service my pump finally died. I looked on eBay and saw a 7LPM Vyair pump for sale. My last one was only 4. I was using microbore hose. At first it worked great but after a month all power went and hardly had any water pressure. So I told the company and they said the hose I was using was too small. I bought minibore hose and tried it and still same problem. They replaced pump. Again it worked for around 6 weeks and now the same problem. Any ideas as to why this is happening?

[rah]

I'm running a 10 ltr with return to tank, have been for a good while now and haven't had a problem.

Do you have a strainer inline before the pump ? I'm jut guessing that maybe your getting blocked.

Rob.

[Pole2pole74]

Didn't have a strainer before but got one for this last pump. Can you run a 10l pump with an 8mm hose? And was your pump a vyair?

[SherwoodCleaningSe]

I have 2 vyair pumps same model and the pressure switch has gone overly sensitive on one. Try running the rump with the 2 wires going to the pressure switch connected together. If the pump woks fine then you will need to replace the pressure switch or use a pump controller taking the pressure switch out of the circuit.

Simon.

[Pole2pole74]

Sorry Simon. The two wires going to the pressure switch connected together? Not sure I understand 😰

[Pole2pole74]

Also I have never used a flow controller. Would that make a difference?

[SherwoodCleaningSe]

I mean having the wires removed from the pressure switch and connected together. A couple of photos to show what i mean (says the uploader is full sorry). I found that the pressure switch was the problem on one it just caused the pump to cycle and sometimes stop completely. If the pump runs with the wires connected together then it's the pressure switch at fault, so you can test whats happening.  Of course you can't run the pump without a pressure switch unless you have an appropriate flow controller.

Simon.

[Pole2pole74]

Thanks Simon. I'll try that mate. Fingers crossed eh? If you could send photo's to my email you will be welcomed into heaven with open arms. If not thanks anyway. Pole2pole@hotmail.co.uk

[rah]

Sorry for the delay Poleman,

Yes my pump is a vyair and works fine with minibore 8mm Internal diameter. I don't use a flow controller never have, but I looking to get two fitted as the tank is going into a van for my son & a guy to work from.

10ltr even running to poles and a return is a little bit of a beast, great if you want to empty your tank quickly! hence the flow controllers going in.

Rob.

[Ian Sheppard]

A 7LPM pump from 4LPM is a lot of extra water, with no flow controller the pump is running flat out trying to force all the water down the microbore this will build the pressure very quickly and likely blow the pump pressure switch.

Either you need to think about larger bore hose to reduce the pressure and even the flow out. At 7LPM you will run through water quickly so it is worth thinking about some options a flow controller being one.

Some of the reasons a PS will go

1. In running the pump until it hits the pressure switch you are running the pump as hard as it can possibly work. This means that the pressure in the system will be at its absolute maximum. This puts strain on the hoses, on the fittings and on the pump. It therefore increases the chances of split hoses, leaking joints and increases wear on your pump, shortening its life.

2. As the pressure switch cuts out the pump is at maximum, working as hard as it possibly can and therefore drawing maximum current from the battery. Hence as the switch opens it is under great strain. The high current and the fact that the pump is an inductive load (with stored energy) means that the pressure switch contacts are likely to arc and eventually they will fail.

With a controller with dead end detection properly calibrated, the pump will be stopped a long time before this high pressure and high pump load is reached. This means that because the pump is turned off earlier you are saving battery energy, thus increasing both the battery life and the amount of time you can work on a battery charge.

Another option is a tap or trigger just be aware both these rely on the pressure switch to stop the water flow. There are plenty of people using all of the above methods who Im sure will pass some good advice

[Pole2pole74]

Thanks for the advise guys. Was going to get a flow controller but I use a trigger on my pole which I like. I take it this wouldn't work then?

[SherwoodCleaningSe]

You should be ok using a flow controller with a trigger as any decent flow controller will have have dead end detection.  I would look at using one where you don't have to have the pressure switch wired into the circuit as I don't think that the vyair pressure switches are that good. I also find that running the vyair 7lpm pump on a controller I'm running it at about 85% of full power to get the optimum flow rate.  I think that the flow rate is over stated when compared to other pumps.

Simon.

[Pole2pole74]

Thanks Simon. 😊

[Ian Sheppard]

You should be ok using a flow controller with a trigger as any decent flow controller will have have dead end detection.  I would look at using one where you don't have to have the pressure switch wired into the circuit as I don't think that the vyair pressure switches are that good. I also find that running the vyair 7lpm pump on a controller I'm running it at about 85% of full power to get the optimum flow rate.  I think that the flow rate is over stated when compared to other pumps.

Simon.

Yes this is spot on the controller will pick up dead end once the trigger is activated stopping the pump, The advantage here is the controller will stop the pump well before the pump pressure switch kicks in. preventing issues with the PS and pressure build up in the system

Release the trigger the control detects the flow is back and restarts the pump

[Pole2pole74]

Flow controller on my shopping list now. Thanks guys you've all been a great help

[david thomas]

had the same problem got a controller no more problems