[paul alan]

I spoke to chichester pumps to buy one of these and queried wether it will work for 8800 model l have from purefreedom.

My concern is that my pump is rated 80-110 psi and the switch they have is rated at 60 psi, so the way l see it if the switch shuts off at 60 psi the pump wouldnt work?

Anyway they said that they would uprate the spring and put a tougher one in for me so it wouldnt shut off at 60 psi.

Is this the right thing to do?

Or will it work better if left alone?

[M & C Window Cleaning]

The PSI rating of these pumps is the pressure at which the pressure switch will operate to shut off power to the pump.
Whether or not it will work depends on how much pressure your system requires to push water through it.  If it requires more than 60psi to operate, then it will shut off prematurely. 
The longer the hose you use, the internal diameter of the hose and the height at which you have to reach will all be factors that contribute to how much pressure your pump needs to provide.
Fitting a stronger spring will definitely increase the shut off pressure.

[paul alan]

Thanks!

Its an ro booster pump so will only be through a short ro pipe/tube.

I think l have read some reviews of people who have used this switch and it works fine but lm not sure if l am mistaken with models of pump/switch.

In theory the pump(80-110psi) wont operate if the switch(60psi) cuts out below its working pressure, but lm not sure lm looking at it correctly or maybe lm missing something??

I have searched for switches for the aquatech 8800 ro booster and this particalur switch has shown up .

Its a bit confusing all the different info available

[paul alan]

In this listing on ebay for the same pump, it comes complete with presure switch rated to switch off at 40psi?

But then it goes on to say that the pump will boost pressure to 70-80 psi, its not making any sense to me?

http://www.ebay.co.uk/itm/Aquatec-CDP-8800-booster-pump-SET-solenoid-valve-pressure-switch-RO-Water-NEW-/201347377796

[Don Kee]

What pressure do you use to through your RO?

If its 60psi or less then it'll work, if you use more (I had mine working at 80psi when I had one) then it wont....


Added - you posted just as I did, not sure about your linked one. The 8800 works off the pressure switch (no controller) so basically what ever you set the pressure switch to it what pressure you have running through your system.
Will look at your link and add to this post


The pressure switch in your link is for the solenoid valve, not the pump; the pump has its own pressure switch at the head

[paul alan]

I have been on the aquatech site and confirmed which model pump l have and its operating at around 80 psi, according to that it gives 1 litre per minute which is what mine gives . The limit for the bypass is 110 psi but lm not sure what the bypass function does.

I have contacted pure freedom and all they can tell me is they dont stock pressure switches.

I have spoken to chichester pumps who supply the pressure switches and asked them, they offered to uprate the spring to a higher psi, but couldnt advise me on wether or not l should uprate it-they didnt know.

I have emailed aquatech but didnt get any responses

[Don Kee]

The people that supply the pressure switches for the pump couldn't tell you if the pressure switch was right for your pump...?

Can't help with suppliers I'm afraid, but it's my understanding that if your system/pump is running at 80psi (get a pressure gauge if you haven't already) , you need a pressure switch that at least matches.

It's like using your shurflo pump without a controller. Your pump/pressure switch them dictates the pressure of the water coming out of your pole. (The water flow is just one speed, max!)

[paul alan]

Thats how lm thinking of it!

But in that listing it says the switch is rated at 40psi and the pump at 80psi, l dont want to get the switch uprated and then something goes pop.

I dunno!

Cheers though

[Don Kee]

I added to one of my posts above

The switch advertised in your link is for the solenoid, i.e for shutting pump and RO off when tank is full

[paul alan]

Now lm even more confused, will call chichester again tomorrow and maybe try ringing aquatech

[Don Kee]

The link that you put up is for the pump AND a solenoid valve

If you ordered from pure freedom then you only have the pump, so anything relating to the solenoid valve isn't relevant to you

You need the correct pump pressure switch for regulating the pumps pressure output

I think you need a switch rated to a minimum of 80psi as thats what you run your system at

Cant help on suppliers though

[Don Kee]

Hopefully someone like spruce will come along and help you with this. It may be you can use a lower rated pressure switch (I dont think you can but I'm doubting myself now)

Spruce is the dogs danglies with stuff like this

[Spruce]

Now lm even more confused, will call chichester again tomorrow and maybe try ringing aquatech

Which I would think is the best thing to do.

I would be rather hesitant with the supplier adding a stiffer spring to increase pressure (which it will do.) What happens if the spring is too stiff and the pump overheats as it working too hard?

There was a post about the request for an Aquatec pressure switch some time ago on one of the forums. I have absolutely no recollection of who the poster was or of the outcome of it.

I've looked at the link provided and am also having difficulty with why someone would want and external (inline) pressure switch and solenoid valve in the same kit for window cleaning. I can't see why I would need them to work together.

I think we worked out previously that an Aquatec booster pump doesn't have a built in pressure switch, but rather uses a bypass pressure relief valve to regulate the boost pressure.

.

[paul alan]

It was me with regards previous post, l couldnt work it out then so l put it on the back burner till now.

What lm trying to do is make things easier.

And part of that is to fill my tank directly from the 450gpd ro instead of filling the 1kltr ibc and having to transfer on a daily basis. So l have installed an outside socket close to the van. Have made some storage there too, to house the ro system and pump(and l can charge battery in van aswell, weighs a ton)and can feed some tube into van to fill it directly. But l dont trust myself to remember to switch it off in time before it overfills, so need it to self shut off when full. I have a float valve but the only thing left is presure switch to turn off pump.

I cant fit a timer inside the outdoor weatherproof socket as there isnt room to shut the lid.

Thanks

[Spruce]

I'm confused  as to what the solution with that kit is to what you wanting to achieve.

I have a think about it tomorrow.

Alex Gardiner used to sell a controller that switched the booster pump off when the float switch cut power to the solenoid valve.

He doesn't do it anymore . It must have come from somewhere.




Maybe a 24v normally off solenoid valve with a 24v dc relay so power to the pump is cut with the float switch switches power off to the solenoid valve.

[Spruce]

I added to one of my posts above

The switch advertised in your link is for the solenoid, i.e for shutting pump and RO off when tank is full

But how does it work Don?