I have a 1100W water pump and a water pressure switch which fails to control it. The switch supposedly starts at 1.5bar and stops at 10bar (it is not clear when it stops, but it says "10bar, 10A". The pump can never reach 10bar, and a good thing too, and so the switch never stops it. I would like the switch to start at 1.5 bar and stop at 3bar, and without oscillations. Is there a particular brand/model I should be looking for?
Water pressure switch for water pump
- Thread starter akist
- Start date
The switch will be rated up to 10Bar pressure and a max current of 10A
What pump is it? Are you talking about say a surface or submersible kind of water pump, used for say draining basements or the like? Or are you talking about a potable well or accumulator type pump?
What pump is it? Are you talking about say a surface or submersible kind of water pump, used for say draining basements or the like? Or are you talking about a potable well or accumulator type pump?
I have now realised the switch/controller (WAPS002) is not possible to adjust manually, and it is set at the factory for 10 bar... I need to buy an adjustable controller.
Attachments
- Joined
- 27 May 2011
- Messages
- 2,160
- Reaction score
- 1,131
- Country
Try here
pumpexpress.co.uk
Water Pressure Switches Archives
Water pressure switches, also known as flow switches are electronic devices used to automatically start and stop the electric water pump according to the set pressures. As well as automating the pumps the water pressure switches also protect the pump from dry running.
pumpexpress.co.uk
It is a normal water pump, 1100W, intended to take water from a tank (about 900 litres) and feed it to the house. The tank is about 1.5 floor levels high and there is enough gravity pressure to run the ground floor taps, but not upstairs.
The tank is needed to alleviate water shortage related mains interruptions.
Normal mains pressure is an incredible 5 to 5.5 bar ... If water supply is switched over to the tank, I'd be happy with 2-3 bar.
I need a controller system to start the pump at about 1.5 bar and stop it at about 2.5-3 bar.
It seems the various "cheap" electronic controllers (about £50) cannot be adjusted when to stop the pump, or at all.
Therefore I realised I need a mechanical pressure switch, to adjust when it starts and when it stops the pump. And an expansion tank to smoothen the operation.
I also realised I would also need detection of "tank empty" and stop the pump when dry. I think that would then require another pressure switch, I am not sure.
To detect when the tank was empty you would need a float switch not a pressure switch in series with your other controls.
There seems to be several pressure switches that might meet your requirements here
There seems to be several pressure switches that might meet your requirements here
Last edited:
I want to detect "no water reaching the pump" in general, so as not to run it dry and burn it. It could be an empty storage tank, but it could also be a closed valve or a blocked filter etc.
For that I *think* I need another pressure switch to break contact at low pressure, rather than make contact.
For that I *think* I need another pressure switch to break contact at low pressure, rather than make contact.
Yes, you require another pressure switch that breaks at a minimum pressure, (tank head) and remakes at a pressure corresponding to a minimum tank (head) level, wired in series with the pump start/stop pressure switch, additionally, because your house demand won't be continuous? you will/should require a small accumulator to prevent the pump cycling on/off too rapidly. If, say, you have the pressure switch set 1.5bar/3.5bar, and a 50L accumulator, precharged to 1.5 bar then the accumulator will store 22L at 3.5bar and assuming a flowrate of say 15LPM the pump will not restart for 1.5 minutes in falling to 1.5bar.
You will also require a double type non return valve on the mains supply.
That seems a very big pump at 1100W for a domestic house supply, the Stuart Turner type are around 500W and will pump ~ 20LPM at 3bar depending on model chosen.
Can you post any/all details of your pump, there should be reasonable labelled info on the pump, take a note of all this info or a snapshot and post it on.
You will also require a double type non return valve on the mains supply.
That seems a very big pump at 1100W for a domestic house supply, the Stuart Turner type are around 500W and will pump ~ 20LPM at 3bar depending on model chosen.
Can you post any/all details of your pump, there should be reasonable labelled info on the pump, take a note of all this info or a snapshot and post it on.
If you are pumping into the mains then you will require that DRV, otherwise you might be supplying the whole country?
What are the pressure ranges of the two ordered PGs?
Will revert later, must go out for a few hours.
What are the pressure ranges of the two ordered PGs?
Will revert later, must go out for a few hours.
Pumping from storage tank into house.
The pressure switches are mechanical and adjustable, from what I understand.
So the discharge from the pump is not teed into the mains supply in the house?
The WAPS002 just says it can withstand 10bar pressure, surprising its not adjustable and even if it isn't it should have a cut out pressure of 3.5/4.0bar. It also states it has run dry protection but the MIs don't give any info on these points.
The tank is ~ 1.5 floors height so ~ 6m, 0.6bar so your own run dry protection switch must be settable down to a very low pressure, the pressure gauges have a operating range, hope yours is suitable for this.
The pump has a deadheaded pressure of 4.6bar so you could safely set the cutout pressure to 4.0bar, will give you 25L in the accumulator and a bit more breathing space.
The WAPS002 just says it can withstand 10bar pressure, surprising its not adjustable and even if it isn't it should have a cut out pressure of 3.5/4.0bar. It also states it has run dry protection but the MIs don't give any info on these points.
The tank is ~ 1.5 floors height so ~ 6m, 0.6bar so your own run dry protection switch must be settable down to a very low pressure, the pressure gauges have a operating range, hope yours is suitable for this.
The pump has a deadheaded pressure of 4.6bar so you could safely set the cutout pressure to 4.0bar, will give you 25L in the accumulator and a bit more breathing space.
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local