Shower pump flow switch

[DEMPSEY1965]

Hi

Can anyone tell me what activates the flow switch on the side of a shower pump. I know it's the flow of the water but what actually does the water move to trigger the flow switch?

Regards

DEMPSEY1965

 

[SimonJohns]

A flap that triggers a switch

An impeller can cause a magnetic sensor to see the flow

And many others

 

[Sanke]

The switch is a little bit of plastic that moves up & down

 

[DEMPSEY1965]

Ok, but what moves inside the pipe that activates the switch. What I am trying to say is I have a pump that takes a about 15 seconds start when the hot is selected. The flow switch is ok but maybe something inside is sticking that moves the flow switch.

 

[SimonJohns]

Ok, but what moves inside the pipe that activates the switch. What I am trying to say is I have a pump that takes a about 15 seconds start when the hot is selected. The flow switch is ok but maybe something inside is sticking that moves the flow switch.

Water moves the switch. As it flows through the pipe

 

[DEMPSEY1965]

Forgive my ignorance here, but water isn't magnetic.

 

[SimonJohns]

Forgive my ignorance here, but water isn't magnetic.

The water spins an impeller that activates a magnetic sensor

Btw. Stop wasting time

What pump do you have. We can then advise in relation to your pump

 

[DEMPSEY1965]

Stuart Turner 1.4 twin showermate. Sorry for wasting your time but I like to know how things work or don't work in my case. When cold is selected the pump starts no proble, if I manage to get to the pump before it starts I only have to touch the flow switch with a screwdriver and it starts oh

 

[jhon lennon]

the flow switch is probably the type that takes a little minute to rise on turn on and likewise a little time to fall again allowing the stored hot water discharge out the shower head rather than have it trapped in the pipework causing banging or leaks much the same as a boiler

 

[DEMPSEY1965]

That makes sense but it hasn't always done it,started about 3 weeks ago,always started straight away.

 

[PlumbBobBob]

as it's on the hot there could be a small amount of limescale slowing down the switch