[Mike Halliday]

So I have this unit that I want to use for applying TFR onto F&S before cleaning. I need to fit a trigger so it’s not spraying all the time, when I cut off the flow the pump is not turning off… more like the pump motor is straining. I’m guessing the pressure switch is faulty or needs adjusting

Any opinions?

[NWH]

Just disconnect it and bypass it you don’t need a switch on a pump.

[NWH]

Just use the 2 wires that come out the top of the pump I’ve done that forever.

[JandS]

Only problem connecting battery straight to pump is pump is pumping at maximum all the time......wear on pump and wasting TFR.

[Spruce]

So I have this unit that I want to use for applying TFR onto F&S before cleaning. I need to fit a trigger so it’s not spraying all the time, when I cut off the flow the pump is not turning off… more like the pump motor is straining. I’m guessing the pressure switch is faulty or needs adjusting

Any opinions?

On the pump's head there is a small pressure switch adjusting screw. You need a tiny Allen Key to adust it. It looks like you will have to remove the pump from the box to see it. If memory serves me, turn it anti-clockwise reduces the pressure the switch cuts out on.

Now, if that doesn't work, then there is the possibility that the contacts of the microswitch switch have fused together. You will then have to replace the microswitch.

[Mike Halliday]

Spruce, I thought of that, I’ve actually drilled an half inch hole in the box directly under the pump to access the adjustment screw  I turned it a complete turn anti-clockwise to see if it made a difference but not.

J&S, I think if I connect both wires going to the pressure switch it will still go through the controller to adjust the pressure, as long as likeNWH says the pump will still be ok

[NWH]

You don’t need to include the pressure switch at all unless it’s a warranty job that I’ve had a pump installed with say the heater etc,everytime I’ve installed a pump I’ve always disconnected the switch and just wired up with the 2 wires out of the top of the pump.
Trust me the pumps last longer. 

[NWH]

The new V16 controller detects when you’ve dead ended the pole or pulled the univalve and will still shut the pump off.

[NWH]

The old wiring on that lot looks top notch 🤣🤣🤣🤣

[Missing Link]

Spruce, I thought of that, I’ve actually drilled an half inch hole in the box directly under the pump to access the adjustment screw  I turned it a complete turn anti-clockwise to see if it made a difference but not.

J&S, I think if I connect both wires going to the pressure switch it will still go through the controller to adjust the pressure, as long as likeNWH says the pump will still be ok

As Spruce has said, it'll  be the pressure switch.  It's been a good few years since I've replaced one, but they're not hard to do. 

I think it was about £3 for a new switch.

If you want to do this option, let me know; I'm sure I've a spare pressure switch knocking about (somewhere).  I'll dig it out and the markings on the side will let me know what kind you need.

[windowswashed]

You don’t need to include the pressure switch at all unless it’s a warranty job that I’ve had a pump installed with say the heater etc,everytime I’ve installed a pump I’ve always disconnected the switch and just wired up with the 2 wires out of the top of the pump.
Trust me the pumps last longer.

Always done it the same way, on my second flojet pump in 20years.

[Mike Halliday]

So I bypassed the flow switch and now it blows the fuse after about 5 seconds 

[Smudger]

have you disconnected the pressure switch?

test the pump by putting the pos and neg wires to a battery to see if it runs ok

Darran

[CleanClear]

So I bypassed the flow switch and now it blows the fuse after about 5 seconds 

What controller have you got on it ?

[Mike Halliday]

This one

[CleanClear]

Ok, pretty sure that is just a PWM motor controller. You will need to use your pressure switch. You need to pull the pump out the box and replace the microswitch.

[Smudger]

Yes pressure switch needed - have used these in the past - never again - just buy a spring manufactured item -

Darran