Powermax 155 Temperature Control?

[trickstar]

the water is so hot, how can i reduce the temperature?

there's nothing on the control panel

 

[Onetap]

the water is so hot, how can i reduce the temperature?

The hot water from the taps? If so, you'd have to adjust the thermostatic mixing valve, the 3-port valve at the top right of your picture. The ones fitted to the Powermax frequently fail, so adjustment may not work.

 

[trickstar]

you mean this one

the black knob just turns freely or is it the screw i should turn clockwise?

 

[Onetap]

the black knob just turns freely or is it the screw i should turn clockwise?

That's it. The black knob is an anti-tamper device. Undo the screw, remove the black knob and there is a square adjuster under it. Rotate the adjuster clockwise with an adjustable wrench or the right-sized spanner, if you have it. Re-fit black knob on completion. The outlet temperature shouldn't be below 55-60degC.

If it has gone out of adjustment, I'd suspect that adjustment may make no difference, in which case a new TMV would be required.

 

[Agile]

The moving inside part usually jams.

Has anyone ever had any success with cleaning them in acid?

 

[trickstar]

do i need to open nut (2) as shown to be able to turn the square adjuster?

also how will i know how much to turn.

thanks

 

[Agile]

Yes, I think you loosen screw 2 and turn square 1 say two exact turns keeping a written note of the movements.

However, as I expect the inner part is jammed up it may not do whats expected.

Most people here just replace them because that ensures a solution for the customer.

Without a new spare I would remove the unit and see if I could clean it with 10% HCl.

Tony