UFH how to change blending valve

[willybob123]

Hi

I have a leaking JG blending valve on my UFH

The leak is on the upstairs manifold (the second manifold being downstairs)

What is the correct procedure for changing the valve body ?

? Should I isolate both manifolds with the valves then turn the water off and drain ?

Thanks for any input

 

[Madrab]

Are both manifolds serviced by the same Blending valve and pump assembly? Normally there would be one for each.

You will need to isolate the manifold and valve/pump assembly from the CH system and depressurise the UFH before it can all be disconnected.

 

[willybob123]

@Madrab Thank you !


If anyone comes across the same problem you can buy just the headwork for the valve here;

Reliance ZEAD970255 Thermomix Blending Valve Headwork

Replacement Reliance HEAT970256 Thermomix Valve Headwork - ZEAD970255 This product will also replace NuHeat PM1A/Headwork-C for the PM1A.

underfloorparts.co.uk

As suggested aboved close the manifolds, turn the water off and drain the taps at the lowest level then swap over