Heatrae Sadia Megaflo problem

[magicman]

6 mixers

 

[Neil K]

Stick non return valves on the 6 hots.

 

[Best]

If you now have a 3bar pressure reducing valve on incoming mains (assuming it is working) and water is still discharging at Megaflow, then unless you have another branch of the mains somewhere else that is not pressure regulated & going to a mixer, you must have something wrong at Megaflow.
Are you sure that you don't have a sealed heating system with its discharge pipe linked into Megaflows discharge? Filling loop passing water?

 

[Neil K]

Or mains mixing with the hot at one of your six mixers. You need a G3 plumber fellow

 

[magicman]

Yesterday, I turned the water of to the entire house.

Opened lowest hot, and opened T&P until drained.

What confused me is that, although the discharge through the tundish slowed to a drip, it was still dripping continuously even though the hot is drained and the incoming is off!


PS. G3 is coming round again this week. This forum will possibly help me tell him any suggestions.

 

[Neil K]

Have you had the t & p valve changed?

 

[Best]

Does sound like you have a faulty valve (which I think you got replaced?). Maybe a bit of crud in it?

 

[Best]

Yesterday, I turned the water of to the entire house.

Opened lowest hot, and lopened T&P until drained.

What confused me is that, although the discharge through the tundish slowed to a drip, it was still dripping continuously even though the hot is drained and the incoming is off!


PS. G3 is coming round again this week. This forum will possibly help me tell him any suggestions.

A decent G3 plumber should be able to narrow down to whatever is causing the discharge in a matter of seconds!
Only thing that would cause any problems for a plumber would be if he found it to be a mixer somewhere passing, but couldn't isolate them to test.

 

[magicman]

Have you had the t & p valve changed?

Water through tundish is cold. When I hold open the T&P it comes through hot.

 

[magicman]

A decent G3 plumber should be able to narrow down to whatever is causing the discharge in a matter of seconds!
Only thing that would cause any problems for a plumber would be if he found it to be a mixer somewhere passing, but couldn't isolate them to test.

I think that's the point in which he's at. Shower mixer iso valves behind tiles etc...

 

[magicman]

It was doing it before it got replaced. But since then, the (new) 8bar relief has been taken off and cleaned...