Hi Thanks for the input.
Like i said i googled, and most of the suggestions you have came up with was what i found out. Another zone valve and the 3 way valve at the thermostaic valve. The by-pass is one i missed. ( and the plumber )
I dont understand the purpose of the 2 way they just fitted, surely the whole point is if the water is still hot then it should shut and recirculate around the manifold and Underfloor? If so i'm sure the pump is the wrong way round also?
Actuators are another matter, they have it set up with constant running? 2 of the loops don't have a thermostat.
Regarding the HW, the bath has its own mixing valve.
thanks
OOh dear. Thats a Rehau UFH manifold set up you have there.
Thats their "Compact mixer Unit" which includes a high limit stat.
You need your plumber back asap to rectify it as the pipe laying is incorrect.
I'll see if I can google a schematic for you to arm you with some knowledge. (
Its covered in "Technical Manual 864.602EN)
http://www.scribd.com/doc/56599984/8179-Rehau-Ba-Controller-864602-Uk
Page 10 and 11 (Section 2.2)
System flow is to the bottom manifold. The one with the actuaters which is the return from the ufh.
So mixing takes place through the return manifold.
The sensor probe should be inserted in the valve you see on the right of the bottom manifold.
I think it has a capilliary line "packing gland" for wet insertion. Which is the professional way to do it incidentally.
Your current set up is likely dumping boiler
high temperature flow into some of the loops.
Not what you want!
A zone valve should be fitted also as already stated and a spring loaded by-pass valve fitted as recommended by Rehau.
The TIV should be set to design flow temperature and the HLS set 15C above design flow temperature as also recommended by Rehau.
A Rehau type BA controller should also be incorporated to operate the 24 volt actuaters and will provide outputs for the secondary pump, main pump and boiler.
So this system has been running for 18 months with no blending facility from the primary circuit and when the guy comes along he fits it totally wrong. Ooh dear oooh dear ooh dear.
I'm off now to do some pipe laying.