New radiator in loft causing problems

[jase158]

that pipe to right of pump, did plumber fit it? the one with white handle on it!!

 

[Stevemarch1969]

No that's always been there.

he only teed into ch flow and HW cylinder return.

 

[Best]

that pipe to right of pump, did plumber fit it? the one with white handle on it!!

Think it is below the pump if the picture was right way up. Don't think that should be joined in there, if it is before the 3port. I am confused!

 

[Killy Bing]

Think it is below the pump if the picture was right way up. Don't think that should be joined in there, if it is before the 3port. I am confused!

Lock shield as a bypass from the look of it......an attempt at one atleast

 

[jase158]

yeah it shouldn't, 3 port valves automatically close to h. water. Heating should have bypass or 1 rad with no trv on it. please close it by turning clockwise. then try it. make sure 1 rad either doesn't have trv or TRV head is taken off if they all have trvs!!

 

[Stevemarch1969]

Think it is below the pump if the picture was right way up. Don't think that should be joined in there, if it is before the 3port. I am confused!

pump is at top so pic needs rotating one turn quarter clockwise to be right way up.

 

[Best]

No that's always been there.

he only teed into ch flow and HW cylinder return.

Kind of says it all! Joining to CH flow & then cylinder return won't work IMO.
Get a heating engineer to repipe the rad.
Either just use the cylinder circuit, so new rad will only work when hot water on sadly,
Or have the new radiators return pipe joined into the returns of the rad circuit somewhere if this is feasible, but NOT into the main circuit!

 

[Stevemarch1969]

Towel radiator in bathroom has no Trv all other rads have TRV.

So are you staying tighten the white lock shield in the pic?

 

[jase158]

Kind of says it all! Joining to CH flow & then cylinder return won't work IMO.
Get a heating engineer to repipe the rad.
Either just use the cylinder circuit, so new rad will only work when hot water on sadly,
Or have the new radiators return pipe joined into the returns of the rad circuit somewhere if this is feasible, but NOT into the main circuit!

Its a lot easier to connect into the hw return though as that's the only returns in loft, saves breaking walls etc. non return should of solved this though!! The issue is the bypass, bet it was blocked before and he moved it by cutting and soldering new fitting and caused back flow. Need to shut valve and replace with automatic bypass valve!!

 

[Killy Bing]

None of what you have shown or have described looks or sounds right....i don't think the installer in the first place had a great deal of an idea about what they were doing tbh!!