Hello,
I replaced the radiators and pipework on the first floor of my house a
few weeks ago, however some rads heat through the return when the HW is
on.

I have a boiler at the opposite end of the house on ground floor which
has a feed up to the 3 way valve by the cylinder, which then returns
out with the rad returns joining in two locations just before the drop
down back to the boiler. The downstairs rads return also comes up next
to the return and feed and joins the above return. Making sense? I
followed the original layout but needed to change that because of this
but it still occurs.

The return comes from the cylinder back to the boiler so where should I
join the return from the rads? Is it helping that 3 rads connect to
one run then to the cylinder return with one seperate rad joining at
the same section within 5 inches? Space doesn't allow me to connect it
to the rad return easily...

This is probably a nightmare for anyone to help with due to my garbled
explanation (I do have a diagram if anyone wants it) so any help is
really appreciated with how I should redesign this?

A- Return from cylinder to boiler (drops down to ground floor)
B- Radiator Return joining 3 rads each heat when HW is on
C- B joins A
D- D joins A (4th radiator which joins cylinder return seperately,
doesn't heat with HW)
E- Return from downstairs rads joins A (Doesn't heat from HW)

|--- Rad
--------------------------------------Rad
|
|
| A
C |D |--------------E

----------------------------------------------------------|-----------------|----------
Rad ------------- |
----------------------------------------------------------|-------------------------
| --------------Rad
| B
|
Cylinder
Boiler

Should I try to connect D to B so all rads are on same return then
connect to A as it is?

Many thanks for any help that you can give.

Jamie