Y plan component placement.

[Steve shuff]

Great info there, thankyou.
The pump can go on either flow or return as space allows for this in the vicinity of the boiler.

 

[fixitflav]

Great info there, thankyou.
The pump can go on either flow or return as space allows for this in the vicinity of the boiler.

Had another thought, if you go for pumped return, better to have pump - boiler - open vent - cold feed, to release any air bubbles that come out in the boiler. As on attached sketch (ignore the figures, that was for a different job)

 

[Steve shuff]

Ok. That's the plan for the weekend then.
Thanks..

 

[Steve shuff]

Further question,,
As I understand it , it is advisable to fit a radiator directly across the boiler this usually being the bathroom radiator.
Can this be fitted directly to the boiler flow and return ?
What about the return from the cylinder being the last tee before the boiler ? Does it make a difference which side of the tee the radiator is connected to ?
Any advice would be much appreciated.

 

[Exedon]

Best practice is for cylinder to be last tee on the return coming in on the branch.

 

[fixitflav]

As I understand it , it is advisable to fit a radiator directly across the boiler this usually being the bathroom radiator.
Can this be fitted directly to the boiler flow and return ?

I suppose you mean having one rad without a TRV, so there is always a flow path. It still has to be pumped, so in parallel with all the other rads.

What about the return from the cylinder being the last tee before the boiler ? Does it make a difference which side of the tee the radiator is connected to ?

All the rad returns must be commoned before the cylinder return comes in. Otherwise when on HW only the rads will get warm. Because the cylinder return water has 2 paths, one to the boiler return, the other one set of rads (the "wrong" way) then through the other set the right way, then to the boiler return. You can see it if you sketch a flow diagram.