Rads, pipes and advise!!!!

[darren7]

I am just about to start running my pipes for my radiators, please could you give me some advise. (combi)

It it always correct to use 22mm fully for the flow and return?

Where is the best please to fit an automatic bypass valve, and does this valve have to be able to got at, or can this just go under the floor boards?

The whole system will be new , so Im staring from scratch, anything else to look out for?

Thank you,
Darren

 

[oilman]

It is not always correct to run 22mm pipes. If you only want to pass 13.5kW they're OK, but more than that will need 28mm. Don't go hiding anything under floorboards, some poor sod will have to service it sometime. You really ought to do lots of reading about central heating. This forum is really a help for specific questions, it can't satisfactorily give a painting by numbers approach for system design. Try looking in the how to sections perhaps, but books and lots of time are better.

 

[darren7]

thank you, reading hard.

still cant see the best location for the auto bypass valve, like how near to the boiler do they really need to go.

Darren

 

[oilman]

It has to be from the pump output to the return pipe and is to provide circulation if all rads shut down.

 

[PaulAH]

And don't do what I did - plan the plumbing for a straight in-line valve. They are painfully expensive (unless I've simply been robbed). Right-angle valves are more common and cheaper.

 

[darren7]

could you have not just fitted a couple of 90`O to it?

Darren

 

[PaulAH]

If there had been room, but it was a tight spot. I wimped out and bought the thing (Danfoss) rather than risk screwing up the existing pipework.

 

[oilman]

Two 45 degs would do.