adding a extra radiator

[micky]

Ive connected a extra radiator with 15 mm pipes to the 22m flow and return pipes the water starts to go down to the radiator but dos'nt seem to return.is there a limit to how far the radiator is from the flow pipes.

 

[Puddle]

close the other rads,see if it flows through new rad,if so maybe air lock moved or rads require balancing ,with in reason distance should not be an issue if only one rad on system,used to drop down from ff flats to entrance hall rad below,once set p,operation Ok but first to play up if a problem