Radiators - help

[kevplumb]

if the last rad is closed it will only flow to the ones that are open ie the second one

 

[Plump Bob]

My heating works now A friend came round and we plugged a hose pipe into the draincock at the end of the radiators and pumped water into the system, bled each radiator until water came through and, finally, water burst out of the expansion feed into the cistern. So, I reckon that might have cleared the blockage!

It now works pretty much as it did before but it's less noisy, I guess because there's less air in the system now.

A couple of questions though:
1) The last radiator in a circuit of 6 takes much much longer to heat up than the 5th. The space between them isn't huge. Any ideas?

2) The pump seems to get quite hot. Is that normal?

Thanks

 

[kevplumb]

close the locksheild down on the 5th and open it on the 6th

pump will get warm its moving hot water

 

[Plump Bob]

...err, lockshield, is that the valve that controls the flow out of the radiator?

 

[kevplumb]

quick off the mark today

locksheild valve is the one on the other end
either pull the cap off or there will be a screw in the top

adjust it with a small spanner

 

[Plump Bob]

quick off the mark today

lol thanks

So, if I close it down totally, on the 5th and open it totally on the 6th, how does it work, what's the theory (briefly) behind it.

 

[kevplumb]

whats happening is the water is taking the shorter and eisier route
ie easier to run round rad 5

so if you introduce more resistance in 5 pump pushes it to the next one in line ie 6

 

[Plump Bob]

So, should 5 be totally closed and 5 will still work normally won't it?

 

[kevplumb]

close the valve then open it say 1 turn see how it goes if its cool open it another 1/2 turn
its all a bit try it and see the last one should be more or less full open

 

[Plump Bob]

Thanks