Replacing & bleeding a radiator

[chas2008]

I will shortly need to replace a radiator, up until recently i had the old fashioned c/heating system which i knew inside out and carried out all my own plumbing / repairs .
I now have a condensing boiler which i know is a sealed system ( bit of a new area for me ), after replacing the rad is it as simple as opening the bleed screw , forcing the air out with the filling loop then pressurising it back up again ?

[The Builder]

Pressure up with the filling loop, turn the heating on to get the pump running, bleed, then re-check the pressure (filling loop again).
That's the way I do it Chas. Others might have a slightly different sequence.

[pilotlight]

Chas, Indeed it is as simple as you say. You may need to re-pressurise the system whilst you are bleeding the radiator (depending on the size of the rad).
Don't forget to pressurise to boiler manufacturers recommendation, usually between one bar and one n' half bar.
Hope this helps.

[chas2008]

cheers for that, just confirmed what i thought, just one thing that may be of interest to you guys, im running 8mm microbore and more than one engineer said it wouldnt work with a condensing boiler, they were so wrong, it works with absolutely no problems at all.

[pilotlight]

chas, condensing boilers feed the system basically the same as older type boilers. Therefore, 8mm can be used for the flow / return to rads. Obviously, if you attempted a long run of 8mm to/from the rad, it would not be satisfactory, and may ask too much of the pump.
If you only use a couple of metres or so, you should be ok.

[chas2008]

worded that a bit wrong, when i say im running 8mm i meant the house (large 4 bed detached) was originally plumbed with 8mm, and when i asked for quotes on replacing the old boiler i was told the new one wouldnt work with microbore and the pipework would need replacing with 15mm . I must add not everyone agreed with this hence my new boiler with microbore....