Bleeding Radiators

[slid_away]

Hi all
When bleeding radiators, do I do it while the heating is on or off? Also I have heard I start downstairs first. Is this correct?
Thanks in advance

[The Builder]

I always think it makes sense to have the heating on. The pump going helps to push the air out of any badly designed runs or "dead legs".
Everyone has their own way. I don't think it matters where you start, as I usually go back to the beginning and start again in case I've pushed some more air around the system.

[Buenchico]

Turn the heating off. (You're trying to get rid of air in the system. Working with the heating on could put more air into it!).

Bleed downstairs first and, if necessary, don't forget to top up the boiler!

http://www.ultimateha...eeding_a_radiator.htm

Chris

[anneasquith]

i know someone who bled his radiator with the heating on, and suffered quite a severe burn from the water.

[The Builder]

As I said Chris ............. everyone has their preferred method.
I've worked with a lot of plumbers who would always have the pump running. Air shouldn't be introduced into a sealed system.
In the end it's the result that's important.

[slid_away]

Thank you all very much for your answers.

[AlBags]

Pump running. All valves open (2-port or Mid-Pos valve) so Cyl stat. and Room stat. calling for heat.
Start at highest rad or air pocket near Boiler first. Then nearest to pump working away. Often there is a bleed in the top of the boiler exchanger.
Check the primary cylinder feed too .. there should be a bleed near the top of the coil entry to the cylinder.
Keep pressure topped up to around 1-11/2 bar (warm) if pressurised system.