re: airlock?

[doblo7]

Hi,
I'm trying to get the air out of my central heating system gravity fed since draing down. I have been told that if i put the pump on while i have a hose connected to the drain off point downstairs that it will do it. I thought if I had the pump on while doing that I risk the chance of sucking in more air? am I right or wrong? thanks ps all the radiators are full but air bubbles are travelling out of the transparent hose pipe. thanks again

 

[clf-gas]

Which transparent hose?, the one you have on a lower drain off?.
To purge the air you start at the bottom and work up, having air purged at the highest point. From your post the cylinder vent

 

[doblo7]

Thanks Craig,
I have done that thanks. what do you thinks regards my friends advice to run the system with the drain off hose attached?

 

[gas4you]

This should only be needed as a complete last resort

Stick to normal bleed methods with heating and pump off.

 

[JohnD]

go on, tell us what the transparent hose is.