expansion tank

[heggie]

firstly i am not a plumber ,the problem i have is that my expansion tank ran out of water due to a faulty ball cock, i have fixed that problem but because the system ran dry i suspect there is now air in the system .there is a drain valve at the bottom but there is only a drip coming out .... any ideas how to bleed /force air out of the system? thanks in advance
mr heggie

 

[plumber0808]

have you tried turning the system on and pumping it round

 

[heggie]

thanks trying now

 

[plumber0808]

you can also go round all your radiators bleeding them, starting on the ground floor working upwards to remove any air

 

[smillsey]

watch out running pump if there is no water running past it to cool it,

Check you have water in the pump first by unscewing a little bit the brASS flathead in the middle of the pump and see if water weeps out

A dry pump will soon fry