air in radiator

[dave1h]

hi all.

i keep getting air into my bathroom rad. its quite a tall rad and higher than the rest of the rads in the house, its also upstairs, the boiler is a ferroli optimax 38 c, it s supposed to be a sealed system, so why does air keep on getting there

ps its ony that one rad.

hope this makes sense

cheers dave....

 

[superdupergasman]

Might be nitrogen rather than air....can be early sign of corrosion starting.

Try adding some inhibitor to the system and it should help.

 

[gas4you]

Do you have to keep re-pressurising the system?

if so new water could give of 'air' when heated.

You could also have a 'leaking' joint that is sucking in air to the system on the negative pressure side of the pump.

 

[dave1h]

yeah i have to keep pressuring the system every 10 to 14 days or so.

carnt see any leaks,

all the rads are quite new, say about 10 months,

 

[superdupergasman]

expansion vessle might be flat in boiler and thus dripping water out the pressure relief pipe thus dropping pressure and then you refilling with fresh water and air.