pressure release valve?

The pressure release valve only blows off at or above 3bar pressure.

Check what is your pressure when system is totally cold (should be 1 - 1.5 bar) if it is above this bleed some water from
one of your radiators until at 1 bar, then all should be fine.

If it already reads 1 - 1.5 bar, but when heating system is on rises to above 3 bar then the expansion vessel in you system may either need recharging or replacing.

T
March 2008

If you're constantly seeing water dripping form the pr pipe then it could be-
faulty pr valve

filling loop passing allowing water into system until it reaches 3bar+ and leaking from pr.

faulty h/ex allowing same prob as above.

if you see water dripping when the heating is on then could be expansion vessel.
this prob would be like:
boiler cold-pressure guage 1 bar-no water from pr

boiler hot (heating on a while) pressure guage 3bar+-water from pr

cold again-1 bar or less and requiring top up.

ideally boiler would be 1 bar cold and rise to 2---2.5 max when heating on.

iain
March 2008