Hi there, I need to change the AAV on my Baxi 80HE as it got corroded and likely not venting any air. We have some air noise when the hot water is running (but not the CH) We had a bum Expansion vessel which has likely caused the leaking of the AAV
Can i just check the procedure is as follows.
Isolate the boiler from cold water supply with ball valve by it.
Drain down system from radiator on ground floor (Boiler is in the loft)
Unscrew and replace AAV and Oring. Make sure plastic screw on top of aav is lose so air can be vented.
Repressurise to 1bar.
Bleed Rads then set to 1 bar again
Does that sound correct?
Edit: I don't think i have to drain the rads. Just isolate return and flow central heating points then use a hose on the boiler drain point to just drain it down?
Can i just check the procedure is as follows.
Isolate the boiler from cold water supply with ball valve by it.
Drain down system from radiator on ground floor (Boiler is in the loft)
Unscrew and replace AAV and Oring. Make sure plastic screw on top of aav is lose so air can be vented.
Repressurise to 1bar.
Bleed Rads then set to 1 bar again
Does that sound correct?
Edit: I don't think i have to drain the rads. Just isolate return and flow central heating points then use a hose on the boiler drain point to just drain it down?