Leak - Is this a pressure relief valve?

[stardanny]

No need to drain hot water cylinder, it is not part of heating system with the AAV.

Disconnect filling loop at supply side and hang it in bucket, open isovalve ( marked number 1 as shown on photo ) on heating side to release pressure, till water stop running ( wouldn't be much water ), change AAV and put back loop to supply pipe and repressure it.

Daniel.

 

[Dan Robinson]

Nah, dust sheets, new valve, set of Spaniards and change it live. 15 seconds start to finish.

 

[G00NeR79]

No need to drain hot water cylinder, it is not part of heating system with the AAV.

Disconnect filling loop at supply side and hang it in bucket, open isovalve ( marked number 1 as shown on photo ) on heating side to release pressure, till water stop running ( wouldn't be much water ), change AAV and put back loop to supply pipe and repressure it.

Daniel.

Disconnect filling loop - Are you referring to the isovalve marked no.2? Just disconnect that, drop it in a bucket and open valve 1?
Thanks

 

[stardanny]

Disconnect filling loop - Are you referring to the isovalve marked no.2? Just disconnect that, drop it in a bucket and open valve 1?
Thanks

Yes, disconnect the one with wing nut on hose.

Daniel.

 

[G00NeR79]

All done. Nice simple job and leak free.
Thanks for all the info chaps!

 

[Alfie25]

Out of interest, why does this system (or any for that matter) need an automatic air vent. Isn't it just to cover up a problem rather than actually solve it? I've always wondered the same with those radiator auto bleed vents. Systems shouldn't keep getting air in should they, or else you'll be forever introducing fresh water to the system.

 

[Dan Robinson]

Once the initial air has vented from the system and the air in solution has extracted itself over the first few weeks and months then yes they are redundant on a properly installed system.

They are useful for that initial period.