Removing air lock

[c.gas]

Hi guys,

i spent litteraly hours today trying to get air locks out off gravity fed system, I started it yesterday changing 3 port valve and boiler was just banging and then go off but had to leave it as I ran out of time. Went back today and pump had burnt out so had to put a new one on. Took ages to get the air out and that was back filling with mains pressure as well.

I as just wondering if it would be worth added on a aav next time, just seen a self cutting iso valve 22mm to 15mm and then can attached aav to that.

would it make any difference?

 

[jonnyswamp]

Shouldn't have took that long mate, sounds like the cold feed could've been partially blocked, as well as bad pipe runs causing air locks
Was 3 port set for filling

 

[c.gas]

Yeah mate it was open for filling. Think it's just a bad install, everything on drops and couldn't even access the f&e tank in the loft as it was behind the header tank and the loft was that small and narrow I couldn't get past it

 

[GasmanxxxR1]

Back fill it through a drain off with mains

 

[bright spark]

Backfill is d way alright once there's a decent overflow off d f&e tank.
If ye have tried this tell customer they need t pressurise system

 

[c.gas]

Thanks guys, would you just back fill it straight away all the time on gravity fed system or wait and see if it airlocks first

 

[GasmanxxxR1]

I normally fill it from the header tank, make sure the cold feed is properly teed into the vent pipe.

I used to be a BG installer so re filling systems and dealing with airlocks was a daily occurrence