Air in UFH nightmare

[Riley]

Afternoon all, I am looking for a couple of pearls of wisdom if anybody can help me. Fitted a new boiler in a large house with nothing but underfloor heating. Install was absolutely fine but we are now suffering badly with air trapped in the system I just wondered if anybody had any good hints and tips for bleeding an underfloor system as it’s killing me. Cheers in advance

 

[ShaunCorbs]

Open ends and a hose pipe or if the manifold has hose pipe connections use them

Do one zone at a time and give it a good run

Or you can run a shower pump and a bucket so you don't waste water

 

[sammathias]

Can't you just pump around one circuit at a time until any air is passed through an aav then shut that one down and move onto the next?

 

[ShaunCorbs]

Can't you just pump around one circuit at a time until any air is passed through an aav then shut that one down and move onto the next?

Pump isn't strong enough

 

[Riley]

Bright spark original installer didn’t put in an aav and there is literally nowhere to cut one in as it’s all beautiful finished (idiots). Each manifold has a single hose point so I think Shaun’s idea may be my best bet. Such a pain in the backside though

 

[Chalked]

Got to start from th beginning.
Isolat rhe manifold and turn all flow restrictors off. Connect mains hose and fill each loop, one at a time. Some manifolds need to have the pump removed to stop the water short cutting.
Allow a few hours and run each loop until it’s fresh water.
When finished, dose with biocide