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Discuss Air in UFH nightmare in the Water Underfloor Heating Installations area at PlumbersForums.net

Riley

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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

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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

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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?
 
OP
Riley

Riley

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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

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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
 

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