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Discuss Help with Rayburn airlock in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

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I have a Rayburn connected to hot water cylinder indirect with radiators which turn on when at certain temperature. The system has been working for many years with no issues, but when I drain the system I get an air lock which sometime sorts itself out when the temperature gets to 90 deg.

I have drain the system yesterday to install a second radiator but this time the air lock will not budge. The radiators are turned on, I have tried running the rump continuously. At present the radiators do get hot but this also now blows into the header tank. I think the air lock is with in the cylinder coil and due to this the pump is back feeding the wrong way to the injector T.

Attached is a diagram, I was thinking would it be a good idea to put a gate valve 28mm where the pink star is on the diagram to close off when filling up. This should hopefully force the water through the cylinder coil and then open when full. Would this reduce the likely hood of an air lock.
 

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