Help with Rayburn airlock

[motohomer14]

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.

 

[brum]

why not fill it up with a hosepipe connected to drain cock

 

[exedon2]

What model is your Rayburn? Fuel?
Picture of pipework in airing cupboard would be useful especially where open vent is connected.

 

[Elizabeth]

why not fill it up with a hosepipe connected to drain cock

Hi,am desperately wanting help with an air lock in an Aga heating system. its old and a direct system, hot water runs barely warm and pipes banging every hour or so when both the cold and hot pipes at side of aga get too hot. There is a valve thing on the cold feed, and I think I am supposed to put a pipe from the mains on there, but do i drain the hot tank first? Any help appreciated, I have tried five plumbers over a period of 3 months and am still waiting for one to appear! The aga will be cold before I attempt anything! Thanks if you can help me with sequence of doing this

 

[exedon2]

Not altered any part of system?
Hard water area?
Picture of said valve!