The open vent pipe will be on the flow pipe, usually continuing up from where the flow pipe turns horizontally across to enter the cylinder. The vent pipe then rises above the F&E tank, inverts and terminates pointing down towards the water surface. Surely you have one?
Here's a diagram of my setup, i'm wishing to either put the pump in Location A or B....... putting the pump on the bolier return pipe is not an option due to pipework location......thanks again to chris, bster and agile.
you should also wire it up as a C plan zone valve system & power the pump with the orange on the valve i think? not run of the mill though & pump speed 1 .
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