Replacing Rad Valves on a Megaflow system

[MikeH]

Is the replacement of rad valves any different from the procedure for a normal vented system?

 

[manx12]

the heating circuit is the same as a closed system (combi).. turn off the boiler and programmer... drain down the circuit.. change valves.. fill system... bleed where possible... nice an easy..

 

[MarkB]

It is possible to have an open vented heating circuit even if the cylinder is unvented.

filling loop, pressure gauge, pressure relief valve & expansion vessel = unvented / sealed system

F&E cistern = open vented.

Mark