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Turn your 2 rad valves off undo bleed screw fit hose pipe water wont come out till you turn valves back on. I use these all the time just that systems I use them on are pressurised so I get a little water comin out till pressures gone....

have a vokera compact 28kw Im tryin to fit a room stat to it. In book shows me were to wire it but there are already 2 black wires that go to plug on pcb were its telling me to connect to. disconnected 2 black wires and wired my 2 but boiler wont fire when i turn room stat up??