vokera flowmatic pressure at 3 water pouring out?

pressure drops when boiler cools and the escaping excess pressure is flowing outside. The flow to outside should stop when the boiler pressure drops to 3 bar. or there abouts.

however pop your heating back on and within a couple mins it'll be doing the same again as the system temp rises causing the system water to expand thus increasing pressure over 3 bar again triggering prv to open and protect the boiler.

let boiler cool, see what pressure is sitting at. ideally when system is cold you should have around 1 - 1.5 bar then during normal system expansion it should not really go over that cool setting plus a bar ie 1 bar cold to 2 bar hot. even that is a bit much of a rise but within tolerence.

to lower pressure use a container in a room where you dont have white carpets, tiled floor good place just in case and open a radiator bleed screw and catch the water. do that for a little bit and stop and go to check pressure reading. repeat til around 1 1/4 bar

hope thats as clear as mud, not the best at explaining things :)

ste
December 2009