l just bought an empty flat, where the water was turned off and the electric too
ive turned the electric on but when l turned the water on the direct unvented water heater ( a tribune range he ) fills but the then the water comes out of the overflow ( tundish ) until l turn the water off at the main
is there anything that l should be doing once the water has been turned off and the system drained please.
all the taps around the flat work ok when the water is turned on l havn't tried to switch the 2 immersions on at all l need help please
Sounds like one of two possibilities[1] - either the pressure reducing valve is not working correctly and you have very high mains pressure water, or an overpressure release valve is opening when it should not (or is stuck open due to debris lodged in it).
Typically there is a PRV on the mains inlet to limit the pressure to around 3 - 3.5 bar. There are two over pressure relief valves. One is a combined over temperature and over pressure valve (usually on the side of the cylinder toward the top), and the other is a overpressure / expansion relief valve - typically built into the Pressure reduction valve. Both valves should feed via pipes to the tundish. Both relief vales usually have a red knob on the top, which should turn a short distance to open the valve manually and then spring back to the closed position when you let go. I would try operating both a couple of times manually to make sure there are doing what they should.
[1] The third possibility would only really apply as the cylinder heats up - and that would be if the expansion vessel has lost its charge of air meaning there is no expansion space and that forces the pressure to rise to high.
the water on /after the system being drained down by the foreclosure company, the water tank isn't filling ,As ,as soon as the water flows out of the tundish and l turn the water supply off then there is no water at the taps ( forsetts ) or at the shower so the cylinder isn't filling/ how do l fill the cylinder once the water supply is turned on ? l think l have to open a valve to get the tank to fill but im not sure which valve to open/ the 2 valves which you mention./ l have tried and all that seems to happen is a surge of water goes through the tundish when l turn each valve/ l don't think there is anything wrong with the system but l don't know how to refill the water tank / any help would be gratefully accepeted/ l should re adjust my question and do a new one and cancel the original one regards from the UK/ best wishes Peter
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