vokera linea looseing pressure

[sawadee]

cheked safety valve ok but expantion vessel seems to be loosing pressure could this cause the main boiler to loose pressure

 

[possum_jenkins]

pretty unclear what your saying here?

is water drippng from the discharge pipework?

 

[sawadee]

what i should have said was is it possible that if the expantion vessael is continually loosing pressure it will cause the main boiler to loose pressure

 

[spacethegas]

are you saying the shrader valve is leaking ?

 

[sawadee]

no the expantion vessel can be repressureised by using a car foot pump but this needs doing often alli want to know is can this effect the boiler pressure

 

[spacethegas]

if the expansion vessel looses its charge the system pressure will initially rise.

when it reaches roughly 3 bar the prv will open & the system pressure will drop.

 

[sawadee]

how would i drain the boiler to check if the pipe from the expansion vessel was blocked

 

[spacethegas]

i am not particularly familiar with this specific appliance, but in general..

isolate the boiler & check that it in fact is isolated.

isolate boiler flow & returns (not always recommended, as they may leak).

drain the boiler from a drain point at the bottom of the boiler.

open any high point vent on the boiler (if this is within the combustion chamber you are unable to do this & will need an rgi).

 

[gas4you]

See this other current post on this subject. //www.diynot.com/forums/viewtopic.php?t=42581

DO NOT use the isolating valves on these boilers, they WILL leak and cost about £30-£40 each to replace

 

[twgas]

if you've not drained the boiler you cant have repressurised the expansion vessel - properly.

 

[tonybhoy]

See this other current post on this subject. //www.diynot.com/forums/viewtopic.php?t=42581

DO NOT use the isolating valves on these boilers, they WILL leak and cost about £30-£40 each to replace

Seriously,£40 each?

 

[spacethegas]

it would not surprise me at all.