What is causing water to come from overflow pipe

[Riley]

Very hard to say without seeing but if the discharge is run in 15mm it ain’t right

 

[John.g]

Even if it is piped perfectly then the TPRV will discharge water every time the cylinder heats as there is no place for the expansion volume to go in the event of a punctured E.vessel bladder or no airend air (as in this case) except that it can expand back through the cold feed?

 

[Paul Langley]

Riley - Noted and thanks. John.g - I suspect you may have hit the nail on the head. I imagine, from what has been said, that if I either turn off the boiler and let the DHW go cold or draw off a significant amount of hot water and then let the boiler reheat the cool/cold cylinder, I should see signs in the tundish of water discharging from theTPRV as the water in the cylinder expands and has nowhere to go as the airless EV is not functioning?

 

[SJB060685]

When the water is heated and there is no room for expansion (for whatever reason) then the 6bar expansion relief valve will discharge through D1 to tundish and then through D2 and out. Water should not expand back into the system through the double check valve

 

[Riley]

Hi Paul I’m going to have to stop it there mate as you are fishing for info we will not give. Sorry my friend please take the advice given before and get an engineer in with the relevant qualifications.

 

[Harvest Fields]

Surprised it went on this long mate.

 

[Riley]

Was trying to be helpful