Santon Unvented System - hot water to tundish

da3533 · Sep 25, 2014

Hello Everyone,

This has been happening for time now, well, since i bought the flat which was back last month. When ever the cylinder is fired, after around 10mins of boiling, the tun dish frequently drops water in a flow not drops, then later stops. After which, there is no further hot water from the taps.

I then checked the pressure on the vessel, even pushed the pin up and there is no air! I will be pumping it up today but As i can remember, the vessel should be 3.5bar air right or? and can i pump it without stopping the main supply of water?

Thanks
Dean

Ermintrude · Sep 25, 2014

You MUST be g3 qualified. Your probably going to do it any way

AWheating · Sep 25, 2014

get it recharged at the same time as its annual safety check is done, then you will know its safe to use and if theres any other problems.

da3533 · Sep 26, 2014

ok thanks.

So far, i have found this:

when i check the pressure without any taps running etc, it is 0bar. However, when i use the tap water or flush the toilet, i re-check the pressure and its gained pressure to 2.3bar.
is this normal? i thought it should have 3.5bar at all times regardless..

thanks.

tomplumb83 · Sep 27, 2014

You MUST be G3 qualified

plumben · Sep 27, 2014

id strongly advised you get your G3 Qualified engineer to service/repair your system, as faulty operation can lead to injury or death

also no qualified person on this forum will provide you with details on how to carry out repairs that you SHOULD NOT be doing

da3533 · Sep 29, 2014

plumben said:
id strongly advised you get your G3 Qualified engineer to service/repair your system, as faulty operation can lead to injury or death

also no qualified person on this forum will provide you with details on how to carry out repairs that you SHOULD NOT be doing

yes, i have read about how dangerous it can be to be honest. So thanks for the info, it is not worth it.

Ok, i will call in a G3 qualified engineer. However, i want to be able to have a good knowledge just in-case he states facts that is not true. Last time i called someone to check my gas boiler in my other house, he suggested to replace the whole system etc...

in a brief note, what is my problem? hot water flowing through the tundish.. tpv could be faulty, vessel has no pressure?
According to my understanding in science of the way this works, if the vessel has no or less pressure it will throw out cold water... if the system throws out hot water, it could even be the temperature stat for the cylinder, over heats the water... i just hope they dont rip me off.