Unvented radiator loop gaining pressure

[Cooop]

A couple of issues that I found with my heating system recently, water coming from the overflow outside led me to investigate the system and found the following....

The potable vessel on the cold water feed was full of water, bladder had gone so that was replaced with an inflation of 3.0 bar. The 6 bar cold feed safety valve leaks hense the water outside when the boiler is on (water or rads), replacement arrived and will be fitted soon.

I also fitted a pressure gauge to ensure the pressure reducer was doing its job. Pressure at a little over 3 bar so I need to raise the pressure in the potable vessel a little stop the 'boost' we get from the hot water while it deflates when the tap is opened.

At the same time I checked the pressure gauge at the hot side pressure vessel, it was reading 2.5bar so I drained the rad loop to checked the pressure in the vessel, no pressure present so I inflated that to just over 1 bar. Repressured the loop up to one bar and have let it settle over a couple of heating cycles over the last few days.

I appear to be gaining about .25 bar a day on the pressure gauge of the hot side vessel, any pointers?

 

[Dan Robinson]

Filling loop

 

[Cooop]

Do you mean the feed to the hot vessel to re-pressurise it to 1 bar? I have have had the braided pipes off as I thought it was one of the stop valve leaking but no sign of leaks.