Losing pressure in potterton lynx 2

[JLD1]

Hi

Potterton Lynx 2 losing pressure.

My thoughts are: - a leak in the system
- Pressure vessel not charged
-possibly water passing through the filling loop and then increasing system pressure activating PRV.

I realise filling loop should be disconnected.

Not too experienced with boilers, but have some knowledge of them.

Any advice appreciated. Plus also does anybody know of a rule of thumb for the pressure of the expansion vessel.ie how much pressure?

Thanks
Jd

 

[corgiman]

does the pressure go up during operation? does the pressure relief pipe drip

if not it aint your expansion vessel

 

[JLD1]

Yes pressure goes up and prv drips.

ANY IDEA WHAT PRESSURE THE VESSEL SHOULD BE SET AT?

Cheers
JD

 

[urbanspaceman]

1 bar with a footpump