Potterton Perfroma 24 Pressure /Heating Issues

[badflaw]

Hello . I have a Potterton Performa 24 in the house I have recently moved into.

The pressure during CH was rising rapidly , dumping through PRV then dropping. I googeld for symptoms the internal expansion vessel and water came out.

Ive fitted an 8ltr external expansion vessel to the heating return line close to the boiler. I then bled and balanced radiators as per advice on the net.

The heating worked , some radiators very hot some cold. bled and balanced again- all hot.

about 12 hours later i noticed pressure had raised gradually and room temp dropping..
today ive had to drain pressure regularily and the radiators arent getting very warm.. probably as boiler cutting out..
I purchased a new PRV th same time as the expansion vessel as the old one had been firing a million times an hour .I haven't fitted it yet as I heard they can be damaged after one use and i wanted to check the fault had dissapeared first. Though Im wondering could the old prv be causing this current issue.


PS boiler doesn't have any external controls eg room theromostat

Im an industrial maintenance technician so have good electrical/mechanical fault finding understanding ..though Im no gas engineer!

Thanks in advance..

 

[Barry98]

you sure its not something like the filling loop passing

 

[Puddle]

as said disconnect filling lop to make sure not passing,if still rises possible plate heat exchanger split

was water in system black or clear when you drained

As you just moved into property problem could have been on going and system corroded,was there any brown staining under pr pipework outside

 

[Billy Bob Bob]

for a start 8 ltr is a bit on the small side for a performa would have gone with 10 myself as said check filling loop not passing if that checks out ok you either have a undersized vessel or a pinholed plate heat exchanger

 

[badflaw]

Thanks for the,reply . There,was,some .copper residue /silt at bottom when I draim from bolier vdrain valve in manifold.how do I,rectify issues this causes. How do I diagnos leaking plate exchanger please

 

[Puddle]

Thanks for the,reply . There,was,some .copper residue /silt at bottom when I draim from bolier vdrain valve in manifold.how do I,rectify issues this causes. How do I diagnos leaking plate exchanger please

if it turns out to be plate,you will have to replace it

 

[badflaw]

Thankyou but how do I prove /disprove the olate exchanger. Is this the dhw echanger or burner one. Also what does the copper residue indicate ....

 

[badflaw]

ps yes there was brown staining outside from prv valve....