Ideal classic

[Westy]

Got a gravity feed hot water with sealed ch system which keeps building pressure since I changed to rads.
changed expansion vessel to a 12 lt made no difference.
pump working and 3 port working
if it was the vessel the pressure would drop and over flow the feed and expansion tank on the hot water.
any ideas ppl cheers westy

 

[lame plumber]

what did you have before rads were installed?????????????????????????????????????, when you changed to rads

 

[Westy]

What did I have ?
i changed 2 rads that's all

 

[Mike Jackson]

Filling loop letting by?

 

[Westy]

Nope disconnected it and turn the water supply off

 

[stoker122]

Is it getting enough to unseat the PRV?

 

[Westy]

Yep 3bar plus

 

[Rickster123]

Can you show us a pic of the new vessel and pipework?

 

[anz]

Leaky coil?

 

[Rickster123]

Leaky coil?

That would have the opposite effect tho wouldn't it?

 

[anz]

That would have the opposite effect tho wouldn't it?

Yeah, your right, the hot water's at a lower pressure.

 

[Rickster123]

What are you filling the system to when cold?

 

[Westy]

1 bar

 

[Dotty]

What pressure do you have in your ev?

 

[bewsh]

How many radiators are connected to the system?

So when you turn the c/h off, and everything cools down, does the pressure drop down to near zero? Or does it constantly stay up at 3 bar?

 

[Westy]

1.6 bar on ev
the pressure does not go down a lot about 0.2 bar
7 rads

 

[bewsh]

1.6bar air pressure in the expansion vessel? Did you check that with the system pressure drained off? Seems quite high for the air side, but if the water pressure was high it would give you a false air pressure reading.

Does the pressure increase when the heating is turned off?

 

[Westy]

The pressure is set by the manufacturer as it is new

 

[bewsh]

So, does the pressure increase when the heating is off?

 

[stoker122]

Is possible 1.6 bar air pressure is too high and not allowing the diaphragm to compress. Try setting at 0.9 bar and see what happens.

 

[Ollieg]

Flexi hose to expansion vessel blocked?
I think they have one.

 

[Westy]

Hose not blocked as its a 22 mm pipe to
will try dropping the pressure

 

[Ollieg]

Ahh, thought you has a classic with the vessel on top of it.

 

[Westy]

No the vessel is external