Kettling when on hot water only

[Bonedry]

I changed my cylinder recently which was a success, eventually. However I seem to have a problem with the boiler getting noisy when heating HW only.

There appears to be two valves on the HW circuit which I fiddled with during another problem (I know I should have left them alone). What do they do one appears to be a gate valve which can only be operated with a spanner and one has a brass tube (lock shield?) around the spindle.

What is their function and is there a way of setting them up.

Thanks for any advice

Regards

John

 

[corgiman]

the one with the the brass tube is a balancing valve for the cylinder, its meant to stop the rads going cold while you heat up the cylinder

no idea what the gatevalve is for a pic may help

did you bleed the pipes going into the cylinder?

is the balancing valve open?

 

[spudkey]

i would guess one valve is on return from the cylinder for balancing flow through the coil other maybe a bypass if these valves are throttled down too much you will not get min flow rate through boiler hence ketteling & possible overheat

 

[Bonedry]

Thanks for the replies

Hopefully this is a picture, click on it for a larger image.



If it works something else I've learnt.

So the problem may be they are not open enough? Presumably they is an issue if they are too far open.

Cheers

John

 

[corgiman]

Right

the one on the 22mm is the cylinder balancing valve, open it up

the one on the 15mm pipe is the bypass valve, make sure it is open half way




can you post a pic slightly higher than this one, say of where the flow pipe goes into the cylinder

 

[Bonedry]

Thanks corgiman

Here are some more pictures:-



and



Cheers


John