Draining combi system

[AndyBill]

hi,
can someone tell me what these type of valves on my rads are ?
i want to drain my combi system but dont have any rad drains on by the looks.

i have a drain on my boiler, can i drain the system from the drain that is on the 22mm pipe (CH flow) ??

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Any advice will be gladly accepted,
thanks

 

[corgiman]

Why do you need to drain it?

 

[nickso]

if it works you can use the 22mm one. might be stuck closed though.

as corgi said, why do you need to drain?

 

[AndyBill]

i need to move a rad to another wall

 

[Gasman1015]

The valve in your picture is a lockshield, with a drain off.

 

[Soggy_weetabix]

Whats water gardening?

I dont have green fingers.

Oh, drain from the valve in the picture. Its a lockshield with d/o.

David

 

[gas4you]

The drain offs on the 15mm pipes are hot and cold supplies, nothing to do with the heating. As others have said drain from the valve in your pic, from all of them if they are all drops

 

[doyle]

what a pretty pic but the sparks shouldnt be so close to the pipes or wrapped round pipes and try some earth bonding too

 

[gas4you]

Didn't think it mattered other than with the gas pipe I stand to be corrected though That brings up another point, wheres the earth bonding

 

[doyle]

yeap just edited it in just beofer yer so nerrrr and im only a newby

 

[AndyBill]

what a pretty pic but the sparks shouldnt be so close to the pipes or wrapped round pipes and try some earth bonding too

should all the pipes be earth bonded?

 

[gas4you]

Yep, but the jury's still out on the prv discharge pipe

 

[AndyBill]

Yep, but the jury's still out on the prv discharge pipe

is it wrong? it was like that when we moved in.

 

[gas4you]

No, I was meaning there are different views on whether the discharge pipe should be earthed

 

[AndyBill]

there is an earth cable on the mains water pipe where the stopcock is,
if i cross bond all the pipes under the boiler together will this be sufficient?

what dia cable would i use?

and should i include the discharge pipe?

is there such a thing as 'too much earth bonding'?