Draining central Heating system

[Anton]

I cracked a nut on the microbore pipe leading to a rad' and need to drain the system. I don't know how to do it, can anyone advise?

It's an Ariston Genus combi. No water tanks anywhere, mains fed.
I am greeted with this array of pipes underneath the boiler but don't know what's what.

Once isolated, how do I proceed from there?

Many thanks in advance.

 

[masona]

You should have a drain point somewhere near the radiator,if not shut down the lowest radiator,remove the radiator and you can fit a washing machine hose connector to the radiator valve and drain it outside or into bucket which you can operated the valve.Don't forget to do both side of valve,long job I know but then you can fit a bleed valve wherever you want for next time.

 

[Anton]

Thanks masona. The plumber used push fit connections. I managed to unscrew them on one rad and I thought this would drain the system, however it didn't, the rad that I need to isolate hsa push connections but the don't unscrew. Is it a case of pulling these apart or not?

Both rads are downstairs.

 

[masona]

Probably a airlock,undo the bleed valve on the radiator first then see what happen.

 

[MANDATE]

'Push connections' need a 'purpose made' tool to release the grip of the serated teeth that holds the pipe firmly.
Whoever sells the connections will also sell the tool

 

[COG]

CANT YOU REMOVE THE OFENDING RAD AS DESCRBED?, YOU HAVE A SEALD SYSTEMSO ONCE YOU HAVE THE PRESSURE DOWN,SAY WITH THAT FIRST RAD YOU DID THE THE SECOND SHOULD BE OK IT MAY BE DROP FED ie HAVE ITS PIPES COMEING DOWN DIRCT FROM THE FIRST FLOOR IF SO THE RAD WILL STILL BE FULL OF WATER TO BE DRAIND OFF