Draining Combi Boiler Central Heating

[wildchild]

It got a BIASI RIVA compact combi boiler. How do i got about drainig the central heating system? Does it just involve just closing the C.H Flow and return pipe and draining the radiators? or do i have to open the drain cock in boiler too?

Also i am planning of installing TRVs do i need to change anything in boiler for installing them?

 

[ollski]

Is it just the heating circuit you are draining?, if so its a hosepipe on the radiator drain valve and then opening one of the highest rad bleed screws when the pressure is released to let the air in and hence remaining water out

 

[wildchild]

yes it just the heating circuit, i want to replace the rads valves. Does that mean i dont have to close the Flow and Return pipe on the boiler?

 

[ollski]

God yes, don't touch them for anything. You will probably find that you need to leave one radiator with no trv on by the way.

 

[wildchild]

Thank you sir never tried this before so hope i dont get me house flooded