Draining heating system

[scottpetrie]

Hi
Im about to remove/replace a TRV on my bathroom radiator and shorten the pipe. Correct me if Im wrong but would this be the best way to drain my system.
Close all TRV’s and lockshields on all radiators.
Switch off heating so it doesnt come on.
Open drain point and hopefully this should just drain pipework and not radiators, reducing chance of airlock.
Replace pipework/TRV and install new radiator, filling with inhibitor.
Close drain point, open up all radiators, and open fill loop until pressure is back up.
Bleed radiators.

Thanks

 

[Bonni]

Yes. If the bathroom rad is upstairs, you won't have to drain much out as downstairs pipes don't need to be fully drained.

 

[scottpetrie]

Okay thanks. Its a bungalow so am guessing will need to drain it all anyway

 

[Bodd]

Hi
Im about to remove/replace a TRV on my bathroom radiator and shorten the pipe. Correct me if Im wrong but would this be the best way to drain my system.
Close all TRV’s and lockshields on all radiators.
Switch off heating so it doesnt come on.
Open drain point and hopefully this should just drain pipework and not radiators, reducing chance of airlock.
Replace pipework/TRV and install new radiator, filling with inhibitor.
Close drain point, open up all radiators, and open fill loop until pressure is back up.
Bleed radiators.

Thanks

Doing it that way could increase the chances of getting an air lock.