problems after removing radiator & replacing the smaller

[lancer]

Hi I removed a large radiator in my kitchen & replaced a smaller one in the kitchen with it after draining the system
I cut the pipes to the large radiator & blanked the pipes off I then extended the pipe using a straight to enable me to fit the large rad in place of the small one
I refilled the system ,bled the rads,but the replaced rad is cold as is one in the living room the other is ok, bedrooms are ok, toilet ok, hall ok,
what i am wondering is should I have looped the pipes rather then blanking them?
Help please

 

[seco services]

 

[pompeyal]

A few possibilities,

1) The kithen and living room radiators may have been set up on a radial circuit..ie. in one out the same, in another out another and so on. If this is the case then yes you should have looped your capped pipes.

2) Was the radiator removed in the kitchen back to back with the one in the living room? If so you may have cut the radiator out of the system that may have been feeding the 2 which now do not work. So again you would have to loop the pipes you had capped.

QUESTION Has there been occasions where you have turned of any of the three radiators in the past and has affected any of the others?

 

[lancer]

QUESTION Has there been occasions where you have turned of any of the three radiators in the past and has affected any of the others?

No I havent turned off any of these rads before

1) The kithen and living room radiators may have been set up on a radial circuit..ie. in one out the same, in another out another and so on. If this is the case then yes you should have looped your capped pipes.

2) Was the radiator removed in the kitchen back to back with the one in the living room? If so you may have cut the radiator out of the system that may have been feeding the 2 which now do not work. So again you would have to loop the pipes you had capped.

The pipes I blanked off certainly seem to run towards the living room radiator so I am guessing that I would need to loop them instead of the blanking off

Thanks I will give that a try at the weekend & post the results on here hopefully it will work

 

[JayJay1978]

Could just be airlock, is it a pressurised system (combi/system boiler), or open vented?

Do the cold rads have drain offs on them?, if not crack open the unions and let some water through untill the water gets hot then tighten back up.

More info on sytem please, boiler, pipe size - microbore?

 

[lancer]

is it a pressurised system (combi/system boiler), or open vented?
More info on sytem please, boiler, pipe size - microbore?

Must be open vented ...not combi boiler... header tank in roof space,firebird oil boiler can also use open fire with back boiler if that helps
pipe size 10mm
dont know what you mean by microbore sorry
No drain offs on rads