Thermostatic Radiator Valves

[played]

I have Oventrop DG TRV's fitted to my radiators (all but one). Should they be fitted to the supply side, or the return? The arrow is in the correct direction, as they are fitted to the supply side.The radiators are hot at the top and warm at the bottom. Does this mean it is closing before the hot water is filling the radiator, due to being on the supply side?
Please help.

 

[LUNAT]

HI

depends on the design.
most TRVs are reversible which means they can be fitted to either side of the radiator.

 

[gasandoilman]

Most are reversible lunat said but its best to put on flow side as it makes balancing the system easier

If your return pipe is cool but flow hot you may have air in your pipes.
Does the bottom stay warm all the time even when first coming on?
If so try turning off all rads exept the one concerned and see if it clears air lock

 

[played]

Thanks for the replies, I will try turning the radiators off one at at time and see if I can get the radiators to go hot. If not I think I might just take the trv's off.

 

[GasMan1965]

Best shut all rads off and leave the 1 effected on so the pump concentrates on the faulty 1 ,, also you can turn your pump up to help but turn it back down when sorted... \also colder rads @ the bottom can be sludge and blockage

 

[twgas]

if your rooms are reaching temp (which you dont appear to have indicated one way or the other) then TRVs are working fine. and I always fit them on flow.