TRV Isolation

[Doug99]

Hi All
I'm looking to temporarily remove a radiator to decorate the room.
The rad has a standard valve on the left and a TRV on the right.
I aim to remove the rad and leave the isolating valves on the pipework.
The left hand valve will close fully, but the TRV has 3, 2,1,* settings.
If I set the TRV to *, will it full isolate the supply?
I assume if the room temp drops significantly, the valve will open. So how do I fully close the TRV?
Cheers
Doug

 

[pcaouolte]

Remove the TRV head and replace it with a decorators cap. https://www.screwfix.com/p/drayton-radiator-valve-cap-white-5-pack/5649r

As a backup you can also fit a blanking nut with a rubber seal after you remove the radiator.

 

[SithLordHood]

Does the TRV not go further round past the * setting? Modern ones have a full off position.

 

[Doug99]

I've now removed 2 radiators in preparation for the rooms to be skimmed.
I've refilled and bled the remaining rads, but on running up the CH a downstairs rad refuses to heat up.
I've bled the radiator but it refuses to heat up.
I would not expect the removal of rads would affect it.
For info, the cold rad is the one I used to drain the system.
Ant thoughts why it wont heat up?
Cheers
Doug

 

[pcaouolte]

Ant thoughts why it wont heat up?

Has the pin which is operated by the TRV head stuck in the down (closed) position?

 

[terryplumb]

If both valves are definitely open , close every other rads TRV ,see if problem rad now heats up.

 

[Doug99]

Has the pin which is operated by the TRV head stuck in the down (closed) position?

Pin is serviceable with full movement.
My daughter has said the rads have been 'gurgling' which suggests there is still air in the system.
I'll bleed the rads again and shut down a couple to see if my cold rad heats up.
Cheeers
Doug

 

[ChrisJP]

Remove the TRV head and replace it with a decorators cap. https://www.screwfix.com/p/drayton-radiator-valve-cap-white-5-pack/5649r

As a backup you can also fit a blanking nut with a rubber seal after you remove the radiator.

TRVs used to be supplied complete with decorators caps, but I guess this was stopped by the bean counters trying to save few pence per unit

 

[Doug99]

I've fitted blanking plugs to the valves and sods law now decrees that the weather is turning cold whilst we await the plasterer to do his job.