TRVs

[twinkydrip]

I know this is basic for most of you out there but can you please advise me as to why when I turn the TRVs in the bedrooms in my house to zero or the frost sign there is maximum output of heat from the radiators!! How can I turn the heat off on these radiators? Are all these TRVs faulty or does the system need balancing? Please help.

 

[aggis]

Trvs are faulty, prob the head has gone, some makes you can get just a replacement head, but prob cheaper getting & fitting complete trv.

 

[Toddyplumb]

They arn't just loose on the valve body are they ?
Faulty TRV usually will not give any heat !

 

[aggis]

Faulty TRV usually will not give any heat !

If wax cartridge in trv head gone , won't shut it off.

 

[Toddyplumb]

Yes , Ok if it has burst , I agree . I have never seen one go that way but OK

Just as an add on ; many years ago we were commisioning a system 8 trvs . We normally flush etc with the heads off and fit the heads at the end with nice clean hands .
One of the lads had put all the heads on top of a double convected rad for safe keeping Every head had overextended its capsule , 8 new Trvs required !! They dont like sitting on top of a rad at 80 deg

 

[fuzzy]

trvs dont turn off, they just go to cold, but if the rooms cold?? guess what they turn on. they are not on and off valves

 

[Toddyplumb]

Of course they turn off . Past frost protection (then sometimes past the stop) to off . Its down that far that the capsule is inoperative
Granted that is not how they operate in normal use , but they have an off.

 

[Scottley]

British gas ones have an off but all the ones i have come across need the special cap put on to turn them off completely

 

[Gray0689]

Of course they turn off . Past frost protection (then sometimes past the stop) to off . Its down that far that the capsule is inoperative
Granted that is not how they operate in normal use , but they have an off.

Yes I Agree with this

 

[tamz]

British gas ones have an off but all the ones i have come across need the special cap put on to turn them off completely

Most of the decent ones have a positive off.