I've recently moved into a new flat which has radiators with TRVs and a
single digital thermostat controlling the boiler in the hallway. The
TRVs are the Drayton RT212 lockshield & push and fit packs (cheapy
ones). Every TRV in the house is set at the maximum, 6, and the
alledged sensitivity range is up to 29C. However, all of them cut the
flow off at around 20C meaning that I cannot maintain a temperature
above this in the flat (I'd ideally like 22C).

It is not a problem with the system as if I remove the TRVs completely
in say the living room, opening the flow up fully to the radiators
there, within 30 mins the temperate is up to 23C and climbing.

So, my question- is this normal? I would have expected even cheapy TRVs
set at 6 to basically keep the flow open. If not, what is wrong? they
are all installed exactly the same way and when I remove any of them I
see no additional possibily for adjustment on the head besides the
twist setting.

I should note that they are all fitted upright rather than
perpendicular to the radiators, I understand that this makes them over
sense the temperature- but should they really be cutting out at 20C?

thanks in advance!

David

has brought this to us :
I should note that they are all fitted upright rather than
perpendicular to the radiators, I understand that this makes them over
sense the temperature- but should they really be cutting out at 20C?

Could you pack the outer fixing ring up a bit, to increase the
temperature range?

--

Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk

On 14 Dec 2006 11:24:39 -0800, wrote:

I've recently moved into a new flat which has radiators with TRVs and a
single digital thermostat controlling the boiler in the hallway. The
TRVs are the Drayton RT212 lockshield & push and fit packs (cheapy
ones). Every TRV in the house is set at the maximum, 6, and the
alledged sensitivity range is up to 29C. However, all of them cut the
flow off at around 20C meaning that I cannot maintain a temperature
above this in the flat (I'd ideally like 22C).

It is not a problem with the system as if I remove the TRVs completely
in say the living room, opening the flow up fully to the radiators
there, within 30 mins the temperate is up to 23C and climbing.

So, my question- is this normal? I would have expected even cheapy TRVs
set at 6 to basically keep the flow open. If not, what is wrong? they
are all installed exactly the same way and when I remove any of them I
see no additional possibily for adjustment on the head besides the
twist setting.

I should note that they are all fitted upright rather than
perpendicular to the radiators, I understand that this makes them over
sense the temperature- but should they really be cutting out at 20C?

thanks in advance!

David

Wickes normally have bins of TRV heads in for about £5 each. Go buy a
couple and replace the old ones and see if it makes a difference.
Cheap valves may need replacing every 5 years when they cease to
function.