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The valve is extremely accurate and quiet when controlling to a set poin=
t temperature in normal operation. Because the valve measures the temperatu=
re every minute using it's two temperature probes it is very accurate at me=
asuring the temperature in the room. The valve has =
1,000 steps between the fully closed position and fully open, so it can adjust the amount of water coming into the radiator to a very high =
degree of accuracy, giving it unparalleled control of the heat=
ing in the room.
When a valve is first mounted on a radiator it has to 'learn' the on posit=
ion, so it can work efficiently and react faster in the future. When it is =
in this 'learning mode', each time the valve is called to heat a room it st=
arts to control the temperature by opening 5 of the 1,000 steps, it then wa=
its to see if it can sense any hot water flowing through the valve body (th=
e metal part that the water flows through), and then after another 60 secon=
ds it opens another 5 steps etc.
When mounted on the flow side of the radiator it will normally have esta= blished the 'on' position of the valve after about 30-45 minutes, it will s= tore this in its memory and will then control as normal to allow the radiat= or to warm up.
Next time it opens it remembers the position that it needs to go to and = immediately starts to control around that point.
In the case of it being on the out flow of the radiator, it may reach th= e 'on' position, but because the water is flowing into the other end of the= radiator it will not sense a temperature change, because of this it will c= ontinue on the 5 steps routine for much longer. After the first week the va= lve will have eventually worked out the correct 'on' position but it will t= ake much longer for it to do this in this case.
To work out what side of the radiator is the in-flow and what is t= he outflow you can purchase magnetic radiator thermometers, or you can simp= ly use your hands (WARNING: the radiators may be very hot = to touch). The warmer end of the radiator nearest the valve/pipe is the inf= low end and the cooler end of the radiator is the outflow end.
You can stop a valve from learning if you simply press any button on the= valve whilst it is trying to warm up the room. In this case, the valve aba= ndons the learning for that time and will wait until the next time it is ca= lled to heat a room before it tries to learn again.
Don't forget that if you ever put a valve into 'mount mode' again = then it does not know if you have taken it off and put it on a different ra= diator so it will start it's weeks learning again.