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R452 - Thermostatic head with liquid sensor
Technical data
In modern society research concerning comfort in the home becomes a factor of prime importance. In order to obtain comfort in an home, numerous problems could occur, i.e. temperature control indifferent rooms according to their use. It is important that the client can decide the optimal temperatures of the rooms where he works or lives, in order to obtain more energy savings. In order to obtain these results, temperature setting systems are require to exploit the system potential, i.e. through the free energy contributions. During the day thermal charges in the different rooms of a home could occur changing in accordance with different factors such as a sudden variation of the outside temperature, internal free energy contributions due to the presence of people, electric equipment, sun radiation coming from windows. In such situations an automatic setting device, i.e. a thermostatic head installed on the radiator avoids the over temperature effect. This occurs because the radiator of that room is excluded from the system, and consequently the room is not heated, while in the other rooms of the home energy are served.

Operation is easy: room temperature change arouses a consequent volume variation of the liquid contained in the sensor of the thermostatic head. This volume variation allows the transfer of an internal mechanism with a consequent closure or opening of the valve and thus with a modulation of the water flow coming into the heating body. When in a room the required temperature has been reached, the head closes the valve progressively, leaving the minimum amount of water to pass and maintaining a constant room temperature, with a consequent energy saving. Giacomini R452 thermostatic heads have temperature settings with very high precision obtaining different room temperatures according to individual requirements: 20° dining-room, 16° in bedroom, 19° in kitchen, 24° in bathroom. The law of the 9 January 1991, n° 10 carried out with the a departmental order n.°412 of the 26th of August 1993, in the article 7 paragraph 7 requires the use of devices for automatic setting of the temperature in the different rooms. Among the various methods, heads with thermostatic operation are surely the most reliable, economic and simple to be installed and used.

In order to obtain the right setting position of the R452, please refer to the following table combining the numeration reported on the handle to the corresponding room temperatures carried out in a thermostatic room with a heating body in optimal functioning conditions. When the radiator is installed in positions where water stagnation or cold draught are present, the calibration temperature does not correspond to the middle room temperature because the sensor of the head is influenced by localised activity, and thus it makes the valve close before or it does not close it at all. In those cases it is necessary to proceed with successive resets of the handle position using a mercury thermometer to be positioned in the middle of the room. E.g.: if the head is in 3 position and the room temperature is under the foreseen 20°C with the setting system, this is due to a premature closing of the valve caused by localised activity. In this case it is necessary to lightly rotate the handle to the intermediate position between the numbers 3 and 4. Vice versa when the head is in the 3 position and the temperature is up to the foreseen 20°C, the sensor is effected by a cold draught and consequently the valve remains open. In this case the handle must be rotated to the intermediate position between number 2 and 3. If the room where the thermostatic head is installed is not used, it is possible to obtain maximum energy savings by rotating the handle in the position *, corresponding to the anti-freeze protection temperature 8°C.During summer time it is recommended to position the handle in the max. opening position

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