BRV Bonetti Rubinetterie Valduggia S.r.l.

The first operation performed by the valve is to take a 'reading' of the existing room temperature. A sensor fitted up  inside the adjustment knob is able to increase or reduce proportionally the rise or fall in temperature, recording even slight variations. It controls the valve working by closing or opening the valve lock. This system allows the complete exploitation of the heat produced independently from other heat sources such as the sun, other household electrical appliances, light sources and even the body heat emitted by people in the room. Therefore, the temperature set remains constant as the diagram below clearly shows.
 

  

Setting the required temperature is extremely simple. Turn the knob to coincide with the required value marked by the indicator. You must turn the selector switch clockwise to reduce the temperature and anticlockwise to increase it. The selector, which is marked with numbers 1-5, enables the reading of the value corresponding to the temperature set by means of the indicator. To enable maximum output both in terms of comfort and energy savings, the plumbing system should have devices suitable for Termostar working. The most important is a differential valve to restrict rises in pressure or a self-adjusting circulating pump; the use of a temperature delivery regulator that is sensitive to the various external temperatures is also recommended.
 

The sensor inside the knob reacts to the surrounding room temperature. For this reason the thermostatic valve should not be installed behind curtains, covers, forniture or in a niche. Direct exposure to sunlight or draughts is also to be avoided. The valve is supplied with a cap to protect it from damages during fitting and it also serves as manual control. The valve flow rate can be adjusted by turning the protection cap. 1K temperature variation corresponds to 52.8° cap rotation (2K=7 prominences). Installation should be carried out in accordance with the direction of the flow indicated on the valve body. However, the thermostatic head should be fitted in horizontal position, never vertically. Fitting of the thermostatic head can be facilitated by turning the knob to the maximum opening level (pos. 5) and making the four raised parts on the head coincide with the four notches on the valve body, and then screwing down the locknut.

Termostar requires no preventive service. However, replacement of the termostatic Kv-cartridge nut (in accordance with EN 215 requirements) may be necessary and it is sold as a spare part with relative O-ring.
 

Dimensions

 

Technical Features

Head losses in the fixed model:
 
 

c	[ J / kg K ]	SPECIFIC HEAT: The amount of heat that 1 kilo of mass should yield so that the temperature will be reduced by 1K (For water the value is 4200).
∆p	[ kPa ]	DIFFERENTIAL PRESSURE: The pressure difference existing at the valve ends.
∆t	[ K ]	DIFFERENTIAL TEMPERATURE: The temperature difference between the radiator entry and exit.
K	[ K ]	PROPORTIONAL BAND: The difference in temperature between the set value and the heat sensitive element value.
kv	[ m3 / h ]	FLOW COEFFICIENT: Flow rate in m3/h for a pressure drop across the valve of 1 bar.
Q	[ W ]	NOMINAL POWER: The radiator's heating power in working conditions.
qm	[ kg / h ]	FLOW RATE: The valve's flow rate with a determined differential pressure.
a		AUTHORITY The ratio between the headloss of the thermostatic valve and the total headloss of the whole: valve+radiator+lockshield valve

    

Approximate ambient temperature