CONTROL EQUIPMENT FOR A HEATING BOILER

Abstract: A device for adjusting the temperature supplied to the radiators in an automatic control equipment (7) of a heating boiler (1) comprises indicator means (12), such as light emit­ ting diodes, for predetermined intervals of the outdoor tem­ perature. The indicator means are arranged to be actuated by the temperature in the respective intervals. Each of the indicator means (12) is provided with an adjusting device (13), e.g. a slide potentiometer, comprising a slidable means (14), the position of which corresponds to a point of a graph of the supply temperature (tf) as a function of the outdoor temperature (tu). A variation of the position of the slidable means (14) results in a increase or decrease of the supply temperature.

Description: CONTROL EQUIPMENT FOR A HEATING BOILER The present invention relates to a device for adjusting the temperature supplied to the radiators in an automatic control equipment of a heating boiler, comprising a first sensor for sensing the outdoor temperature and a second sensor for sensing the radiator supply temperature, both sensors being connected to the control equipment which is arranged to actuate the shunt valve of the boiler, the radiator supply temperature being controlled in relation to the outdoor temperature according to a graph, the inclination of which may be altered and which may be displaced in parallel from its normal position in relation to the construction and geografic location of the house, and climatic conditions. In a heating plant, the shunt valve of the boiler which controls the supply of heat to the radiator supply line is often actuated by an automatic control equipment. This equipment is fed with signals from the connected sensors which sense the outdoor temperature, the room temperature, and the radiator supply temperature, respectively. It is common in such control that the radiator supply temperature follows a function of the outdoor temperature. This is most often assumed to be a straight line. The function of the line may be defined on the cne hand by the factor of the change of the supply temperature/the change of the outdoor temperature, i.e. the inclination of the graph, and on the other hand by the supply temperature as a function of a predetermined outdoor 0 temperature, e.g. 20 C, i.e. the parallel displacement of the graph from its normal position. The control equipment comprises two turn controls for the adjustment of these two functions: the inclination and the parallel displacement of the graph. Such an arrangement, however, may imply difficulties in case an adjustment of both controls is necessary, such as when the graph is not a straight line and when the desired room temperature is not provided at a certain outdoor temperature. Since the positions of the turn controls are not mutually independent, the consumers will have problems in performing such an adjustment. The object of the invention is therefore to provide a device by means of which these difficulties are avoided. The invention is generally characterized in that it comprises indicator means for predetermined intervals of the outdoor temperature, and said indicator means being adapted to be actuated by the temperature in the respective interval, and that an adjusting device is provided for each respective indicator means, said adjusting device comprising a slidable means, the position of which corresponds to a point on a graph of the supply temperature as a function of the outdoor temperature, a variation of the position of said slid able means causing an increase or decrease of the supply temperature. The invention will be described in more detail with reference to the accompanying drawings, in which Figure 1 illustrates the principle of automatic control of the radiator supply temperature as a function of the outdoor temperature, Figure 2 illustrates an example of a graph of the supply temperature as a function of the outdoor temperature, and Figure 3 illustrates a device for adjusting the room temperature according to the invention. Figure 1 illustrates the principle of controlling the supply temperature and thus the room temperature. The heating system comprises a heating boiler 1 and radiators 2 connected thereto via a supply line 3 and a return line 4. The lines 4 and 5 are interconnected by a shunt line and a shunt valve 5. The shunt valve is actuatable by a regulator 7 so as to admit more or less hot water through the supply line 3 to the radiators 2. A sensor 6 is connected to the supply line for sensing the temperature therein. The sensed temperature valve is transmitted to the regulator 7, and so is the value of the outdoor temperature as sensed by a sensor 8, which is connected to the regulator and located outside the house. The room temperature as sensed by a room sensor 9 is also transmitted to the regulator. In addition, a trimming device 10 for manual actuation by the consumer is connected to the regulator. As mentioned in the introduction, the supply temperature as a function of the outdoor temperature is usually assumed te be a straight line, the inclination of which is dependent on the design and geographical location of the house, the cli- mate, etc. Such a graph is shown in Figure 2. As has also been mentioned above, in spite of the automatic control, it is sometimes preferable to change the inclination k of the graph, and to move the graph in parallel from its normal postion N which can be made by means of the adjusting device 10. Figure 3 illustrates an arrangement by means of which such adjustment can be made. On the graph 11 provided on the control panel of the boiler and showing the supply temperature tf as a function of the outdoor temperature tu, indicator means 12 such as light emitting diodes are provided at predetermined intervals along the outdoor temperature axis. The light emitting diode 12 corresponding to a certain outdoor temperature is on. In the graph, a slide control 13 such as a slide potentiometer is provided parallel to the supply temperature axis adjacent each indicator means. The position of the operating means 14 of the control corresponds to a point on a line of the graph. Sliding of the potentiometer causes an increase or decrease of the room temperature. In the illustrated example, the outdoor temperature with in the region of +200C to -200C is divided in intervals of 0 10 C, each interval having one light emitting diode. The appurtenant five slide potentiometers are provided in each respective interval and parallel to the supply temperature axis. In this case, the device operates in accordance with the graph defined by the four linear portions. Outside the shown 0 0 interval of +20 C to -20 C the control takes place in accor- dance with the respective extrapolated graph. If the consumer considers the room temperature to be improper, all he has to do is to observe which light emitting diode that is on and to actuate the corresponding potentiometer to a warmer or coider position. By means of the above described arrangement it is thus possible for the consumer to adjust the roo- verks E1-GV to the preferred level in a simple and rapid manner.

Claims: CLAIMS 1. Device for adjusting the temperature supplied to the radiators in an automatic control equipment of a heating boiler (1), comprising a first sensor (8) for sensing the outdoor temperature, and a second sensor (6) for sensing the radiator supply temperature, both sensors being connected to the control equipment which is arranged to actuate the shunt valve (5) of the boiler (1), the radiator supply temperature being controlled in relation to the outdoor temperature according to a graph the inclination of which may be altered and which may be displaced in parallel from its normal position in relation to the construction and geografic location of the house, and climatic conditions, characterized in that it comprises indicator means (12) for predetermined intervals of the outdoor temperature (tu), and said indicator means being adapted to be actuated by the temperature in the respective interval, and that an adjusting device (13) is provided for each respective indicator means, said adjusting device comprising a slidable means (14) the position of which corresponds to a point on a graph of the supply temperature (tf) as a function of the outdoor temperature (tu), a variation of the position of said slidable means (14) causing an increase or decrease of the supply temperature (tf). 2. Device according to claim 1, characterized in that the indicator means (12) are arranged along the outdoor temperature axis in the supply-outdoor temperature graph, and that the adjusting devices (13) of the respective indicator means are arranged parallel to the supply temperature axis. 3. Device according to claim 2, characterized in that the indicator means (12) comprise light emitting diodes. 4. Device according to claim 2, characterized in that the adjusting devices (13) comprise slide potentoreters.

Inventors: NILSSON, GORAN, Nilsson, Göran 
Applicants: CTC PARCA AB
Application year: 1984
Main classification: F24H9
IPC codes: F24D19, G05D23