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Arrangement, in a weather-dependent advance controller of temperature of a heating installation, for facilitating adjustment of controller characteristics to heating characteristics
| Details |
Inventors: Reiner, Eugen;
Assignee: Aktiengesellschaft Adolph Saurer (CH)
Primary Examiner: Wayner; William E.
Assistant Examiner:
Attorney, Agent or Firm: McGlew and Tuttle
The arrangement comprises a Wheatstone bridge to which an operating potential is applied and whose diagonal is connected to a differential amplifier controlling a final control element for the temperature of the heating medium. One half of the bridge is constituted by a potentiometer, adjustable to effect parallel shifting of the controller characteristic curve, relating the outside temperature to the advance heating temperature of the heating medium, connected at a first junction point to a temperature sensitive resistor subjected to the temperature of the heating medium. The other half of the bridge is constituted by a first arm comprising a temperature sensitive resistor subjected to the outside temperature connected at a second junction point to a fixed resistor, and a second arm comprising two further fixed resistors connected to each other at a third junction point. An adjustable voltage divider is connected between the second and third junction points, and comprises a series connection of a second potentiometer and a limiting resistor. The adjustable tap of the second potentiometer is connected through a third potentiometer to the third junction point and is also connected to one input terminal of a threshold value switch whose other terminal is connected to the third junction point. The adjustable tap of the third potentiometer is connected to one input of the differential amplifier and the other input of the differential amplifier is connected to the first junction point. The second potentiometer is operable to adjust the slope of the controller characteristic curve in accordance with a preselected outside temperature, and the third potentiometer is adjustable in accordance with a selected advance temperature. The output of the threshold value switch is used to provide an indication as to whether, in case of an erroneous adjustment, the first potentiometer is to be used to effect a parallel shift of the curve or the second potentiometer is to be used to adjust the slope of the curve. |
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DETAILED DESCRIPTION The objective of the present invention is the elimination of the mentioned drawbacks or disadvantages of the known arrangements and, for this purpose, the present invention is directed to an arrangement of the kind mentioned above permitting selecting the setting members for a correct adjustment and actuating them in a simple manner while, at the same time, substantially avoiding errors in recognition and adjustment.
In accordance with the invention, there is provided an electric value which is produced in a modified bridge circuit and is equivalent, as a decision value, to an outside temperature which is optimal for the respective climatic range and determining for the selection of the setting member to be actuated.
This electric value is used to identify the setting member to be actuated.
The identification may be effected either by a simple optical indication or by a mechanical blocking of one of the two setting members, or also by an alternate coupling of the respective more expedient setting member to a single actuating member.
This results in an additional advantage of an extremely simple operation, and, in practice, to a complete elimination of errors.
An object of the invention is to provide an improved arrangement for facilitating the adjustment of the control characteristics of an advance controller in a weather-dependent advance controller of temperature of a heating installation.
Another object of the invention is to provide such an arrangement which avoids the disadvantages of known arrangements and permits selecting the setting member for a correct adjustment and to actuate the same in a simple manner.
A further object of the invention is to provide such an arrangement in which errors in recognition and adjustment of the setting members are substantially avoided.
For an understanding of the principles of the invention, reference is made to the following description of typical embodiments thereof as illustrated in the accompanying drawings.
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