JPH0484059A - Detecting device for abnormality of temperature detecting part of air conditioner - Google Patents

Abstract

PURPOSE:To facilitate detection of abnormality of a sensor part through visual observation by a method wherein, when abnormality occurs to a sensor part, an LED is lighted ON by means of a main control part on the indoor machine side. CONSTITUTION:A sensor part 12 comprises a main control part 10, a power source 4 to apply a voltage being a reference, a thermistor 5 internal resistance of which is changed by a temperature change, and a partial pressure resistor 6 to divide temperature, detected by the thermistor 5, into proper voltages. The main control part 10 is connected to the power source 4 through the thermistor 5, and the thermistor 5 is connected to a ground through the partial pressure resistor 6. The main control part 10 inspects whether a temperature voltage conversion value obtained from the sensor part 12 is within a predetermined voltage range, and at a point of time when a temperature voltage conversion value being out of a voltage range is detected, an abnormal LED 2 is lighted ON. In this case, in the usual using state of an indoor machine, a temperature voltage conversion value obtained from the sensor part 12 is controlled so that it is prevented from being out of a predetermined voltage range.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an abnormality detection device for a temperature detection portion provided in an indoor unit of a separate air conditioner.

BACKGROUND OF THE INVENTION Conventionally, a main control section provided in an electrical section of an indoor unit uses a remote controller (hereinafter referred to as a remote control) to instruct the main 11J control section about a desired operating mode. For example, as shown in FIG. 4, the main control unit 10
It communicates with the outdoor unit 17 that exchanges heat with the outside air, describes the operating state of the outdoor unit 17, and controls the outdoor unit 17. The main control unit 10 controls the indoor blower 14 provided in the indoor unit 16 or the indoor unit based on information obtained from the remote control 15, information from the outdoor unit 17, and a sensor unit 12 that detects the indoor temperature. The lighting state of an operating light emitting diode section 13 (hereinafter referred to as an operating LED section) indicating the operating state of 16 is controlled.

Problems to be Solved by the Invention In such a conventional configuration, the indoor blower on the load side managed by the main control section, the operation LED section 13, or the main control section 1
When an abnormality occurs in the microcomputer, it is difficult to tell which part the abnormality has occurred in, and it is necessary to investigate in detail using measuring instruments, making it difficult to judge immediately. It is difficult.

That is, in the control board in the main control section 10 of the indoor unit,
The electrical equipment section supplies power to the control board, and the central processing unit (CPU) controls the indoor blower 14, which is the load of the indoor unit 16.
), the indoor blower drive circuit and other electrical components that need to be checked, and the indoor blower 14 is also included in the indoor unit, so there are many parts that need to be checked with measuring instruments ( A complicated check must be performed based on the diagram.Especially with control boards that have become more complex in recent years, the amount of work required for checking continues to increase, making it difficult to perform repair services. Furthermore, in the process of checking a complicated control board, due to the complexity of the check work, a normally normal control board is mistakenly determined to be abnormal, which results in replacing it with a new control board, resulting in unnecessary service costs. There were some issues, such as:

The present invention is intended to solve the above-mentioned conventional problems, and aims to provide a device that can easily detect abnormalities in the main control area indoors.

Means for Solving the Problems In order to solve the problems, the present invention includes an outdoor unit of an air conditioner, an indoor unit, and a main control unit that receives operating information from a remote controller and controls the indoor unit, The main control section includes a sensor section that detects indoor temperature, and an abnormality LED section that indicates an abnormality in the sensor section, and the sensor section includes a thermistor whose internal resistance value changes depending on the ambient temperature, and a thermistor that controls voltage. and a voltage dividing resistor for dividing, and a light emitting diode in the abnormal LED section.

The light emitting diode is configured to include a limiting resistor that limits the current flowing through the light emitting diode.

Operation With this configuration, the main control section receives the temperature-voltage conversion value from the sensor section in order to control the indoor unit, and the main control section determines whether the temperature-voltage conversion value is within a predetermined voltage range. As a result of the inspection, when a temperature-voltage conversion value outside the predetermined voltage is received from the sensor unit, the abnormality LED is turned on to indicate an abnormality in the sensor unit.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 to 4. Note that the same reference numerals as in the prior art indicate the same components, and the explanation will be omitted.

In FIG. 2, in addition to the conventional example shown in FIG. 4, this embodiment is constructed by newly connecting an abnormality LED section 11 that indicates an abnormality in the sensor section 12 to the main control section 10.

A configuration diagram of the abnormality LED section 11 is shown in FIG. That is, the abnormality LED unit 11 includes the main control unit 10, an abnormality LED 2 that displays an abnormality in the main control unit, a limiting resistor 3 provided to limit the current flowing through the abnormality LED 2, and the abnormality LED 2. The power supply 1 is connected to the main control section.

On the other hand, the sensor unit 12 includes the main control unit 10, a power source 4 that provides a reference voltage, a thermistor 5 whose internal resistance changes depending on temperature changes, and the thermistor 5 together with the resistance of the thermistor 5. A voltage dividing resistor 6 is provided to divide the temperature into appropriate voltages. The main control unit 10 and the power source 4 are connected via a thermistor 5,
Furthermore, the thermistor 5 is connected to ground via a voltage dividing resistor 6.

In the above configuration, the main control unit 10 inspects whether the temperature-voltage conversion value obtained from the sensor unit 12 is within a predetermined voltage range, and detects the temperature-voltage conversion value that is outside the voltage range. At this point, the abnormality LED 2 is turned on.

At this time, when the indoor unit is normally used, the sensor section 12
This ensures that the temperature-voltage conversion value obtained from the voltage does not deviate from a predetermined voltage range.

Next, in the chart shown in FIG. 3, a procedure in which the main control section 10 inspects the temperature-voltage conversion value obtained from the sensor section 12 will be shown. Here, the temperature voltage conversion value is usually 0.5v or more4
．． It is assumed that the voltage is less than 5V. Therefore, starting from START 20, which is the beginning of the inspection, temperature detection 2 is started.
1 and receives the temperature-voltage converted value from the sensor section 12. Furthermore, in voltage judgment A22, the temperature-voltage conversion value is 0.
If it is less than 5V, it is determined that an abnormal temperature-voltage conversion value has been detected, and the process proceeds to abnormal LED lighting 25 and returns to temperature detection 21 again. If the voltage is determined to be 0.5V or more in the voltage determination A22, proceed to voltage determination B. If it is 4.5V or more, it is determined that an abnormal temperature-voltage conversion value has been detected, and the abnormal LED lights up 2.
Proceed to 5. In addition, if the voltage judgment B23 is less than 4.5V, the temperature-voltage conversion value is judged to be 0.5V or more and less than 4.5V, and it is judged as normal and the abnormal LED is turned off 24.
After that, the process returns to temperature detection 21 again.

Effects of the Invention As is clear from the description of the embodiments described above, the present invention enables the main control unit to turn on abnormality LEDs in m indoor air conditioners to easily determine abnormalities in the sensor units by visual inspection. This makes repair services more efficient as abnormalities in the sensor part of the indoor unit's electrical equipment can be immediately detected.
However, it can be done accurately. Furthermore, in the process of checking a complicated control board, due to the complexity of the check work, a normally normal control board may be mistakenly determined to be abnormal, resulting in unnecessary service costs being incurred by replacing it with a new control board. This has the effect of contributing to cost reduction, such as being able to prevent problems before they occur.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram of an abnormality detection device for temperature detection part of an air conditioner according to an embodiment of the present invention, FIG. 2 is a block diagram of an abnormality detection device for temperature detection part of the air conditioner, and FIG. FIG. 4, a chart diagram according to an embodiment of the invention, is a circuit configuration diagram of a conventional temperature detection section. 1.4...Power supply, 2...Abnormal LED,
3...Limiting resistor, 5...Thermistor,
6... Voltage dividing resistor, 10... Main control section,
11...Abnormal LED section, 12...Sensor section, 16...Indoor unit, 17...Outdoor unit. Name of agent: Patent attorney Shigetaka Awano and one other person

Claims (1)

[Claims] An outdoor unit, an indoor unit, and a main control unit that receives operating information from a remote controller and controls the indoor unit,
The main control unit includes a sensor unit that detects indoor temperature and an abnormality LED unit that indicates an abnormality in the sensor unit, and the sensor unit includes a thermistor whose internal resistance value changes depending on the ambient temperature, and a voltage between the thermistor and the sensor unit. A temperature detection part abnormality detection device for an air conditioner, the abnormality LED section comprising a light emitting diode and a limiting resistor for limiting a current flowing through the light emitting diode.