JPH04198653A - Abnormal state displaying device in air conditioner - Google Patents

Abstract

PURPOSE:To display a troubled location when a temperature sensor is troubled by a method wherein a temperature measuring circuit for taking temperature data from a plurality of temperature sensors is provided, an upper limit value and a lower limit value having predetermined temperature data are compared with each other. CONSTITUTION:In the event that any one of a room temperature thermistor 9, a blowing temperature thermistor 10, a refrigerant heat exchanger temperature thermistor 11 and a hot water heat exchanger temperature thermistor 12 has a short-circuit or a cutting as a trouble and a temperature can not be measured accurately, this abnormal state is detected by a sensor abnormal state sensing means 22. An abnormal state is transmitted to an air conditioner operation determining means 15, operations of an outdoor device 14 and a boiler 5 are stopped. With such an arrangement, safe state is assured and at the same time an operating LED 19 and a timer LED 20 are lit with an LED displaying order determining means 23 under a different illumination pattern in response to the kind of abnormal states for every specified illumination intervals 41 and the abnormal states are displayed, so that the troubled location can be rapidly judged.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an abnormality display device for an air conditioner.

Conventional technology In recent years, air conditioners have been equipped with microcomputers in their control parts to provide more comfortable air conditioning, and temperature sensors such as room temperature sensors, outlet temperature sensors, and heat exchanger temperature sensors have been used to detect air conditioners. It calculates multiple temperatures to determine the operating state, and for example, changes the operating frequency of the compressor or the rotation speed of the indoor fan motor.
Nowadays, the driving motor of the wind direction vane is operated to perform operational control such as changing the blown air angle.

As the control of air conditioners has become more sophisticated as described above, it has become difficult to identify the failure location during repair and maintenance. For example, when there is a failure in a moving part such as a fan motor, it is relatively easy to find the failure location, but it is difficult to find the failure location in the control part or part of the sensor.

In conventional air conditioners, there is a short circuit in the temperature sensor or
If a failure such as a disconnection occurs, the microcomputer cannot determine the operating status, so for safety reasons the control program stops the air conditioner. It did not have a function to display the

Problems to be Solved by the Invention As described above, conventional air conditioners do not have a function to display which sensor has failed when a malfunction such as a short circuit or disconnection occurs in the temperature sensor. Repairs were time consuming because the parts other than the sensor had to be checked, and the failure location could not be determined.As a result, we replaced the entire control board and found that the cause was simply a disconnected temperature sensor connector. However, there was a problem in that there was a tendency for a lot of unnecessary work to be done during maintenance.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an abnormality display device for an air conditioner that displays a failure status when a temperature sensor fails.

Means for Solving the Problems In order to solve this problem, the present invention provides a temperature measurement circuit that takes in temperature data from a plurality of temperature sensors, compares the temperature data with preset upper and lower limit values, and compares the temperature data with preset upper and lower limit values. An abnormality detection means that determines that there is an abnormality when the temperature data is not between the upper limit value and the lower limit value; an LED drive circuit that blinks an LED when the abnormality detection means determines that the temperature data is abnormal; LE depending on the type of
An abnormality display device for an air conditioner is provided with an LED display order determining means for determining and outputting a display pattern of D.

Effect With this configuration, if any of the multiple temperature sensors fails, the temperature data from that temperature sensor will deviate from the preset upper and lower limit values, so the abnormality detection means In addition, the LED display order determining means determines the display/turn according to the type of the failed temperature sensor and outputs it to the LED drive circuit.
This causes the ED to blink.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is a block diagram of a hot water heating type air conditioner showing an embodiment of the present invention. Inside an indoor unit 1, a refrigerant heat exchanger 2 and a hot water heat exchanger 3 are provided. An outdoor unit 4 as a cooling heat source and a boiler 5 as a heating heat source are connected by piping 6, respectively, and heat exchange with air in the direction of arrow 8 circulated by a fan motor 7 for cooling or heating. There are four types of temperature sensors: a room temperature thermistor 9 at the air intake port of the indoor unit 1;
However, a blowout temperature thermistor 10 is installed at the air outlet, and a refrigerant heat exchanger temperature thermistor 11 is installed at the refrigerant heat exchanger 2.
However, the hot water heat exchanger 3 is provided with a hot water heat exchanger temperature thermistor 12, and the temperature data of the four types of thermistors are inputted to the control device 13 as resistance values.

The control device 13 includes a temperature measuring circuit 14 that inputs and measures temperature data of the four types of thermistors, and an air conditioner operation determining means 1 that determines the operating state based on the measured temperature data.
5, and a fan motor drive circuit 16 that drives the fan motor 7, a boiler control circuit 17 that outputs an operation command to the boiler 5, and an outdoor unit control that outputs an operation command to the outdoor unit 4 based on the determined operation state. The operation of the indoor unit 1 is controlled by a circuit 18, an LED drive circuit 21 for driving an operation LED 19 for indicating that the operation is stopped, and a timer LED 20 for indicating whether or not the timer operation is in progress. The control device 13 also includes a sensor abnormality detection means 22 that determines whether the four types of temperature data input to the temperature measurement circuit 14 are within the normal value range, and a sensor abnormality detection means 22 that determines whether or not the four types of temperature data input to the temperature measurement circuit 14 are within the normal value range. LED display order determining means 23 is provided for determining the blinking order of the LED 19 and the timer LED 20.

In the above configuration, when all four types of temperature data are within the normal value range, the air conditioner operation determining means 15 controls the fan motor 7, the outdoor unit 4, the boiler 5, and the operation LED 19.
, the timer LED 20 is operated as appropriate to perform cooling or heating operation, but if even one of the four types of temperature data is out of the normal value range, a sensor abnormality is detected via the temperature measurement circuit 14. The means 22 detects this and notifies it to the air conditioner operation determining means 15 to stop the operation of the boiler 5 or the outdoor 114, and also detects the room temperature thermistor 9, the Suita temperature thermistor 10, and the refrigerant temperature via the sensor abnormality detection means 22. Heat exchanger temperature thermistor 1
1. Tell the LED display order determining means 23 which temperature data of the hot water heat exchanger temperature thermistor 12 is out of the normal value range, and the LED display order determining means controls the operation LED 19 and the timer in a predetermined blinking pattern. A command is issued to the LED drive circuit to drive the LED 20.

FIG. 2 shows an example of a specific circuit of the main part. Control device 1
3 is composed of a microcomputer 24 and peripheral circuits. Room temperature thermistor 9, outlet temperature thermistor 1
0, the resistance values of the refrigerant heat exchanger temperature thermistor 11 and the hot water heat exchanger temperature thermistor 12 are converted into voltage values by the temperature measurement circuit 14 constituted by a reference resistor 25 and a capacitor 26, and are input to the microcomputer 24. be done. The microcomputer 24 is programmed with an air conditioner operation determining means 15, a sensor abnormality detecting means 22, and an LED display determining means 23. The LED drive circuit 21 is composed of a transistor 27, and amplifies the output from the microcomputer 24 to drive the LED.
D19 and timer LED 20 are driven.

The operation of the sensor abnormality detection means 22 will be explained using the flowchart of FIG. 3, taking the case of the room temperature thermistor 9 as an example. The resistance value of the room temperature thermistor 9 is converted into a voltage by the temperature measurement circuit 14, and the input temperature detected by the microcomputer 24 is th.The upper limit of the room temperature is 60°C and the lower limit is -10°C. shall be. slap 28
In step 29, th is compared with the upper limit value, and in step 29, th is compared with the lower limit value, and if th is lower than the upper limit value and larger than the lower limit value, it is determined to be normal 30, and th exceeds the upper limit value. If it is below the lower limit value, it is judged as abnormal. Similarly, in the case of the detection temperature th2 of the blowout temperature thermistor, the detection temperature th3 of the refrigerant heat exchanger temperature thermistor 11, and the detection temperature th4 of the hot water heat exchanger thermistor 12, the upper and lower limit values set in advance are set in advance. It compares it to determine whether it is normal or not.

Next, the operation of the LED display order determining means will be explained using the flowchart of FIG. 4 and the time chart of FIG. 5.

In FIG. 4, at slap 32, the room temperature thermistor 9 is
Detected temperature th.

If it is abnormal, the operation LED 19 and timer LED 20 are blinked according to a preset abnormality display pattern 1.33. Similarly, in steps 34, 35, and 36, th
2, determine whether th3, th4 are normal or not, and if abnormal, abnormal display pattern 2, 37, same pattern 3, 38,
The operation LED 19 and timer LED 20 are blinked according to the same pattern 4.39. th th2, th3, t
h4, if everything is normal, the operation LED and timer LED are normally displayed according to the determination by the air conditioner operation determination means 15.
0.

The time chart in FIG. 5 shows an example of an abnormality display pattern. The horizontal axis represents time, and the vertical axis represents blinking of the LED with ON and OFF. As explained in the flowchart of FIG. 4, when the temperature th detected by the room temperature thermistor 9 is abnormal, the operation LED 19 and the timer LED 20 blink according to the abnormality display patterns 1 and 33. If the blinking interval time 41 is 10 seconds, the LED lighting time is 42.
is 1 second, and the LED dot interval 43 is 1 second, and in abnormal display pattern 1.33, the blinking interval 41 is 1 second.
At first, the operation LED is turned on for 42 seconds for 1 second every 0 seconds, and the timer LED remains off. Abnormal display pattern 2
, 37, on the other hand, the timer LED 20 is turned on 42 times per second at every blinking interval 41, and the operation LED 19 remains off. In abnormal display pattern 3.38, the operation LED 19 is turned on for 1 second every 41 flashing intervals.
The timer LED 20 is turned on 42 times for 1 second with a lighting interval of 4301 seconds.

In abnormality display patterns 4 and 39, on the other hand, the timer LED 20 is first lit 42 times for 1 second at each blinking interval 41, and the operation LED is turned on 42 times for 1 second after a 1-second interval of lighting interval 43, thereby displaying an abnormality. Set a pattern.

According to the configuration of the above embodiment, the room temperature thermistor 9, the blowout temperature thermistor 10, and the refrigerant heat exchanger temperature thermistor 11.
, there is an abnormality such as a short circuit or disconnection in one of the hot water heat exchanger temperature thermistors 12, and the temperature cannot be measured accurately (
In this case, the sensor abnormality detecting means 22 detects the abnormality, and the air conditioner operation determining means 15 detects the abnormality.
In addition to stopping the operation of the outdoor unit 4 and boiler 5 to ensure safety, the LED display order determining means 23 causes the operation LD 19 and timer LED 20 to blink differently at fixed blinking intervals 41 depending on the type of abnormality. It lights up in a pattern to indicate an abnormality, so you can quickly determine the location of the failure.

Effects of the Invention As is clear from the description of the embodiments described above, the present invention is capable of controlling the operation LED by controlling the sensor abnormality detection means and the LED display order determining means when various temperature sensors used in the air conditioner fail. , we constructed an abnormality display device that displays abnormal locations by creating various abnormal display patterns by using display parts that display normal operation, such as timer LEDs, so it is possible to This has the effect that it can be quickly determined whether the temperature sensor has failed, that repair is easy, and that repair does not require a large amount of time.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an air conditioner-like abnormality display device showing an embodiment of the present invention, Fig. 2 is a circuit diagram of a control device of the abnormality display device, and Fig. 3 is an abnormality of the temperature sensor of the abnormality display device. Flowchart showing an example of a program for determination, No. 4
The figure is a flowchart showing an example of a program for determining the pattern of the abnormality display device, and FIG. 5 is a time chart showing an example of the pattern of the abnormality display device. 14...Temperature measurement circuit, 21...LE
D drive circuit, 22...Sensor abnormality detection means,
23...LED display order determining means. Name of agent: Patent attorney Akira Koebushi, and two others Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] A temperature measurement circuit that takes in temperature data from multiple temperature sensors, compares the temperature data with preset upper and lower limits, and determines that there is an abnormality if the temperature data is not between the upper and lower limits. an abnormality detection means for
An LED drive circuit that lights up an LED when the abnormality detection means determines that there is an abnormality, and an LED display order determining means that determines and outputs a display pattern of the LEDs according to the type of abnormality in the LED drive circuit. Abnormality display device for harmonizer.