The method of judging whether the resistance value of the temperature sensor of the multi-connected air conditioner in cooling mode has shifted

Abstract

The invention discloses a method for judging whether resistance values of temperature sensors of a multi-union air conditioner of a refrigeration mode deviate. The method includes the steps that a, the refrigeration mode operates and one indoor unit is started; b, the pressure value of an air suction port of a compressor (1) is measured, the saturation temperature pdt corresponding to the pressure value is converted, and the temperature value Te1 of an outlet of a coil pipe, the temperature value Tem of the middle of the coil pipe and the temperature value Te2 of an inlet of the coil pipe of the indoor unit are measured; c, whether two conditions are met at the same time is judged, wherein the two conditions are as follows: Te1>=Tem >=Te2 and 0<Tem-pdt<=20, if the two conditions are met at the same time, it is judged that the resistance values of the three temperature sensors of the indoor unit do not deviate, and if any one of the conditions is not met, it is judged that the resistance values of the temperature sensors of the indoor unit deviate. According to the method, the detection process is simple, quick, accurate, direct and efficient.

Description

technical field [0001] The present invention relates to a multi-connected air conditioner unit (abbreviated as a multi-connected air conditioner), specifically a method for judging whether the resistance value of a temperature sensor (temperature sensor) of a multi-connected air conditioner unit operating in cooling mode is shifted. Background technique [0002] The multi-connected air conditioner unit in the prior art includes an outdoor unit, a plurality of indoor units connected in parallel, and two refrigerant circulation main pipes connecting each indoor unit and the outdoor unit. The outdoor unit communicates with multiple indoor units connected in parallel through two refrigerant circulation main pipes. [0003] Each outdoor unit includes compressor, oil separator, four-way reversing valve, outdoor heat exchanger (condenser in cooling mode) and gas-liquid separator. The outlet of the compressor communicates with one end of the oil separator, the other end of the oil ...

AI Technical Summary

Problems solved by technology

[0007] The above three temperature sensors are equipped with resistors. Once the resistance value of the resistors changes or shifts, the measurement results will be inaccurate. The main controller of the unit will adjust the unit according to the wrong measurement results, which will inevitably lead to series of failures

Although the temperature sensor has been tested to ensure that the resistance value is accurate when it leaves the factory, after the unit has been in operation for a long time, it will be affected by the climate, such as excessive temperature difference between day and night, excessive humidity, etc., which will cause the resistance value to shift.

However, the existing technology lacks a method for specifically detecting whether the resistance value of the temperature sensor has shifted, and technicians can only check the causes of other faults one by one, and finally determine that the cause of the fault is the resistance value shift, such as external machine, internal Insufficient fan speed of the machine, blockage of the coil of the heat exchanger, insufficient heat exchange due to dust on the coil of the heat exchanger, blockage of the electronic expansion valve of the internal unit, etc.

Each technician spent a lot of time checking one by one before finally determining the cause of the failure. The detection process is cumbersome, laborious and inefficient

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