Three-pipe air conditioner and fault diagnosis method thereof

Abstract

The invention discloses a three-pipe air conditioner and a fault diagnosis method thereof. The fault diagnosis method comprises the steps that the judgment condition is selected according to an operation mode of the air conditioner, wherein the judgment condition of a refrigerating mode is that the temperature of an outlet of an evaporator is larger than the sum of the average value of all the temperatures of the outlet of the evaporator and a first preset valve, and the judgment condition of a heating mode is that the temperature of the middle of the evaporator is smaller than the difference between the average value of all the temperatures of the middle of the evaporator and a second preset valve; according to the selected judgment condition, whether the judgment condition is met or not is confirmed; when the judgment condition is met, a currently-used electromagnetic valve is powered on and powered off repeatedly at intervals of the preset time, and whether the judgment condition is met or not is confirmed again according to the judgment condition; when the result of the judgment step executed again is that the judgment condition is not met, an impurity filth blockage fault is confirmed; and when the result of the judgment step executed again is that the judgment condition is met, a non-impurity filth blockage fault is confirmed. An efficient fault diagnosis mode is provided, and maintenance personnel can clear the fault rapidly and conveniently.

Description

technical field [0001] The invention relates to the field of air conditioners, in particular to a three-pipe air conditioner and a fault diagnosis method thereof. Background technique [0002] The three-pipe air conditioner is a heat recovery air conditioner that can realize simultaneous cooling and heating functions. When the cooling and / or heating effect of the indoor unit of the three-pipe air conditioner becomes poor or even ineffective, it will seriously affect the comfort of the user. The reason for the poor performance of the indoor unit may be impurities mixed in the pipeline, or the quality of the solenoid valve, etc., but currently there is no effective fault diagnosis method, so that the maintenance personnel can find the fault location in time and confirm the use effect of the indoor unit. Bad reason. Contents of the invention [0003] The main purpose of the present invention is to provide a three-pipe air conditioner and its fault diagnosis method, aiming t...

AI Technical Summary

Problems solved by technology

When the cooling and / or heating effect of the indoor unit of the three-pipe air conditioner becomes poor or even ineffective, it will seriously affect the comfort of the user

The reason for the poor performance of the indoor unit may be impurities mixed in the pipeline, or the quality of the solenoid valve, etc., but currently there is no effective fault diagnosis method, so that the maintenance personnel can find the fault location in time and confirm the use effect of the indoor unit. poor reason

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