第5节 压缩机排气温度传感器分压电阻开路,压缩机不运行
故障说明
海信KFR-26GW/27FZBPE挂式直流变频空调器,用户反映不制冷,检查室外风机运行,但压缩机不运行,取下室外机外壳,观察室外机主板LED1亮、LED2和LED3灭,查看故障代码含义为“压缩机排气温度传感器故障”;按压遥控器上“高效”键4次,室内机显示屏显示代码为“02”,含义仍为“压缩机排气温度传感器故障”,说明室外机主板传感器电路出现故障。图4-21所示为室外机传感器电路原理图。
图4-21 海信KFR-26GW/27FZBPE室外机传感器电路原理图
1.测量传感器电路电压
如图4-22所示,使用万用表直流电压挡,黑表笔接室外机主板直流5V电压地,红表笔接传感器插座测量电压,此时室外环温约35℃。
图4-22 测量室外机传感器插座电压
测量室外环温传感器(OUTDOOR)黄色插座CN09,供电电压(①处)为直流5V,分压点电压(②处)为直流2.7V,判断室外环温传感器分压电路正常。
测量室外管温传感器(COIL)黑色插座CN08,供电电压(③处)为直流5V,分压点电压(④处)为直流2.6V,判断室外管温传感器分压电路正常。
测量压缩机排气温度传感器(COMP)白色插座CN07,供电电压(⑤处)为直流5V,分压点电压(⑥处)也为直流5V,说明压缩机排气温度传感器分压电路出现故障。
说明:此机未设压缩机顶盖温度开关,因此室外机主板上的相应插座为空。
2.测量压缩机排气温度传感器阻值
如图4-23所示,拔下压缩机排气温度传感器插头,使用万用表电阻挡测量插头阻值,实测阻值约为37kΩ,判断传感器阻值正常,应检查分压电阻阻值。
图4-23 测量压缩机排气温度传感器阻值
说明:压缩机排气温度传感器规格25℃/65kΩ。
3.测量压缩机排气温度传感器分压电阻阻值
如图4-24所示,此机分压电阻使用贴片形式,安装在室外机主板背面,因此断开空调器电源,待开关电源停止工作后,取下室外机主板,使用万用表电阻挡,测量分压电阻R15阻值,正常阻值为6.8kΩ,实测阻值为无穷大,说明开路损坏。
图4-24 测量压缩机排气温度传感器分压电阻阻值
4.压缩机排气温度传感器分压电阻
如图4-25所示,R15为贴片电阻,表面数字682,表示阻值为6.8kΩ。由于没有相同阻值的贴片电阻,选用阻值相同的五环精密电阻代换。
图4-25 6.8kΩ贴片电阻和精密电阻
维修措施
使用五环精密电阻(6.8kΩ)代换贴片电阻R15,如图4-26所示。
图4-26 更换压缩机排气温度传感器分压电阻
如图4-27所示,安装室外机主板引线,再将空调器通上电源并使用遥控器开机,使用万用表直流电压挡测量压缩机排气温度传感器插座分压点(⑥处)电压,室外机未运行时待机电压为直流0.8V(此时阻值为37kΩ),室外风机运行后约15s压缩机开始运行,空调器开始制冷,随着压缩机的运行,排气管温度也逐渐升高,排气温度传感器阻值也逐渐下降,因此分压点电压逐渐上升,运行约7min后,分压点电压稳定,实测为直流2.53V。此时拔下压缩机排气温度传感器插头,使用万用表电阻挡测量阻值约为6.8kΩ。
图4-27 测量室外机传感器插座电压
资料
压缩机排气温度传感器电路
压缩机排气温度传感器参数通常为25℃/65kΩ,而分压电阻阻值随机型不同也不相同,如海信早期空调器分压电阻阻值为20kΩ(海信KFR-26GW/11BP等机型),目前空调器分压电阻阻值为6.8kΩ,实物图如图4-28所示。早期和目前的空调器在相同温度下分压点电压即CPU引脚电压也不相同,因此在维修时需要注意。压缩机排气温度传感器温度、阻值、不同阻值的分压点电压见表4-1。
表4-1 压缩机排气温度传感器温度、阻值、电压对应关系
图4-28 压缩机排气温度传感器分压电阻阻值
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