第1节 室内管温传感器阻值变小,室外机无供电
故障说明
海信KFR-26GW/77VZBP挂式直流变频空调器,用户反映前一天制冷正常,现忽然不制冷。图4-1所示为室内机传感器电路原理图。
图4-1 海信KFR-26GW/77VZBP室内机传感器电路原理图
1.测量接线端子交流电压
遥控开机,室内机显示屏显示室内温度和室外温度,但频率显示条处为空,即一格也没有。如图4-2所示,使用万用表交流电压挡,在室外机接线端子上测量1号L相线和2号N零线电压为交流0V,在室内机接线端子上测量时电压也为交流0V,正常值应为交流220V,判断室内机主板未向室外机输出供电。
图4-2 测量室外机和室内机接线端子上交流220V电压
2.测量传感器电路电压
按压遥控器上“传感器切换”键6次,室内机显示屏显示“房子图标11”,即室内机故障编号为11的代码,查看代码本上没有编号为11的故障。
断开空调器电源,待1min后再次上电,室内机主板CPU复位,遥控开机后,导风板打开,室内风机运行,但未听到主控继电器触点闭合的声音,频率条处一直为空格,显示室内温度正常,显示室外温度为“--”,即检测不到室外机的温度,判断故障点在室内机。
如图4-3所示,使用万用表直流电压挡,黑表笔接室内机主板7805中间引脚地,测量室内机环温和管温传感器插座电压,此时室内温度约为29℃。
图4-3 测量室内机主板环温和管温传感器插座电压
测量室内环温传感器(ROOM)红色插座CN6,供电电压(①处)为直流5V,分压点电压(②处)为直流2.6V,判断室内环温传感器分压电路正常。
测量室内管温传感器(COIL)白色插座CN3,供电电压(③处)为直流5V,分压点电压(④处)为直流4.1V,判断室内管温传感器分压电路出现故障。
3.测量环温和管温传感器阻值
如图4-4所示,拔下室内环温和室内管温传感器插头,使用万用表电阻挡测量阻值,实测管温传感器阻值约为1kΩ,环温传感器阻值为4.2kΩ,根据测量结果判断管温传感器阻值变小损坏。
图4-4 测量室内机环温和管温传感器阻值
维修措施
更换25℃/5kΩ管温传感器,如图4-5所示。更换后上电开机,室内机主控继电器触点吸合,此时未显示频率条,待通信电路正常后,同时显示1格频率条和室外环温,室外机开始运行,频率条也逐渐上升至4格,制冷恢复正常,故障排除。
图4-5 更换室内机管温传器后测量分压点电压
总结
海信77系列变频空调器维修资料如下所述。
①室内机显示屏可同时显示压缩机频率条、室内环温、室外环温,如图4-6所示。
图4-6 海信77系列变频空调器显示屏
②海信大多数变频空调器可根据显示屏显示的室外环温来判断通信电路是否工作正常,原理为只有通信电路正常工作,室内机CPU处理后才能驱动显示屏显示室外环温。
③室内机主板CPU带有记忆功能,刚开机时显示的室外温度不是实时温度,而是上一次关机时的记忆值,因此此系列空调器凭室外温度判断通信电路是否正常容易误判;可将空调器电源插头拔下,待1min后再通上电源,室内机CPU复位后再开机确定。
④如果室外环温传感器开路,室内机显示屏显示室外温度处为“-19℃”。
⑤故障代码显示方法:按压遥控器上“传感器切换”键6次,室内机显示屏才能显示故障代码,注意不是按压遥控器“高效”键。
⑥显示故障代码时,显示屏分2组显示,即室内机故障和室外机故障。如果为室内机故障,显示屏上“房子图标”和代码编号同时闪约6s;如果为室外机故障,显示屏上“大树图标”和代码编号同时闪约6s。
⑦如果拔下室外机环温、管温、压缩机排气温度3个传感器,显示屏为“大树图标”和编号93同时闪动,但故障代码本上没有“室外机93”的故障,这表明此系列空调器显示故障代码不是很准确。
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