[变频空调维修]-第4章-传感器电路故障-第3节-室内管温传感器阻值变小,室外机不运行

技术支持评论2,393字数 1808阅读6分1秒阅读模式

空调培训资料缩略图

第3节 室内管温传感器阻值变小,室外机不运行

故障说明

海信KFR-45LW/39BP柜式变频空调器先前由同事维修,遥控开机后室外风机和压缩机均不运行,检查室外机主板直流300V、12V、5V电压均正常,判断室外机主板损坏,如图4-12所示。经更换后故障依旧,又判断为室内机主板故障,在更换时邀请笔者一起去用户家维修。

图4-12 更换室外机主板和室内机主板

图4-12 更换室外机主板和室内机主板

1.测量接线端子电压

上门检查,取下室内机进风格栅,短接门开关引线,在更换室内机主板前测量室内机的关键点电压。

如图4-13左图所示,使用万用表交流电压挡,遥控开机后测量室内机接线端子1号L相线和2号N零线电压为交流220V,说明室内机主板已向室外机供电。

如图4-13右图所示,将挡位换为直流电压挡,黑表笔接2号N零线,红表笔接4号通信SI线,测量通信电压,开机后为0-24V正常跳动变化的直流电压,判断室外机主板CPU工作正常,且通信电路也工作正常。

图4-13 测量室内机接线端子交流220V电压和通信电压

图4-13 测量室内机接线端子交流220V电压和通信电压

2.测量传感器电路电压

如图4-14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,红表笔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30℃。

测量室内环温传感器(ROOM)红色插座CN11,供电电压(①处)为直流5V,分压点电压(②处)为直流2.7V;测量室内管温传感器(COIL)黑色插座CN12,供电电压(③处)为直流5V,分压点电压(④处)为直流4.7V。同一温度下环温分压点和管温分压点电压相差约2V,初步判断室内管温传感器分压电路出现故障。

图4-14 测量室内机主板环温和管温传感器插座电压

图4-14 测量室内机主板环温和管温传感器插座电压

3.测量传感器阻值

如图4-15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为357Ω,环温传感器阻值约为4kΩ,管温传感器阻值正常时应和环温传感器相等,约为5kΩ,根据测量结果判断管温传感器阻值变小损坏。

图4-15 测量室内机环温和管温传感器阻值

图4-15 测量室内机环温和管温传感器阻值

维修措施

更换管温传感器,如图4-16所示。由于管温传感器安装在蒸发器管壁上面,需要取下室内机上面板和蒸发器挡板才能更换,应急试机可将待更换的管温传感器探头插在室内外机联机管道中粗管(回气管)保温套之中,并使探头紧靠粗管。

图4-16 更换室内机管温传感器

图4-16 更换室内机管温传感器

总结

①定频空调器管温传感器阻值变大或变小损坏,通常表现为室内机主板不向室外机供电。如果输出交流电压,压缩机和室外风机运行,系统就开始制冷,由于传感器损坏不能正确检测蒸发器温度,会导致系统进入不正常的状态。

②变频空调器室内机和室外机均设有电控系统,主板CPU通过通信电路传送信号,即使室内机出现故障,如室内管温传感器损坏,室内机主板向室外机供电后,将温度信号和控制命令经通信电路传送至室外机CPU,可控制压缩机和室外风机均不运行。

③海信目前的变频空调器室外机主板或模块板故障代码指示灯为3个,可以显示室内机的故障代码,因此室内机出现故障(如传感器电路或室内风机损坏),均能在室外机显示,所以室内机出现故障时通常可以向室外机供电。

④海信早期变频空调器室外机故障代码指示灯通常只有1个,不能显示室内机的故障代码,当室内机出现故障时,通常不向室外机供电,和定频空调器基本相同。

⑤从本例也可以看出,即使元器件出现相同的故障,不同时期的电控系统表现出的故障现象也不一样,在维修时需要注意。

⑥最后,希望大家记住,变频空调器管温传感器损坏时,室内机主板有可能输出室外机的交流220V供电,不要以为室内机主板输出供电就代表室内机没有故障。


Warning: file_exists(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads/2024/03) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2036

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads/2024) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads/avatar) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-content/themes/begin/inc/avatar-cache.php on line 7

Warning: file_exists(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads/avatar) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2036

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_file(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads/avatar/b32f9e95aaf5f958e5327dc1538e4e1c96.png) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-content/themes/begin/inc/avatar-cache.php on line 21

Warning: is_file(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads/avatar/b32f9e95aaf5f958e5327dc1538e4e1c-d.png) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-content/themes/begin/inc/avatar-cache.php on line 22

Warning: fopen(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads/avatar/b32f9e95aaf5f958e5327dc1538e4e1c-d.png) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-content/themes/begin/inc/avatar-cache.php on line 26

Warning: fopen(/www/wwwroot/www.yxjdzl.com/wp-content/uploads/avatar/b32f9e95aaf5f958e5327dc1538e4e1c-d.png): Failed to open stream: Operation not permitted in /www/wwwroot/yxjdzl.com/wp-content/themes/begin/inc/avatar-cache.php on line 26

Fatal error: Uncaught TypeError: fclose(): Argument #1 ($stream) must be of type resource, bool given in /www/wwwroot/yxjdzl.com/wp-content/themes/begin/inc/avatar-cache.php:27 Stack trace: #0 /www/wwwroot/yxjdzl.com/wp-content/themes/begin/inc/avatar-cache.php(27): fclose() #1 /www/wwwroot/yxjdzl.com/wp-content/themes/begin/template/copyright.php(21): begin_avatar() #2 /www/wwwroot/yxjdzl.com/wp-includes/template.php(772): require('...') #3 /www/wwwroot/yxjdzl.com/wp-includes/template.php(716): load_template() #4 /www/wwwroot/yxjdzl.com/wp-includes/general-template.php(204): locate_template() #5 /www/wwwroot/yxjdzl.com/wp-content/themes/begin/single-default.php(16): get_template_part() #6 /www/wwwroot/yxjdzl.com/wp-includes/template.php(772): require('...') #7 /www/wwwroot/yxjdzl.com/wp-includes/template.php(716): load_template() #8 /www/wwwroot/yxjdzl.com/wp-includes/general-template.php(204): locate_template() #9 /www/wwwroot/yxjdzl.com/wp-content/themes/begin/single.php(6): get_template_part() #10 /www/wwwroot/yxjdzl.com/wp-includes/template-loader.php(106): include('...') #11 /www/wwwroot/yxjdzl.com/wp-blog-header.php(19): require_once('...') #12 /www/wwwroot/yxjdzl.com/index.php(17): require('...') #13 {main} thrown in /www/wwwroot/yxjdzl.com/wp-content/themes/begin/inc/avatar-cache.php on line 27
WordPress › 错误