[格力空调维修] 第9章-E2故障和E4故障-第1节-E2故障单元电路

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第1节 E2故障单元电路

E2是蒸发器防冻结保护代码。空调器工作在制冷或抽湿模式下,压缩机运行6min后, CPU通过室内管温传感器检测蒸发器温度,如连续3min≤-5℃时,CPU控制压缩机和室外风机停机,室内风机继续运行,指示灯闪烁并显示E2,不屏蔽按键;当蒸发器温度≥6℃时,且压缩机停机已超过3min,指示灯灭,显示屏恢复正常显示,整机按原状态运行。

一、工作原理

室内管温传感器电路原理图见图9-1,实物图见9-2,室内管温传感器(25℃/10kΩ)温度阻值与CPU引脚电压(分压电阻9.1kΩ)的对应关系见表9-1。

室内管温传感器检测孔直接焊接在蒸发器管壁,探头安装在检测孔内,直接检测蒸发器温度。柜式空调器室内管温传器电路工作原理和挂式空调器传感器电路相同(见第4章第4节第三部分内容),即传感器和下偏置电阻组成分压电路,传感器温度变化时其分压点电压也相应变化,CPU通过计算分压点电压得出蒸发器的实际温度,从而对空调器电控系统进行控制。

表9-1 管温传感器与CPU引脚电压的对应关系

表9-1 管温传感器与CPU引脚电压的对应关系

图9-1 室内管温传感器电路原理图

图9-1 室内管温传感器电路原理图

图9-2 室内管温传感器电路实物图

图9-2 室内管温传感器电路实物图

二、检修流程

方法1.

查看三通阀状态(见图9-3)

三通阀结霜说明回气管(粗管)温度过凉,通常为制冷系统或通风系统故障。

三通阀结露基本上说明通风系统正常,通常为电控系统故障。

方法2.

用手感觉室内风出风口风量(见图9-4)

风量大说明通风系统正常,通常为电控系统(即传感器电路)故障。

风量小通风系统故障,通常为过滤网脏堵、室内风机转速慢、蒸发器脏堵等。

图9-3 查看三通阀状态

图9-3 查看三通阀状态

图9-4 感觉室内机出风口风量

图9-4 感觉室内机出风口风量

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