例1、 故障现象: 通电后蜂鸣器不响, 显示屏无任何字符显示, 室内机与室外机都不工作。
Example 1, fault phenomenon: the buzzer does not sound after electricity, there is no display of any character on the display screen, and both indoor and outdoor machines do not work.
检测与判断:
Detection and judgment:
该空调器采用三相电源供电, 遇到这种不能起动的故障时, 一般须检查三相电源是否缺相或严重不平衡, 再检查该机三相电源是否正常。打 开 室 内 机 电 源 板 盖 , 万 用 表 测 12 V 、5 V 两 组 输 出 电 压 正 常 , 但 所 有 继 电器 不 工 作 。当 偶 然 碰 触 L E 5 38 光 耦 合 器 时 , 电 源 指 示 灯 亮 , 空 调 器 起 动 。误 以 为 由 于 L E 5 38 接 触 不良造成的,重新焊接好后,空调器工作正常。但没几天故障重新出现,再重焊LE538,也不能起动工作。于是决定采用更换LE538的办法,空调器仍不能起动。说明前两次重焊LE538,空调器能正常工作,纯属偶然,根本原因不在LE538不良。仔细分析电源板插座及引线知道,电源板的所有控制信号,全部来自显示器电路板上的微处理器。为此,试更换一只显示器,空调器仍不能起动,故障根源仍在电源板上。由于更换了显示器仍不能使空调器起动,那么只有一个可能,就是电源板没有向显示器的微处理器提供复位信号,致使微处理器工作条件不满足而未工作,由于没有控制信号输出,所以执行元件(继电器)不工作,造成整机不能起动。显示器上的5V工作电压由电源板上元件(型号C2253)提供。借助有关资料得知C2253为带复位端的+5V稳压集成元件,其引脚功能为:①脚为电源输入,②脚为复位,③脚为地,④脚为+5V电压输出。监测②脚电压始终为0V,焊下②脚外接电容器检查正常,说明C2253内部开路,无复位信号输出。
The air conditioner is powered by three phase power supply. When it comes to such a failure that can't start, it is usually necessary to check whether the three-phase power is in phase or serious imbalance, then check whether the three-phase power of the machine is normal. Open the power plate cover of the indoor machine. The output voltage of 12 V and 5 V two groups is normal, but all the relays are not working. When the L E 538 optocoupler is touched by chance, the power indicator light is bright and the air conditioner starts. It is mistaken that the air conditioner works well after re welding due to the bad contact of L E 538. But a few days of failure to re appear, re rewelding LE538, can not start work. So the decision to replace the LE538, the air conditioner can still not start. The first two times to re weld LE538, the air conditioner can work normally, it is purely accidental, the root cause is not bad in the LE538. A careful analysis of the power board socket and the lead line knows all control signals of the power board, all from the microprocessor on the display circuit board. To this end, try to replace a display, the air conditioner can still not start, the root of the fault is still on the power board. Due to the replacement of the display still can not make the air conditioner starting, so there is only one possible, is the power supply board does not provide a reset signal to the display microprocessor, the microprocessor working condition does not work, because there is no control signal output, so the implementation of components (relay) does not work, causing the whole machine can not start. The 5V operating voltage on the display is provided by the component on the power board (model C2253). According to relevant data, C2253 is an integrated +5V regulator with reset terminal. Its pin function is as follows: (1) the foot is power input, the second is reset, the third is feet, the forth is +5V voltage output. Monitoring 2 feet voltage is always 0V, under welding under the foot external capacitor check normal, indicating that the C2253 inside open, no reset signal output.
维修方法：
Maintenance methods:
因无法购到C2253,笔者试用一个100Ω电阻并接在C2253的②和④脚之间,通电后开机空调器恢复正常工作。
Unable to buy C2253, I tried a 100 - Omega resistor and connected between C2253's and 4 feet, and the air conditioner returned to normal work after electricity.
例2、格力KFR-25GW空调器制冷剂充注过量导致压缩机起动便停车
Example 2. The overcharge of the refrigerant of the GREE KFR-25GW air conditioner causes the compressor to start and stop
故障现象:
Failure phenomenon:
室内机安装在四楼,而室外机却安装在五楼房顶,制冷连接管道加装有延长管,使用不到一个月便出现不制冷。
The indoor machine is installed on the four floor, while the outdoor machine is installed on the roof of the five building. The cooling connection pipe is installed with the extension tube, which is not used for less than a month.
检测与判断:
Detection and judgment:
检查制冷管道各个连接头,室外机的液管出口处螺母有松动,拧紧后充注制冷剂。试机时,压缩机刚一起动就停车。将复合式压力表连接在系统中,观察压力,发现高压过高,高压过高是由制冷剂充入过多、系统内进入空气等原因造成的。进一步检查又发现压缩机上有浮霜,综合两种现象判定是制冷剂充注过量所致,进一步了解在安装时曾补充过制冷剂(因有延长管),但未按标准量充注(充注量过多)。
Check the connecting head of the cooling pipe. The nut at the outlet of the outdoor machine is loosened, and then the refrigerant is filled. When the machine is tested, the compressor just stops together. The compound pressure gauge is connected to the system to observe the pressure. It is found that high pressure and high pressure are caused by too much refrigerant and air into the system. Further inspection revealed that there was floating frost on the compressor. The two phenomena were caused by the over charge of refrigerants. I further understood that refrigerants were added during installation (because there was an extension tube), but they were not charged according to the standard volume.
维修方法:
Maintenance methods:
放出多余的制冷剂后,制冷系统运转正常。
After the extra refrigerants are released, the refrigeration system operates normally.
例3、格力KF-459k空调器室外机未固定导致毛细管震裂
Example 3, the unfixed outdoor unit of GREE KF-459k air conditioner causes capillary crack
故障现象:
Failure phenomenon:
不制冷,加R22制冷剂后,压力表指针明显下降。
When the R22 refrigerant is added, the pointers of the pressure gauge decrease obviously.
检测与判断:
Detection and judgment:
拆下室外机外壳,见室外机毛细管震裂,造成震断原因是,安装人员把空调器室外机直接放在地上没有固定牢,用气焊修补好断裂处,通电后压缩机不起动,由于毛细管震裂,加之用户又长时间开机,使压缩机内的冷冻油大量排出,造成压缩机过热,油膜破坏,压缩机出现抱轴。
Remove the shell of the outdoor machine, see outdoor machine capillary shattered, broken reason is caused, installation personnel of the air conditioner outdoor unit placed directly without fixed firmly on the ground, with the welding repair fault, the compressor does not start after power, because the capillary shattered, and users have long time to boot, frozen oil in the compressor, excessive discharge, caused by overheating of the compressor, oil film breakdown, compressor axle.
维修方法:
Maintenance methods:
采用加大电容法和敲击法,起动压缩机均不凑效,最后只有把压缩机高压管和低压管焊开,采用气压冲击法,压缩机才起动运转,运转10min后,从低压气体阀门加200mL冷冻油,试机正常后,再打压、检漏、抽空、加制冷剂R22,空调器恢复制冷。
By increasing the capacitance method and tapping method, start the compressor are not working, finally had to open welding tube high pressure pipe and the low pressure compressor, pneumatic impact method, compressor will start running 10min after the operation, from the low pressure gas valve 200mL oil test machine is normal, call back pressure, leak detection, time, and refrigerant R22, air conditioning refrigeration recovery.
例4、格力KFR-32GW空调器压缩机烧毁后的代换经验
Example 4, replacement experience of GREE KFR-32GW air conditioner compressor after burning
故障现象:
Failure phenomenon:
遥控器开机后,室外机组不起动。
After the remote control is opened, the outdoor unit does not start.
检测与判断:
Detection and judgment:
格力KFR-32G空调器不制冷,万用表检查确认压缩机线圈烧断。
The GREE KFR-32G air conditioner is not refrigerant, and the multimeter check confirms that the compressor coil is burned.
维修方法:
Maintenance methods:
试用一台国产庆安宇航设备公司生产的1．5P压缩机进行代换,该压缩机与原压缩机底座的安装孔完全相同。接线方法,起动电容的两根引线接压缩机的运转“M”端子,电容器的一根引线接起动“S”端子,过热、过电流保护引线接压缩机的公共“C端子”试机压缩机起动一次成功正常后,打压、抽空、加R22制冷剂,试机空调器恢复制冷。
The 1.5P compressor produced by a domestic Qing'an aerospace equipment company is replaced with the same compressor as the installation hole of the original compressor base. The connection method, two wire starting capacitor is connected with the compressor running "M" terminal, a lead wire of the capacitor is connected with a starting "S" terminals, overheating, overcurrent protection wire is connected with the compressor of the public "C terminal" test machine compressor to start a successful normal, pressure, time, and R22 refrigerant test machine the air conditioner refrigeration recovery.
例5、格力KFR-65LAK空调器制热时压缩机连续工作后室内机风扇不转
Example 5. When the GREE KFR-65LAK air conditioner is heated, the fan does not turn after continuous working of the compressor.
故障现象:
Failure phenomenon:
在冬季制热时,室外压缩机连续工作很长一段时间,直至室内机冒出大量热气,而后进入保护停机。室内机风扇始终不运转。
In the winter heating, the outdoor compressor works for a long time, until the indoor machine runs out a large amount of heat, and then enters the protection stop. The indoor fan is not running all the time.
检测与判断:
Detection and judgment:
出现这种故障的原因有以下几点
The reasons for this failure are the following
(1)室内机热交换器上的管温感温头TH3损坏或断线,指示电脑板无法检测到室外机送进的热气信号。
(1) the temperature and temperature head TH3 of the indoor heat exchanger is damaged or broken, indicating that the computer board can not detect the heat signal sent by the outdoor machine.
(2)电脑控制板上的CPU不能识别管温热敏电阻变化。
(2) the CPU on the computer control board can not identify the change of the temperature thermistor of the tube.
(3)与感温头相串联及并联的电阻、电容变质或损坏。
(3) the resistance, capacitance, or damage of the resistance and capacitance in series and parallel with the temperature sensing head.
(4)相关继电器损坏。
(4) the related relay is damaged.
维修方法
Maintenance method
(1)拆开室内机检查,管温传感器TH3连接线被老鼠咬断。测量感温头TH3的阻值,能够随温度改
(1) open indoor machine inspection, pipe temperature sensor TH3 cable is the mouse cut. Measure the resistance of TH3 of temperature sensing head, which can be changed with temperature