What are the frequent failures after the air conditioning is transferred to the machine?

制冷系统故障是我们维修当中常风的故障，故障现象也是五花八门，千奇百怪，但还是有规律可循，有经验可借鉴。这里介绍的是空调制冷系统故障的检查步骤，虽不是必须的，但是维修时应顺着此思路进行检修。

The failure of the refrigeration system is the common Wind fault in our maintenance. The failure phenomenon is also all kinds and strange, but there are still rules to follow and experience can be used for reference. Here is the air-conditioning refrigeration system fault detection steps, although not necessary, but maintenance should follow this train of thought for repair.

一、制冷系统检修要点

1. The main points of the maintenance of the refrigeration system

1、观察内外机的工作情况：如指示灯板的显示情况，内机是否工作，风速输出是否正常，外机风扇、压缩机是否运行，从而判断是电器问题还是系统问题导致的不制冷。

1, observe the working conditions of the internal and external machines, such as indicating the display of the lamp board, whether the inner machine works, the wind speed output is normal, the fan and compressor run, so that it is the electrical problem or the system problem caused by the non refrigeration.

2、检测空调器各项数据：

2. Check the data of the air conditioner.

A、空调流水情况，一般内机滴水连续空调正常，但受环境湿度、温度影响只能作为一参考值。

A. Air conditioning flow conditions, in general, the drip water continuous air conditioning is normal, but affected by environmental humidity, temperature can only be used as a reference value.

B、进出风口温差，正常的进出风温差应在12-14度，但也会受环境温度、风速的影响。

B. Temperature difference between inlet and outlet, normal temperature difference between inlet and outlet should be 12-14 degrees, but also affected by ambient temperature and wind speed.

C、测量系统管路压力值，一般制冷时低压压力在0.45Mpa-0.50Mpa，制热时高压压力在1.8Mpa-2.2Mpa之间，但压力要受环境温度影响，空调进风温度越高，排气压力越高，冷凝温度越高，反之则小；空调负荷越大，吸气压力越高，蒸发温度升高（蒸发器正常蒸发温度在5-7度之间）。

C, measuring system pipeline pressure value, low pressure of low pressure at 0.45Mpa-0.50Mpa in general refrigeration, the pressure of high pressure is between 1.8Mpa-2.2Mpa, but the pressure should be affected by ambient temperature. The higher the air conditioning air temperature, the higher the exhaust pressure, the higher the condensing temperature, the vice versa, the higher the air conditioning load, the higher the suction pressure and the evaporation temperature. The evaporator's normal evaporation temperature is between 5 and 7 degrees.

二、制冷系统故障类型

Two. Type of failure of refrigeration system

1、制冷系统堵：

1, refrigeration system plugging:

常常发生在毛细管及干燥过滤器处，因为这两个地方是系统中最狭窄的地方，常见的堵塞原因有三种：脏堵、冰堵及焊堵。

It often occurs at capillary and drying filters, because these two places are the narrowest places in the system, and there are three common causes of blockage: dirty plugs, ice plugs, and welding plugs.

A、脏堵一般发生在毛细管的进口处，是因系统内的污物（如焊渣、锈宵、氧化皮等）堵塞了管路，检查时轻轻敲击毛细管处可能会暂时恢复正常，另从管路和元件表面凝露、结霜以及停机时压力恢复速度时间等都可以对堵塞的位置及性质作出判断。

A and dirty plugging usually occur at the inlet of the capillary. It is blocked by the dirt in the system (such as welding slag, rust night, oxide skin, etc.). At the time of inspection, the capillary may be temporarily restored to normal, and the clogging of the pipe and the surface of the element surface, frost, and the pressure recovery time of the shutdown can all be blocked. Position and nature are judged.

B、冰堵一般发生在毛细管的出口处，是因系统含有水分，在毛细管出口处突然汽化降温而凝结成小冰粒堵塞在毛细管的出口处，判断时可在毛细管出口处用焊枪加热如果效果恢复正常或好转说明是冰堵，或是在空调关机后再开机机器又能制冷一段时间，说明是冰堵，冰堵一般发生在新装机或刚维修过的空调上。

B and ice plugging usually occur at the outlet of the capillary, because the system contains water and condenses into a small ice particle at the outlet of the capillary at the exit of the capillary at the outlet of the capillary. It can be heated by a welding gun at the capillary outlet when the effect is restored to normal or better. The machine can also be refrigerating for a period of time, which means ice jam. Ice jam usually occurs on newly installed machines or newly repaired air conditioners.

C、焊堵一般也是发生在毛细管的焊接处，现象与脏堵冰堵差不多，多发生在新装机上。

C and welding blockage usually happen at the welding point of capillary tube. The phenomenon is similar to that of dirty plugging.

2、制冷系统漏：

2. Leakage of refrigeration system:

空调制冷制热的载体是制冷剂，如系统出现漏点，制冷剂泄漏则空调制冷差或完全不制冷，而空调器出现泄漏的地方主要集中在两器的各焊接头、毛细管焊接处、压缩机吸排气管、喇叭口、铜钠子裂、连接管等处，要检查时可先进行目测，重点检查连接管各接头处，泄漏处一般都有油迹。

The carrier of the heat of the air conditioning refrigeration system is the refrigerant, such as the leakage of the system, the cooling of the refrigerant and the completely non cooling of the air conditioner, and the leakage of the air conditioner mainly concentrates on the welding joints of the two devices, the capillary welding place, the suction and exhaust pipe of the compressor, the bell mouth, the cupric sodium subdivision, the connecting pipe and so on. Advanced line visual inspection, focusing on connecting pipe joints, leakage is generally oil stains.

3、四通阀故障:

3, four valve failure:

通常发生在制热时，四通阀吸合不好、串气或卡死，引起制热性能差，在判断时可对四通阀通断电听吸合是否良好，在维修时可通过反复给四通阀通电或轻轻敲打四通阀使其复位。

Usually in heat making, the four - way valve sucks in bad, cross - gas or die, causing poor heat - making performance. In judgment, it can be good for the four - way valve to break off the electricity. In the maintenance, it can be reset by repeatedly giving the four - way valve or beating the four - way valve.

4、单向阀故障:

4, one way valve failure:

单向阀在制冷时直接导通，但在制热时制冷剂要通过辅助毛细管，当单向阀密封不严或是辅助毛细管堵塞时，制热在受影响，因此如果空调制冷正常但制热差时，在排除四通阀问题后要重点检查单向阀。

The one-way valve is directly connected in the refrigeration, but when the heat is made by the auxiliary capillary, when the one-way valve is sealed or the auxiliary capillary is blocked, the heat is affected, so if the air conditioning is normal but the heat is poor, the one-way valve should be checked after the four - way valve problem is excluded.