1. Small gas flow in the four-way valve will lead to poor results and high low pressure.
2. A large string of gas has no effect. The compressor will be protected for a period of time, but there is no high and low pressure difference. This is also the case when the compressor is broken.
3. No conversion, only cooling but not heating, it may be that the four-way valve coil is broken or the four-way valve is stuck.
4. After the four-way valve is opened wide, it is stuck, only heating but not cooling.
5. The four-way valve core control airway is damaged, sometimes refrigeration, sometimes heating, and sometimes no effect and uncontrolled.
Four-way valve failure judgment method1) The spool valve in the four-way valve is stuck by the dirt (oxidized skin, debris) inside the system, etc., you can tap the valve body of the four-way valve with a wooden stick or glue stick. If the reversing returns to normal, the judgment is correct.
2) The valve body is damaged by the impact of external force (the valve body is concave) and the spool valve cannot be reversed, which can be judged by the appearance observation.
3) The capillary tube of the pilot valve is blocked, leaked, or cracked, and the pilot valve cannot be operated; the system pressure is not established (the system refrigerant is severely insufficient), and the pilot valve cannot be driven to move, and thus the four-way valve main valve cannot be driven to change direction.
4) The valve slide guide frame is broken and the end cover is damaged and deformed due to the liquid hammer inside the system. At this time, the direction cannot be reversed. The two methods 1) and 3) do not work. It can be judged that the valve slide guide frame is broken by the liquid hammer. , The end cover is damaged. Pay special attention to the large proportion of liquid hammer when using Daikin and Sanyo large scroll compressors.
5) The internal clearance of the four-way valve is too large, and the valve seat is slightly burned out when the valve seat is welded. The leakage exceeds the standard, causing gas leakage, making the pressure at both ends of the spool valve balanced, and unable to push the spool valve to change direction. When the methods 1) and 2) are used, Sometimes it can be reversed.
6) The four-way valve body or the welded joint of the pipeline leaks, and it is easy to judge the leakage of oil (refrigerated oil) at the leakage port, or use soapy water to detect the leak. 7). In heating mode, the four-way valve pilot valve coil has no voltage or the coil is burned out (the connector may also be loose or disconnected), causing the pilot valve to not operate and the four-way valve main valve not to change direction. A permanent magnet can be placed on the end face of the four-way valve body or the pilot valve to judge. If the spool valve can be reversed at this time, the judgment is correct.
Four-way valve troubleshooting steps1. Check the power supply circuit of the four-way valve. The air conditioner only supplies power to the four-way valve during heating operation. The power supply check can determine whether it is the four-way valve or the control circuit.
2. Check the four-way valve coil. After confirming that the power supply is normal, check whether the coil is normal. When the coil is energized, you should hear the "click" sound produced when the iron core is pulled in, and you can hear the main valve reversing at the same time. The sound of "babble" produced. When it is suspected that there is a problem with the coil, its resistance can be measured. Normally, it should be about 1.4KQ. If the resistance value is small or infinite, it indicates that there is a short circuit or open circuit inside the coil.
Sfp Fiber Adapter,St Fiber Coupler,St Fiber To Ethernet Converter,Sfp To Sc Adapter
Ningbo Fengwei Communication Technology Co., Ltd , https://www.fengweifiberoptic.com