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Air conditioning low-voltage alarm is one of the most common problems in maintenance work, and the reasons are many. In fact, focusing on the problem of low voltage or low voltage alarm in the air conditioning system, we have sent a lot of articles, but some friends are still asking, and recently many friends are asking, because I specifically share this article, the following is an analysis of the low voltage alarm in the air conditioning system, I hope to help you.
1, air conditioning refrigeration system copper pipe is too long:
During commissioning, the low voltage alarm time set by some air conditioners is relatively low (generally 120 seconds). When the copper pipe of the air conditioner is long, it takes longer for the refrigerant to return to the evaporator, and a low voltage alarm is generated.
Solution: The low voltage alarm time can be increased to 180 seconds. In the case of weather changes, the low voltage alarm time needs to be increased appropriately.
2. Air conditioning indoor unit filter is dirty and blocked:
Air circulation will adsorb dust in the environment on the surface of the air conditioner filter, some users will ignore this problem, day after day, the air conditioner filter is too dirty, the evaporator freezes, resulting in a low voltage alarm failure of the air conditioner.
Solution: Replace the air filter of the indoor unit.
3. Dry filter is dirty or copper pipe oil is blocked:
The copper pipe connection needs to be welded, and some copper slag can not be completely cleaned by blowing, and the stolen goods in the refrigeration system will gather in the dryer filter. During the operation of the air conditioning refrigeration system, there will be temperature differences between the two ends of the filter.
Solution: If the filter is particularly dirty, it is necessary to blow or clean the refrigeration system again. The general treatment method is to replace the filter dryer of the same model and specifications.
4, air conditioning refrigeration system in the low voltage protector failure:
When the pressure is normal, use a multimeter to measure the low-voltage protector line, or short-circuit the low-voltage protector and start the compressor to run. If the refrigeration cycle is normal, it indicates that the low-voltage protector is faulty.
Solution: Replace the low-voltage protector of the same specification and model.
5. The solenoid valve in the air conditioning refrigeration system cannot be opened:
When the refrigeration system is running, the sound of the solenoid valve opening can be heard; If the solenoid valve is not opened, the low pressure will gradually decrease until a low pressure alarm is generated. In the air conditioning control panel alarm reset, the low pressure will not rise, at this time to measure the solenoid valve coil, a resistance value indicates normal, infinity indicates that the coil has burned.
Solution: Replace the solenoid coil with the same specification and model
6. Expansion valve failure in air conditioning refrigeration system:
If the expansion valve is faulty, when the refrigeration system is running, the low pressure does not come up, the high pressure does not rise, and the low pressure of the additional refrigerant cannot rise.
Solution: First adjust the opening degree of the expansion valve, if there is still no effect, you need to replace the expansion valve of the same specification and model (Note: it is necessary to exclude whether the expansion valve is dirty or ice blocked).
7. Refrigerant leakage in air conditioning refrigeration system:
First of all, the air conditioning refrigeration system is tested by hanging a meter, and there is no pressure display when hanging a meter, indicating that the refrigerant in the refrigeration system has leaked light; If there is pressure at this time, the refrigeration system can barely run, add refrigerant, the pressure rises immediately, and it also indicates that the refrigerant leaks.
Solution: First, each location of the refrigeration system is tested to detect whether there are signs of oil leakage, and the oil leakage location is investigated with dishwashing liquid; If necessary, stage the refrigeration system for pressure protection, and then check. After the leak point is found, the welding is burned to repair the leak, and the refrigeration system is re-adjusted.
8, air conditioning refrigeration system condenser cooling effect is too good:
It mainly occurs when the ambient temperature is low, such as in winter. We can often see that in winter, some cooling tower equipment has to close the fan, because the condensing pressure is too low.
Solution: increase the starting pressure of air conditioner; Or rectify the outdoor fan and change it to a speed-regulating fan, which can better solve the problem.
9, the air conditioning refrigeration system in the liquid return pipeline flattened resulting in fluid return is not smooth:
This is less likely to happen, and the copper pipe needs to be checked to find the location of the flattening.
Solution: Find the location of the flattened copper pipe and replace the copper pipe of the same size
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Jiangsu Jincheng Air Conditioning Engineering Co., Ltd. is a comprehensive manufacturer of special air-conditioning equipment design, production, installation, and commissioning of clean room, electricity, tobacco, civil air defense engineering, medical clean room, clean room, electricity, tobacco, civil air defense engineering, medical clean room. Mainly produce JCZK combined air conditioning unit, cooling tower, glass steel ventilated galvanized sheet pipe, stainless steel pipe, polyurethane ventilation pipe and air conditioning accessories, Jincheng air conditioner is wide, the type, the unique model, superior performance, and user Favused.
