Midea Air Conditioning National 24-hour Service Hotline:
After-sales service process:
Customer reported an error-> the company registered to accept dispatch-> contact the customer at home-> check the fault at home and quote-> accept the maintenance quotation-> fill in the warranty form after the maintenance is completed and confirm the user's signature-> the company pays a return visit to the customer-> the customer confirms the maintenance result-> enters the warranty period!
Service items:
1: Air-conditioning maintenance: professional air-conditioning repairman, repairing various brands of air-conditioners, and the air-conditioning maintenance warranty is half a year.
2. Air conditioning transfer: professional car door-to-door air conditioning transfer. Auxiliary materials of air conditioner, indoor machine cleaning. Ensure the consistency of cooling and heating before and after transfer.
3. Air conditioning installation: professional installers install (disassemble) various brands of air conditioners, design and debug them free of charge, install accessories free of charge, and guarantee them for one year.
4. Air-conditioning fluorine: professional brand air-conditioning fluorine, air-conditioning fluorine, one-year warranty.
5. Air conditioning cleaning and maintenance: Air conditioning cleaning will reduce the power load of air conditioning, reduce the operating cost and maintenance cost of air conditioning, and extend the service life of air conditioning. Professional cleaning agent for door-to-door air conditioning is at your service.
Service area: there are maintenance service outlets in urban areas and surrounding towns (districts, etc.). ), and arrange for the nearest master to come to the door for maintenance.
Service process:
1. After the on-site inspection, the master will inform the fault and the accessories that need to be replaced/repaired according to the actual situation.
2. If the parts to be replaced are not listed in the charging standard, you can negotiate the price with the master before maintenance;
3. If the user gives up the maintenance after the master's on-site inspection, he only needs to pay the on-site inspection fee of 3,050 yuan;
4. If the operation is too difficult for the master to repair, you can cancel the service and refund all the order amount to the user.
Service guarantee:
1, clearly marked: all possible charges in the service will be charged according to the charging standard;
2. Warranty: Within 180 days after the service is completed, if the repaired parts are abnormal or the repaired electrical appliances have faults of the same nature, you can contact the merchant for free maintenance. Animal injury, power supply problems, liquid intake, human factors, unauthorized disassembly, etc. Not covered by the warranty.
Description of expenses:
1. If the master cancels the service due to the customer's reasons, 30 yuan's empty running fee, that is, the master's gas money, will be charged. I hope you can understand.
2. The project price in this post is not used as the basis for charging, nor is it the actual transaction price. The actual transaction price is subject to the unified charging standard presented by the master.
3. If the maintenance is not completed due to our factors, such as too difficult maintenance or no spare parts, the advance payment can be fully refunded without any charge.
4. Contact the engineer privately, and the problems (property safety, personal safety, etc. ) has nothing to do with the company;
5. Except for this purpose, the company forbids engineers to charge extra fees without permission. If it happens, please call customer service directly to make a complaint.
6. The fault caused by installation shall be guaranteed for 30 days, and the fault caused by maintenance shall be guaranteed for 90 days. During the warranty period, the same fault will be repaired free of charge, and a regular warranty card will be provided.
Since its establishment, the company has constantly summed up experience, improved itself, and devoted itself to the business philosophy of pragmatism, innovation and development. The company adheres to the business policy of survival by reputation and development by service quality, which is well received by customers from all walks of life.
The company provides customers with the installation and maintenance of various imported and domestic brand air conditioners, and supplies various imported and domestic brand air conditioners. Because of professional concentration, I trust and rest assured.
Quality is our life. York after-sales maintenance service center will continue to grasp the lifeline of scientific and technological development, continue to uphold the concept of high-quality and timely professional service, take honesty as the foundation, and provide our customers with better service with innovative maintenance technology and higher and higher service standards!
More and more air conditioners are entering people's homes, not only in cities, but also in rural areas. The use of air conditioning is really more and more extensive. But after using it for a long time, there will always be some minor problems more or less. I wonder how everyone solves it. In fact, everyone should know how to maintain the air conditioner when using it. Good maintenance methods will prolong the life of air conditioners.
Common faults of midea air conditioner
There are five substances in the circulation of refrigeration system, such as refrigerant, oil, water, air and other impurities. The first two substances are necessary to ensure the normal operation of the system, while the last three substances are harmful to the system, but they cannot be completely eliminated. At the same time, the refrigerant itself has three States: vapor phase, liquid phase and vapor-liquid mixed phase. Therefore, once the air conditioning refrigeration system fails, its symptoms and causes are more complicated. Below, eleven common faults of air conditioning refrigeration system are listed.
1, picture of fan not rotating
There are two reasons why the fan does not turn: one is electrical failure and the control circuit is not connected; The second is the mechanical failure of the fan shaft.
When the air-conditioning fan in the room does not turn, the temperature of the air-conditioned room will rise, and the suction pressure and exhaust pressure of the compressor will drop to some extent. After the air-conditioning fan does not turn, the heat exchange efficiency of the heat exchange coil in the air-conditioned room decreases, and the temperature of the air-conditioned room will increase when the heat load of the air-conditioned room remains unchanged.
Due to insufficient heat exchange, the temperature of refrigerant in the heat exchange coil will decrease relative to the original temperature, that is, the evaporation temperature will decrease and the refrigeration coefficient of the system will decrease. The outlet temperature of the evaporator detected by the thermal expansion valve also decreases, which leads to the decrease of the opening of the thermal expansion valve and the corresponding decrease of refrigerant, so the suction and discharge pressures are reduced. The overall effect of reducing refrigerant flow and refrigeration coefficient is to reduce the refrigeration capacity of the system.
2. The inlet temperature of cooling water is too low.
With the decrease of cooling water temperature, the compressor exhaust pressure, exhaust temperature and filter outlet temperature all decrease. However, the temperature of the air-conditioned room remains unchanged, because the cooling water temperature has not dropped to such an extent that it will affect the refrigeration effect. If the cooling water temperature drops to a certain extent, the condensation pressure will also decrease, resulting in a decrease in the pressure difference between the two sides of the thermal expansion valve, a decrease in the circulation capacity of the thermal expansion valve and a decrease in refrigerant, so the refrigeration effect will be reduced.
3. The inlet temperature of cooling water is too high.
If the inlet temperature of cooling water is too high, the refrigerant will be supercooled, the condensation temperature will be too high and the condensation pressure will be too high. The pressure ratio of the compressor will increase, the shaft power will increase and the gas transmission coefficient will decrease, thus reducing the refrigeration capacity of the system. Therefore, the overall cooling effect will be reduced and the temperature of the air-conditioned room will rise.
4. The circulating water pump does not rotate.
When the refrigeration unit is commissioned, the circulating water pump of the system should be turned on first. When the circulating water pump is not running, the outlet temperature of cooling water and the outlet temperature of condenser refrigerant rise most obviously. Due to the sharp decline of the refrigeration effect of the condenser, the suction temperature and exhaust temperature of the compressor also rise rapidly, and the rise of condensation temperature also makes the evaporation temperature rise, but the increase of evaporation temperature is not as large as that of condensation temperature, so the refrigeration efficiency decreases and the temperature of air-conditioned room rises rapidly.
5. The filter blocks the image
A clogged filter is a dirty system. Under normal circumstances, dirt often appears on the filter. This is because the screen of the filter blocks the cross section of the channel and filters out dirt, metal chips and other impurities. After a long time, the refrigeration and air conditioning are blocked.
The result of filter blockage is that the refrigerant circulation is reduced, similar to that the expansion valve is too small. For example, the temperature of compressor suction and exhaust increases, the pressure of compressor suction and exhaust decreases, and the temperature of air-conditioned room increases. The difference is that the outlet temperature of the filter is getting lower and lower. This is because throttling is started at the filter, which leads to the local temperature reduction of the system, and when the situation is serious, local frosting or icing will occur.
6. The air-conditioned room is full of pictures.
Due to the effects of indoor internal disturbance and external disturbance and various factors, the temperature of air-conditioned room will rise when it is overloaded, and finally it can't reach the temperature index that normal air-conditioned room should maintain. At the same time, the two most affected parameters are compressor suction temperature and exhaust temperature.
Due to the influence of heat capacity of air-conditioned room, it will take some time for other parameters to be obviously affected.
7. The cooling water flow is too small.
Because of the relationship between the cooling water pipe and the cooling water valve, the configuration of the cooling tower in the system is too small or there is too much scale in the cooling tower, the cooling water flow rate is too small and the cooling water inlet temperature is too high, which are also common faults.
When the cooling water flow rate is too small, the heat exchange effect of the condenser decreases, so the outlet refrigerant temperature of the condenser increases, the condensation temperature of the refrigerant increases, and the refrigeration coefficient decreases, which affects the refrigeration effect.
When other conditions remain unchanged, the temperature of the air-conditioned room will also rise to a certain extent, and the suction temperature of the compressor will also rise. But the most obvious change is that the temperature difference at the cooling water outlet will become larger and larger.
8. Diagram of expansion valve opening.
When the expansion valve is too small, the refrigerant charge of the refrigeration system is normal. When the expansion valve is too small, the whole system lacks circulating refrigerant. Under the same other working conditions, the liquid state-making agent can not fully absorb heat when vaporizing at low pressure, so the return air superheat is very high, and the intake and exhaust temperature and air conditioning room temperature rise again, and the intake and exhaust pressure will drop.
The temperature of the refrigerant at the outlet of the condenser will decrease (that is, the refrigeration capacity of the system will increase), because the heat exchange capacity of the condenser has not changed, but the refrigerant flow circulating in the whole system is very small, although the refrigeration coefficient is improved at this time, and the unit refrigeration capacity is improved. However, the total cooling capacity decreases, so the temperature of the air-conditioned room will increase.
There is a small opening on the expansion valve (where the yellow arrow is located). Adjusting the opening of the expansion valve means adjusting the size of the small opening. The bigger the opening, the bigger the caliber, and the more liquid there will be.
9. pictures of insufficient refrigerant
Too little refrigerant is usually caused by two reasons: first, the product is not filled before leaving the factory, and it is generally small; Second, the unit runs all the year round, and too little refrigerant is caused by the leakage of the valve or the welding part of the system, which is a common fault. There is no obvious difference between insufficient refrigerant and too small opening of expansion valve.
10, picture of excessive refrigerant.
Too much refrigerant comes from blindly charging refrigerant, which is not uncommon in the maintenance of refrigeration system. This will reduce the effective heat exchange area in the condenser, reduce the heat exchange effect, and cause the condensation temperature to rise, the condensation pressure to increase and the high pressure to be too high.
Too much refrigerant enters the evaporator and is not fully gasified, resulting in low pressure and high pressure, condensation or frost on the cylinder head of the compressor, and even cylinder collision accidents. Part of the liquid refrigerant enters the compressor, which makes the motor load heavier, difficult to start and overload the current during operation. In severe cases, the motor will be burned due to overload.
1 1. Damage picture of compressor suction valve and exhaust valve.
For reciprocating compressor, the damage of compressor suction and exhaust valve is a common mechanical failure. In this experiment, compressor suction and exhaust bypass are used to simulate. When the fault occurs, the suction temperature and pressure will rise, and the exhaust temperature and pressure will drop, which is equivalent to the actual gas transmission of the compressor, so the cooling effect is poor and the temperature of the air-conditioned room will rise rapidly. When the situation is serious, the low-voltage relay will stop the compressor.
There are many germs in the air conditioner! Many families have begun to use air conditioners, but if the air conditioners are not cleaned for a long time or are not thoroughly cleaned, the germs hidden in the radiator, wind wheel and other parts will be blown out with the air conditioning wind, causing various "air conditioning diseases" and threatening people's health. Before use, most people will pay attention to cleaning the dusty filter. However, a recent survey by the School of Public Health of Fudan University in Shanghai shows that the radiator behind the filter of household air conditioner is the main source of bacterial pollution, with the detection rate as high as 9 1.259 bacteria /cm2, of which the over-standard rate of mold is as high as 84%. Common air conditioning germs in air conditioning: Bacillus cereus, Staphylococcus aureus, mold, Legionella and many other germs.
2. Low energy efficiency: the cost of low energy efficiency: According to estimates, if the dirt thickness of an air conditioner with an input power of 2 kW reaches 0.25mm after two years of use, it can save about 28% of the electricity bill after cleaning. If you use it for 8 hours a day and 5 months a year, the electricity bill is assumed to be 0.65 yuan/kWh, and the average family has 3 air conditioners. If you don't clean the air conditioner regularly, your household's annual electricity bill is 2× 8× 30× 5× 0.65× 0.28× 3 =1310.4 yuan.
3. Short service life: In general, the service life of air conditioners given by manufacturers is about 10 years. But in fact, because "people don't clean the air conditioner for a long time", "the method of cleaning the air conditioner is incorrect" or "no effective cleaning agent is used", the air conditioner often works with illness, so that the service life of ordinary household air conditioners is only 7 years!
Never buy a bottle of detergent in summer and spray it yourself!
1, which can only be sprayed on the part of the fins seen when the cover is lifted, and nearly half of the fins are not sprayed;
2. The air outlet and wind wheel with relatively concentrated bacteria can't be cleaned, and the air conditioner smells mainly because it is not clean;
Cleaning effect display
(condensed water detection) Escherichia coli: killing rate >; 99.99%
Legionella pneumophila: killing rate >; 99.99%
Staphylococcus aureus: killing rate >; 99.99%
Candida albicans: killing rate >; 96.23
Our company has strong technical force, complete institutions and a technical maintenance and installation team with many years of practical experience. All employees have at least 6 years working experience in this industry. There are also professional and technical personnel who have been engaged in sales, installation and other pre-sales and after-sales services for a long time. After professional course training, maintenance personnel are familiar with the performance, maintenance and management of various equipment, have excellent professional skills and service awareness, ensure the quality of each service, and win the affirmation and trust of our customers.
The door-to-door master has more than ten years of professional experience, excellent technology and enthusiastic service. Before starting maintenance, test, quote and get the customer's consent. No maintenance without security, no root, no maintenance value; Don't waste customers a penny. The maintenance is completed only after the user has accepted it, and a charging document and a warranty card are issued. Pay a return visit after maintenance and ask about the usage of household appliances and the details of charges.