Installation Instructions for the Fifth Generation of Gree Central Air Conditioning System

The general manager of Shijiazhuang Bi Haubert Environmental Protection Engineering Co., Ltd., a designated enterprise in indoor air testing, Shijiazhuang, tells you the key points of air conditioning purchase: a good air conditioner can last for ten years, and the price is not low. Therefore, buying air conditioners must not be cheap. Buying air conditioners depends on product quality:

1. Whether to use a famous brand compressor, the compressor is the heart of air conditioning, and a good heart is of course important.

2. Whether to use high-quality and efficient heat exchangers, such as hydrophilic film trapezoidal aluminum sheets and internally threaded copper tubes.

3. Whether to use large wind wheel with unequal cross-flow blades and stepping motor to drive the wind pendulum to realize ultra-quiet design.

4. Whether it is super cooling (heating), quickly reach the set temperature.

5. Whether the appearance of the product is beautiful and harmonious with the home environment.

6. Refrigeration (heat) quantity of the product, and choose the appropriate refrigeration (heat) quantity according to the area of the room.

7. Does this product save electricity? Generally speaking, the higher the cooling capacity (heat), the lower the input power, and the more energy is saved.

8. The length of life. Whether to use microcomputer fuzzy control to realize non-stop operation and whether to defrost automatically.

9. Look at the noise index of the product.

10. Whether there is low voltage automatic compensation function and wide voltage working range. In addition, when buying an air conditioner, you must see that the fins of the evaporator and condenser are arranged neatly, the fins are not damaged, and the fins are closely connected with the copper tube without looseness. Check the operation of the air conditioner, start the air conditioner, and check whether there is abnormal noise in the operation of the compressor; The fan operates normally, with obvious difference between high, medium and low speed and low noise; There is also a flat appearance, beautiful appearance and good quality of plated parts.

1 1. Try to choose low-carbon air conditioners to reduce carbon emissions, implement low-carbon environmental protection and protect the earth.

In principle, there are many air-conditioning brands in the brand market, domestic and foreign, and most of them have their own unique advertisements, so it is difficult for consumers to choose. It is suggested that when purchasing air conditioners, choose products with strong enterprise strength, high brand awareness and perfect after-sales service.

This is based on two considerations. The first is to ensure the implementation of after-sales service, because air conditioning is a household appliance and after-sales service is very important. According to the relevant national regulations, the compressor should be guaranteed for 3 years, and the competition in the home appliance market is almost fierce. Some manufacturers often have a short life cycle, and some collapse in three to five years. When an enterprise goes bankrupt, its promise will naturally be difficult to realize. Greedy and cheap, buy products with weak enterprise strength and low brand awareness, and there will be endless troubles. Secondly, consider the quality, because the quality of air conditioners with strong enterprise strength and high brand awareness is relatively stable. Such enterprises not only have strong technical strength, but also pay special attention to quality, so the quality of such products is guaranteed. After consumers choose the brand of air conditioner, they decide where to buy it. When buying an air conditioner, it is particularly important to choose a merchant. Because strictly speaking, the air conditioner is a semi-finished product, which can be used not after being bought from the store, but after being installed and debugged by a professional team. If the installation and debugging are not good, it will bring a series of problems, such as poor ventilation, water leakage of pipe joints, human failure during debugging and so on. These will not only affect the use effect, but also add a lot of trouble. At the same time, many after-sales service measures of manufacturers also need to be implemented and implemented by merchants. Therefore, it is very important to choose a good merchant. As for the choice of merchants, people in the industry suggest that those big merchants with strong local strength and influence should be chosen first, because these merchants have many kinds of business and sales, and generally have professional installation and debugging teams, with guaranteed installation and debugging quality and perfect after-sales service.

Secondly, choose those businesses that sell air conditioners for a long time, and try not to buy them from short-term dealers, because such dealers' after-sales service will be greatly discounted. Buying air conditioners by measuring rooms is a kind of high-consumption household appliances. If the selected power is too small, it will not work. Too much power is wasted.

Therefore, when consumers choose the power of air conditioning, they should measure the room to buy.

First, don't be greedy. Some consumers like to buy large air conditioners, which is not desirable, because except for some special factors, household air conditioners have their scope of use. Consumers should choose the type of air conditioner according to the area of their room when purchasing. In general, the required cooling capacity and heating capacity of a room can be calculated according to the following formula. Cold storage area × 140W to180w; Heating room area × 180W to 240W. In addition, it should be increased or decreased according to the orientation, height and sealing degree of the room.

The second is to choose according to the design of the room flexibly. Don't buy a large air conditioner in the living room to save the room like some families do. This will not only make it difficult to keep the room, but also cause waste. The reasonable way is to buy some low-power air conditioners according to the room type and manage each room. In this way, on the surface, the initial investment is more, but in the long run, it is still cost-effective.

For example, buy a set of 1 10 square meters of three rooms and two living rooms in the living room, which can protect both the living room and the dining room, and the bedroom can also be divided into 1 small air conditioning. This is more reasonable than buying a big air conditioner for three horses to put in the living room. Refrigeration capacity The refrigeration capacity of air conditioners in the market should be expressed in W (watts), and Malay is often used to describe the refrigeration capacity of air conditioners in the market. The conversion relationship between them is: the cooling capacity of 1 horse is about 2000 kcal, which should be multiplied by 1. 162 when converted into international unit watts, so the cooling capacity of 1 horse should be 2000 kcal× 1.162.

For example, the living room area of a family is 15 square meters. If the required cooling capacity per square meter is 160W, the required cooling capacity of air conditioner is 160 W× 15 = 2400 W, so that KF-2500W split wall-mounted air conditioner with cooling capacity can be purchased according to the required cooling capacity of 2400 W. The so-called energy efficiency ratio, also known as performance coefficient, is the ratio of the cooling capacity of an air conditioner to its power consumption. Usually, the energy efficiency ratio of an air conditioner is close to 3 or greater than 3, which is an energy-saving air conditioner.

. For example, one air conditioner has a cooling capacity of 2000W and rated power consumption of 640W, while the other air conditioner has a cooling capacity of 2500W and rated power consumption of 970W. The energy efficiency ratios of the two air conditioners are: the energy efficiency ratio of the first air conditioner is 2000W/640W=3. 125, and that of the second air conditioner is 2500 W/970 W =. In this way, by comparing the energy efficiency ratio of the two air conditioners, we can see that the first air conditioner is an energy-saving air conditioner. The output cooling capacity (heat) of the air conditioner to be purchased by 8 people should correspond to the use area. Due to the differences in room conditions and regional climate, as well as the plan for extreme weather, it is necessary to buy large air conditioners instead of small air conditioners. There are many factors that affect the heating effect of air conditioning, the most important of which are floor, sunshine, west window and apartment type. So how to accurately calculate the air conditioning power required by the room? Firstly, the required cooling capacity per square meter is set as150 w; If the top floor and the west sun account for one of them, it will be calculated as 200W per square meter; If there is a west window or a top floor with the west sun, at least 250 W； per square meter; There are both west windows and top floors, with at least 300 W； per square meter; Only more can not be less, otherwise the constant speed machine will not stop or the frequency converter will run at full speed until the protection is started, resulting in the inability to adjust the indoor air temperature; For regional selection, please refer to the table below. The room area is suitable for air conditioning size (refrigeration) 65438+200m2, 23 machines (primary one) 10M2- 14m226 machines (freshman one) 14M2- 18M2 32 machines (small half)/kloc. 2-45M2 6 1 machine (two and a half) 45M2-55M2 75 machine (Big Three) Selection of fixed speed and variable frequency household air conditioners can be divided into variable frequency and fixed speed. For the same number of air conditioners, the ability of variable frequency air conditioners to adjust indoor temperature is greater than that of constant speed air conditioners. Frequency conversion air conditioner has relatively high cost performance and is more energy-saving to use.

In addition, the inverter air conditioner can accurately control the temperature and prevent "air conditioning disease" in a certain program.

Power consumption of constant speed air conditioner:

① The starting current of the constant-speed air conditioner is several times of the rated current. During operation, the constant-speed air conditioner frequently starts and stops, which is very power-consuming.

(2) Constant-speed air conditioner has been heating at rated high power during operation, and the air conditioner stops after the room temperature rises to the set temperature of air conditioner plus 1 degree. After the air conditioner stops, when the room temperature drops to the air conditioner set temperature minus 1 degree, the air conditioner starts again, and so on. So is refrigeration.

③ Constant-speed air conditioner has insufficient heating capacity in winter, with electric auxiliary heating elements, and its energy efficiency ratio is only 1. The electric auxiliary heating power of constant speed air conditioner is 1~2kW, which consumes a lot of electricity.

2. Power saving of inverter air conditioner: ① Inverter air conditioner is started by soft start, with no surge current and no waste of electric energy.

② During operation, the inverter air conditioner is heated at high frequency. When the room temperature reaches the set temperature of the air conditioner, the air conditioner turns to low-frequency operation without stopping to keep warm. The power consumption of continuous low-frequency operation is only one third or even one quarter of the rated power. So is refrigeration.

③ Inverter air conditioners have no electric auxiliary heating elements with high power consumption. To sum up, the continuous low-frequency operation of inverter air conditioner has neither impulse current that starts frequently, nor high-power operation for a long time like that of constant-speed air conditioner, nor electric auxiliary heating elements that consume a lot of electricity. Therefore, frequency conversion air conditioning is more energy-saving than constant speed air conditioning.

Certification marks The following are common air-conditioning quality certification marks in the market: 1. CCIB mark: the inspection mark of China Import and Export Commodity Inspection Bureau. 2. "Great Wall" logo: China Electrical Product Certification (CCEE) quality certification logo.

3. A.S. mark: the mark used by the Australian Standards Association (SAA) for electrical and non-electrical products is protected by the Federal Business Code and is widely used internationally. Certification mark 4. BEB mark: the inspection mark of the British insurer's laboratory. This sign is very popular and authoritative in many countries in the world. 5.UL mark: the certification mark of American insurer's laboratory. 6.JIB mark: the mark issued by Japan Standardization Organization (JIB) for its qualified electrical products and textiles. 7.CECC mark: European electrician certification mark.

When consumers buy air-conditioning products, in addition to the brand, performance, specifications and other aspects, various quality certification marks can also be used as a reference.

Setting installation and setting skills refrigeration setting From the start-up index of air conditioners in summer, 30-33℃ belongs to Grade 4, and 70% of people need to turn it on; 33-35℃ belongs to level 5, and 90% people need to turn it on. Pay attention to adjust the indoor and outdoor temperature difference after turning on the air conditioner. The room temperature should be set at about 24℃- 18℃, and the temperature difference between indoor and outdoor should not exceed 7℃. If the outdoor temperature is 32 degrees, the indoor air conditioner is generally 25 degrees. When the air conditioner cools, the set temperature is about 26-28℃. In this case, not only the human body feels more comfortable, but also it is conducive to energy saving. Don't set the temperature too low when the air conditioner is cooling. When the room temperature is adjusted to 26-27 degrees, the cooling load can be reduced by more than 8%. Experiments show that under normal circumstances, if the room temperature is kept at 28-29 degrees and the humidity is kept at 50-60%, people will not feel sultry and sweaty, which belongs to the comfortable range. When people sleep, their metabolism decreases by 30-50%, so the air conditioner can be set on the sleep switch, and the set temperature is 1 degree, which can save electricity10%. Heating setting The optimal temperature for air conditioning temperature setting in winter is 20℃. Moderate indoor temperature is not only beneficial to health, but also can avoid air conditioning overload. When heating, use the low windshield at first and the medium windshield after half an hour. For friends who like to raise the indoor temperature, please be sure not to set the temperature at the limit of 30℃ that the air conditioner can withstand in winter, otherwise it will lead to frequent start-up or non-stop of the air conditioner, increase power consumption, and even damage the air conditioner compressor in serious cases. Because the heat flow is lighter than air, it is easy to float on the whole closed room. When using a wall-mounted air conditioner, it is best to adjust the air outlet to a downward angle, which can save electricity. Setting Attention The setting of air conditioning temperature must be kept within a reasonable temperature range, that is, 26℃ ~ 28℃ in summer and 18℃ ~ 20℃ in winter. The air conditioning temperature should not be too different between indoor and outdoor, and it is generally appropriate to be between 5℃ and 10℃. If the temperature difference is too large, it is easy to catch a cold and other diseases. Installation location In general, the installation location of the air conditioner should avoid heat sources, and the elimination of hot air and noise interference should not affect neighbors. The installation height of outdoor unit should be lower than that of indoor unit, which is beneficial to the circulation of refrigeration oil. The outdoor unit shall be installed to avoid short-circuit circulation of hot air, so as not to affect heat dissipation: the installation position shall be convenient for maintenance and drainage, and shall not affect pedestrians, and avoid or stay away from high-voltage lines, radioactive places and inflammable and explosive places. There should be no obstacles in front of the indoor unit installation, and the spraying distance of cold air (or hot air) should be ensured to make the indoor temperature more uniform. Maintenance before startup. Under normal circumstances, household air conditioners will be shut down in September and will not be turned on until May-June of the following year, and the shutdown time will exceed half a year. Therefore, a comprehensive "diagnosis" must be made before the air conditioner is turned on to check whether there is a "fault" in the air conditioning equipment. According to the inspection results, under the guidance of professional and technical personnel, do a good job in maintenance and cleaning, including the casing, fuselage and filter screen of outdoor and indoor units, and then start trial operation to observe the cooling speed and effect. Maintenance in the process of air conditioning start-up depends on many factors such as environmental conditions, climate conditions, start-up time, surrounding dust, air cleanliness, room cleanliness and so on. Poor environmental conditions, hot weather, outdated air conditioning, long start-up time of air conditioning, and increased maintenance times during air conditioning start-up, generally once a month and a half. If the environmental conditions are good, the air conditioner is relatively new, there is less dust in the air, and the air conditioner can be turned on reasonably and can be used alternately with the electric fan, then the maintenance cycle can be extended appropriately, from air conditioner on to air conditioner off 1-2 times. Maintenance should be careful and meticulous, leaving no dead ends. Reach the standard, improve the cooling speed and effect, and achieve energy saving, freshness and comfort. Maintenance after shutdown, it is a perennial law to turn on the air conditioner when the weather turns warm and turn off the air conditioner when the weather turns cold. Pay attention to the comprehensive and detailed inspection of outdoor units and indoor units before the air conditioner is turned off. Maintenance, maintenance and cleaning should be done one by one. Leaky links should be tightened and strictly checked. After the above steps are completed, cover the air conditioner to prevent dust pollution, prevent the air conditioner from dripping into water, keep it clean, prepare for reuse next year, save energy and prolong the service life of air conditioning equipment. Focus on protecting high-quality distributors and cabinets of well-known brands, and give full play to the energy-saving effect.

Conventional air conditioning maintenance

1. Remove the sundries in the vent to ensure normal ventilation. Observe whether the outdoor rack is loose, and clean the outdoor ventilation net cover for foreign objects. At the same time, keep the vents open.

2. Clean the surfaces of indoor and outdoor heat exchangers to improve the efficiency of heat exchangers. When cleaning the indoor heat exchanger, carefully remove the panel, scrub it with a soft rag, and gently scrub the heat exchanger of the indoor unit with a small brush to remove the harmful accumulation of dust and breeding bacteria. However, it should be noted that the heat sink is very thin aluminum, which is easy to deform after being stressed, so brush it carefully.

3. Remove the dust from the filter screen. When cleaning the filter screen, cut off the power supply first, and then open the air intake grille; Take out the filter screen, clean the filter screen with water or vacuum cleaner, the water temperature should not exceed 40 degrees, clean it with hot wet cloth or neutral detergent, and then wipe it with dry cloth. At the same time, it is not allowed to clean the filter screen with pesticides or other chemical cleaners.

4. Remove dirt and deposits from the drainage part. The drainage part is easy to deposit dirt, so it must be disinfected thoroughly on a regular basis to ensure smooth drainage and prevent bacterial reproduction.

5. Check others. Comprise a power cord, a plug board and a switch; Check the status of consumable parts, such as air deflector, sterilization and dehumidification, photocatalyst, etc. , to ensure that the air conditioner is in good condition. Air-conditioning maintenance in special periods is in March-May and September-165438+1October, when the temperature is moderate, people usually leave the air-conditioning in a non-working state. In the season when the air conditioner is not used, the power supply of the air conditioner should be cut off first, but it is best to keep the usage once a month to prevent the lubricating oil in the machine from condensing due to long-term non-use. At the same time, in order to ensure the long-term high-speed operation of the air conditioner and the extension of the use task, attention should be paid to the maintenance when the air conditioner is stopped and started to use.

1. After the use season ends. Before stopping using the air conditioner, you can set the air conditioner to the air supply state on sunny days, and turn on the air conditioner for about half a day to make the air conditioner completely dry; At the same time, the dust filter, indoor unit and outdoor unit should be cleaned.

2. Before the season starts. Check whether there are obstacles in the air inlet and air outlet of indoor and outdoor units, so as not to reduce the working efficiency of air conditioning; Install dust filter to prevent dust from entering the machine and causing damage or failure of the machine; The remote control should be cleaned with a dry cloth, not with glass cleaner or cloth containing chemicals. After cleaning, two new batteries of the same model should be installed. Cleaning methods The cleaning of air conditioners includes three parts: first, the shell and exposed part of the air conditioner body are easy to be polluted;

The cleaning of the second filter is the most important part of the core; The third condenser and evaporator, relatively rare, combined with maintenance, is equivalent to cleaning a small system. They are relatively large "operations", and old air conditioners or "special price machines" and "inferior machines" often appear. Quite a few of these air conditioners have no cleaning and maintenance value, so I won't go into details. The cleaning of the air conditioner shell and corresponding components is very simple. As long as a little soap powder and detergent are added to the clean water, or special air-conditioning cleaning liquid, a considerable part of air conditioners can be cleaned, which meets the cleaning operation requirements.

As for the cleaning of household air conditioners, the key part is the cleaning of filter screens. First, open the cover of the air conditioner, take out the filter screen and brush it with a clean filter screen to clean most of the dirt attached to the filter screen. Then soak in the mixed solution containing special air conditioner cleaning solution or self-made cleaning solution or detergent and soap powder for 65,438+00-20 minutes, depending on the dirt on the filter screen. After soaking, gently brush the filter screen with a bottle brush. If it is normal, you can sign for it, and the cleaning work is over. Cleaning the household air conditioner is beneficial to improve the refrigeration efficiency; It is beneficial to improve the refrigeration effect, prolong the service life of household air-conditioning equipment, improve the energy-saving effect and benefit the health of users. The effect is healthier and more ideal than "healthy air conditioning". Years of practice in the air-conditioning industry have proved that it is best to clean the air conditioner 2-3 times a year. Under normal circumstances, it is reasonable to clean the air conditioner once before starting, once in the middle and once when shutting down. Sometimes, when the air conditioner is turned off, it will go through major cleaning processes such as maintenance, maintenance and cleaning. And the air conditioner is covered with a range hood. When the air conditioner is turned on in the second year, it is cleaner and the filter screen is cleaner. At this time, the air conditioner is cleaned twice a year, which has a good effect, saves labor and costs, reduces operating costs, and does not affect the refrigeration effect.

Note: 1, the power supply voltage should not fluctuate too much (10% fluctuation is allowed), the air conditioner is powered by a dedicated line, and the single-phase three hole socket is used, and the plug should be plugged to the bottom.

2. The casing of the indoor unit should be cleaned frequently, and generally it can be wiped clean with a clean dry cloth or neutral detergent, and it is absolutely not allowed to be washed directly with water. If it is wiped with a cloth, it should be done after the power failure.

3. The indoor temperature should not be adjusted too low, otherwise it will be bad for the human body, so the set temperature should be adjusted appropriately.

4. If you feel that the indoor temperature is too high, you can lower the set temperature appropriately.

5. The effective use of timer can achieve both energy-saving and comfortable effects.

6, air conditioning room personnel should not be too much, too crowded, otherwise the cooling capacity is insufficient, the temperature is difficult to drop;

7. Don't switch the doors and windows of the room frequently, and people don't go in and out frequently to avoid the loss of air conditioning;

8. The glass window must be closed tightly and tightly, and double white curtains should be hung inside to reflect the partially penetrated light and heat;

9. The window can be opened briefly during indoor ventilation, and the window opening time generally does not exceed 10 minute;

10, the air filter should be cleaned regularly, otherwise the airflow is blocked, resulting in insufficient air volume and rising room temperature; Clean air conditioning

1 1, the temperature should be adjusted during sleep, and the air conditioner can automatically adjust the sleep temperature;

12. The outdoor unit should be firmly installed to reduce vibration and noise, and sufficient space should be left in front of the suction and exhaust ports of the condenser to facilitate ventilation. If the wind is blocked, the condensation pressure will rise, leading to shutdown;

13, there should be no obstacles in front of the indoor unit, otherwise the wind will be affected;

14, when the air conditioner is just turned on, you can adjust the selector switch to high speed, and then adjust it to medium speed and low speed after the temperature drops; 15, the ventilation switch can be used for window air conditioning ventilation, but the ventilation time does not exceed 15 minutes;

16, too much dust in the outdoor radiator of air conditioner will reduce the efficiency, so the outdoor radiator should be checked and cleaned regularly (it can be blown clean with compressed air after power failure);

17, wooden sticks are not allowed to be inserted into the outdoor unit of split air conditioner, otherwise the fan will be stuck or damaged;

18, when you feel that the air conditioner is not ideal, you should consult the instruction manual, analyze whether it is caused by improper use, and correct it after finding out the reason;

19, if the fault cannot be handled by itself, you can find a professional maintenance mechanic in the original installation department to solve it, or contact the local service personnel of the brand company, and you can't repair it by yourself or find a non-professional to repair it;

20. Unplug the power plug when the air conditioner is not in use;

2 1, the air conditioner must be restarted after stopping for three minutes to protect the compressor;

22. Air conditioner with remote control (don't put it where children can easily get it) Don't let children operate as toys to avoid damaging the machine. A new type of air conditioner that can continuously adjust the frequency or speed of the compressor within a certain range, that is, change the flow rate of refrigerant, give full play to its best matching ability with the environmental state, and automatically adjust the output. Frequency conversion air conditioner adopts digital signal processing, analog control and artificial intelligence control. Compared with ordinary air conditioners, inverter air conditioners have the advantages of rapid cooling and heating, high efficiency and energy saving, comfort and reliability, intelligent defrosting, large dehumidification capacity, ultra-quiet operation and wide voltage operation. Common fault phenomena in fault judgment

The refrigeration system is dirty and blocked by ice; Air filter is blocked; The air inlet and air outlet are blocked by obstacles. The windings of motor, fan motor, solenoid valve coil, relay coil and contact were burned. Fan stuck, bearings of moving parts stuck, etc. The basic methods to judge the common faults of household air conditioners are: seeing, listening, touching, measuring and analyzing. 1. Look: carefully observe the working conditions of various components of the air conditioner, focusing on the refrigeration system, electrical system and air system to determine whether they are working normally.

Refrigerated oil), clean soft cloth and soft paper can also be used to wipe the joint of pipeline welding and joint, and observe whether there is oil pollution to judge whether there is leakage. 2. Listen: Listen carefully to whether the compressor of the air conditioner is running normally, whether there is abnormal noise, whether the fan is running noisily, whether the noise is too large, etc. Under normal circumstances, the air conditioner has slight vibration and low noise, generally below 50DB. If the vibration and noise are excessive, the possible reasons are:

Foam plastic cushion, etc. , will increase the vibration and noise of the air conditioner during operation. Especially at the beginning and stop. When the chassis collides, the axis of the fan moves and the blades are out of balance, which will also make a collision sound; If there is a foreign body in the fan, the blades will also collide with it. 3. Touch: Touch the relevant parts of the air conditioner by hand to feel its cold, heat and vibration, which is helpful to judge the nature and location of the fault. In general, the temperature of the condenser gradually decreases from top to bottom, and the temperature in the lower part is slightly higher than the ambient temperature. If the whole condenser is not hot or the upper part is slightly warm, or although it is hot, the temperatures of two adjacent tubes are obviously different, it is abnormal. Evaporator Under normal circumstances, if you immerse your fingers in the water on the surface of the evaporator, you will feel cold and sticky. In general, the capillary at the dryer and outlet should feel warm (slightly higher than the ambient temperature, and basically the same as the pipeline temperature at the end of the condenser). If the temperature is lower than the ambient temperature, the temperature difference between the condensation on the surface and the capillary section is abnormal. Under normal circumstances, the temperature of the suction pipe 200MM away from the compressor should be close to the ambient temperature.

4. Measurement: In order to accurately judge the nature and location of faults, it is often necessary to check and measure the performance parameters and status of air conditioners with instruments. If a leak detector is used to check whether there is refrigerant leakage; Use a multimeter to measure whether the power supply voltage, grounding current of each terminal and working current meet the requirements, and the computer-controlled air conditioner should also measure whether the potential of each control point is normal.

5. Analysis: Most of the results obtained by the above inspection methods can only reflect a certain local state. All parts of air conditioning are interrelated and influence each other. A fault phenomenon may have many reasons, and a reason may also produce many faults. Therefore, the local factors should be comprehensively compared and analyzed to determine the nature and location of the fault comprehensively and accurately.