Causes and solutions of frequent start-up of central air-conditioning compressors
We sometimes encounter frequent start-up of air conditioner compressor, stop for three minutes, the frequency is between 30~55hz, the high frequency does not go up, sometimes the good and bad failure of the air conditioner maintenance analysis and processing when restarting: this problem is caused by the air conditioner The thick film circuit on the outdoor electromechanical control module board is faulty. In case of such problems, the operation procedure for replacing the thick film circuit is as follows
(1) Use a screwdriver to remove the four set screws of the outdoor panel assembly (sheet metal parts), and then turn the assembly up
(2) Remove the two screws fixing the capacitor, move the capacitor to the right or take
(3) Use a screwdriver to remove the (faulty) module from the heat sink. If necessary, replace the thick-film circuit or the entire module.
(4) After applying the professional silicone grease to the heat dissipation surface of the new module, install it on the radiator at the same position
(5) Reset or install the capacitor assembly and fix it firmly
(6) Reset and fix the outdoor panel components (sheet metal parts)
Places to be noted during maintenance
(1) The disassembler should wear the electric ring, otherwise the module will be damaged.
(2) During the disassembly and assembly process, care should be taken to handle gently to prevent the cable from coming off
(3) When the compressor line is reset, the original position should be kept unchanged and cannot be inserted wrongly
(4) The pn line cannot be reversed
(5) The signal cable should be firmly connected and cannot be loosened.
Central air-conditioning compressor type Classification of central air-conditioning compressor
The central air conditioner is the first to mention the compressor of the air conditioner. The compressor is the heart of the central air conditioner. The so-called core technology refers to the compressor technology. Three compressor technologies: swing compressor, scroll compressor, and dual rotor compressor. The difference between different types of central air conditioning
"The swing compressor is an old compressor technology. The dual rotor compressor is suitable for 6 horses and below, and the scroll compressor is suitable for more than 6 horses." This is the explanation we have heard the most. Each indoor unit of the swing compressor is separately connected to the outdoor unit. We understand this form as a form of simulated central air conditioning, which is actually a group of one for one. The connection method of the dual rotor and the vortex is the same, we need to distinguish by his performance The rated turn-on (minimum start-up rate) of the double-rotor compressor is 10%, and the rated turn-on of the 6-horsepower machine is 0.6 hp, which means that if there is only one small room at home with 1 hp of air conditioner, the work with the corresponding number of horses can be achieved. Energy saving.
The rated turn-on of the scroll compressor is 1/3. That is to say, for example, the external unit is 6 horsepower. If there is only one room in the house with 1 horsepower air conditioner, then 1 horsepower will continue to be wasted, because the rated turn-on horsepower is 2 horsepower. Difference between double rotor and scroll
For dual-rotor compressors with 6 HP and below, scroll compressors are suitable for 6 HP and above. Up to 18 HP scroll compressors require the use of dual modules, ie 2 compressors. The multi-module is required to reach the 18-horsepower dual-rotor compressor. For example, the outdoor unit has three compressor modules. The compressor as the core component of the central air conditioner is a very large proportion of the cost. When everyone is within 6 horses, the cost of a single compressor is not much different. When the double rotor compressor between 6-18 horses increases, the cost increases.
Central air conditioning system common fault maintenance method 1. Insufficient configuration of air conditioning cooling and heating load
1. Simply configure the cooling and heating load of the air conditioner according to the air conditioner use area
Due to the activity requirements of indoor personnel, for convenience, the door of the adjacent room will be opened frequently. If the room where the door is opened is not equipped with air conditioning (such as: kitchen room, toilet, dressing room, etc.), the cooling and heating load of the room will be The air-conditioning system forms a corresponding air-conditioning load, which leads to insufficient air-conditioning cooling and heating load configuration, and the temperature in the room is difficult to meet human comfort requirements.
2. The model room type is the same as the actual air conditioning cooling and heating load configuration
To meet the needs of sales, developers often display a complete decoration model for one or a few suites before the building is completed. However, the difference in the actual room type when the project is completed is ignored in the cooling and heating load configuration of the air conditioner.
3. The cooling and heating load configuration at the end of the air conditioner is sufficient, but since the simultaneous use factor of different rooms is considered to be less than 1, and the capacity of the air conditioning host is also configured according to the corresponding factor, then, when the air conditioner ends of all rooms are all turned on, the indoor temperature Will not meet the design requirements.
Second, the air conditioning cooling and heating load configuration is enough, but the effect is not good
1. The insufficient air volume of the air-conditioning return air system of the air duct machine makes the problem particularly prominent. The main reason is that the area of the return air pipe and the return air inlet is insufficient (unreasonable design). Rectification suggestions: Increase the size of the return air duct and return air outlet, or increase the return air duct and return air outlet.
2. The air supply and return air are short-circuited, that is, the air-conditioning air sent from the air supply port has not yet reached the air-conditioning area of the room, and then flows to the return air area.
3. For the sake of convenience and economy, the air pipe uses an overly long metal hose. When the wind speed in the metal hose is greater than 3m/s, the wind resistance in the pipe will increase rapidly, and the wind pressure of the indoor fan of the domestic central air conditioner is small. If its available wind pressure cannot overcome excessive resistance, its actual air volume will be much lower than the rated air volume.
3. During installation, the condensate pipe system is smooth, and dripping phenomenon is found during operation or after a period of operation
1. There is no spring washer at the upper and lower nuts of the boom when the indoor unit is suspended. When the device vibrates its nut during operation, the internal unit tilts in the opposite direction of the condensate tray, causing condensate to flow from the drip tray The upper mouth directly overflows.
2.The spacing of the condensate pipe support and hanger is too large, and the strength of the hanger is not enough; especially when there is no support hanger or the support hanger is too far from the elbow at the elbow where the horizontal pipe is connected to the riser. The riser pushes up, causing the condensate pipe to reverse. Therefore, when installing the air conditioning condensate pipe, we must pay great attention to the reliability of the pipe stiffness and slope.
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