in fact, the air duct fan

in fact, the air duct fan is actually a central air-conditioning system driven by one. Air duct fan and ordinary hanging machine comparison: the price is slightly higher, the internal unit installed on the ceiling is more beautiful, only fixed frequency, no frequency conversion. Air duct fan and round duct machine central air conditioning comparison: the price is cheap, an internal unit corresponds to an external unit, only fixed frequency, no frequency conversion. Today, the central air conditioning maintenance network editor to share with you the common maintenance knowledge of air duct fan. installation precautions of air duct fan the air duct needs good heat preservation, otherwise there may be condensation water. In addition, the following points should be paid attention to in the design of air duct: 1. The ultra-thin air duct fan is designed with zero static pressure and can not be connected to the air duct in the project. 2. Due to the large resistance of circular flexible air duct, square duct made of iron sheet or composite material shall be used as far as possible, and circular locfome flexible air duct shall not be used as far as possible. 3. Only 12KW and 14kw models with high static pressure (unit thickness is 300 mm) can be connected with circular flexible air duct, and other units cannot be connected with circular flexible air duct. 4. The diameter of the circular flexible air duct for engineering installation must be more than φ 200 mm. Straighten it as far as possible, shorten the length of the air duct, reduce the resistance of the air duct, improve the air volume of the unit, and ensure the use effect of the unit. 5. Soft connection between air duct and air outletThe canvas should not be too long (200 ~ 300 mm) to prevent the canvas from distortion and increase the resistance of air supply and return. 6. Canvas should be sealed tightly to prevent air leakage of the unit. 7. Air supply canvas duct cutting machine needs to be insulated to prevent cold leakage and condensation; heat leakage affects the use effect. 2. Maintenance knowledge points of common faults of air duct fan 1. Compressor noise the higher the operating frequency, the higher the noise; when the compressor is abnormal, there are different abnormal noises such as reverse rotation, cylinder sticking, internal mechanical wear and motor damage. 2. The motor noise there is a certain electromagnetic noise when the motor is running normally, but the electromagnetic noise will increase when there is abnormal. 3. Air duct noise the air at the air outlet rubs against the grille and the air deflector, which will not be loud, unless the structure is deformed or there are foreign matters. 4. Vibration noise of wind blade there is natural frequency between the wind blade and the motor bracket. If the speed of the wind blade is synchronized with the natural frequency, resonance will be generated. In general, the design will avoid the natural frequency to set the speed. When the wind blade is deformed or damaged, its natural frequency may be changed to make abnormal noise after sale. 5. Abnormal noise of structural components under normal circumstances, the motor bracket, shell and other structural parts should not make abnormal noise. If abnormal response is found, check whether it is deformed or the screw is loose, so that they can knock each other to produce abnormal noise. 6. Refrigerant noiseSound the liquid refrigerant will have a certain liquid flow sound, but if there is abnormal throttling, or the valve body cannot be closed, it will produce a larger liquid flow sound; another situation is that the gaseous refrigerant blows to the foreign matters in the pipe, resulting in howling.