As the end device of the central air conditioning system, fan coil is widely used in many public places. Its main features are as follows: self-contained unit, flexible adjustment, small fan coil body, flexible layout, convenient installation, less building space, and easy to cooperate with interior construction.

According to the different needs of the owners, combined with the design drawings, to the actual project, should fully consider the following points:
1, the cold quantity of the check.
Generally, the products are selected according to the calculated cooling load, but it should be noted that different fresh air supply methods will lead to different load cooling capacity of the fan coil unit. When the fresh air is directly sent to the room through the outer wall, the cooling capacity of the fan coil unit = indoor cooling load without heat and humidity treatment. When an independent fresh air system is set up, the cooling capacity of the fan coil unit = indoor cooling load, at present, the products in the market are generally nominal cooling capacity, while the cooling capacity in actual operation should be cooling capacity × average operating time per unit time, I .e. changing the operating time or air volume will affect the input cooling capacity of the unit, so it is not that the higher the nominal cooling capacity, the better. If the fan coil only selects the unit according to the high cooling capacity, the cooling capacity will be too large, resulting in too low opening rate, reduced air exchange times and increased room temperature gradient, it will also increase the system capacity and equipment investment, increase the energy consumption of air conditioning, and reduce the effect of air conditioning. Therefore, the cooling capacity is only one of the necessary conditions for selecting equipment, and other factors should be taken into account.
2, air volume check.
The air change rate is checked mainly according to the room quality requirements. The smaller the air supply temperature difference is, the more the air change rate is, the better the air quality is and the more comfortable it is. Why do some air-conditioned rooms feel peculiar smell and stuffiness, that is, the air volume check is not handled properly? Since the nominal air volume of the fan coil is measured under the working conditions of no water flow and zero air inlet and outlet pressure difference, there are some unrealistic factors, therefore, the actual determination of air volume is to deduct this part of the ideal state of the air volume value, through empirical calculation, this part of the supplementary air volume should account for 20-30% of the nominal air volume.
3, send, return air way.
The air supply and return mode forms the so-called air flow organization, which directly affects the uniformity and stability of the temperature field and velocity field of the air-conditioned room, that is, the air-conditioning effect of the fan coil unit. Reasonable air flow organization requires a certain air supply speed to avoid short circuit of air flow, so as to ensure a certain jet length. The wind speed depends on the external static pressure, air supply volume, air supply outlet and other factors, the range is reduced, the room is uneven between cold and heat, and there is a big difference between the design airflow organization and the actual operation state on the graph. Therefore, the fan coil model should be selected according to the actual building pattern, room structure, depth, height and other conditions, and the medium air volume and wind speed index should be selected accordingly. At present, the external static pressure value of the fan coil in the market is not uniformly calibrated by various manufacturers, which is quite different, in addition, some construction sites use horizontal concealed units with external short air pipes, filters, inlet and return air grilles with large resistance values. Therefore, in actual ordering, the external static pressure value of the machine is determined to be 30Pa, and some rooms even choose units with 50Pa external static pressure value, which is greater than the regular resistance value of about 20Pa. Therefore, a good uniform field is ensured in actual operation and the expected air conditioning effect is achieved.
4, other factors.
Fan coil.
A. the noise index is controlled below 40dB, and the fan coil with large noise is equipped with muffler treatment device, and the resistance value is not more than 10Pa.
B. During installation and construction, attention shall be paid to heat preservation quality, condensate discharge, slope direction, pipe fittings and system cleaning.
c. The setting mode of water system is horizontal system or vertical system. The vertical system is selected in some construction sites, which can better ensure the discharge of condensed water and the floor height requirements of the room.
Several common reasons why the fan coil cannot be started.
1. The power supply is not sent. Confirm that the power supply has been sent.
2. External circuit disconnection confirms that the power supply and control circuits are intact.
3. Electrical wiring errors are checked according to the instructions on the wiring nameplate.
4. The line metal connector is not in good contact with the metal pressure plate of the wiring base to rewire.
5. Loosen the wiring plug of the motor on the wiring base and insert the plug according to the instructions of the wiring nameplate.
6. Contact the after-sales department with the open circuit of the motor lead wire, and it is not allowed to disassemble and inspect the motor without authorization.
7. The motor capacitor wiring is open or the capacitor is damaged. The internal winding of the motor is open.
Shandong Xingheng Environmental Technology Group Co., Ltd. is located in Luquantun Development Zone, Dezhou, Shandong Province, the hometown of glass fiber reinforced plastic in China. The company has three-level qualification for construction mechanical and electrical installation engineering, three-level qualification for environmental protection engineering, and safety production license. It is the first in the industry to pass ISO9001 quality management system certification, ISO14001 environmental management system certification, OHSAS18001 occupational health management system certification, an axial fan invention patent, a fan utility model patent, EIA, three at the same time waiting for complete procedures