Fan coil selection steps.
Clarify the type, specification and air outlet position of the unit selected for the fan coil unit.
1) in the selection of fan coil refrigeration unit, is the design of the preheating load and unit sensible heat load matching, in most cases, the coil has enough latent heat capacity, can meet the design needs, such as the use of outdoor air is the corresponding repair.
2) heating: usually according to the selection of refrigeration units, heating capacity is sufficient, the heat is in accordance with the same water flow to select, that is, with the inlet water temperature to meet the indoor heating load.
3) Refrigeration: indoor preheating and cooling load, indoor total heat and cooling load, inlet air temperature, inlet water temperature, and air volume.

Determine the fan coil unit specifications, water volume, required water temperature and pressure drop and other parameters.
1) It is clear whether the fan motor bearing adopts oil-containing or non-fan coil oil bearing. If oil-free bearing is selected, it shall be regularly refueled according to regulations during use.
2) Make clear the left or right outlet direction of the receiving pipe of the selected unit (related to pipeline layout, etc.).
3) The inlet cold water temperature of the fan coil unit should not be lower than 5 ℃, otherwise it may cause condensation of the unit. In winter, the water temperature is generally not more than 60 ℃, which can reduce scaling and reduce the alternating effect of cold and heat. The expansion force of the tube is weakened and the heat transfer is affected.
4) Pay attention to the insulation measures of the water, so as to avoid condensation and deface indoor buildings when used in summer.
5) The air release valve is set at the highest point of the unit coil. The above two items are essential in the purchase of fan coil.

Fan coil classification and parameter performance.
According to the form: horizontal concealed installation, horizontal open installation, vertical concealed installation, vertical open installation, card type five.
Fan coil according to the thickness: ultra-thin, ordinary type.
Press with or without condensate pump: ordinary type, luxury type.
According to the static pressure of the unit: 12Pa,30Pa,50Pa (external static pressure).
According to the number of rows of pipes: two rows of pipes and three rows of pipes.
According to the standard: two controls, four controls.
The rows mentioned by the fan coil refer to the number of rows of copper tubes of the fan coil surface cooler. Generally, the second row is two rows of copper tubes, with 8 tubes in each row, totaling 16 copper tubes. The third row is three rows of copper tubes, with 8 tubes in each row, totaling 24 copper tubes. The more copper tubes, the better the cooling effect.
Two controls: ordinary fan coil cold water cooling in summer and hot water heating in winter.
Four controls: more used in some of the more luxurious places, can take hot and cold water at the same time, that is, according to the needs of some rooms cooling, some rooms heating.

See the impact of changes in the number of fan coils on performance.
Fan coil supply and return water temperature difference is certain. When the water supply temperature rises, the refrigerating capacity decreases. According to statistics, when the water supply temperature rises by 1 ℃, the refrigerating capacity decreases by about 10%. The higher the water supply temperature, the greater the decrease and the dehumidification capacity.
The water supply conditions are certain. When the air volume of the fan coil changes, the refrigerating capacity and the enthalpy difference of air treatment change with the change. Generally, the refrigerating capacity decreases, the enthalpy difference increases, and the power consumption of the fan per unit refrigerating capacity changes little.
When the temperature difference between the inlet and outlet of the fan coil increases, the amount of water decreases, the heat transfer coefficient of the heat exchange coil decreases, and the heat transfer temperature difference also changes. Therefore, the cooling capacity of the fan coil decreases with the increase of the temperature difference between the supply and return water. According to statistics, when the temperature difference between the supply and return water increases from 7 ℃ to 7 ℃, the cooling capacity can be reduced by about 17%.
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