According to the use requirements and building conditions, select the type of fan coil and system layout, determine the fresh air supply mode and water pipe system type.
According to the requirements of the cooling capacity and calculated air volume, the selection of fan coil, but should pay attention to the different working conditions.

Select fan coil:
Generally, it is selected according to the mid-range cooling capacity, check the air volume, and see if the heat is satisfied.
Double water pipe system: a fan coil water system with one water supply and one water return.
Cold water in summer and hot water in winter.
Three-water pipe system: two water supply pipes and one return pipe.
Suitable for air conditioning throughout the year and the building load varies greatly.
Disadvantages: There are mixing losses.
Four water pipe system: two water supply pipes, two return pipes.
Four water pipe system and coil connection mode:
The use of four water control, the initial investment is relatively high, but the operation of the economy.
It is often used in the construction of fan coil buildings with high comfort requirements.
The design of water system and hydraulic calculation and heating pipeline, such as: the necessary slope of the pipeline in order to exhaust, the system set expansion tank.

Regulation control of water system:
Variable water quantity method (area control method according to the direction of zoning is adopted).
Variable water temperature mode (zone control water temperature).
Advantages:.
Flexible layout, room temperature can be adjusted independently.
The air between the rooms does not collude.
Less investment, high flexibility of use.
Disadvantages:.
There are high quality requirements for the production of the unit.
Each fan coil must be connected to a condensate pipe, and its drainage slope may sometimes affect the ceiling arrangement and height, or cause poor drainage slope.
Unless the fresh air system adopts double air volume (or variable air volume), the outdoor wind is rarely used in the transition season.
If the minimum fresh air ratio is operated throughout the year, the indoor air quality is poor.
Because the fan coil has rotating equipment, it is not suitable for use in rooms that can produce gas and dust that cause explosion hazards.
Due to the limitation of noise, the fan speed of the fan coil cannot be too high, so the residual pressure head of the unit is very small, and the airflow distribution is limited. It is suitable for rooms with a depth of less than 6m.

Wind system.
1. The production of the air return box should meet the requirements, the banding should be good, the insulation should be good, and the insulation material should not be damaged during installation.
2. When the return air box is riveted with the fan coil, the return air box must be upright, and must not be distorted or twisted.
3, flange welding should not have leakage welding, holes, flange diagonal error is less than 3mm, flatness error is less than 2mm, flange screw hole and rivet hole spacing is specified as 120mm, flange brush paint must remove welding slag, and then brush the second red Dan.
4, the air duct head adopts socket buckle method, the air nozzle (0.05 meters) adopts riveting, each place should be sealed with sealant fan coil, flange riveting, air duct flanging shall not be less than 6mm, and the four sides should be consistent.
5. The air supply under the air duct must be equipped with a wind deflector, and the air nozzle must have a blunt edge.
6. The installation of the living room air duct is the same for two fan coils. The air duct and the fan coil are connected with waterproof soft canvas, the length is 200mm, and they are crimped with a single flange.
7. For the installation of the air duct in the master bedroom (side-to-side return), the center point of the return air outlet should be on the same plane axis, such as side-to-side return, the return air outlet should be on the same plane.
8. For the fan coil installed on the side of the inclined roof with an elevation of more than 2800mm, a 45-degree (angular bend) air duct shall be installed at the air supply outlet.
9. After the air duct is made, it must be submitted for inspection before heat preservation and installation.
10. When the large side of the main air duct exceeds 1000mm, in-pipe support shall be set at the center of the air duct. When the main air duct exits the machine room and passes through the wall, pipe sleeves shall be set and fire dampers shall be installed.
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