The types of fan coil units include: horizontal concealed fan coil units (with return air box), horizontal concealed fan coil units (without return air box), horizontal concealed fan coil units, vertical concealed fan coil units, vertical concealed fan coil units, card-type two-outlet fan coil units, card-type four-outlet fan coil units and wall-mounted fan coil units.
There are two types of fan coil units: vertical and horizontal. The installation form is open and concealed. According to its air outlet mode, it can be divided into three types: top air outlet, oblique air outlet and front air outlet. According to its water inlet mode, it can be divided into three types: left water inlet, right water inlet and rear water inlet.
The distinction between vertical and horizontal is mainly for concealed fans. Objective The open-mounted fan coil produced in our country is generally vertical. It is mainly installed under the windowsill and is widely used. Horizontal concealed fan coil is a vertical concealed lying unit, which is different from vertical in structure. Horizontal concealed fan coil is usually hoisted on the ceiling of the room, with cold air from top to bottom and return air outlet located at the other end of the ceiling.

Vertical open-mounted fan coil.
Open installation and concealed installation are divided according to the structure type of fan coil. Open installation is to place the fan coil in the visible part of the room, while concealed installation is to place the fan coil in the invisible part of the room, usually under the window sill, on the greenhouse or in the wall.

Horizontal concealed fan coil.
The top air outlet, oblique air outlet and front air outlet all refer to the air supply direction of the vertical fan coil unit. The horizontal air outlet direction is horizontal. The top air outlet direction is vertical and upward, I .e. cold (hot) air is blown upward at the top of the fan coil unit. The oblique air outlet direction is 45 degrees from the horizontal direction. The cold (hot) air blown out is oblique and the front air outlet direction is horizontal and forward.
Left water inlet, right water inlet and rear water inlet.
This refers to the position of the fan coil inlet and outlet pipe on which side of the air conditioner position. The method of judging is: the fan coil facing the top air outlet is viewed downward as the reference, and the fan coil with oblique air outlet and front air outlet is based on facing the air outlet. The inlet and outlet pipes are called left water inlet on the left, right water inlet on the right, and rear water inlet on the rear.
Semi-centralized air conditioning system: in addition to the central air conditioning room, the room is equipped with terminal devices (secondary equipment).
Typical: fan coil + fresh air system.

Fan coil fan coil unit.
1, the system structure.
The fan coil unit is composed of fan, coil and shell.
The fan coil unit makes the indoor return air of the fan coil unit directly enter the unit for cooling, dehumidification or heating treatment.
The water pipes connected to the fan coil are:
(1) Water supply pipe.
(2) Return pipe.
(3) Condensate pipe.
Thinking: What is the spatial position of the three water pipes.
Automatic exhaust valve is set at the highest point of water supply and return pipeline, and local highest point is also required.
Condensate pipes shall be collected and discharged to the floor drain, sewage basin and condensate riser in kitchen and toilet.
Where possible, the cold water inlet temperature should be increased and the hot water inlet temperature should be reduced as much as possible.
The cold water inlet temperature of the fan coil is generally 7 ℃ ~ 10 ℃, and the temperature rise of cold water is 5 ℃.
Hot water inlet temperature is generally 50 ℃ ~ 60 ℃.

Adjustment.
Generally, it is air volume adjustment (adjusting the input voltage of the one-way capacitor speed regulating motor), and water volume adjustment is also used.
There is also a regulating valve bypass damper to regulate the room temperature.
Fresh air supply mode.
1. The negative pressure formed by indoor prediction and other exhaust air naturally penetrates into the fresh air.
Pros: Initial investment and running cost economy.
Disadvantages: poor indoor health conditions, indoor temperature field is not uniform.
Application: indoor fan coil less people, less demanding occasions.
2, the wall hole into the introduction of fresh air directly into the unit.
If the fan coil is installed on the outer wall, this method can be used.
Although the fresh air volume can be guaranteed, the management is troublesome. The new air outlet will damage the building facade and increase pollution and noise.
Applicable: Not demanding buildings.
In order to save energy, the fan coil unit with total heat exchanger shall be set, and the external wall shall be provided with two air outlets of fresh air and exhaust air.
3, by an independent fresh air system for fresh air.
The scheme improves the flexibility of the adjustment and operation of the system, and the temperature of the water supply into the fan coil can be appropriately increased, the condensation phenomenon of the water pipe can be improved, and the most widely used.

Mixing mode of fresh air and fan coil:
(1) Fresh air and fan coil air supply are independently sent into the room.
(2) fresh air and fan coil air mixing.
(3) The fresh air is mixed with the return air of the fan coil.
When designing the fan coil system plus the fresh air system in 5.3.12 of the GB50189-2005 of "Public Building Energy Saving Design Standard", the fresh air should be directly sent into each air conditioning area, and should not be sent out after passing through the fan coil unit.
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