Fan coils. Assortment and variations of application. «Chiller-fan coil» system.

The fancoil, or fan coil, is an integral part of the «chiller-fancoil» system. Simply put, a fan coil is an indoor unit.

Fancoils consist of a water heat exchanger and a fan. They are used both for air conditioning and heating, working with any heat source that heats water (heat pump, boiler, etc.).

One of the main advantages of fan coil units is their versatility and a wide range of plug-ins and options.

Fancoils are divided into two types:

- 2-pipe;

- 4-pipe.

A 4-pipe fan coil unit is a fan coil unit with an additional heat exchanger, which is designed for heat operation, given that the temperature of the heat carrier for the additional heat exchanger must be sufficiently high, since this heat exchanger is usually much smaller in area than the main one.

This type of fan coil units is used in the classical scheme – «chiller-fan coil/boiler room», where the chiller works for the first body exchanger, and the boiler room for an additional one. Thus, each user in the room where the fan coil unit is installed can independently choose the operating mode (cold or warm) and the desired temperature, while there is no additional hydraulic heating circuit (for example, radiators) at the facility.

According to the types of execution, fan coil units are divided into the following types:

- cassette;

- wall;

- channel;

- floor-ceiling, they are also wall-mounted or universal, used for flush mounting in the wall.

The range of control panels for fan coil units is simply huge: wall-mounted wired models, remote controls, simple (without indicators), touch controls with color displays and Wi-Fi control, various dispatching protocols, etc. And most importantly, you can connect a remote control to any fan coil unit any manufacturer. This is an undoubted advantage in the operation of fan coil units.

In the event of equipment failure, the user receives full interchangeability of components. At any time in the «chiller-fan coil» system, you can replace the fan coil with any other without being tied to a specific manufacturer.

The «chiller-fan coil» system can be built according to one of two options – with a constant or variable hydraulic regime.

Constant hydraulic mode – a scheme in which the entire volume of heat/coolant circulates at a constant flow throughout the system. At the same time, the main pumps are not regulated, the connection of fan coil units is desirable with the help of 3-way valves that cut off the flow of water to the fan coil heat exchanger when it is turned off.

Variable hydraulic mode is a more complex scheme, but it has its own advantages, which are expressed in a more stable balancing of the system, and above all, it is saving on electricity consumption, which is spent on the operation of main pumps. The main pumps in such a scheme must be frequency-controlled, and access to the fan coil heat exchanger can be blocked using a 2-way valve.