VRF system is a type of air conditioning system that uses a single outdoor unit to supply refrigerant to multiple indoor units (also known as fan coil units or FCUs). The indoor units can be of different types (ceiling-mounted, floor-mounted, wall-mounted, etc.) and can be individually controlled, allowing for different temperature zones. VRF systems are designed for medium to large buildings, such as office buildings, hotels, and shopping centers, and are highly efficient, quiet, and easy to install.
On the other hand, a fan coil system is a type of HVAC system that uses a fan and a coil to cool or heat the air. The fan coil unit is usually mounted on a wall, ceiling, or floor, and is connected to a central chiller or boiler. Fan coil systems are designed for smaller spaces, such as individual rooms or small apartments, and are generally less efficient than VRF systems. Fan coil systems can also be used as part of a larger HVAC system, such as a central air conditioning system, to provide additional cooling or heating to certain areas.
In summary, VRF systems are designed for larger commercial or industrial spaces, while fan coil systems are designed for smaller residential or commercial spaces. VRF systems are highly efficient and can be individually controlled for different temperature zones, while fan coil systems are less efficient and are often used as part of a larger HVAC system.