Variable Refrigerant Flow

Introduction to Variable Refrigerant Flow

How it works? 

A VRF system is a heating and cooling system that uses refrigerant to transfer heat between indoor and outdoor units. The system consists of an outdoor unit that contains the compressor and condenser coil, and multiple indoor units that contain the evaporator coil and fan. Refrigerant is circulated between the outdoor and indoor units through refrigerant lines, with each indoor unit able to operate independently of the others. The system can adjust the flow of refrigerant to each individual indoor unit based on temperature needs, allowing for more precise temperature control.

Who first invented this unit? 

The first VRF system was developed in Japan by Daikin Industries in the 1980s.

Major producers and brands for this unit? 

Some major producers and brands of VRF systems include Daikin, Mitsubishi Electric, Fujitsu, LG, Samsung, Carrier, and Trane.

Major preventive and corrective maintenance activities done on this unit 

Some major preventive and corrective maintenance activities for VRF systems include cleaning or replacing air filters, cleaning the evaporator and condenser coils, checking refrigerant levels, inspecting electrical connections and controls, and lubricating moving parts.


The cost of a VRF system can vary widely depending on factors such as brand, capacity, and features. Generally, prices range from several thousand dollars for a basic system to tens of thousands of dollars for a larger, more advanced system.

Capacities range 

VRF systems come in a variety of capacities, typically measured in tons. Capacities can range from around 1 ton for a small residential unit to over 100 tons for a large commercial system.

Advantages and disadvantages 

Advantages of VRF systems include their energy efficiency, ability to provide both heating and cooling, and flexibility in zoning and temperature control. Disadvantages include their higher upfront cost compared to some other systems, the need for professional installation and maintenance, and the potential for refrigerant leaks.

Where it is used mostly? 

VRF systems are commonly used in commercial buildings, such as offices, hotels, and retail spaces, where precise temperature control and zoning capabilities are desired. They are also used in larger residential buildings, such as multi-story houses or apartment buildings. VRF systems can be a good option for buildings with varying heating and cooling needs throughout the year, as well as for buildings with limited space for ductwork or outdoor units.

in MEP
Variable Refrigerant Flow
Administrator January 28, 2024
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