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What is VRV / VRF?


Variable Refrigerant Volume


Variable Refrigerant Flow

VRV and VRF are interchangeable terms. These units are usually have several (or many) indoor units powered by a single outdoor compressor. These system are similar to a multi-split systems and can the same internal components as a multi-split. What makes these units different is the outdoor units can run at varying speeds depending on the need, whereas most air conditioning compressors either run at a single speed or are turned off.

VRF units have include an inverter and DC motors which facilitate running at different speeds. Variable compressor motor speed and means variable refrigerant flow. By operating at varying speeds, VRF units work only at the required rate to maintain the environment, allowing for substantial energy savings.

VRF / VRV was invented by Daikin in 1982 but these days most air conditioning manufacturers offer VRV / VRF units.

VRV / VRF units are suited to big and / or multi-storey homes and commercial applications.

The video below from Daikin explains more:

Daikin VRV IV-S

Daikin VRV Indoor Units

A range of different indoor units can be combined with the VRV outdoor unit to provide the best solution for your home.

Daikin Indoor Unit

Daikin Indoor Unit CTXM-M

Daikin Compact Cassette

Daikin Bulkhead System

Daikin VRV IV-S - Outdoor Unit

An example of a VRV / VRF system is the Daikin VRV IV-S multi-split system system outdoor unit that can be combined with several different type of indoor units. Daikin outdoor units in the VRV residential series range from 9 to 24 KW.

This unit can service up to 14 rooms and be coupled with a wide selection of indoor units to suit a variety of room sizes.

Each indoor unit can also be individually controlled, scheduled and set to the desired room temperature.

Energy Efficient

Running costs are kept low as only rooms requiring air conditioning can be switch on independently.

Compact Footprint

Available in a wide range of capacities whilst maintaining a compact installation footprint with long piping runs of up to 100m (24kW Model).

Intelligent Comfort

Wall mounted indoor units feature Daikin’s Intelligent Eye human sensor that ensures draught free comfort and energy saving operations when the room is unoccupied.

Night Time Quiet Mode

Reduces the outdoor noise levels during sleeping hours and automatically resumes normal operations in the morning.

Ultimate Versatility

As many as 14 indoors can be connected ranging from wall mounted, floor standing, bulkheads, cassettes and ceiling suspended units.

Comfort for Everyone

Each indoor unit can be individually controlled, scheduled and set to the desired room temperature ensuring optimal comfort for all occupants.

Daikin produce a large range of VRV systems aimed at the commercial end of the market. The VRV IV, pictured above comes in a range of different configurations to suit different use cases.

Mitsubishi VRF System

Mitsubishi's VRF systems are perfect solution for large homes or commercial premises.

PUMY-SP series (above) allows up to 12 indoor units to be connected to a single outdoor unit and the reduced height (less than one metre) makes this unit suitable for installation on balconies. The weight reduction makes the unit easier facilitates easier installation and transportation.

The Mini VRF Single Fan PUMY-SP compact design has a 27% reduction in height and 25% reduction in weight, allowing it to be installed in more confined spaces compared to the dual fan model.

For greater versatility, the City Multi S Series system PUMY-P YKM-A/YKM-A features an innovative design that allows up to 10/12/12 indoor units — to be connected to a single outdoor unit.

The City Multi S Series is available in both single phase and 3 phase models, both ranging from 11.2 to 15.5KW.

The Mitsubishi VRF outdoor units can be comnined with a rnage of indoor units to suit every size of romm and every style of house construction.

Mitsubishi VRF System - Features

Mitsubishi's VRFs, have the flexibility to choose the perfect indoor unit for each room. For example, you may want a super quiet, low capacity unit for a smaller bedroom and a stylish, higher capacity unit for the larger living room. Plus, connect these to a single outdoor unit, rather than requiring one for each – saving on outdoor space.

Energy saving - Mitsubishi Electric Inverter Control distributes tempered air in the shortest period of time and ensures that the system operates at ideal capacity, minimising energy wastage.

Individual control - All units on Mitsubishi's multi-split systems allow individual control of air conditioning in each space. This allows you to adjust the temperature to suit comfort levels and ensure that it is only operating when needed.

Quiet operation - Mitsubishi has applied a ‘silent mode’ to these indoor units, ensuring that outdoor sound levels remain as low as possible during operation.

At the purely commercial end of the market Mitsubishi makes a range of large VRF units now with R32 refrigerant. Here is Mitsubishi's City Multi YNW unit in small, medium and large configuration.