VRV IV Water Cooled - Heat Pump/Heat Recovery (RWEYQ-T)

Refrigerant R410A

Daikin VRV IV Water Cooled (VRV IV-W) is an individual air conditioning system that utilities water as a heat source. In this unique system, water is piped from a central cooling tower or boiler to the compact VRV IV-W unit (the equivalent of the outdoor unit/condenser in a conventional air conditioning system) and after heat exchange, refrigerant is piped from the VRV IV-W unit to each indoor unit.

This unique system allows this condenser to be placed inside the building, which greatly extends design flexibility and makes it easier to adapt to creative building facades where air cooled VRV solutions are not possible. Furthermore VRV IV-W can perform as a heat pump or heat recovery system to suit the requirements of most commercial applications.

Technical Specifications / Documents

(BIM) Engineering Data Links Capacity Dimensions (IU) Max Pipe Length Level Difference Weight
Outdoor Unit TC HC SC H W D OU-IU OU-IU (kg)
(kW) (kW) (kW) (mm) (mm) (mm) (mm) (m) OU
RWEYQ6TY1S 16.0 - 18.0 1000 780 550 - - 146
RWEYQ8TY1S 2.4 - 25.0 1000 780 550 - - 146
RWEYQ10TY1S 28.0 - 31.5 1000 780 550 - - 147
RWEYQ12TY1S 33.5 - 37.5 1000 780 550 - - 147
RWEYQ14TY1S 38.4 - 43.0 1000 780 550 - - 292
RWEYQ16TY1S 44.8 - 50.0 1000 780 550 - - 292
RWEYQ18TY1S 50.4 - 56.5 1000 780 550 - - 293
RWEYQ20TY1S 56.0 - 63.0 1000 780 550 - - 293
RWEYQ22TY1S 61.5 - 69.0 1000 780 550 - - 294
RWEYQ24TY1S 67.0 - 75.0 1000 780 550 - - 294
RWEYQ26TY1S 72.8 - 81.5 1000 780 550 - - 439
RWEYQ28TY1S 78.4 - 81.5 1000 780 550 - - 440
RWEYQ30TY1S 84.0 - 94.5 1000 780 550 - - 441
RWEYQ32TY1S 89.5 - 101.0 1000 780 550 - - 441
RWEYQ34TY1S 95.0 - 107.0 1000 780 550 - - 441
RWEYQ36TY1S 101.0 - 113.0 1000 780 550 - - 441

Note: For Maximum Piping Lengths and Level Differences please refer to VRV brochure located on the BIM platform.

Key Features & Technology

... ...
VRT Technology

VRT automatically adjusts refrigerant temperature to individual building and climate requirement, thus further improving annual energy efficiency and maintaining comfort.

Compact Design

Condensers are compact 780x550x1,000mm (WxDxH), lightweight - 146kg (16kW class) and can be double-stacked to minimize spatial requirements

Low Sound Level

Condensing unit sound level as low as 49dB(A)

Continuous Operation

Continuous operation for cold climates, delivering comfortable heating performance with no defrost

Self-Diagnostic Auto Check Function

The advanced self-diagnostic auto-check function detects malfunctions, immediately displaying the fault type and location so it can be resolved quickly and effectively

Controller Compatibility

Connects to all advanced Daikin Control Solutions including I-Touch Controller and I-Touch Manager

Integration Interfaces

Can be integrated to Open Protocol Building Management Systems via the Daikin BACnet® and LonWorks ® interfaces

Advanced Features for easy installation and superior reliability

  • VRV IV-W features a pump interlock function, controlling the heat source pump in parallel with the starting of the VRV IV-W unit, significantly simplifying operation and management of a buildings air conditioning system.
  • VRV IV-W uses DIII-NET - Daikin's proprietary high speed transfer protocol. DIII-NET means all indoor units, VRV IV-W units and control systems can share common wiring, making installation easier.
  • VRV IV-W can also be easily connected to existing third party BMS systems via Daikin DIII Net.
  • VRV IV-W includes an auto address setting function and check function to detect and flag wiring and piping connection errors, for easier installation.
  • Water piping goes only to the VRV IV-W unit, with refrigerant piping run in occupied spaces.  This means there is virtually no risk of water leakage or corrosion damaging interior fit out.

Centralised Interlocking Function

Centralised interlocking input operate by using an external control adaptor (DTA104A62).

Using one external control adaptor circuit board makes centralised interlocking input to multiple units within the same water system possible.

Easily Responds to Simultaneous Heating and Cooling Needs

By adding suction gas piping and a BS unit (sold separately), simultaneous cooling and heating operation can be provided by a single system.

* For indoor units used for cooling only (do not connect
to BS unit when using for heat recovery), total capacity index must be 50% or less than the capacity index of the outdoor units.

Water-Side Infrastructure & Components

  • A water loop system is routed around the building, either vertically or horizontally.
  • Heat Injection (Boilers) and Rejection (Cooling Tower or Dry Coolers) are required to ensure that the water loop remains between the required design conditions of 10-45°C.
  • VRV IV-W condensers are connected to the water loop and the connecting refrigerant circuit serves indoor units the same as any air cooled VRV system.

The following Water Side components are required:

  • Strainer (Mandatory)
  • Flow Switch or Differential Pressure Switch (Mandatory)
  • Pressure and temperature gauges
  • Circulation Pumps

Cooling and Heating

Daikin offers 2-stage heat recovery operation.The first stage of heat recovery operation is within the refrigerant system.By controlling the BS unit that switches cooling and heating, simultaneous cooling and heatingoperation is made possible, with heat recovery performed between indoor units.The second stage of heat recovery operation is within the water loop, where heat recovery isperformed between the VRV IV W systems.This 2-stage heat recovery operation substantially improves energy efficiency and makes thesystem the ideal solution to the requirements of modern office buildings, where some areasmay require cooling even in winter, depending on the amount of sunshine received and thenumber of people in the room.

STAGE 1: Between Indoor Units

Simultaneous heating and cooling operation within the refrigerant system.

In mainly cooling, partly heating mode, the system recycles heat exhausted from the cooling operation to use for heating. In mainly heating, partly cooling mode, the system uses cooled post-heating operation refrigerant for cooling. Efficiency improves the more simultaneous operation is performed.

STAGE 2: Between

Heat recovery operation between the VRV IV W systems.

Heat recovery operation is also available between systems connected to the same water loop, with systems exchanging heat via water. This increases energy efficiency.

Innovative Water Cooled Technology

Daikin water cooled VRV air conditioning systems offer a viable alternative to water-source heat pump solutions. Each connected indoor unit can provide heating or cooling independently to suit zone requirements, making these systems suitable for both open plan spaces and individual zones with varying temperature requirements.

  • Brazed plate heat exchanger
    Refrigerant-to-water heat transfer is accomplished using a high efficiency, brazed plate heat exchanger. Water pressure drop through the heat exchanger is minimized, and an industry leading water temperature range allows for entering water temperatures as low as 15°C in cooling and heating. The brazed plate heat exchanger also enables a much more compact design over other types of heat exchangers, contributing to VRV-WIII's small footprint.
  • High efficiency compressor
    Daikin’s unique scroll compressor minimizes heat loss and is driven by a high efficiency motor to achieve significant energy efficiencies.
  • Smooth sine wave DC inverter
    By adoption of the Sine Wave, which smooths the rotation of the motor, operation efficiency is greatly improved.
  • Integrated water loop control
    An integrated operational output allows the water cooled VRV-WIII system to energize and de-energize pumps or open and close isolation valves when the system is not in operation.  An integrated flow proving input provides an interface for a water loop flow meter to ensure the system’s compressors do not operate if there is a loss of flow in the water loop.
  • Compact design
    The water-cooled VRV-WIII design is based on a modular concept; all water-cooled condensers are of the same dimensions, and are available in 22kW and 27kW modules.  With a footprint of only 0.43 metres square, a height of only 1,000mm, and the ability to stack modules, an 80kW system requires only about 0.95 square metres of floor space.

Contact a Daikin Sales Engineer

A Daikin Sales Engineer will assess and plan the right air conditioning solution for you, with creativity and sensitivity to the needs of your family or business.