Woodview Construction

Located in Whenuapai, West Auckland is the brand new headquarters for Woodview Construction. With the objective to design a building targeting a Green Star NZ Rating, a more environmentally-friendly, energy efficient HVAC system was essential for this facility.

The Challenge

eCubed was engaged as the mechanical consultant to design a new headquarters for Woodview Construction that met the requirements to obtain accreditation under the Green Star NZ Industrial Tool V3. The target was to achieve a 5 Green Star Building Rating from the criteria outlined on the New Zealand Green Building Council website.

The Mitsubishi Electric Solution

Hybrid VRF offers next-generation energy efficiency with reduced carbon emissions

High COP City Multi Hybrid VRF (HVRF) was an ideal solution in support of the targeted Green Star NZ Built Rating for this new facility.

The use of PURY-EP High COP outdoor units allows the system to operate with lower energy consumption than standard units while also providing exceptional seasonal performance. As this system uses inverter compressors, the outdoor unit is able to ramp up and down to provide the required capacity in real-time. As a result, energy use is decreased as they only work as hard as needed.

Water rather than refrigerant is at the heart of the indoor units, reducing the overall charge and need for leak detection systems

As HVRF primarily uses water as the medium between the branch controller and indoor units, the total amount of refrigerant present in the system is drastically decreased; which in turn, lowers its potential emissions. Furthermore, the need to mitigate refrigerant leaks in each space and add any additional refrigerant in the future is minimised.

VRF performance with hydronic levels of comfort

HVRF systems operate like a chilled water solution but can provide cooling and/or heating to each indoor unit individually. The air-off temperature at each indoor unit is also milder than traditional VRF, therefore improving the thermal comfort for all occupants in any room.

Equipment Breakdown

Total Capacity:

Heating Capacity: 93.5kW
Cooling Capacity: 83.5kW

Outdoor Units

1x PURY-EP300YNW-A-BS High COP VRF Outdoor Unit
1x PURY-EP450YNW-A-BS High COP VRF Outdoor Unit
1x MUZ-GE42VAD2 Single Split Outdoor Unit

Indoor Units:

13x PLFY-WP32VBM-E HVRF Ceiling Cassette Units
4x PLFY-WP40VBM-E HVRF Ceiling Cassette Units
1x PEFY-WP32VMA-E HVRF Ducted Indoor Unit
1x PEFY-WP50VMA-E HVRF Ducted Indoor Unit
1x MSZ-GE42VAD2 High Wall Single Split Indoor Unit

Branch Controllers:

3x CMB-WP108V-GA1 Hybrid Branch Controllers

Wall Controllers:

19x PAC-YT52CRA-K Wall Controllers

Central Controllers:

1x AE-200E Central Controller
1x PAC-YG66DCA-J DIDO Control Module


eCubed Building Workshop Limited


Clarkson Air Conditioning

Published: Wednesday, 29 July 2020

Woodview Construction