WHK Office Building

A new office building to house all of WHK’s Invercargill staff.

The Challenge

The design brief was to provide a highly energy efficient building and to provide a fresh and comfortable environment for the WHK Invercargill staff all housed under one roof. The air conditioning and ventilation system needed to be able to provide comfort with economy all year round in an environment that sees bitterly cold winters, cool spring and autumn and even some cool days in summer. As well as this there is salt air drift from the sea offering another twist to the equipment selection.

The Solution

City Multi R2 Systems were used throughout the building to provide all of the air conditioning for the WHK office space. There were two areas that were set aside for other tenants which had standard split type units. The server room was also kept to individual split type units to maintain system integrity and also keep install costs in check.

There was a considerable fresh air requirement for this building and to ensure the ‘energy ­efficiency’ theme was carried through, City Multi Y Series condensing units were teamed up with the new AHU controller fitted to a purpose build air handler providing all of the fresh air, pre heated, as there is unlikely to be the need to pre-cool air here!

An AG-150A provides central control functions on this site and with the addition of a DIDO controller also took care of switching the various extract fans too. The site required power logging and power apportionment billing so a TG2000 PC was included. Just to top of the controls there was also a BMS on site so we provided a BACnet interface as well.

Total Capacity

Heating Capacity: 458 kW
Cooling Capacity: 410 kW

Outdoor Units

5 x PURY-YHM-A-BS Heat Recovery Units
2 x PUHY-YHM-A-BS Heat Pump Units

Indoor Units

72 x PEFY-VMH-E Ducted Units

Air Handler Units

2 x PAC-AH250H-J AHU Controller Units

Wall Controllers

1 x PAR-21MAA
72 x PAC-YT51CRB

Central Controller

1 x AG-150A Central Controller
2 x PAC-YG50ECA-J Expansion Controllers
1 x BAC-HD150 Bacnet Interface
1 x TG2000 PC



WHK Office Building