Construction World January 2018

HVAC

PwC Tower’s HVAC SOLUTIONS Electric motor and automation solutions provider Zest WEG Group offers a range of state-of-the-art equipment for Heating, Ventilation, Air- conditioning and Cooling (HVAC) solutions, recently making an important contribution to HVAC facilities at PricewaterhouseCooper’s new landmark headquarters in Midrand, Gauteng.

provision of a large stock holding at Zest WEG Group. This will ensure and help the contractor during the year of warranty before the hand- over of the building. Such is the level of commitment that Zest WEG Group will ensure availability of VSD units for each of the frame sizes installed in the installation, covering each of the kilowatt ratings in use. This means equipment downtime will be kept to an absolute minimum, as there will be no delay in supplying the required replacement units. “This is a service solution that we offer readily to any of our customers,” Liebenberg says. While the WEG CFW701 model VSD caters for applications with a power range up to 110 kW, there is also a smaller model in the range – the WEG CFW501– that has been available in South Africa for the past few years and is suitable for applications up to 15 kW. The company’s W22 ‘Smokex’ smoke extraction motor is another popular element of its HVAC offering, installed in conjunction with basement fans and connected to CO 2 sensors for emissions monitoring through VSDs or BMS systems. The units are IEC certified as well as SABS approved. With its in-depth understanding of HVAC requirements, the Zest WEG Group can combine its quality product solutions and years of experience to ensure an offering that is optimal for individual applications. “We can design and implement projects from single product installations right through to individually customised solutions, using the latest technology, and this ensures that the customer achieves the performance and reliability they need without compromising on energy efficiency,” says Liebenberg. “WEG products are engineered

A ccording to Francois Liebenberg, sales engineer: drives at Zest WEG Electric, the company’s offering includes its fit-for- purpose WEG variable speed drives (VSDs) and WEG low voltage switchgear for the control boards, as well as well-respected WEG electric motors. At PwC Tower, Zest WEG Group supplied the WEG CFW701 HVAC-dedicated VSD which meets the HVAC project specification. This VSD also meets the specific criteria for integral fire mode software and features BACnet communication protocol which interfaces with the Building Management System (BMS) and RFI filtering. “This WEG VSD is a perfect solution for fans, exhausters and pumps in a range of applications in hospitals, commercial buildings and shopping malls,” says Liebenberg. “The speed control provided by the drive delivers substantial savings in terms of energy consumption, and also offers comprehensive motor protection.” One of the standout features on the WEG CFW701 is the on-board fire mode functionality. This function disables all the VSD motor protection settings in the event of a fire mode signal being received, allowing the VSD to run until destruction or until conditions return to normal. Liebenberg says that being factory- equipped with RFI filters allows the unit to meet IEC standards on electromagnetic interference. This ensures that the VSDs can be used in an office environment without the risk of interference with other electronic equipment.

Zest WEG Group also supplied WEG low voltage switchgear for the Air Handling Unit (AHU) control panels on each floor of the PwC Tower. This striking new 26 floor building – with its innovative ‘twist’ design – now dominates the skyline at Midrand’s Waterfall City development, being visible from many points in a 30 km radius. Designed to meet the Silver Standard of the international Leadership in Energy and Environmental Design (LEED) ratings, PwC Tower has an air handling unit – or ‘air room’ – on each floor, rather than a centralised facility. “In addition to the built-in benefits and capabilities of WEG equipment, what made our solution even more attractive to the customer was the service that Zest WEG Group committed to provide,” says Liebenberg. During the contract, Zest WEG Group provided a dedicated project engineer who worked with the contractor. This significantly streamlined the working process and allowed any queries related to the VSD to be readily dealt with during the project roll-out and commissioning. “Working directly with the project team, our professional was always on hand to ensure efficiency in the project implementation through better communication, technical advice and quick response times,” Liebenberg says. “We also made a dedicated after-sales technician available to the customer for technical assistance and commissioning.” Added to the high level of service is the

to facilitate a safe and reliable plant environment in the HVAC space.” 

WEG CFW701 IP55 Variable Speed Drives installed to drive the basement pump system at PwC Tower.

WEG CFW701 IP55 Variable Speed Drives and SSW07 Soft Starter installations to control the extractor fan systems.

WEG CFW701 IP55 Variable Speed Drives and control panels for the air handling units located on each floor of the PwC Tower.

46

CONSTRUCTION WORLD JANUARY 2018