22
Feature
Mitsubishi Electric technical manager Johann
Willemse and marketing director Marco Ferdinandi .
RACA Journal there are space restrictions or a special materials requirement . These units are designed to meet the exact requirements of a given project and can include a staggering array of options and accessories on each project .
“ Custom units generally are not certified because of their unique nature . Their designers must rely on the accuracy of the component manufacturer ’ s data and the design expertise of the manufacturer to assemble them into a functional unit . AHI- Carrier does not offer these types of units . Local manufacturing companies like HC Heat-Exchangers and Systemair specialise in them ,” says Mlangeni . suit the job requirements . The designer must understand the function of each component in order to arrange them in the proper sequence for the application . In addition to traditional catalogues , some manufacturers offer computer selection software that facilitates the configuration and selection of a unit , along with detailed engineering drawings and data for submittal and ordering purposes ,” he adds .
Manufacturers do not keep stock of central station units but produce them as ordered due to their variety and complexity .
“ A third type of units are custom AHUs . These units are used where standard unit designs cannot easily be applied , like where
MAIN FUNCTIONS OF AN AHU In addition to managing the proper ventilation of the interior with outside air , the AHU performs other functions :
• Filtration and control of the quality of the air that will reach the interior , thanks to the air purification filters , and depending on the retention of these filters , the air will be clean .
• Control of the air temperature that regulates the airconditioning system in cold or hot , so that the thermal sensation in the interior is the desired one .
• Relative humidity monitoring for greater indoor comfort .
22
RACA Journal I March 2024 www . refrigerationandaircon . co . za