www . refrigerationandaircon . co . za RACA Journal I March 2024 21
Feature
Supplied by AHI Carrier
“ AHUS are highly customisable and have countless combinations of filters , coils , fans and other section combinations to meet application requirements . Below is typical in-line and stacked configurations of units that AHI- Carrier can supply ,” he says .
Mlangeni says that the two types of AHUs that AHI-Carrier can offer are packaged and central station units .
Packaged AHUs : Packaged AHUs have a more limited set of options than central station AHUs . They are generally composed of cooling / heating coils , mixing boxes , and discharge plenums . Most often , they are matched to split system condensing units and heat pumps . Several manufacturers provide matched performance ratings with their condensing units .
“ As a result , packaged AHUs are usually classified by nominal cooling kilowattage , rather than airflow . They are typically found in the 20 – 140kW range . They are popular due to their low first cost , ease of selection and installation . In addition , manufacturers generally stock them , so they are good for fast track or emergency replacement jobs ,” says Mlangeni .
Carrier 38ZS / ZF Air Cooled Condensing units that can connect to the 1 or 2 Carrier 48ZS / ZF Indoor Units .
Carrier DBFP Suspended AHU .
Central Station AHUs : Central station units are semi-custom built-up air handlers that offer a wide range of component
Supplied by AHI Carrier Supplied by AHI Carrier
options to cover various application needs for commercial and industrial applications . Carrier central station AHU ranges in size from 0.5 m 3 / s for small single-zone applications , to large air handlers capable of delivering over 50 m 3 / s to constant volume or variable air volume systems . Although the size range is large , the majority of comfort air conditioning applications fall into the 0.5 m 3 / s to 25 m 3 / s size range .
“ To simplify the design process and keep the time required to design , build and deliver the air handler to a minimum , most manufacturers offer a ‘ standard ’ catalogue offering of pre-engineered sizes and components . These components are assembled by the designer in building-block fashion to
Carrier 38ZS / ZF Air Cooled Condenser .
Carrier 40ZS / ZF Indoor Unit .
www . refrigerationandaircon . co . za RACA Journal I March 2024 21