For capacities more than 120 TR, centrifugal compressors are used. The more recent additions have been the rotary and screw compressors that are more efficient than the others. The condenser liquefies the refrigerant gas by a heat exchange process. The capillary tube or the expansion valve pressurizes the liquid refrigerant and meters its flow to the evaporator. The refrigerant then passes through the evaporator coils which extracts heat out of the ambience.
Manufacturing is a fabrication and assembly operation.
The other important components forming part of an AC system viz. The players in the room AC segment assemble various bought out parts that are basically manufactured by small-scale units. Such outsourcing of materials has its own compulsions. A strong vendor base, an excellent vendor rating system and strict quality control are some of the requisites. CAL has, thus, decided to go in for a serious indigenization drive.