6. Reference
6 - 3
valve
Capacity Regulating
Refrigerating
Compressor
thermometer
Evaporation
air outlet
Compressed
air inlet
Compressed
After cooler
Fan motor
Drain outlet
Drain separator
Heat exchange
Capillary tube
Press.switch
Condenser
Fan motor
6.5 Pneumatic and refrigerant circuits and their functions
Pneumatic circuit
Humid hot air entering air dryer is cooled in the cooler. At this time, the condensate is separated
from the air by the drain separator and automatically discharged. The dry air is heated by the
re-heater until it gets about the same temperature as that of ambient air. It is then discharged from
air dryer outlet.
Refrigerant circuit
The HFC gas contained in the refrigerant circuit is compressed by the compressor, and cooled and
liquefied by the condenser. When passing through the capillary tube, the HFC gas is regulated and
its temperature decreases. While passing through the cooler part, it evaporates rapidly, taking the
heat from the compressed air, and is sucked in by the compressor. The capacity regulating valve
opens when the compressed air has been cooled sufficiently, and prevents condensed water from
being frozen by excessive cooling.
