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DRYPOINT
®
RA III
3.3.2
Flow diagram, water-cooled models
3.3.3
Compressed air flow
The hot, humid air enters the heat exchanger [1], cools and reaches a temperature of approximately 2 °C. At
this temperature the humidity present in the air changes to a liquid state, precipitates to the bottom of the
exchanger [1] and is expelled through the automatic condensate drain [21]. The cold, dry air is then
channelled and heated again until it reaches a temperature at the outlet of the exchanger that is
approximately 8°C lower than the temperature of the incoming air.
3.3.4
Refrigerating cycle
The refrigerant compressor [6] compresses the refrigerant fluid and conveys it at high pressure towards the
condenser [8] inside which the gas cools and becomes liquid at high pressure. The liquid refrigerant passes
through the filter drier [10] and the capillary tube [11] where, due to the pressure drop, it reaches the preset
temperature. The low pressure liquid refrigerant enters the heat exchanger [1] and the heat present in the
environment is transferred to the liquid refrigerant causing its evaporation. The low pressure and low
temperature refrigerant fluid then returns to the refrigerator compressor [6] where it is compressed again
and the cycle starts again from the beginning.
In case of low thermal load (use of compressed air at a flow rate lower than the nominal flow rate of the
dryer), the excess refrigerant is automatically diverted from the delivery side by the refrigeration
compressor [6] towards the suction side via the hot gas by-pass valve [7].
Original installa�on and opera�on manual
31 | 118
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