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11 Technical description
11.1 Control panel
The control panel explained below is the only dryer user interface.
1
ON-OFF Switch
2
Electronic instrument
3
Air and refrigerant flow diagram
11.2 Functional description
Operating principle – All dryer models described in this manual function according to the same principle. The hot and
moisture-loaded air is led into an air/air heat exchanger. Afterwards, the air flows through an evaporator, which is also
known as an air/refrigerant heat exchanger. The air temperature is reduced to approximately 36°F (2°C), so that water
vapour condenses to liquid. The continuously accumulating condensate is collected in the separator to be discharged
via the condensate drain. Subsequently, the cold and dry air is led through the air/air heat exchanger, so that it is
reheated to up to 46°F (8°C) below the inlet temperature when leaving the dryer.
Refrigeration cycle – The refrigerant is conducted through the compressor and reaches a condenser under high
pressure. There, cooling-down takes place, making the refrigerant condense to a liquid state which is under high
pressure. The liquid is pressed through a capillary tube where the resulting pressure drop ensures that the refrigerant
evaporates at a defined temperature. The liquid refrigerant which is under low pressure is led into the heat exchanger,
where it expands. The cold resulting from the expansion serves to cool down the compressed air in the heat exchanger.
During this process, the refrigerant evaporates. The low-pressure gas is resupplied to the compressor, where it is
compressed again. It then re-enters the cycle. In phases of a reduced compressed-air load, the excess refrigerant is
resupplied automatically to the compressor via the hot gas bypass valve.
DRYPOINT® RAC 10-480 NA
RAC 10 – 175
1
0
sec - min
Set
1
RAC 220 – 480
I
ON
sec - min
Set
1
DMC15
ON
2
3
DMC15
ON
2
3
Technical description
K
K
21
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