BeaconMedaes dMED 7 Instruction Book page 17

Instruction book
Reference
1
2
3, 4
5
6
Operation principle (version without purge control)
The operation cycle of the dryer is repetitive and is controlled by a factory-set timer, programmed in the
central controller.
While the desiccant in one tower dries the compressed air, the desiccant in the second tower is being
regenerated. Regeneration of the desiccant is achieved by means of purge air from the drying tower.
The compressed air entering the dryer is led to one of the towers by means of the inlet selector valve. The
position of the selector valve depends on the condition (activated or not) of the solenoid valves. While the air
flows upwards through the tower, the desiccant adsorbs the water vapour and the compressed air is dried.
The dried air leaves the dryer via the outlet selector valve.
A small portion of the dried air passes a nozzle (5), expands to atmospheric pressure and flows downwards
through the other tower, regenerating (drying) the desiccant.
The regeneration air is released via the solenoid valve and the silencer of the regenerating tower. The solenoid
valves are controlled by the timer.
After a pre-set period, the function of the towers is reversed. The fully regenerated tower will now dry the
air, while the desiccant in the other tower will be regenerated.
By default, the regeneration timer will restart from the beginning of the cycle in case of a power failure during
operation.
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Dryer flow diagram
Designation
Air inlet
Inlet selector valve
Desiccant tower
Purge nozzle
Outlet selector valve
Reference Designation
7 Air outlet
8, 9 Solenoid valve
10, 11 Silencer
PI Pressure gauge
15