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Instruction book
1 LEADING PARTICULARS
1.1 General description
MD are adsorption-type air dryers, designed to remove moisture
from compressed air delivered by Atlas Copco ZE45 up to
ZE132, ZR45 up to ZR750, ZR160 VSD up to ZR900 VSD,
ZT18 up to ZT250, ZR/ZT3, ZR4, ZR5 and ZR6 compressors.
The main component is a rotor (6-Fig. 1.3), made of a material
which adsorbs water.
The rotor rotates slowly and is passed by two air flows: a flow
of cool, wet compressed air to be dried and a flow of hot
compressed air to regenerate the drying material.
An ejector (11-Fig. 1.4) is fitted in the air inlet chamber of the
dryer. The regeneration air system includes a throttle valve (8-
Fig. 1.4) and a regeneration air cooler (17-Fig. 1. 4), which can
be either air- or water-cooled. MD50, MD100, MD200,
MD300, MD400, MD400 VSD, MD600 and MD800 VSD are
air-cooled dryers; MD100 W, MD200 W, MD300 W, MD400
W, MD600 W, MD1000 W , MD1800 W, MD400 W VSD,
MD800 W VSD, MD1300 W VSD and MD2500 W VSD are
water-cooled dryers.
Each dryer is provided with a data plate including the type,
serial number and maximum permissible working pressure.
Drying circuit
The cool, wet compressed air passes through three quarters of
the rotor. The moisture of the compressed air is adsorbed by
the drying material.
Regenerating circuit
Hot air, from upstream of the compressor aftercooler, is blown
through one quarter of the rotor and regenerates the drying
material.
Pressure vessel
The dryers include a cylindrical pressure vessel, which is
installed vertically on a frame.
The bottom comprises the rotor drive assembly. The body
includes the electric motor driven rotor and is divided into two
compartments, one for the hot regeneration air and one for the
air to be dried.
The pressure vessel is equipped with two valves (1 and 2-Fig.
1.2) for measuring the pressure difference between the
regeneration air inlet sealing sector and dry air compartment.
1 Safety valve
2 Inlet pipe, hot regeneration air
3 Air inlet valve
4 Control panel
5 Inlet pipe, wet compressed air
6 Electronic Water Drains (EWD)
7 Rotor motor with incorporated gearbox
8 By-pass valve
9 Dry compressed air outlet
10 Air outlet valve
Fig. 1.1 Installation example of ZR110 Pack/MD300 W compressor/dryer package
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12
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