Description; Pneumatic Diagram; Installation; Positioning - Atlas Copco CD100 Bedienungsanleitung

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Description

The construction of the air dryer is simple, reliable and easy to
service. The dryer has two towers containing the adsorbing material
or desiccant. This desiccant is a very porous grain material which can
adsorb large amounts of water vapour.
The operation cycle of the dryers is repetitive and is controlled by a
factory-set timer. While the desiccant in the first tower dries the
compressed air, the desiccant in the second tower is being
regenerated and vice versa. 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 valve which is controlled by the pneumatic actuator.
As the air flows upwards through the tower, the desiccant adsorbs the
water vapours and the compressed air is dried. Once the top of the
tower is reached, the air leaves the dryer via the outlet valve (=
nozzle). The two pressure gauges indicate at all time the air pressure
inside the towers.
A small portion of the dried air does not leave the dryer immediately
via the nozzle valve but is expanded to atmospheric pressure and
flows downwards through the other tower, regenerating the desiccant.
This regenerating air is finally released via the solenoid valve and the
silencer.
A second small portion of the dried air flows via the control air valve,
an air filter and the pressure regulator (only for the 16 bar units) to the
solenoid valves which are controlled by the timer. The air leaving the
solenoid valves (when energized) is used to control the pneumatic
actuator and the pneumatic valves.
After a certain period, the cycle will restart. The fully regenerated
tower will now dry the air whereas the other tower will be regenerated.
The condition of the desiccant can be checked by means of the
moisture indicator. If the indicator shows blue, the desiccant will
guarantee a proper operation. If it shows pink, the desiccant needs to
be regenerated.
In case a power failure should occur during operation or in case the
on/off switch was put in position O, the timer module will restart from
zero. In case the remote control connector P4 was short-circuited, the
dryer will remember the remaining drying time of the unit, continuing
the drying cycle after connector P4 is opened again.
During unload, the outlet valve of the regenerating tower is closed.
That way, the pressure in this tower will increase up to net pressure.
From that moment on, purge air is no longer consumed. During load,
the outlet valve is opened and both towers continue their cycle.

Pneumatic diagram

Figure 4 shows the pneumatic diagram of the dryer:
A.....Tower A
AF ..Air filter
B.....Tower B
CA ..Control air valve
IV....3-way valve
OV ..Outlet valve
(= nozzle valve)
P1...Pressure gauge 1
2904 0106 01
P2 .. Pressure gauge 2
PA .. Pneumatic actuator
PR.. Pressure regulator
(only for 16 bar units)
PV.. Pneumatic valve
S .... Silencer
SV.. Solenoid valve
TV .. Pneumatic valve
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Positioning

It is important to keep the following in mind when installing the dryer:
– Place the dryer at a location where the temperature never
exceeds the limits.
– Provide enough space (approximately 80 cm) around the dryer
for maintenance operations.
– Place the dryer as level as possible and fix it firmly to the
concrete.
– When the compressor has NO built-in water separator, a water
separator has to be installed before the CD dryer, in order to
prevent free water from entering the dryer.

Piping

! When installing the piping, make sure that all pipes are
clean.
To ensure correct operation of the dryer, it has to be fitted properly into
the compressed air system consisting of a compressor, the dryer and
an application.
The recommended installation, as shown in figure 5, can only be used
in case the particular application allows to bypass the dryer.
AR ...... Air receiver
BV....... Bypass valves
Together with the external inlet valve and the external outlet
valve, the bypass valves allow the dryer and the filters to be
serviced while non-dried air flows through the bypass system.
D......... Dryer
EIV...... External inlet valve
To cut off the air supply towards the dryer.
EOV.... External outlet valve
To cut off the air supply towards the air consumer.
F1 ....... Compressed air prefilter PD
To remove water and oil droplets from the air entering the
dryer. In this way, it prevents unnecessary overloading of the
dryer and prolongs the life of the dessicant.
F2 ....... Compressed air afterfilter DD
To remove dust from the desiccant.
F3 ....... Compressed air bypassfilter PD
To protect the compressed air system against dirt, water and
oil in case the dryer is bypassed.
WSD ... Water separator (optional)
To prevent free water from entering the dryer. The water
separator must always be installed in case of 'Standard Pack
Units'.
! Never overload the dryer as it will damage the desiccant. It
may be recommended to install the air dryer upstream of the
air receiver to prevent overload (e.g. after extending the dry
air system). Consult Atlas Copco if in doubt.
Concerning the piping, following checks should be carried out:
– plugs and pipes must be removed before connecting the pipes,
– make sure that all pipes, filters, valves, etc. are clean and are
installed correctly with or without bypass system,
– make sure that no external force is exerted on the piping.
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NSTRUCTION MANUAL
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