Leading Particulars; General Description; Markings; Operation - Atlas Copco CD2 Bedienungsanleitung

CD2 – CD3 – CD6
Safety during use and operation
1 To lift an air dryer, all loose or pivoting parts shall first be securely fastened.
2 Lifting acceleration and retardation shall be kept within safe limits.
3 No external force may be exerted on the air valves, e.g. by pulling on hoses or by
installing auxiliary equipment directly to a valve.
4 Close the compressor air outlet valve before connecting or disconnecting a hose.
Ascertain that a hose is fully depressurized before disconnecting it.
When blowing through a hose or air line, ensure that the open end is held securely. A
free end will whip and may cause injury.
Never play with compressed air. Never apply it to your skin or direct an air stream at
people. Never use it to clean dirt from your clothes. When using it to clean down
equipment, do so with extreme caution and use eye protection.
5 Wear ear protectors when environmental noise can reach or exceed 90 dB(A). Beware
of long-time exposure to noise.
6 Periodically check that:
– all safety equipment is in good working order,
– all hoses, cables, wiring and/or pipes are in good condition, secure and not rubbing,
– there are no leaks,
– all fasteners are tight,
– all electrical leads are secure and in good order,
– air outlet valves and manifold, hoses, couplings, etc. are in good repair, free of wear
or abuse.
Safety during maintenance and repair
Maintenance and repair work shall only be carried out by adequately trained personnel; if
required, under supervision of someone qualified for the job.
1 Use only the correct tools for maintenance and repair work.
2 Before removing any pressurized component, effectively isolate the compressor from
all sources of pressure and relieve the entire system of pressure. Do not rely on non-
return valves (check valves) to isolate pressure systems.
3 Never weld on, or in any way modify, pressure vessels.
4 Special service tools are available for specific jobs and should be used when
recommended. The use of these tools will save time and prevent damage to parts.

LEADING PARTICULARS

General description

The CD air dryers are built to remove moisture from compressed air
for industrial purposes. All units are designed for indoor use.
An overview of the main parts of the 10.5 bar dryer is given in figure
1a:
1 .....Tower A
2 .....Tower B
3 .....Timer
4 .....Silencer
5 .....Moisture indicator
An overview of the main parts of the 16 bar dryer is given in figure 1b:
1 .....Tower A
2 .....Tower B
3 .....Timer
4 .....Silencer
5 .....Moisture indicator
4
6 .... Dataplate
7 .... Pilot valve
8 .... Control valve
9 .... Power supply (cable gland)
6 .... Dataplate
7 .... Solenoid valve
8 .... Power supply connector with
fuse

Markings

A brief description of the markings provided on the unit is given
hereafter. Refer to figure 2:
1 .....A high voltage is present.
2 .....Air outlet.
3 .....Air inlet.
4 .....Attention (yellow LED)
5. ....When the indicator is brown/green, the dryer is ready for
operation. When clear/white, the desiccant needs to be
reactivated.

OPERATION

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-setted 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 via
the inlet. 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.
A small portion of the dried air does not leave the dryer immediately
via the outlet but is expanded to atmospheric pressure and flows
downwards through the other tower, regenerating the desiccant.
This regenerating air is finally released via the silencer.
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 (at the outlet). If this indicator shows brown/green,
the desiccant will guarantee a proper operation. If it shows clear/
white, the desiccant needs to be regenerated.
NOTE: This statement is only applicable to 10.5 bar versions. The 16
bar versions use different colour code (orange - clear)

Pneumatic diagram

Figue 3a shows the pneumatic digram of the 10.5 bar dryer units:
A .... Tower A
B .... Tower B
CV . Check valve
Figue 3b shows the pneumatic digram of the 16 bar dryer units:
A .... Tower A
B .... Tower B
CV . Check valve
EL .. Exhaust left
ER . Exhaust right
M.... Motor
1..... Connection 1
2..... Connection 2
IL.... Inlet left
IR ... Inlet right
N .... Nozzle
S .... Silencer
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