Installation; Positioning; Piping; Electrical Wiring - Atlas Copco CD7 Bedienungsanleitung

INSTALLATION

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.
– When the compressor has NO built-in waterseparator, a
waterseparator has to be installed before the CD dryer, in order
to prevent free water from entering the dryer.
CD7, CD12, CD17, CD24 and CD32:
– Fix the unit as level as possible to the wall. Make sure the fixating
screws are tightened firmly.
– Provide enough space around the unit to install and service the
filter elements.
CD44 and CD60:
– 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.
If the filters are mounted directly on the dryer, the dryer should be
positioned higher to enable servicing of the filter elements.

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 4, 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 the residual water and oil droplets from the air
entering the dryer.
F2........Compressed air afterfilter DD
To remove possible dust particles coming 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....Waterseparator (optional)
To prevent free water from entering the dryer.
!
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.
2904 0105 04
Concerning the piping, following checks should be carried out:
– 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.

Electrical wiring

The electrical wiring must comply with the local regulations. The air
dryer must be earthed and protected by fuses against short-circuiting.
The four connectors of the timer module (refer to figure 5) have the
following function:
P1 ....... Power supply connector
Provides the general power supply to the unit.
P2 ....... Power supply connector of solenoid valve 1
Provides power supply to solenoid valve 1.
P3 ....... Power supply of solenoid valve 2
Provides power supply to solenoid valve 2.
P4 ....... Remote control connector
Allows the connection between the dryer and the compressor
for remote control of the dryer (refer to § Operation).
!
Before switching on the main power supply, check the volt-
age requirements in the technical specifications or on the
dryer's data plate.

OPERATING INSTRUCTIONS

!
In your own safety interest, always observe all relevant
safety instructions.
!
Some of the components mentioned in the operating
instructions were not mentioned before in this manual, e.g.
external inlet valve and external outlet valve. Refer to the
chapter "Installation – Piping" for more detailed information.

Initial start up

To start up the dryer for the first time or after a long period of standstill,
proceed as follows:
1. If installed, open the bypass valves of the dryer.
2. Cut off the air supply from the compressor towards the dryer by
closing the external inlet valve.
3. If installed, close the external outlet valve.
4. Start the compressor and wait for pressure.
5. Slowly open the external inlet valve.
6. Check the connections of the dryer for air leaks and repair if
necessary.
7. Switch the dryer on by putting S1 in position I.
8. Let the dryer operate for several hours with the external outlet
valve closed. Check that the moisture indicator turns blue.
9. Gradually open the external outlet valve.
10. As required, close the bypass valves of the dryer.
!
If the application allows air that is not dried optimally, the
valve towards the air consumer may be opened even when
the moisture indicator is not completely blue. In this case, it
will take more time for the desiccant to dry completely and
for the moisture indicator to turn blue.
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