User manual

Industrial Air Division
2920 1163 04
24
4.4 Fan control switch on GA Full-feature
The switch (S3-Fig. 9) is factory-adjusted and must be replaced if
the switch-on or cut-out pressure deviates from the values given in
section 6.2.
4.5 High pressure shut-down switch on GA Full-
feature (TÜV-approved units only)
The switch (S7-Fig. 4a) is factory-adjusted and must be replaced if
the shut-down value deviates from the value given in section 6.2.
4.6 Expansion valve on GA Full-feature
The valve (11-Fig. 4a) is a regulator which keeps the evaporator
pressure, and consequently also the temperature, stable. The
valve is controlled by its own outlet pressure. The valve is factory-
set to keep the effective evaporator pressure at no-load at a
minimum of 4.1 bar (59 psi), which corresponds to 1°C (34°F). If
necessary, have the valve adjusted.
Attention:
- To facilitate solving some problems, a number of messages
may appear on the control panel. Examples:
Message Action
System failure Switch off the voltage. Check the
10 or 106 terminals on connector 2X1, emergency
stop button (S3) and the bridge on
terminals 24 for correct connection.
System failure 11 Switch off the voltage. Check for possible
connection with the ground of one of the
digital inputs at connector 2X4.
System failure 104 Switch off the voltage. Check that the
contacts to the digital inputs at the con-
nectors of the module are voltage-free.
Connector 2X5 must only be used for connecting the Atlas
Copco Relay expansion box (optional) which allows indication
of manual/automatic operation, warning condition or shut-down
condition.
- Before starting repairs, press stop button O (9-Fig. 7a), wait
until the compressor has stopped (approx. 30 seconds), press
stop button (S3-Fig. 7a) and switch off the voltage.
Furthermore, apply all relevant safety precautions, including
those mentioned in this book.
- The chart helps to solve mechanical problems. An electrical
fault must be traced by an electrician. Check that the wires are
not damaged and that they are clamped tight to their terminals.
- Consult the User manual for the electronic regulator if a service
message or fault message appears on the display (4-Fig. 7a) or
when alarm LED (3-Fig. 7a) is alight or blinks.
- A yellow-painted blocking device is delivered loose. The device
can be fitted around the closed outlet valve (AV-Fig. 8) to lock
the valve during maintenance or repair works.
- To facilitate some maintenance or repair works, it may be
efficient to remove side panel (4-Fig. 1). For air-cooled
compressors, consult section 4.2. On water-cooled
compressors, removal is possible as long as air cooler (Ca) and
pipe (13-Fig. 2b) remain installed.
Mechanical faults and suggested remedies (Figs. 4)
Explanation of the table below:
- Conditions of the compressor, always preceded by a number,
are printed in bold.
- Each possible fault is followed by its relevant suggested remedy
and both are preceded by the same letter
5 Problem solving