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2920 1521 00 28
3 OPERATING INSTRUCTIONS
Safety precautions
The operator must apply all relevant safety precautions, including those mentioned in this book.
Outdoor/altitude operation
If the compressor is installed outdoors or if the air inlet temperature can be below 0 °C, precautions
must be taken. In this case, and also if operating at high altitude, consult Atlas Copco.
Before initial start-up
For SF Multi read section 8 to familiarize yourself with all regulator functions.
3.1 Initial start-up
1. Remove the red painted transport brackets:
- for SF Multi remove brackets (2-Fig. 5.1)
- for the other variants remove the brackets (one on each side of the frame)
2. For SF Multi check the settings of the overload relays (Q21, -22, -23, -24 - Fig. 1.14).
3. Connect the compressor electrically. See section 2.3.
4. Close the condensate drain valve: valve (1-Fig. 1.9 on SF Multi) or the valve underneath the air
receiver, if provided.
5. Switch on the voltage. Start and stop the compressor. On 3-phase compressors, check for
correct direction of rotation (arrows are provided on the motors). If the rotation direction is wrong,
switch off the voltage and reverse two incoming electric lines.
3.2 Starting
3.2.1 Multi
1. Open air outlet valve (3-Figs. 1.5/1.6).
2. Switch on the voltage.
3. Close condensate drain valve (1-Fig. 1.9).
4. Press start button (1-Fig. 1.11). The compressor starts running and automatic operation LED (8-
Fig. 1.11) lights up.
5. The regulator will automatically stop and start compressor modules, depending on the air
pressure.
6. On SF Full-Feature, the nominal pressure dewpoint will be reached after a few minutes.
3.2.2 Skid - Tank-mounted - Twin
1. Open air outlet valve (2-Figs. 1.2/1.4).
2. Switch on the voltage.
3. Check that the condensate drain valve underneath the air receiver (if installed) is closed.
4. Move switch (2-Fig. 1.10) to AUTO. The compressor starts running.
5. The drive motor(s) will automatically stop and start, depending on the air pressure.
Note: The maximum number of compressor starts is 30 per hour.