4 Operating instructions
4.1 Operating precautions
Precautions
Never operate the unit without its ventilation hood. Place the compressor as level as possible;
however, it can be operated with an angular deviation, consult your supplier.
- Only start and stop the compressor with its ON/OFF switch, this to avoid starting against back-
pressure.
- The compressor will only run after starting if the pressure in the air receiver is below the pre-set
pressure.
- The start frequency should not be more than 20 starts per hour. To decrease the start frequency
increase the pressure difference between starting and stopping pressure. See section Pressure
switch.
- If the overload protection has cut out:
On single-phase units, turn the ON/OFF switch on the air pressure switch to position OFF to
release the pressure between compressor and check valve. Switch off the voltage and remedy
the trouble. Allow the motor to cool down before restarting.
On three-phase units, turn the ON/OFF switch on the air pressure switch to position OFF. Switch
off the voltage and remedy the trouble. Reset the overload protection. Allow the motor to cool
down before restarting.
- Take care that no dust or paint is taken in by the motor fan.
4.2 Operating
Before initial start up
- Connect the unit electrically. See section Electrical connections.
- Lay out the condensate drains from the air receiver drain (Da).
Starting and stopping
Starting:
- Switch on the voltage.
- Open the air outlet valve.
- Switch start/stop switch to position ON.
- On units with air receiver, close the condensate drain valve.
Turn the handwheel of the pressure reducer clockwise to increase or anti-clockwise to decrease
the outlet pressure at the valve on the pressure reducer.
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Instruction book
2920 7002 03 31
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