Industrial Air Division
2920 5997 03
8
3 Operating instructions
3.2 Starting
1. On LE/LT, check the oil level, which must be in the lower half of
the sight-glass (7-Figs. 1). Top up, if necessary.
Warning: Never use oil in the crankcase of LEN.
2. Switch on the voltage.
3. On LE/LT5, -6: press start button (S1-I-Fig. 1c) (or turn start
switch).
On LE/LT7 up to -12 and LEN: start the unit and select the
required operating mode (consult section 1.3.2) by means of
selector switch (S1-Fig. 1d).
4. Open the compressor air outlet valve.
3.3 Stopping
1. On LE/LT5, -6: press stop button (S1-O-Fig. 1c) (or turn start
switch).
On LE/LT7 up to -12 and LEN: move selector switch (S1-Fig.
1d) to "O".
2. Close the air outlet valve.
3. Switch off the voltage.
If a compressor with a direct-on-line starter stops during operation
through a power failure, the pressure from the compressor
discharge side must be released by pressing the stop button or
moving the start switch on the air pressure switch to OFF, this to
avoid that the compressor restarts against back-pressure when the
power becomes live again.
Safety precautions
The operator must apply all relevant safety precautions, including
those mentioned in this book.
3.1 Initial start-up
1. Remove the transport brackets (20-Fig. 1d) and wooden
blocks under compressor and motor feet.
2. Check the electrical installation, which must be in
accordance with the instructions given in section 2.1.
3. Check the setting of the thermal overload relay.
4. Star-delta timer (K1-1-Fig. 3) is factory-set between 6 and 10
seconds for LT and LEN units; for LE units, it is set at 20
seconds. Check and adjust if necessary.
5. LE/LT are delivered with P.A.O. (polyalphaolefine)
compressor oil. Check that the oil level is still in the middle
of the sight-glass (7-Figs. 1). Top up, if necessary (see
section 4.2).
Warning: Never use oil in the crankcase of LEN.
6. 1) Switch on the voltage. Start and stop the motor. Check for
correct direction of rotation of the fan as indicated by an
arrow on the crankcase and fan cover. Switch off the voltage
and reverse two of the input line connections if the motor
turns in the wrong direction.
7. Check the operation of the air pressure switch. Adjust, if
necessary (see section 5.4).
1) Only necessary for LE/LT9 up to -12 and LEN.
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