4 Operating instructions
4.1 Initial start-up
If the compressor has not run for the past 6 months (at initial start-up check the date on the data plate), it is
strongly recommended to improve the lubrication of the compressor element: drain the oil, refill the
compressor with the same oil while turning the crankshaft.
It is strongly recommended to install an interstage drain kit, to remove excess condensate, on LT compressors
with a load factor less than 20% per hour. Consult Atlas Copco.
1. For Tank-mounted and base mounted units, remove the transport brackets from underneath the
compressor.
2. Check the electrical installation, which must be in accordance with the instructions given in Electrical
connection.
3. LT are filled with Piston Fluid compressor oil. Check that the oil level is still at the top of the red circle
of sight-glass (SG).
4. Switch on the voltage. Start the motor.
5. On LT 15 and LT 20 compressors, check for correct direction of rotation as indicated by the arrow on the
fan housing.
If the rotation direction is wrong, switch off the voltage and reverse two of the input line connections.
6. Check the operation of the air pressure switch. See sectionAdjustment of MDR4S pressure switch or
Adjustment of MRD3 pressure switch. Check the operation of pilot valve (RV) on LT Trolley. See section
Adjustment of pilot valve.
4.2 Starting
LT
1. On LT check the oil level, which must be at the top of the red circle of sight-glass (SG). The minimum
level is the lower part of the red circle.
2. Switch on the voltage.
3. Turn the switch to position I (Auto), or turn switch (S1) to position I.
Instruction book
2920 7089 90 49
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