Atlas Copco Screw Air Compressor ZR250

Check the oil level. Refer to Before starting

Drain condensate from the air receiver, if installed

Check for leaks. Tighten leaking connections and replace damaged/leaking parts

Stop the compressor. Press the emergency stop button

Switch off the voltage and follow the LOTO procedure

Remove filler plug (FC). Drain the compressor sump by opening drain valve (Dmo). On ZR compressors, drain the oil cooler by opening drain valve (Dmc). On ZT compressors, fit a proper flexible over the extension of drain plugs (Dmc). Drain the oil system by loosening the drain plugs. Close the drain valves and tighten the drain plugs after draining

Remove the oil filters (OF). Clean the filter seats, oil the gaskets of the new filters and screw the filters into place until the gaskets contact the seats. Then tighten by hand

On ZR 110 up to ZR 275, fill the compressor sump to the middle of the oil level sight-glass (SG). On ZT 110 up to ZT 275, fill the compressor sump to the maximum mark of the oil level sight-glass

Switch on the voltage. Unlock the emergency stop button and reset the oil and oil filter service warnings

Run the compressor for a few minutes

Drain the aftercooler drain receiver

Drain the intercooler drain receiver

On Full-Feature compressors, drain the drain receivers of the internal dryer, and additional aftercooler for energy recovery units

Warning: Never run the compressor without safety valves. No adjustments are allowed.

Valve tested on a separate compressed air line

Enter the pressure at which the valve opened

Did the valve open at the pressure specified in Settings of safety valves?

If the valve did not open at the specified pressure, describe the issue

Sign off on the safety valve testing

Replace the demister sponge of the integrated dryer

Sign off on the maintenance procedure