2. Open the user's shut-off valve between the machine and the air distribution network.
3. After approx. 10 minutes of operation: Check the cooling oil level and top up if necessary.
4. Switch off the machine and check visually for leaks.
10.15 Changing the cooling oil
Drain the oil completely from the following components:
■ Oil separator tank
■ Thermostatic valve (Option W1)
Always change the oil filter and oil separator cartridge when changing the oil.
Compressed air helps to expel the oil. This compressed air can be taken either from the compres‐
sor itself or from an external source.
An external source of compressed air is necessary in the following cases:
■ The machine is not operational.
■ The machine is to be restarted after a long period of standstill.
The machine must be isolated from the compressed air network and completely vented be‐
fore undertaking any work on the pressure system.
Material Cooling oil
Cooling oil receptacle
The maintenance hose with hose coupling and shut-off valve is stowed beneath the oil separator
tank.
CAUTION
There is risk of burns from hot components and oil!
➤ Wear long-sleeved clothing and gloves.
10 Maintenance
10.15 Changing the cooling oil
74
Service Manual Screw Compressor
ASK T SIGMA CONTROL BASIC 9_5717 20 E
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