Operation Manual
RENNER Compressors
2 Machine Description
2-8
2.3 Compressor unit (contd.)
Oil scavenge sight gauge / oil scavenge non-return valve
(contd.)
The oil scavenge non-return valve prevents the oil separator
cartridge from being flooded with oil flowing back from the air
end when the compressor is swtiched off.
Oil filter
The replaceable oil filter purifies the compressor oil. It is
screwed onto the return nipple by hand. The filter mesh is 5-
10µm.
Combistat
The Combistat is a temperature indicator and control unit. It is
integrated in the instrument panel. It monitors the maximum
permissible operating temperature of the unit which is set at
110°C (red mark).
When this temperature is reached the circuit is broken and the
unit cuts out automatically.
The line (capillary) connecting the Combistat to the compressor
unit must not be kinked as this will break the contact.
Safety valve
The safety valve is fitted on the separator tank in front of the oil
separator cartridge. It limits the maximum pressure occurring in
the unit to 1-2 bar above the relevant operating pressure
(discharge pressure). The safety valve blows off if the discharge
pressure is exceeded due to a fault in the system.
Description
Compressor unit
components
(contd.)
