1. XAS 375 CD6 Compressors Committed to sustainable productivity
Scott Ellinger
Committed to sustainable productivity

2. Technical Specifications - XAS 375 CD6

3. Technical Specifications - XAS 375 CD6

4. Product Nomination Oil Injected Compressors
Nomination and grouping
Principle data
Compressor systems
Running conditions
Electrical system
Instrument panel
Engine supplier
C : Caterpillar
D : Deutz
J : John Deere
Y : Yanmar
K : Kabota
Working principle
A : Single stage compressor
R : Two stage compressor
Product range
X : Oil injected
portable compressor
Silencing
: Un-silenced
S : Silenced
Prime mover
d : diesel engine
E : electric motor X A T S
375 C D
Capacity (FAD)
Liter/sec CFM (US-version)
Working pressure
: standard pressure psi
T : “ten” pressure psi
H : high pressure psi

5. Compressor systems Air system Oil system Regulating system
Four major components :
Air system
Oil system
Regulating system
Electrical system

6. Air system
The following slides explain how the regulating system of the XA(H)S works. They will give you an overview of the different parts and their function.

7. Air system
Air filter Compressor Element (AFCE) (with vacuator valve VV, Safety Cartridge SC and vacuum indicator VI)
Unloading Valve (UV)
Compressor Element (CE)
Temperature Switch (TS)
Check Valve (CV)
Air Receiver (AR)
Non Return Valve
Minimum Pressure Valve (MPV)
Air Outlet Valve (AOV)

8. Air filter centrifugal dust separation paper filter element
Filtration of the inlet air in 3 stages :
centrifugal dust separation
paper filter element
safety cartridge (optional)
Vacuum indicator gives an indication when the pressure drop over the filter element is too high  filter element needs to be replaced

9. Air filter Centrifugal separation Air inlet Vacuum indicator
Filter element
Dust
to compressor element

10. REGULATING SYSTEM REG VALVE
Spring loaded
Adjusting receiver pressure
by changing spring tension
to pressure gauge and loading valve
to speed regulator
to unloading valve
Regulating pressure:
Receiver pressure
In order to regulate the pressure inside the reciever tank of our compressor, the air intake and the engine speed have to be controlled. This is done pneumatically. For that reason, we need regulating pressure. The regulating valve reduces the pressure inside the tank, thus providing the regulating pressure. This regulating pressure is then supplied to the unloader valve and the speed regulator or RPS.
The air receiver pressure can be set to another value by adjusting the spring tension of the regulating valve. This is done by turning the handle on top the valve. Increasing the spring tension, by turning in, will increase the regulating pressure and consequently the pressure inside the vessel. Turning out will decrease the pressure.
Regulating Valve Service Kit –

11. Unloading valve Open position at load condition => Air consumption
Opens and closes the air inlet to the compressor element.
Open position at load condition => Air consumption
Closed position at no load condition => No air consumption.
Control of the valve by regulating pressure.

12. Unloading Valve or Air System Inlet Valve
Legend
Receiver Pressure
From Pressure Regulator right now very low to zero pressure
Spring loaded in the open
position
Control Air closes the inlet
Also serves as check valve
Unloading valve service kit –

13. No-Load Condition Load Condition

14. Unload Condition Blow- Down Condition

15. AIR SYSTEM MIN PRESS VALVE
Maintains a minimum pressure
of 58 PSI for oil flow
Also contains the final check
valve

16. OIL SYSTEM
The following slides explain how the regulating system of the XA(H)S works. They will give you an overview of the different parts and their function.

17. Oil System (old style) Air receiver Oil cooler Oil filter
Nomination and grouping
Principle data
Compressor systems
Running conditions
Electrical system
Instrument panel
Air receiver
Oil cooler
Oil filter
Compressor element
Oil separator
Scavenge line
The following slides explain how the regulating system of the XA(H)S works. They will give you an overview of the different parts and their function.

18. Oil System (new style) Air receiver Oil cooler Oil filter/TBV
Compressor element
Oil separator
Scavenge line
The following slides explain how the regulating system of the XA(H)S works. They will give you an overview of the different parts and their function.

19. Oil injected screw compressors

20. Compressor element
Greasing to the bearings
Air inlet
Oil
Air/Oil

21. Oil injected screw compressors
Oil is used for :
Cooling : compression heat is absorbed by the oil
Lubrication of rotors, bearings, gears
Sealing between rotors and rotor and housing
Corrosion protection of the internal metal parts

22. Oil injected screw compressors
Oil is injected in the bottom of the rotor housing,
on the bearings and gears

23. Compression principle
Suction
Compression start
Delivery
Compression

24. Oil separator Scavenge line Separator element Centrifugal separation
Oil Separator filter element should be replaced
Every 1,000 hours or yearly.
Centrifugal separation
Oil
Air/Oil

25. Oil Separator Separator Element Service Kit – 1604 0386 83
Classic Reasons For Oil Carryover
Over filled receiver
Plugged scavenge line
Wrong type of oil (no anti foam agent)
Shut down with air outlet valves open
Scavenge tube installed improperly
Separator Element Service Kit –

26. Control Panel

27. Starting and Stopping Instructions
Start Up: Open a discharge ball valve. Once the engine is running, the valve can be closed and the unit run until warm.
After warm up, press the load button. Engine speed will increase and the unloader valve will open and the unit will build air pressure.
Pressure Setting: Standby pressure should not exceed 120 psi. Unit is designed to deliver 375 CFM at 100 psi.
Stopping: Close all air discharge ball valves. Depress the load button and the engine will continue to run as the air pressure in the system slowly bleeds off.
Turn off compressor. Unloader valve will bleed off remainder of air pressure from the tank.

28. Schematic – XAS 375 CD6

29. Maintenance – XAS 375 CD6

30. Preventive Maintenance Filter Kits – XAS 375 CD6

31. Contact Numbers Main Number Atlas Copco Technical Support
Option 3
Clayton Jones - Hurricane Boosters/Compressors - Supervisor
direct & mobile
Andrew Stevenson – Compressors: Low Pressure
direct & mobile
Will Hudson – Generators/Compressors
Ext & mobile
Andrew Calendar – Compressors: High Pressure
direct & mobile
Jon Monaco - Hydraulic Att./Handheld Tools
Ext & mobile
Brandon Dyer – Compressors: Low Pressure/Hydraulic Att.
direct & mobile
Scott Ellinger – Compressors
direct & mobile

32. Committed to sustainable productivity.