S-SERIES:
■ S-Series SIGMA compressor cooling oils are synthetic lubricants.
■ S-Series SIGMA compressor cooling oils are formulated from the most advanced synthetic lu‐
bricants. These ”synthetic” lubricants begin as high quality petroleum feed stock. They are then
refined, processed and purified into fluids with very consistent molecular structure. These oils are
carefully blended to produce extremely consistant lubricants with superior properties. SIGMA
synthetic lubricants feature all the advantages of both PAO and diester fluids.
■ S–460 lubricant is recommended for compressors operating in ambient temperatures between
40 °F and 105 °F.
Specialty KAESER LUBRICANTS:
■ S–680 lubricant may be used when ambient temperatures are always between 70 °F and 105 °F.
■ FG–460 synthetic hydrocarbon based food grade lubricant is designed for use in rotary screw
compressors in the application where incidental food contact may occur with the discharge air.
This lubricant meets the requirements of the FDA Regulation 21 CFR §178.3570 and is
USDA H–1 approved and NSF certified. FG–460 is approved for canning, food packing, meat and
poultry processing and other applications where incidental food contact may occur.
2.13 Cooling oil Volume
The charge of cooling oil for machines with heat recovery is increased by the volume of oil in
the heat exchanger and connecting lines.
SX 3
SX 7.5
Total charge [gall]
3.2
3.2
Topping up volume [quart]
(minimum–maximum)
0.13
0.13
Tab. 14 Cooling oil charge
2.14 Power Supply
Basic requirements
The machine is designed for an electrical supply according to National Electric Code (NEC) NEC–
670, particulary NFPA 79, edition 2007, section 4.3. In the absence of any user-specified alternatives,
the limits given in these standards must be adhered to. Consult manufacturer for any other specific
power supply.
Three-phase
Do NOT operate package on any unsymmetrical power supply. Also do NOT operate package on
power supplies like, for example, a three-phase (open) delta or three-phase star with non-grounded
neutral.
The machine requires a symmetrical three-phase power supply transformer with a WYE configuration
output as shown in Figure 2 and Figure 3. In a symmetrical three phase supply the phase angles and
voltages are all the same.
Other power supplies are not suitable.
2
Technical Data
2.13 Cooling oil Volume
8
Service manual Screw compressor
Aircenter SX 3/7.5 SIGMA CONTROL BASIC
Number: 9_6945 01USE