KAESER SK Series User manual

Operating Manual
Rotary screw compressor
SK
901848 21 E
Manufacturer:
KAESER KOMPRESSOREN SE
96410 Coburg • PO Box 2143 • GERMANY • Tel. [phone] • Fax [phone]
http://www.kaeser.com

Original instructions
/KKW/SSK 2.21 en SBA-SCHRAUBEN-SC2IO
/KKW/SSC 2.08
20180629 105600

1 Regarding this document
1.1 Using this document ......................................................................................................... 1
1.2 Further documents ........................................................................................................... 1
1.3 Copyright .......................................................................................................................... 1
1.4 Symbols and labels .......................................................................................................... 1
1.4.1 Warnings ............................................................................................................. 1
1.4.2 Potential damage warnings ................................................................................ 2
1.4.3 Other alert notes and their symbols .................................................................... 2
2 Technical Specifications
2.1 Nameplate ........................................................................................................................ 4
2.2 Options ............................................................................................................................. 4
2.3 Mass ................................................................................................................................. 5
2.4 Temperature ..................................................................................................................... 5
2.5 Ambient conditions ........................................................................................................... 5
2.6 Ventilation ........................................................................................................................ 6
2.7 Pressure ........................................................................................................................... 6
2.8 Flow rate (constant delivery volume relative to intake conditions) ................................... 7
2.9 Cooling oil recommendation ............................................................................................. 8
2.10 Cooling oil charge ............................................................................................................ 9
2.11 Motors and power ............................................................................................................ 10
2.11.1 Compressor drive motor ..................................................................................... 10
2.12 Noise emission [dB(A)] ..................................................................................................... 10
2.13 Electrical connection ........................................................................................................ 11
2.14 Power supply specifications ............................................................................................. 11
2.14.1 Mains frequency: 50 Hz ...................................................................................... 12
2.14.2 Mains frequency: 60 Hz ...................................................................................... 13
2.15 Available heat capacity .................................................................................................... 14
3 Safety and Responsibility
3.1 Basic instructions ............................................................................................................. 15
3.2 Specified use .................................................................................................................... 15
3.3 Improper use .................................................................................................................... 15
3.4 User's responsibilities ....................................................................................................... 15
3.4.1 Observe statutory and universally accepted regulations .................................... 15
3.4.2 Determining personnel ........................................................................................ 16
3.4.3 Complying with Inspection Schedules and Accident Prevention Regulations .... 16
3.5 Dangers ............................................................................................................................ 17
3.5.1 Safely dealing with sources of danger ................................................................ 17
3.5.2 Safe machine operation ...................................................................................... 19
3.5.3 Organisational Measures .................................................................................... 21
3.5.4 Danger Areas ...................................................................................................... 21
3.6 Safety devices .................................................................................................................. 22
3.7 Working life of safety functions ........................................................................................ 22
3.8 Safety signs ...................................................................................................................... 23
3.9 Emergency situations ....................................................................................................... 24
3.9.1 Correct fire fighting ............................................................................................. 24
3.9.2 Treating injuries from handling cooling oil .......................................................... 24
3.10 Warranty ........................................................................................................................... 25
3.11 Environment protection .................................................................................................... 25
4 Design and Function
4.1 Enclosure ......................................................................................................................... 26
4.2 Machine function .............................................................................................................. 27
4.2.1 Safety devices .................................................................................................... 27
4.2.2 Floating relay contacts ........................................................................................ 28
Contents
901848 21 E
Operating Manual Rotary screw compressor
SK i

4.3 Operating panel SIGMA CONTROL 2 ............................................................................. 28
4.4 Operating modes and control modes ............................................................................... 31
4.4.1 Machine operating modes .................................................................................. 31
4.4.2 Control modes .................................................................................................... 32
4.5 Options ............................................................................................................................. 33
4.5.1 SIGMA CONTROL 2 controller: Connection to control technology .................... 33
4.5.2 Machine mountings ............................................................................................. 33
4.5.3 Prepared for external heat recovery ................................................................... 34
5 Installation and Operating Conditions
5.1 Ensuring safety ................................................................................................................ 35
5.2 Installation conditions ....................................................................................................... 35
5.2.1 Determining location and clearances .................................................................. 35
5.2.2 Ensuring the machine room ventilation ............................................................... 36
5.2.3 Exhaust duct design ........................................................................................... 37
5.3 Operating the machine in a compressed air network ....................................................... 37
6 Installation
6.1 Ensuring safety ................................................................................................................ 38
6.2 Reporting Transport Damage ........................................................................................... 39
6.3 Connecting the machine with the compressed air network .............................................. 39
6.4 Connecting the external pressure transducer .................................................................. 39
6.5 Connecting the machine with the power supply ............................................................... 40
6.6 Options ............................................................................................................................. 41
6.6.1 Anchoring the machine ....................................................................................... 41
6.6.2 Connecting the external heat recovery system ................................................... 41
7 Initial Start-up
7.1 Ensuring safety ................................................................................................................ 42
7.2 Instructions to be observed before commissioning .......................................................... 43
7.3 Checking installation and operating conditions ................................................................ 43
7.4 Setting the overload protection cut-out ............................................................................ 44
7.5 Pouring cooling oil into the airend .................................................................................... 44
7.6 Activating and deactivating the MODULATING control .................................................... 45
7.7 Starting the machine for the first time .............................................................................. 45
7.8 Setting the set point pressure .......................................................................................... 46
7.9 Checking the door interlock switch ................................................................................... 46
7.10 Setting the display language ............................................................................................ 47
8 Operation
8.1 Switching on and off ......................................................................................................... 48
8.1.1 Switching on ....................................................................................................... 48
8.1.2 Switching off ....................................................................................................... 48
8.2 Switching off in an emergency and switching on again .................................................... 49
8.3 Using the remote control for switching on and off ............................................................ 49
8.4 Using the timer for switching on and off ........................................................................... 50
8.5 Interpreting operation messages ...................................................................................... 51
8.6 Acknowledging alarm and warning messages ................................................................. 51
9 Fault Recognition and Rectification
9.1 Basic instructions ............................................................................................................. 53
9.2 Other faults ....................................................................................................................... 53
10 Maintenance
10.1 Ensuring safety ................................................................................................................ 55
10.2 Following the maintenance plan ....................................................................................... 56
10.2.1 Logging maintenance work ................................................................................. 56
Contents
ii
Operating Manual Rotary screw compressor
SK 901848 21 E

10.2.2 Resetting maintenance interval counters ............................................................ 56
10.2.3 Regular maintenance tasks ................................................................................ 56
10.2.4 Cooling oil Change interval ................................................................................. 57
10.2.5 Regular service tasks ......................................................................................... 58
10.3 Cooler: Cleaning or Renewing the Filter Mats ................................................................. 59
10.4 Control cabinet: Clean or renew the filter mat .................................................................. 59
10.5 Cooler maintenance ......................................................................................................... 60
10.6 Maintaining the external heat recovery system ................................................................ 61
10.7 Air Filter Maintenance ...................................................................................................... 62
10.8 Compressor motor maintenance ...................................................................................... 62
10.9 Drive belt maintenance .................................................................................................... 63
10.10 Testing the pressure relief valve ...................................................................................... 64
10.11 Check the safety shut-down due to excessive airend discharge temperature. ................ 65
10.12 Check the EMERGENCY STOP control device ............................................................... 65
10.13 Checking the cooling oil level ........................................................................................... 65
10.14 Venting the machine (de-pressurising) ............................................................................ 66
10.15 Replenish cooling oil ........................................................................................................ 68
10.15.1 Venting the machine (de-pressurising) ............................................................... 68
10.15.2 Topping up with cooling oil and trial run ............................................................. 69
10.16 Changing the cooling oil ................................................................................................... 70
10.17 Changing the oil filter ....................................................................................................... 74
10.18 Changing the oil separator cartridge ................................................................................ 75
10.19 Documenting maintenance and service work .................................................................. 78
11 Spares, Operating Materials, Service
11.1 Note the nameplate .......................................................................................................... 79
11.2 Ordering consumable parts and operating fluids/materials .............................................. 79
11.3 KAESER AIR SERVICE ................................................................................................... 79
11.4 Replacement parts for service and repair ........................................................................ 80
12 Decommissioning, Storage and Transport
12.1 De-commissioning ............................................................................................................ 84
12.1.1 Temporary de-commissioning ............................................................................ 84
12.1.2 Long-term de-commissioning ............................................................................. 84
12.2 Packing ............................................................................................................................ 85
12.3 Storage ............................................................................................................................. 85
12.4 Transport .......................................................................................................................... 85
12.4.1 Safety .................................................................................................................. 85
12.4.2 Transport with a forklift truck ............................................................................... 85
12.4.3 Transport with a hoist ......................................................................................... 86
12.5 Disposal ........................................................................................................................... 88
12.5.1 Dispose of the battery in accordance with local environmental regulations. ...... 88
13 Annex
13.1 Pipeline and instrument flow diagram (P&I diagram) ....................................................... 89
13.2 Pipeline and instrument flow diagram (P&I diagram) MODULATING control .................. 95
13.3 Dimensional drawing ........................................................................................................ 101
13.4 Electrical Diagram ............................................................................................................ 104
Contents
901848 21 E
Operating Manual Rotary screw compressor
SK iii

Contents
iv
Operating Manual Rotary screw compressor
SK 901848 21 E

Fig. 1 Maximum relative humidity of intake air ..................................................................................... 6
Fig. 2 Location of safety signs .............................................................................................................. 23
Fig. 3 Enclosure overview .................................................................................................................... 26
Fig. 4 Machine layout ........................................................................................................................... 27
Fig. 5 Keys – overview ......................................................................................................................... 28
Fig. 6 Indicators – overview .................................................................................................................. 29
Fig. 7 RFID reader ................................................................................................................................ 30
Fig. 8 Machine mountings .................................................................................................................... 33
Fig. 9 Recommended machine placement and dimensions [mm] ........................................................ 36
Fig. 10 Compressed air pipework ........................................................................................................... 39
Fig. 11 Charging hole ............................................................................................................................. 44
Fig. 12 Activating and deactivating the MODULATING control .............................................................. 45
Fig. 13 Position of the door interlock switch ........................................................................................... 47
Fig. 14 Switching on and off ................................................................................................................... 48
Fig. 15 Switching off in an emergency ................................................................................................... 49
Fig. 16 Using the remote control for switching on and off ...................................................................... 50
Fig. 17 Using the timer for switching on and off ..................................................................................... 51
Fig. 18 Acknowledging messages .......................................................................................................... 52
Fig. 19 Filter mat for the air and oil cooler .............................................................................................. 59
Fig. 20 Switching cabinet ventilation ...................................................................................................... 60
Fig. 21 Filter mat for the air and oil cooler .............................................................................................. 61
Fig. 22 Air filter maintenance .................................................................................................................. 62
Fig. 23 Drive belt maintenance ............................................................................................................... 63
Fig. 24 Check the EMERGENCY STOP control device ......................................................................... 65
Fig. 25 Checking the cooling oil level ..................................................................................................... 66
Fig. 26 Venting the machine ................................................................................................................... 67
Fig. 27 Replenish cooling oil .................................................................................................................. 68
Fig. 28 Changing the cooling oil, oil separator tank ............................................................................... 71
Fig. 29 Changing the cooling oil Oil cooler ............................................................................................. 72
Fig. 30 Changing the cooling oil, heat recovery system ......................................................................... 73
Fig. 31 Changing the oil filter .................................................................................................................. 74
Fig. 32 Changing the oil separator cartridge .......................................................................................... 76
Fig. 33 Transporting with a forklift truck ................................................................................................. 86
Fig. 34 Transporting with a crane ........................................................................................................... 87
Fig. 35 Battery labelling .......................................................................................................................... 88
List of Illustrations
901848 21 E
Operating Manual Rotary screw compressor
SK v

List of Illustrations
vi
Operating Manual Rotary screw compressor
SK 901848 21 E

Tab. 1 Danger levels and their definition (personal injury) .................................................................... 1
Tab. 2 Danger levels and their definition (damage to property) ............................................................ 2
Tab. 3 Nameplate .................................................................................................................................. 4
Tab. 4 Options ....................................................................................................................................... 4
Tab. 5 Mass ........................................................................................................................................... 5
Tab. 6 Temperature ............................................................................................................................... 5
Tab. 7 Ambient conditions ..................................................................................................................... 5
Tab. 8 Overview Ventilation (50Hz) ....................................................................................................... 6
Tab. 9 Overview Ventilation (60Hz) ....................................................................................................... 6
Tab. 10 Pressure relief valve activating pressure (50Hz) ........................................................................ 7
Tab. 11 Pressure relief valve activating pressure (60Hz) ........................................................................ 7
Tab. 12 Flow rate (50Hz) ......................................................................................................................... 7
Tab. 13 Flow rate (60 Hz) ........................................................................................................................ 7
Tab. 14 Cooling oil recommendation ....................................................................................................... 8
Tab. 15 Cooling oil recommendation (food processing) .......................................................................... 8
Tab. 16 Cooling oil recommendation (machines for snow cannons) ....................................................... 9
Tab. 17 Cooling oil charge (Option K1) ................................................................................................... 9
Tab. 18 Cooling oil charge (Option W1) .................................................................................................. 10
Tab. 19 Compressor drive motor ............................................................................................................. 10
Tab. 20 Compressor drive motor: Rated speed for 50 Hz ....................................................................... 10
Tab. 21 Compressor drive motor: Rated speed for 60 Hz ....................................................................... 10
Tab. 22 Noise emission [dB(A)] ............................................................................................................... 10
Tab. 23 Supply details 200V / 3 / 50Hz ................................................................................................... 12
Tab. 24 Supply details 230V / 3 / 50Hz ................................................................................................... 12
Tab. 25 Supply details 400V / 3 / 50Hz ................................................................................................... 12
Tab. 26 Network conditions at 400V / 3 / 50Hz ....................................................................................... 13
Tab. 27 Supply details 230V / 3 / 60Hz ................................................................................................... 13
Tab. 28 Supply details 380V / 3 / 60Hz ................................................................................................... 13
Tab. 29 Supply details 440V / 3 / 60Hz ................................................................................................... 13
Tab. 30 Supply details 460V / 3 / 60Hz ................................................................................................... 14
Tab. 31 Heat capacity (Option W1) ......................................................................................................... 14
Tab. 32 Inspection intervals according to Ordinance on Industrial Safety and Health ............................ 17
Tab. 33 Danger Areas ............................................................................................................................. 22
Tab. 34 Category and Performance Level ............................................................................................... 22
Tab. 35 Safety signs ................................................................................................................................ 23
Tab. 36 Keys ........................................................................................................................................... 28
Tab. 37 LEDs ........................................................................................................................................... 29
Tab. 38 RFID reader ................................................................................................................................ 31
Tab. 39 Energy-saving control modes ..................................................................................................... 32
Tab. 40 Components ............................................................................................................................... 33
Tab. 41 Re-commissioning after storage/standstill .................................................................................. 43
Tab. 42 Installation conditions checklist .................................................................................................. 43
Tab. 43 Activating and deactivating the MODULATING control .............................................................. 45
Tab. 44 Machine identification ................................................................................................................. 50
Tab. 45 Remote control identification ...................................................................................................... 50
Tab. 46 Machine identification ................................................................................................................. 51
Tab. 47 Other faults and remedies .......................................................................................................... 53
Tab. 48 Advise others that the machine is being serviced. ..................................................................... 55
Tab. 49 Regular maintenance tasks ........................................................................................................ 57
Tab. 50 Cooling oil Change intervals ....................................................................................................... 58
Tab. 51 Regular service tasks ................................................................................................................. 58
Tab. 52 Permissible cooling oil level under LOAD .................................................................................. 65
Tab. 53 Logged maintenance tasks ........................................................................................................ 78
Tab. 54 Consumable parts ...................................................................................................................... 79
List of Tables
901848 21 E
Operating Manual Rotary screw compressor
SK vii

List of Tables
viii
Operating Manual Rotary screw compressor
SK 901848 21 E

1 Regarding this document
1.1 Using this document
The operating manual is a component of the product. It describes the machine as it was at the time
of first delivery after manufacture.
➤ Keep the operating manual in a safe place throughout the life of the machine.
➤ Supply any successive owner or user with this operating manual.
➤ Please insert any amendment or revision of the operating manual sent to you.
➤ Enter details from the machine nameplate and individual items of equipment in the table in
chapter 2.
1.2 Further documents
Further documents included with this operating manual are:
■ Certificate of acceptance / operating instructions for the pressure vessel
■ Declaration of Conformity in accordance with the applicable directive
■ Operating manual for SIGMA CONTROL 2
Missing documents can be requested from KAESER.
➤ Make sure all documents are complete and observe the instructions contained in them.
➤ Make sure you provide the data from the nameplate when ordering documents.
1.3 Copyright
This operating manual is protected by copyright. Any queries regarding the use or duplication of
this documentation should be referred to KAESER. Correct use of information will be fully suppor‐
ted.
1.4 Symbols and labels
➤ Please note the symbols and labels used in this document.
1.4.1 Warnings
Warnings indicate risks potentially resulting in personal injury, if the measures specified are not
taken.
Warning notices indicate three levels of danger identified by the corresponding signal word:
Signal word Meaning Consequences of non-compliance
DANGER Warns of an imminent danger Will very likely result in death or severe injury
WARNING Warns of a potentially imminent dan‐
ger
May result in death or severe injury
CAUTION Warns of a potentially dangerous sit‐
uation
May result in a moderate physical injury
Tab. 1 Danger levels and their definition (personal injury)
1 Regarding this document
1.1 Using this document
901848 21 E
Operating Manual Rotary screw compressor
SK 1

Some warning notes may precede a chapter. They apply to the entire chapter including all sub-sec‐
tions.
Example:
DANGER
The type and source of the imminent danger is shown here!
The possible consequences of ignoring a warning are shown here.
The word "DANGER" indicates that death or severe injury can very likely result from ignoring
the warning.
➤ The measures required to protect yourself from danger are shown here.
Warning notes referring to a sub-section or the subsequent action are integrated into the procedure
and numbered as an action.
Example:
1. WARNING!
The type and source of the imminent danger is shown here!
The possible consequences of ignoring a warning are shown here.
The word "WARNING" indicates that death or severe injury may result from ignoring the warn‐
ing.
➤ The measures required to protect yourself from danger are shown here.
2. Always read and comply with warning instructions.
1.4.2 Potential damage warnings
Contrary to the warnings shown above, damage warnings do not indicate a potential personal in‐
jury.
Damage warnings have only one danger level, identified with this signal word:
Signal word Meaning Consequences of non-compliance
NOTE Warns of a potentially dangerous situation Damage to property is possible
Tab. 2 Danger levels and their definition (damage to property)
Example:
NOTICE
The type and source of the imminent danger is shown here!
Potential effects when ignoring the warning are indicated here.
➤ The protective measures against the damages are shown here.
➤ Carefully read and fully comply with warnings against damages.
1.4.3 Other alert notes and their symbols
This symbol indicates particular important information.
1 Regarding this document
1.4 Symbols and labels
2
Operating Manual Rotary screw compressor
SK 901848 21 E

Material Here you will find details on special tools, operating materials or spare parts.
Precondition Here you will find conditional requirements necessary to carry out the task.
The conditions relevant to safety shown here will help you to avoid dangerous situations.
➤ This symbol is placed by lists of actions comprising one stage of a task.
Operating instructions with several steps are numbered in the sequence of the operating steps.
Information relating to one option only are marked with an option code (e.g., H1 indicates that
this section applies only to machines with bolt-down machine feet). Option codes used in this
operating manual are explained in chapter 2.2.
Information referring to potential problems are identified by a question mark.
The cause is named in the help text ...
➤ ... as is a solution.
This symbol refers to important information or measures concerning environmental protec‐
tion.
Further information Further subjects are introduced here.
1 Regarding this document
1.4 Symbols and labels
901848 21 E
Operating Manual Rotary screw compressor
SK 3
Option H1

2 Technical Specifications
2.1 Nameplate
The model designation and important technical information are given on the machine's nameplate.
The nameplate is located on the outside of the machine:
■ above the cooler, or
■ on the rear of the machine.
➤ Enter here the nameplate data as a reference:
Feature Value
Rotary screw compressor
Material no.
Serial no.
Year of manufacture
Rated power
Rated motor speed
Maximum working pressure
Ambient temperature
Tab. 3 Nameplate
2.2 Options
The table contains a list of possible options. The options for this machine are shown near the
nameplate.
➤ Enter options here as a reference:
Option Option code Available?
MODULATINGcontrol C1
SIGMA CONTROL 2
(Prepared for connection to control centre)
C3 —
SIGMA CONTROL 2
(Connection to control technology not provided)
C48 ✓
Bolt-down machine mounts H1
Air-cooling K1 ✓
Transformer power supply for refrigeration dryer T2 —
Prepared for heat recovery W1
Provided: ✓
Not available: —
Tab. 4 Options
2 Technical Specifications
2.1 Nameplate
4
Operating Manual Rotary screw compressor
SK 901848 21 E

2.3 Mass
The values shown are maximum values. Actual mass of individual machines are dependent on
equipment fitted.
SK 22 SK 25 —
Mass [kg] 312 320 —
Tab. 5 Mass
2.4 Temperature
SK 22 SK 25 —
Minimum cut-in tempera‐
ture [°C]
3 3 —
Typical airend discharge
temperature during oper‐
ation [°C]
65 – 100 65 – 100 —
Maximum airend dis‐
charge temperature (au‐
tomatic safety shut-down)
[°C]
110 110 —
Tab. 6 Temperature
2.5 Ambient conditions
SK 22 SK 25 —
Maximum elevation amsl
[m]
1000 1000 —
Permissible ambient tem‐
perature [°C]
3 – 45 3 – 45 —
Cooling air temperature
[°C]
3 – 45 3 – 45 —
Intake air temperature
[°C]
3 – 45 3 – 45 —
* Higher altitudes are permissible only after consultation with the manufacturer.
Tab. 7 Ambient conditions
2 Technical Specifications
2.3 Mass
901848 21 E
Operating Manual Rotary screw compressor
SK 5

Fig. 1 Maximum relative humidity of intake air
TIntake air temperature [°C]
HMaximum relative humidity of intake air [%]
2.6 Ventilation
The values given are minimum guide values.
Mains frequency: 50 Hz
SK 22 SK 25 —
Inlet aperture Z see fig‐
ure 9 [m2]
0.35 0.40 —
Forced ventilation with
exhaust fan:
Flow rate [m3/h] at 100
Pa
4500 5500 —
Tab. 8 Overview Ventilation (50Hz)
Mains frequency: 60 Hz
SK 22 SK 25 —
Inlet aperture Z see fig‐
ure 9 [m2]
0.35 0.40 —
Forced ventilation with
exhaust fan:
Flow rate [m3/h] at 100
Pa
4500 5500 —
Tab. 9 Overview Ventilation (60Hz)
2.7 Pressure
Maximum working pressure: (see nameplate)
2 Technical Specifications
2.6 Ventilation
6
Operating Manual Rotary screw compressor
SK 901848 21 E

Pressure relief valve activating pressure at 50 Hz [bar]:
Maximum working over‐
pressure [bar]
SK 22 SK 25 —
8.0 10 10 —
11.0 13 13 —
15.0 16* 16* —*
* China: 15.9
Tab. 10 Pressure relief valve activating pressure (50Hz)
Pressure relief valve activating pressure at 60 Hz [bar]:
Maximum working over‐
pressure [bar]
SK 22 SK 25 —
8.5 10 10 —
11.0 13 13 —
15.0 16 16 —
Tab. 11 Pressure relief valve activating pressure (60Hz)
2.8 Flow rate (constant delivery volume relative to intake conditions)
Flow rate [m3/min] at 50 Hz mains frequency:
Max. working pres‐
sure [bar]
SK 22 SK 25 —
8.0 2.00 2.50 —
11.0 1.67 2.10 —
15.0 1.30 1.70 —
Flow rate as per ISO 1217:2009. Annex C
Tab. 12 Flow rate (50Hz)
Flow rate [m3/min] at 60 Hz mains frequency:
Max. working pres‐
sure [bar]
SK 22 SK 25 —
8.5 2.00 2.50 —
11.0 1.67 2.17 —
15.0 1.30 1.77 —
Flow rate as per ISO 1217:2009. Annex C
Tab. 13 Flow rate (60 Hz)
2 Technical Specifications
2.8 Flow rate (constant delivery volume relative to intake conditions)
901848 21 E
Operating Manual Rotary screw compressor
SK 7

2.9 Cooling oil recommendation
A sticker showing the type of oil used is located near the oil separator tank filler.
For information on ordering cooling oil, please see chapter 11.
Cooling oils for general applications
SIGMA FLUID
MOL S-460 S-570
Description Mineral oil Synthetic oil Synthetic oil
Application Standard oil for all appli‐
cations except in connec‐
tion with processing of
foodstuffs.
Particularly suitable for
machines with a low duty
cycle.
Standard oil for all applica‐
tions except in connection
with processing of food‐
stuffs.
Particularly suitable for ma‐
chines with a high duty cy‐
cle.
Not suitable for East and
South East Asia.
Special oil for ambient con‐
ditions with high tempera‐
tures and humidity.
Standard oil for all applica‐
tions except in connection
with foodstuffs.
Particularly suitable for ma‐
chines with a high duty cy‐
cle.
Viscosity at
40°°C
46 mm2/s
(ASTM D445)
46 mm2/s
(ASTM D445)
53 mm2/s
(ASTM D445)
Viscosity at
100 °C
6.9 mm2/s
(ASTM D445)
7.2 mm2/s
(ASTM D445)
8.0 mm2/s
(ASTM D445)
Flash point 230 °C
(ASTM D92)
251 °C
(ASTM D92)
258 °C
(ASTM D92)
Density at
15 °C
0.868 g/cm3
(ASTM D1298)
0.860 g/cm3
(ASTM D1298)
0.869 g/cm3
(ASTM D1298)
Pour point: −30 °C
(ASTM D97)
−27 °C
(ASTM D97)
−54 °C
(ASTM D97)
Tab. 14 Cooling oil recommendation
Cooling oils for applications in food processing
SIGMA FLUID
FG-460 FG-680
Description Synthetic oil Synthetic oil
Application Specifically for machines in applica‐
tions where the compressed air may
come into contact with foodstuff.
Special oil for ambient conditions with high
temperatures and humidity.
Specifically for machines in applications
where the compressed air may come into
contact with foodstuff.
Approval USDA H1, NSF
Approved for applications where
contact with foodstuffs may sporadi‐
cally or incidentally be possible.
USDA H1, NSF
Approved for applications where contact
with foodstuffs may sporadically or inci‐
dentally be possible.
Viscosity at 40°
°C
46 mm2/s (ASTM D445) 68 mm2/s (ASTM D445)
2 Technical Specifications
2.9 Cooling oil recommendation
8
Operating Manual Rotary screw compressor
SK 901848 21 E

SIGMA FLUID
FG-460 FG-680
Viscosity at
100 °C
8.0 mm2/s (ASTM D445) 10.5 mm2/s (ASTM D445)
Flash point 246 °C (ASTM D92) 238 °C (ASTM D92)
Density at
15 °C
0.842 g/cm3 (ASTM D1298) 0.854 g/cm3 (ASTM D1298)
Pour point: −39 °C (ASTM D97) −39 °C (ASTM D97)
Tab. 15 Cooling oil recommendation (food processing)
Cooling oils for the operation with snow cannons
SIGMA FLUID
PANOLIN HLP SYNTH 46
Description Saturated synthetic ester with additives (mineral oil free)
Easily biologically degradable as per OECD criteria
Application Specifically designed for machines intended for the operation with snow can‐
nons.
Viscosity at 40°°C 47 mm2/s (ISO 2104)
Viscosity at
100 °C
8.2 mm2/s (ISO 2104)
Flash point 240 °C (ISO 2592)
Density at 15 °C 0.918 g/cm3 (ISO 12185, ISO 3675)
Pour point: -57 °C (ISO 3016)
Tab. 16 Cooling oil recommendation (machines for snow cannons)
2.10 Cooling oil charge
For machines with the Option W1, the volume required additionally for the heat recovery must be
added to the charge.
SK 22 SK 25 —
Fluid volume* [litre] 7.0 7.0 —
Topping up volume [litres]
(minimum–maximum)
0.3 0.3 —
* Plus the oil volume of the heat recovery system.
Tab. 17 Cooling oil charge (Option K1)
2 Technical Specifications
2.10 Cooling oil charge
901848 21 E
Operating Manual Rotary screw compressor
SK 9

Heat recovery
The additional volume corresponds to the oil volume of the heat exchanger and the connecting
lines:
SK 22 SK 25 —
Additional charge vol‐
ume [l]*
* Enter the volume required by your heat recovery system.
Tab. 18 Cooling oil charge (Option W1)
2.11 Motors and power
2.11.1 Compressor drive motor
SK 22 SK 25 —
Rated power [kW] 11.0 15.0 —
Enclosure protection IP 55 IP 55 —
Tab. 19 Compressor drive motor
Rated speed [min−1] (Mains frequency: 50 Hz):
Max. working pres‐
sure [bar]
SK 22 SK 25 —
8.0 2960 2960 —
11.0 2960 2960 —
15.0 2960 2960 —
Tab. 20 Compressor drive motor: Rated speed for 50 Hz
Rated speed [min−1] (Mains frequency: 60 Hz):
Max. working pres‐
sure [bar]
SK 22 SK 25 —
8.5 3565 3565 —
11.0 3565 3565 —
15.0 3565 3565 —
Tab. 21 Compressor drive motor: Rated speed for 60 Hz
2.12 Noise emission [dB(A)]
Mains frequency SK 22 SK 25 —
50 Hz 66 67 —
Noise pressure level in operation at maximum working gauge pressure as per ISO 2151 and the
basic standard ISO 9614-2, uncertainty: ±3 dB(A)
2 Technical Specifications
2.11 Motors and power
10
Operating Manual Rotary screw compressor
SK 901848 21 E
Option W1