L&W SC-300 E User manual

C H A P T E R O V E R V I E W
Operating Instructions ...............................................................................................................
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Attachment ....................................................................................................................................
A
B
C
D
E
Manufacturer in terms of 97/23/EC
The full name and address of the manufacturer is:
Lenhardt & Wagner GmbH
An der Tuchbleiche 39
68623 Hüttenfeld / Germany
Phone: [phone] - 85 88 0 - 0
Fax: [phone] - 85 88 0 - 14
E-Mail: [e-mail]
Internet: www.lw-compressors.com

S E R V I C E I N F O R M A T I O N / W A R R A N T Y
Compressor information
Type designation
Serial number
Date of construction
Purchase information
Purchase date
First commissioned on
Warranty period
Dealer's stamp
Warranty
L&W will uphold warranty claims made during a period of 12 months from the invoice date.
If the compressor was purchased from an official L&W dealer, the date on the dealer's invoice is
valid. Warranty claims can only be made on presentation of the original invoice.
Should verifiably defective parts have been delivered, we will decide to either replace the parts or
repair them. The resulting transport and assembly costs will be invoiced.
No reduction of the purchase price or changes to the contract can be made. The parts for which a
claim is being made should be kept safe by the purchaser and, when requested, sent to us at their
cost. Replaced parts become the property of L&W. If maintenance work is carried out without our
knowledge or permission by the purchaser or a third party, we are absolved from any liability for
warranty claims. As a matter of principle, warranty claims can only be made by the initial purchaser.

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Operating Instructions
Breathing Air Compressor
LW SC-300 E / LW SC-350 E
Version: 12/22-E

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LW SC-300 E / LW SC-350 E
Version: 06.12.2022
T A B L E O F C O N T E N T S
General Information and Technical Data
General Information / Description of Warning Symbols .................................................................... 4
Scope of Delivery .............................................................................................................................. 5
Technical Data .................................................................................................................................. 6
Unit Assembly ................................................................................................................................... 7
Switchboard ..................................................................................................................................... 8
Flow chart ......................................................................................................................................... 9
Safety Precautions
Intended Use / Operators ................................................................................................................ 11
Safety instructions on the unit ........................................................................................................ 12
General Safety Precautions ............................................................................................................. 13
Unit customised safety notices ........................................................................................................ 14
Maintenance instructions ................................................................................................................ 15
Transportation instructions / Safety regulations .............................................................................. 16
Installation
Installation in closed rooms ............................................................................................................ 18
Dimensions ...................................................................................................................................... 19
Minimum distances ......................................................................................................................... 20
Ventilation ...................................................................................................................................... 21
Electrical Installation ................................................................................................................ 22 - 23
Operation
Important operation instructions .................................................................................................... 25
First commissioning ................................................................................................................. 26 - 28
Daily commissioning ....................................................................................................................... 29
Filling procedure ............................................................................................................................. 30
Switch off the compressor .............................................................................................................. 31
Remedying faults .............................................................................................................. 32 - 36
Maintenance and Service
Service, Repair and Maintenance .................................................................................................... 38
Maintenance Lists / Maintenance Intervals ............................................................................... 39 - 42
Check V-belt tension / Tension V-belt ............................................................................................... 43
Compressor lubrication / Check oil level .......................................................................................... 44
Oil change ...................................................................................................................................... 45
Oil filter maintenance ..................................................................................................................... 46
Final pressure switch ....................................................................................................................... 47

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LW SC-300 E / LW SC-350 E
Version: 06.12.2022
T A B L E O F C O N T E N T S
Maintenance and Service
Automatic condensation dump system ........................................................................................... 48
Oil / Water separators 2nd stage - maintenance ............................................................................. 49
Oil / water separators final stage - maintenance ............................................................................. 50
Pneumatic condensate valve - maintenance .................................................................................... 51
Filter housing / Filter cartridge ........................................................................................................ 52
Filter cartridge change ..................................................................................................................... 53
Filter housing - Maintenance ........................................................................................................... 54
Inlet filters / Inlet filter cartridge change ......................................................................................... 55
Cylinder heads and valves ............................................................................................................... 56
Replace inlet and outlet valve 1st stage ................................................................................... 57 - 58
Replace inlet and outlet valves 2nd and 3rd stage .......................................................................... 59
Safety valves ................................................................................................................................... 60
Pressure maintaining / non return valve .......................................................................................... 61
Safety valve test .............................................................................................................................. 62
Leak test ......................................................................................................................................... 63
Pressure gas vessel test ................................................................................................................... 64
Maintenance records ............................................................................................................... 65 - 70
Storage
Conservation / storage of the compressor ........................................................................................ 71
De-conservation, commissioning .................................................................................................... 71
Transportation instructions / Disposal ............................................................................................. 72

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LW SC-300 E / LW SC-350 E
Version: 06.12.2022
Warning
Indicates a potentially hazardous situation which, if not avoided, could result in physical
injury or damage to the product or environment.
Caution
Indicates an imminently hazardous situation which, if not avoided, could result in serious
injury, physical injury or death.
General Information
We strongly recommend reading this manual thoroughly prior to operation and follow all the safety
precautions precisely. Damage resulting from any deviation from these instructions is excluded from
warranty and liability for this product. Carry out other commissioning steps only if you have fully
understood the following contents.
Before commissioning and using the unit, carry out all the essential preliminary work and measures
concerning legal regulations and safety. These are described on the following pages of this
operation manual.
G E N E R A L I N F O R M A T I O N
!
!
Note
Indicates additional information on how to use the unit.
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Description of marks and warning signs
The following warning signs are used in this document to identify the corresponding warning notes
which require particular attention by the user. The warning signs are defined as follows:

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LW SC-300 E / LW SC-350 E
Version: 06.12.2022
D E S C R I P T I O N
Scope of Delivery
Compressors are provided in different equipped versions.
Versions
Filling pressure versions:
• PN 225 bar
• PN 330 bar
• PN 225 / 330 bar
Specifications
Options
• Auto start system
• 200 and 300 bar parallel filling pressures
• Phase monitoring c/w shut down at wrong
direction of rotation
• Ambient temperature monitoring
• Oil pressure gauge
• Intermediate pressure gauges
• Oil pressure monitoring c/w auto shut down
• Cylinder head temperature monitoring with
auto shut down
• Oil temperature display with auto shut down
• 1.7l filter housing
• Puracon filter monitoring (Auto shut down
also available)
• Remote Tab Control - RTC
• Additional high pressure outlet
• Additional high pressure outlet
• Power cable and plug
• Special voltages / frequencies on request
• Automatic condensate drain with pressure
free start/stop
• Automatic stop at final pressure
• Hour counter
• Operating panel with start/stop and
condensate test button, as well emergency
stop switch
• 2x Filling hose c/w filling valve
• Motor protection switch
• Pressure maintaining and non return valve
• All pistons c/w steel piston rings
• Low pressure oil pump and filter
• Oil- / Water separators in stainless steel
• Safety valves after each stage
• 3 x concentric suction/pressure valves
• Filling pressure to your choice
(200 or 300 bar)
• Connections to your choice (DIN 200 bar or
300 bar, CGA 200 bar or 300 bar and INT)
• Breathing air purification an accordance to EN
12021

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LW SC-300 E / LW SC-350 E
Version: 06.12.2022
D E S C R I P T I O N
Technical Data
Technical Data LW SC-300 E LW SC-350 E
Capacity [l/min]: 300 350
Max. Operating Pressure [bar]: 350 350
RPM [min-1]: 1270 1495
Number of Pressure Stages: 3 3
Cylinder Bore 1st Stage [mm]: Ø 95 Ø 95
Cylinder Bore 2nd Stage [mm]: Ø 40 Ø 40
Cylinder Bore 3rd Stage [mm]: Ø 18 Ø 18
Medium: Compressed Air / Breathing Air
Intake Pressure: atmospheric
Oil Pressure [bar]: +0.6 to +4.0 +0.6 to +4.0
Oil Capacity [l]: 1.8 1.8
Intake Temperature [°C]: 0 < +45 0 < +45
Ambient Temperature [°C]: +5 < +45 +5 < +45
Cooling Air Volume [m³/h]: > 2250 > 2250
Voltage: 400 V / 3 phase / 50 Hz
Protection Class Drive Motor: IP 54 IP 54
Drive Power [kW]: 7.5 7.5
RPM Motor [min-1]: 2890 2890
Start: Star/Delta
Noise level from a distance of 1 m [dB(A)]: 83 83
Dimensions W x D x H [mm]: 1060 x 640 x 1000
Weight [kg]: approx. 240 approx. 240
Content Volume Filter housing [l]: 0.98 0.98

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LW SC-300 E / LW SC-350 E
Version: 06.12.2022
Unit Assembly
D E S C R I P T I O N
No. Designation
1 Filling pressure gauge
2 Switchboard
3 Filling hoses (optional: without filling hoses)
4 Filling valves
1 2
4
3

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LW SC-300 E / LW SC-350 E
Version: 06.12.2022
Switchboard
D E S C R I P T I O N
1 2
3 4 5
No. Designation
1 Emergency shut-off switch
2 Hour counter
3 ON button
4 OFF button
5 Drain test button

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LW SC-300 E / LW SC-350 E
Version: 06.12.2022
Flow chart
D E S C R I P T I O N
1st stage
1. Kurbelgehäuse / Crankcase
2. Ansaugfilter / Air Intake Filter
3. 1. Verdichterstufe / 1st Pressure Stage
4. Manometer (Option) / Pressure Gauge (Option)
5. Wärmetauscher / Heat Exchanger
6. Sicherheitsventil 1. Stufe / Safety Valve 1st Stage
7. 2. Verdichterstufe / 2nd Pressure Stage
8. Wärmetauscher / Heat Exchanger
9. Öl-/Wasserabscheider / Oil-/Water Separator
10. Manometer (Option) / Pressure Gauge (Option)
11. Sicherheitsventil 2. Stufe / Safety Valve 2nd Stage
12. Pneumatisches Kondensatventil / Pneumatic Condensate
Valve
13. Magnetventil / Magnetventil
14. Kondensatablassschlauch / Condensate drain hose
15. 3. Verdichterstufe / 3rd Pressure Stage
16. Wärmetauscher / Heat Exchanger
17. Sicherheitsventil 3. Stufe / Safety Valve 3rd Stage
18. Druckschalter „Auto Stopp“ / Pressure Switch „Auto Stop“
19. Filtergehäuse / Filter Housing
20. Öl-/Wasserabscheider / Oil-/Water Separator
21. Druckhalteventil / Pressure Maintaining Valve
22. Rückschlagventil / Non-Return Valve
23. Öl-/Wasserabscheider / Oil-/Water Separator
24. Schalldämpfer / Silencer
25. Kondensatablassschlauch / Condensate drain hose
26. Druckschalter „Auto Start“ (Option) / Pressure Switch
„Auto Start“ (Option)
27. Manometer / Pressure Gauge
28. Hochdruckschlauch / HP-Hose
29. Kreuzventil / Filling Valve „Cross Design“
30. Füllspindel / Filling spindle
31. Entlüftungsspindel / Vent spindle
32. Flaschenanschluss Flaschenanschluss nach Wahl (DIN 200
oder 300bar, CGA 200bar oder 300bar und INT) / Tank
connector (DIN 200bar or 300bar, CGA 200bar or 300bar
and INT)
33. Hochdruckschlauch / HP-Hose
34. Kreuzventil / Filling Valve „Cross Design“
35. Hochdruckschlauch (Option) / HP-Hose (Option)
36. Kreuzventil (Option) / Filling Valve „Cross
Design“ (Option)
37. Hochdruckschlauch (Option) / HP-Hose (Option)
38. Kreuzventil (Option) / Filling Valve „Cross
Design“ (Option)
39. Füllschlauch / Filling Hose
2nd stage 3rd stage

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S A F E T Y P R E C A U T I O N S

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LW SC-300 E / LW SC-350 E
Version: 06.12.2022
Intended Use
Only use the unit in perfect condition for its intended purpose, safety and intended use and observe
the operating instructions! In particular disorders that may affect safety have to be eliminated
immediately!
Use the unit exclusively for the determined medium (see "Technical Data"). Any other use that is not
specified is not authorized. The manufacturer/supplier shall not be liable for any damages resulting
from such use. Such risk lies entirely with the user. Authorization for use is also under the condition
that the instruction manual is complied with and inspection and maintenance requirements are
enforced.
No change and modification to the unit can be made without the written agreement of the
manufacturer. The manufacturer is not liable for damage to persons or property resulting from
unauthorised modifications.
Operators
Target groups in these instructions;
Operators
Operators are persons who are authorized and briefed for the use of the compressor.
Qualified personnel
Qualified personnel are persons who are entitled to repair, service, modify and maintain the system.
S A F E T Y P R E C A U T I O N S
Warning
Only trained personnel are permitted to work on the unit!
!
Warning
Work on the electrical equipment on / with the machine / unit may only be carried out by
qualified electricians.
!

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LW SC-300 E / LW SC-350 E
Version: 06.12.2022
Safety instructions on the unit
Importance of notes and warning signs that are affixed to the compressor according to the
application or its equipment.
S A F E T Y P R E C A U T I O N S
Warning
High voltage!
Note
Ensure correct direction of
rotation!

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LW SC-300 E / LW SC-350 E
Version: 06.12.2022
S A F E T Y P R E C A U T I O N S
General Safety Precautions
• Read the Operating Instructions of this product carefully prior to use.
• Strictly follow the instructions. The user must fully understand and strictly observe the
instructions. Use the product only for the purposes specified in the intended use section of this
document.
• Do not dispose the operating instructions. Ensure that they are retained and appropriately used
by the product user.
• Only trained and competent personnel are permitted to use this product.
• Comply with all local and national rules and regulations associated with this product.
• Only trained and competent personnel are permitted to inspect, repair and service the product.
• Only authentic L&W parts and accessories may be used for maintenance work. Otherwise, the
proper functioning of the product may be impaired.
• Do not use faulty or incomplete products. Do not modify the product.
• Inform L&W in the event of any product or component fault or failure.
• The quality of the air supply must meet EN 12021 specifications for breathing air.
• Do not use the product in areas prone to explosion or in the presence of flammable gases. The
product is not designed for these applications. An explosion might be the result if certain
conditions apply.

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LW SC-300 E / LW SC-350 E
Version: 06.12.2022
S A F E T Y P R E C A U T I O N S
Unit customised safety notices
Organisational measures
• In addition to the instruction manual, observe and comply with universally valid legal and other
obligatory regulations regarding accident prevention and environment protection.
• In addition to the instruction manual, provide supplementary instructions for supervision and
monitoring duties taking into consideration exceptional factors e.g. with regard to organisation
of work, production, personnel employed.
• Supervise personnel’s work in accordance with the instruction manual, taking into account safety
and danger factors.
• Observe all safety and danger notices on the compressor and check readability and
completeness.
Safety instructions operation
• Take measures to ensure that the machine is only taken into operation under safe and functional
conditions. Only operate the compressor if all protective and safety equipment, e.g. detachable
protective equipment, are provided and in good working order.
• Check the compressor at least once per day for obvious damage and defects. Inform the
responsible department / person immediately if anything is not as is should be (including
operation performance). Shut down the machine immediately if necessary and lock it.
• In case of malfunction, stop the compressor immediately and lock it. Repair malfunctions
immediately.
• If there is a failure in the electric energy supply, shut the machine / unit down immediately.
• Ensure safe and environmentally friendly disposal of consumables and old parts.
• The stipulated hearing protectors must be worn.
• Soundproofing equipment on the compressor has to be activated in safety function during
operation.
• When handling with fats, oils and other chemical agents, observe the note for the product-
related safety.

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LW SC-300 E / LW SC-350 E
Version: 06.12.2022
S A F E T Y P R E C A U T I O N S
Maintenance instructions
• Hoses have to be checked by the operator (pressure and visual inspection) at reasonable
intervals, even if no safety-related defects have been detected.
• Immediately repair any damage. Escaping compressed air can cause injury.
• Depressurise system and pressure lines before beginning repair work.
• Pressurised air lines must be laid and mounted by qualified personnel. Connections must not be
mixed up. Fittings, length and quality of the piping must correspond to requirements.
• Adjustment, maintenance and inspection activities and keep appointments, including
information on replacement parts / equipment, prescribed in the operating instructions have to
be respected.
• If the machine / equipment is completely off during maintenance and repair work, it must be
protected against unexpected restart. Turn off main control device and remove the key and/or
display a warning sign on the main switch.
• The machine and especially the connections and fittings should be cleaned from oil, fuel and
maintenance products at the beginning of the maintenance / repair. Do not use aggressive
cleaning agents. Use fibre-free cleaning cloths.
• Switch off compressor and clean with a slightly damp cloth. Remove dirt from cooling pipes by
using a brush.
• After cleaning, examine all pipes for leaks, loose connections, chafing and damage. Immediately
eliminate any faults.
• Always retighten any screw connections loosened for maintenance or repair work.
• If it is necessary to remove safety devices for maintenance and repair work, these must be
replaced and checked immediately after completion of the maintenance or repair work.
• The electrical equipment of the compressor must be regularly checked. Defects, such as loose
screw connections or burnt wires, must be immediately rectified by electrically skilled personnel.
• Only personnel with particular knowledge and experience with pneumatics may carry out work
on pneumatic equipment.
• Only personnel with particular knowledge and experience in gas equipment may carry out work
on gas equipment.

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LW SC-300 E / LW SC-350 E
Version: 06.12.2022
S A F E T Y P R E C A U T I O N S
Transportation instructions
• Parts which need to be dismantled for transport purposes must be carefully replaced and secured
before taking into operation.
• The transport may only be carried out by trained personnel.
• For transportation, only use lifting devices and equipment with sufficient lifting power.
• Do not stand or work under suspended loads.
• Also separate from minor relocation machinery / system of any external energy supply. Before
recommissioning, reconnect the machine to the mains according to regulations.
• When recommissioning, proceed according to the operating instructions..
Safety regulations
• Inspections according to legal and local obligatory regulations regarding accident prevention are
carried out by the manufacturer or by authorised expert personnel. No guarantees whatsoever
are valid for damage caused or favoured by the non-consideration of these directions for use.

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I N S T A L L A T I O N

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LW SC-300 E / LW SC-350 E
Version: 06.12.2022
I N S T A L L A T I O N
Installation in closed rooms
For installation in closed rooms, observe the following:
• Install the unit horizontally and level. The floor must be vibration-free and capable of taking the
load of the system weight.
• The compressor room must be clean, dry, dust free and as cool as possible. Avoid direct exposure
to sunlight. If possible, install unit in such a manner that the compressor fan can intake fresh air
from outside. Ensure adequate ventilation and exhaust air opening.
• When locating the compressor in rooms of less than 30 m³ space where natural ventilation is not
ensured or other systems having high radiation are operating in the same room, measures must
be taken to provide artificial ventilation.
• Intake air must be free from noxious gas e.g. smoke, solvent vapours, exhaust fumes etc.
• Observe the specified operating temperature (see "Technical Data")!
•
•
•
•
Approximate value - Diameter of intake hose depending on the length of the intake hose
Danger
No operation in explosion-hazard areas.
The unit is not approved for operation in areas prone to explosion.
!
Hinweis
• Intake air must be free from noxious gas e.g. smoke, solvent vapours and exhaust
fumes. We recommend not to use the intake air inside the compressor housing. An
intake hose would be recommendable!
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Pos. Length of Intake Hose [m] Diameter of Intake Hose [mm]
1 ≤ 03 Ø 30
2 ≤ 10 Ø 80
3 ≤ 15 Ø 100
4 ≤ 20 Ø 120