Atlas Copco LT 2 Instruction Book
  1. Manuals
  2. Brands
  3. Atlas Copco Manuals
  4. Air Compressor
  5. LT2
  6. Instruction book
Atlas Copco LT 2 Instruction Book

Atlas Copco LT 2 Instruction Book

Industrial aluminium piston compressors
Hide thumbs Also See for LT 2:
Table of Contents

Advertisement

Quick Links

Download this manual
Atlas Copco
Industrial aluminium piston compressors
LT 2, LT 3, LT 5, LT 7, LT 10, LT 15, LT 20
Instruction book

Advertisement

Table of Contents
loading

Related Manuals for Atlas Copco LT 2

Summary of Contents for Atlas Copco LT 2

  • Page 1 Atlas Copco Industrial aluminium piston compressors LT 2, LT 3, LT 5, LT 7, LT 10, LT 15, LT 20 Instruction book...
  • Page 3 Atlas Copco Industrial aluminium piston compressors LT 2, LT 3, LT 5, LT 7, LT 10, LT 15, LT 20 Instruction book Original instructions Copyright notice Any unauthorized use or copying of the contents or any part thereof is prohibited.

  • Page 4: Table Of Contents

    Instruction book Table of contents Safety precautions......................4 ...........................4 AFETY ICONS ......................4 AFETY PRECAUTIONS GENERAL ...................4 AFETY PRECAUTIONS DURING INSTALLATION ....................6 AFETY PRECAUTIONS DURING OPERATION ................7 AFETY PRECAUTIONS DURING MAINTENANCE OR REPAIR General description......................9 ........................9 ENERAL DESCRIPTION ............................14 PTIONS ............................15 IR FLOW ........................20 EGULATING SYSTEM Installation........................22...
  • Page 5 Instruction book Maintenance........................53 ......................53 ETROL ENGINE MAINTENANCE ....................53 REVENTIVE MAINTENANCE SCHEDULE ......................54 UBRICATION OF COMPRESSORS ..........................54 ERVICE KITS ......................55 ISPOSAL OF USED MATERIAL Servicing and adjustment procedures...............56 ......................56 NLOADER OR CHECK VALVE ............................56 ALVES ............................58 IR FILTER MDR4 .....................59 DJUSTMENT PRESSURE SWITCH MDR3 ..................60...

  • Page 6: Safety Precautions

    Instruction book Safety precautions Safety icons Explanation Danger for life Warning Important note Safety precautions, general General precautions 1. The operator must employ safe working practices and observe all related work safety requirements and regulations. 2. If any of the following statements does not comply with the applicable legislation, the stricter of the two shall apply.
  • Page 7 Instruction book Precautions during installation 1. The machine must only be lifted using suitable equipment in accordance with the applicable safety regulations. Loose or pivoting parts must be securely fastened before lifting. It is strictly forbidden to dwell or stay in the risk zone under a lifted load. Lifting acceleration and deceleration must be kept within safe limits.

  • Page 8: Safety Precautions During Operation

    Instruction book Safety precautions during operation All responsibility for any damage or injury resulting from neglecting these precautions, or non-observance of the normal precautions and care required for installation, operation, maintenance and repair, even if not expressly stated, will be disclaimed by the manufacturer.

  • Page 9: Safety Precautions During Maintenance Or Repair

    Instruction book Safety precautions during maintenance or repair All responsibility for any damage or injury resulting from neglecting these precautions, or non-observance of the normal precautions and care required for installation, operation, maintenance and repair, even if not expressly stated, will be disclaimed by the manufacturer.
  • Page 10 Instruction book abundantly with fresh water over the clothing until all refrigerant is flushed away; then seek medical first aid. 21. Protect hands to avoid injury from hot machine parts, e.g. during draining of oil. Also consult the following safety precautions: Safety precautions during installation Safety precautions during operation.

  • Page 11: General Description

    General description General description Introduction LT are air-cooled, two-stage, two cylinder lubricated piston compressors, built for effective working pressures up to 30 bar (LT 2 only for 15 and 20 bar). Compressor block with unloading valve Power pack 2920 7089 90...
  • Page 12 Instruction book Power pack with unloading valve Base mounted 2920 7089 90...
  • Page 13 Instruction book Tank-mounted, LT 2 up to LT 3, horizontal receiver Tank-mounted, horizontal receiver 2920 7089 90...
  • Page 14 Instruction book Tank-mounted, Full-Feature unit, 475 l receiver LT Trolley Petrol/Electric Reference Description Air filter Air receiver Air outlet valve Check valve Condensate drain valve Oil drain plug Filler cap Air pressure gauge 2920 7089 90...
  • Page 15 • Fan (FN) • Air cooler piping • Check valve (CV), as standard on LT 2 and LT 3 • Unloader (UA), as standard on LT 5 up to LT 10 and LT 15 up to LT 20 • Safety valve (SV) •...

  • Page 16: Options

    The tank-mounted unit comprises: • For LT 2 up to LT 3: The Power pack mounted on a horizontal air receiver (AR) with air outlet valve (AV), pressure gauge (Gp), safety valve (SV), air pressure switch with an on/off button (MDR) and condensate drain valve (Dm).

  • Page 17: Air Flow

    Instruction book CD adsorption dryer Heavy duty air inlet filter N.O. (normally open contact) Break contact Oil level switch N.C. (normally closed contact) Make contact Receiver wheel set 90 and 250 liters horizontal receivers Power supply cable with CEE 3 pole plug 16 Amp (3 m) Auto restart to start unloaded after power failure...
  • Page 18 Instruction book Air flow and regulating system with DOL starter 2920 7089 90...
  • Page 19 Instruction book Air flow and regulating system with Y/D starter 2920 7089 90...
  • Page 20 Instruction book Air flow and regulating system of trolley 2920 7089 90...
  • Page 21 Instruction book Full-Feature Air flow and regulating system, Full- Feature References on flow diagrams Reference Description Air filter Air receiver Air outlet valve AV1/AV2 Air outlet valves Check valve Condensate drain valve Oil filler cap Air pressure gauge Motor Air pressure switch Pulsation damper On/off switch Pilot valve...

  • Page 22: Regulating System

    Plunger Spring Pressure regulator Refrigerant dryer Regulating system LT 2 up to LT 7 with DOL starter The regulating system includes: • Check valve (CV) • Air pressure switch (MDR) with pressure release valve (6) and on/off button (S1). Operation Air pressure switch (MDR) opens and closes its contacts at pre-set pressures.
  • Page 23 Instruction book The regulating system includes: • Electric cubicle • Air pressure switch (MDR) • On/off switch (S1) • Solenoid valve (Y1) • Unloader (UA) with integrated check valve (CV) Operation Air pressure switch (MDR) opens and closes its contacts at pre-set pressures. During loaded operation, the contacts are closed: the motor is running and solenoid valve (Y1) is energized preventing the compressed air from flowing to unloader (UA).

  • Page 24: Installation

    Instruction book Installation Dimension drawings Dimension drawings LT 2 up to LT 5, Power Pack 2920 7089 90...
  • Page 25 Instruction book LT 7 up to LT 10, Power Pack 2920 7089 90...
  • Page 26 Instruction book LT 10 up to LT 20, Power Pack 2920 7089 90...
  • Page 27 Instruction book LT 2 up to LT 5, Base-mounted 2920 7089 90...
  • Page 28 Instruction book LT 7 up to LT 10, Base-mounted 2920 7089 90...
  • Page 29 Instruction book LT 2 up to LT 20, Pack with silencing hood 2920 7089 90...
  • Page 30 Instruction book LT 2 up to LT 3, Tank-mounted, receiver 90 l 2920 7089 90...
  • Page 31 Instruction book LT 2 up to LT 5, Tank-mounted, vertical receiver 250 l 2920 7089 90...
  • Page 32 Instruction book LT 2 up to LT 5, Tank-mounted, horizontal receiver 250/475 l 2920 7089 90...
  • Page 33 Instruction book LT 7up to LT 10, Tank-mounted, horizontal receiver 250/475 l 2920 7089 90...
  • Page 34 Instruction book LT 15 up to LT 20, Tank-mounted, horizontal receiver 250/475 l 2920 7089 90...
  • Page 35 Instruction book LT 2 up to LT 5, Tank-mounted, Full-Feature, receiver 250 l 2920 7089 90...
  • Page 36 Instruction book LT 5 up to LT 10, Tank-mounted, Full-Feature, receiver 475 l 2920 7089 90...
  • Page 37 Instruction book LT 2 up to LT 5, Tank-mounted with silencing hood 2920 7089 90...
  • Page 38 Instruction book LT 7 up to LT 10, Tank-mounted with silencing hood 2920 7089 90...
  • Page 39 Instruction book LT Trolley with electrical motor 2920 7089 90...
  • Page 40 Instruction book LT Trolley with petrol engine References of figures on dimension drawings. Reference Description Air inlet Hole, 15 x 25 (4X) Cooling air inlet Net mass Compressed air outlet, G1/2 2920 7089 90...

  • Page 41: Installation Instruction

    Instruction book Reference Description Manual condensate drain Hole, 15 x 25 (3X) Receiver Cooling air inlet Motor cooling air inlet Compressed air outlet Compressor cooling air and air inlet For dismantling air filter Compressor air outlet with flexible (2 meters) Electric cable entry (on rear side) Air outlet Installation instruction...
  • Page 42 Instruction book Installation proposal for tank-mounted unit (250/475 l receiver) 2920 7089 90...
  • Page 43 Instruction book Installation proposal for tank-mounted unit (vertical 250 l receiver) 2920 7089 90...
  • Page 44 Instruction book Installation proposal for base-mounted unit with optional silencing hood 2920 7089 90...
  • Page 45 Instruction book Installation proposal for tank mounted compressors with silencing hood References of figures on installation drawings. Reference Description Cooling air outlet Compressor air and cooling air inlet Install the compressor horizontally, in a cool but frost-free and well-ventilated room. Place the compressor as level as possible;...

  • Page 46: Electrical Connections

    Instruction book The compressors are equipped with a lifting eye or yoke. When running, the compressor must be installed as level as possible; however, it can be operated temporarily in an inclined plane of maximum 25% (or 15 degrees). Keep the compressor in a frost-free and well-ventilated place. Electrical connections Warning The electrical connection must be carried out by an electrician and corresponds to the local codes.

  • Page 47: Settings Of Overload Relay And Fuses

    Electrical diagram with direct-on-line starter Settings of overload relay and fuses Settings of overload relay - fuses of compressors with DOL starter 50 Hz Type Voltage Overload relay Fuses LT 2 230 (1-phase) LT 2 LT 2 2920 7089 90...
  • Page 48 LT 5 LT 7 20.3 LT 7 12.4 LT 10 14.7 60 Hz Type voltage overload relay fuses LT 2 LT 2 LT 3 LT 5 11.1 LT 5 LT 5 LT 7 25.1 LT 7 12.8 LT 7 LT 10 28.5...
  • Page 49 Instruction book LT 7 LT 10 14.5 LT 10 Type voltage overload relay fuses LT 15-30 22.4 LT 15-30 12.9 LT 15 22.4 LT 15 12.9 LT 20 30.8 LT 20 17.9 LT 20-30 30.8 LT 20-30 17.9 60 Hz Type voltage overload relay...

  • Page 50: Cable Sizes

    Instruction book Cable sizes Starter Cable size mm² LT 2 and LT 3 LT 5 and LT 7 LT 10 LT 5 LT 7 LT 10 and LT 15 LT 20 Pictographs Reference Description Temperature Pressure Warning: voltage Switch off voltage and depressurize before maintenance or repair...

  • Page 51: Operating Instructions

    It is strongly recommended to install an interstage drain kit, to remove excess condensate, on LT compressors with a load factor less than 20% per hour. Consult Atlas Copco. 1. For Tank-mounted and base mounted units, remove the transport brackets from underneath the compressor.
  • Page 52 Instruction book 4. For the full feature units, also push the switch to position I to start up the refrigerant dryer. Approximately 10 minutes later, the nominal dewpoint will be reached. To ensure optimum operational efficiency, do not use dryer on/switch repeatedly within a short time period.

  • Page 53: Stopping

    Instruction book 4. Plug in and switch on the voltage at the main circuit breaker. Warning: Never move the compressor after plugging it in. 5. Move switch to position I or push switch (S1) to position I. 6. Open the outlet valves (AV1 and AV2). 7.

  • Page 54: Taking Out Of Operation

    • Store the machine in its normal position, not upside down or on its side. • If the machine is stored for 1 year or more, rotate the bearings once a month to change the position of the roller balls in the bearings. Consult Atlas Copco Service. 2920 7089 90...

  • Page 55: Maintenance

    Air filter 15, LT 20, replace air filter. Yearly On LT 5, 7 and Air filter 10, replace air filter. Yearly On LT 2 and LT Air filter 3, replace air filter. Yearly 2000 Change blow-off silencer, if provided. Yearly...

  • Page 56: Lubrication Of Compressors

    Piston Fluid oil can be ordered in different quantities: a 1-liter can and 5-liter can. Service kits Service kits are available, offering the benefits of genuine Atlas Copco parts while keeping the maintenance budget low. The kits comprise all parts needed for servicing. Consult the Parts list for the contents of all kits.

  • Page 57: Disposal Of Used Material

    Instruction book Reference Description Valve kit Filter kit Check valve Unloader Piston Fluid Notes: 1. Use only authorized parts. Any damage or malfunction caused by the use of unauthorized parts is not covered by Warranty or Product Liability. 2. Whichever interval comes first. The local Sales Company may overrule the maintenance schedule, especially the service intervals, depending upon the environmental and working conditions of the compressor.

  • Page 58: Servicing And Adjustment Procedures

    Dirt, condensate, coke formation and oxidation influence the proper operation of the valve. Depending on the environmental and working conditions (ambient temperature, working pressure, load cycle, oil type), the local Atlas Copco customer center or authorized distributor may overrule the maintenance schedule (consult Atlas Copco).
  • Page 59 Instruction book It is highly recommended to replace the valve discs, O-rings and gaskets if disassembling the cylinder heads. Cylinder heads, high pressure variants Reference Description Air inlet silencer Gasket Spring Outlet valve guard Outlet valve disc Valve seat Inlet valve disc Guide pin O-ring O-ring...

  • Page 60: Air Filter

    Instruction book • Remove the fan guard, unscrew the cap and remove the cover, air filter and cover of the air inlet silencer (1). • Disconnect head (13) from the inlet an outlet pipe flanges. Remove cylinder head cover (12). Remove head.

  • Page 61: Adjustment Mdr4 Pressure Switch

    Instruction book Adjustment MDR4 pressure switch Views of air pressure switch MDR4 Name Air pressure switch Solenoid valve Pressure release valve Adjusting screw, stopping pressure Adjusting screw, pressure difference Function The adjustment of the maximum or stopping pressure of the compressor is effected by means of the air pressure switch.

  • Page 62: Adjustment Of Mdr3 Pressure Switch

    Instruction book Pressure difference diagram MDR4 - 25 bar Name Starting pressure - bar(e) Stopping pressure - bar(e) Adjustment of MDR3 pressure switch Views of air pressure switch MDR3 with ON/OFF switch This pressure switch has a cover with rotary knob (4) for manual On/Off (Auto/Off). Reference Description Dial, overload relay...
  • Page 63 Instruction book Function The switch allows the operator to select the stopping pressure and the pressure difference between stopping and starting pressures. The stopping and starting pressures are the opening and closing pressures of the switch. Adjustment • Adjust the air pressure switch while it is pressurized. •...

  • Page 64: Adjustment Of Pilot Valve On Trolley

    Instruction book Pressure difference diagram, MDR3/35 (30 bar units) Name Starting pressure - bar(e) Stopping pressure - bar(e) Adjustment of pilot valve on Trolley The adjustment of the maximum or unloading pressure of the compressor is effected by means of pilot valve (RV) The valve also controls the difference between the preset maximum pressure and that at which compression is resumed.

  • Page 65: Safety Valve

    Instruction book Reference Description Unloading handle Pressure adjusting screw Nuts Shims Unload mechanism The pilot valve is equipped with a hand-operated unload mechanism: by turning the red handle (1) 90 degrees, the plunger of the valve will be lifted, releasing the spring force. The air pressure from the pulsation dampers will force down unloader plunger (8) and the compressor will run unloaded.

  • Page 66: Relief Valve

    Instruction book 4. Gradually turn adjusting screw (2) clockwise while checking pressure gauge (Gp). If the safety valve has not opened at the pressure specified in Compressor data, it must be replaced by a new one. 5. Readjust the normal working pressure after testing. Consult section Adjustment of pilot valve 6.

  • Page 67: Problem Solving

    Instruction book Problem solving Condition Fault Remedy Insufficient air pressure Air leak Check and correct as necessary Air filter choked Replace filter Air pressure switch incorrectly Adjust switch Air consumption exceeds Check equipment connected maximum output of compressor Damaged valve Inspect valves and replace parts where necessary Unloader malfunctioning...
  • Page 68 Blow-off silencer choked Replace Ambient temperature too high Improve ventilation of room Motor stops and starts too See "Too frequent starting/too frequently short operating periods" Overcurrent due to motor or Consult Atlas Copco compressor failure 2920 7089 90...

  • Page 69: Technical Data

    Maximum working pressure bar(e) See below Only applicable for Full Feature variants. (with refrigerant dryer) Minimum ambient air temperature °C Compressor data 50 Hz (15 bar) Compressor LT 2 LT 3 LT 5 LT 7 LT 10 type Maximum bar(e) working...
  • Page 70 Instruction book Compressor LT 2 LT 3 LT 5 LT 7 LT 10 type Power input at 2.29 2.87 4.95 6.64 8.67 maximum working pressure Motor shaft r/min 1500 1500 1500 1500 1500 speed Free air 11.7 delivery (Note Oil capacity...
  • Page 71 Instruction book Compressor LT 2 LT 3 LT 5 LT 7 type Motor shaft r/min 1800 1800 1800 1800 speed Free air delivery 10.9 (Note 1) Oil capacity Opening bar(e) pressure of safety valve Opening bar(e) pressure of relief valve...
  • Page 72 Instruction book Compres LT 2 LT 3 LT 5 LT 7 LT 10 LT 15 LT 20 sor type Opening bar(e) pressure of relief valve Maximum sound pressure level (Note 2) - Tank- dB(A) 86.5 mounted - Tank- dB(A) mounted...
  • Page 73 Instruction book Compress LT 2 LT 3 LT 5 LT 7 LT 15 LT 20 or type - Base- dB(A) mounted with hood 50 Hz (30 bar) Compress LT10 LT15 LT20 or type Maximum bar(e) working pressure Temperature at outlet valve, approx.
  • Page 74 Instruction book Compressor LT15 LT20 type - Silenced °C compressor Power input at 3.44 5.77 7.63 8.42 16.4 max. working pressure Motor shaft r/min 1800 1800 1800 1800 1800 speed Free air 11.1 19.7 delivery (Note Oil capacity Opening bar(e) pressure of relief valve Maximum sound pressure level.

  • Page 75: Instructions For Use

    Instruction book Instructions for use Air receiver (tank-mounted units) Corrosion must be prevented: depending on the conditions of use, condensate may accumulate inside the tank and must be drained every day. This may be done manually, by opening the drain valve, or by means of the automatic drain, if fitted to the tank. Nevertheless, a weekly check of correct functioning of the automatic valve is needed.

  • Page 76: Pressure Equipment Directive (Ped)

    Instruction book Pressure Equipment Directive (PED) Components subject to the 97/23/EC Pressure Equipment Directive The following table contains the necessary information for the inspection of all pressure equipment of category II and higher according to the Pressure Equipment Directive 97/23/EC and all pressure equipment according to the Simple Pressure Vessel Directive 87/404/EEC.

  • Page 77: Declaration Of Conformity

    Instruction book Declaration of conformity Typical example of a Declaration of Conformity document (1): Contact address: Atlas Copco Airpower n.v. P.O. Box 100 B-2610 Wilrijk (Antwerp) Belgium 2920 7089 90...
  • Page 80 Atlas Copco's pursuit of innovation never ceases, driven by our need for reliability and efficiency. Always working with you, we are committed to providing you the customized quality air solution that is the driving force behind your business.

This manual is also suitable for:

Lt 3Lt 5Lt 7Lt 10Lt 15Lt 20

Table of Contents