Atlas Copco LT20 User Manual

Instruction book
Atlas Copco Stationary Air Compressors
LE2, -3, -5, -7, -10, -15, -20
LT2, -3, -5, -7, -10 (50 Hz)
LT15/60, -15-30, -15, -20, -20-30
LF2, -3, -5, -7, -10
Instruction book
Copyright 2004, Atlas Copco Airpower n.v., Antwerp, Belgium.
Any unauthorized use or copying of the contents or any part thereof is prohibited. This applies in
particular to trademarks, model denominations, part numbers and drawings.
This instruction book meets the requirements for instructions specified by the machinery directive
98/37/EC and is valid for CE as well as non-CE labelled machines.
No. 2920 1585 00
Registration code: APC L / 38 / 985
2004-07
2920 1585 00 - 1 -

Atlas Copco LT20 Specifications

General

Brand	Atlas Copco
Model	LT20
Category	Air Compressor
Language	English

Summary

1 Leading Particulars

1.3 Regulating System

Explains how compressor pressure is controlled and maintained.

2 Installation and Handling

2.3 Electrical Connections

Details electrical hook-up, wiring diagrams, and safety requirements.

2.4 Settings of Overload Relay, Fuses, and Cable Size

Guides on setting overload relays, fuse selection, and cable sizing.

3 Operating Instructions

Safety Precautions

Essential safety guidelines and precautions for compressor operation.

3.1 Initial Start-up

Steps for first-time startup and initial checks of the compressor.

3.2 Starting

Procedure for starting the compressor for various models.

4 Maintenance

4.2 Preventive Maintenance Schedule

Schedule of recommended maintenance tasks based on operating hours.

5 Servicing and Adjustment Procedures

Warning

Crucial warning about releasing pressure before performing servicing.

5.4 Adjustment of MDR4S Pressure Switch

How to adjust the stopping pressure and pressure difference for MDR4S.

5.5 Adjustment of MDR3 Pressure Switch

How to adjust the stopping pressure and pressure difference for MDR3.

5.6 Adjustment of Pilot Valve on Trolley

Procedure for adjusting the pilot valve on Trolley models.

5.7 Safety Valve Testing on LE/LF/LT

Procedure for testing the safety valve on LE/LF/LT units.

5.7 Safety Valve Testing on LE/LF/LT Trolley

Procedure for testing the safety valve on LE/LF/LT Trolley units.

5.8 Relief Valve

6 Problem Solving

1 Insufficient Air Pressure

2 Unit Does Not Speed Up

3 Over-Pressurization and Safety Valve Blow

4 Relief Valve Blows

5 Receiver Does Not Hold Pressure

6 Frequent Starting/Short Operating Periods

8 Unit Does Not Start

9 Overload Relay Cuts Out

Safety Precautions

General Safety Instructions

Essential safety guidelines and precautions for compressor operation.

Installation Safety Directives