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Gardner Denver L Series User Manual

Gardner Denver L Series
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Version: 02
February 21, 2018
L-SERIES
SINGLE STAGE
BASE- MOUNTED and TANK MOUNTED
COMPRESSORS
GD PILOT Controller
MODELS L7-11B (Fixed Speed)
MODELS LRS7-11B (Variable Speed)
10 and 15 HP
60HZ
OPERATING AND
SERVICE MANUAL

Table of Contents

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Gardner Denver L Series Specifications

General IconGeneral
TypeRotary Screw
DriveDirect
Cooling SystemAir or Water Cooled
Noise Level68 to 75 dBA
EfficiencyHigh Efficiency Motors
DimensionsVaries by Model
WeightVaries by Model

Summary

Safety Information and Labels

Warning - Prohibition - Mandatory Label Information

Explains mandatory safety warnings and prohibitions for safe operation.

DANGER Hazard Information

Details the critical risks and consequences associated with DANGER level warnings.

General Safety Precautions

Warning and Caution Statements

Outlines hazards with medium and low risk levels, requiring caution.

Prohibition/Mandatory Action Requirements

Lists mandatory actions for safe operation and prohibitions.

Safety Precautions

DANGER Safety Notices

Highlights severe risks like electric shock and mechanical injury.

WARNING Safety Notices

Covers equipment damage risks and operational warnings.

Installation

Electrical Installation and Wiring

Electrical Wiring Standards

Guidelines for wiring and electrical service.

Electrical Wire Sizing Data

Table showing wire size requirements based on current draw.

Grounding Requirements

Essential grounding procedures according to electrical codes.

Starting and Operating Procedures

Prestart-Up Instructions

Essential checks before initial operation of a new unit.

Compressor Oil and Filter Checks

Procedures for checking oil level and filters before starting.

Grounding Caution

Warning regarding improper grounding leading to controller malfunction.

GD Pilot Controller Operation

Controller Hardware and Screen Layout

Overview of the controller's buttons, display, and main screen.

Setting Cut-out and Cut-in Pressure

Instructions for adjusting pressure control parameters.

Controls and Instrumentation

GD Pilot Controller Features

Details on the microprocessor-controlled GD Pilot system.

Fixed Speed Wiring Diagram (380v)

Electrical schematics for 380v fixed-speed configuration.

Fixed Speed Wiring Diagram (575v)

Electrical schematics for 575v fixed-speed configuration.

Fixed Speed Wiring Diagram (208-230/460v)

Electrical schematics for 208-230/460v fixed-speed configuration.

Variable Speed Wiring Diagram (230v)

Electrical schematics for 230v variable-speed configuration.

Variable Speed Wiring Diagram (380/460v)

Electrical schematics for 380/460v variable-speed configuration.

Variable Speed Wiring Diagram (575v)

Electrical schematics for 575v variable-speed configuration.

Servicing Miscellaneous Devices

Minimum Pressure Valve (MPV) Inspection and Setting

How to inspect, replace, and set the MPV.

Lubrication, Oil Cooler, Filter, and Separator

Lubricant Change Procedure

Step-by-step guide for changing compressor lubricant.

Draining and Refilling Oil System

Procedure for complete oil system draining and refilling.

Air/Oil Separator and Filter Maintenance

Heat Exchangers (Oil/Air)

Air Filters

Maintenance Schedule

Troubleshooting Common Issues

Compressor Fails to Start or Stops Abruptly

Potential causes and remedies for startup failures.

Compressor Loading and Pressure Issues

Diagnosing problems with loading and pressure regulation.

High Discharge Air Temperature

Troubleshooting elevated discharge air temperatures.

Excessive Oil Consumption

Identifying and resolving high oil usage.

Oil Carryover Problems

Causes and solutions for oil entering the air system.

Troubleshooting Voltage Problems

Effects of High and Low Voltages

How voltage variations impact compressor performance.

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