Gardner Denver L4-5C Fiche d'information produit

L-SERIES FRAME 0

SINGLE STAGE

BASE-MOUNTED &

TANK-MOUNTED

COMPRESSOR

Original User &

Service Manual

MODELS:

L4-5C

5 & 7.5 HP

4 & 5 kW

13-25-629

Version 03

March 19, 2021

13-25-629 v03 Page 2

MAINTAIN COMPRESSOR RELIABILITY AND PERFORMANCE WITH

GENUINE GARDNER DENVER® COMPRESSOR PARTS AND SUPPORT SERVICES

Gardner Denver®Compressor genuine parts, manufactured to design tolerances, are developed for optimum

dependability, specifically for Gardner Denver compressor systems. Design and material innovations are the result of

years of experience with hundreds of different compressor applications. Reliability in materials and quality assurance

is incorporated in our genuine replacement parts.

Your authorized Gardner Denver Compressor distributor offers all the backup you’ll need. An AirSmart™network of

authorized distributors provides the finest product support in the air compressor industry.

Your authorized distributor can support your Gardner Denver air compressor with these services:

1. Trained parts specialists to assist you in selecting the correct replacement parts.

2. A full line of factory tested compressor lubricants specifically formulated for use in Gardner Denver

compressors.

3. Repair and maintenance kits designed with the necessary parts to simplify servicing your compressor.

Authorized distributor service technicians are factory trained and skilled in compressor maintenance and repair. They

are ready to respond and assist you by providing fast, expert maintenance and repair services.

To Contact Gardner Denver or locate your local distributor:

Visit: www.contactgd.com/compressors

Call: (800) 682-9868

INSTRUCTIONS FOR ORDERING REPAIR PARTS

When ordering parts, specify Compressor MODEL, Method of Cooling, HORSEPOWER and SERIAL NUMBER (see

nameplate on unit). The Airend Serial Number is also stamped on top of the discharge bearing carrier casting.

All orders for Parts should be placed with the nearest authorized distributor.

Where NOT specified, quantity of parts required per compressor or unit is one (1); where more than one is required

per unit, quantity is indicated in parenthesis. SPECIFY EXACTLY THE NUMBER OF PARTS REQUIRED.

DO NOT ORDER BY SETS OR GROUPS.

To determine the Right-Hand and Left-Hand side of a compressor, stand at the motor end and look toward the

compressor. Right-Hand and Left- Hand are indicated in parenthesis following the part name, i.e. (RH) and (LH),

when appropriate.

13-25-629 v03 Page 3

WARNING –PROHIBITION –MANDATORY LABEL INFORMATION

Gardner Denver Rotary Screw compressors are the result of advanced engineering and skilled

manufacturing. To be assured of receiving maximum service from this machine, the owner must exercise

care in its operation and maintenance. This book is written to give the operator and maintenance

department essential information for day-to-day operation, maintenance and adjustment. Careful

adherence to these instructions will result in economical operation and minimum downtime.

Boxed text formats are used, within this manual, to alert users of the following

conditions:

Safety Labels are used, within this manual and affixed to the appropriate areas of

the compressor package, to alert users of the following conditions:

Indicates a hazard with a high level of risk, which if not avoided, WILL result in death or serious

injury.

Equipment Starts Automatically

Cutting of Finger or Hand Hazard –Rotating

Impeller Blade

Cutting of Finger or Hand Hazard –Rotating Fan

Blade

Health Hazard –Explosive Release of Pressure

High Voltage –Hazard of Shock, Burn, or Death

Present until Electrical Power is Removed

Entanglement of Fingers or Hand/Rotating Shaft

13-25-629 v03 Page 4

Indicates a hazard with a medium level of risk which, if not avoided, COULD result in death or

serious injury.

Asphyxiation Hazard –Poisonous Fumes or Toxic Gases in Compressed Air

Indicates a hazard with a low level of risk which, if not avoided, MAY result in a minor or

moderate injury.

Burn Hazard –Hot surface

PROHIBITION/MANDATORY ACTION REQUIREMENTS

Do not Operate Compressor with Guard Removed

Do Not Lift Equipment with Hook –No Lift Point

Handle Package at Forklift Points Only

Lockout Electrical Equipment in De-Energized

State

Loud Noise Hazard –Wear Ear Protection

Read the Operator’s Manual Before Proceeding

with Task

13-25-629 v03 Page 5

SAFETY PRECAUTIONS

Safety is everybody’s business and is based on your use of good common sense. All situations or

circumstances cannot always be predicted and covered by established rules. Therefore, use your past

experience, watch out for safety hazards and be cautious. Some general safety precautions are given

below:

Failure to observe these notices will result in injury to or death of personnel.

Keep fingers and clothing away from rotating fan, drive coupling, etc.

Disconnect the compressor unit from its power source, lockout and tagout before working on the

unit –this machine is automatically controlled and may start at any time.

Do not loosen or remove the oil filler plug, drain plugs, covers, the thermostatic mixing valve or

break any connections, etc., in the compressor air or oil system until the unit is shut down and

the air pressure has been relieved.

Electrical shock can and may be fatal.

Perform all wiring in accordance with the National Electrical Code (NFPA-70) and any applicable

local electrical codes. Wiring and electrical service must be performed only by qualified

electricians.

Open main disconnect switch, lockout and tagout and check for voltage before working on the

control.

Failure to observe these notices could result in damage to equipment.

Stop the unit if any repairs or adjustments on or around the compressor are required.

Do not use the air discharge from this unit for breathing, not suitable for human consumption.

An Excess Flow Valve should be on all compressed air supply hoses exceeding 1/2" inside

diameter (OSHA Regulation, Section 1926.302).

Do not exceed the rated maximum pressure values shown on the nameplate.

Do not operate unit if safety devices are not operating properly. Check periodically. Never bypass

safety devices.

13-25-629 v03 Page 6

TABLE OF CONTENTS

Maintain Compressor Reliability And Performance With Genuine Gardner Denver Compressor Parts And

Support Services.........................................................................................................................................2

Instructions For Ordering Repair Parts .......................................................................................................2

Warning –Prohibition –Mandatory Label Information ................................................................................3

Safety Precautions...................................................................................................................................... 5

Section 1, General Information ...................................................................................................................7

Section 2, Installation................................................................................................................................ 11

Section 3, Starting & Operating Procedures ............................................................................................. 17

Section 4, Controls & Instrumentation.......................................................................................................22

Section 5, Lubrication. Oil Cooler, Oil Filter & Separator..........................................................................40

Section 6, Heat Exchangers (Oil/Air) ........................................................................................................48

Section 7, Air Filters..................................................................................................................................51

Section 8, Belt Drive System..................................................................................................................... 53

Section 9, Servicing Of Miscellaneous Devices........................................................................................56

Section 10, Tank Mounted Compressor - Total System............................................................................64

Section 11, Maintenance Schedule...........................................................................................................65

Section 12, Troubleshooting ..................................................................................................................... 67

This manual covers the following models:

PSIG

Air Cooled

Parts List

Controller Manual

5 & 7.5

110, 130, 190

L4-5C

13-25-549

ZS1054347

13-25-629 v03 Page 7

SECTION 1

GENERAL INFORMATION

Figure 1-1 COMPRESSOR CYCLE

COMPRESSOR - The rotary screw compressor is a single stage, positive displacement rotary machine

using meshing helical rotors to effect compression. Both rotors are supported between high capacity anti-

friction bearings located outside the compression chamber. Roller bearings are used at the inlet end of

the rotors to carry part of the radial loads. Angular contact ball and roller bearings at the discharge end

locate each rotor axially and carry all thrust loads and the remainder of the radial loads.

COMPRESSION PRINCIPLE (Figure 1-1)Compression is accomplished by the main and secondary

rotors synchronously meshing in a one-piece cylinder. The main rotor has five (5) helical lobes 90apart.

The secondary rotor has six (6) matching helical grooves 72apart to allow meshing with main rotor

lobes.

The air inlet port is located on top of the compressor cylinder near the drive shaft end. The discharge port

is near the bottom at the opposite end of the compressor cylinder. Figure 1-1 is an inverted view to show

inlet and discharge ports. The compression cycle begins as the rotors unmesh at the inlet port and air is

drawn into the cavity between the main rotor lobes and the secondary rotor grooves (A). When the rotors

pass the inlet port cutoff, air is trapped in the interlobe cavity and flows axially with the meshing rotors (B).

As meshing continues, more of the main rotor lobe enters the secondary rotor grove, normal volume is

reduced and pressure increases.

Oil is injected into the cylinder to remove the heat of compression and seal internal clearances. Volume

reduction and pressure increase continues until the air/oil mixture trapped in the interlobe cavity by the

rotors passes the discharge port and is released to the oil reservoir (C). Each rotor cavity follows the

same “fill-compress-discharge” cycle in rapid succession to produce a discharge air flow that is

continuous, smooth and shock free.

AIR FLOW IN THE COMPRESSOR SYSTEM (Figure 1-3) Air enters the air filter and passes through the

inlet unloader valve and on into the compression chamber where oil is injected into the air. After

compression, the air/oil mixture passes into the oil reservoir where most of the entrained oil is removed by

velocity change and impingement and drops back into the reservoir. The air and remaining oil then

passes through the air/oil separator. The air then passes through the minimum pressure/check valve, the

after cooler and the optional moisture separator and into the plant air lines.

LUBRICATION, COOLING AND SEALING - Oil is forced by air pressure from the oil reservoir through

the oil cooler, thermostatic mixing valve, and oil filter and discharge into the compressor main oil gallery.

A portion of the oil is directed through internal passages to the bearings and shaft oil seal. The balance

of the oil is injected directly into the compression chamber to remove heat of compression, seal internal

clearances and lubricate the rotors.

13-25-629 v03 Page 8

Figure 1-2 COMPRESSOR ILLUSTRATION, EXTERNAL DETAILS

302ECA797-A

(Ref. Drawing)

Page 1 of 2

13-25-629 v03 Page 9

Figure 1-3 COMPRESSOR ILLUSTRATION, INTERNAL DETAILS

302ECA797-A

(Ref. Drawing)

Page 2 of 2

13-25-629 v03 Page 10

Figure 1-4 COMPRESSOR ILLUSTRATION, TOTAL SYSTEM

(L4-5 Base Model with 120 gallon receiver and XGNC dryer shown)

307ECA804-A

(Ref. Drawing)

Page 1 of 2

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