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13-8-638   Page 19 

Oil Level Gauge - 

This gauge is located on the oil reservoir and indicates the oil level.  See “Oil Level 

Gauge”, Figure 5-4, page 30, for how to read oil level. 

 
Minimum Discharge Pressure/Check Valve - 

An internal spring-loaded minimum pressure valve is used 

in the final discharge line to provide a positive pressure on the coolant system of the compressor even if 
the air service valve is fully open to atmospheric pressure.  This valve also functions as a check valve to 
prevent back flow of air from the shop air line when the unit stops, unloads, or is shut down. 
 
The valve incorporates an orifice which, when air is flowing through it, maintains pressure in the oil 
reservoir.  A spring-loaded piston valve senses air pressure on the upstream (reservoir) side of the valve. 
When the system pressure rises, the spring is overridden and the valve opens to full porting. 
 

Inlet Valve 

(Figure 4-1, page 17) 

The Inlet valve restricts the inlet to control delivery and closes to 

unload the compressor.  At shutdown, the inlet valve closes to prevent the back flow of air. 
 
The inlet valve position is controlled by air pressure in its piston cylinder, which is controlled by the 
"AUTOSENTRY

®

" through the magnetic unloader solenoid valve.  When the top of the cylinder is 

pressurized, the inlet opens for full air delivery.  When pressure is relieved from the cylinder, the inlet 
valve closes to restrict air flow and compressor delivery. 
 

Magnetic Unloader Solenoid Valve 

(Figure 4-1, page 17) 

This valve controls the position of the inlet 

valve in response to signals from the "AUTOSENTRY

®

".  When de-energized, pressure is relieved from 

the top of the inlet valve cylinder to unload the compressor.  When the solenoid valve is energized, 
reservoir pressure is supplied to the top of the cylinder to load the compressor. 
 

Check Valve 

(Figure 4-1, page 17) 

This valve is normally closed while the compressor is loaded or 

stopped.  While running unloaded, it opens to admit a small amount of purge air to the compressor inlet.  
This reduces compressor knock, and provides enough air to pressurize the controls during startup. 
 

Blowdown Valve 

(Figure 4-1, page 17) 

The blowdown valve is a two-way solenoid valve which is piped 

into the oil reservoir outlet ahead of the minimum pressure valve.  When the solenoid is de-energized, the 
valve opens and the coolant system is blown down.  When the solenoid is energized, the valve closes to 
allow the coolant system to pressurize. 
 

Purge Air Valve 

(Figure 4-1, page 17) – The purge valve is a two-way solenoid valve that admits purge 

air from the final discharge manifold to the compressor to counteract the oil knock that occurs in oil-
flooded rotary screw compressors when they are completely unloaded with pressure in the oil reservoir.  
This valve is controlled by the controller which allows air into the airend whenever the inlet valve closes. 
 

System Pressure Transducer 

(Figure 4-1, page 17) 

This transducer is connected after the minimum 

pressure valve.  It converts the pressure in the plant air system into an electrical signal for use by the 
"AUTOSENTRY

®

" controller for modulation and control. 

 

Reservoir Pressure Transducer 

(Figure 4-1, page 17) 

This transducer is connected to the coolant 

system.  Its signal is used to prevent loaded starts, monitor oil pressure, and to monitor the condition of 
the separator. 
 

Air Filter Vacuum Switch 

(Figure 4-1, page 17) 

This switch is used to monitor air filter condition and 

alert the user if the filter requires service or replacement. 

 
 

CAUTION 

Machine damage will occur if compressor is repeatedly restarted after any one 
of the shutdown modes stops operation of the unit.  Find and correct the 
malfunction before resuming operation. 

 

Summary of Contents for INTEGRA EFD99B

Page 1: ...GARDNER DENVER 13 8 638 Version 01 May 2 2006 INTEGRA BASE MOUNTED COMPRESSORS MODELS EFD99B 40 50 HP OPERATING AND SERVICE MANUAL...

Page 2: ...thorized Gardner Denver Air Compressor distributor refer to the yellow pages of your phone directory or contact Distribution Center Factory Gardner Denver Master Distribution Center 5585 East Shelby D...

Page 3: ...to indicate the presence of a hazard which will cause severe personal injury death or substantial property damage if the warning is ignored WARNING Warning is used to indicate the presence of a hazar...

Page 4: ...d Airends ii Foreword iii Index v List Of Illustrations vii Section 1 General Information 1 Section 2 Installation 7 Section 3 Starting Operating Procedures 14 Section 4 Controls Instrumentation 17 Se...

Page 5: ...t Recommended 24 Upgrade Procedure 28 Lubrication Motor 12 Lubrication Cooling And Sealing 1 Lubrication Oil Cooler Oil Filter Separator Section 5 24 Maintenance Schedule Section 8 40 Moisture Separat...

Page 6: ...s Operation 40 Every 8 Hours Operation 40 Every Year 40 Motor Lubrication 40 Sheave Alignment 37 Starting Operating Procedures Section 3 14 Starting The Unit 16 Unit Cold 16 Unit Hot 16 Stopping The U...

Page 7: ...tallation 9 Figure 4 1 Control Schematic 17 Figure 4 2 Key Pad 18 Figure 4 3 Wiring Diagram Full Voltage 22 Figure 4 4 Wiring Diagram Full Voltage 23 Figure 5 1 Flow Diagram 24 Figure 5 2 Approximate...

Page 8: ...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...

Page 9: ...13 8 638 Page 2 Figure 1 2 COMPRESSOR ILLUSTRATION 300EFD797 A Ref Drawing...

Page 10: ...ing not suitable for human consumption 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 unt...

Page 11: ...d tagout before working on the unit this machine is automatically controlled and may start at any time An Excess Flow Valve should be on all compressed air supply hoses exceeding 1 2 inch inside diame...

Page 12: ...13 8 638 Page 5 DECALS 206EAQ077 212EAQ077 218EAQ077 211EAQ077 207EAQ077...

Page 13: ...13 8 638 Page 6 DECALS 216EAQ077 217EAQ077 222EAQ077 221EAQ077 208EAQ077...

Page 14: ...reezing temperatures in a clean well lighted well ventilated area with ample space all around including above for maintenance If a low ceiling is encountered the hot discharge air may need to be ducte...

Page 15: ...possible install the unit near level Temporary installation may be made at a maximum 5 angle lengthwise or 5 sidewise Mounting bolts are not normally required However installation conditions such as...

Page 16: ...Service panels are provided for maintenance access Be sure to allow enough space around the unit for the panels to be removed Any of the enclosure panels may be removed by opening the latch and liftin...

Page 17: ...unsheltered outside installations should be avoided where possible Installation next to a heated building where enough heat can be used to keep the compressor room above freezing will save many compl...

Page 18: ...ed by the check valve in the unit discharge line If a rotary screw unit is manifolded to another compressor be sure the other compressor has a check valve in the line between the machine and the manif...

Page 19: ...The following charts show recommended grease qualities and regreasing intervals for ball bearing motors For additional information refer to the motor manufacturer s instructions The following procedur...

Page 20: ...EGREASING INTERVAL Type of Service Typical Rating Relubrication Interval Up to 150 HP 112 KW 18 Months Standard One or Two Shift Operation Above 150 HP 112 KW 12 Months Up to 150 HP 112 KW 9 Months Se...

Page 21: ...ter and air oil separator is necessary to achieve maximum service and extended drain intervals of AEON 4000 lubricant Use only genuine Gardner Denver filters designed and specified for this compressor...

Page 22: ...e controls to the desired load pressure DO NOT EXCEED THE MAXIMUM OPERATING PRESSURE ON THE COMPRESSOR NAMEPLATE See Operation Adjustments in the Controller Operating and Service Manual WARNING Operat...

Page 23: ...To start press STOP RESET then press RUN 3 Run for approximately five minutes or until the temperature stabilizes The unit is equipped with a minimum 70 psig pressure check valve No special procedure...

Page 24: ...rior to starting the STOP RESET key must be pressed to place the controller into its READY state as indicated on the display Compressor operation may then be started by pressing the RUN key While in a...

Page 25: ...to approximately 120 125 of the unit s full load operating pressure for protection against overpressure Periodic checks should be made to ensure its operation The relief valve should be tested for pr...

Page 26: ...is supplied to the top of the cylinder to load the compressor Check Valve Figure 4 1 page 17 This valve is normally closed while the compressor is loaded or stopped While running unloaded it opens to...

Page 27: ...ency purposes only use the keypad STOP RESET for normal controlled stopping WARNING Automatic restarting or electrical shock can cause injury or death Open and lock main disconnect and any other circu...

Page 28: ...ervoir Close the service valve 2 Disconnect lockout and tagout the power supply to the starter 3 Tighten the nut down on the minimum pressure check valve cover 4 Remove the four 4 bolts holding the co...

Page 29: ...13 8 638 Page 22 Figure 4 3 WIRING DIAGRAM FULL VOLTAGE 303EFD546 D Ref Drawing Page 1 of 2...

Page 30: ...13 8 638 Page 23 Figure 4 4 WIRING DIAGRAM FULL VOLTAGE 303EFD546 D Ref Drawing Page 2 of 2...

Page 31: ...ia an oil return line through an orifice and back into the compressor RECOMMENDED LUBRICANT Gardner Denver compressors are factory filled with AEON lubricants These lubricants are formulated to the hi...

Page 32: ...The oil should be visible in the white range a flashlight must be used of the gauge If there is only red showing on the gauge the oil level is too high and must be drained If the oil level is in the r...

Page 33: ...e 3 U S Gallons 11 Liters Bottom of Site Glass to Top of Site Glass 3 U S Quart 3 Liters Figure 5 2 APPROXIMATE OIL SYSTEM CAPACITIES OIL CHANGE INTERVAL Recommended oil change intervals are based on...

Page 34: ...he air oil reservoir 5 Close the drain valve If the drained oil and or the oil filter element are contaminated with dirt flush the entire system the reservoir oil cooler and lines Inspect the air oil...

Page 35: ...storage of oils Changing the oil will be of little benefit if done in a careless manner CAUTION Excessive oil carryover can damage equipment Never fill oil reservoir above the top of the site glass LU...

Page 36: ...ilter and reinstall used filter 4 Fill system with a 50 percent charge of the new lubricant Start the machine and stay there to observe Allow the machine to run about five minutes at temperature or un...

Page 37: ...l cooling of the oil reservoir short loaded cycle in high humidity or malfunctions of the thermal valve may result in moisture in the oil system which is detrimental to compressor lubrication and coul...

Page 38: ...il reservoir separation chamber and all piping and tubing may be at high temperature during and after operation 1 Stop unit and be sure no air pressure is in the oil reservoir 2 Disconnect lockout and...

Page 39: ...l from the air stream Oil impinging on the inside of the separator element drains directly back into the oil reservoir by gravity Oil collected outside the element is returned through tubing to the co...

Page 40: ...ir service valve located after the compressor package discharge 3 Disconnect lockout and tagout the power supply to the starter 4 Remove the minimum pressure check valve air oil separator housing cove...

Page 41: ...66 C to 74 C Install a tee at the oil filter outlet and check with a thermometer Oil Inlet Pressure Check at the fitting in the line near the compressor oil inlet With air receiver pressure at 100 ps...

Page 42: ...when inspection indicates an accumulation of dirt on the outside of the element Inspect every few days until experience determines the proper time interval for servicing To Service 1 Be certain the u...

Page 43: ...rupture crack or pin holes in the pleated media Inspection should be done by placing a bright light inside the element WARNING Do not oil this element Never operate unit without element Never use elem...

Page 44: ...are properly aligned the straight edge should touch the two outer edges of each sheave for a total of four points of contact Gaps between the outer edges of either of the sheaves and the straight edg...

Page 45: ...ure belt failure Please see Figure 7 1 page Error Bookmark not defined for proper belt tension CAUTION Interference between the fan and the orifice can damage equipment Be certain the orifice has even...

Page 46: ...13 8 638 Page 39 Motor H P No of Belts Deflection Force Pounds Deflection In Inches 40 6 6 8 5 3 8 50 6 6 8 5 3 8 Figure 7 1 BELT TENSION 3VX BELTS...

Page 47: ...ing is required clean the exterior fin surfaces of the cores by blowing compressed air carrying a nonflammable safety solvent in a direction opposite that of the cooling fan air flow This cleaning ope...

Page 48: ...Oil Separator Check Reservoir Oil Level Check for Proper Load Unload Check Dirt Accumulation on Cooler Change Oil Filter Element Clean Oil Return Strainer Change Compressor Lubricant AEON 4000 Check...

Page 49: ...otor starter overload heaters trip 4 Reset and investigate cause of overload Compressor does not unload or load 1 Improperly adjusted control 1 Refer to SECTION 4 page 17 and adjust control 2 Air leak...

Page 50: ...he compressed air system 7 Check for leaks fix any leaks found 8 V Belts broken 8 Replace 9 V Belts slipping 9 Test belt tensioning 10 Pressure limits incorrectly set 10 Check correct pressure limits...

Page 51: ...ubricating coolant 6 Inoperative minimum pressure valve 6 Replace seals in valve 7 Operation at elevated discharge temperatures 7 Reduce temperature See High Discharge Air Temperature this section 8 S...

Page 52: ...ration with lower voltages will reduce motor life and load capacity As voltages get further below the design range other symptoms may show up Low voltages may lead to high motor currents The overload...

Page 53: ...initial use or 15 months from date of shipment to first purchaser whichever occurs first LABOR TRANSPORTATION AND INSPECTION The Company will provide labor by Company representative or authorized ser...

Page 54: ...rvice Department Telephone 800 682 9868 FAX 217 224 7814 Sales and Service in all major cities For parts information contact Gardner Denver Master Distribution Center Memphis TN Telephone 800 245 4946...

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