Gardner Denver VST55-90B Operating And Service Manual
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Gardner Denver VST55-90B Operating And Service Manual

Gardner Denver VST55-90B Operating And Service Manual

Variable speed two-stage stationary base-mounted compressor
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13-17-618
Version: 00
Dec 7, 2018
VARIABLE SPEED
TWO-STAGE
STATIONARY BASE-MOUNTED
COMPRESSOR
AirSmart CONTROLLER
MODELS
VST55-90B
55-75-90kW
60HZ
OPERATING AND
SERVICE MANUAL

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Summary of Contents for Gardner Denver VST55-90B

  • Page 1 13-17-618 Version: 00 Dec 7, 2018 VARIABLE SPEED TWO-STAGE STATIONARY BASE-MOUNTED COMPRESSOR AirSmart CONTROLLER MODELS VST55-90B 55-75-90kW 60HZ OPERATING AND SERVICE MANUAL...

  • Page 2: Maintain Compressor Reliability And Performance With Genuine Gardner Denver Compressor Parts And Support Services

    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.

  • Page 3: Warning - Prohibition - Mandatory Label Information

    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.
  • 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.

  • Page 5: Safety Precautions

    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 could result in injury to or death of personnel.

  • Page 6: Table Of Contents

    TABLE OF CONTENTS Maintain Compressor Reliability And Performance With Genuine Gardner Denver Compressor Parts And Support Services ............................1 Instructions For Ordering Repair Parts ......................1 Warning – Prohibition – Mandatory Label Information ................2, 3 Safety Precautions ............................4 Index ................................

  • Page 7: Index

    INDEX Air Filter ............55 Oil Reservoir Drain........... 16 Air Filter, Section 7 ........... 55 Oil System Air Flow In The Compressor System ....8 Addition Of Oil Between Changes ....44 Air-Cooled Units, Location ....... 15 Compressor ..........41 Auxiliary Air Receiver ........

  • Page 8: List Of Illustrations

    LIST OF ILLUSTRATIONS Figure 1-1 – Compression Cycle ........................8 Figure 1-2 – Package Illustration (Air-Cooled) – External Details .............. 10 Figure 1-3 – Package Illustration (Air-Cooled) – Internal Details ..............11 Figure 1-4 – Package Illustration (Water-Cooled) – External Details ............12 Figure 1-5 –...

  • Page 9: Section 1, General Information

    GENERAL INFORMATION Figure 1-1 – COMPRESSION CYCLE COMPRESSOR – Your Gardner Denver Rotary Screw package is fitted with two (2) in-series single stage, positive displacement rotary compressors using meshing helical rotors to effect compression. Each pair of rotors is supported between high capacity anti-friction bearings located outside the compression chamber.
  • Page 10 LUBRICATION, COOLING AND SEALING (Figure 4-2, page 32) - Oil is forced by differential pressure from the oil reservoir through the oil cooler, thermostatic mixing valve, oil filter, distribution manifold, and enters the compressors and inter-stage manifold. A portion of the oil is directed to internal passages, on both 1st and 2nd stage airends, to lubricate the bearings and shaft oil seals.

  • Page 11: Figure 1-2 - Package Illustration (Air-Cooled) - External Details

    300ETK804-D (Ref. Drawing) Page 1 of 2 Figure 1-2 – PACKAGE ILLUSTRATION (AIR-COOLED) – External Details...

  • Page 12: Figure 1-3 - Package Illustration (Air-Cooled) - Internal Details

    300ETK804-D (Ref. Drawing) Page 2 of 2 Figure 1-3 – PACKAGE ILLUSTRATION (AIR-COOLED) – Internal Details...

  • Page 13: Figure 1-4 - Package Illustration (Water-Cooled) - External Details

    301ETK804-D (Ref. Drawing) Page 1 of 2 Figure 1-4 – PACKAGE ILLUSTRATION (WATER-COOLED) – External Details...

  • Page 14: Figure 1-5 - Package Illustration (Water-Cooled) - Internal Details

    301ETK804-D (Ref. Drawing) Page 2 of 2 Figure 1-5 – PACKAGE ILLUSTRATION (WATER-COOLED) – Internal Details...

  • Page 15: Section 2, Installation

    SECTION 2 INSTALLATION GENERAL - On receipt of the unit, check for any damage that may have been incurred during transit. Report any damage or missing parts as soon as possible. Do not electric weld on the compressor or base; bearings can be damaged by passage of current.

  • Page 16: Figure 2-1 - Typical Compressor Room

    a source of adequate cooling air, or to direct cooling air in and out of the compressor package to prevent re-circulation (e.g., not cooling the air entering the fresh air inlet). The package is designed to operate at ambient temperatures ranging from 40F to 113F (at up to 1000 meter elevation). Contact your local distributor for package operation at conditions exceeding the stipulated values.
  • Page 17 Do not block flow of air entering or exiting the enclosure - allow 3-1/2 feet (1.1 m) clearance to the nearest obstruction all around and on top. FOUNDATION - The Gardner Denver Rotary Screw compressor requires no special foundation, but should be mounted on a smooth, solid surface and as near level as possible. Temporary installation may be made at a maximum 10...

  • Page 18: Figure 2-2 - Inlet Line Lengths

    OPTIONAL MOISTURE SEPARATOR/TRAP – The unit can be provided with an optional stand-alone combination moisture separator and trap that is field-installed downstream of the aftercooler. CONTROL PIPING - Control piping is not necessary since the Gardner Denver compressor package is factory wired and piped for the control system specified.
  • Page 19 DISCHARGE SERVICE LINE - The discharge service line connection on both water-cooled and air- cooled units is located at the center roof area of the enclosure. Gardner Denver compressor packages are inherently isolated from the service line by their own minimum pressure/check valves. Installer or end user must ensure that other compressors that are piped into a common pipe manifold with the Gardner Denver compressor package are each provided with an isolation check valve.

  • Page 20: Figure 2-3 - Package Maximum Current Consumption Summary

    (VFD’s) to control compressors and cooling fan motors. The indicated Gardner Denver guidelines for proper wiring, grounding, and feed power conditioning must be followed in order to protect the VFD electronics. Failure to do so will void your warranty.

  • Page 21: Figure 2-4 - Line Reactor Sizing Recommendations

    Electrical Wire Routing – Routing of the electrical power wires into the electrical hardware enclosure is best done through its roof area. Line Reactor – A line reactor provides conditioning of the electrical power supply to the compressor package by attenuating noise and fluctuations. It shall be required in your particular application if any of the following conditions exist: ...

  • Page 22: Section 3, Starting & Operating Procedures

    – typical level is middle of gauge under running conditions. Do not mix different type oils. When the unit is shipped, it is filled with Gardner Denver AEON™ 9000TH lubricating coolant, suitable for the first 8000 hours under normal operating conditions.
  • Page 23 Figure 4-3 thru Figure 4-11, pages 33 thru 41, for general wiring diagrams and Section 2, page 14 for installation instructions. Grounding - Equipment must be properly grounded according to Gardner Denver Guidelines for proper wiring, grounding and feed power conditioning.
  • Page 24  Start/Stop controller to bump enclosure (roof) ventilation fan. Proper rotation is achieved when ventilation air is discharged through roof vent.  Energize package electrical power supply to start electrical box ventilation fans (two). Proper rotation is achieved when ventilation air is discharged through rear (electrical box) filter grills. Operation with incorrect motor rotation can damage equipment and cause oil eruption from the compressor inlet.
  • Page 25 Since the Target Pressure setting is under the Operation Adjustment menu, press Enter again to access that sub-menu OPERATION ADJUSTMENT LANGUAGE-LANGUAGE ENGLISH (US) (SELECT PARAMETER) The Target Pressure is the second item in the Operation Adjustment sub-menu so press the Down button to navigate to the Target Pressure setting.
  • Page 26  Setting the Unload and Load Pressure After setting the Target Pressure, set the Unload and Load Pressures values in a similar fashion. The Unload pressure is the third item in the Operation Adjustment sub-menu so press the Down button to navigate to the Unload Pressure setting. The Unload Pressure will control at which pressure the compressor unload and stops.
  • Page 27 Unit Hot - Start-up instructions are the same as that of a cold start. DAILY CHECK - Refer to Section 14, page 73 “Maintenance Schedule”. STOPPING THE UNIT - Press “STOP-RESET” button. The oil reservoir will automatically blow down, as the motors are de-energized.
  • Page 28 Operation of the unit with improper pressure relief valve setting can result in severe personal injury or machine damage. Ensure properly set valves are installed and maintained. 13-17-618 Page 27...

  • Page 29: Section 4, Controls & Instrumentation

    SECTION 4 CONTROLS & INSTRUMENTATION GENERAL DESCRIPTION - The Gardner Denver rotary screw compressor package is pre-wired with all electrical components suitable for the voltage and horsepower at time of order. It is necessary only to connect the compressor unit to the correct power supply and to the shop air supply network - and to the appropriate water supply if using the water-cooled variant.

  • Page 30: Figure 4-1 - Electrical Enclosure Hardware

    308ETK810-E (Ref. Drawing) Item Description Item Description Control Assembly Fuse Holder Key Pad Fuse Variable Frequency Drive Fuse Holder Variable Frequency Drive (Air-Cooled only) Fuse Cable Starter Splitter Fuse Resistor Overload Relay Control Box Terminal Block Filter Terminal Block 10 Fan/Filter Terminal Block 11 Emergency Stop Operator Terminal Block...
  • Page 31 Fan VFD and Motors - The radial fan providing cooling air for the heat exchangers is driven by an inverter-duty (TEFC) electric motor, which in turn is energized by a pulse-width modulated, variable frequency drive (commonly referred to as VFD). This combination of components enables the controller to match the heat exchanger coolant needs in proportion with load level (e.g., flow capacity) of the compressor package, thus saving fan power.
  • Page 32 Inlet Feed Valve (C) - This (three-way solenoid) device supplies/vents the required pneumatic signal to actuate the poppet valve. When energized, it vents the air signal from the inlet poppet valve, allowing it to open and when de-energized, it supplies the air signal to the inlet poppet valve, forcing it closed. Note that this pilot operated valve requires 37 to 40 psig pressure, at its intake port, to achieve its normally open position (de-energized).

  • Page 33: Figure 4-2 - Piping And Instrumentation Illustration

    300ETK797-C (Ref. Drawing) Figure 4-2 – PIPING AND INSTRUMENTATION ILLUSTRATION...

  • Page 34: Figure 4-3 - Wiring Diagram - (Air-Cooled) Two-Stage Vs Control

    303ETK546-A (Ref. Drawing) Page 1 of 5 Figure 4-3 – WIRING DIAGRAM – (AIR-COOLED) Two-Stage VS Control...

  • Page 35: Figure 4-4 - Wiring Diagram - (Air-Cooled) Two-Stage Vs Control

    303ETK546-A (Ref. Drawing) Page 2 of 5 Figure 4-4 – WIRING DIAGRAM – (AIR-COOLED) Two-Stage VS Control...

  • Page 36: Figure 4-5 - Wiring Diagram - (Air-Cooled) Two-Stage Vs Control

    303ETK546-A (Ref. Drawing) Page 3 of 5 Figure 4-5 – WIRING DIAGRAM – (AIR-COOLED) Two-Stage VS Control...

  • Page 37: Figure 4-6 - Wiring Diagram - (Air-Cooled) Two-Stage Vs Control

    303ETK546-A (Ref. Drawing) Page 4 of 5 Figure 4-6 – WIRING DIAGRAM – (AIR-COOLED) Two-Stage VS Control...
  • Page 38 303ETK546-A (Ref. Drawing) Page 5 of 5 Figure 4-7 – WIRING DIAGRAM – (AIR-COOLED) Two-Stage VS Control...

  • Page 39: Figure 4-7 - Wiring Diagram - (Water-Cooled) Two-Stage Vs Control

    304ETK546-A (Ref. Drawing) Page 1 of 5 Figure 4-8 – WIRING DIAGRAM – (WATER-COOLED) Two-Stage VS Control...

  • Page 40: Figure 4-9 - Wiring Diagram - (Water-Cooled) Two-Stage Vs Control

    304ETK546-A Ref. Drawing) Page 2 of 5 Figure 4-9 – WIRING DIAGRAM – (WATER-COOLED) Two-Stage VS Control...

  • Page 41: Figure 4-10 - Wiring Diagram - (Water-Cooled) Two-Stage Vs Control

    304ETK546-A (Ref. Drawing) Page 3 of 5 Figure 4-10 – WIRING DIAGRAM – (WATER-COOLED) Two-Stage VS Control...
  • Page 42 304ETK546-A (Ref. Drawing) Page 4 of 5 Figure 4-11 – WIRING DIAGRAM – (WATER-COOLED) Two-Stage VS Control...
  • Page 43 304ETK546-A (Ref. Drawing) Page 5 of 5 Figure 4-12 – WIRING DIAGRAM – (WATER-COOLED) Two-Stage VS Controll...

  • Page 44: Section 5, Compressor Lubrication - Separation, Filtration And Controls

    AEON 9000TH lubricant is available through your authorized Gardner Denver compressor distributor. OIL SPECIFICATIONS - The factory fill compressor lubricant is Gardner Denver AEON 9000TH lubricating coolant for all-year-round operation. This is a polyol ester (POE) synthetic lubricant specially formulated for high operating temperatures (210F to 225F), which can extend change intervals up to 4...
  • Page 45 Use of improper lubricants will cause damage to equipment. Do not mix different types of lubricants or use inferior lubricants. All materials used in Gardner Denver compressor units are compatible with AEON 9000TH Synthetic Lubricating Coolant. Use caution when selecting downstream components such as lubricating bowls, gaskets and valve trim.
  • Page 46 OIL SIGHT GLASS - This device indicates oil level within the air/oil reservoir – See Figure 5-1 for details. Figure 5-1 – OIL LEVEL SIGHT GLASS To ensure best performance from the oil separation system, adhere to the following guidelines: ...
  • Page 47 (e.g., very dusty, high humidity, etc.), may require more frequent oil changes. Gardner Denver offers a free oil analysis program with our AEON 9000TH lubricant. The first sample from a new unit should be sent in between 40-100 hours of operation.
  • Page 48 If the unit is not elevated high enough to use the oil reservoir drain line to drain oil, a small hand, electric or air operated pump should be used to drain reservoir through the oil filler opening or from the drain valve. If the unit is elevated so that the oil reservoir drain can be used, empty the oil reservoir through the drain valve to a suitable container or sump.

  • Page 49: Figure 5-1 - Thermostatic Mixing Valve Element

    OIL MIXING VALVE – This device, located at the inlet side of the oil cooler, mixes cooled and hot oil prior to delivery to the oil filter and oil injection manifold. It helps to maintain a minimum oil temperature of approximately 140F at low load level or low ambient temperature conditions.

  • Page 50: Figure 5-2 - Pressure Dew Point Of Compressed Air

    Pressure Dew Point Trend Ambient Temp - °F 100psig 125psig 150psig 175psig Figure 5-4 – PRESSURE DEW POINT OF COMPRESSED AIR OIL SEPARATION RESERVOIR / COALESCING ELEMENT - This device serves multiple functions in the compressor package:  Air/oil centrifugal separation - The bulk of the liquid oil is separated, by centrifugal effects, away from the compressed air and aerosol streams, which is then gravity-collected at the bottom of the rerservoir.

  • Page 51: Figure 5-3 - Oil Coalescing Element

    Figure 5-5 – OIL COALESCING ELEMENT Separation performance - The package oil separation system has been designed to yield 2ppm total oil carryover at the discharge of the air/oil reservoir – the oil content level at the discharge of the package will be lower and will depend on the amount of moisture rejected by the aftercooler.
  • Page 52 Oil Coalescing Element Service – Use the following procedures to replace or inspect the element: Be sure the unit is completely off and that oil pressure is depressurized. Disconnect, lockout and tagout power supply to the compressor package. Remove screws holding the top plate to the oil separator vessel and lift the top plate away. Lift the element from the reservoir.

  • Page 53: Section 6 - Heat Exchangers (Oil, Air), Axial Cooling Fans

    SECTION 6 HEAT EXCHANGERS (OIL, AIR), AXIAL COOLING FANS Compressor, air/oil reservoir, separator chamber and all piping and tubing may be at high temperature during and after operation. Do not attempt inspection or cleaning of air-cooled heat exchangers until cooling fan has stopped rotating. Disconnect, lockout and tagout package from power supply.

  • Page 54: Figure 6-1 - Air Flow Chart

    2000 Figure 6-1 – AIR FLOW CHART All the required hardware, mechanical and electrical connections have been made at the Gardner Denver factory, thus the only regular maintenance required is to keep the exterior core fins free from dirt and other airborne debris per the following procedure: Air-cooled heat exchanger cores are fabricated from aluminum.

  • Page 55: Figure 6-2 - Cooler Housing Side Covers

    5. Inspect core area. If blocked with debris, use a moderate (e.g., 100psi) source of compressed air and/or water while directing nozzle (pointed through core to outside) to dislodge debris and clean. Vacuum (applied from outside) can also be employed to clean the heat exchanger cores. Remove all loose debris and water from cooler box after cleaning process is complete.

  • Page 56: Figure 6-3 - Water-Cooled Heat Exchanger Coolant Requirements

    All the required hardware, mechanical and electrical connections have been made at the Gardner Denver factory. Regular maintenance is required to keep the interior core areas free from dirt and other fowling agents.

  • Page 57: Figure 6-4 - Water Control Valve

    Figure 6-4 – WATER CONTROL VALVE Adjustments – The regulator valve shall be adjusted so that it closes when the cooling water entering and exiting the package are at the same temperature – a condition that is present after the compressors have stopped and the heat exchangers have cooled down.

  • Page 58: Section 7, Air Filter

    In turn, the longevity of the filter element depends on the cleanliness of the local environment. NOTICE Use only genuine Gardner Denver air filter elements on Gardner Denver compressor units. Genuine parts are available through your authorized Gardner Denver distributor.
  • Page 59 NOTICE Never operate the unit without the air filter element. Never use elements that are damaged, ruptured or wet. Keep spare elements on hand to reduce downtime. Store elements in a protected area free from damage, dirt and moisture. Handle all parts with care. Filter Element Inspection and Replacement: 1.

  • Page 60: Section 8, Shaft Coupling

    SECTION 8 SHAFT COUPLING Figure 8-1 – COUPLING COMPONENTS Rotating machinery can cause personal injury or death. Turn the unit completely off, open the main disconnect, lockout and tagout before servicing the coupling. SHAFT COUPLING – Main motors drive their companion compressors by means of curved jaw-type couplings.

  • Page 61: Figure 8-2 - Coupling Element

     After engaging each hub on the matching recesses of the coupling element, check that the gap between the hub flats (see dimension “E” on Figure 8-2) is no less than 1.10/1.18 inches (28/30 mm) A smaller gap will produce abnormal wear of the element by friction and excessive thermal expansion –...

  • Page 62: Figure 8-3 - Motor Removal Hardware

    300ETK810-C (Ref. Drawing) Figure 8-3 – MOTOR REMOVAL HARDWARE  Remove coupling guard by removing four bolts  Remove two bolt/nut/washer combos securing [main motor] rear support to baseframe.  Insert temporary support between adaptor casting and support frame (e.g., wood beam) to maintain compressor level when main motor is retrieved.
  • Page 63 Interference-fitted Coupling Hub Installation and Removal – In the event that a coupling hub has to be removed, please note that these are designed to fit on compressor and motor shafts with a transitional interference fit. Coupling hubs and their companion shafts which have bore diameter which fall in the interference range of the design fit, must be installed or removed with the aid of a pulling tool and/or heat dilation.
  • Page 64 Make sure to use suitable heat protective gloves and clothes. NOTICE If heat was applied to the [compressor] coupling hub during its removal, there is the possibility that the companion shaft seal has been damaged and it must be replaced. Contact Gardner Denver for further instructions. 13-17-618 Page 63...

  • Page 65: Figure 8-4 - Coupling Installation Tool Kit

    303SBK810-A (Ref. Drawing) Figure 8-4 – COUPLING INSTALLATION TOOL KIT Figure 8-5 – COUPLING REMOVAL TOOL KIT 13-17-618 Page 64...

  • Page 66: Section 9, Minimum Pressure/Check Valve

    If the valve fails to function, check the valve stem O-ring for sealing, valve orifices for restriction, or valve and valve seat for burrs and dirt. Repair kits are available from your local authorized Gardner Denver distributor. Before servicing the minimum pressure valve, always stop the unit, release air pressure, lockout and tagout the power supply to the compressor package.

  • Page 67: Figure 9-1 - Minimum Discharge Pressure/Check Valve

    Figure 9-1 – MINIMUM DISCHARGE PRESSURE/CHECK VALVE 13-17-618 Page 66...

  • Page 68: Section 10, Inlet Control Valve

    SECTION 10 INLET CONTROL VALVE INLET CONTROL VALVE – This device is located at the intake flange of the compressor. During compressor stoppage, planned or accidental (e.g. power failure), it blocks off the compressor intake and allows it to remain pressurized and ready for quick re-start. A spring-loaded check feature is provided as added insurance against air or oil backflow During compressor operation, the underside of the poppet is vented to atmosphere via a 3-way solenoid valve, allowing the poppet to fall (open) and feed fresh air to the compressor inlet-the spring loaded check...
  • Page 69 Inlet Control Valve (Body) Inspection - The valve does not require maintenance or lubrication. If air/oil leaks develop across the valve disc during pressurized conditions (e.g., machine stopped), valve seat and disc should be inspected for wear and tear signs: 1.

  • Page 70: Section 11, Pressure Relief Valve

    SECTION 11 PRESSURE RELIEF VALVE Pressure Relief Valve - This device protects the pressure-containing components of the compressor package against pressures accidentally exceeding 200 psig. It is installed on the dry-side of the oil separation reservoir. Figure 11-1 – PRESSURE RELIEF VALVE 13-17-618 Page 69 11-1...
  • Page 71 Before inspecting the pressure relief valve, release air pressure, lockout and tagout the power supply to the compressor package. Failure to release pressure or properly disconnect the power may result in personal injury or death. Never paint, lubricate or alter a relief valve. Do not plug vent or restrict. Operation of the unit with improper relief valve setting can result in severe personal injury or machine damage.

  • Page 72: Section 12, Ventilation Fans, Filters (Electrical Enclosure)

    SECTION 12 VENTILATION FANS, FILTERS (ELECTRICAL ENCLOSURE) Ventilation Fans/Filters - The electronics housed in the standard IP54 enclosure box are ventilated by a combination of dual intake air filters and dual discharge air filters with electric fans. Refer to Figure 4-1, page 29 in the Controls and Instrumentation Section 4, page 28 of this manual for location details.

  • Page 73: Section 13, Motor Lubrication

    SECTION 13 MOTOR LUBRICATION Rotating machinery can cause injury or death. Open main disconnect, lockout and tagout power supply to compressor package before working on the electric motor. Motor Lubrication - Long time satisfactory operation of an electric motor depends in large measure on proper lubrication of the bearings.

  • Page 74: Section 14, Maintenance Schedule

    SECTION 14 MAINTENANCE SCHEDULE SERVICE CHECK LIST Daily Checks:  Air Filter (Compressor) - Replace when controller displays “CHANGE AIR FILTER” message. Refer to Section 7, page 55 for air filter details.  Oil Separator Element - Replace when controller displays “CHANGE OIL SEPARATOR ELEMENT”. Refer to Section 5, page 41 for oil separator element details.
  • Page 75 Yearly Checks:  Heat Exchangers (air and water-cooled) – Check cooling performance of air and oil cores – see Section 6, page 49 of this manual for details on typical performance expectations as well as recommended cleaning procedures.  Pressure Relief Valve – Check operation of device – see Section 11, page 67 for test procedure. ...

  • Page 76: Section 15, Troubleshooting

    Manual 13-17-600. Remote Contact is open Replace switch or jumper. Compressor lock-up Confirm compressor shaft is not free to turn, then call Gardner Denver for further instructions. See “High Discharge Air Temperature”, this section. See “High Discharge Air Compressor High discharge temperature Temperature,”...
  • Page 77 Restriction in service piping Inspect and clean service piping. Restriction in control tubing Inspect and clean control tubing. Compressor Acceleration time in VFD set too Contact your Gardner Denver starts too long distributor. slowly Minimum Pressure/Check Valve Repair or replace.
  • Page 78 SYMPTOM POSSIBLE CAUSE REMEDY See “Oil Carryover” in this section. Excessive oil Oil separation malfunction consumption Oil leaks at fittings and gaskets Detect and correct oil leaks. Shaft seal leaking Inspect or replace shaft seal. High discharge Thermostatic mixing valve stuck Inspect or replace valve.
  • Page 79 Ruptured oil separator Replace element. element. Loose assembly Tighten all fittings and gaskets. Foam caused by use of Use Gardner Denver AEON 9000TH incorrect oil oil only. Minimum pressure valve Repair or replace. malfunction – discharge pressure below 80 psig...
  • Page 80 Regular maintenance in accordance with the service manual is required. Use of genuine Gardner Denver OEM parts and lubricants are highly recommended. If a component failure is deemed a result of using non-genuine Gardner Denver parts and lubricants, warranty will not be allowed.
  • Page 81 NOTES...
  • Page 82 NOTES...
  • Page 83 NOTES...
  • Page 84 For additional information, contact your local representative or visit: www.contactgd.com/compressors ©2018 Gardner Denver, Inc. Printed in U.S.A.

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