Emerson VSG & VSSG Specifications

VSG & VSSG
Single Screw Compressor Unit
The World’s Best Compressors
For Gas Compression
TM
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Important Message
READ CAREFULLY BEFORE INSTALLING AND STARTING YOUR COMPRESSOR.
The following instructions have been prepared to assist in installation, operation and removal of Vilter Single
Screw Compressors. Following these instructions will result in a long life of the compressor with satisfactory
operation.
The entire manual should be reviewed before attempting to install, operate, service or repair the compressor.
A compressor is a positive displacement machine. It is designed to compress gas. The compressor must
not be subjected to liquid carry over. Care must be exercised in properly designing and maintaining the
system to prevent conditions that could lead to liquid carry over. Vilter Manufacturing is not responsible
for the system or the controls needed to prevent liquid carry over and as such Vilter Manufacturing cannot warrant equipment damaged by improperly protected or operating systems.
Vilter screw compressor components are thoroughly inspected at the factory. However, damage can occur
in shipment. For this reason, the equipment should be thoroughly inspected upon arrival. Any damage
noted should be reported immediately to the Transportation Company. This way, an authorized agent
can examine the unit, determine the extent of damage and take necessary steps to rectify the claim with
no serious or costly delays. At the same time, the local Vilter representative or the home office should
be notified of any claim made.
All inquires should include the Vilter sales order number, compressor serial and model number. These can be
found on the compressor name plate on the compressor.
All requests for information, services or parts should be directed to:
Vilter Manufacturing LLC
Customer Service Department
P.O. Box 8904
5555 South Packard Ave
Cudahy, WI 53110-8904 USA
Telephone: 1-414-744-0111
Fax:1-414-744-3483
e-mail: info.vilter@emerson.com
Equipment Identification Numbers:
Vilter Order Number:
Vilter Order Number:
Vilter Order Number:
Vilter Order Number:
_______________________Compressor Serial Number: _________________
_______________________Compressor Serial Number: _________________
_______________________Compressor Serial Number: _________________
_______________________Compressor Serial Number: _________________
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Table of Contents
Important Message............................................................................................. 3
VSG STANDARD VILTER WARRANTY STATEMENT................................................. 6
Long Term Storage Requirements........................................................................ 7
Description.......................................................................................................... 9
Foundation........................................................................................................ 11
Rigging and Lifting............................................................................................ 12
Installation........................................................................................................ 16
Installation & Calibration Slide Valve Actuators............................................. 21
Slide Valve Operation.................................................................................... 24
Slide Valve Actuator Trouble Shooting Guide................................................. 25
Operation Section............................................................................................. 29
Notice on using Non -Vilter Oils..................................................................... 29
Operation..................................................................................................... 30
Pre Start-Up Checklist................................................................................... 37
Maintenance................................................................................................. 39
Service.............................................................................................................. 40
Parts Section..................................................................................................... 67
Gate Rotor.................................................................................................... 68
Shaft Seal...................................................................................................... 72
Tandem Shaft Seal......................................................................................... 73
Main Rotor.................................................................................................... 74
Slide Valve Cross Shafts and End Plate........................................................... 76
Slide Valve Carriage Assembly....................................................................... 78
Actuator & Command Shaft.......................................................................... 82
Actuator & Command Shaft.......................................................................... 83
Miscellaneous Frame Components................................................................ 84
Replacement Tools........................................................................................ 88
VSG 301-701 Replacement Parts Section........................................................... 91
Gaterotor Assembly...................................................................................... 92
Shaft Seal...................................................................................................... 95
Main Rotor, Slide Valve Cross Shafts & End Plate............................................ 96
Slide Valve Carriage Assembly..................................................................... 100
Actuator & Command Shaft........................................................................ 102
Miscellaneous Frame Components.............................................................. 104
Replacement Tools...................................................................................... 108
Appendix A: Pre Start Up for Remote Oil Coolers
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VSG STANDARD VILTER WARRANTY STATEMENT
Seller warrants all new single screw gas compression units and bareshaft single screw compressors
manufactured by it and supplied to Buyer to be free from defects in materials and workmanship for a period
of (a) eighteen (18) months from the date of shipment or (b) twelve (12) months from the date of
installation at the end user’s location, whichever occurs first.
If within such period any such product shall be proved to Seller’s satisfaction to be defective, such product
shall be repaired or replaced at Seller’s option. Such repair or replacement shall be Seller’s sole obligation
and Buyer’s exclusive remedy hereunder and shall be conditioned upon (a) Seller’s receiving written notice
of any alleged defect within ten (10) days after its discovery, (b) payment in full of all amounts owed by
Buyer to Seller and (c) at Seller’s option, Buyer shall have delivered such products to Seller, all expenses
prepaid to its factory. Expenses incurred by Buyer in repairing or replacing any defective product
(including, without limitation, labor, lost refrigerant or gas and freight costs) will not be allowed except by
written permission of Seller. Further, Seller shall not be liable for any other direct, indirect, consequential,
incidental, or special damages arising out of a breach of warranty.
This warranty is only applicable to products properly maintained and used according to Seller’s
instructions. This warranty does not apply (i) to ordinary wear and tear, damage caused by corrosion,
misuse, overloading, neglect, improper use or operation (including, without limitation, operation beyond
rated capacity), substitution of parts not approved by Seller, accident or alteration, as determined by Seller
or (ii) if the product is operated on a gas with an H2S level above 100 PPM. In addition, Seller does not
warrant that any equipment and features meet the requirements of any local, state or federal laws or
regulations. Products supplied by Seller hereunder which are manufactured by someone else are not
warranted by Seller in any way, but Seller agrees to assign to Buyer any warranty rights in such products
that Seller may have from the original manufacturer. Labor and expenses for repair are not covered by
warranty.
THE WARRANTY CONTAINED HEREIN IS EXCLUSIVE AND IN LIEU OF ALL OTHER REPRESENTATIONS AND
WARRANTIES, EXPRESS OR IMPLIED, AND SELLER EXPRESSLY DISCLAIMS AND EXCLUDES ANY IMPLIED
WARRANTY OF MERCHANTABILITY OR IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE.
Any description of the products, whether in writing or made orally by Seller or Seller’s agents,
specifications, samples, models, bulletins, drawings, diagrams, engineering sheets or similar materials used
in connection with Buyer’s order are for the sole purpose of identifying the products and shall not be
construed as an express warranty. Any suggestions by Seller or Seller’s agents regarding use, application or
suitability of the products shall not be construed as an express warranty unless confirmed to be such in
writing by Seller.
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Long Term Storage Requirements
The procedure described is a general recommendation for long term storage (over one month of no operation)
of Vilter Manufacturing packages and compressors. While this procedure is intended to cover most of the
commonly encountered situations, it is the responsibility of the installation firm and end user to address any
unusual conditions. We suggest using the accompanying Long Term Storage Log sheet for recording purposes
to validate the appropriate procedures.
Prior to start-up, Vilter recommends that a complete system pressure check be performed. Upon verification
of the system integrity, a comprehensive evacuation procedure should be completed to ensure a dry system
before gas is introduced. The oil circuit of any compressor is to be primed at initial start-up through the prelube oil pump on screw compressors.
Warranty of the system remains in effect as described in Section 5, Product Warranty and Procedures.
*
If the unit is designed for indoor duty, it must be stored in a heated building.
If the unit is designed for outdoor duty, and is to be stored outdoors, a canvas tarp is recommended for
protection until installation is imminent. Adequate drainage should be provided, by placing wood blocks
under the base skid, so that water does not collect inside the base perimeter or low spots in the tarp.
*
All compressor stop valves are to be closed to isolate the compressor from the remainder of the system. All
other valves, except those venting to atmosphere, are to be open. It is essential that the nitrogen holding
charge integrity be maintained.
*
Cover all bare metal surfaces (coupling, flange faces, etc.) with rust inhibitor.
* Desiccant is to be installed in the control panel. If the panel is equipped with a space heater, it is to be
energized. If the panel does not have a space heater, use a thermostatically controlled 50-watt light bulb.
Use an approved electrical spray-on corrosion inhibitor for panel components (relays, switches, etc.)
*
All pneumatic controllers and valves (Fisher, Taylor, etc.) are to be covered with plastic bags and sealed with
desiccant bags inside.
*
System and compressor pressures (unit is shipped with dry nitrogen holding charge approximately 5 psi
above atmospheric pressure) are to be monitored, on a regular basis, for leakage. It will be necessary to
add a gauge to monitor the system holding charge pressure. If a drop in pressure occurs, the source of
leakage must be found and corrected. The system must be evacuated and recharged with dry nitrogen to
maintain the package integrity.
*
Motors – (NOTE: The following are general recommendations. Consult the manufacturer of your motor
for specific recommendations.)
1) Remove the condensation drain plugs from those units equipped with them and insert silica-gel into the
openings. Insert one-half pound bags of silica-gel (or other desiccant material) into the air inlets and outlets
of drip-proof type motors.
NOTE:
The bags must remain visible, and tagged, so they will be noticed and removed when
the unit is prepared for service.
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Long Term Storage Requirements
2) Cover the unit completely to exclude dirt, dust, moisture, and other foreign materials.
3) If the motor can be moved, it is suggested that the entire motor be encased in a strong, transparent plastic
bag. Before sealing this bag, a moisture indicator should be attached to the side of the motor and several
bags of silica-gel desiccant put inside the bag, around the motor. When the moisture indicator shows
that the desiccant has lost its effectiveness, as by a change in color, the bag should be opened and fresh
replacement desiccants installed.
Whenever the motor cannot be sealed, space heaters must be installed to keep the motor at least 10°F
above the ambient temperature.
NOTE:
There is a potential for damage by small rodents and other animals that will inhabit
motors in search of warm surroundings or food. Due to this, a possibility of motor
winding destruction exists. Sealing motor openings should restrict access to the
motor.
4) Rotate motor and compressor shafts several revolutions (approximately 6) per month to eliminate flat spots
on the bearing surfaces. If the compressor unit is installed, wired and charged with oil, open all oil line valves
and run the oil pump for 10 seconds prior to rotating the compressor shaft. Continue running the oil pump
while the compressor shaft is being turned to help lubricate the surfaces of the shaft seal.
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Description
COMPRESSOR
The Vilter Single Screw Compressor is a positive displacement, capacity and volume controlled, oil flooded,
rotary compressor which uses a single main screw intermeshed by two opposing gate rotors. Gas compression
occurs when the individual fingers of each gate rotor sweep through the grooves, or flutes, of the main screw as
the screw rotates. Compression occurs from the time the screw flute is first closed off by the gate rotor finger,
until the time when the screw flute has rotated to the point of lining up with the discharge port in the compressor housing. A labyrinth type seal is used to prevent gas at discharge pressure from leaking past the end of the
screw. Any discharge gas leakage past the labyrinth seal is vented back to suction via four longitudinal holes
drilled through the body of the screw.
By venting the discharge end of the main screw back to suction, forces on each end of the screw are equal. This
results in zero net axial forces on the main bearings. With twin opposing gate rotors, all radial forces are cancelled out also. Main shaft bearings have no net forces except the weight of the screw and the shaft assembly.
The compressors are comprised of three rotating assemblies: the main screw assembly and the two gate rotor assemblies. Each of these rotating assemblies use a common bearing configuration consisting of a single,
cylindrical rolling element bearing at one end, and a pair of angular contact ball bearings at the other end. The
pair of angular contact ball bearings are used to axially fix one end of the rotating shafts, and to absorb the small
amount of thrust loads on the shafts. The inner races of the ball bearings are securely clamped to the rotating
shafts, while the outer races are securely held in the bearing housing, thus fixing the axial position of the shaft
in relation to the bearing housings. The cylindrical roller bearings at the opposite end of the shafts allow for
axial growth of the shafts while supporting the radial loads from the shafts.
The suction gas enters the compressor housing through the top inlet flange, at the driven end of the unit. The
driven end of the compressor housing is flooded with gas at suction pressure. The gas enters the open end of
the main screw flutes at the driven end, and becomes trapped in the screw flute as the screw rotates and the
gate rotor tooth enters the end of the flute. At this point, the compression process begins. Directly after the
screw flute is closed off by the gate rotor tooth, oil is injected into the groove.
The oil enters the compressor through a connection at the top of the compressor. The purpose of the injected oil
is to absorb the heat of compression, to seal the gate rotor tooth in the groove, and to lubricate the moving parts.
Additional internal oiling ports are provided at the main and gate rotor bearings to cool and lubricate the bearings. The mechanical shaft seal housing also contains oiling ports to lubricate, cool and provide a sealing film
of oil for the mechanical shafts seal. Excess oil flows through the check valves on the sealing baffle plate. This
oil is directed at the main rotor roller bearing, which cools and lubricates the front roller bearing.
As the main screw rotates, the gate rotor is also driven, causing the gate rotor tooth to sweep the groove in the
main screw. This sweeping action reduces the volume of the groove ahead of the gate rotor tooth and causes
the trapped gas and oil to be compressed in the reduced volume. As the main screw continues to rotate, the
gate rotor tooth continues to reduce the groove volume to a minimum, thus compressing the trapped gas to
a maximum pressure. A labyrinth seal arrangement prevents the compressed gas from leaking past the end of
the screw. As the gate rotor tooth reaches the end of the groove, the groove rotates to a position that lines up
with the discharge port in the compressor housing and the gas/oil mixture is discharged from the screw at high
pressure. This completes the compression cycle for a single flute of the main screw.
Once the gas is swept from the main screw flute through the discharge port, it passes into the discharge manifold
of the compressor. From the discharge manifold, the gas/oil exits the compressor housing
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Description
The Vilter compressors feature the exclusive Parallex™ Slide System, which consists of a pair of slides for each
gate rotor assembly. These two independently operated slides are referred to as the capacity slide and the volume ratio slide. On the suction end of the screw, the capacity slide moves to vary the timing of the beginning
of the compression process. With the slide moved all the way out to the suction end of the screw (the 100%
position), the compression process begins immediately after the gate rotor tooth enters the screw flute and
closes off the end of the groove. In this situation, the maximum volume of gas is trapped in the screw flute at
the start of the compression process. As the slide is pulled back away from the suction end of the screw, the
start of the compression process is delayed as some of the suction gas is allowed to spill back out of the screw
flute until the screw rotates far enough to pass the end of the capacity slide and begin compressing. This causes
a reduced volume of gas to be trapped in the screw flute when the compression process begins. In this way, the
capacity of the compressor is reduced from 100% down to as low as 10% of the full rated capacity.
The capacity slide provides the means for controlling specific process set points. By continuously adjusting the
flow of gas through the compressor, either suction or discharge pressure in a particular process can be controlled.
When coupled with a microprocessor controller, the adjustable capacity slide allows for precise and continuous
automatic control of any parameter in the process to a chosen set point.
The second slide for each gate rotor is the volume ratio slide. The purpose of the volume ratio slide is to maximize
the efficiency of the compressor by matching the gas pressure within the screw flute at the point of discharge
to the downstream process requirements. The volume ratio slide operates at the discharge end of the screw,
and acts to vary the position of the discharge port. When the slide is extended fully to the discharge end of the
screw (the 100% position), the compression process within the screw flute continues until the screw rotates
far enough for the flute to pass the end of the volume ratio slide. At this point, the screw flute lines up with the
discharge port and the compressed gas is expelled from the screw flute. As the volume ratio slide is pulled back
away from the discharge end of the screw, the position of the discharge port is changed and the gas is allowed
to escape the screw flute earlier in the compression process, at a reduced pressure.
The overall volume ratio within the compressor is determined by the distance between the front of the capacity slide (the start of compression) and the back of the volume ratio slide (the completion of compression).
Therefore, the volume ratio slide must respond to changes in the downstream pressure measured in the oil
separator and position itself for the required compression ratio based on the position of the capacity slide. By
only compressing the gas within the screw as far as required to match the pressure in the downstream receiver,
the compressor efficiency is maximized. Proper positioning of the volume ratio slide prevents either over
compressing or under compressing of the gas within the screw flute. This allows the single screw compressor
to efficiently handle a range of volume ratios from as low as 1.2 up to 7.0.
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Foundation
• The foundation must adequately support the weight of the compressor package, including vessels, oil coolers,
controllers, and all ancillary equipment. (See documentation for weight and dimension specifications
• A detailed general arrangement drawing is provided with all packages. This drawing details foundation type,
mounting foot locations, grouting, and anchoring methods for the specific package.
• Vilter Mfg. recommends consulting a licensed architect to design a suitable foundation for the application.
• Foundations must be built of industrial-grade materials and conform to the appropriate building codes.
• Mount the unit in a location which allows adequate clearance around the unit for maintenance.
• The unit may be top-heavy so caution should be taken when lifting and moving the unit; See the “Rigging and
Lifting” documentation provided with the unit.
• The unit must be securely bolted to the foundation and shims should be used to level the unit for proper operation. Grouting must be used.
• The compressor should be firmly mounted to the package; isolation dampers should not be used between the
compressor and the package frame.
• Pipes and conduits are strictly “no step” areas and could be damaged if used as foot or handholds.
• Adequately support pipes, conduits, etc. to prevent both transmission of vibration and failure due to stress at
the flanges. Suction and discharge lines must be supported with appropriate pipe hangers to prevent their
movement if they are disconnected from the compressor package. (See Table 1 below for Unit Weights.)
• In high-pressure screw compressor applications, package vibration and noise levels may be higher than those
found in standard refrigeration applications. In these cases, adequate foundation and proper installation are
vital to ensure trouble-free operation. Additional sound attenuation measures may also be needed.
TABLE 1. UNIT WEIGHTS
MODEL
VSG 301
VSG 361
VSG 401
VSG 501
VSG 601
VSG 701
VSSG 291
VSSG 341
VSSG 451
VSSG 601
VSG 751
VSG 901
VSG 1051
VSG 1201
VSG 1551
VSG 1851
VSG 2101
STANDARD
UNIT (LBS)*
2,650
2,750
2,850
4,000
4,500
5,000
4,300
4,400
4,500
4,600
5,300
5,400
6,600
6,700
10,000
10,100
10,200
* Does not include motor.
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Rigging and Lifting
Thank you for purchasing a gas compressor (the “Compressor”) from Vilter Manufacturing LLC (“Vilter”). Rigging
and Lifting a large piece of equipment like the Compressor is extremely dangerous.
**DISCLAIMER**
Notice
This rigging and lifting manual (this “Manual”) is provided to you as a courtesy by Vilter and is not intended to be a
comprehensive guide to rigging and lifting the Compressor. Vilter shall not be liable for errors contained herein or
for incidental or consequential damages (including any injury to persons performing the rigging or lifting) in connection with the furnishing, performance, or use of this Manual. This Manual is only a set of suggestions and you
may not rely solely on the information contained in this Manual to conduct the lift. In addition, information in this
Manual is subject to change without notice.
Limited Warranty
The information is this Manual does not constitute any warranty as to the Compressor. The warranty provision
contained in the terms and conditions pursuant to which the Compressor was sold serves as the sole and exclusive
warranty.
Safety
To correctly and safely operate the Compressor, you must consult all of the documentation that was provided to
you with the purchase of the Compressor (including all information sheets, warning notices and any other documents). This Manual is not intended to summarize or supplant any directions regarding how to safely operate or
move the Compressor.
BEFORE LIFTING AND RIGGING THE COMPRESSOR
In order to minimize the inherent risk involved in rigging and lifting a large piece of equipment, before attempting
to lift the Compressor, the actions of all parties involved in the lift must be carefully planned.
The following is provided merely to encourage purchasers to think about all of the steps necessary to rig and lift
the Compressor. Vilter can neither anticipate all of the dangers involved in a particular lift, nor evaluate the particular capabilities of each of person who will participate in the lift.
Educate and Select Lift Participants
To rig and lift the Compressor in a safe manner, you will need to select experienced, trained people (“Participants”)
to take on (and successfully perform) at a minimum the tasks associated with each of the following positions:
•
•
•
•
•
•
•
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Crane Operator;
Crane Owner;
Lift Coordinator;
Lift Engineer;
Rigging Specialist;
Riggers; and
Safety Signaler.
Rigging and Lifting
Training curriculum for Participants, at a minimum, should include:
•
•
•
•
•
•
A review of safe operating practices;
A review of who each person is and their specific role in the lift;
A tutorial on how to read lift charts;
A demonstration on how to use and inspect rigging hardware;
A review of the company’s general lift plans and procedures;
A tutorial on hand signals normally used to communicate with crane operators (a copy of such hand signals
may be obtained from machine safety vendors); and
• A review of the Compressor’s specific rig and lift plan (the “Plan”) (developed by the Lift Coordinator and Lift
Engineer); please see the section immediately below entitled “Create and Communicate the Plan.”
Individuals participating in the lift should fully understand the scientific principles pursuant to which a successful
lift is dependent—for example, center of gravity, equilibrium, and mechanics of load stabilization, critical angle
considerations and force.
All Participants should undergo a fitness-for-duty program, including drug testing and medical examinations.
Create and Communicate the Plan
Well in advance of the planned lift date, lift planning meetings and hazard assessment meetings should be held
with all Participants in attendance. In addition, the Plan should be finalized and distributed for review and comment.
The Plan should clearly define requirements, expectations and specifications for lifting the Compressor. At a minimum, the Plan should include:
• Standard lifting and rigging procedures in place at the lift site (including proper classification of the lift as a
“critical lift” a “serious lift” or a “standard lift”);
• Drawings of the Compressor;
• A description of the lifting task;
• An evaluation of the hazards;
• The rigging plan and sketches of rigging to be attached to the Compressor;
• The roles and responsibilities of all Participants;
• An emergency plan; and
• The contact information of the Plan preparer
It is important to confirm that each Participant understands both the broader Plan and their specific responsibilities
during the lift. Participants should be encouraged to contact the Plan preparer at any time if they have questions.
In addition, the Plan preparer should be on-site during the lift to ensure that the lift is being executed in accordance with the Plan. Finally, well in advance of the lift date, it should be confirmed that all necessary permits have
been obtained.
Inspect and Use the Appropriate Lifting Equipment
Verify Crane Operator and Crane Owner Credentials
Prior to rigging and lifting the Compressor, certain precautions should be taken with regards to the crane, the
crane operator and the crane owner.
• The lift capacity of the crane must exceed the Compressor’s weight;
• Confirm that the crane operator is qualified to work on the site;
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Rigging and Lifting
• Get third-party confirmation that the crane owner and the crane operator are in compliance with applicable
laws, regulations and internal safety standards;
• Consult with the crane owner to determine if any site preparation is required for outriggers—improper use of
outriggers is a significant cause of crane failure;
• Determine the level of supervision to be supplied by the crane owner; and
• Review all crane maintenance and inspection records, including without limitation, the crane log book, maintenance records, inspection reports and the physical condition of the crane.
Take all Appropriate Measurements
• Understand and interpret the load charts;
• Review all Compressor drawings for unit size, weight, center of gravity and other specifications;
• Communicate incident response procedures in writing prior to the lift and verbally immediately before the lift;
• Determine the initial position, final position, orientation and elevation of the Compressor;
• Ensure that adequate space is provided to safely assemble, erect, and operate the crane and materials (such as
timber mats, cribbing and blocks);
• Identify and communicate to all Participants the access points, lift radius, swing radius, clearances, and obstructions;
• Eliminate hazards and obstructions that may interfere with moving the Compressor; and
• Inform all Participants of water lines, sewer lines, power lines and other obstructions.
Use Proper Rigging Methods
• Determine diameter, length and quantity of necessary rigging hardware (design and detail the rigging hardware to suit lifting the Compressor at the supplied pad eyes);
• Review and inspect all hoisting, lifting and rigging equipment;
• Select shackle size and prepare sketches or drawings for rigging;
• Use proper, conservative rigging techniques—including spreader beams—needed to lift the Compressor;
• Pad sharp corners, check the orientation of chocker hitches and the orientation of hooks;
• Prevent the binding of hoist rings; and
• Verify pad eye information.
TEST AND BALANCE THE COMPRESSOR
It is essential to test and balance the compressor before executing the actual lift in order to identify potential
causes of injury to Participants and the Compressor.
Secure Rigging and the Lift Site
• Reiterate that no one should walk under the raised load;
• Secure and restrict access to the lift area (consider vacating all non-essential personnel from the area);
• Provide qualified supervision for the duration of the lift;
• If applicable, assess the weather conditions and decide if it is safe to proceed;
• Stop the lift when any potentially unsafe conditions are recognized; and
• Ensure there are open channels for communications during the pre-lift, lift and post-lift phases (radio communications should be used if a direct line of sight is not possible).
Test and Balance the Compressor before the Lift
• Slowly raise the crane to take slack out of the rigging without actually lifting the load;
• Allow the rigging gear to settle into place;
• Check for twists and binds;
• Verify that all padding has remained in place and that all slings are protected from sharp edges;
• Begin to raise the load to verify balance and check the braking system; and
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Rigging and Lifting
• If the Compressor is not balanced, lower and adjust as necessary.
CONTACT VILTER
While Vilter will not offer any specific feedback on the Plan or provide a specific Plan for rigging and lifting the
Compressor, Vilter may be able to answer questions about the Compressor that are important in developing your
Plan.
Please contact Vilter at:
P.O. Box 8904
5555 S Packard Ave
Cudahy, WI 53110-8904
Telephone: 1-414-744-0111
Fax: 1-414-744-3483
email: info.vilter@emerson.com
www.vilter.com
15
Installation
DELIVERY INSPECTION
Vilter screw compressor components are thoroughly
inspected at the factory. However, damage can occur
in shipment. For this reason, the units should be thoroughly inspected upon arrival. Any damage noted
should be reported immediately to the transportation
company. This way, an authorized agent can examine
the unit, determine the extent of damage and take
necessary steps to rectify the claim with no serious
or costly delays. At the same time, the local Vilter
representative or the home office should be notified
of any claim made.
ELECTRICAL CONNECTIONS
See the Compact Logix PLC manual. (p/n 35391CL)
TESTING SYSTEM FOR LEAKS
Vilter equipment is tested for leaks at the factory.
One the most important steps in putting a system
into operation is field testing for leaks. This must
be done to assure a tight system. To test leaks, the
system pressure must be built up. Before testing may
proceed, several things must be done.
LOCATING UNIT - DRIVE COUPLING ALIGNMENT
The single screw compressor units are shipped with
all major components mounted on structural steel.
Place the entire unit on the floor on a concrete pad and
securely bolt in place. Grouting is required. Review
local codes and ASHRAE Safety Code for Mechanical.
Bolt holes are located in the unit’s mounting feet.
When locating the unit, provide adequate space for
service work. When the compressor unit is in place
on the concrete pad, check both lengthwise and
crosswise to assure it is level. Use shims and wedges
as needed under the mounting feet to adjust the level
of the unit.
First, if test pressures exceed the settings of the system, relief valves or safety devices, they must be removed and the connection plugged during the test.
Secondly, all valves should be opened except those
leading to the atmosphere. Then, open all solenoids
and pressure regulators by the manual lifting stems.
All bypass arrangements must also be opened.
NOTE:
Do not hydro-test the SS unit. This can cause damage to the the filter elements.
UNIT OIL CHARGING
On single screw units, the motor and compressor have
been roughly aligned at the factory. The coupling
center section was shipped loose to allow a check of
proper electrical phasing, direction of rotation of the
motor and final coupling alignment. The dial indicator
alignment method is recommended. Final alignment
should be within 0.002 inches total indicator reading
in all directions for both the VSG and VSSG models.
SYSTEM PIPING
Hangers and supports for the Suction, Discharge,
Oil Lines & Water Lines, should receive careful attention. The Hangers or Supports “MUST” have ample
strength and be securely anchored to handle the full
support of the piping connecting to the Vilter Single
Screw Unit. The piping support should be designed
so that the weight of any interconnecting piping is
not put onto the Compressor Unit.
16
The compressor unit is shipped from Vilter with no
oil charge. The initial oil charge can be made through
the drain valve at the oil separator. Vilter motor
driven and manually operated oil chargers are available for this purpose.
The normal operating level is the middle of the UPPER sight glass on the oil separator. See Table 2 for
approximate separator oil charge requirements.
Installation
TABLE 2. OIL CHARGE
Oil Sep Size
16”
20”
20”
30”
20”
24”
30”
36”
42”
Approximate Oil
Charge – Gal.
20 to 27
22 to 31
20 to 25
30 to 35
30 to 40
40 to 50
60 to 75
95 to 105
145 to 165
The oil level may be above the top sight glass at this
time. Electrically forcing on the oil pump will aid in
pre-lubing the various oil lines,oil filter, and other
items in the oil circuit before starting the unit. Add
oil as required to bring the level back up the middle
of UPPER sight glass before stating the unit. Do not
mix oils.
Oil For Single Screw Compressors
Due to the need for adequate lubrication, Vilter recommends only the use of Vilter lubricants, designed
specifically for Vilter compressors. With the extensive
research that has been performed, we are able to
offer gas compression lubricating oils. Use of oil not
specified or supplied by Vilter will void the compressor warranty.
Please contact your local Vilter representative or the
Home Office for further information.
17
Installation
NOTE: If the hub position on the shaft does not allow
enough room to install the short bolts in the hub
after hub mounting, install the bolts and disc pack
before mounting hub on shaft.
B. Straight Bore:
1. Install key(s) in the shaft. If the hub is an interference fit, heat the hub in an oil bath or oven until
bore is sufficiently larger than the shaft. 350º F.
is usually sufficient. An open flame is not recommended. However, if flame heating is necessary,
use a very large rose bud tip to give even heat
distribution. A thermal heat stick will help determine hub temperature. DO NOT SPOT HEAT THE
HUB OR DISTORTION MAY OCCUR. With the hubs
expanded, slide it up the shaft to the desired axial
position. A pre-set axial stop device can be helpful.
COUPLING INFORMATION
All other coupling information can be found in the
vendor section of this manual.
COUPLINGS INSTALLATION AND ALIGNMENT
These instructions are intended to help you to install
and align the coupling. Covered here will be general
information, hub mounting, alignment, assembly,
locknut torquing, discpack replacement, and part
numbers. The coupling as received, may or may not
be assembled.
*If assembled, the locknuts are not torqued.
*If coupling is assembled, remove the bolts that attach the hubs to the disc packs. Remove both hubs.
Leave the disc packs attached to the center member.
A. Hub Mounting:
1. Clean hub bores and shafts. Remove any nicks or
burrs. If bore is tapered, check for good contact
pattern. If the bore is straight, measure the bore
and shaft diameters to assure proper fit. The key(s)
should have a snug side-to-side fit with a small
clearance over the top.
18
C. Taper Bore:
1. Put the hub on the shaft without key(s) in place.
Lightly tap hub up the shaft with a soft hammer.
This will assure a metal-to-metal fit between shaft
and hub. This is the starting point for the axial
draw. Record this position between shaft and hub
face with a depth micrometer. Mount a dial indicator to read axial hub movement. Set the indicator
to “0”. Remove hub and install key(s). Remount
hub, drawing it up the shaft to the “0” set point.
Continue to advance hub up the taper to the desired axial position. Use the indicator as a guide
only. A pre-set axial stop device can be helpful.
Check the final results with a depth micrometer.
The hub may have to be heated in order to reach
the desired position on the shaft. DO NOT SPOT
HEAT THE HUB OR DISTORTION MAY OCCUR.
Install shaft locknut to hold hub in place.
D. Shaft Alignment.
Move equipment into place.
1. Soft Foot. The equipment must sit flat on its
base (+/- 0.002 inches). Any soft foot must be
corrected now.
2. Axial Spacing. The axial spacing of the shafts
should be positioned so that the disc packs
(flexing elements) are flat when the equipment
is running under normal operating conditions.
Installation
This means there is a minimal amount of waviness
in the disc pack when viewed from the side. This
will result in a flexing element that is centered and
parallel to its mating flange faces. Move the connected equipment to accomplish the above.
Note: Alignment of C-Flange Units should be checked
when compressor or motor are replaced.
NOTE: The disc pack is designed to an optimal thickness and is not to be used for axial adjustments.
See documentation that came with the coupling for
complete specifications.
3. Angular Alignment. Rigidly mount a dial indicator
on one hub or shaft, reading the face of the other
hub flange, as shown on next page. Rotate both
shafts together, making sure the shaft axial spacing
remains constant. Adjust the equipment by shimming and/or moving so that the indicator reading
is within .002 inch per inch of coupling flange.
4. Parallel Offset. Rigidly mount a dial indicator on
one hub or shaft, reading the other hub flange outside diameter, as shown in Figure 3. Indicator set-up
sag must be compensated for. Rotate both shafts
together. Adjust the equipment by shimming and/
or moving so that the indicator reading is within
.002 inch per inch of the axial length between flex
elements. See drawing below.
Note: If the driver or driven equipment alignment
specification is tighter than these recommendations,
the specification should be used. Also, be sure to
compensate for thermal movement in the equipment.
The coupling is capable of approximately four time
the above shaft alignment tolerances. However, close
alignment at installation will provide longer service
with smoother operation.
E. Final assembly
With the coupling in good alignment the bolts will fit
through the holes in the flanges and the disc packs
more easily.
1. If the coupling arrived assembled, the disc
packs are still attached to the center ring. Before
taking the discs packs off, first install one hub bolt
through each disc pack and secure with lock out.
This will help when the pack is reinstalled late. If
the coupling was shipped disassembled, the bolt
through the pack is not required as the discs in the
pack are factory taped together.
2. Remove the long bolts. Mount the disc packs
on the hubs with one bolt through the disc pack
aligned with a clearance hole in the hub. Install
the short bolts through the hub, disc pack, bevel
washer or link, and secure with a lockout.
3. Remove the long bolts. Mount the disc packs
on the hubs with one bolt through the disc pack
aligned with a clearance hole in the hub. Install
the short bolts through the hub, disc pack, bevel
washer or link, and secure with a lockout.
NOTE: All bolt threads should be lubricated. A clean
motor oil is recommended. On size 226 and larger, a
link must be put on bolt first. Remove the disc pack
alignment bolt. Proceed to mount the second disc
pack to the other hub in the same way.
4. Position one set of short bolts in each hub on
top. Now slide the center ring down into place
straddling the short bolts with the center ring
bushings. If coupling is dynamically balanced, the
center ring match marks must lineup with both
hub match marks. When one bushing is in-line
19
Installation
with the hole in the disc pack, slide one long bolt
through washer or link, disc pack, center ring, disc
pack, washer or link, and then secure with a locknut. The long bolt requires a minimum clearance
“R” for installation between back side of coupling
flange and stationary equipment. See Figure 1
and Table l for value of “R.” On size 226 and larger
a link must be put on the bolt first. Now install the
rest of the long bolts in the same manner.
5. Torque the long bolt locknuts at this time.
NOTE: With the coupling in good alignment, the bolts
will fit through the holes in the flanges and the disc
pack more easily. It is recommended that all locknuts
be retightened after several hours of initial operation.
E. For further help with the installation or alignment,
consult Rexnord.
F. Disc Pack Replacement.
If it becomes necessary to replace the disc pack, it can
be done as follows:
1. Remove all the long bolts and lower the center
ring by sliding it our from between the two disc
packs.
2. Remove one short bolt from the disc pack/hub
connection and reinstall it through a hub clearance
hole and into the hole in the disc pack. Put the nut
on. This will keep the discs together and maintains
the disc orientation for later reinstallation. Remove
the rest of the short bolts and takeoff the disc pack.
Repeat for the second disc pack.
3. Replace the pack(s) if required. Recheck alignment per Section D. Reassemble per Section E.
20
Installation & Calibration Slide Valve Actuators
Slide Valve Actuator Installations Instructions
3.
Caution
WHEN INSTALLING THE OPTICAL SLIDE MOTOR,
LOOSEN LOCKING COLLAR BEFORE SLIDING THE
COLLAR DOWN ON THE SHAFT. DO NOT USE A
SCREWDRIVER TO PRY LOCKING COLLAR INTO
POSITION.
OVERVIEW
Calibration of an optical slide valve actuator is a two
step process that must be done for each actuator
installed of the compressor. Briefly, the steps are as
follows.
1) The actuator motor control module, located
inside the actuator housing, is calibrated so
that it knows the minimum and maximum rotational positions of the slide valve it controls.
The calibrated actuator will output 0 VDC at the
minimum position and 5 VDC at the maximum
position.
2) After the actuator motor control module has been
calibrated for 0-5Volts, the controlling channel
corresponding to the actuator motor (either the
capacity or volume) has to be calibrated. This
instructs the control panel to learn the rotational
0% position & rotational 100% position of the slide
valve travel.
PLEASE NOTE:
Because there is an optical sensor on this motor, do
not attempt calibration in direct sunlight.
ACTUATOR MOTOR CONTROL
MODULE CALIBRATION PROCEDURE
1.
Disable the Slide Non-Movement Alarm by
going to the “Setup” menu on the control
panel and choosing “Alarm Disable” for the
Slide Non-Movement Option. (If applicable).
2.
Completely shut off the power to the control
panel completely.
If not already done, mount the slide valve
actuator per (“Vilter Actuator set up for
Capacity and Volume Slide Motors). Next,
wire the actuator per the attached wiring
diagrams, using the already installed electrical conduit to run the cables. The old wiring
can be used to pull the new cables through
the conduit to the control panel. The cables
may also be externally tie-wrapped to the
conduit. Run the yellow AC power cable(s)
and the gray DC position transmitter
cable(s) in different conduit. This prevents
the DC position transmitter cable from picking up electrical noise from the AC power
cable. Do not connect either of the cables
to the actuators yet.
In addition, if the actuators are replacing old gearmotors on early units, you must remove the capacitors and associated wiring from inside the control
panel. This is necessary to prevent electrical damage
to the new actuator motor.
4.
When completing the calibration of the
new actuators, the motors are signaled to
move to below 5%. This may not completely
occur when exiting the calibration screen
due to a “program timer”. HOWEVER,
when the compressor actually starts, the
motors will travel below 5% and function
correctly. The user may see that the actuators are not below 5% after calibration and
try to find the reason. If the calibration
screen is re-entered right away and then
exited, the timer will allow the actuator to
go below the 5% on the screen. This may be
perceived as a problem; in reality,it is not.
5. Note:The 0 to 5V-position transmitter
output of the actuator will fluctuate wildly
during the calibration process. To prevent
damage to the actuators, do not connect the
yellow power cable or the gray position
transmitter cable until instructed to do so
later on.
6. Open the plastic cover of the capacity motor by
removing the four #10 screws.
21
Installation & Calibration Slide Valve Actuators
Caution: there are wires attached to the connector on the plastic cover. Handling the
cover too aggressively could break the wires.
7. Gently lift the cover and tilt it toward the Turck
connectors. Raise the cover enough to be able
to press the blue calibrate button and be able
to see the red LED on the top of assembly.
8. Press “Menu” on the main screen and then press
the “Slide Calibration” button, to enter the slide
calibration screen. (Note: you must be in this slide
calibration screen before attaching the yellow
power cable or gray position transmitter cable.)
9. Now connect the yellow power cable and the
gray position transmitter cable to the actuator.
10. Press INC and DEC to move the slide valve and check
for the correct rotation. See Table 1on page 48 for
Actuator/command shaft rotation specifications.
11. Note: If the increase and decrease buttons do
not correspond to increase or decrease shaft
rotation, swap the blue and brown wires of
the “yellow power cable”. This will reverse
the rotation of the actuator/command shaft.
12. Quickly press and release the blue push button on the actuator one time. This places the actuator in calibration mode. The
r e d L E D w i l l b e g i n f l a s h i n g r a p i d l y.
13. Note: When the actuator is in calibration mode, it outputs 0V when the actuator is running
and 5V when it is still. Thus, as stated earlier, the
actuator voltage will fluctuate during calibration. After the actuator has been calibrated,
0V output will correspond to the minimum
position and 5V to the maximum position.
14. Note: The “Slide calibration” screen on the control panel has a “Current” window, which displays
twice the actuator output voltage. This value,
(the % volume and the % capacity) displayed in
the “Current Vol” and Current Cap” Windows are
meaningless until calibration has been completed.
22
15. Use the DEC button on the control panel to
drive the slide valve to its minimum “mechanical stop” position. Do not continue to run the
actuator in this direction after the slide valve
has reached the stop. Doing so may cause damage to the actuator or the slide valve. When
the slide has reached the mechanical stop position, use the INC button to pulse the actuator
to where the slide is just off of the mechanical
stop and there is no tension on the motor shaft.
16. Quickly press and release the blue button on
the actuator again. The red LED will now flash
at a slower rate, indication that the minimum
slide valve position (0V position) has been set.
17. Use the INC button on the control panel to drive
the slide to its maximum “mechanical stop” position. Do not continue to run the actuator in this
direction after the slide valve has reached the
stop. Doing so may cause damage to the actuator or the slide valve. When the slide valve has
reached the mechanical stop position, use the
DEC button to pulse the actuator to where the
slide is just off of its mechanical stop and there
is no tension on the motor shaft.
18. Quickly press and release the blue button on the
actuator one more time. The red LED will stop
flashing. The actuator is now calibrated and knows
the minimum and maximum positions of the slide
valve it controls. Now the capacity or volume
channel of the control panel can be calibrated.
19. Use the Dec button to move the actuator towards
its minimum position while watching the millivolt readout on the control panel screen. Discontinue pressing the DEC button when the millivolt
reading in the “Current” window above the “Set
Min” button is approximately 500 millivolts.
20. Now use the DEC and INC buttons to position the
slide valve until a value close to 300 millivolts is on
the screen. Then, press the “Set Min” button for
the capacity or volume slide valve window to tell
the controller that this is the minimum millivolt
position. Note: The value in the “Current Cap” or
“Current Vol” window has no meaning right now.
Installation & Calibration Slide Valve Actuators
21. Use the INC button to rotate the actuator towards its maximum position while watching
the millivolt readout on the controller screen.
Discontinue pressing the INC button when
the millivolt reading in the “Current” window
is approximately 9200 millivolts (7900 millivolts for the 2783J qualified analog boards).
You are nearing the mechanical stop position.
22. Pulse the INC button to carefully move the slide
valve until the millivolt readout “saturates”, or
stops increasing. This is around 9500 millivolts
(8400 millivolts for 2783 qualified analog boards).
23. Pulse the DEC button until the millivolts just
start to decrease. (This is the point where
the channel drops out of saturation).Adjust millivolt value to 300 millivolts below
recorded maximum millivolts in step #22.
24. Press the “Set Max” button.
25. Press the “Main” button to complete calibration and exit the “Slide Calibration” screen.
The controller will automatically energize
the actuator and drive it back to its minimum position (below 5%) for pre-start-up.
26. Note: Now the “Current Cap” or the “Current
Vol” value will be displayed in the window on the
“Main” screen and the “Slide Calibration” screen.
27. Gently lower the plastic cover over the top
of the actuator to where it contacts the base
and o-ring seal. After making sure the cover
is seated properly, gently tighten the four
#10 screws. Caution: The plastic cover
will crack if the screws are over tightened.
28. Enable the “Slide Non-Movement Alarm” by going to the “Setup” menu and choosing “Alarm
Enable” for the “Slide Non-Movement Option”.
29. This completes the calibration for this channel either capacity or volume. Repeat the
same procedure to the other channel.
23
Slide Valve Operation
Slide Valve Actuator Operation
The slide valve actuator is a gear-motor with a position sensor. The motor is powered in the forward
and reverse directions from the main computer in
the control panel. The position sensor tells the main
computer the position of the slide valve. The main
computer uses the position and process information
to decide where to move the slide valve next.
The position sensors works by optically counting motor turns. On the shaft of the motor is a small aluminum “photochopper”. It has a 180 degree fence that
passes through the slots of two slotted optocouplers.
The optocouplers have an infrared light emitting diode (LED) on one side of the slot and a phototransistor
on the other. The phototransistor behaves as a light
controlled switch. When the photochopper fence
is blocking the slot, light from the LED is prevented
from reaching the phototransistor and the switch is
open. When photochopper fence is not blocking the
slot, the switch is closed.
As the motor turns, the photochopper fence alternately blocks and opens the optocoupler slots,
generating a sequence that the position sensor microcontroller can use to determine motor position by
counting. Because the motor is connected to the slide
valve by gears, knowing the motor position means
knowing the slide valve position.
During calibration, the position sensor records the
high and low count of motor turns. The operator tells
the position sensor when the actuator is at the high
or low position with the push button. Refer to the
calibration instructions for the detailed calibration
procedure.
The position sensor can get “lost” if the motor is
moved while the position sensor is not powered. To
prevent this, the motor can only be moved electrically
while the position sensor is powered. When the position sensor loses power, power is cut to the motor. A
capacitor stores enough energy to keep the position
sensor circuitry alive long enough for the motor to
come to a complete stop and then save the motor
position to non-volatile EEPROM memory. When
power is restored, the saved motor position is read
from EEPROM memory and the actuators resumes
normal function
24
This scheme is not foolproof. If the motor is moved
manually while the power is off or the motor brake
has failed, allowing the motor to free wheel for too
long after the position sensor looses power, the actuator will become lost.
A brake failure can sometimes be detected by the
position sensor. If the motor never stops turning after
a power loss, the position sensor detects this, knows
it will be lost, and goes immediately into calibrate
mode when power is restored.
Slide Valve Actuator Trouble Shooting Guide
Problem
The actuator cannot be calibrated
Reason
Dirt or debris is blocking one or
both optocoupler slots
Clean the optocoupler slots
with a Q-Tip and rubbing alcohol.
The photochopper fence extends
less than about half way into the
optocoupler slots
Adjust the photochopper so
that the fence extends further
into the optocoupler slots.
Make sure the motor brake
operates freely and the photochopper will not contact the
optocouplers when the shaft is
pressed down.
The white calibrate wire in the grey
Turck cable is grounded
Dirt and/or condensation on the
position sensor boards are causing
it to malfunction
The actuator goes into calibration mode spontaneously
Tape the end of the white wire
in the panel and make sure that
it cannot touch metal
Clean the boards with an electronics cleaner or compressed
air.
The calibrate button is stuck
down
Try to free the stuck button.
The position sensor has failed
Replace the actuator.
Push button is being held down for
more that ¾ second when going
through the calibration procedure
Depress the button quickly and
then let go. Each ¾ second the
button is held down counts as
another press.
The white calibrate wire in the grey
Turck cable is grounding intermittently
Tape the end of the white wire
in the panel and make sure that
it cannot touch metal.
A very strong source of electromagnetic interference (EMI), such as a
contactor, is in the vicinity of the
actuator or grey cable
Increase the distance between
the EMI source and the actuator.
There is an intermittent failure of
the position sensor
The actuator goes into calibration mode every time
power is restored after a
power loss
Solution
Install additional metal shielding material between the EMI
source and the actuator or
cable.
Replace the actuator.
The motor brake is not working properly (see theory section
above.)
Get the motor brake to where it
operates freely and recalibrate.
25
Slide Valve Actuator Trouble Shooting Guide
Problem
The actuator does not transmit the correct position after
a power loss
Reason
The motor was manually moved
while the position sensor was not
powered.
The motor brake is not working
properly
There is a rapid clicking noise
when the motor is operating
The motor operates in one
direction only
The motor will not move in
either direction
The motor runs intermittently,
several minutes on, several
minutes off
26
Solution
Recalibrate.
Get the motor brake to where it
operates freely and then recalibrate.
The position sensor’s EEPROM
memory has failed
Replace the actuator.
The photochopper is misaligned
with the slotted optocouplers
Try to realign or replace the actuator.
The photochopper is positioned
too low on the motor shaft.
Adjust the photochopper so that
the fence extends further into
the optocoupler slots.
A motor bearing has failed
Replace the actuator.
There is a loose connection in the
screw terminal blocks
Tighten.
There is a loose or dirty connection in the yellow Turck cable
Clean and tighten.
The position sensor has failed
Replace the actuator.
There is a broken motor lead or
winding
Replace the actuator.
The thermal switch has tripped
because the motor is overheated
The motor will resume operation when it cools. This could be
caused by a malfunctioning control panel. Consult the factory.
Any of the reasons listed in “The
motor operates in one direction
only”
See above.
The command shaft is jammed
Free the command shaft.
Broken gears in the gearmotor
Replace the actuator.
Motor is overheating and the
thermal switch is tripping
This could be caused by a malfunctioning control panel. Consult the factory.
Slide Valve Actuator Trouble Shooting Guide
Problem
Reason
The motor runs sporadically
The motor runs but output
shaft will not turn
Solution
Bad thermal switch
Replace the actuator.
Any of the reasons listed in “The
motor will not move in either direction”
See above.
Stripped gears inside the gear motor or the armature has come unpressed from the armature shaft
Replace the actuator.
Slide Valve Actuators communicate problems discovered by internal diagnostics via LED blink codes. Only one blink
code is displayed, even though it is possible that more than one problem has been detected.
Flash Pattern
Meaning
*=ON
_=OFF
*_*_*_*_*_*_*_*_*_*_*_
Calibration step 1
*___*___*___*___*___
Calibration step 2
*__*________________
This indicates a zero span. This error can only occur during calibration. The typical
cause is forgetting to move the actuator when setting the upper limit of the span.
If this is the case, press the blue button to restart the calibration procedure. This
error can also occur if either or both of the slotted optocouplers are not working. If
this is the case, the slide valve actuator will have to be replaced.
The operation of the slotted optocouplers is tested as follows:
1. Manually rotate the motor shaft until the aluminum photochopper fence is not
blocking either of the optocoupler slots.
2. Using a digital multi-meter, measure the DC voltage between terminal 3 of
the small terminal block and TP1 on the circuit board (see Note 1). You should
measure between 0.1 and 0.2 Volts.
3. Next, measure the DC voltage between terminal 3 and TP2 on the circuit
board. You should measure between 0.1 and 0.2 Volts.
27
Slide Valve Actuator Trouble Shooting Guide
*__________________
This indicates a skipped state in the patterns generated by the optocouplers as the
motor moves. This error means that the slide valve actuator is no longer transmitting accurate position information. The actuator should be recalibrated as soon as
possible. This code will not clear until the actuator is recalibrated.
This code can be caused by:
1. The motor speed exceeding the position sensors ability to measure it at some
time during operation. A non-functioning motor brake is usually to blame.
2. The actuator is being operated where strong infrared light can falsely trigger
the slotted optocouplers, such as direct sunlight. Shade the actuator when the
cover is off for service and calibration. Do not operate the actuator with the
cover off.
*__*__*____________
The motor has overheated. The actuator motor will not run until it cools. Once the
motor cools, the actuator will resume normal operation.
Motor overheating is sometimes a problem in hot and humid environments when
process conditions demand that the slide valve reposition often. Solutions are
available; consult your Vilter authorized distributor for details.
Another possible cause for this error is a stuck motor thermal switch. The thermal switch can be tested by measuring the DC voltage with a digital multi-meter
between the two TS1 wire pads (see Note 2). If the switch is closed (normal operation) you will measure 0 Volts.
********************
The 24V supply is voltage is low. This will occur momentarily when the actuator is
powered up and on power down.
If the problem persists, measure the voltage using a digital multi-meter between
terminals 3 and 4 of the small terminal block. If the voltage is >= 24V, replace the
actuator.
_*******************
The EEPROM data is bad. This is usually caused by loss of 24V power before the
calibration procedure was completed. The actuator will not move while this error
code is displayed. To clear the error, calibrate the actuator. If this error has occurred and the cause was not the loss of 24V power during calibration, possible
causes are:
1. The EEPROM memory in the micro-controller is bad.
2. The large blue capacitor is bad or has a cracked lead.
*****____*__________
Micro-controller program failure. Replace the actuator.
Note 1: TP1 and TP2 are plated-thru holes located close to the slotted optocouplers on the board. They are clearly
marked on the board silkscreen legend.
Note 2: The TS1 wire pads are where the motor thermal switch leads solder into the circuit board. They are clearly
marked on the board silkscreen legend and are oriented at a 45 degree angle.
28
Operation Section
Notice on using Non -Vilter Oils
Oil and its additives are crucial in system performance. Vilter Manufacturing will NOT APPROVE non-Vilter oils
for use with Vilter compressors. Due to the innumerable choices available it is not possible for us to test all oils
offered in the market place, and their effects on our equipment.
We realize that customers may choose lubricants other than Vilter branded oil. This is certainly within the
customers’ right as owners of the equipment. When this choice is made, however, Vilter is unable to accept
responsibility for any detrimental affects those lubricants may have on the equipment or system performance
and durability.
Should a lubrication related system issue occur with the use of non-Vilter oils, Vilter may deny warranty upon
evaluation of the issue. This includes any parts’ failure caused by inadequate lubrication.
Certainly, there are many good lubricants in the market place. The choice of a lubricant for a particular application involves consideration of many aspects of the lubricant and how it and its additive package will
react in the various parts of the entire system. It is a complex choice that depends on a combination of field
experience, lab and field-testing, and knowledge of lubricant chosen. Vilter will not accept those risks other
than for our own lubricants.
29
Operation
OIL SYSTEM
A. Oil Charge
Charge the oil separator with the proper quantity of
lubricating oil (see Table 2 in the Installation Section).
CAUTION
It is imperative you charge the oil into the receiver/
separator prior to energizing the control panel to
prevent burning out the immersion heater in the
separator/receiver.
During operation, maintain the separator oil level
in the normal operating range between the two
bullseye sight glasses. If the oil level is visible only
in the lowest sight glass, add oil to the operating
compressor through the connection located at the
compressor suction inlet. Pump oil into the compressor until the oil level in the separator is between the
two bullseye sight glasses. Watch this level carefully
to maintain proper operation. Never allow the oil to
reach a level higher than indicated on the highest
sight glass, since this may impair the operation and
efficiency of the oil separator portion of this combination vessel.
opening the bleed valves at the stop valve in the
block and bleed assembly, or at the bleed valve
for the oil filter housing.
Drain the filter housing in to an appropriate
container and dispose of the oil in a appropriate
manner following all Local, State and Federal
ordinances regarding the disposal of used oil.
Unscrew the bolts holding the cover flange to
the tank. Remove the cover flange and spring
plate. Pull out the filter element(s). Before
reassembling, thoroughly clean the tank and
spring plate to lengthen the life span of the filter
element(s).
B. Oil Filter
Change the oil filter after the first 200 hours of operation, as noted on the hour meter. Thereafter, replace
the filter every six months, or when the oil pressure
drop through the filter reaches 15 psi, whichever occurs first. The pressure drop across the filter is read
on the microprocessor panel. Check the pressure
drop and record it daily.
To prepare for the removal of the filter, shut down
the compressor. Isolate the filter housing appropriately. If unit is equipped with duplex filter housings
the unit does not have to be shut down, however
the filter to be serviced must be isolated before the
tank can be opened.
1. Filter Removal, VSG Units using Vilter Part
Number 1833G oil filter elements.
Release the pressure in the oil filter housing by
30
1833G
Filter
Element
FIGURE 3.
1833G FILTER ELEMENT TANKS
To replace the filter element(s), on single element tanks, insert the element and make sure
it fits onto the outlet connection. Install spring
plate, and bolt the cover assembly in place. On
units equipped with dual element tanks, insert
inner element and make sure it fits onto the
outlet connection. Put the centering piece on
the outer element and slide into tank making
sure the center piece fits into the inner element.
Put spring plate on outer element and bolt the
cover assembly in place.
Operation
CAUTION
When changing filter, discard clogged filter only.
Save and reuse spring plate and centering piece.
This filter MUST be installed with the spring plate.
A compressor that is allowed to operate without the
spring plate is running with unfiltered oil.
The filter housing can be evacuated and then
slowly pressurized to check for leaks before
returning to service.
C. Oil Pressure Regulating
On units with a full time oil pump, the back pressure
regulator, in the oil supply line from the separator,
controls upstream pressure to the compressor bearings and should be adjusted to hold the oil pressure
at 20 psig above suction pressure. Excess oil not
required for bearing lubrication is passed through
the regulator and flows into the separator.
1. Temperature Control Valve Installation & Position Indication
1.1 The ball valve is installed with the ball
closed.
1.2 The actuator mounts on the ball valve stem.
Flats on the ball valve stem indicate the position
of the ball:
OPEN – stem flats are with the flow
CLOSED – stem flats are across the flow
1.3 On smaller valves, the ball valve stem flats
are nearly hidden between the stem extension
and the stem lock nut. The locking tabs on the
stem lock nut are across the flow.
1.4 The actuator position indicator stem flats
are oriented in the same direction as the ball
valve stem flats.
D. Oil Cooling
Various types of oil coolers can be used to maintain
the oil injection temperature, usually either a watercooled shell-&-tube heat exchanger mounted locally
or a remotely located air-cooled fan-coil unit. In
either case, the oil temperature control valve operates the same. (See Appendix A: Pre Start Up for
Remote Oil Coolers)
A two-way ball valve is located in the main oil line
between the oil separator and the compressor. The
oil cooler is piped in parallel to the oil temperature
control valve, which acts as a by-pass valve (Figure 4).
1.5 There is a mechanical position indicator on
the top of the actuator cover.
NOTE: The oil temperature control valve comes
from the vendor already assembled with the ball
closed and the actuator in the CLOSED position.
2. Control Action
2.1 The ball valve can rotate through a full 360°
arc.
2.2 The actuator restricts the ball to a 90° arc of
travel.
2.3 The actuator is powered (120V or 24V) all
the time.
2.4 The position target signal from the compressor controller is a 4-20mA analog value.
2.5 There is no feedback position from the
actuator.
3. Initial Position
FIGURE 4.
TYPICAL WATER COOLED OIL COOLER DIAGRAM
3.1 With the electrical power to the valve deenergized, the valve is set to its initial position
31
Operation
by ensuring that the ball is in the closed position
and that the actuator indicator displays CLOSED.
3.2 When the electrical power to the valve is
energized, the valve should rotate to fully OPEN.
4.Operation
4.1 When initially installed, the ball must be in
the closed position.
4.2 When electrically energized, if the compressor is not running, the compressor controller will
turn the valve fully open (100%).
4.3 When the compressor starts, the valve
remains fully open (100%) until the oil injection
temperature rises above the control setpoint.
4.4When the oil injection temperature rises
above the control setpoint, the oil temperature
control valve will begin to close.
4.5 The hot oil from the oil separator begins to
divert to the oil cooler, mixing the hot and cooled
oil flow streams together downstream of the oil
temperature control valve. The valve can fully
close (0%) diverting the entire oil flow stream to
the oil cooler.
6.1 100% OPEN
oil flow stream is entirely bypassing the oil
cooler
6.2 99% to 1% OPEN
oil flow stream is partially by-passing the oil
cooler and partially diverted to the oil cooler
6.3 0% OPEN
oil flow stream is entirely diverted to the oil
cooler
G. Control Settings
The oil temperature control setpoints are entered on the compressor controller screen “Oil
Mixing Valve PID (Oil Return from Cooler)”.
8.0 Rotating the Actuator for Convenience of
Installation
The actuator can be rotated to any one of four
positions.
8.1 Remove both 120V and 24V power from
the actuator.
8.2 Disconnect electrical leads at actuator.
4.6 As the oil injection temperature drops below
the setpoint, the oil temperature control valve
begins to open so that the oil injection temperature does not become too cold.
8.3 Remove four cap screws that fasten the
actuator to the valve mounting bracket.
8.4 Lift the actuator off the valve stem.
4.7 When the compressor stops, the valve returns to fully open (100%).
8.5 Rotate the actuator to the desired position.
5. Fail Position
8.6 Slide actuator down on the valve stem.
The actuator remains in its last position when
power is removed.
8.7 Secure the actuator to the valve mounting
bracket with four cap screws.
6. Screen Display
8.8 Re-connect the electrical leads at the actuator.
The oil temperature control valve, identified as
“OIL MIX” on the main HMI display screen, shows
a numerical value with “%” as units. This is to be
understood as “% OPEN.” It is a direct indication
of the position of the ball valve.
32
8.9.Restore 120V and 24V power to the actuator.
Operation
NOTE: The ball valve and the actuator must
always be assembled in the CLOSED position.
See Section 3. Calibration above.
CAUTION: Be careful not to move the ball
stem during this operation. Turning the ball
valve 90° in either direction will reverse the
control action of the valve and the compressor
will experience high oil temperature within
minutes. Turning the ball valve 180° has no
detrimental effect.
9. Manual Override
The actuator has a handwheel that can be engaged to override the electrically determined
position of the ball valve.
Push and rotate to engage.
Push a second time to de-clutch.
CONTROL SYSTEM
Equipped for automatic operation, the screw compressor unit has safety controls to protect it from
irregular operating conditions, an automatic starting and stopping sequence, capacity and volume
ratio control systems.
Check all pressure controls with a remote pressure source, to assure that all safety and operating
control limits operate at the point indicated on the
microprocessor.
The unit is equipped with block and bleed valves
that are used to recalibrate the pressure transducers. To use the block and bleed valves to recalibrate
the pressure transducers, the block valve is shut
off at the unit and the pressure is allowed to bleed
off by opening the bleed valve near the pressure
transducer enclosure. The transducer can then be
calibrated at atmospheric pressure (0 psig), or an
external pressure source with an accurate gauge
may be attached at the bleed valve.
The discharge pressure transducer cannot be isolated from its pressure source, so it is equipped with
only a valve to allow an accurate pressure gauge to
be attached and the pressure transducer calibrated
at unit pressure.
Recheck the transducers periodically for any drift
of calibration.
A. Screw Compressor Control And Operation
1. Starting, Stopping and Restarting the Compressor.
Before the screw compressor unit may start,
certain conditions must be met. All of the safety
setpoints must be in a normal condition, and
the suction pressure must be above the low
suction pressure setpoint to assure that a load is
present. When the “On-Off” switch or “ManualAuto” button is pressed, the oil pump will start.
When sufficient oil pressure is built up and the
compressor capacity control and volume ratio
slide valves are at or below 10%, the compressor
unit will start.
If the compressor is in the automatic mode, it
will now load and unload and vary the volume
ratio in response to the system demands.
Stopping the compressor unit can be accomplished a number of ways. Any of the safety
setpoints will stop the compressor unit if an
abnormal operating condition exists. The compressor unit “On-Off” or stop button will turn
the compressor unit off as will the low pressure
setpoint. If any of these conditions turns the
compressor unit off, the slide valve motors will
immediately energize to drive the slide valves
back to 5% limit. The control motors will be deenergized when the respective slide valve moves
back below 5%. If there is a power failure, the
compressor unit will stop. If the manual start on
power failure option is selected (see appropriate
Microprocessor Instruction Manual), restarting
from this condition is accomplished by pushing
the reset button to insure positive operator
control. If the auto start on power failure option
is selected (see appropriate Microprocessor Instruction Manual), the compressor unit will start
up after a waiting period. With both options, the
compressor slide valves must return below their
respective 5% limits before the compressor unit
can be restarted.
33
Operation
When viewing the compressor from the discharge end (opposite the drive end), the upper
motor is for capacity control. The command
shaft turns (see Table 1) to decrease the capacity to 10% and reverses to increase the capacity
to 100%. The lower motor is for volume ratio
control. The command shaft turns (see Table 1)
to reduce the volume ratio to 2.0, and reverses
to increase the volume ratio to 5.0.
2. Slide Valve Control Actuators
Capacity and volume ratio control of the screw
compressor is achieved by movement of the
respective slide valves, actuated by electric
motors.
Note:
Optical Actuators CAN
NOT be manually rotated.
Actuation of the electric motors can be done
manually or automatically. To actuate the motors manually, place the desired mode selector
in the manual position and push the manual
Increase or Decrease buttons. In the automatic
mode, the microprocessor determines the direction to actuate the electric motors. However,
in the automatic mode, there is an “On” and
“Off” time for the capacity control motor. The
“On” time is the time in which the slide valve
moves, and the “Off” time is the time in which
the system is allowed to stabilize before another
change in slide valve position.
(The VSG 501-701 models
will have motor locations
opposite of figure #6)
FIGURE 6.
SLIDE VALVE MOTOR LOCATION
Table 1
COMP.
MODEL
COMMAND SHAFT ROTATION
CAPACITY
VOLUME INC
DEC
INC
DEC
VSSG 291 CW
VSSG 341 CW
VSSG 451 CW
VSSG 601 CW
VSG 751 CCW
VSG 901 CCW
VSG 791 CCW
VSG 891 CCW
VSG 1051 CCW
VSG 1201 CCW
VSG 1551 CCW
VSG 1851 CCW
VSG 2101 CCW
VSG 301 CW
VSG 361 CW
VSG 401 CW
VSG 501 CCW
VSG 601 CCW
VSG 701 CCW
34
CCW
CCW
CCW
CCW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CCW
CCW
CCW
CW
CW
CW
CW
CW
CW
CW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CW
CW
CW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CCW
CCW
CCW
CW
CW
CW
NO. OF TURNS / ROTATION
ANGLE / SLIDE TRAVEL
CAPACITY
VOLUME
TURNS/DEGREES/TRAVEL TURNS/DEGREES/TRAVEL
0.91
0.91
0.91
0.91
1.09
1.09
1.22
1.22
1.22
1.22
1.36
1.36
1.36
0.80
0.80
0.80
0.91
0.91
0.91
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
328
328
328
328
392
392
439
439
439
439
490
490
490
288
288
288
328
328
328
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
3.568”
3.568”
3.568”
3.568”
4.283”
4.283”
4.777”
4.777”
4.777”
4.777”
5.325”
5.325”
5.325”
3.141”
3.141”
3.141”
3.568”
3.568”
3.568”
0.52
0.52
0.52
0.52
0.63
0.63
0.74
0.74
0.74
0.74
0.82
0.82
0.82
0.45
0.45
0.45
0.52
0.52
0.52
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
187
187
187
187
227
227
266
266
266
266
295
295
295
162
162
162
187
187
187
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
2.045”
2.045”
2.045”
2.045”
2.473”
2.473”
2.889”
2.889”
2.889”
2.889”
3.200”
3.200”
3.200”
1.767”
1.767”
1.767”
2.045”
2.045”
2.045”
Operation
4. Oil Filter Differential
The Motor Amps Load Limit protects the compressor from overloading by decreasing the
compressor capacity if the motor amperage is
at the Maximum Amps setpoint, or preventing
an increase in capacity if the motor amperage is
above the Full Load Amps setpoint. (See Compact Logix PLC manual, p/n 35391CL.)
3. Oil Separator Heater
The oil separator heater keeps the oil in the
separator from becoming too viscous and helps
keep gas from condensing in the receiver section
of the separator.
The heater is turned on only when the compressor is off. The separator heater is supplied with
an integral temperature control.
High oil filter differential cutout stops
the compressor unit when the difference
between the outlet and inlet of the filter
exceeds the setpoint.
5. Oil Temperature
The oil temperature cutout stops the compressor unit when the oil temperature is too
high or too low.
6. Discharge Temperature
The high discharge temperature cutout
stops the compressor unit when the discharge temperature exceeds the setpoint.
INITIAL START-UP
B. Safety Setpoints
A. Setting of Controls
A detailed explanation of all safety setpoints can
be found in the Compact Logix PLC manual, p/n
35391CL.
Refer to the Compact Logix PLC manual (p/n
35391CL) for a list of initial settings.
1. Oil Pressure
Low oil pressure differential stops the compressor unit when there is an insufficient difference
in pressure between the oil manifold and suction.
2. Discharge Pressure
High discharge pressure cutout stops the compressor unit, when the discharge pressure in the
oil separator exceeds the setpoint.
3. Suction Pressure
Low suction pressure cutout stops the
compressor unit when the suction pressure
drops below the setpoint.
B. Valve Settings
1. The suction line uses separate stop and check
valves. Ensure the suction stop valve is open
prior to starting.
2. The ¼” suction equalization valve should be
closed during operation. The valve enables the
unit to slowly equalize to low side pressure during off periods. This valve must be adjusted to
minimize oil loss when compressor stops.
3. The discharge line uses separate stop and check
valves. Ensure the discharge valve is open prior
to starting.
4. Manually open the oil isolating valve at the oil
separator outlet connection.
5. Open the isolating valve(s) before and after the
oil filter housings.
35
Operation
6. Manually open the stop valve on the oil
bleed return line from the element section
and open the expansion valve 1/2 of a turn.
See Figure 7.
FIGURE 7.
OIL SEPARATOR BLEED LINE
NOTE:
The purpose of the oil bleed return assembly
is to collect any oil that passes through the
oil separating element and returns that oil to
the compressor. The hand expansion valve
should be adjusted to prevent an oil level
from forming in the sight glass when the
compressor is at 100% capacity. Generally
1/2 to 1 turn open is satisfactory.
7. Open 1/4” high pressure gas line valve piped to oil injection line just enough to quiet compressor at 100% capacity.
E. Compressor Pre Start-Up Check List
Before proceeding with actual starting of
the compressor, the items listed on the “Pre
Start-Up Check List” must be verified. Time
and money will be saved before the Vilter
start-up technician arrives. (See next page.)
36
Pre Start-Up Checklist
The following Check List is to help prepare the equipment before the Vilter Technician arrives at the jobsite. Vilter recommends that a Trained Technician go through the following tasks. The operating Manuals provided
by Vilter, can be referenced for any type of questions or special instructions.
Every Gas Compression unit includes a Vilter Start-Up (Confirm on PO). The following tasks are not included in
the Vilter Start-up provided in your equipment purchase. Any tasks below that are done by the Vilter Technician will take away from the pre-determined time that was provided with the equipment purchase. Vilter
suggests that the Vilter Technician’s time be used during the start-up of the System and not for the below
System Preparation.
Note: Each item below MUST be “Checked-Off”, Signed and Returned to the Vilter Service Department. Failure
to do so will “Null & Void” future Warranty considerations.
VILTER COMPRESSORS
1. The unit should be leveled and secured to the mounting pad or floor.
2. Proper electric supply and grounding need to be supplied to the unit. All power and control lines should be
wired to unit. Electric supply to be verified at each device requiring power.
3. Verify Any type of Level Switches that are on a Vessel before the compressor are hardwired and able to Shut
Off the compressor (Should be wired to Aux on Micro & Starter).
4. The suction and discharge line must be piped and properly supported independent of the unit.
5. The Discharge Stop and Check Valve is shipped loose and must be installed. During off periods, liquid can
condense in the line downstream of the Discharge Stop and Check Valve. It is recommended that the Stop
and Check Valve be located to minimize the quantity of liquid that can accumulate downstream of the valve.
6. A Dual Safety Relief Valve is shipped loose for field installation. A connection is provided on the oil separator
for the relief valve. Refer to ASME Code for proper sizing of relief valves and vent lines.
7. On Water Cooled Oil Coolers, the Water Lines must be connected to the front head of the Oil Cooler. Water
regulating and solenoid valves are recommended.
9. On Air Cooled Oil Coolers, the oil lines from the compressor must be connected to the Air Cooled oil cooler.
Oil Cooler Fans will need to be wired and checked for proper rotation. See air cooled section for further
detail. (Note the line going to the Air Cooled unit from the compressor should be connected to the bottom
connection of the Air Cooled Oil Cooler and the Return line to the compressor oil cooler should be connected to the top of the Air Cooled Oil Cooler – Refer to Standard Drawing in Manual).
10. The oil separator should be charged with oil until the oil level is halfway in the top sight glass.. An oil charging connection is provided on the bottom of the oil separator. For oil specifications and quantity, refer to the
Installation Section in the Operation & Service Manual.
37
Pre Start-Up Checklist
11. The center member of the compressor is shipped loose to help facilitate final field alignment and allow for
motor rotation check. The motor alignment should be within 0.004” total indicator reading in all directions
12. Both the compressor and motor hubs should be checked for concentricity and perpendicularity.
13. The motor should be checked and shimmed for a soft foot prior to attempting final alignment.
14. The motor should be checked to make sure that it is greased properly- (Note MOTOR MUST BE REGREASED
AFTER 40 HRS OF RUNNING TIME-SEE TOSHIBA MOTOR INSTRUCTIONS PROVIDED WITH THE UNIT).
15. The center section of the coupling should be left out to allow the start-up technician to verify the final alignment and motor rotations.
16. Charge Unit with oil to designated level in the Compressor Oil Separator (Refer to Drawings for Correct Oil
Charge and Manual for proper height between sight glasses).
17. Verify Position of all Valves are open.
18. A system load should be available at the time of startup.
19. The unit should be pressure tested and purged with a dry gas. Care should be taken to not pressurize excessively from the suction end of the compressor, as this will drive the compressor in a forward motion without
lubrication and may cause damage.
20. Have a qualified electrician present to verify wiring, during startup.
21. Keep a Hard Copy of the final set points in case the Micro gets corrupted or if they are required by Vilter technicians for trouble shooting.
38
Inspect Compressor
Bearings
Key:
Transducers
RTD's
Coalescing Elements
Suction Screen
Coupling Alignment
and Integrity
Oil Change
Oil Analysis (1)
Oil Filters
Oil Strainer
200
(I)
Inspect.
I
I
I
I
I
I
I
I
I
R
I
5,000
R
S
R
I
I
I
I
I
I
R
S
R
I
I
I
I
I
I
I
I
I
R
S
R
I
40,000
R
I
S
R
I
50,000
(S)
I
I
I
I
S
R
I
60,000
Sample.
I
I
I
I
R
I
R
S
R
I
70,000
I
I
I
I
S
R
I
I
I
I
I
I
R
S
R
I
80,000
BASED ON DRY CLEAN GAS
30,000
(R) Replace.
I
I
I
I
S
R
I
10,000
SERVICE INTERVAL (HOURS)
90,000
I
I
I
R
I
S
R
I
100,000
I
I
I
I
I
R
S
R
I
110,000
I
I
I
I
S
R
I
I
I
I
I
I
R
I
R
S
R
I
120,000
NOTE: See Motor Manual for proper lubrication procedures and service intervals.
(2) Note: The life of the compressor will be increased by purging the compressor unit with dry nitrogen or sweet, dry natural gas at
shutdown.
The life of the oil is directly affected by the quality of the gas. Proper separation of any liquids must be accomplished to prevent
droplets of liquid at the compressor suction. The discharge temperature of the compressor must be kept a minimum of 30°F above
the discharge gas dew point to prevent the condensing of liquids in the oil separator. The oil separator shell and legs must be
insulated when the gas stream has a high probability of having condensables.
(1) Note: Oil Analysis/Sampling is based on the gas stream. It is at the customer's discretion to increase the time period between oil
sampling if contamination of oil is unlikely, and to decrease the time period between oil sampling if oil contamination is likely or
evident. An oil sample must be taken when there is reason to believe the oil is contaminated anytime during operation. In landfill,
corrosive, and wet gas conditions, oil sampling is recommended every 3-4 months.
COMPRESSOR (2)
CONTROL
CALIBRATION
PACKAGE
OIL CIRCUIT
GROUP
INSPECTION
OR
MAINTENANCE
ITEM
20,000
Gas Compression "Maintenance and Inspection Schedule"
4/29/2009
Maintenance
Gas Compression Maintenance and Inspection Schedule
39
Service
GENERAL COMMENTS
When working on the compressor, care must be taken
to ensure that contaminants (i.e. water from melting
ice, dirt and dust) do not enter the compressor while
it is being serviced. It is essential that all dust, oil or
ice that has accumulated on the outside of the compressor be removed before servicing the compressor.
When servicing the compressor, all gaskets, O-rings,
roll pins and lock washers must be replaced when
reassembling the compressor.
B) Disconnect all gas and oil piping which is attached to the compressor. When removing the
suction strainer on gas compression units, the
suction line should be supported to prevent it
from sagging.
C) Replace oil drain in compressor housing and discharge manifold after oil has stopped draining.
D) Remove all electrical connections to the compressor.
PREPARATION OF UNIT FOR SERVICING
E) On VSG compressors with mounting feet, loosen
and remove bolts holding the compressor to the
base.
A) Shut down the unit, open the electrical disconnect switch and pull the fuses for the compressor
motor to prevent the unit from starting. Put a
lock on the disconnect switch and tag the switch
to indicate that maintenance is being performed.
B) Isolate the unit by manually closing the discharge
Stop valve. Allow the unit to equalize to suction
pressure before closing the Suction Bypass. After
the unit has equalized to suction pressure and
suction valve closed, use an acceptable means to
depressurize the unit that complies with all Local,
State and Federal Ordinances.
C) Remove drain plugs from the bottom of compressor housing and the discharge manifold. Drain
the oil into appropriate containers.
REMOVAL OF COMPRESSOR FROM THE UNIT
After preparing the unit for service, the following steps
should be followed when removing the compressor
from the unit:
A) Disconnect the motor drive coupling from the
compressor input shaft.
40
Keep compressor alignment shims together and
mark the locations with a permanent marker.
F) On VSG comnpressors with C- flange the
motor/C-flange/compressor assembly must be
supported with a chain fall or other lifting device
before the bolts holding the compressor to the
C-flange adapter can be removed.
G) Install appropriate lifting eye into the threaded
hole on the top of the compressor.
Verify unit is properly secured to avoid compressor
from falling. Re-verify all piping and electrical are
properly disconnected prior to lifting unit.
H) Lift compressor from the base, verify the amount
of room needed for clearance and weight of
the bare compressor when the compressor is
removed from the unit.
Service
INSTALLATION OF THE COMPRESSOR
A) After the work has been completed, reinstall
the compressor on the base or C-flange adapter
(dependent upon compressor model).
B) On the VSG units, replace the shims under the
compressor feet. Check for a soft foot. This is accomplished by tightening down three of the hold
down bolts and checking the clearance under the
fourth compressor foot. If there is clearance, add
the appropriate amount of shims. Tighten down
the fourth bolt and loosen either adjacent bolt
and check again for clearance, adding shims accordingly. Align the compressor and motor.
On VSG compressors the discharge elbow should
be tightened on the separator first, before the
compressor manifold flange is tightened. This
should be done to prevent compressor to motor
misalignment.
Replace all electrical, gas and oil connections
removed when servicing the compressor.
LEAK CHECKING UNIT
Note: Unit can be leak checked before evacuation.
CAUTION
Slowly pressurize the unit from the discharge side of the
compressor. Pressurizing the compressor from the suction side may cause rotation of the compressor without
oil supply, which could lead to internal damage.
A) Use a vacuum pump to evacuate the unit.
B) Break the vacuum on the unit using dry nitrogen
and check for leaks. Concentrate on areas where
work was done.
C) If no leaks are found, the unit can be returned to
service.
41
Service
Top View
Rotor Being Pushed By
Use Of Lever
Direction of rotor movement.
Axial force at coupling
to be 300-500lbs.
Rigidly attach dial indicator.
Position it on the axis of the
compressor.
Force to be determined
by length of level arm.
COMPRESSOR INSPECTION
The Vilter Single Screw Compressor is designed for
long periods of trouble free operation with a minimum of maintenance. However, a yearly inspection
is recommended so any irregular wear is noted and
rectified. At this time, the bearing float is measured
for the main rotor and gate rotors.
Small wooden block or fulcrum.
The following are the procedures used in measuring
the main rotor and gate rotor bearing float.
BEARING CHECK
CAUTION
Top View
Rotor Being Pushed in the
opposite direction by use of a lever.
Direction of rotor movement.
Axial force at coupling
to be 300-500lbs.
When taking the measurements, do not exceed 300
to 500 Lbs. of force at point of contact or damage
may result to the bearings
A) Shut down and de-pressurize the unit.
B) Main rotor bearing float.
Rigidly attach dial
indicator.
Position it on the
axis of the
compressor.
1) Remove the coupling guard, then remove
the center member from the coupling.
Small wooden block
or fulcrum.
Force to be determined
by length of level arm.
2) Attach a dial indicator to the compressor
frame as shown and zero indicator. Place a
lever arm and fulcrum behind the compressor coupling half and push the coupling
towards the motor (note measurement).
TABLE.1 MAXIMUM BEARING FLOAT
Side View
Showing gate rotor bearing float
being measured.
Direction of rotor movement.
Axial force at gate rotor to be
200 to 300 lbs.
Wooden block to prevent
damge to gate rotor blade.
MAIN
GATE
Bearing Float
0.003”
0.002”
Maximum Force 300 to 500 200 to 300
Lbs.
Lbs.
3) Re-Zero indicator, now position the fulcrum
on the motor and use the lever arm to push
the input shaft towards the compressor
(note measurement).
Force to be determined
Rigidly attach
by length of level arm.
dial indicator.
Use bolt for fulcrum.
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4) Add both readings, the total indicator movement is the bearing float and this should not
exceed 0.003”.
C) Gate rotor bearing float.
1) Remove the side covers and position a dial
indicator on the gate rotor.
2) Use a lever arm pivoting on a bolt with a small
block of wood against the gate rotor blade to
protect the blade.
3) The maximum amount of bearing float
should not exceed 0.002”.
TABLE 2. GATE ROTOR FLOAT
MODELFLOAT
VSG 301 THRU 401
0.045”
VSG 501 THRU 701
0.045”
VSSG 291 THRU VSSG 601
0.045”
VSG 751 & VSG 901
0.055”
VSG 1051 & VSG 1201
0.060”
VSG 1551 & VSG 2101 0.060”
E) Readings could be higher than 0.020. If readings
is greater than 0.030 over table tolerance contact
Vilter’s home office.
F) Inspect the main and gate rotors for signs of abnormal wear due to dirt or other contaminants.
G) After the inspection is complete, the covers,
coupling center member and guard can be reinstalled and the unit can then be evacuated and
leak checked before starting.
D) Measure the gate rotor to blade float. Some
movement between blade and support is necessary to prevent damage to the compressor blade,
however at no time should the blade uncover the
support.
1) Position the blade with the gate rotor damper
pin and 90º to the main rotor.
2) Position a dial indicator at the tip of the support. The total movement of the damper pin
in the bushing is the gate rotor float. Refer to
table 0.2 to find the maximum blade to support float (on new compressor parts only).
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GATE ROTOR ASSEMBLY CAUTION
Gate rotor removal and assembly is divided into distinct instructions, instructions for all VSG and VSSG
models and different instructions for all VSM models.
Please follow the appropriate set of instructions.
For VSG 451 thru 601
compressors, do not
use side rails.
REMOVAL ( All VSG)
90 1A
For VSSG 751/901 & VSG 1051/1201
compressors, use side rails and
assemble to gaterotor stablizer
as stamped.
90 1B
90 1C
A) Prepare the compressor for servicing.
NOTE: All parts must be kept with their appropriate side and not mixed when the compressor is reassembled.
B) Remove two upper bolts from the side cover,
and install guide studs in the holes. Remove the
remaining bolts and side cover. There will be
some oil drainage when the cover is removed.
C) Turn the main rotor so a driving edge of any one
of the main rotor grooves is even with the back
of the gate rotor support.
Drive End
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D) Insert the gate rotor stabilizer. The side rails
are not required on VSSG 291 thru 601. For the
VSG 751 thru 901 and VSG 1051 thru 1201
compressors, use the side rails and assemble to
the gate rotor stabilizer as stamped. For the VSG
1551 thru 2101, use the side rails and assemble
to the gate rotor stabilizer.
The gate rotor stabilizer is designed to hold the
gate rotor support in place and prevent damage
to the gate rotor blade as the thrust bearings and
housing is being removed.
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E) Remove the hex head and socket head bolts from
the thrust bearing cover. Insert two of the bolts
into the threaded jacking holes to assist in removing the cover. Retain the shim pack and keep it
with the bearing housing cover.
F) Hold the gate rotor support with a suitable wrench
on the flats provided near the roller bearing housing. Remove the inner retainer bolts and the
retainer. To remove the thrust bearing housing,
install the thrust bearing removal and installation
tool with the smaller puller shoe. Turn the jacking
screw clockwise. The thrust bearings and housing
assembly will be pulled off the shaft and out of the
frame.
G) Remove the bolts on the roller bearing housing.
Thread two bolts into the jack screw holes provided in the housing to assist in removing it.
H) To remove the gate rotor support, carefully move
the support opposite the direction of rotation and
tilt the roller bearing end towards the suction end
of the compressor. The compressor input shaft
may have to be turned to facilitate the removal of
the gate rotor support. On dual gate compressor
units, repeat the procedure for the remaining gate
rotor support assembly.
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Service
REMOVAL (ALL VSG 301-701 MODELS)
The removal of the gate rotor assembly for the VSG
301-701 compressors is similar for the VSG 9012101 compressors. The inner races are secured to
the stationary bearing spindle.
A) Prepare the compressor for servicing.
B) Remove the upper bolt from the side cover and
install a guide stud in the hole. Remove the
remaining bolts and side cover. There will be
some oil drainage when the cover is removed.
C) The side cover that contains the suction strainer
should have the suction line properly supported
before the bolts securing the line to the cover
can be removed. After the line is removed, the
cover can be removed per paragraph B.
D) Turn the main rotor so the driving edge of the
groove is between the top of the shelf or slightly
below the back of the gate rotor support. At
this point install the gate rotor stabilizing tool.
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Service
E) Remove plug on the thrust bearing housing.
Loosen the socket head cap screw that is located
underneath the plug. This secures the inner races
of the thrust bearings to the spindle.
F) Remove bolts that hold the thrust bearing housing to the compressor. Insert two of the bolts into
the threaded jacking holes to assist in removing
the bearing housing from the compressor. When
the housing is removed, there will be shims between the spindle and thrust bearings. These
control the clearance between the shelf and
gate rotor blades. These must be kept with their
respective parts for that side of the compressor.
G) Remove the bolts from the roller bearing housing.
After the bolts have been removed, the housing
can be removed from the compressor.
H) To remove the gate rotor support, carefully move
the support opposite the direction of rotation
and tilt the roller bearing end towards the suction end of the compressor. The compressor
input shaft may have to be turned to facilitate the
removal of the gate rotor support. On dual gate
versions, repeat the procedure for the remaining
gate rotor support assembly.
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Service
INSTALLATION (All VSG Models)
A) Install the gate rotor support by carefully tilting
the roller bearing end of the gate rotor support
towards the suction end of the compressor. The
compressor input shaft may have to be rotated
to facilitate the installation of the gate rotor support.
Install gate rotor stabilizer. The gate rotor stabilizer (901) will hold the gate rotor support
in place as the thrust bearing housing is being
installed. If the gate rotor support is not restricted from moving, the gate rotor blade may
be damaged.
B) Install the roller bearing housing (112) with a
new O-ring (141). Tighten the bolts (152) to the
recommended torque value.
C) When installing the thrust bearing housing
(113), a new O-ring (142) must be used when
the housing is installed. Lubricate the outside of
the housing and bearings with clean compressor
oil to aid in the installation. Due to the fit of the
bearings on the gate rotor shaft, the thrust bearing removal and installation tool with the pusher
shoe must be used. Turn the jacking screw clockwise. This will push the thrust bearings onto the
shaft and push the housing assembly into the
frame. Install the inner retainer (115) and bolts
(151) using Loctite® 242 thread locker. Tighten
the bolts to the recommended torque value.
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D) Set the clearance between the gate rotor blade
and the shelf.
1.
Place a piece of 0.003”-0.004” shim stock
between the gate rotor blade and the shelf.
2.
Measure the depth from the top of the compressor case to the top of the thrust bearing
housing. This determines the amount of
shims needed for the correct clearance.
3.
Use factory installed shim pack (106) and
bearing housing cover (116) without the Oring (143). Check the clearance between the
entire gate rotor blade and the shelf, rotate
the gate rotor to find the tightest spot. It
should be between 0.003”-0.004”. Make
adjustments, if necessary. It is preferable to
shim the gate rotor blade looser rather than
tighter against the shelf.
Note: Replacement blades are precisely the same
dimensionally as blades installed originally at factory: Therefore, the same amount of shims will be
required for replacement blades.
E) After clearance has been set install a new O-ring
(143) on bearing housing cover, install cover and
tighten the bolts to the recommended torque
value.
F) Install side cover with a new gasket. Tighten the
bolts to the recommended torque value. The
unit can then be evacuated and leak checked as
outlined in section 0.03.
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INSTALLATION (All VSG 301-701 Models)
A) Install the gate rotor support. Carefully tilt the
roller bearing end of the gate rotor support towards the suction end of the compressor. The
compressor input shaft may have to be rotated
to facilitate the installation of the gate rotor
support.
B) Install the roller bearing housing with a new
O-ring. Tighten the bolts to the recommended
torque value.
C) Install the spindle with shims and o-ring, tighten
the bolts to the recommended torque value,
measure the clearance between the shelf and
blade.
Gaterotor for C-flange Models
D) Check the clearance between the entire gate
rotor blade and the shelf, rotate the gate rotor
to find the tightest spot. It should be between
0.003”-0.004”. Make adjustments, if necessary.
It is preferable to shim the gate rotor blade
looser rather than tighter against the shelf.
E) Once the clearance is set remove the spindle.
Install new o-ring, apply Loctite 242 thread
locker to the socket head cap screw clamping
the thrust bearings to the spindle. Torque all
bolts to the recommended torque values.
F) Install side covers with new gaskets. Tighten
bolts to the recommended torque value. The
unit can now be evacuated and leak checked as
outlined in section 0.03.
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Service
GATE ROTOR BLADE REMOVAL
A) Remove the gate rotor assembly.
B) Remove the snap ring and washer from the gate
rotor assembly. Lift gate rotor blade assembly off
the gate rotor support.
C) Check damper pin and bushing for excessive wear.
Replace if necessary.
TOP of assembly
Relief area faces TOP of assembly.
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GATE ROTOR BLADE INSTALLATION
(with Relief)
A) Install damper pin bushing (120) in gate rotor
blade (111) from the back side of the blade. Be
sure the bushing is fully seated.
B) Place the blade assembly on the gate rotor support. Locating Damper over pin.
C) Install washer (119) and snap ring (130) on gate
rotor assembly. The bevel on the snap ring must
face away from the gate rotor blade. After the
gate rotor blade and support are assembled,
there should be a small amount of rotational
movement between the gate rotor and support.
D) For installation of the gate rotor assembly and
setting of gate rotor clearance, refer to section
INSTALLATION (All VSG 301-701 Models).
GATE ROTOR THRUST BEARING REMOVAL
A) Refer to section INSTALLATION (All VSG Models)
for removal of the gate rotor bearing housings
and gate rotor supports.
B) For removal of thrust bearings on VSG units:
1) Remove bolts (150) from the clamping ring
(114).
2) Remove thrust bearing clamping ring.
3) Remove thrust bearings (126) from housing
(113).
C) For removal of thrust bearings on VSSG units:
1) Remove retaining ring from gate rotor support.
2) Remove bearings from support.
3) Remove bearing retainer from inner race.
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GATE ROTOR THRUST BEARING INSTALLATION
A) For installation of thrust bearings on VSG and
VSSG units:
1) Install bearings (126) in the housing so the
bearings are face to face.
The larger sides of the inner races are
placed together. A light application of
clean compressor lubricating oil should
be used to ease the installation of the
bearings into the housing.
2) Center the bearing retainer ring on housing, use Loctite® 242-thread locker and
evenly tighten the bolts to the recommended torque value.
3) For installation of the bearing housing and
the setting of the gate rotor blade clearance, refer to section INSTALLATION (All
VSG Models).
B) For installation of thrust bearings on VSG 301701 units:
Inner Retainer
1) Install retainer in the back of the inner race
of one of the thrust bearings. The back of
the inner race is the narrower of the two
sides.
2) The bearing with the retainer should
be placed in the housing first, retainer
towards the support. Install the second
bearing. The bearings should be positioned face to face. This means that the
larger sides of the inner races are placed
together. A light application of clean compressor lubricating oil should be used to
ease the installation of the bearings into
the gate rotor support.
Retaining Ring
Ball Bearings
3) Install the bearing retaining snap ring.
4) For installation of the bearing housing and
the setting of the gate rotor blade clearance, refer to section INSTALLATION (All
VSG Models).
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GATE ROTOR ROLLER BEARING REMOVAL
A) Refer to section REMOVAL ( All VSG) for removal
of the gate rotor bearing housings and gate rotor
supports.
B) Remove the snap ring (131), which retains the
roller bearing in the bearing housing.
C) Remove the roller bearing (125) from the bearing
housing (112).
D) Use a bearing puller to remove the roller bearing
race (125) from the gate rotor support (110).
GATE ROTOR ROLLER BEARING INSTALLATION
A) Match up the part numbers on the inner race to
the part numbers outer race. Press the bearing
race (numbers visible) onto the gate rotor support.
B) Install the outer bearing into the bearing housing
so the numbers match the numbers on the inner
race. Install the snap ring retainer in the housing.
The bevel on the snap ring must face away from
the roller bearing.
C) For installation of the bearing housing, refer to
section INSTALLATION (All VSG Models).
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COMPRESSOR SHAFT SEAL REPLACEMENT
Seal with stationary mirror face (219B) and
rotating carbon face (219C).
Seal with stationary carbon face (219B)
and rotating mirror face (219C).
COMPRESSOR SHAFT SEAL REMOVAL
Current Shaft Seal and for all Replacement.
A) Prepare the compressor for servicing as outlined
in section REMOVAL ( All VSG) .
B) Remove bolts (281) holding the shaft seal cover
(218). Insert two of the bolts into the threaded
jacking holes to assist in removing the cover.
There will be a small amount of oil drainage as
the cover is removed.
C) Remove the rotating portion of the shaft seal
(219C).
D) Remove oil seal (230) from cover.
E) Remove the stationary portion of the shaft seal
(219B) from the seal cover using a brass drift and
hammer to tap it out from the back side of the
seal cover.
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Service
COMPRESSOR SEAL INSTALLATION
NOTE:
When replacing the stationary members of the seal on
the VSSG 291 thru VSSG 601 the roll pin in the cover
is used only with the seal assembly having a stationary mirror face. If a seal assembly with a stationary
carbon face is installed, the roll pin must be removed.
A) Install new oil seal in cover.
CAUTION
Care must be taken when handling the shaft seal and
mirror face so it is not damaged. Do not touch the
carbon or mirror face as body oil and sweat will cause
the mirror face to corrode.
B) To install the carbon cartridge part of the seal
in the seal cover; clean the seal cover, remove
protective plastic from the carbon cartridge, do
not wipe or touch the carbon face. Lubricate the
sealing O-ring with clean compressor lubricating
oil. If applicable, align the hole on the back of
the carbon cartridge with the dowel pin in the
seal cover. Install cartridge using seal installation
tool or similar (see tool lists).
C) Wipe clean, the compressor input shaft and the
shaft seal cavity in the compressor housing. Apply clean compressor oil to the shaft seal seating
area on input shaft.
D) Lubricate the inside area of the rotating seal with
clean compressor lubricating oil, do not wipe
or touch the face of the rotating portion of the
seal. Align the slot in the rotating seal with the
drive pin on the compressor input shaft. Carefully push the seal on, holding onto the outside
area of the seal until the seal seats against the
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shoulder on the input shaft. Make sure the seal
is seated against the shoulder. If the seal is not
fully seated against the shoulder, the shaft seal
carbon will be damaged when the seal cover is
installed.
Maintenance Suggestion:
A spray bottle filled with clean compressor oil
may be used to lubricate the faces of the seals
without touching the seal.
MAIN ROTOR ASSEMBLY
Due to the procedures and tools involved in the disassembly and reassembly, the main rotor assembly must
be performed by qualified individuals. Please consult the factory if maintenance is required.
E) Install a new O-ring on the seal cover, making
sure the O-ring is placed in the O-ring groove
and not the oil gallery groove. Lubricate both
seal faces with clean compressor lubricating oil.
F) Carefully install the seal cover on the compressor
shaft, evenly tightening the bolts to the recommended torque values.
G) Install the coupling and coupling guard. The unit
can then be evacuated and leak checked.
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Service
INSPECTION OF SLIDE VALVE ASSEMBLIES IN
THE COMPRESSOR
Prepare the compressor for servicing.
A) Remove the gate rotor access covers. Using a
mirror and flashlight, visually inspect the slide
valve carriage through the gas bypass opening.
Look for any significant signs of wear on the slide
valve carriage.
B) To check the clearance of the slide valve clamps,
the gate rotor support must be removed. Refer
to removal of the gate rotor support.
C) Using a feeler gauge, inspect the clearance between capacity and volume slide valve clamps
and slide valve carriage through the gas bypass
opening. The clearance should be less than
0.002”.
D) If the slide valves are worn in excess of the tolerances, the factory should be contacted.
REMOVAL SLIDE VALVE CARRIAGE ASSEMBLIES
A) Prepare the compressor for servicing.
B) If only one of the slide valve carriages is removed
only the corresponding gate rotor support
needs to be removed. If both carriages are
removed both gate rotors must be removed.
Remove the gate rotor assemblies.
C) Remove the capacity and volume actuators.
Remove the discharge manifold, capacity and
volume cross shafts and the slide valve racks.
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D) Locate and remove the socket head plugs above
the slide valve carriage attachment bolts. Remove the bolts located under the plugs.
E) The slide valve carriage may now be removed.
On newer carriages there is a threaded hole in
the back of the slide valve carriage to aid in its
removal. Use a threaded tip slide hammer to aid
in the removal of the carriage.
Note: Slide Valves may be re-positioned to aid in
removal of assembly.
INSTALLATION OF SLIDE VALVE CARRIAGE ASSEMBLIES
A) Position the slide valves to the center of the carriage. Place the slide valve assembly in the bore of
frame and use the slide hammer to slowly tap the
carriage into position. Re-positioning slide valves
once inside bore may aid installation. Adjust the
carriage so that the 3-holes line up.
B) Install the 3 socket head cap screws with new
Nord-Lock washers beneath the heads, but do
not tighten them.
C) Work a piece of 0.005”shim stock between the
slide valves and the main rotor to help position
the carriage.
D) Tighten, to the correct torque the hold down
bolts to secure the carriage in the frame. The
edges of the slide valves themselves should be
at or slightly below the main rotor bore.
E) Re- Install the capacity and volume slide valve
cross shafts, slide valve racks and discharge
manifold.
F) Re-install the gate rotor assemblies.
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COMMAND SHAFT ASSEMBLY REMOVAL
The following steps can be used to remove or install
either the capacity or volume command shaft assemblies.
A) Prepare the compressor for servicing.
B) Follow the appropriate instructions to remove
control actuator.
.
C) Remove four socket head cap screws (457) and
Nord-Lock washers (477) securing mounting
plate (415) to manifold.
D) The command shaft and mounting plate may
now be removed from the compressor.
457 477
415
B) Install the actuator mounting plate with the four
socket head cap screws and Nord-Lock washers
securing it with proper torque.
C) The unit can now be leak checked.
COMMAND SHAFT BEARING AND O-RING SEAL
REPLACEMENT
A) Remove command shaft assembly.
B) Remove snap ring retainer (451) from command
shaft housing (412). Push the command shaft assembly out of the housing.
COMMAND SHAFT ASSEMBLY INSTALLATION
A) Install the command shaft assembly with a new
o-ring (446) on the manifold. Make sure that the
command shaft tongue is engaged in the cross
shaft slot. Rotate the bearing housing so the
vent holes point down, this will prevent water
and dust from entering the vents.
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C) The command shaft bearing (435) is a press
fit on the command shaft (413). Remove the
command shaft bearing with a suitable press.
Ven t ho le.
436
445
Reference “Parts
Section” for current
Housing
DISCHARGE MANIFOLD REMOVAL
A) Remove both control actuators and command
shaft assemblies.
B) On VSG751-2101 and VSSG 291-601 compressors, remove the discharge spool between the
manifold and separator. Remove one bolt from
each side of the discharge manifold and install
(2) guide rods approximately 6” long, to support
the manifold. Remove the remaining bolts (note
length and location of bolts) and take off the
discharge manifold.
D) Remove the O-ring seal (445) from the command shaft housing. The command shaft bushing (433 and 436) might have to be removed to
gain access to o-rings. Replace bushing if the
bore is deeply scored or excessively worn.
Note: Mainfold has dowel pins to locate it on the
compressor housing. Therefore, remove manifold
straight back approximately 1” as not to break
dowel pins.
COMMAND SHAFT BEARING AND O-RING
SEAL REASSEMBLY
A) Install new O-ring seal in housing and lubricate
the O-ring with clean compressor oil. A vent
hole is provided in the command shaft bearing
housing to allow any gas and oil that may leak
past the O-ring seal to vent to atmosphere and
not into the slide valve motor housing. Install
snap ring retainer and washer on the command
shaft.
B) Remove any burrs from the command shaft to
prevent damage to the O-ring when assembling.
Press the command shaft bearing onto the
command shaft. Insert the command shaft into
the housing applying pressure on outer race of
bearing. Make sure the bearing is fully seated
in the command shaft housing. Install the snap
ring retainer in the command shaft housing.
C) Install command shaft assembly.
NOTE:
When removing the discharge manifold on VSG 301-701
compressor the compressor must be properly supported
to keep the compressor from moving when the manifold
is removed.
C) On VSG 301-701 compressors unbolt the discharge flange from the discharge manifold.
D) Remove one bolt from each side of the discharge
manifold and install (2) guide rods approximately
6” long, to support the manifold. Remove the
remaining bolts (note length and location of bolts)
and take off the discharge manifold.
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DISCHARGE MANIFOLD INSTALLATION
A) Install (2) guide rods to position the discharge
manifold. Install a new manifold gasket and
the discharge manifold. Install the dowel pins
and bolts, tighten manifold bolts to the recommended torque value.
B) On VSG 751-2101 and VSSG 291-601 compressors install the discharge spool or elbow between the discharge manifold and oil separator
with new gaskets. When installing the discharge
elbow tighten the bolts to the correct torque on
the manifold flange first before tightening the
separator flange bolts. Install the drain plug in
the bottom of the discharge manifold.
C) On VSG 301-701 compressors install the bolts
in the discharge flange. Install the drain plug in
the bottom of the discharge manifold.
D) Install both command shaft assemblies and
control actuators.
SLIDE VALVE GEAR AND RACK INSPECTION
A) Remove the discharge manifold.
B) Check rack to rack clamp and rack clamp spacer
clearance on all four slide valves.
TABLE 4.1
RACK CLEARANCE VALUES
MEASUREMENTCLEARANCE
Rack to clamp.
0.005 to 0.010”
Rack to clamp spacer.
0.003 to 0.005”
C) Check torque of socket heat cap screws.
D) Check for excessive movement between the
slide valve rack shafts and the rack. The jam nuts
on the end of the slide valve rack shaft should be
tight.
E) Check for loose or broken roll pins in gears.
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F) Look for any excessive wear on all moving parts
and replace the worn parts.
G) Reassemble the manifold and discharge elbow.
REMOVAL OF CAPACITY OR VOLUME CROSS
SHAFTS
A) Remove the discharge manifold.
B) To remove the capacity or volume ratio slide
valve racks, remove the two jam nuts and lock
washers (361) securing the rack (316) to the slide
valve shafts. The racks can now be pulled off the
slide valve shafts. Repeat the procedure for the
remaining pair of slide valve racks.
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C) To remove the cross shafts, remove socket head
bolts, clamp and spacers from both sides.
VSG 751-2101 compressors cross shafts.
INSTALLATION OF CAPACITY OR VOLUME
CROSS SHAFTS
A) To reassemble either set of capacity or volume
ratio slide valve racks, install the cross shaft with
the pinion gear onto the back plate, place the
remaining pinion gear on the shaft and drive in
the roll pins. Install clamps, spacers and bolts
on both sides. Tighten the bolts to the recommended torque values.
VSSG 291-601 compressors cross shafts
Volume control cross shaft.
B) The slide valve sets must be synchronized on VSG
751-2101 and dual gate VSG 301-701 units. Both
slide valve racks for either the volume ratio or
capacity slide valves must engage the cross shaft
gears at the same time. Push the racks all the way
towards the suction end of the compressor until
they stop. Install washers and jam nuts on the
slide valve shafts. Repeat the procedure for the
remaining set of slide valve racks.
Capacity control cross shaft.
D) Drive the roll pins from pinion gear from one
side. Remove pinion gear. Slide the cross shaft
with the remaining pinion gear or spacers out of
the opposite side. Repeat the procedure for the
remaining cross shaft.
C) Install (2) guide rods to position the discharge
manifold. Install a new manifold gasket and
the discharge manifold. Install the dowel pins
and bolts, tighten manifold bolts to the recommended torque value.
D) On VSG 751-2101 and VSSG 291-601 and VSG
301-701 compressors install the discharge.
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TORQUE SPECIFICATIONS (ALL UNITS IN FT.-LBS)
TYPE BOLT
HEAD
MARKINGS
1
/4”
5
OUTSIDE DIAMETER OF BOLT SHANK
3
7
1
9
5
/16”
/8”
/16”
/2”
/16”
/8”
3
/4”
SAE GRADE 2
6 122032476996155
SAE GRADE 5
1019335478114154
257
SAE GRADE 8
14294778119169
230
380
SOCKET HEAD CAP SCREW
16335484125
180
250
400
TORQUE SPECIFICATION FOR 17-4 STAINLESS STEEL FASTENERS (FT-LBS)
TYPE ¼”
5/16” 3/8” 7/16” ½”
9/16” 5/8” ¾”
HEX & SOCKET
HEAD CAP
SCREW
8
14
101
NUT
8
25
40
60
137
245
NOTE: CONTINUE USE OF RED LOCTITE ON CURRENTLY APPLIED LOCATIONS. USE BLUE
LOCTITE ON ALL REMAINING LOCATIONS.
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USING A TORQUE WRENCH CORRECTLY
TORQUE WRENCHES
USING A TORQUE WRENCH CORRECTLY INVOLVES FOUR PRIMARY CONCERNS:
A. A smooth even pull to the break point is required. Jerking the wrench can cause the pivot point
to break early leaving the bolt at a torque value lower then required. Not stopping when the
break point is reached results in an over torque condition.
B. When more than one bolt holds two surfaces together there is normally a sequence that
should be used to bring the surfaces together in an even manner. Generally bolting is tightened incrementally in a diametrically staggered pattern. Some maintenance manuals specify
a tightening scheme. If so, the manual scheme shall be followed. Just starting on one side and
tightening in a circle can cause the part to warp, crack, or leak.
C. In some cases threads are required to be lubricated prior to tightening the bolt/nut. Whether
a lubricant is used or not has considerable impact on the amount of torque required to achieve
the proper preload in the bolt/stud. Use a lubricant, if required, or not if so specified.
D. Unlike a ratchet wrench a torque wrench is a calibrated instrument that requires care. Recalibration is required periodically to maintain accuracy. If you need to remove a bolt/nut do not
use the torque wrench. The clockwise/counterclockwise switch is for tightening right hand or
left hand threads not for loosening a fastener. Store the torque wrench in a location where it
will not be bumped around.
65
Service
A. The Nord-Lock® lock washer sets are used in many
areas in both the VSG & VSSG screw compressors that
require a vibration proof lock washer.
B. The lock washer set is assembled so the course
serrations that resemble ramps are mated together.
C. Once the lock washer set is tightened down, it
takes more force to loosen the bolt that it did to
tighten it. This is caused by the washers riding up
the opposing ramps.
66
Parts Section
Recommended
Spare Parts List
Refer to the Custom Manual
Spare Parts Section for Specific Applications
Please have your Model # and Sales Order # available when ordering.
These are found on the compressor’s Name Plate.
67
Gate Rotor
68
Gate Rotor
MODEL NUMBER
ITEM DESCRIPTION
VSSG 451
VSSG 601
QTYVPN
QTYVPN
GATE ROTOR BLADE AND BEARING
102
105
106
110
111
REPLACEMENT KIT, 111, 118, 120A,
120B, 121, 122, 123, 124, 125, 126,
130, 131, 141, 142 & 143.
GATE ROTOR BLADE REPLACE
KIT, 111, 118, 120A, 120B, 121, 122,
123, 124, 130, 141, 142 & 143.
GATE ROTOR SUPPORT ASSEMBLY
100, 111, 120B, 119 & 130.
GATE ROTOR GASKET SET 118, 141,
142 & 143.
SHIM PACK SET (2) 121, (2) 122,
(1) 123, (1) 124.
SUPPORT.
GATE ROTOR.
112
SMALL BEARING HOUSING.
113
LARGE BEARING HOUSING.
114RETAINER.
115RETAINER.
116
BALL BEARING COVER.
117
GATE ROTOR COVER.
118
GATE ROTOR COVER GASKET.
119WASHER.
120A BUSHING, SMALL DOWEL PIN.
120B BUSHING, LARGE DOWEL PIN.
121
SHIM 0.002”.
122
SHIM 0.003”.
123
SHIM 0.005”.
124
SHIM 0.010”.
125
ROLLER BEARING.
126
BALL BEARING.
130
RETAINING RING.
131
RETAINING RING.
135A DOWEL PIN, SM, 0.250” O.D..
135B DOWEL PIN, LG, 0.4375” O.D..
141
O-RING ROLLER BRG HSG.
142
O-RING BALL BRG HSG.
143
O-RING BRG HSG COVER.
150
HEX HEAD CAP SCREW.
151
HEX HEAD CAP SCREW.
152
HEX HEAD CAP SCREW.
153
HEX HEAD CAP SCREW.
160
SOCKET HEAD CAP SCREW.
2
KT712A
2
KT712B
2
KT713A
2
KT713B
2
A25161BB 2
A25161BA
2
A25164B
2
A25164B
2
2
2
A25165B
25606A
25557A
2
2
2
A25165B
25520A
25534A
2
2
2
2
2
2
2
2
2
2
ar
ar
ar
ar
2
4
2
2
2
2
2
2
2
12
6
40
32
12
25518A
25517A
25008A
25009A
25258A
25519A
25259A
25007A
25006A
25760A
25010AA
25010AB
25010AC
25010AD
2864B
2865B
2866A
2867A
2868B
25910A
2176M
2176R
2176N
2796AJ
2796B
2796CJ
2796E
2795E
2
2
2
2
2
2
2
2
2
2
ar
ar
ar
ar
2
4
2
2
2
2
2
2
2
12
6
40
32
12
25518A
25517A
25008A
25009A
25258A
25519A
25259A
25007A
25006A
25760A
25010AA
25010AB
25010AC
25010AD
2864B
2865B
2866A
2867A
2868B
25910A
2176M
2176R
2176N
2796AJ
2796B
2796CJ
2796E
2795E
NOTE: ar = As Required
69
Gate Rotor
ITEM DESCRIPTION
VSG 751
VSG 901
VSG 1051
VSG 1201
QTYVPN
QTYVPN
QTYVPN
QTYVPN
GATE ROTOR BLADE AND BEARING
REPLACEMENT KIT, 111, 118, 120A,
120B, 121, 122, 123, 124, 125, 126,
130,131, 141, 142 & 143.
2
KT712C
2
KT712D
2
KT712E
2
KT712F
GATE ROTOR BLADE REPLACE
KIT, 111, 118, 120A, 120B, 121, 122,
123, 124, 130, 141, 142 & 143.
2
KT713C
2
KT713D
2
KT713E
2
KT713F
102
GATE ROTOR SUPPORT ASSEMBLY
100, 111, 120B, 119 &130
2
A25161CB 2
A25161CA 2
A25161DB 2
A25161DA
105
GATE ROTOR GASKET SET 118, 141,
142 & 143.
2A25164C
2A25164C
2A25164D
2A25164D
SHIM PACK SET (2) 121, (2) 122,
(1) 123, (1) 124.
2A25165C
2A25165C
2A25165C
2A25165C
110SUPPORT.
225612A
225553A
225614A
225587A
111GATE ROTOR.
225608A
225554A
225610A
225588A
118GATE ROTOR COVER GASKET. 225088A
225088A
225132A
225132A
119WASHER.
225086A
225086A
225086A
225086A
120A
BUSHING, SMALL DOWEL PIN. 225087A
225087A
225104A
225104A
120B
BUSHING, LARGE DOWEL PIN. 225760B
225760B
225760B
225760B
121*
SHIM 0.002”.
ar25089AA
ar25089AA
ar25089AA
ar25089AA
122*
SHIM 0.003”.
ar25089AB
ar25089AB
ar25089AB
ar25089AB
123*
SHIM 0.005”.
ar25089AC
ar25089AC
ar25089AC
ar25089AC
124*
SHIM 0.010”.
ar25089AD
ar25089AD
ar25089AD
ar25089AD
125
ROLLER BEARING.
22864C22864C22864G22864G
126
BALL BEARING.
42865A42865A42865A42865A
130
RETAINING RING.
22866B22866B22866B22866B
131
RETAINING RING.
22867E22867E22867L22867L
135A DOWEL PIN, SMALL, 0.3125” O.D..
2
2868F
2
2868F
2
2868H
2
2868H
135B DOWEL PIN, LARGE, 0.4375” O.D.. 2
25910B
2
25910B
2
25910B
2
25910B
141
O-RING ROLLER BRG HSG.
22176N22176N22176AJ
22176AJ
142
O-RING BALL BRG HSG.
22176V22176V22176AM
22176AM
143
O-RING BRG HSG COVER.
22176U22176U22176U22176U
ar = As Required
70
Gate Rotor
ITEM
DESCRIPTION
VSG 1551
VSG1851
VSG 2101
QTY
VPNQTY
VPNQTY
VPN
GATE ROTOR BLADE AND BEARING
REPLACEMENT KIT, 111, 118, 120A,
120B, 121, 122, 123, 124, 125, 126, 130,
131, 141, 142 & 143.
2
KT712L
2
KT712M
2
KT712K
GATE ROTOR BLADE REPLACEMENT
KIT, 111, 118, 120A, 120B, 121, 122, 123,
124, 130, 141, 142 & 143.
2
KT713G
2
KT713H
2
KT713L
101
GATE ROTOR ASSEMBLY 111 & 120.
2
A25160EB
2
A25160EA
2
A25160EA
102
GATE ROTOR SUPPORT ASSEMBLY
100, 111, 120B, 119 &130.
2
A25161EB
2
A25161EA
2
A25161EL
104
SHIM, 350MM GATE ROTOR
BALL BEARING (VSS)2
25977U2
25977U2
25977U
105
GATE ROTOR GASKET SET 118, 141,
142 & 143. 2A25164E 2A25164E 2A25164E
SHIM PACK SET (2) 121, (2) 122,
(1) 123, (1) 124.
2
A25165E
2
A25165E
2
A25165E
110
SUPPORT.2
25687A2
25665A2
25495D
111
GATE ROTOR.2
25647A2
25645A2
25744D
112
SMALL BEARING HOUSING. 226507A 226507A 226507A
113
LARGE BEARING HOUSING. 226506A 226506A 226506A
114
RETAINER.2
25141A2
25141A2
25141A
115
RETAINER.2
25789A2
25789A2
25789A
116
BALL BEARING COVER.2
25351A2
25351A2
25351A
117
GATE ROTOR COVER.2
26508B2
26508B2
26508B
118
GATE ROTOR COVER GASKET.
2
26509A
2
26509A
2
26509A
119
WASHER.2
25788A2
25788A2
25788A
120B
BUSHING, LARGE DOWEL PIN.
2
25760C
2
25760C
2
25760C
121*
SHIM 0.002”. ar25791AA ar25791AA ar25791AA
122*
SHIM 0.003”. ar25791AB ar25791AB ar25791AB
123*
SHIM 0.005”. ar25791AC ar25791AC ar25791AC
124*
SHIM 0.010”. ar25791AD ar25791AD ar25791AD
125
ROLLER BEARING.2
2864K2
2864K2
2864K
126
BALL BEARING.4
2865K4
2865K4
2865K
130
RETAINING RING.2
2866G2
2866G2
2866G
131
RETAINING RING.2
2867R2
2867R2
2867R
135B
DOWEL PIN, LARGE, 0.500” O.D..
2
25910C
2
25910C
2
25910C
141
O-RING ROLLER BRG HSG.
2
2176U
2
2176U
2
2176U
142
O-RING BALL BRG HSG.2
2176BD2
2176BD2
2176BD
143
O-RING BRG HSG COVER.
2
2176P
2
2176P
2
2176P
150
HEX HEAD CAP SCREW.
12
2796CJ
12
2796CJ
12
2796CJ
151
HEX HEAD CAP SCREW.
8
2796N
8
2796N
8
2796N
152
HEX HEAD CAP SCREW.
32
2796CJ
32
2796CJ
32
2796CJ
153
HEX HEAD CAP SCREW.
44
2796R
44
2796R
44
2796R
160
SOCKET HEAD CAP SCREW.
16
2795G
16
2795G
16
2795G
ar = As required
71
Shaft Seal
Shaft Seal With Stationary Carbon Face
MODEL NUMBER
ITEM DESCRIPTION
VSSG 291-601
VSG 751-1201
VSG 1551 thru 2101
QTYVPN
QTYVPN
QTYVPN
SHAFT SEAL VITON KIT, 219, 260, 230
1KT709AG
1KT709BG
1KT709CG
230
OIL SEAL.
260
O-RING.
72
125040A
125064A
12930B
12176F12176AC
12176BH
Tandem Shaft Seal
DESCRIPTION
TANDEM SHAFT SEAL
SHAFT DIAMETER
2.25”
2.5”
2.875”
QTYVPN
QTYVPN
QTYVPN
125713A
125713A
125713A
125713B
125713B
125713B
73
Main Rotor
74
75
207
SHIM PACK 1 A25177B
1 A25177B
ITEM DESCRIPTION
VSSG 451
VSSG 601
QTY PART#
QTY PART#
201
ROTOR ASSY 1 A25168BB 1 A25168BA
(DOES NOT INCLUDE
SHIM PACK #207)
MODEL NUMBER
A25168CB
1 A25177C
1
1
1
A25177C
A25168CA
VSG 751
VSG 901
QTY PART# QTY PART#
1 A25177D
1 A25168DB
VSG 1051 QTY PART#
1 A25177D 1
A25177E
1 A25168DA 1 A25168EB
VSG 1201 VSG 1551
QTY PART# QTY PART#
1
1
A25177E
A25168AE
VSG 1851
QTY PART#
1
1
A25177E
A25225EE
VSG 2101
QTY PART#
Slide Valve Cross Shafts and End Plate
76
Slide Valve Cross Shafts and End Plate
MODEL NUMBER
VSSG 291-601
ITEMDESCRIPTIONQTY VPN
221SHAFT. 2
25843A
222GEAR. 4
25027A
226
RACK CLAMP.
2
25913A
227
RACK CLAMP.
2
25913B
228SPACER. 2
25847A
268
EXPANSION PIN.
4
1193D
269
EXPANSION PIN.
4
2981AA
286
SOCKET HEAD CAP SCREW.
8
2795F
297
SET SCREW
2
2060J
298
SET SCREW
2
2060H
ITEM DESCRIPTION
220
END PLATE
221SHAFT.
222GEAR.
226
RACK CLAMP.
228 SPACER.
267
DOWEL PIN.
268
EXPANSION PIN.
269
EXPANSION PIN.
270
PIPE PLUG.
286
SOCKET HEAD CAP SCREW.
297
SET SCREW
298
SET SCREW
MODEL NUMBER
VSG 751 & VSG 901
VSG 1051 & VSG 1201
QTYVPN
QTY
VPN
1
25543A
1
25593A
2 25844A 2
25845A
4 25027A 4
25027A
4
25913C
4
25913C
4 25033C 4
25033C
2
2868B
2
2868B
4
1193D
4
1193D
4
2981AA
4
2981AA
2
2606E
2
2606E
8
2795F
8
2795F
2
2060J
2
2060J
2
2060H
2
2060H
MODEL NUMBER
ITEM DESCRIPTION
VSG 1551Thru VSG 2101
QTY VPN
220
END PLATE
1
25661A
221SHAFT. 2
25793A
222GEAR. 4
25027A
226
RACK CLAMP.
4
25913C
228SPACER. 4
25033C
267
DOWEL PIN.
2
2868B
268
EXPANSION PIN.
4
1193D
269
EXPANSION PIN.
4
2981AA
270
PIPE PLUG.
2
2606A
286
SOCKET HEAD CAP SCREW.
8
2795F
297
SET SCREW
2
2060J
298
SET SCREW
2
2060H
77
78
Capacity Slide
Volume Slide
Carriage Assembly
Slide Valve Carriage Assembly
Slide Valve Carriage Assembly
MODEL NUMBER-
ITEM DESCRIPTION
VSSG 291 Thru VSSG 601
QTY VPN
300
CARRIAGE ASSEMBLY.
2
A25179B
304
CAPACITY PISTON 340, 341, 350 & 355
2
A25183B
305
VOLUME PISTON 340, 342, 350 & 355
2
A25184B
307
GASKET SET 345B.
2
A25200B
316RACK. 2
25024A
323RACK. 2
25023A
343A COVER, SEPARATE VOL. & CAP.
4
25022A
343B COVER, ONE PIECE CAST.
2
25399A
345A GASKET, SEPARATE VOL. & n/a
CAP COVERS.
4
25021A
345B GASKET, ONE PIECE CAST COVER.
2
25900A
350
PISTON RING SET.
4
2953AA
355
EXPANSION PIN.
4
1193PP
359
PIPE PLUG.
6
2606D
360
LOCK WASHER (PAIR).
4
3004C
361WASHER. 4
13265B
363NUT. 8
2797A
366A HEX HEAD CAP SCREW, SEPARATE
VOL. & CAP COVERS.
24
2796N
366B HEX HEAD CAP SCREW, ONE PIECE
CAST COVER.
24
2796B
79
Slide Valve Carriage Assembly
MODEL NUMBER
ITEM DESCRIPTION
VSG 751
VSG 901
VSG 1051
VSG 1201
QTYVPN
QTYVPN
QTYVPN
QTYVPN
300
CARRIAGE ASSEMBLY.
2A25179C
2A25179C
2A25179D
2A25179D
304
CAPACITY PISTON 340, 341, 350 & 355.
2A25183C
2A25183C
2A25183D
2A25183D
2A25184C
2A25184C
2A25184D
2A25184D
305
VOLUME PISTON 340, 342, 350 & 355.
307
GASKET SET 345B & 378**.
2
A25200C 2
A25200C 2
A25200D 2
A25200D
316
RACK.
225080A
225080A
225080C
225080C
323
RACK.
225080B
225080B
225080D
225080D
340
PISTON.
425076A
425076A
425138A
425138A
341
CAPACITY PISTON SHAFT.
225078A
225078A
225078E
225078E
342
VOLUME PISTON SHAFT.
225078B
225078B
225078F
225078F
343A COVER, SEPARATE VOL. & CAP.
2
25123B
2
25123B
4
25123C
4
25123C
343B
COVER, ONE PIECE CAST.
225279A
225279A
225401A
225401A
344
COVER, SEPARATE VOL. & CAP.
2
25123A
2
25123A
n/a
n/a
n/a
n/a
345A GASKET, SEPARATE VOL. &
CAP COVERS.
225124B
225124B
425124C
425124C
345B GASKET ONE PIECE CAST COVER. 2
25902A
2
25902A
2
25901A
2
25901A
346
GASKET, SEPARATE VOL. & CAP
COVERS.
2 25124A 2 25124A n/an/a
n/an/a
347 PISTON SLEEVE.
2 25079A 2 25079A n/an/a
n/an/a
350
PISTON RING SET.
42953AB
42953AB
42953AC
42953AC
355
EXPANSION PIN.
41193PP
41193PP
41193PP
41193PP
359
PIPE PLUG.
62606D62606D62606E62606E
360
LOCK WASHER (PAIR).
43004C43004C43004C43004C
361
WASHER.
413265B
413265B
413265B
413265B
363
NUT.
82797A82797A82797A82797A
366A
HEX HEAD CAP SCREW.
122796B 122796B 242796B 242796B
366B
HEX HEAD CAP SCREW.
122796P 122796P 242796P 242796P
367
HEX HEAD CAP SCREW.
12
2796BN
12
2796BN
n/a
n/a
n/a
n/a
373
SOCKET HEAD CAP SCREW. 62795N62795N62795P62795P
374
LOCK WASHER (PAIR).
63004C63004C63004D63004D
378 0-RING.
2 2176Y 2 2176Y n/an/a
n/an/a
380 RETAINER RING.
2 2866C 2 2866C n/an/a
n/an/a
80
Slide Valve Carriage Assembly
MODEL NUMBER
ITEM DESCRIPTION
VSG 1551 to 2101
QTYVPN
300
CARRIAGE ASSEMBLY.
2
A25179E
304
CAPACITY PISTON 340, 341, 350 & 3552
A25183E
305
VOLUME PISTON 340, 342, 350 & 3552 A25184E
307
GASKET SET 345 & 378.
2
A25200E
316RACK.
2 25779A
323RACK.
2 25780A
325SHAFT.
2 25778A
340PISTON.
4 25782A
341
CAPACITY PISTON SHAFT.
2
25784A
342
VOLUME PISTON SHAFT.
2
25783A
343BCOVER.
2 25690A
345BGASKET.
2 25384A
347
PISTON SLEEVE.
4
25786A
350
PISTON RING SET.
4
2953AD
355
EXPANSION PIN.
4
1193PP
359
PIPE PLUG.
6
2606E
360
LOCK WASHER (PAIR).
4
3004C
361WASHER.
4 13265B
363NUT.
8 2797A
366B HEX HEAD CAP SCREW.
28
2796BL
373
SOCKET HEAD CAP SCREW.
6
2795AG
374
LOCK WASHER (PAIR).
6
3004D
3780-RING.
4 2176AG
380
RETAINER RING.
4
2755AG
81
Actuator & Command Shaft
82
Actuator & Command Shaft
ITEM
DESCRIPTION
MODEL NUMBER
VSSG 291 thru
VSSG 601
QTY VPN
VSG 751 thru
VSSG 901
VPN
VSG 1051 thru
VSG 1201
VPN
VSG 1551 thru
VSG 2101
VPN
400
COMMAND SHAFT ASSEMBLY2
A25994B
A25994CA25994DA25994E
401
SLIDEVALVE ACUATOR
2
25972D
25972D
25972D
25972D
446
O-RING
2
2176X
2176X
2176X
2176X
83
Miscellaneous Frame Components
VSG Screw Compressor
84
Miscellaneous Frame Components
MODEL NUMBER
ITEM
DESCRIPTION
GASKET AND O-RING KIT; 504
FLANGE SET 513, 514 & 547A.
VSSG 291 thru
VSSG 601
QTYVPN
1
KT710A1
1
A25190A
506
2
ECON-O-MIZER PORT.
512
MANIFOLD GASKET.
513
FLANGE OIL.
513
AFLANGE ECON-O-MIZER.
514
FLANGE GASKET OIL.
514A
FLANGE GASKET ECON‑O‑MIZER.
518
SUCTION FLANGE GASKET.
519
DISCHARGE FLANGE GASKET.
524 COVER.
525 GASKET.
527
INLET SCREEN.
528
ECON-O-MIZER PLUG.
530O-RING
532 O-RING
535
PIPE PLUG 1/4” MPT.
539
PIPE PLUG.
540
DOWEL PIN.
545
HEX HEAD CAP SCREW FOR OIL SUPPLY FLANGE.
545
HEX HEAD CAP SCREW FOR ECON-O-MIZER FLANGE.
547
HEX HEAD CAP SCREW.
552
HEX HEAD CAP SCREW.
552
HEX HEAD CAP SCREW.
553
HEX HEAD CAP SCREW.
650 O-RING.
651 O-RING.
A25190B
1
25503A
1
25058A
2
25058A
1
11323D
2
11323D
1
25199C
1
25199B
n/an/a
n/an/a
n/a
n/a
n/a
n/a
2 2176AB
n/an/a
n/a
n/a
n/a
n/an/an/a
2
2868B
n/a
n/a
2
2796C
n/a
n/a
4
2796C
8
2796C
n/a
n/a
n/a
n/a
n/a
n/a
n/an/a
n/an/a
85
Miscellaneous Frame Components
MODEL NUMBER
ITEM DESCRIPTION
VSG 751
VSG 901
VSG 1051
VSG 1201
QTY VPN
QTY
VPN
QTY
VPN
QTY VPN
GASKET AND O-RING KIT;
1
KT710B
1
KT710B
1
KT710C
1
KT710C
504
FLANGE SET 513, 514 & 547.
1
A25190A
1
A25190A
1
A25190B 1
A25190B
512MANIFOLD GASKET.
1
25541A125541A1 25324A
1
25324A
513FLANGE OIL.
1
25058A125058A1 25058B
1
25058B
514
FLANGE GASKET OIL.
1
11323D
1
11323D
1
11323E
1
11323E
518
SUCTION FLANGE GASKET.
1
25199C
1
25199C
1
25199D
1
25199D
519
DISCHARGE FLANGE GASKET.
1
25199B
1
25199B
1
25199C
1
25199C
526
ORIFICE PLATE.
1
25223CB
1
25223CA
1
25223DB 1
25223DB
529
WAVE SPRING.
1
2912E1
2912E12912E
1
2912E
530
O-RING
2
2176J2
2176J22176J
2
2176J
538
PIPE PLUG 3/4” MPT.
6
2606A
6
2606A
540
DOWEL PIN.
2
2868B2
2868B22868B
2
2868B
547
HEX HEAD CAP SCREW.
21 2796GP
21
2796GP
24
2796GP
24 2796GP
554
HEX HEAD CAP SCREW.
1
2796U
1
2796U
1
2796U
1
2796U
86
Miscellaneous Frame Components
MODEL NUMBER
ITEM DESCRIPTION
VSG 1551 THRU
VSG 2101
QTYVPN
GASKET AND O-RING KIT;
1
KT710D
504 FLANGE SET 513, 514 & 547.
1
A25190C
504 FLANGE SET 513A, 514A & 547
ECON-O-MIZER PORT.
2
A25190D
512 MANIFOLD GASKET.
1
25676A
513 FLANGE OIL.
1
12477C
513A FLANGE ECON-O-MIZER.
514 FLANGE GASKET OIL.
1
11323F
514A FLANGE GASKET ECON-O-MIZER.
518 SUCTION FLANGE GASKET.
1
25199D
519 DISCHARGE FLANGE GASKET.
1
25199C
530O-RING
2 2176J
538 PIPE PLUG 3/4” MPT.
3
2606A
540 DOWEL PIN.
2
2868K
542 PIPE PLUG 3/4” MPT.
1
13163F
545 HEX HEAD CAP SCREW FOR
OIL SUPPLY FLANGE.
4
11397E
NOTE:*Not pictured
**For VSS 1801 Serial Numbers 819, 820 & 821 only.
87
88
1551
291
Replacement Tools
Replacement Tools
MODEL NUMBER
ITEM DESCRIPTION
900
GATEROTOR TOOLS (901, 910, 911,
912, 913, 914, 915, 916 & 917).
901
GATEROTOR STABILIZER SET
(901A, 901B & 901C).
VSSG 291 thru
VSSG 601
QTYVPN
ITEM DESCRIPTION
900
GATEROTOR TOOLS (901, 910, 911,
912, 913, 914, 915, 916 & 917).
901
GATEROTOR STABILIZER SET
(901A, 901B & 901C).
1
A25205B
1
A25698A
MODEL NUMBER
VSG 751
VSG 901
QTYVPN
QTYVPN
VSG 1051
QTYVPN
VSG 1201
QTYVPN
1
A25205C
1
A25205C
1
A25205C
1
A25205C
1
A25698A
1
A25698A
1
A25698A
1
A25698A
89
Replacement Tools
ITEM DESCRIPTION
900
GATEROTOR TOOLS (901, 910, 911,
912, 913, 914, 915, 916 & 917).
901
GATEROTOR STABILIZER SET
(901A, 901B, 901C & 901D).
90
MODEL NUMBER
VSG 1551 thru
VSG 2101
QTYVPN
1
A25205E
1
A25699A
VSG 301-701 Replacement Parts Section
Recommended
Spare Parts List
Refer to the Custom Manual
Spare Parts Section for Specific Applications
Please have your Model # and Sales Order # available when ordering.
These are found on the compressor’s Name Plate.
91
Gaterotor Assembly
92
Gaterotor Assembly
Part totals indicated are for one gate rotor assembly, machines with two gate rotors will require
double the components listed below.
ITEM DESCRIPTION
100
SUPPORT ASSEMBLY 110 & 135B.
101
GATE ROTOR & DAMPER ASSEMBLY
111,120.
102
GATE ROTOR SUPPORT ASSEMBLY
100, 101, 119 & 130.
SHIM PACK SET (2) 121, (2) 122,
(1) 123, (1) 124.
110SUPPORT.
111GATE ROTOR.
114SNAP RING.
115RETAINER BALL BEARING
118
GATE ROTOR COVER GASKET.
119WASHER WAVE SPRING.
120
DAMPER.
121*
SHIM 0.002”.
122*
SHIM 0.003”.
123*
SHIM 0.005”.
124*
SHIM 0.010”.
125
ROLLER BEARING.
126
BALL BEARING.
130
RETAINING RING.
131
RETAINING RING.
132
RETAINING RING.
135
DOWEL PIN
141
O-RING ROLLER BRG HSG.
143
O-RING BALL BRG SUPPORT.
155SHIM
156SHIM
MODEL NUMBER
VSG 301
VSG 361
VSG 401
QTYVPN
QTYVPN
QTYVPN
1
A25222AB 1
A25222AA 1
A25222AC
1A25160AB
1A25160AA A25160AC
1
A25161AB 1
A25161AA
A25161AC
1
A25165A 1
A25165A
A25165A
125723D
125723C
125723B
125718B
125718C
125718D
12867L12867L12867L
125935A
125935A
125935A
1
25259B
1
25259B
1
25259B
13203A13203A13203A
125760A
125760A
125760A
ar25921AA
ar25921AA
ar25921AA
ar25921AB
ar25921AB
ar25921AB
ar25921AC
ar25921AC
ar25921AC
ar25921AD
ar25921AD
ar25921AD
12864F12864F12864F
22865L22865L22865L
12866H12866H12866H
12867S12867S12867S
12866J12866J12866J
125910A
125910A
125910A
1
2176L
1
2176L
1
2176L
1
2176F
1
2176F
1
2176F
ar25977Dar25977Dar25977D
ar25977Car25977Car25977C
ar = As required
93
Gaterotor Assembly
Part totals indicated are for one gate rotor assembly, dual gate machines will require double the components.
ITEM DESCRIPTION
100
SUPPORT ASSEMBLY 110 & 135B.
101
GATE ROTOR & DAMPER ASSEMBLY
111,120.
102
GATE ROTOR SUPPORT ASSEMBLY
100, 101, 119 & 130.
SHIM PACK SET (2) 121, (2) 122,
(1) 123, (1) 124.
110SUPPORT.
111GATE ROTOR.
114SNAP RING.
115RETAINER BALL BEARING
118
GATE ROTOR COVER GASKET.
119WASHER.
120
DAMPER.
121*
SHIM 0.002”.
122*
SHIM 0.003”.
123*
SHIM 0.005”.
124*
SHIM 0.010”.
125
ROLLER BEARING.
126
BALL BEARING.
130
RETAINING RING.
131
RETAINING RING.
132
RETAINING RING.
135
DOWEL PIN
141
O-RING ROLLER BRG HSG.
143
O-RING BALL BRG SUPPORT.
155SHIM
156SHIM
NOTE:
94
*
Not pictured
ar = As Required
MODEL NUMBER
VSG 501
VSG 601
VSG 701
QTYVPN
QTYVPN
QTYVPN
1
A26011BB 1
A26011BA 1
A26011BA
1A26002BB
1A26002BA
1A26002BC
1
A26003BB 1
A26003BA 1
A26003BC
1
A26035B 1
A26035B 1
A26035B
126030BB
126030BA
126030BA
126032A
126031A
126033A
12867U12867U12867U
125935B
125935B
125935B
1
25259C
1
25259C
1
25259C
125007A
125007A
125007A
125760A
125760A
125760A
ar26027AA
ar26027AA
ar26027AA
ar26027AB
ar26027AB
ar26027AB
ar26027AC
ar26027AC
ar26027AC
ar26027AD
ar26027AD
ar26027AD
12864B12864B12864B
12865B12865B12865B
12866A12866A12866A
12867A12867A12867A
12866K12866K12866K
125910A
125910A
125910A
1
2176M
1
2176M
1
2176M
1
2176R
1
2176R
1
2176R
ar25977Gar25977Gar25977G
ar25977Har25977Har25977H
Shaft Seal
MODEL NUMBER
ITEM DESCRIPTION
ALL VSG 301-401
ALL VSG 501-701
QTY
VPNQTY
VPN
*
SHAFT SEAL KIT Viton Kit
219, 230, & 260.
1KT709DG 1KT709AG
219
SHAFT SEAL. 1A 1A
230
OIL SEAL. 12930C 125040A
244-
TEFLON SEAL 125939A 125939A
252-
RETAINER RING 12928M 12928M
260
O-RING1
2176U1
2176F
261
O-RING.
(205 Only)
1
2176AEn/a
NOTE *
A
-
Not pictured.
Sold only as kit.
See recommended spare parts lists for complete assembly.
95
Main Rotor, Slide Valve Cross Shafts & End Plate
Models VSG301-401 Counter Clockwise ONLY
96
Main Rotor, Slide Valve Cross Shafts & End Plate
Models VSG301-401 Counter Clockwise ONLY
ITEM DESCRIPTION
201
MAIN ROTOR ASSEMBLY. 203
OIL BAFFLE ASSEMBLY (1)
217, (1) 244, (1) 248, (1) 249, (1) 252.
SHIM ASSORTMENT (2) 240,
(2) 241, (1) 242, (1) 243
217
OIL BAFFLE PLATE .
220
END PLATE.
221
SHAFT.
222
GEAR.
227
CLAMP.
228
SPACER.
240
SHIM 0.002”
241
SHIM 0.003”
242
SHIM 0.005”
243
SHIM 0.010”
244
TEFLON RING.
248
CHECK VALVE.
249
CHECK VALVE.
252
RETAINING RING
268
EXPANSION PIN.
269
EXPANSION PIN.
271**
PLUG SOLID
281
HEX HEAD CAP SCREW.
286
SOCKET HEAD CAP SCREW.
297
SET SCREW.
298
SET SCREW.
NOTE:
*
**
A
MODEL NUMBER
VSG 301
VSG 361
VSG 401
QTYVPN
QTYVPN
QTYVPN
1A25226AB
1A25226AA
1A25226AC
1
A25942AA 1
A25942AA 1
A25942AA
1
A25177A 1
A25177A 1
A25177A
1
25938A
1
25938A
1
25938A
125719D
125719D
125719D
225941A
225941A
225941A
425027A
425027A
425027A
425913A
425913A
425913A
425847A
425847A
425847A
A25409AA
A25409AA
A25409AA
A25409AB
A25409AB
A25409AB
A25409AC
A25409AC
A25409AC
A25409AD
A25409AD
A25409AD
125939A
125939A
125939A
13120A13120A13120A
13120B13120B13120B
12829M12829M12829M
41193D41193D41193D
42981AA
42981AA
42981AA
125422A
125422A
125422A
6
2796N
6
2796N
6
2796N
8
2795F
8
2795F
8
2795F
22060J22060J22060J
22060H22060H22060H
Not pictured.
Required at top locate single gaterotor only.
As required.
97
Main Rotor, Slide Valve Cross Shafts & End Plate
Models VSG501-701 Clockwise ONLY
98
Main Rotor, Slide Valve Cross Shafts & End Plate
Models VSG501-701 Clockwise ONLY
ITEM DESCRIPTION
201
MAIN ROTOR ASSEMBLY. 203
OIL BAFFLE ASSEMBLY (1) 217,
(1) 244, (1) 248, (1) 249, (1) 252.
SHIM ASSORTMENT (2) 240,
(2) 241, (1) 242, (1) 243
220
END PLATE.
221
SHAFT.
222
GEAR.
228
SPACER.
240
SHIM 0.002”
241
SHIM 0.003”
242
SHIM 0.005”
243
SHIM 0.010”
244
TEFLON RING.
248
CHECK VALVE.
249
CHECK VALVE.
252
RETAINING RING
255
WASHER
256
WASHER
268
EXPANSION PIN.
269
EXPANSION PIN.
281
HEX HEAD CAP SCREW.
282
SOCKET HEAD CAP SCREW
297
SET SCREW.
298
SET SCREW.
NOTE:
*
A
MODEL NUMBER
VSG 501
VSG 601
VSG 701
QTYVPN
QTYVPN
QTYVPN
1A26010BB
1A26010BA
1A26010BC
1
A26034B
1
A26034B
1
A26034B
1
A25177B 1
A25177B 1
A25177B
126025B
126025B
126025B
225843A
225843A
225843A
425027A
425027A
425027A
425847A
425847A
425847A
A25255AA
A25255AA
A25255AA
A25255AB
A25255AB
A25255AB
A25255AC
A25255AC
A25255AC
A25255AD
A25255AD
A25255AD
125929B
125929B
125929B
13120A13120A13120A
13120B13120B13120B
12928N12928N12928N
225977E
225977E
225977E
225977F
225977F
225977F
41193D41193D41193D
42981AA
42981AA
42981AA
8
2796B
8
2796B
8
2796B
2
2795D
2
2795D
2
2795D
22060J22060J22060J
22060H22060H22060H
Not pictured.
As required.
99
100
Assembly Includes Carriage and Slides.
Carriage Assembly
Capacity Slide
Volume Ratio
Slide Valve Carriage Assembly
Slide Valve Carriage Assembly
MODEL NUMBER
ITEM DESCRIPTION
ALL VSG 301-401 ALL VSG 501-701
QTYVPN
QTYVPN
300CARRIAGE ASSEMBLY.
1A25179A
1A26012B
304
CAPACITY PISTON 340, 341, 350 & 355.
1A25183A
1A25183B
305
VOLUME PISTON 340, 342, 350 & 355.
1A25184A
1A25184B
316CAPACITY RACK.
125023D
125024A
318
CAPACITY RACK SHAFT.
1
25772C
1
25772A
323
VOLUME RATIO RACK.
1
25023C
1
25023A
325
VOLUME RATIO RACK SHAFT.
1
25772D
1
25772B
350
PISTON RING SET.
2
2953AE
2
2953AA
360
LOCK WASHER (PAIR).
2
3004C
2
3004C
361WASHER.
213265B213265B
363NUT.
42797A 42797A
372*
SOCKET HEAD CAP SCREW.
N/A
1
2795M
Notes:There are two slide valve carriages per compressor. Each one each has its
own Volume Ratio and Capacity slide valves. The above totals are per side of the
compressor, double the quantities if both slide valve carriages are being worked
on.
*.Not Pictured.
101
Actuator & Command Shaft
102
Actuator & Command Shaft
ITEM
DESCRIPTION
MODEL NUMBER
VSSG 291 thru
VSSG 601
QTY VPN
VSG 751 thru
VSSG 901
VPN
VSG 1051 thru
VSG 1201
VPN
VSG 1551 thru
VSG 2101
VPN
400
COMMAND SHAFT ASSEMBLY2
A25994B
A25994CA25994DA25994E
401
SLIDEVALVE ACUATOR
2
25972D
25972D
25972D
25972D
446
O-RING
2
2176X
2176X
2176X
2176X
103
Miscellaneous Frame Components
Model VSG 301-401
Model VSG 501-701
104
Miscellaneous Frame Components
ITEM DESCRIPTION
512MANIFOLD GASKET
514ECON-O-MIZER GASKET
522
COUPLING LOCK PLATE
523
LOCK WASHER
528ECON-O-MIZER PLUG
530 O-RING
540DOWEL PIN
542
PIPE PLUG
551
HEX HEAD CAP SCREW
570
BEARING OIL PLUG
571 PLUG
572 SPRING
Notes*.
MODEL NUMBER
ALL VSG 301-401 ALL VSG 501 - 701
QTYVPN
QTYVPN
125737A126037A
211323GG
211323D
n/a
1
25004D
n/a
1
3004H
225419A225397K
n/a
2 2176BF
22868B22868B
3
2606C
10
2606B
n/a
2
2796C
1
25978A
n/a
1 25979A n/a
1 3148A n/a
Not Pictured
105
Housing Accessories
Miscellaneous Frame Components
106
Miscellaneous Frame Components
Housing Accessories
ITEM DESCRIPTION
117
GATE ROTOR COVER.
118
COVER GASKET.
129GASKET.
180
INLET SCREEN.
343
PISTON COVER. *
MODEL NUMBER
VSG 301 - 701
QTYVPN
1
25416B
2
25259B
1
11323T
1
25920A
1
25724B
ITEM DESCRIPTION
MODEL NUMBER
VSG 301 - 401
VSG 501 - 701
QTYVPN
QTYVPN
345O-RING.
346O-RING.
42176BX
42176CA
22176BG
22176BG
107
Replacement Tools
ITEM DESCRIPTION
901GATEROTOR STABILIZER.
902SEAL INSTALLATION TOOL
108
MODEL NUMBER
ALL VSG 301-401 ALL VSG 501-701
QTYVPN
QTYVPN
125742A125742B
125455A125455B
Pre Start Up for Proper Oil Separator Level and to Prime the Cooler
WARNING
Shows the Flow for Priming the Oil Cooler (Steps 1-5)
Shows the Flow for Priming the Compressor Prior to
Start Up (Steps 6-11)
Failure to Follow These Steps Will
Result in Bearing Damage and Compressor Seizing and Will Void Any and
All Warranties That May Apply.
Strainer
Suction
Gas
Stop
Valve
Discharge
Gas
Single Screw
Compressor
Check
Valve
Shipped Loose
Follow the Steps Below:
Gas & Oil Separator
1
1
Verify Oil is in Separator
Drain
H
Note: Bottom Site Glass Should Be Full.
2a
Manually Shut Off Valve to Oil Filter
Manually Close 2a
3
Manually Open Valve
4
Run Oil Pump for a minimum
of 5 Minutes and as long as
needed to purge all gas from
oil cooler and piping
5
Shut Oil Pump Off
6
Open Valve to Oil Filter
7
Stop
Valve
Metering Valve
Close Valve #3
Filter
2
SG
Temp
Control
Valve
2
Oil
Pump
Check
Valve
6
3
7
Very Important: Piping of the oil must
enter the bottom connection of the oil
cooler and leave the top connection.
Oil Heater
Strainer
Remote
Air Cooled
Oil Cooler
2a
Ball Valve
8
Run Pump Two Times for Only 1-2 Minutes
9
Shut Off Oil Pump and Wait an Additional
5 Minutes
10
Repeat Steps 2-9 Until Oil Separator is at Proper
Oil Level and Oil Cooler is Primed
11
The Oil Cooler is Considered Primed When
the Oil Level (Separator) is Constant
11a
Open Valve 2a
12
Increase Pre-Lube Time to 10 Seconds
See Section: On Set Points In Compact Logix Manual.
13
Proceed to Start-Up
See Section: On Start Up Check List In Manual.
IMPORTANT! FOR REMOTE OIL COOLERS ONLY. READ BEFORE PROCEEDING.
Remote Coolers Only
109
EmersonClimate.com
Vilter Manufacturing LLC
P.O. Box 8904
Cudahy, WI. 53110-8904
P: 414-744-0111
F: 414-744-1769
www.vilter.com
110
(6/2011) Emerson and Vilter are trademarks of Emerson Electric Co. or one of its affi liated companies.
©2011 Emerson Climate Technoligies, Inc. All rights reserved. Printed in the USA.
35391SSG Rev. 08