Vilter VSG Single Screw Bare Shaft Compressor, VSSG Single Screw Bare Shaft Compressor Compressor User Manual

VSG & VSSG

Single Screw Bare Shaft Compressor

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: [email protected]

Equipment Identification Numbers:

Vilter Order Number: _______________________Compressor Serial Number: _________________

Vilter Order Number: _______________________Compressor Serial Number: _________________

Vilter Order Number: _______________________Compressor Serial Number: _________________

Vilter Order 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

Critical Applications Guidelines ........................................................................... 8

Instrumentation Requirements ...................................................................... 9

Alarm and Shutdown Readings ..................................................................... 11

VSG Package Requirements .............................................................................. 12

Description .................................................................................................. 13

installation ................................................................................................... 16

Installation & Calibration of Slide Valve Actuators ............................................. 18

Slide Valve Operation ................................................................................... 21

Slide Valve Actuator Trouble Shooting Guide ................................................ 22

Operation Section ............................................................................................ 26

Notice on using Non -Vilter Oils .................................................................... 26

Maintenance ................................................................................................ 29

Service ............................................................................................................. 30

Parts Section .................................................................................................... 57

Gate Rotor ................................................................................................... 58

Shaft Seal ..................................................................................................... 62

Tandem Shaft Seal ........................................................................................ 63

Main Rotor ................................................................................................... 64

Slide Valve Cross Shafts and End Plate .......................................................... 66

Slide Valve Carriage Assembly ...................................................................... 68

Actuator & Command Shaft ......................................................................... 72

Miscellaneous Frame Components ............................................................... 74

Replacement Tools ....................................................................................... 78

VSG 301-701 Replacement Parts Section .......................................................... 81

Gaterotor Assembly ..................................................................................... 82

Shaft Seal ..................................................................................................... 85

Main Rotor, Slide Valve Cross Shafts & End Plate ........................................... 86

Slide Valve Carriage Assembly ...................................................................... 90

Actuator & Command Shaft ......................................................................... 92

Miscellaneous Frame Components ............................................................... 94

Replacement Tools ....................................................................................... 98

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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.

Long Term Storage Requirements

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Note: At the time of purchase Vilter Manufacturing must be notified.

The compressor(s) must be stored in a heated building, preferably air conditioned to control moisture, to prevent corrosion of the main rotor shaft and for the compressor. The slide valve

(volume ratio& capacity) motors and gears.

The main rotor shaft must be coated with light grease to prevent rusting.

(For Screw Compressors) The volume and capacity slide valve motor enclosures should have corrosion inhibitors installed in them and the enclosures should be sealed. On a six month basis

(depending on relative humidity), check and replace inhibitors as necessary, and check for signs of corrosion.

Before leaving Vilter Manufacturing the compressor is evacuated and pressurized, with dry nitrogen, to 5 psig. Pressure must be monitored with the gauge (provided by Vilter) and checked on a regular basis (at least monthly).

The rotor shaft must be rotated every 3 months to prevent flat spots from developing on the bearing surfaces and to keep the shaft seal lubricated.

A log should be maintained indicating that the above procedures have been completed.

B.

C.

When the compressor is installed.

A. Look into the suction and discharge connections and inspect for any signs of corrosion on parts.

Prelube the compressor with the main oil pump and rotate by hand several revolutions prior to start.

Notify the Vilter Warranty Department when the compressor is started.

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Critical Applications Guidelines

To ensure the successful operation of the VSG compressor, the guidelines described below should be followed.

1. Proper lubrication is critical to the operation of the VSG compressor. The compressor relies on the injected oil to absorb and remove the heat of compression, to seal the compression chambers formed in the flutes of the screw, and to lubricate all moving parts. For this reason, it is imperative that the oil chosen be of correct viscosity, and that sufficient oil flow be provided at all times, using an auxiliary oil pump when necessary. The oil chosen must be compatible with the process gas as well, to prevent absorption of the gas into the oil, which would dilute the oil and reduce the viscosity. Also, oil filtration to 25 micron nominal particle size is required to ensure that only clean oil is injected into the compressor. For assistance in choosing the correct oil for the application and in sizing an auxiliary oil pump, consult a Vilter representative.

2. Injection oil temperature must be closely controlled for optimum performance. Oil temperature must be maintained a minimum of 15 - 20°F above the gas mixture dewpoint at anytime to prevent condensation or liquid knockout from occurring within the compressor.

Gas composition plays a role in the performance of the VSG compressor as well. While the VSG is capable of handling a wide variety of gases, it is required that the concentration of H

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S in the process gas not exceed 100 PPM. If H

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S is present in the process gas in any concentration, special oil additives are required to protect the compressor from corrosion.

Notice on using Non -Vilter Oils

Oil and its additives are crucial in refrigeration 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, as we can with our own lubricants.

We realize that customers may choose compressor 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 refrigeration 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 refrigeration 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 compressor lubricants.

Instrumentation Requirements

Pressure

There are four pressure transducers required to read system pressures as listed below.

1. Suction pressure transducer (-15.0 - 300 PSIG) measures the gas suction pressure into the compressor housing, which provides the permissive to start for minimum suction pressure, and is used for annunciation of low suction pressure while running and in the capacity control logic.

2. Discharge pressure transducer (-15.0 - 300 PSIG) measures the discharge pressure of the process gas in the separator, which provides annunciation for high discharge pressure, and may also be used for capacity control logic.

3. Oil Filter Inlet pressure transducer (-15.0 - 300

PSIG) measures the oil pressure as it enters the oil filter canisters and is used to calculate oil filter differential pressure to provide annunciation of high filter differential pressure

4. Oil Manifold pressure transducer (-15.0 - 300

PSIG) measures the oil pressure downstream of the oil filter as the oil is injected into the compressor, and provides annunciation protection for low prelube oil pressure, and low running oil injection pressure.

Additional pressure transducers may be required and installed by the customer for pressure readings at customer specified points such as process gas discharge pressure from the package boundary, cooling water pressure to and/or from the oil cooler, etc.

Temperature

There are four temperature readings required for processor control, as listed below.

5. Suction temperature RTD measures the temperature of the incoming suction gas, and is used to provide annunciation for low suction temperature when the unit is running.

6. Discharge temperature RTD measures the temperature of the gas/oil mixture as it is discharged from the compressor housing, and provides annunciation for high running discharge temperature.

7. Oil Separator temperature RTD measures the temperature of the oil in the separator sump, and gives the oil temperature start permissive and low running separator temperature annunciation.

8. Oil Injection temperature RTD measures the temperature of the oil as it is injected into the compressor, which provides annunciation for either high or low running oil injection temperature.

* Additional RTD’s may be required and installed by the customer for temperature readings at customer specified points such as discharge gas temperature from the package boundary, cooling water temperature to and/or from the oil cooler, gas aftercooler temperature, etc.

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Instrumentation Requirements

MOTOR

COMPRESSOR

OIL SEPARATOR

STANDARD SINGLE

OIL FILTER

OPTIONAL DUAL OIL FILTERS

OIL COOLER

STANDARD WATER COOLED OIL COOLER

OPTIONAL REMOTE AIR COOLED OIL COOLER

Miscellaneous: Additional instrumentation devices required are a current transformer mounted around one phase of the drive motor leads to measure main motor amperage, and two rotary potentiometers to read the position of the slides. The amperage signal provides annunciation for high motor amperage, and is used in the capacity control logic. The rotary potentiometers indicate the position of the slides, which is used as a starting permissive and in the capacity control logic. Also, additional input points may be required for customer connection of remote signals such as Start and Stop commands, and capacity setpoint control.

Alarm and Shutdown Readings

The control system for the VSG compressor must protect the machine from damage caused by running outside of normal operating conditions by providing operators with alarms when operating parameters have reached an abnormal condition, and by automatically stopping the compressor before these conditions can cause a unit failure. Pressures and temperatures of the process gas and the oil, as well as motor amperage and slide positions must all be continuously monitored to ensure the compressor is operating properly.

1. Low Gas Suction Temperature - This point protects the compressor from suction gas entering the compressor at too low of a temperature, and is activated by a direct reading from the suction temperature

RTD located in the suction “T”.

2. High Gas Discharge Temperature - This point protects the compressor against high gas temperature at the discharge of the unit, and is activated by a direct reading from the RTD located in the compressor discharge manifold.

3. Low Oil Separator Start Temperature - This point protects the compressor from starting with low oil temperature in the separator, and is activated by a direct reading from the RTD located in the bottom of the oil separator.

4. Low Oil Separator Run Temperature - Similar to the Low Oil Separator Start Temperature described above, however this point only becomes active after a predetermined period of running time, and uses a higher setpoint.

5. Low Oil Injection Temperature - This point protects the compressor from running with cold oil being injected into the screw housing, and is activated by a direct reading from the RTD located in the oil injection line. This point is bypassed for a predetermined period of time after starting to allow the unit time to start and warm up.

6. High Oil Injection Temperature - This point protects the compressor from running with hot oil being injected into the screw housing, and is activated by a direct reading from the RTD located in the oil injection line.

7. Low Suction Pressure - This point protects the compressor from drawing low suction pressure and is activated by a direct reading from the suction pressure transducer, which reads the pressure from a tap located in the suction stop/check valve housing.

8. High Discharge Pressure - This point protects the compressor from developing high discharge pressure and is activated by a direct reading from the discharge pressure transducer, which reads the pressure from a tap located in the oil separator. In addition to this alarm and shutdown, the compressor package is ultimately protected from damage due to over pressurization by at least one discharge pressure relief valve located on the oil separator. The purpose of this safety setpoint is to allow for a lower setpoint to conform to a process requirement, and to prevent the relief valve from opening.

9. Prelube Oil Pressure - This point acts as a permissive to start the compressor, and protects against the compressor starting with no oil lubrication. If, during a start sequence, the prelube oil pressure fails to rise above 4.0 PSID, the compressor will fail to start. The prelube oil pressure is a calculated value obtained by subtracting the discharge pressure reading from the oil manifold pressure (oil filter outlet pressure) reading.

10. Low Oil Pressure - This point protects the compressor from running with insufficient lubrication pressure, and becomes active after a predetermined period of running, usually sixty seconds. The oil pressure is a calculated value obtained by subtracting the suction pressure from the oil manifold pressure (oil filter outlet pressure) reading, which results in the actual pressure under which the oil is entering the screw housing.

11. High Running Oil Filter Differential Pressure - This point alerts operators to clogging oil filters. When the oil filters develop a high differential pressure while running at normal operating temperatures, it is an indication that they are becoming dirty and must be changed. An alarm initially warns of dirty filters; if the situation worsens before the filters are changed a shutdown will stop the compressor.

In most cases, the safety setpoints described above will have settings which are dictated by process requirements, and not necessarily mechanical constraints of the compressor. Process pressures and temperatures may vary considerably depending on the application of the compressor, and the VSG compressor is designed to work well in a broad range of applications.. For this reason, it is impractical to suggest “initial” setpoints to fit all applications.

Instead, minimum and maximum values for each safety setpoint are provided, while precise settings for the safety setpoints must be derived for each installation.

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VSG Package Requirements

Process Gas Circuit

1. Suction Gas Stop/Check Valve - The VSG compressor requires a manually operated stop valve on the suction line to the compressor to allow for isolating the compressor package from process gas. Also, a check valve is required in the suction line to limit reverse rotation of the compressor on shutdown.

2. Suction Line Strainer - Vilter strongly recommends the use of an inline suction gas strainer to protect the VSG compressor from foreign material which may enter the compressor with the suction gas. This strainer is generally of stainless steel mesh construction. Vilter can provide assistance in designing a strainer housing specifically suited to VSG applications.

3. Process Gas/Oil Separator - A separator vessel capable of removing the oil from the discharge gas stream with an efficiency down to at least 5 PPM oil carryover is required. Vilter’s own available horizontal separator is an

ASME-coded vessel which uses five stages of separation to achieve an oil loss of as little as 3 to 4 PPM.

4. Discharge Gas Relief Valve - To protect the compressor package from damage due to over pressurization, a relief valve must be installed inside of any discharge line hand block valves. The relief valve must be set to open at a pressure lower than the Maximum Allowable Working

Pressure (MAWP) of the separator.

5. Oil Prelube Pump - Usually a direct driven gear type pump, the oil pump is required to prelube the compressor prior to starting and to maintain oil pressure during any periods of low compression ratio operation.

6. Oil Cooler/ Temperature Control Valve - An oil cooler, either air or water cooled, must be used to remove the heat of compression from the oil stream. A temperature control valve is used to maintain constant oil injection temperature to the compressor.

7. Oil Filtration - Large capacity micronic oil filters are required to filter the oil before injection into the VSG compressor. Filtration down to 25 microns nominal or less is generally acceptable. Dual filters are recommended to allow replacement of one cartridge while the compressor continues running with the other cartridge in service.

8. Oil Heater - An oil heater is generally required and must be sized to maintain oil temperature of at least

90°F when the compressor is not running. For outdoor installations, low ambient temperatures and winds must be considered when sizing the oil heater. Also, insulating the separator and oil piping may be required in low temperature ambient conditions.

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Note - Because the oil system on the VSG compressor utilizes discharge gas pressure as the means to move the injection oil through the system, it must be remembered that all components of the oil system are exposed to full discharge pressure and must be pressure rated accordingly.

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 teeth 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 VSG 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

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discharge manifold of the compressor. From the discharge manifold, the gas/oil exits the compressor housing

The Vilter VSG 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

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Description 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.

Description

DESCRIPTION OF GAS SYSTEM FOR A STANDARD

COMPRESSOR SET

The gas passes through a stop valve and a check valve and then through a mesh strainer mounted directly to the inlet flange. The check valve is necessary to prevent reverse rotation and potential damage or oil loss at shut down. The suction gas enters the compressor housing through the top inlet flange, at the driven end of the unit.

After compression the gas is discharged from the discharge manifold directly into a oil separator tank.

On the discharge of the oil separator tank another check valve is positioned to prevent the entry of gas or liquid refrigerant in to the separator when the compressor is shut down. The separator should be allowed to equalize slowly to suction pressure through a small bypass line around the suction check or combination stop/check valve. This will allow the compressor to start without a pressure differential across it, reducing the starting power requirements.

From the discharge manifold, the gas/oil exits the compressor housing and passes into the oil separator through a pipe elbow. The separator vessel serves to separate the oil from the gas as the gas stream moves from one end of the separator to the other. The majority of the oil is separated from the gas in the primary chamber of the vessel due to changes in direction and velocity reduction. Any remaining oil mist is separated from the gas stream as the stream passes through the coalescing elements and into the secondary chamber of the vessel. The gas at discharge pressure then exits at the far end of the separator.

Oil collected in the bottom of the separator is drained off to be recirculated in the oil injection system. The injection oil temperature is controlled by several means the first of which is a three-way mixing valve, which mixes hot oil directly from the separator with oil which has passed through the oil cooler to obtain oil at the desired temperature.

This oil then passes through a filter to remove any contaminants, which may have been picked up from the process gas, and is injected back into the compressor.

DESCRIPTION OF OIL SYSTEM FOR A STANDARD

COMPRESSOR SET

At start oil at is drawn from the oil separator tank by the oil pump, and passes through a oil cooler and micronic filters to the oil supply inlet on the compressor frame.

From there it internally lubricates all points internal to the compressor. After start-up when the compressor develops sufficient differential pressure the oil pump can be shut down and the oiling can take place without the use of the oil pump. On units with low pressure differentials such as booster and low pressure differential high stage compressors, the oil pump must remain on whenever the unit is running to maintain sufficient oil flow.

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Installation

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PIPING

Before installing piping, the compressor inlet and outlet ports should be inspected to ensure no dirt is present.

Piping should be supported so that no piping loads are transmitted to the compressor casings.

All piping should be inspected for cleanliness before installation. As each pipe is connected to the compressor, the coupling alignment should be checked to ensure that no alteration has taken place.

If alignment has altered, the compressor is being strained and the piping supports must be adjusted.

It is not sufficient merely to re-align the drive coupling, as this will not correct the cause of the strain.

Compressors must have an inlet strainer permanently fitted to the compressor inlet.

Care must be taken to avoid trapping the lines except for specific purposes. When traps are used, the horizontal dimensions should be as short as possible to avoid excessive oil trapping.

Steel pipe is generally used in large installations when joints are welded.

In making up joints for steel pipe, the following procedures should be followed:

For threaded connections, all threads on the pipe and fitting should be carefully cleaned to remove all traces of grease or oil. Threads should then be wiped dry with a lintless cloth. Only thread filling compounds suitable for service should be used for making steel pipe joints. These compounds should be used sparingly, and on the pipe only. Do not put any on the first two threads to prevent any of the thread sealing compound from entering the piping system. Acetylene or arc welding is frequently used in making steel pipe joints, however, only a skilled welder should attempt this kind of work. Take care to see no foreign materials are left in the pipes and remove all burrs formed when cutting pipe.

For halocarbon piping, only wrought copper fittings should be used. Cast fittings as used for water service are porous and will allow the refrigerant to escape. Note this exception: In larger pipe sizes, wrought fittings are not available. However, specially tested cast fittings are available and these may be used with complete safety.

It is important to avoid short, rigid pipe lines that do not allow any degree of flexibility. This must be done to prevent vibration being transmitted through the pipe lines to the buildings. One method of providing the needed flexibility to absorb the vibration is to provide long lines that are broken by 90° Ells in three directions.

A second method would be to install flexible pipe couplings as close to the compressor unit as possible with connections run in two different directions,

90° apart. These flexible connections should be installed on both the high and low side lines of the compressor unit.

Hangers and supports for coils and pipe lines should receive careful attention. During prolonged operation of the coils, they may become coated with ice and frost, adding extra weight to the coil. The hangers must have ample strength and be securely anchored to withstand the vibration from the compressor and adequately support the pipe lines.

This information is taken from and ANSI B31.3. The installing contractor should be thoroughly familiar with these codes, as well as any local codes.

Installation

TESTING SYSTEM

FOR LEAKS

Vilter equipment is tested for leaks at the factory.

One the most important steps in putting the system into operation is field testing for leaks. This must be done to assure a tight system that will operate without any appreciable loss of gas.

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.

HYDROCARBON SYSTEMS

“Oil pumped” dry nitrogen, or anhydrous CO pressure to the proper level for testing.

2

in this order of preference may be used to raise the

When the proper pressure is attained, test for leaks with the soap mixture previously described. After all leaks are found and marked, relieve the system pressure and repair the leaks. Never attempt to repair soldered or welded joints while the system is under pressure. Soldered joints should be opened and re soldered.

Do not simply add more solder to the leaking

joint. After all the joints have been repaired and the system is considered “tight”.

Remove the drum and bring the pressure to the recommended test level with oil pumped dry nitrogen or CO

2

. Then check the entire system again for leaks, using a halide torch or electronic leak detector.

Be sure to check all flanged, welded, screwed and soldered joints, all gasketed joints, and all parting lines on castings. If any leaks are found, they must be repaired and rechecked before the system can be considered tight again, remembering that no repair should be made to welded or soldered joins while the system is under pressure.

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 specific lubricating oils. Use of oil not specified or supplied by Vilter will void the compressor warranty.

17

Installation & Calibration of Slide Valve Actuators

18

Slide Valve Actuator Installation Instructions

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.

3. 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.

Installation & Calibration of 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 as 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.

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.

19

20

Installation & Calibration of 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.

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

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.

21

Slide Valve Actuator Trouble Shooting Guide

Problem Reason Solution

The actuator cannot be calibrated

Dirt or debris is blocking one or both optocoupler slots

The photochopper fence extends less than about half way into the optocoupler slots

Clean the optocoupler slots with a Q-Tip and rubbing alcohol.

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 Tape the end of the white wire in the panel and make sure that it cannot touch metal

Dirt and/or condensation on the position sensor boards are causing it to malfunction

Clean the boards with an electronics cleaner or compressed air.

Try to free the stuck button. The calibrate button is stuck down

The position sensor has failed

Push button is being held down for more that ¾ second when going through the calibration procedure

The actuator goes into calibration mode spontaneously

The actuator goes into calibration mode every time power is restored after a power loss

The white calibrate wire in the grey

Turck cable is grounding intermittently

A very strong source of electromagnetic interference (EMI), such as a contactor, is in the vicinity of the actuator or grey cable

There is an intermittent failure of the position sensor

The motor brake is not working properly (see theory section above.)

Replace the actuator.

Depress the button quickly and then let go. Each ¾ second the button is held down counts as another press.

Tape the end of the white wire in the panel and make sure that it cannot touch metal.

Increase the distance between the EMI source and the actuator.

Install additional metal shielding material between the EMI source and the actuator or cable.

Replace the actuator.

Get the motor brake to where it operates freely and recalibrate.

22

Slide Valve Actuator Trouble Shooting Guide

Problem Reason Solution

The actuator does not transmit the correct position after a power loss

The motor was manually moved while the position sensor was not powered.

The motor brake is not working properly

Recalibrate.

Get the motor brake to where it operates freely and then recalibrate.

Replace the actuator.

There is a rapid clicking noise when the motor is operating

The position sensor’s EEPROM memory has failed

The photochopper is misaligned with the slotted optocouplers

The photochopper is positioned too low on the motor shaft.

Try to realign or replace the actuator.

Adjust the photochopper so that the fence extends further into the optocoupler slots.

Replace the actuator.

Tighten.

The motor operates in one direction only

A motor bearing has failed

There is a loose connection in the screw terminal blocks

There is a loose or dirty connection in the yellow Turck cable

The position sensor has failed

There is a broken motor lead or winding

Clean and tighten.

Replace the actuator.

Replace the actuator.

The motor will not move in either direction

The motor runs intermittently, several minutes on, several minutes off

The thermal switch has tripped because the motor is overheated

Any of the reasons listed in “The motor operates in one direction only”

The command shaft is jammed

Broken gears in the gearmotor

Motor is overheating and the thermal switch is tripping

The motor will resume operation when it cools. This could be caused by a malfunctioning control panel. Consult the factory.

See above.

Free the command shaft.

Replace the actuator.

This could be caused by a malfunctioning control panel. Consult the factory.

23

Slide Valve Actuator Trouble Shooting Guide

Problem Reason Solution

The motor runs sporadically

Bad thermal switch Replace the actuator.

Any of the reasons listed in “The motor will not move in either direction”

See above.

The motor runs but output shaft will not turn

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

*=ON

_=OFF

Meaning

*_*_*_*_*_*_*_*_*_*_*_ 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.

24

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.

25

26

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.

Operation

CONTROL SYSTEM

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 “Manual-Auto” 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.

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.

View Capacity

View Capacity

View Volume

Ratio

SLIDE VALVE ACTUATOR LOCATION:

VSG 401 CCW

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.

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.

View Volume

Ratio

SLIDE VALVE ACTUATOR LOCATION:

VSG 501 CW Thru VSG 701 CW

27

Operation

Table 1

COMMAND SHAFT ROTATION NO. OF TURNS / ROTATION ANGLE / SLIDE TRAVEL

COMP. CAPACITY VOLUME CAPACITY VOLUME

MODEL INC DEC INC DEC TURNS/DEGREES/TRAVEL TURNS/DEGREES/TRAVEL

VSSG 291 CW CCW CW CCW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045”

VSSG 341 CW CCW CW CCW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045”

VSSG 451 CW CCW CW CCW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045”

VSSG 601 CW CCW CW CCW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045”

VSG 751 CCW CW CCW CW 1.09 / 392 / 4.283” 0.63 / 227 / 2.473”

VSG 901 CCW CW CCW CW 1.09 / 392 / 4.283” 0.63 / 227 / 2.473”

VSG 1051 CCW CW CCW CW 1.22 / 439 / 4.777” 0.74 / 266 / 2.889”

VSG 1201 CCW CW CCW CW 1.22 / 439 / 4.777” 0.74 / 266 / 2.889”

VSG 1551 CCW CW CCW CW 1.36 / 490 / 5.325” 0.82 / 295 / 3.200”

VSG 1851 CCW CW CCW CW 1.36 / 490 / 5.325” 0.82 / 295 / 3.200”

VSG 2101 CCW CW CCW CW 1.36 / 490 / 5.325” 0.82 / 295 / 3.200”

VSG 301 CW CCW CW CCW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”

VSG 361 CW CCW CW CCW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”

VSG 401 CW CCW CW CCW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”

VSG 501 CCW CW CCW CW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045”

VSG 601 CCW CW CCW CW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045”

VSG 701 CCW CW CCW CW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045

”

NOTE: These refer to the old style gear motors and DO NOT apply to the new optical motors. Rotation for the optical motors is the OPPOSITE of what is shown in the chart.

B. Safety Setpoints

A detailed explanation of all safety setpoints can be found in the Compact Logix PLC manual, p/n 35391CL.

1. Oil Pressure

4. Oil Filter Differential

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

Low oil pressure differential stops the compressor unit when there is an insufficient difference in pressure between the oil manifold and suction.

6. Discharge Temperature

2. Discharge Pressure

The oil temperature cutout stops the compressor unit when the oil temperature is too high or too low.

High discharge pressure cutout stops the compressor unit, when the discharge pressure in the oil separator exceeds the setpoint.

The high discharge temperature cutout stops the compressor unit when the discharge temperature exceeds the setpoint.

3. Suction Pressure

Low suction pressure cutout stops the compressor unit when the suction pressure drops below the setpoint.

28

00 0,0 12

00 0,0 11

00 0,0 10

00 ,0 90

00 ,0 80

00 ,0 70

00 ,0 60

00 ,0 50

00 ,0 40

00 ,0 30

00 ,0 20

00 ,0 10

00 5,0

0 20

Maintenance

Gas Compression Maintenance and Inspection Schedule

29

30

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.

PREPARATION OF UNIT FOR SERVICING

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 On units equipped with Suction Oil Injection (SOI) manually open the SOI solenoid valve below the compressor. Drain the oil into appropriate containers.

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.

Small wooden block or fulcrum.

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.

Rigidly attach dial indicator.

Position it on the axis of the compressor.

Small wooden block or fulcrum.

Force to be determined by length of level arm.

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.

Rigidly attach dial indicator.

Use bolt for fulcrum.

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.

The following are the procedures used in measuring the main rotor and gate rotor bearing float.

BEARING CHECK

CAUTION

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.

1) Remove the coupling guard, then remove the center member from the coupling.

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

Bearing Float

MAIN GATE

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).

31

Service

TABLE 2. GATE ROTOR FLOAT

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”.

MODEL

VSG 301 THRU 401

VSG 501 THRU 701

VSSG 291 THRU VSSG 601

VSG 751 & VSG 901

VSG 1051 & VSG 1201

VSG 1551 THRU VSG 2101

FLOAT

0.045”

0.045”

0.045”

0.055”

0.060”

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.

32

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).

Service

GATE ROTOR ASSEMBLY CAUTION

For VSG 451 thru 601 compressors, do not use side rails.

90 1A

For VSSG 751/901 & VSG 1051/1201 compressors, use side rails and assemble to gaterotor stablizer as stamped.

90 1B

90 1C

Drive End

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.

REMOVAL ( All VSG

)

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.

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.

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 901-

2101 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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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.

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.

Gaterotor for C-flange Models

Service

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.

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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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.

Service

(with Relief)

GATE ROTOR BLADE INSTALLATION

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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42

GATE ROTOR THRUST BEARING INSTALLA-

TION

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 301-

701 units:

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

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).

Inner Retainer

Ball Bearings

Service

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).

COMPRESSOR SHAFT SEAL REMOVAL

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.

Seal with stationary carbon face (219B) and rotating mirror face (219C).

Current Shaft Seal and for all Replacement.

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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MAIN ROTOR ASSEMBLY 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.

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.

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 ASSEM-

BLIES

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 AS-

SEMBLIES

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.

Service

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.

Vent hole.

445

436

Reference “Parts

Section” for current

Housing

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.

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 refrigerant 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.

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.

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.

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.

Service

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.

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.

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

MEASUREMENT

Rack to clamp.

Rack to clamp spacer.

CLEARANCE

0.005 to 0.010”

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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C) To remove the cross shafts, remove socket head bolts, clamp and spacers from both sides.

VSG 751-2101 compressors cross shafts.

VSSG 291-601 compressors cross shafts

Volume control cross shaft.

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.

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.

52

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.

Service

TYPE BOLT

SAE GRADE 2

SAE GRADE 5

SAE GRADE 8

SOCKET HEAD

CAP SCREW

TORQUE SPECIFICATIONS (ALL UNITS IN FT.-LBS)

HEAD

MARKINGS 1

OUTSIDE DIAMETER OF BOLT SHANK

/

6

4

” 5 /

16

” 3 /

8

”

12 20

7 /

16

32

” 1 /

2

”

47

9 /

16

69

” 5 /

8

”

96

3 /

4

”

155

10 19 33 54 78 114 154 257

14 29 47 78 119 169 230 380

16 33 54 84 125 180 250 400

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 25 40 60 101 137 245

NUT 8

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

54

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.

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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.

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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.

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Gate Rotor

Gate Rotor

ITEM DESCRIPTION

GATE ROTOR BLADE AND BEARING

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.

102 GATE ROTOR SUPPORT ASSEMBLY

100, 111, 120B, 119 & 130.

105 GATE ROTOR GASKET SET 118, 141,

142 & 143 .

106 SHIM PACK SET (2) 121, (2) 122,

(1) 123, (1) 124.

110 SUPPORT.

111 GATE ROTOR.

2

2

2

2

2

2

2

MODEL NUMBER

VSSG 451 VSSG 601

QTY VPN QTY VPN

KT712A 2

KT713A 2

A25161BB 2

A25164B 2

A25165B 2

25606A 2

25557A 2

KT712B

KT713B

A25161BA

A25164B

A25165B

25520A

25534A

112 SMALL BEARING HOUSING.

113 LARGE BEARING HOUSING.

114 RETAINER.

115 RETAINER.

116 BALL BEARING COVER.

117 GATE ROTOR COVER.

118 GATE ROTOR COVER GASKET.

119 WASHER.

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.

ar

ar

2

4

2

2

ar

ar

2

2

2

2

2

2

2

2

2

2

2

2

2866A

2867A

2868B

25910A

2

2

2176M

2176R

2 2176N

12 2796AJ

6 2796B

40 2796CJ

32 2796E

12 2795E

25518A

25517A

25008A

25009A

25258A

25519A

25259A

25007A

25006A

25760A

25010AA

25010AB

25010AC

25010AD

2864B

2865B

ar

ar

2

4

2

2

ar

ar

2

2

2

2

2

2

2

2

2

2

2

2

2866A

2867A

2868B

25910A

2

2

2176M

2176R

2 2176N

12 2796AJ

6 2796B

40 2796CJ

32 2796E

12 2795E

25518A

25517A

25008A

25009A

25258A

25519A

25259A

25007A

25006A

25760A

25010AA

25010AB

25010AC

25010AD

2864B

2865B

NOTE: ar = As Required

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Gate Rotor

ITEM DESCRIPTION

GATE ROTOR BLADE AND BEARING

102

105

110

111

118

119

122*

123*

124*

125

126

130

131

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.

GATE ROTOR COVER GASKET.

WASHER.

120A BUSHING, SMALL DOWEL PIN.

120B BUSHING, LARGE DOWEL PIN.

121* SHIM 0.002”.

SHIM 0.003”.

SHIM 0.005”.

SHIM 0.010”.

ROLLER BEARING.

BALL BEARING.

RETAINING RING.

RETAINING RING.

VSG 751

QTY VPN

2

2

2

2

4

2

2

135A DOWEL PIN, SMALL, 0.3125” O.D.. 2

135B DOWEL PIN, LARGE, 0.4375” O.D.. 2

141

142

143

O-RING ROLLER BRG HSG.

O-RING BALL BRG HSG.

O-RING BRG HSG COVER.

2

2

2

2

2

2 ar

2

2

2

2 ar ar ar

2

KT712C

KT713C

A25161CB 2

A25164C 2

A25165C 2

25612A

25608A

25088A

25086A

25087A

VSG 901

QTY VPN

2

2

2

2

25760B

25089AA ar

25089AB ar

25089AC ar

2

2

2

2

25089AD ar

2864C

2865A

2866B

2867E

2868F

25910B

2176N

2176V

2176U

2

4

2

2

2

2

2

2

2

KT712D

KT713D

25553A

25554A

25088A

25086A

25087A

25760B

25089AA ar

25089AB ar

25089AC ar

25089AD ar

2864C

2865A

2866B

2867E

2868F

25910B

2176N

2176V

2176U

VSG 1051

QTY VPN

2

2

A25161CA 2

A25164C 2

A25165C 2

2

2

2

2

2

2

2

4

2

2

2

2

2

2

2

KT712E

KT713E

VSG 1201

QTY VPN

2

2

A25161DB 2

A25164D 2

A25165C 2

25614A

25610A

25132A

25086A

25104A

2

2

25760B

25089AA ar

25089AB ar

25089AC ar

2

2

2

2

25089AD ar

2864G

2865A

2866B

2867L

2868H

2

4

25910B

2176AJ

2176AM 2

2176U

2

2

2

2

2

2

KT712F

KT713F

A25161DA

A25164D

A25165C

25587A

25588A

25132A

25086A

25104A

25760B

25089AA

25089AB

25089AC

25089AD

2864G

2865A

2866B

2867L

2868H

25910B

2176AJ

2176AM

2176U ar = As Required

60

Gate Rotor

131

135A

135B

141

142

143

150

151

152

153

160

120B

121*

122*

123*

124*

125

126

130

113

114

115

116

117

118

119

120A

105

110

111

112

101

102

ITEM DESCRIPTION

GATE ROTOR BLADE AND BEARING

REPLACEMENT KIT, 111, 118, 120A,

120B, 121, 122, 123, 124, 125, 126, 130,

131, 141, 142 & 143.

GATE ROTOR BLADE REPLACEMENT

KIT, 111, 118, 120A, 120B, 121, 122, 123,

124, 130, 141, 142 & 143.

GATE ROTOR ASSEMBLY 111 & 120.

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.

SMALL BEARING HOUSING.

LARGE BEARING HOUSING.

RETAINER.

RETAINER.

BALL BEARING COVER.

GATE ROTOR COVER.

GATE ROTOR COVER GASKET.

WASHER.

BUSHING, SMALL DOWEL PIN.

BUSHING, LARGE DOWEL PIN.

SHIM 0.002”.

SHIM 0.003”.

SHIM 0.005”.

SHIM 0.010”.

ROLLER BEARING.

BALL BEARING.

RETAINING RING.

RETAINING RING.

DOWEL PIN, SMALL, 0.375” O.D..

DOWEL PIN, LARGE, 0.500” O.D..

O-RING ROLLER BRG HSG.

O-RING BALL BRG HSG.

O-RING BRG HSG COVER.

HEX HEAD CAP SCREW.

HEX HEAD CAP SCREW.

HEX HEAD CAP SCREW.

HEX HEAD CAP SCREW.

SOCKET HEAD CAP SCREW.

VSG 1551

QTY VPN

2

2

2

2

2

2

2

12

8

32

44

16

2

2

2

2 ar

2

4

2

2 ar ar ar

2

2

2

2

2

2

2

2

2

2

2

2

KT712M

KT713N

A25160EB

A25161EB

A25164E

25791AD

2864K

2865K

2866G

2867R

2868H

25910C

2176U

2176BD

2176P

2796CJ

2796N

2796CJ

2796R

2795G

A25165E

25687A

25647A

25667A

25669A

25141A

25789A

25351A

25354A

25790A

25788A

25104A

25760C

25791AA

25791AB

25791AC

VSG1851

QTY VPN

KT712L

KT713M

A25160EA

A25161EA

A25164E

25791AD

2864K

2865K

2866G

2867R

2868H

25910C

2176U

2176BD

2176P

2796CJ

2796N

2796CJ

2796R

2795G

A25165E

25665A

25645A

25667A

25669A

25141A

25789A

25351A

25354A

25790A

25788A

25104A

25760C

25791AA

25791AB

25791AC

2

2

2

2

12

8

32

44

16

2

2

2

2 ar

2

4

2

2 ar ar ar

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

VSG 2101

QTY VPN

KT712K

KT713L

A25160EA

A25161EL

A25164E

25791AD

2864K

2865K

2866G

2867R

2868H

25910C

2176U

2176BD

2176P

2796CJ

2796N

2796CJ

2796R

2795G

A25165E

25495D

25744D

25667A

25669A

25141A

25789A

25351A

25354A

25790A

25788A

25104A

25760C

25791AA

25791AB

25791AC

2

2

2

2

12

8

32

44

16

2

2

2

2 ar

2

4

2

2 ar ar ar

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2 ar = As required

61

Shaft Seal

62

Shaft Seal With Stationary Carbon Face

ITEM DESCRIPTION

MODEL NUMBER

VSSG 291-601

QTY VPN

SHAFT SEAL VITON KIT, 219, 260, 230 1

VSG 751-1201

QTY VPN

KT709AG 1

VSG 1551 thru 2101

QTY VPN

KT709BG 1 KT709CG

230

260

OIL SEAL.

O-RING.

1

1

25040A

2176F

1

1

25064A 1

2176AC 1

2930B

2176BH

Tandem Shaft Seal

DESCRIPTION

TANDEM SHAFT SEAL

SHAFT DIAMETER

2.25”

QTY VPN

1

1

25713A

25713B

2.5”

QTY VPN

1

1

25713A

25713B

2.875”

QTY VPN

1

1

25713A

25713B

63

64

Main Rotor

201

65

66

Slide Valve Cross Shafts and End Plate

Slide Valve Cross Shafts and End Plate

222

226

227

228

268

269

286

297

298

ITEM DESCRIPTION

221 SHAFT.

GEAR.

RACK CLAMP.

RACK CLAMP.

SPACER.

EXPANSION PIN.

EXPANSION PIN.

SOCKET HEAD CAP SCREW.

SET SCREW

SET SCREW

MODEL NUMBER

VSSG 291-601

QTY

2

4

2

2

2

4

4

8

2

2

VPN

25843A

25027A

25913A

25913B

25847A

1193D

2981AA

2795F

2060J

2060H

221

222

226

228

267

268

269

270

ITEM DESCRIPTION

220 END PLATE

SHAFT.

GEAR.

286

297

298

RACK CLAMP.

SPACER.

DOWEL PIN.

EXPANSION PIN.

EXPANSION PIN.

PIPE PLUG.

SOCKET HEAD CAP SCREW.

SET SCREW

SET SCREW

MODEL NUMBER

VSG 751 & VSG 901 VSG 1051 & VSG 1201

QTY VPN

1

2

4

4

2

2

4

4

4

8

2

2

25543A

25844A

25027A

25913C

25033C

2868B

1193D

2981AA

2606E

2795F

2060J

2060H

4

2

8

2

2

4

4

2

4

QTY

1

2

4

VPN

25593A

25845A

25027A

25913C

25033C

2868B

1193D

2981AA

2606E

2795F

2060J

2060H

221

222

226

228

267

268

269

270

ITEM DESCRIPTION

220 END PLATE

SHAFT.

GEAR.

286

297

298

RACK CLAMP.

SPACER.

DOWEL PIN.

EXPANSION PIN.

EXPANSION PIN.

PIPE PLUG.

SOCKET HEAD CAP SCREW.

SET SCREW

SET SCREW

MODEL NUMBER

VSG 1551Thru VSG 2101

QTY

1

2

4

4

4

2

4

4

2

8

2

2

VPN

25661A

25793A

25027A

25913C

25033C

2868B

1193D

2981AA

2606A

2795F

2060J

2060H

67

68

Slide Valve Carriage Assembly

Slide Valve Carriage Assembly

MODEL NUMBER-

ITEM DESCRIPTION

300

304

305

307

316

340, 341, 350 & 355

340, 342, 350 & 355

323 RACK.

343A COVER, SEPARATE VOL. & CAP.

343B COVER, ONE PIECE CAST.

345A GASKET, SEPARATE VOL. & n/a

CAP COVERS.

345B GASKET, ONE PIECE CAST COVER.

350

355

359

360

361

363

CARRIAGE ASSEMBLY.

CAPACITY PISTON

VOLUME PISTON

GASKET SET 345B.

RACK.

PISTON RING SET.

EXPANSION PIN.

PIPE PLUG.

LOCK WASHER (PAIR).

WASHER.

NUT.

366A HEX HEAD CAP SCREW, SEPARATE

VOL. & CAP COVERS.

366B HEX HEAD CAP SCREW, ONE PIECE

CAST COVER.

VSSG 291 Thru VSSG 601

2

2

2

4

2

QTY

2

2

2

4

2

4

4

6

4

4

8

24

24

VPN

A25179B

A25183B

A25184B

A25200B

25024A

25023A

25022A

25399A

25021A

25900A

2953AA

1193PP

2606D

3004C

13265B

2797A

2796N

2796B

69

Slide Valve Carriage Assembly

304

305

307

316

323

340

341

342

ITEM DESCRIPTION

300 CARRIAGE ASSEMBLY.

CAPACITY PISTON 340, 341, 350 & 355 . 2

VOLUME PISTON 340, 342, 350 & 355.

2

GASKET SET 345B & 378**.

RACK.

RACK.

PISTON.

CAPACITY PISTON SHAFT.

VOLUME PISTON SHAFT.

343A COVER, SEPARATE VOL. & CAP.

343B COVER, ONE PIECE CAST.

344 COVER, SEPARATE VOL. & CAP.

345A GASKET, SEPARATE VOL. &

CAP COVERS. 2

345B GASKET ONE PIECE CAST COVER. 2

346

347

350

2

2

2

2

2

2

2

2

4

355

359

360

361

GASKET, SEPARATE VOL. & CAP

COVERS.

PISTON SLEEVE.

PISTON RING SET.

363 NUT.

366A HEX HEAD CAP SCREW.

366B HEX HEAD CAP SCREW.

367

373

374

378

380

EXPANSION PIN.

PIPE PLUG.

LOCK WASHER (PAIR).

WASHER.

HEX HEAD CAP SCREW.

SOCKET HEAD CAP SCREW.

LOCK WASHER (PAIR).

0-RING.

RETAINER RING.

6

2

2

12

12

12

6

6

4

4

8

2

2

4

4

MODEL NUMBER

VSG 751

QTY VPN

2

VSG 901

QTY VPN

A25179C 2

A25183C 2

VSG 1051

QTY VPN

A25179C 2

A25183C 2

VSG 1201

QTY VPN

A25179D 2

A25183D 2

A25184C 2

A25200C 2

25080A

25080B

25076A

25078A

25078B

25123B

25279A

25123A

2

2

2

2

2

2

4

2

A25184C 2

A25200C 2

25080A

25080B

25076A

25078A

25078B

25123B

25279A

25123A

2

2

4

2

2

4

A25184D 2

A25200D 2

25080C 2

25080D 2

25138A

25078E

25078F

25123C

2 25401A n/a n/a

4

2

2

4

A25179D

A25183D

A25184D

A25200D

25080C

25080D

25138A

25078E

25078F

25123C

2 25401A n/a n/a

25124B

25902A

25124A

25079A

2606D

3004C

13265B

2797A

3004C

2176Y

2866C

2

2

2

2

2953AB 4

1193PP 4

2796B

2796P

12

12

2796BN 12

2795N 6

6

2

2

6

4

4

8

25124B

25902A

25124A

25079A

3004C

2176Y

2866C

4

2 n/a n/a

2953AB 4

1193PP 4

25124C

25901A n/a n/a

4

2

25124C

25901A n/a n/a n/a n/a

2953AC 4

1193PP 4

2606D

3004C

13265B

2797A

6

4

4

8

2606E

3004C

13265B

2797A

2796B

2796P

24

24

2796B

2796P

2796BN n/a n/a

2795N 6

6

2795P

3004D n/a n/a n/a n/a

6

4

4

8

24

24 n/a

6

6

2953AC

1193PP

2606E

3004C

13265B

2797A

2796B

2796P n/a

2795P

3004D n/a n/a n/a n/a

70

Slide Valve Carriage Assembly

ITEM DESCRIPTION

300

304

305

307

316

323

325

340

341

CARRIAGE ASSEMBLY.

CAPACITY PISTON

VOLUME PISTON

340, 341, 350 & 355

340, 342, 350 & 355

GASKET SET 345 & 378.

RACK.

RACK.

SHAFT.

PISTON.

CAPACITY PISTON SHAFT.

342 VOLUME PISTON SHAFT.

343B COVER.

MODEL NUMBER

VSG 1551 to 2101

QTY VPN

2

2

2

A25179E

A25183E

A25184E

A25200E

345B GASKET.

347

350

355

359

360

361

363

PISTON SLEEVE.

PISTON RING SET.

EXPANSION PIN.

PIPE PLUG.

LOCK WASHER (PAIR).

WASHER.

NUT.

366B HEX HEAD CAP SCREW.

373

374

378

380

SOCKET HEAD CAP SCREW.

LOCK WASHER (PAIR).

0-RING.

RETAINER RING.

6

4

4

8

2

4

4

4

28

6

6

4

4

4

2

2

2

2

2

2

2

25779A

25780A

25778A

25782A

25784A

25783A

25690A

25384A

25786A

2953AD

1193PP

2606E

3004C

13265B

2797A

2796BL

2795AG

3004D

2176AG

2755AG

71

72

Actuator & Command Shaft

ITEM DESCRIPTION

400

401

446

COMMAND SHAFT ASSEMBLY

SLIDEVALVE ACUATOR

O-RING

Actuator & Command Shaft

2

2

2

MODEL NUMBER

VSSG 291 thru

VSSG 601

QTY VPN

A25994B

25972D

2176X

VSG 751 thru

VSSG 901

VPN

A25994C

25972D

2176X

VSG 1051 thru

VSG 1201

VPN

A25994D

25972D

2176X

VSG 1551 thru

VSG 2101

VPN

A25994E

25972D

2176X

73

74

VSG Screw Compressor

Miscellaneous Frame Components

Miscellaneous Frame Components

ITEM DESCRIPTION

504

506

GASKET AND O-RING KIT;

FLANGE SET 513, 514 & 547A.

ECON-O-MIZER PORT.

539

540

545

545

547

552

552

553

650

651

519

524

525

527

528

530

532

535

512

513

513

514

MANIFOLD GASKET.

FLANGE OIL.

AFLANGE ECON-O-MIZER.

FLANGE GASKET OIL.

514A FLANGE GASKET ECON-O-MIZER.

518 SUCTION FLANGE GASKET.

DISCHARGE FLANGE GASKET.

COVER.

GASKET.

INLET SCREEN.

ECON-O-MIZER PLUG.

O-RING

O-RING

PIPE PLUG 1 /

4

” MPT.

PIPE PLUG.

DOWEL PIN.

HEX HEAD CAP SCREW FOR OIL

SUPPLY FLANGE.

HEX HEAD CAP SCREW FOR

ECON-O-MIZER FLANGE.

HEX HEAD CAP SCREW.

HEX HEAD CAP SCREW.

HEX HEAD CAP SCREW.

HEX HEAD CAP SCREW.

O-RING.

O-RING.

2 n/a n/a n/a

2 n/a n/a n/a

2

1

1

2

1

2

1

1 n/a n/a

2 n/a

4

8 n/a n/a n/a n/a n/a

MODEL NUMBER

VSSG 291 thru

VSSG 601

QTY VPN

1

1

KT710A1

A25190A

A25190B n/a

2796C n/a

2796C

2796C n/a n/a n/a n/a n/a

25503A

25058A

25058A

11323D

11323D

25199C

25199B n/a n/a n/a n/a

2176AB n/a n/a n/an/an/a

2868B

75

Miscellaneous Frame Components

526

529

530

538

540

547

554

504

512

513

514

518

519

ITEM DESCRIPTION

MODEL NUMBER

VSG 751 VSG 901

QTY VPN QTY VPN QTY

GASKET AND O-RING KIT;

FLANGE SET 513, 514 & 547.

MANIFOLD GASKET.

FLANGE OIL.

FLANGE GASKET OIL.

SUCTION FLANGE GASKET.

DISCHARGE FLANGE GASKET.

ORIFICE PLATE.

WAVE SPRING.

O-RING

PIPE PLUG 3/4” MPT.

DOWEL PIN.

HEX HEAD CAP SCREW.

HEX HEAD CAP SCREW.

1 KT710B

1 A25190A

1 25541A

1 25058A

1 11323D

1 25199C

1 25199B

1

1

1

1

1

1

1

1 25223CB 1

1 2912E

2 2176J

2 2868B

21 2796GP

1 2796U

1

2

2

21

1

KT710B

A25190A

25541A

25058A

11323D

25199C

25199B

25223CA

2912E

2176J

2868B

2796GP

2796U

VSG 1051

1

1

1

1

1

1

1

1

1

2

6

2

24

1

VPN QTY VPN

KT710C 1

A25190B 1

25324A

25058B

1

1

11323E 1

25199D 1

25199C 1

25223DB 1

2912E

2176J

2606A

2868B

1

2

6

2

2796GP

2796U

VSG 1201

1

KT710C

A25190B

25324A

25058B

11323E

25199D

25199C

25223DB

2912E

2176J

2606A

2868B

24 2796GP

2796U

76

Miscellaneous Frame Components

ITEM DESCRIPTION

GASKET AND O-RING KIT;

504 FLANGE SET 513, 514 & 547.

504 FLANGE SET 513A, 514A & 547

ECON-O-MIZER PORT.

512 MANIFOLD GASKET.

513 FLANGE OIL.

513A FLANGE ECON-O-MIZER.

514 FLANGE GASKET OIL.

514A FLANGE GASKET ECON-O-MIZER.

1

2

1

1

518

519

530

538

540

542

SUCTION FLANGE GASKET.

DISCHARGE FLANGE GASKET.

O-RING

PIPE PLUG 3/4” MPT.

DOWEL PIN.

PIPE PLUG 3/4” MPT.

545 HEX HEAD CAP SCREW FOR

OIL SUPPLY FLANGE.

1

1

2

3

2

1

MODEL NUMBER

VSG 1551 THRU

VSG 2101

QTY VPN

1

1

KT710D

A25190C

4

A25190D

25676A

12477C

11323F

25199D

25199C

2176J

2606A

2868K

13163F

11397E

NOTE: *Not pictured

**For VSS 1801 Serial Numbers 819, 820 & 821 only.

77

78

Replacement Tools

Replacement Tools

MODEL NUMBER

ITEM DESCRIPTION

900

901

GATEROTOR TOOLS (901, 910, 911,

912, 913, 914, 915, 916 & 917).

GATEROTOR STABILIZER SET

(901A, 901B & 901C).

VSSG 291 thru

VSSG 601

QTY VPN

1

1

A25205B

A25698A

ITEM DESCRIPTION

900

901

GATEROTOR TOOLS (901, 910, 911,

912, 913, 914, 915, 916 & 917).

GATEROTOR STABILIZER SET

(901A, 901B & 901C).

1

1

MODEL NUMBER

VSG 751

QTY VPN

VSG 901

QTY VPN

A25205C 1

A25698A 1

VSG 1051

QTY VPN

A25205C 1

A25698A 1

VSG 1201

QTY VPN

A25205C 1

A25698A 1

A25205C

A25698A

79

80

Replacement Tools

ITEM DESCRIPTION

900

901

GATEROTOR TOOLS (901, 910, 911,

912, 913, 914, 915, 916 & 917).

GATEROTOR STABILIZER SET

(901A, 901B, 901C & 901D).

MODEL NUMBER

VSG 1551 thru

VSG 2101

QTY VPN

1

1

A25205E

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.

81

82

Gaterotor Assembly

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

MODEL NUMBER

VSG 301

QTY VPN

SUPPORT ASSEMBLY 110 & 135B. 1

VSG 361

QTY VPN

A25222AB 1

VSG 401

QTY VPN

A25222AA 1 A25222AC

101

102

110

111

GATE ROTOR & DAMPER ASSEMBLY

111,120.

GATE ROTOR SUPPORT ASSEMBLY

100, 101, 119 & 130.

SHIM PACK SET (2) 121, (2) 122,

(1) 123, (1) 124.

SUPPORT.

GATE ROTOR.

114

115

118

119

SNAP RING.

RETAINER BALL BEARING

GATE ROTOR COVER GASKET.

WASHER WAVE SPRING.

120 DAMPER.

121* SHIM 0.002”.

122* SHIM 0.003”.

123* SHIM 0.005”.

124*

125

126

130

131

132

135

141

143

155

156

SHIM 0.010”.

ROLLER BEARING.

BALL BEARING.

RETAINING RING.

RETAINING RING.

RETAINING RING.

DOWEL PIN

O-RING ROLLER BRG HSG.

O-RING BALL BRG SUPPORT.

SHIM

SHIM

1

1

1

1

1

1

1

1

1

1 ar ar ar ar

1

1

1

1 ar ar

1

2

1

1

A25160AB 1

A25161AB 1

A25165A 1

25723D 1

25718B

2867L

25935A

25259B

3203A

25760A

1

1

1

1

1

1

25921AA ar

25921AB ar

25921AC ar

25921AD ar

2864F

2865L

2866H

2867S

2866J

25910A

1

2

1

1

2176L

2176F

25977D ar

25977C ar

1

1

1

1

A25160AA

A25161AA

A25165A

25723C 1

25718C 1

2867L

25935A

25259B

3203A

25760A

1

1

1

1

1

25921AA ar

25921AB ar

25921AC ar

25921AD ar

2864F

2865L

2866H

2867S

2866J

1

2

25910A

2176L

2176F

1

1

25977D ar

25977C ar

1

1

1

1

A25160AC

A25161AC

A25165A

25723B

25718D

2867L

25935A

25259B

3203A

25760A

25921AA

25921AB

25921AC

25921AD

2864F

2865L

2866H

2867S

2866J

25910A

2176L

2176F

25977D

25977C ar = As required

83

84

Gaterotor Assembly

Part totals indicated are for one gate rotor assembly, dual gate machines will require double the components.

ITEM DESCRIPTION

MODEL NUMBER

VSG 501

QTY VPN

SUPPORT ASSEMBLY 110 & 135B. 1

VSG 601

QTY VPN

A26011BB 1

VSG 701

QTY VPN

A26011BA 1 A26011BA 100

101

102

110

GATE ROTOR & DAMPER ASSEMBLY

111,120.

GATE ROTOR SUPPORT ASSEMBLY

100, 101, 119 & 130.

SHIM PACK SET (2) 121, (2) 122,

(1) 123, (1) 124.

SUPPORT.

GATE ROTOR. 111

114

115

118

119

120

SNAP RING.

RETAINER BALL BEARING

GATE ROTOR COVER GASKET.

WASHER.

DAMPER.

121* SHIM 0.002”.

122* SHIM 0.003”.

123* SHIM 0.005”.

124* SHIM 0.010”.

125

126

130

131

132

135

141

143

155

156

ROLLER BEARING.

BALL BEARING.

RETAINING RING.

RETAINING RING.

RETAINING RING.

DOWEL PIN

O-RING ROLLER BRG HSG.

O-RING BALL BRG SUPPORT.

SHIM

SHIM

1

1

1

1

1

1

1

1

1

1

1

1

1

1 ar ar

1

1

1

1 ar ar ar ar

A26002BB 1

A26003BB 1

A26035B 1

26030BB 1

26032A

2867U

2866A

2867A

2866K

25910A

1

1

25935B 1

25259C 1

25007A

25760A

1

1

26027AA ar

26027AB ar

26027AC ar

26027AD ar

2864B

2865B

2176M

2176R

25977G ar

25977H ar

1

1

1

1

1

1

1

1

A26002BA 1

A26003BA 1

A26035B 1

26030BA 1

26031A

2867U

1

1

25935B 1

25259C 1

25007A

25760A

1

1

26027AA ar

26027AB ar

26027AC ar

26027AD ar

2864B

2865B

2866A

2867A

2866K

25910A

2176M

2176R

25977G ar

25977H ar

1

1

1

1

1

1

1

1

A26002BC

A26003BC

A26035B

26030BA

26033A

2867U

25935B

25259C

25007A

25760A

26027AA

26027AB

26027AC

26027AD

2864B

2865B

2866A

2867A

2866K

25910A

2176M

2176R

25977G

25977H

NOTE: * Not pictured ar = As Required

Shaft Seal

*

ITEM DESCRIPTION

SHAFT SEAL KIT Viton Kit

219, 230, & 260.

219

230

SHAFT SEAL.

OIL SEAL.

244- TEFLON SEAL

252- RETAINER RING

260

261

O-RING

O-RING. (205 Only)

1

1

1

1

1

1

MODEL NUMBER

ALL VSG 301-401

QTY VPN

1 KT709DG

A

2930C

25939A

2928M

2176U

2176AE

1

1

1

1

1

ALL VSG 501-701

QTY VPN

1 KT709AG

A

25040A

25939A

2928M

2176F n/a

NOTE *

A

-

Not pictured.

Sold only as kit.

See recommended spare parts lists for complete assembly.

85

86

Main Rotor, Slide Valve Cross Shafts & End Plate

Models VSG301-401 Counter Clockwise ONLY

Main Rotor, Slide Valve Cross Shafts & End Plate

Models VSG301-401 Counter Clockwise ONLY

227

228

240

241

242

243

244

248

203

217

220

221

222

ITEM DESCRIPTION

201 MAIN ROTOR ASSEMBLY.

OIL BAFFLE ASSEMBLY (1)

217, (1) 244, (1) 248, (1) 249, (1) 252. 1

249

252

268

269

281

286

297

298

SHIM ASSORTMENT (2) 240,

(2) 241, (1) 242, (1) 243

OIL BAFFLE PLATE .

END PLATE.

SHAFT.

GEAR.

CLAMP.

SPACER.

SHIM 0.002”

SHIM 0.003”

SHIM 0.005”

SHIM 0.010”

TEFLON RING.

CHECK VALVE.

CHECK VALVE.

RETAINING RING

EXPANSION PIN.

EXPANSION PIN.

271** PLUG SOLID

HEX HEAD CAP SCREW.

SOCKET HEAD CAP SCREW.

SET SCREW.

SET SCREW.

MODEL NUMBER

VSG 301

QTY VPN

1

VSG 361

QTY VPN

A25226AB 1 A25226AA 1

VSG 401

QTY VPN

A25226AC

1

1

1

2

4

1

6

8

2

2

1

1

1

4

A

A

A

1

4

4

4

A

A25942AA 1

A25177A 1

25938A

2795F

2060J

2060H

1

25719D 1

25941A

25027A

25913A

25847A

25409AA A

25409AB A

25409AC A

25409AD A

25939A

3120A

3120B

2829M

1193D 4

2981AA 4

25422A

2796N

1

1

1

1

2

4

4

4

1

6

8

2

2

A25942AA 1

A25177A 1

25938A

25719D 1

25941A

25027A

25913A

25847A

1

25409AA A

25409AB A

25409AC A

25409AD A

25939A

3120A

3120B

2829M

1193D 4

2981AA 4

25422A

2796N

1

1

1

1

2795F

2060J

2060H

2

4

4

4

1

6

8

2

2

A25942AA

A25177A

25938A

25719D

25941A

25027A

25913A

25847A

25409AA

25409AB

25409AC

25409AD

25939A

3120A

3120B

2829M

1193D

2981AA

25422A

2796N

2795F

2060J

2060H

NOTE: * Not pictured.

**

A

Required at top locate single gaterotor only.

As required.

87

88

Main Rotor, Slide Valve Cross Shafts & End Plate

Models VSG501-701 Clockwise ONLY

Main Rotor, Slide Valve Cross Shafts & End Plate

Models VSG501-701 Clockwise ONLY

255

256

268

269

281

282

297

298

240

241

242

243

244

248

249

252

203

220

221

222

228

ITEM DESCRIPTION

201 MAIN ROTOR ASSEMBLY.

OIL BAFFLE ASSEMBLY (1) 217,

(1) 244, (1) 248, (1) 249, (1) 252.

SHIM ASSORTMENT (2) 240,

(2) 241, (1) 242, (1) 243

END PLATE.

SHAFT.

GEAR.

SPACER.

SHIM 0.002”

SHIM 0.003”

SHIM 0.005”

SHIM 0.010”

TEFLON RING.

CHECK VALVE.

CHECK VALVE.

RETAINING RING

WASHER

WASHER

EXPANSION PIN.

EXPANSION PIN.

HEX HEAD CAP SCREW.

SOCKET HEAD CAP SCREW

SET SCREW.

SET SCREW.

1

2

2

4

A

1

1

1

4

8

2

2

2

4

A

A

A

1

1

2

4

MODEL NUMBER

VSG 501

QTY VPN

1

VSG 601

QTY VPN

A26010BB 1 A26010BA 1

VSG 701

QTY VPN

A26010BC

1 A26034B 1 A26034B 1 A26034B

A25177B 1

26025B

25843A

25027A

25847A

1

2

4

4

25255AA A

25255AB A

25255AC A

25255AD A

25929B 1

1

1

1

3120A

3120B

2928N

25977E

25977F

1193D

2

2

4

2981AA 4

2796B

2795D

2060J

2060H

8

2

2

2

A25177B 1

26025B

25843A

25027A

25847A

1

2

4

4

25255AA A

25255AB A

25255AC A

25255AD A

25929B 1

1

1

1

3120A

3120B

2928N

25977E

25977F

1193D

2

2

4

2981AA 4

2796B

2795D

2060J

2060H

8

2

2

2

A25177B

26025B

25843A

25027A

25847A

25255AA

25255AB

25255AC

25255AD

25929B

3120A

3120B

2928N

25977E

25977F

1193D

2981AA

2796B

2795D

2060J

2060H

NOTE: * Not pictured.

A As required.

89

90

Slide Valve Carriage Assembly

Slide Valve Carriage Assembly

ITEM DESCRIPTION

300

304

305

316

318

323

325

350

360

361

363

372*

CARRIAGE ASSEMBLY.

CAPACITY PISTON 340, 341, 350 & 355.

1

VOLUME PISTON 340, 342, 350 & 355 . 1

CAPACITY RACK.

CAPACITY RACK SHAFT.

VOLUME RATIO RACK.

VOLUME RATIO RACK SHAFT.

PISTON RING SET.

LOCK WASHER (PAIR).

WASHER.

NUT.

SOCKET HEAD CAP SCREW.

MODEL NUMBER

ALL VSG 301-401 ALL VSG 501-701

QTY VPN

1

2

2

2

4

1

1

1

1

QTY VPN

A25179A 1

A25183A 1

A25184A 1

25023D

25772C

25023C

25772D

1

1

1

1

2953AE 2

3004C

13265B

2797A

N/A

2

2

4

1

A26012B

A25183B

A25184B

25024A

25772A

25023A

25772B

2953AA

3004C

13265B

2797A

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.

91

92

Actuator & Command Shaft

ITEM DESCRIPTION

400

401

446

COMMAND SHAFT ASSEMBLY

SLIDEVALVE ACUATOR

O-RING

Actuator & Command Shaft

2

2

2

MODEL NUMBER

VSSG 291 thru

VSSG 601

QTY VPN

A25994B

25972D

2176X

VSG 751 thru

VSSG 901

VPN

A25994C

25972D

2176X

VSG 1051 thru

VSG 1201

VPN

A25994D

25972D

2176X

VSG 1551 thru

VSG 2101

VPN

A25994E

25972D

2176X

93

94

Miscellaneous Frame Components

Model VSG 301-401

Model VSG 501-701

Miscellaneous Frame Components

514

522

523

528

530

540

542

551

ITEM DESCRIPTION

512 MANIFOLD GASKET.

ECON-O-MIZER GASKET.

COUPLING LOCK PLATE

570

571

572

LOCK WASHER

ECON-O-MIZER PLUG.

O-RING

DOWEL PIN

PIPE PLUG

HEX HEAD CAP SCREW

BEARING OIL PLUG

PLUG

SPRING

MODEL NUMBER

ALL VSG 301-401 ALL VSG 501 - 701

QTY VPN

1 25737A

QTY VPN

1

11323GG 2 2 n/a n/a

2 n/a

2

3 n/a

1

1

1

25419A

2868B

2606C

25978A

25979A

3148A

1

1

2

2

2

10

3004H

25397K

2176BF

2868B

2606B

2 n/a

2796C n/a n/a

26037A

11323D

25004D

Notes*. Not Pictured.

95

96

Miscellaneous Frame Components

Miscellaneous Frame Components

Housing Accessories

ITEM DESCRIPTION

117

118

129

180

343

GATE ROTOR COVER.

COVER GASKET.

GASKET.

INLET SCREEN.

PISTON COVER. *

2

1

1

1

MODEL NUMBER

VSG 301 - 701

QTY

1

VPN

25416B

25259B

11323T

25920A

25724B

ITEM DESCRIPTION

345

346

O-RING.

O-RING.

MODEL NUMBER

VSG 301 - 401

QTY VPN

VSG 501 - 701

QTY VPN

4

2

2176BX 4

2176BG 2

2176CA

2176BG

97

Replacement Tools

98

ITEM DESCRIPTION

901

902

GATEROTOR STABILIZER.

SEAL INSTALLATION TOOL

MODEL NUMBER

ALL VSG 301-401 ALL VSG 501-701

QTY VPN

1

1

25742A

25455A

QTY VPN

1

1

25742B

25455B

99

EmersonClimate.com

Vilter Manufacturing LLC

P.O. Box 8904

Cudahy, WI. 53110-8904

P: 414-744-0111

F: 414-744-1769 www.vilter.com

100

(1/2011) Emerson and Vilter are trademarks of Emerson Electric Co. or one of its affiliated companies.

©2011 Emerson Climate Technoligies, Inc. All rights reserved. Printed in the USA.

35391SB Rev. 06