Emerson Air Compressor VSR Brands Vilter Manual VSM VSS

User Manual: Emerson Air Compressor VSR

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35391S Rev 06
remoteoilcool1

VSS / VSR / VSM

Single Screw Compressor

Operation and Service Manual

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 can-

not warrant equipment damaged by improperly protected or operating systems.

Vilter screw compressor components are thoroughly inspected at the factory. However, damage can occur

in shipment. For this reason, the equipment should be thoroughly inspected upon arrival. Any damage

noted should be reported immediately to the Transportation Company. This way, an authorized agent

can examine the unit, determine the extent of damage and take necessary steps to rectify the claim with

no serious or costly delays. At the same time, the local Vilter representative or the home office should

be notified of any claim made.

All inquires should include the Vilter sales order number, compressor serial and model number. These can be

found on the compressor name plate on the compressor.

All requests for information, services or parts should be directed to:

Vilter Manufacturing LLC

Customer Service Department

P.O. Box 8904

5555 South Packard Ave

Cudahy, WI 53110-8904 USA

Telephone: 1-414-744-0111

Fax:1-414-744-3483

e-mail: info.vilter@emerson.com

Equipment Identification Numbers:

Vilter Order Number: _______________________Compressor Serial Number: _________________

Important Message

Table of Contents

Appendix A: Pre Start Up for Remote Oil Coolers

Important Message ..........................................................................................3

Standard VILTER Warranty Statement ..............................................................6

Long Term Storage Requirements .....................................................................7

Description .......................................................................................................9

Foundation ..................................................................................................... 11

Rigging and Lifting .........................................................................................12

Installation ..................................................................................................... 16

Slide Valve Actuator Installation & Calibration ............................................28

Slide Valve Operation ................................................................................. 31

Slide Valve Actuator Trouble Shooting Guide ..............................................32

Operation Section .......................................................................................... 36

Notice on using Non -Vilter Oils .................................................................. 36

Operation ..................................................................................................37

Pre Start-Up Checklists ............................................................................... 45

Field Piping and Mechanical Requirements .................................................46

Field Wiring Requirements .........................................................................47

Stop Check Valve Operation .......................................................................48

Service ....................................................................................................... 49

Maintenance .............................................................................................. 80

Parts Section ..................................................................................................81

Gate Rotor ................................................................................................. 82

Shaft Seal ...................................................................................................86

Main Rotor ................................................................................................. 87

Slide Valve Cross Shafts and End Plate ........................................................ 89

Slide Valve Carriage Assembly .................................................................... 91

Actuator & Command Shaft ....................................................................... 95

Miscellaneous Frame Components .............................................................97

Replacement Tools ................................................................................... 101

VSM 301-701 Replacement Parts Section ...................................................... 104

Gaterotor Assembly ................................................................................. 105

Shaft Seal .................................................................................................108

Main Rotor, Slide Valve Cross Shafts & End Plate .......................................109

Slide Valve Carriage Assembly .................................................................. 113

Actuator & Command Shaft ..................................................................... 115

Actuator & Command Shaft ..................................................................... 116

Miscellaneous Frame Components ...........................................................117

Replacement Tools ................................................................................... 121

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.

The procedure described is a general recommendation for long term storage (over one month of no operation)

of Vilter Manufacturing packages and compressors. While this procedure is intended to cover most of the

commonly encountered situations, it is the responsibility of the installation rm and end user to address any

unusual conditions. We suggest using the accompanying Long Term Storage Log sheet for recording purposes

to validate the appropriate procedures.

Prior to start-up, Vilter recommends that a complete system pressure check be performed. Upon verication

of the system integrity, a comprehensive evacuation procedure should be completed to ensure a dry system

before gas is introduced. The oil circuit of any compressor is to be primed at initial start-up through the pre-

lube oil pump on screw compressors.

Warranty of the system remains in effect as described in Section 5, Product Warranty and Procedures.

* If the unit is designed for indoor duty, it must be stored in a heated building.

If the unit is designed for outdoor duty, and is to be stored outdoors, a canvas tarp is recommended for

protection until installation is imminent. Adequate drainage should be provided, by placing wood blocks

under the base skid, so that water does not collect inside the base perimeter or low spots in the tarp.

* All compressor stop valves are to be closed to isolate the compressor from the remainder of the system. All

other valves, except those venting to atmosphere, are to be open. It is essential that the nitrogen holding

charge integrity be maintained.

* Cover all bare metal surfaces (coupling, ange faces, etc.) with rust inhibitor.

* Desiccant is to be installed in the control panel. If the panel is equipped with a space heater, it is to be

energized. If the panel does not have a space heater, use a thermostatically controlled 50-watt light bulb.

Use an approved electrical spray-on corrosion inhibitor for panel components (relays, switches, etc.)

* All pneumatic controllers and valves (Fisher, Taylor, etc.) are to be covered with plastic bags and sealed with

desiccant bags inside.

* System and compressor pressures (unit is shipped with dry nitrogen holding charge approximately 5 psi

above atmospheric pressure) are to be monitored, on a regular basis, for leakage. It will be necessary to

add a gauge to monitor the system holding charge pressure. If a drop in pressure occurs, the source of

leakage must be found and corrected. The system must be evacuated and recharged with dry nitrogen to

maintain the package integrity.

* Motors – (NOTE: The following are general recommendations. Consult the manufacturer of your motor

for specic recommendations.)

1) Remove the condensation drain plugs from those units equipped with them and insert silica-gel into the

openings. Insert one-half pound bags of silica-gel (or other desiccant material) into the air inlets and outlets

of drip-proof type motors.

NOTE: The bags must remain visible, and tagged, so they will be noticed and removed when

the unit is prepared for service.

Long Term Storage Requirements

2) Cover the unit completely to exclude dirt, dust, moisture, and other foreign materials.

3) If the motor can be moved, it is suggested that the entire motor be encased in a strong, transparent plastic

bag. Before sealing this bag, a moisture indicator should be attached to the side of the motor and several

bags of silica-gel desiccant put inside the bag, around the motor. When the moisture indicator shows

that the desiccant has lost its effectiveness, as by a change in color, the bag should be opened and fresh

replacement desiccants installed.

Whenever the motor cannot be sealed, space heaters must be installed to keep the motor at least 10°F

above the ambient temperature.

NOTE: There is a potential for damage by small rodents and other animals that will inhabit

motors in search of warm surroundings or food. Due to this, a possibility of motor

winding destruction exists. Sealing motor openings should restrict access to the

motor.

4) Rotate motor and compressor shafts several revolutions (approximately 6) per month to eliminate at spots

on the bearing surfaces. If the compressor unit is installed, wired and charged with oil, open all oil line valves

and run the oil pump for 10 seconds prior to rotating the compressor shaft. Continue running the oil pump

while the compressor shaft is being turned to help lubricate the surfaces of the shaft seal.

Long Term Storage Requirements

COMPRESSOR

The Vilter Single Screw Compressor is a positive displacement, capacity and volume controlled, oil ooded,

rotary compressor which uses a single main screw intermeshed by two opposing gate rotors. Gas compression

occurs when the individual ngers of each gate rotor sweep through the grooves, or utes, of the main screw as

the screw rotates. Compression occurs from the time the screw ute is rst closed off by the gate rotor nger,

until the time when the screw ute has rotated to the point of lining up with the discharge port in the compres-

sor 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 can-

celled out also. Main shaft bearings have no net forces except the weight of the screw and the shaft assembly.

The compressors are comprised of three rotating assemblies: the main screw assembly and the two gate ro-

tor assemblies. Each of these rotating assemblies use a common bearing conguration 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 x 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 xing 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 ange, at the driven end of the unit. The

driven end of the compressor housing is ooded with gas at suction pressure. The gas enters the open end of

the main screw utes at the driven end, and becomes trapped in the screw ute as the screw rotates and the

gate rotor tooth enters the end of the ute. At this point, the compression process begins. Directly after the

screw ute 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 bear-

ings. The mechanical shaft seal housing also contains oiling ports to lubricate, cool and provide a sealing lm

of oil for the mechanical shafts seal. Excess oil ows through the check valves on the sealing bafe 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 ute of the main screw.

Once the gas is swept from the main screw ute through the discharge port, it passes into the discharge manifold

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

Description

The Vilter compressors feature the exclusive Parallex™ Slide System, which consists of a pair of slides for each

gate rotor assembly. These two independently operated slides are referred to as the capacity slide and the vol-

ume 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 ute and

closes off the end of the groove. In this situation, the maximum volume of gas is trapped in the screw ute 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

ute 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 ute 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 specic process set points. By continuously adjusting the

ow 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 efciency of the compressor by matching the gas pressure within the screw ute at the point of discharge

to the downstream process requirements. The volume ratio slide operates at the discharge end of the screw,

and acts to vary the position of the discharge port. When the slide is extended fully to the discharge end of the

screw (the 100% position), the compression process within the screw ute continues until the screw rotates

far enough for the ute to pass the end of the volume ratio slide. At this point, the screw ute lines up with the

discharge port and the compressed gas is expelled from the screw ute. 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 ute 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 capac-

ity 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 efciency is maximized. Proper positioning of the volume ratio slide prevents either over

compressing or under compressing of the gas within the screw ute. This allows the single screw compressor

to efciently handle a range of volume ratios from as low as 1.2 up to 7.0.

Description

Foundation

• The foundation must adequately support the weight of the compressor package, including vessels, oil coolers,

controllers, and all ancillary equipment. (See documentation for weight and dimension specications

• A detailed general arrangement drawing is provided with all packages. This drawing details foundation type,

mounting foot locations, grouting, and anchoring methods for the specic package.

• Vilter Mfg. recommends consulting a licensed architect to design a suitable foundation for the application.

• Foundations must be built of industrial-grade materials and conform to the appropriate building codes.

• Mount the unit in a location which allows adequate clearance around the unit for maintenance.

• The unit may be top-heavy so caution should be taken when lifting and moving the unit; See the “Rigging and

Lifting” documentation provided with the unit.

• The unit must be securely bolted to the foundation and shims should be used to level the unit for proper opera-

tion. Grouting must be used.

• The compressor should be rmly mounted to the package; isolation dampers should not be used between the

compressor and the package frame.

• Pipes and conduits are strictly “no step” areas and could be damaged if used as foot or handholds.

• Adequately support pipes, conduits, etc. to prevent both transmission of vibration and failure due to stress at

the anges. Suction and discharge lines must be supported with appropriate pipe hangers to prevent their

movement if they are disconnected from the compressor package. (See Table 1 below for Unit Weights.)

• In high-pressure screw compressor applications, package vibration and noise levels may be higher than those

found in standard refrigeration applications. In these cases, adequate foundation and proper installation are

vital to ensure trouble-free operation. Additional sound attenuation measures may also be needed.

Rigging and Lifting

Thank you for purchasing a gas compressor (the “Compressor”) from Vilter Manufacturing LLC (“Vilter”). Rigging

and Lifting a large piece of equipment like the Compressor is extremely dangerous.

**DISCLAIMER**

Notice

This rigging and lifting manual (this “Manual”) is provided to you as a courtesy by Vilter and is not intended to be a

comprehensive guide to rigging and lifting the Compressor. Vilter shall not be liable for errors contained herein or

for incidental or consequential damages (including any injury to persons performing the rigging or lifting) in con-

nection with the furnishing, performance, or use of this Manual. This Manual is only a set of suggestions and you

may not rely solely on the information contained in this Manual to conduct the lift. In addition, information in this

Manual is subject to change without notice.

Limited Warranty

The information is this Manual does not constitute any warranty as to the Compressor. The warranty provision

contained in the terms and conditions pursuant to which the Compressor was sold serves as the sole and exclusive

warranty.

Safety

To correctly and safely operate the Compressor, you must consult all of the documentation that was provided to

you with the purchase of the Compressor (including all information sheets, warning notices and any other docu-

ments). This Manual is not intended to summarize or supplant any directions regarding how to safely operate or

move the Compressor.

BEFORE LIFTING AND RIGGING THE COMPRESSOR

In order to minimize the inherent risk involved in rigging and lifting a large piece of equipment, before attempting

to lift the Compressor, the actions of all parties involved in the lift must be carefully planned.

The following is provided merely to encourage purchasers to think about all of the steps necessary to rig and lift

the Compressor. Vilter can neither anticipate all of the dangers involved in a particular lift, nor evaluate the par-

ticular capabilities of each of person who will participate in the lift.

Educate and Select Lift Participants

To rig and lift the Compressor in a safe manner, you will need to select experienced, trained people (“Participants”)

to take on (and successfully perform) at a minimum the tasks associated with each of the following positions:

• Crane Operator;

• Crane Owner;

• Lift Coordinator;

• Lift Engineer;

• Rigging Specialist;

• Riggers; and

• Safety Signaler.

Rigging and Lifting

Training curriculum for Participants, at a minimum, should include:

• A review of safe operating practices;

• A review of who each person is and their specic role in the lift;

• A tutorial on how to read lift charts;

• A demonstration on how to use and inspect rigging hardware;

• A review of the company’s general lift plans and procedures;

• A tutorial on hand signals normally used to communicate with crane operators (a copy of such hand signals

may be obtained from machine safety vendors); and

• A review of the Compressor’s specic rig and lift plan (the “Plan”) (developed by the Lift Coordinator and Lift

Engineer); please see the section immediately below entitled “Create and Communicate the Plan.”

Individuals participating in the lift should fully understand the scientic principles pursuant to which a successful

lift is dependent—for example, center of gravity, equilibrium, and mechanics of load stabilization, critical angle

considerations and force.

All Participants should undergo a tness-for-duty program, including drug testing and medical examinations.

Create and Communicate the Plan

Well in advance of the planned lift date, lift planning meetings and hazard assessment meetings should be held

with all Participants in attendance. In addition, the Plan should be nalized and distributed for review and com-

ment.

The Plan should clearly dene requirements, expectations and specications for lifting the Compressor. At a mini-

mum, the Plan should include:

• Standard lifting and rigging procedures in place at the lift site (including proper classication of the lift as a

“critical lift” a “serious lift” or a “standard lift”);

• Drawings of the Compressor;

• A description of the lifting task;

• An evaluation of the hazards;

• The rigging plan and sketches of rigging to be attached to the Compressor;

• The roles and responsibilities of all Participants;

• An emergency plan; and

• The contact information of the Plan preparer

It is important to conrm that each Participant understands both the broader Plan and their specic responsibilities

during the lift. Participants should be encouraged to contact the Plan preparer at any time if they have questions.

In addition, the Plan preparer should be on-site during the lift to ensure that the lift is being executed in accor-

dance with the Plan. Finally, well in advance of the lift date, it should be conrmed that all necessary permits have

been obtained.

Inspect and Use the Appropriate Lifting Equipment

Verify Crane Operator and Crane Owner Credentials

Prior to rigging and lifting the Compressor, certain precautions should be taken with regards to the crane, the

crane operator and the crane owner.

• The lift capacity of the crane must exceed the Compressor’s weight;

• Conrm that the crane operator is qualied to work on the site;

• Get third-party conrmation that the crane owner and the crane operator are in compliance with applicable

laws, regulations and internal safety standards;

• Consult with the crane owner to determine if any site preparation is required for outriggers—improper use of

outriggers is a signicant cause of crane failure;

• Determine the level of supervision to be supplied by the crane owner; and

• Review all crane maintenance and inspection records, including without limitation, the crane log book, main-

tenance records, inspection reports and the physical condition of the crane.

Take all Appropriate Measurements

• Understand and interpret the load charts;

• Review all Compressor drawings for unit size, weight, center of gravity and other specications;

• Communicate incident response procedures in writing prior to the lift and verbally immediately before the lift;

• Determine the initial position, nal position, orientation and elevation of the Compressor;

• Ensure that adequate space is provided to safely assemble, erect, and operate the crane and materials (such as

timber mats, cribbing and blocks);

• Identify and communicate to all Participants the access points, lift radius, swing radius, clearances, and ob-

structions;

• Eliminate hazards and obstructions that may interfere with moving the Compressor; and

• Inform all Participants of water lines, sewer lines, power lines and other obstructions.

Use Proper Rigging Methods

• Determine diameter, length and quantity of necessary rigging hardware (design and detail the rigging hard-

ware to suit lifting the Compressor at the supplied pad eyes);

• Review and inspect all hoisting, lifting and rigging equipment;

• Select shackle size and prepare sketches or drawings for rigging;

• Use proper, conservative rigging techniques—including spreader beams—needed to lift the Compressor;

• Pad sharp corners, check the orientation of chocker hitches and the orientation of hooks;

• Prevent the binding of hoist rings; and

• Verify pad eye information.

TEST AND BALANCE THE COMPRESSOR

It is essential to test and balance the compressor before executing the actual lift in order to identify potential

causes of injury to Participants and the Compressor.

Secure Rigging and the Lift Site

• Reiterate that no one should walk under the raised load;

• Secure and restrict access to the lift area (consider vacating all non-essential personnel from the area);

• Provide qualied supervision for the duration of the lift;

• If applicable, assess the weather conditions and decide if it is safe to proceed;

• Stop the lift when any potentially unsafe conditions are recognized; and

• Ensure there are open channels for communications during the pre-lift, lift and post-lift phases (radio commu-

nications should be used if a direct line of sight is not possible).

Test and Balance the Compressor before the Lift

• Slowly raise the crane to take slack out of the rigging without actually lifting the load;

• Allow the rigging gear to settle into place;

• Check for twists and binds;

• Verify that all padding has remained in place and that all slings are protected from sharp edges;

• Begin to raise the load to verify balance and check the braking system; and

• If the Compressor is not balanced, lower and adjust as necessary.

Rigging and Lifting

CONTACT VILTER

While Vilter will not offer any specic feedback on the Plan or provide a specic Plan for rigging and lifting the

Compressor, Vilter may be able to answer questions about the Compressor that are important in developing your

Plan.

Please contact Vilter at:

P.O. Box 8904

5555 S Packard Ave

Cudahy, WI 53110-8904

Telephone: 1-414-744-0111

Fax: 1-414-744-3483

email: info.vilter@emerson.com

www.vilter.com

Installation

I. DELIVERY INSPECTION

Vilter screw compressor components are thor-

oughly inspected at the factory, assuring the

shipment of a mechanically perfect piece of equip-

ment. Damage can occur in shipment, however.

For this reason, the units should be thoroughly

inspected upon arrival. Any damage noted should

be reported immediately to the transportation

company. This way, an authorized agent can ex-

amine 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 ofce

should be notied of any claim made.

TABLE 1. UNIT WEIGHTS (LBS)*

MODEL STANDARD ECON-O-

MIZER

VSM 71 2,750 2,750

VSM 91 2,750 2,750

VSM 101 2,750 2,750

VSM 151 2,750 2,750

VSM 181 2,750 2,750

VSM 201 2,750 2,750

VSM 301 2,850 2,850

VSM 361 2,850 2,850

VSM 401 2,850 2,850

VSM 501 4,000 4,000

VSM 601 4,500 4,500

VSM 701 5,000 5,000

VSS 451 4,000 4,000

VSS 601 4,500 4,500

VSS 751 5,300 5,300

VSS 901 5,300 5,300

VSS 1051 6,600 6,600

VSS 1201 6,700 6,700

VSS 1501 10,010 10,010

VSS 1801 10,010 10,010

VSS 1551 11,000 11,000

VSS 1851 11,000 11,000

VSS 2101 11,000 11,000

* Does not include motor.

II. FOUNDATIONS

Vilter single screw compressor units are basi-

cally vibration free machines, therefore, no

elaborate foundations are necessary. The

oor or foundation upon which the unit will

be placed should be designed to support the

entire operating weight of the unit. See Table

1 for unit weights.

III. LOCATING UNIT - DRIVE

COUPLING ALIGNMENT

The single screw compressor units are shipped

with all major components mounted on struc-

tural steel. Place the entire unit on the oor

on a concrete pad and securely bolt in place.

Review local codes and ASHRAE Safety Code for

Mechanical Refrigeration. Bolt holes are located

in the unit’s mounting feet. When locating the

unit, provide adequate space for service work.

When the compressor unit is in place on the con-

crete pad, check both lengthwise and crosswise

to assure it is level. Use shims and wedges as

needed under the mounting feet to adjust the

level of the unit.

On single screw units, the motor and compres-

sor have been roughly aligned at the factory.

The coupling center section was shipped loose

to allow a check of proper electrical phasing,

direction of rotation of the motor and final

coupling alignment. The dial indicator align-

ment method is recommended. Final alignment

should be within 0.004 inches total indicator

reading in all direction for the VSS models and

0.010 inches for the VSM models.

IV. SYSTEM PIPING

Refer to the ANSI/ASME B31.5 Code for Refrig-

eration Piping. All compressor oil supply and oil

return piping has been completed at the factory.

The necessary connections to be made to the

screw compressor unit will vary depending on

the type of oil cooling method purchased. Main

line refrigerant suction and discharge connec-

tions are always necessary.

Care must be taken to avoid trapping the lines

except for specic purposes. When traps are

Installation

used, the horizontal dimensions should be as

short as possible to avoid excessive oil trapping.

Lines for ammonia systems must be of steel pipe

with specially designed ammonia service ttings.

Common pipe ttings must NEVER be used as

they will not provide the same service. 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 tting should be carefully cleaned to remove

all traces of grease or oil. Threads should then be

wiped dry with a lintless cloth. Only thread ll-

ing compounds suitable for refrigeration 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 rst two threads

to prevent any of the 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.

It is important to avoid short, rigid pipe lines that

do not allow any degree of exibility. This must

be done to prevent vibration being transmitted

through the pipe lines to the buildings. One

method of providing the needed exibility to

absorb the vibration is to provide long lines that

are broken by 90° Ells in three directions.

Smaller Halocarbon and Hydroflourocarbon

installations use copper pipes with solder type

ttings where possible. The use of screw type

ttings in Halocarbon systems should be held

to an absolute minimum, as these refrigerants,

due to their physical properties, will leak through

screw type joints.

When drawn copper tubing is used for Halocar-

bon lines, type “K” or “L” conforming to ASTM

B88 should be used. Soft annealed copper tub-

ing conforming to ASTM B280 can also be used

for tube sizes not larger than 1-3/8” in outside

diameter. These requirements are in accordance

with the mechanical code for refrigeration ANSI

B9.1-1971. The type of copper tubing to be used

for a given pressure is dependent on the strength

of the copper at the design temperature. Some

local codes forbid the use of Type “L”. Therefore,

before installation, be sure to check local require-

ments. Never use type “M” as it does not have

adequate wall thickness to withstand the operat-

ing pressures. In selecting ttings for Halocarbon

piping, only wrought copper ttings should be

used. Cast ttings 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 ttings are available and these may

be used with complete safety.

In larger pipe sizes, wrought ttings are not avail-

able. However, specially tested cast ttings are

available and these may be used with complete

safety.

When soldering copper tubing joints, only silver

solder should be used for Refrigerant-22 service.

Soft solder such as “50-50” should never be used,

as its melting point is too low, lacks mechanical

strength, and tends to break down chemically in

the presence of moisture.

A second method would be to install exible

pipe couplings as close to the compressor unit

as possible with connections run in two different

directions, 90° apart. These exible 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 pro-

longed 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.

Water supply and drain connections, and equip-

ment using water, should be installed so all the

water may be drained from the system after

the plant has been shut down in cold weather.

These precautions will avoid costly damage to

the equipment due to freezing.

This information is taken from ASHRAE 15-89 and

ANSI B31.5. The installing contractor should be

thoroughly familiar with these codes, as well as

any local codes.

V. ELECTRICAL CONNECTIONS

The single screw compressor units are shipped

with all package mounted controls wired. The

standard control power is 115 volts 60 Hertz,

single phase. If a 115 volt supply is not available, a

control transformer may be required. The power

source must be connected to the control panel

according to the electrical diagrams.

The units are shipped without the compressor

motor starter. Field wiring is required between

the eld mounted starters and package mounted

motors.

Additional control wiring in the eld is also re-

quired. Dry contacts are provided in the control

panel for starting the screw compressor motor.

These contacts are to be wired in series with the

starter coils. A current transformer is supplied

along with the compressor unit, and is located

in the motor junction box. This transformer is to

be installed around one phase of the compres-

sor motor starter. A normally open auxiliary

contact from the compressor motor starter is

also required.

Terminal locations for this wiring can be found

on the wiring diagram supplied with this unit.

Additional aspects of the electrical operation of

the single screw units are covered in the start up

and operation section of this manual.

VI. TESTING REFRIGERATION

SYSTEM FOR LEAKS

Vilter equipment is tested for leaks at the fac-

tory. One the most important steps in putting a

refrigeration system into operation is eld test-

ing for leaks. This must be done to assure a tight

system that will operate without any appreciable

loss of refrigerant. To test for leaks, the system

pressure must be built up. Test pressures for

various refrigerants are listed in ANSI B9.1-1971

code brochure entitle “Safety Code for Mechani-

cal Refrigeration”. These pressures will usually

sufce, however, it is advisable to check local

codes as they may differ. Before testing may

proceed, several things must be done.

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 regula-

tors by the manual lifting stems. All bypass

arrangements must also be opened. Because

of differences in characteristics of the various

refrigerants, two different testing methods are

necessary.

A. Ammonia Systems

Dry nitrogen may be used to raise the pressure

in an ammonia system to the proper level for

the test. The gas may be put into the system

through the charging valve or any other suitable

opening. Adjust the pressure regulator on the

bottle to prevent over-pressurization. Do not

exceed the pressure rating on the vessel with

the lowest pressure rating.

Carbon Dioxide should NOT be used as a test-

ing gas in a system where ammonia is already

dissolved in any moisture remaining. This will

cause ammonium carbonate to precipitate

when the CO2 is added. If heavy enough, this

precipitate may cause the machine to freeze

and clog the strainer.

A mixture of four parts water to one part liquid

soap, with a few drops of glycerin added, makes

a good solution. Apply this mixture with a one

inch round brush at all anges, threaded joints,

and welds. Repair all visible leaks. If possible,

leave the pressure on over night. A small pres-

sure drop of 5 lbs. Over this period indicates a

very tight system.

Remember to note the ambient temperature,

as a change in temperature will cause a change

in pressure.

After the system is thoroughly tested, open

all valves on the lowest part of the system so

the gas will oat away from the compressor.

Installation

This prevents any dirt or foreign particles from

entering the compressor and contaminating the

working parts. The oil should then be charged

into the compressor.

Charge a small amount of ammonia into the sys-

tem and pressurize the system to its respective

design pressure. Pass a lit sulfur stick around all

joints and connections. Any leaks will be indi-

cated by a heavy cloud of smoke. If any leaks are

observed during this test, they must be repaired

and rechecked before the system can be consid-

ered tight and ready for evacuation.

B. Halocarbon Refrigerant Systems

“Oil pumped” dry nitrogen, or anhydrous CO2 in

this order of preference may be used to raise the

pressure to the proper level for testing.

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 at-

tempt 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” the system may

be tested with refrigerant.

Attach a drum of the refrigerant to be used in the

system and allow the gas to enter until a pressure

of 5 psig is reached.

Remove the refrigerant drum and bring the

pressure to the recommended test level with oil

pumped dry nitrogen or CO2. Then check the

entire system again for leaks, using a halide torch

or electronic leak detector. Be sure to check all

anged, 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.

C. Evacuating The System

A refrigeration system operates best when only

refrigerant is present. Steps must be taken to

remove all air, water, vapor, and all other non-

condensables from the system before charging it

with refrigerant. A combination of moisture and

refrigerant, along with any oxygen in the system,

can form acids or other corrosive compounds that

corrode internal parts of the system.

To properly evacuate the system, and to remove

all non-condensables, air and water vapor, use a

high vacuum pump capable of attaining a blanked

off pressure of 50 microns or less. Attach this

pump to the system and allow it to operate until

system pressure is reduced somewhere below

1000 microns. Evacuation should not be done

unless the room temperature is 60F or higher.

Attach vacuum gauge(s), reading in the 20 to

20,000 micron gauge range, to the refrigerant

system. These gauge(s) should be used in con-

junction with the high vacuum pump. The read-

ing from the gauge(s) indicates when the system

has reached the low absolute pressure required

for complete system evacuation.

Connect the high vacuum pump into the re-

frigeration system by using the manufacturer’s

instructions. Connect the pump both to the high

side and low side of the system, to insure system

evacuation. Attach the vacuum gauge to the

system in accordance with the manufacturer’s

instructions.

A single evacuation of the system does not satis-

factorily remove all of the non-condensable, air

and water vapor. To do a complete job, a triple

evacuation is recommended.

When the pump is rst turned on, bring system

pressure to as low a vacuum level as possible, and

continue operation for 5 to 6 hours.

Stop the pump and isolate the system. Allow

the unit to stand at this vacuum for another 5 to

6 hours. After this time, break, the vacuum and

bring the system pressure up to 0 psig with dry

nitrogen.

Installation

To begin the second evacuation, allow the pump

to operate and reduce the pressure again to

within 50 to 1000 microns. After this reading is

reached, allow the pump to operate 2 or 3 hours.

Stop the pump and let the system stand with

this vacuum. Again using dry nitrogen, raise the

system pressure to zero.

For the third evacuation, follow the previous

procedure with the pump operating until system

pressure is reduced below the 1000 micron level.

Run the pump an additional 6 hours and hold the

system for approximately 12 hours at low pres-

sure. After this, again break the vacuum with dry

nitrogen and allow the pressure in the system

to rise slightly above zero pounds (psig). Install

new drier cartridges and moisture indicators.

Charge the system once more below the 1000

micron level and use the refrigerant designed

for the system.

When properly evacuating the system as outlined

above, the system is dry, oxygen-free and free of

non-condensables. The piping should not be in-

sulated before the evacuation process is started.

If moisture is in the system before evacuating, it

condenses in low places and freezes. If this hap-

pens, it can be removed by gently heating the

trap farthest away from the vacuum pump. This

causes the ice to melt and water to boil. Water va-

por collects in the next trap towards the vacuum

pump. This process should be repeated until all

pockets of water have been boiled off, and the

vacuum pump has had a chance to remove all the

water vapor from the system.

VII. UNIT OIL CHARGING

The compressor unit is shipped from Vilter with

no oil charge. The initial oil charge can be made

through the drain valve at the oil receiver/separa-

tor. Vilter motor driven and manually operated

oil chargers are available for this purpose. Once

the unit has been started and is operating above

50% capacity, oil may have to be added to bring

the oil level to the normal operating point. With

the unit operating, oil should be added through

the charging connection at the suction strainer.

The normal operating level is between the (2)

sight glasses on the oil separator. See Table 2 for

approximate oil charge requirements.

TABLE 2. OIL CHARGE

Oil Separator Size Approximate Oil

Charge (Gallons)

VSR 16” 20 to 27

VSR 20” 22 to 31

VSM 20” 20 to 25

VSM 30” 30 to 35

20” 30 to 40

24” 40 to 50

30” 60 to 75

36” 95 to 105

42” 145 to 165

The oil level may be above the top sight glass

at this time. Later, when the unit is placed in

operation, there will be some drop in the oil level

as the various oil lines, oil lter and other piping

becomes charged with the normal amount of

oil that will be in circulation. This drop in oil

level should bring the level in the oil receiver/

separator into the normal operating range. Do

not mix oils.

A. 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 per-

formed, we are able to offer refrigerant specic

lubricating oils. Use of oil not specied or sup-

plied by Vilter will void the compressor warranty.

Please contact your local Vilter representative or

the Home Ofce for further information.

VIII. SYSTEM REFRIGERANT CHARGING

CAUTION

When charging the system, make sure the

compressor unit is pressurized from the dis-

charge side of the compressor. Pressurizing the

compressor from the suction side may cause

rotation of the compressor, without oil supply,

which could lead to internal damage.

Installation

After the system is leak-free and evacuation has

been completed, it is ready for charging. Before

actual charging, however, the entire operation

of the refrigeration system should be inspected

as outlined below:

A. Low Side Equipment

1. Fans on air handling equipment running.

2. Pumps on water cooling equipment run-

ning.

3. Proper location and attachment of thermo-

static expansion valve bulb to suction line.

4. Correct fan and pump rotation.

5. Evaporator pressure regulators and solenoid

valves open.

6. Water pumps and motors correctly aligned.

7. Belt drives correctly aligned and tensioned.

8. Proper voltage to motors.

B. Compressors

1. Proper oil level.

2. Voltage agrees with motor characteristics.

3. Properly sized motor fuses and heaters.

4. Direct drivers aligned and couplings tight.

5. All suction and discharge valves open.

6. All transducers and RTD’s calibrated and

reading correctly.

C. Condensers

1. Water available at water cooled condensers

and supply line valve open.

2. Water in receiver of evaporative condenser

and makeup water available.

3. Correct rotation of pump and fan motors.

4. Belt drives aligned and tensioned correctly.

5. Pump, fans and motors lubricated.

D. Controls

Controls should be at the initial set points. See

microprocessor manual for further information.

E. Initial Charging – High Side Charging

There are two methods of charging refriger-

ant into the system, through the “high side” or

through the “low side”. High side charging is

usually used for initial charging as lling of the

system is much faster. Low side charging is

usually reserved for adding only small amounts

of refrigerant after the system is in operation.

High side charging of refrigerant into the system

is accomplished as follows:

1. Connect a full drum of refrigerant to the

liquid charging valve. This valve is gener-

ally located in the liquid line immediately

after the king or liquid line valve. Purge the

air from the charging line.

2. Invert the refrigerant drum if the drum is

not equipped with “Liquid” and “Vapor”

valves, and place in such a position so the

liquid refrigerant only can enter the sys-

tem. Close the liquid line or king valve, if

it is not already closed. Open the “Liquid”

charging valve slowly to allow refrigerant

to enter the system. The vacuum in the

system will draw in the refrigerant.

It is important that, during this operation,

air handling units be running and water is

circulating through the chillers. The low

pressures on the system can cause the

refrigerant to boil at low temperature and

possibly freeze the water if it is not kept

circulating.

Water freezing in a chiller can rupture the

tubes and cause extensive damage to the

system. It would be desirable to charge

the initial amount of refrigerant without

water in the shell and tube equipment to

eliminate the possibility of freeze up.

3. After some refrigerant has entered the

system, the compressor unit starting pro-

cedure may be followed. See Start-Up and

Operation Section of this manual.

4. Continue charging refrigerant into the

system until the proper operating require-

ments are satised. Then, close the liquid

charging connection and open the liquid

line valve allowing the system to operate

normally. To check that enough refriger-

ant has been added, the liquid sight glass

Installation

should show no bubbles, and there will be a

liquid seal in the receiver. If these two condi-

tions are not satised, additional refrigerant

must be added.

5. When sufficient refrigerant has been

charged into the system, close the charging

and drum valves. Then remove the drum

from the system.

6. During the charging period, observe the

gauge carefully to insure no operating dif-

culties. Watch head pressures closely to

make sure the condensers are functioning

properly.

Since it is usually necessary to use several drums

when charging a system, follow the procedures

in paragraphs E1 and E2 of the above description

when attaching a new drum. After charging,

the refrigerant drums should be kept nearby for

several days as it is sometimes necessary to add

more refrigerant as the system “settles down”.

IX. MAINTENANCE SUGGESTIONS

Careful checking of a refrigeration system for

leaks and proper operation of all components

upon installation will start the system on its way

to a long life of satisfactory service. To ensure

the desired trouble-free operation, however, a

systematic maintenance program is a prereq-

uisite. The following maintenance schedule is

suggested.

A. Daily

1. Check oil levels.

2. Check all pressure and temperature read-

ings.

3. Check micronic oil lter inlet and outlet pres-

sures for excessive pressure drop. Change

lter when pressure drop exceeds 45 psi or

every six months, whichever occurs rst. For

proper procedure for changing micronic oil

lter and for charging oil into the system, see

Operation Section.

4. Clean strainers each time lter cartridge

if replaced.

5. Check compressor sound for abnormal

noises.

6. Check shaft seals for excessive oil leakage.

A small amount of oil leakage (approxi-

mately 10 drops/min) is normal. This

allows lubrication of the seal faces.

B. Weekly

(Items 1 thru 6 above plus 7 thru 9)

7. Check the refrigeration system for leaks

with a suitable leak detector.

8. Check oil pressures and review micropro-

cessor log and log sheets.

9. Check refrigerant levels in vessels.

C. Monthly

(Items 1 thru 8 above plus 9 thru 13)

10. Oil all motors and bearings. Follow manu-

facturer’s instructions on lubrication.

11. Check calibration and operation of all

controls, particularly safety controls.

12. Check oil cooler for any evidence of cor-

rosion, scaling or other fouling.

13. Operate compressor capacity and volume

ratio controls through their range both

automatically and manually.

D. Trimonthly

(About 2000 operating hours)

Check movement of compressor rotor at drive

coupling end to determine bearing oat. (Re-

fer to Service Section.)

E. Yearly

(Items 1 thru 13 and “D” above plus 14

thru 28)

14. Check entire system thoroughly for leaks.

Installation

15. Remove all rust from equipment, clean and

paint.

16. Flush out sediment, etc. from water circuits.

17. Clean all oil strainers.

18. Clean suction strainer – compressors.

19. Check motors and fans for shaft wear and

end play.

20. Check operation and general condition of

microprocessor and other electrical con-

trols.

21. Clean all water strainers.

22. Check drains to make sure water will ow

away from equipment.

23. Drain and clean entire oil system at receiver

drain. Recharge with new clean moisture

free oil. For proper procedure for changing

micronic oil lter and charging oil into the

system, see Start-Up and Operation section.

24. Check compressor coupling. For integrity

and alignment.

25. Check oil pump for wear.

26. Check the calibration of the microprocessor

pressure transducers and RTD’s for accu-

racy.

27. Check mounting bolts for compressor and

motor.

F. System Leaks

There are any number of reasons why leaks

develop in a refrigeration system (i.e. such as

drying out of valve packing, yielding of gaskets,

improper replacement of valve caps and loosen-

ing of joints due to vibration). For these reasons,

the need for periodic leak testing cannot be over-

emphasized. Similarly, when any service opera-

tions are performed on the system, care should

be exercised to insure all opened flanges are

tightened, all plugs that were removed are re-

placed with a suitable thread lling compound,

all packing glands on valve stems are tightened,

and all valve caps are replaced. When operation

is restored, all joints opened or any valves moved

during the servicing should be checked for leaks.

G. Year Round Operation

On a continual basis:

1. Guard against liquid slugging of compres-

sor.

2. Maintain unit in clean condition and paint

as necessary.

3. Grease valve stems and threads for the

valve caps.

When refrigeration equipment is operated 24

hours a day year round, it is highly recommend-

ed that a yearly check of all internal parts be

made (see Service Section). While the highest

material standards are maintained throughout

all Vilter compressors, continuous operation

and any presence of dirt may prove injurious to

the machine. To forestall needless shutdowns

or prevent possible machine breakdowns, the

side covers should be removed yearly, and a

visual inspection be made of the internal parts.

In this way, a small amount of time spent check-

ing machine conditions once a year may prevent

extensive shutdowns later with subsequent

product loss and expensive repairs.

Installation

Stop Check Valve Installation

Installation:

The new design will apply only to the 2” thru 4” stop valves. Retrotting a eld installation will

require replacing the bonnet assembly.

The bonnet must be installed with the spring towards the bottom (see illustrations above).

The drill xture is designed so that the hole for the spring will always be drilled on the oppo-

site side from the cast-in Vilter name on the bonnet. From the outside of the valve, the casting

numbers must always be towards the top of the valve.

See Operation Section on Stop Check Operation.

Correct

Wrong Wrong

Correct

Verify the location of the Spring and note the Vilter name.

COUPLING INFORMATION

COUPLINGS INSTALLATION AND ALIGNMENT

These instructions are intended to help you to install

and align the coupling. Covered here will be general

information, hub mounting, alignment, assembly,

locknut torquing, discpack replacement, and part

numbers. The coupling as received, may or may not

be assembled.

*If assembled, the locknuts are not torqued.

*If coupling is assembled, remove the bolts that at-

tach the hubs to the disc packs. Remove both hubs.

Leave the disc packs attached to the center member.

A. Hub Mounting:

1. Clean hub bores and shafts. Remove any nicks

or burrs. If bore is tapered, check for good contact

pattern. If the bore is straight, measure the bore

and shaft diameters to assure proper t. The key(s)

should have a snug side-to-side t with a small

clearance over the top.

NOTE: If the hub position on the shaft does not allow

enough room to install the short bolts in the hub after

hub mounting, install the bolts and disc pack before

mounting hub on shaft.

B. Straight Bore:

1. Install key(s) in the shaft. If the hub is an interfer-

ence t, heat the hub in an oil bath or oven until

bore is sufciently larger than the shaft. 350º F.

is usually sufcient. An open ame is not recom-

mended. However, if ame heating is necessary,

use a very large rose bud tip to give even heat

distribution. A thermal heat stick will help deter-

mine hub temperature. DO NOT SPOT HEAT THE

HUB OR DISTORTION MAY OCCUR. With the hubs

expanded, slide it up the shaft to the desired axial

position. A pre-set axial stop device can be helpful.

C. Taper Bore:

1. Put the hub on the shaft without key(s) in place.

Lightly tap hub up the shaft with a soft hammer.

This will assure a metal-to-metal t between shaft

and hub. This is the starting point for the axial

draw. Record this position between shaft and hub

face with a depth micrometer. Mount a dial indica-

tor to read axial hub movement. Set the indicator

to “0”. Remove hub and install key(s). Remount

hub, drawing it up the shaft to the “0” set point.

Continue to advance hub up the taper to the de-

sired axial position. Use the indicator as a guide

only. A pre-set axial stop device can be helpful.

Check the nal results with a depth micrometer.

The hub may have to be heated in order to reach

the desired position on the shaft. DO NOT SPOT

HEAT THE HUB OR DISTORTION MAY OCCUR.

Install shaft locknut to hold hub in place.

D. Shaft Alignment.

Move equipment into place.

1. Soft Foot. The equipment must sit at on its

base (+/- 0.002 inches). Any soft foot must be

corrected now.

2. Axial Spacing. The axial spacing of the shafts

should be positioned so that the disc packs (ex-

ing elements) are flat when the equipment is

running under normal operating conditions. This

means there is a minimal amount of waviness in

the disc pack when viewed from the side. This

Coupling Installation

will result in a exing element that is centered and

parallel to its mating ange faces. Move the con-

nected equipment to accomplish the above.

NOTE: The disc pack is designed to an optimal thick-

ness and is not to be used for axial adjustments.

See documentation that came with the coupling for

complete specications.

3. Angular Alignment. Rigidly mount a dial indicator

on one hub or shaft, reading the face of the other

hub ange, as shown on next page. Rotate both

shafts together, making sure the shaft axial spacing

remains constant. Adjust the equipment by shim-

ming and/or moving so that the indicator reading

is within .002 inch per inch of coupling ange.

4. Parallel Offset. Rigidly mount a dial indicator on

one hub or shaft, reading the other hub ange out-

side diameter, as shown in Figure 3. Indicator set-up

sag must be compensated for. Rotate both shafts

together. Adjust the equipment by shimming and/

or moving so that the indicator reading is within

.002 inch per inch of the axial length between ex

elements. See drawing below.

Note: If the driver or driven equipment alignment

specication is tighter than these recommendations,

the specication should be used. Also, be sure to

compensate for thermal movement in the equipment.

The coupling is capable of approximately four time

the above shaft alignment tolerances. However, close

alignment at installation will provide longer service

with smoother operation.

E. Final assembly

With the coupling in good alignment the bolts will t

through the holes in the anges and the disc packs

more easily.

1. If the coupling arrived assembled, the disc packs

are still attached to the center ring. Before tak-

ing the discs packs off, rst install one hub bolt

through each disc pack and secure with lock out.

This will help when the pack is reinstalled late. If

the coupling was shipped disassembled, the bolt

through the pack is not required as the discs in the

pack are factory taped together.

2. Remove the long bolts. Mount the disc packs

on the hubs with one bolt through the disc pack

aligned with a clearance hole in the hub. Install

the short bolts through the hub, disc pack, bevel

washer or link, and secure with a lockout.

NOTE: All bolt threads should be lubricated. A clean

motor oil is recommended. On size 226 and larger, a

link must be put on bolt rst. Remove the disc pack

alignment bolt. Proceed to mount the second disc

pack to the other hub in the same way.

3. Position one set of short bolts in each hub on

top. Now slide the center ring down into place

straddling the short bolts with the center ring

bushings. If coupling is dynamically balanced, the

center ring match marks must lineup with both

hub match marks. When one bushing is in-line

with the hole in the disc pack, slide one long bolt

through washer or link, disc pack, center ring,

disc pack, washer or link, and then secure with a

locknut. On size 226 and larger a link must be put

on the bolt rst. Now install the rest of the long

bolts in the same manner.

4. Torque the long bolt locknuts at this time.

Note: Alignment of C-Flange Units should be

checked when compressor or motor are replaced.

Installation

NOTE: With the coupling in good alignment, the bolts

will t through the holes in the anges and the disc

pack more easily. It is recommended that all locknuts

be retightened after several hours of initial operation.

5. For further help with the installation or align-

ment, consult Rexnord.

F. Disc Pack Replacement.

If it becomes necessary to replace the disc pack, it can

be done as follows:

1. Remove all the long bolts and lower the center

ring by sliding it our from between the two disc

packs.

2. Remove one short bolt from the disc pack/hub

connection and reinstall it through a hub clearance

hole and into the hole in the disc pack. Put the nut

on. This will keep the discs together and maintains

the disc orientation for later reinstallation. Remove

the rest of the short bolts and takeoff the disc pack.

Repeat for the second disc pack.

3. Replace the pack(s) if required. Recheck align-

ment per Section D. Reassemble per Section E.

Installation

Slide Valve Actuator Installations 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. Briey, 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 ro-

tational 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 electri-

cal 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 pick-

ing 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 gear-

motors on early units, you must remove the capaci-

tors 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 actua-

tors 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 uctuate 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.

Slide Valve Actuator Installation & Calibration

Caution: there are wires attached to the con-

nector 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 specications.

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 but-

ton on the actuator one time. This plac-

es the actuator in calibration mode. The

r e d L E D w i ll b eg i n f l a s h i ng r ap 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 uctuate during calibra-

tion. 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 con-

trol 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 “mechani-

cal stop” position. Do not continue to run the

actuator in this direction after the slide valve

has reached the stop. Doing so may cause dam-

age to the actuator or the slide valve. When

the slide has reached the mechanical stop posi-

tion, 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 ash

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” posi-

tion. 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 actua-

tor 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

ashing. 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 milli-

volt readout on the control panel screen. Discon-

tinue 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.

Slide Valve Actuator Installation & Calibration

21. Use the INC button to rotate the actuator to-

wards 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 mil-

livolts for the 2783J qualied 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 qualied 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).Ad-

just 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 calibra-

tion and exit the “Slide Calibration” screen.

The controller will automatically energize

the actuator and drive it back to its mini-

mum 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 go-

ing to the “Setup” menu and choosing “Alarm

Enable” for the “Slide Non-Movement Option”.

29. This completes the calibration for this chan-

nel either capacity or volume. Repeat the

same procedure to the other channel.

Slide Valve Actuator Installation & Calibration

Slide Valve Actuator Operation

The slide valve actuator is a gear-motor with a posi-

tion 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 mo-

tor turns. On the shaft of the motor is a small alumi-

num “photochopper”. It has a 180 degree fence that

passes through the slots of two slotted optocouplers.

The optocouplers have an infrared light emitting di-

ode (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 al-

ternately blocks and opens the optocoupler slots,

generating a sequence that the position sensor mi-

crocontroller 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 posi-

tion 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 ac-

tuator will become lost.

A brake failure can sometimes be detected by the

position sensor. If the motor never stops turning after

a power loss, the position sensor detects this, knows

it will be lost, and goes immediately into calibrate

mode when power is restored.

Slide Valve Operation

The actuator cannot be cali-

brated

The actuator goes into cali-

bration mode spontane-

ously

The actuator goes into cali-

bration mode every time

power is restored after a

power loss

Dirt or debris is blocking one or

both optocoupler slots

The photochopper fence extends

less than about half way into the

optocoupler slots

The white calibrate wire in the grey

Turck cable is grounded

Dirt and/or condensation on the

position sensor boards are causing

it to malfunction

The 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 white calibrate wire in the grey

Turck cable is grounding intermit-

tently

A very strong source of electromag-

netic 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 work-

ing properly (see theory section

above.)

Clean the optocoupler slots

with a Q-Tip and rubbing alco-

hol.

Adjust the photochopper so

that the fence extends further

into the optocoupler slots.

Make sure the motor brake

operates freely and the pho-

tochopper will not contact the

optocouplers when the shaft is

pressed down.

Tape the end of the white wire

in the panel and make sure that

it cannot touch metal

Clean the boards with an elec-

tronics cleaner or compressed

air.

Try to free the stuck button.

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 actua-

tor.

Install additional metal shield-

ing material between the EMI

source and the actuator or

cable.

Replace the actuator.

Get the motor brake to where it

operates freely and recalibrate.

Replace the actuator.

Slide Valve Actuator Trouble Shooting Guide

Problem Reason Solution

The motor was manually moved

while the position sensor was not

powered.

The motor brake is not working

properly

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.

A motor bearing has failed

There is a loose connection in the

screw terminal blocks

There is a loose or dirty connec-

tion in the yellow Turck cable

The position sensor has failed

There is a broken motor lead or

winding

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

Recalibrate.

Get the motor brake to where it

operates freely and then recali-

brate.

Replace the actuator.

Try to realign or replace the ac-

tuator.

Adjust the photochopper so that

the fence extends further into

the optocoupler slots.

Replace the actuator.

Tighten.

Clean and tighten.

Replace the actuator.

The motor will resume opera-

tion when it cools. This could be

caused by a malfunctioning con-

trol panel. Consult the factory.

See above.

Free the command shaft.

Replace the actuator.

This could be caused by a mal-

functioning control panel. Con-

sult the factory.

The actuator does not trans-

mit the correct position after

a power loss

There is a rapid clicking noise

when the motor is operat-

ing

The motor operates in one

direction only

The motor will not move in

either direction

The motor runs intermittently,

several minutes on, several

minutes off

Slide Valve Actuator Trouble Shooting Guide

Problem Reason Solution

Bad thermal switch

Any of the reasons listed in “The

motor will not move in either direc-

tion”

Stripped gears inside the gear mo-

tor or the armature has come un-

pressed from the armature shaft

Replace the actuator.

See above.

Replace the actuator.

The motor runs sporadically

The motor runs but output

shaft will not turn

Slide Valve Actuator Trouble Shooting Guide

Problem Reason Solution

Slide Valve Actuators communicate problems discovered by internal diagnostics via LED blink codes. Only one blink

code is displayed, even though it is possible that more than one problem has been detected.

Flash Pattern Meaning

*=ON

_=OFF

*_*_*_*_*_*_*_*_*_*_*_ Calibration step 1

*___*___*___*___*___ Calibration step 2

*__*________________ This indicates a zero span. This error can only occur during calibration. The typical

cause is forgetting to move the actuator when setting the upper limit of the span.

If this is the case, press the blue button to restart the calibration procedure. This

error can also occur if either or both of the slotted optocouplers are not working. If

this is the case, the slide valve actuator will have to be replaced.

The operation of the slotted optocouplers is tested as follows:

1. Manually rotate the motor shaft until the aluminum photochopper fence is not

blocking either of the optocoupler slots.

2. Using a digital multi-meter, measure the DC voltage between terminal 3 of

the small terminal block and TP1 on the circuit board (see Note 1). You should

measure between 0.1 and 0.2 Volts.

3. Next, measure the DC voltage between terminal 3 and TP2 on the circuit

board. You should measure between 0.1 and 0.2 Volts.

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.

*__________________ 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 transmit-

ting 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 ther-

mal 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 opera-

tion) 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 oc-

curred 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.

Slide Valve Actuator Trouble Shooting Guide

Operation Section

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 ap-

plication 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.

Notice on using Non -Vilter Oils

OIL SYSTEM

A. Oil Charge

Charge the oil separator with the proper quantity of

lubricating oil (see Table 2 in the Installation Section).

CAUTION

It is imperative you charge the oil into the receiver/

separator prior to energizing the control panel to

prevent burning out the immersion heater in the

separator/receiver.

During operation, maintain the separator oil level

in the normal operating range between the two

bullseye sight glasses. If the oil level is visible only

in the lowest sight glass, add oil to the operating

compressor through the connection located at the

compressor suction inlet. Pump oil into the compres-

sor until the oil level in the separator is between the

two bullseye sight glasses. Watch this level carefully

to maintain proper operation. Never allow the oil to

reach a level higher than indicated on the highest

sight glass, since this may impair the operation and

efficiency of the oil separator portion of this combi-

nation vessel.

B. Oil Filter

Change the oil filter after the first 200 hours of opera-

tion, as noted on the hour meter. Thereafter, replace

the filter every six months, or when the oil pressure

drop through the filter reaches 45 psi, whichever oc-

curs first. The pressure drop across the filter is read

on the microprocessor panel. Check the pressure

drop and record it daily.

To prepare for the removal of the filter, shut down

the compressor. Isolate the filter housing appropri-

ately. If unit is equipped with duplex filter housings

the unit does not have to be shut down, however

the filter to be serviced must be isolated before the

tank can be opened.

1. Filter Removal, VSG Units using Vilter Part

 Number1833Coillterelements.

Release the pressure in the oil filter housing by

opening the bleed valves at the stop valve in the

block and bleed assembly, or at the bleed valve

for the oil filter housing. Be sure to follow all

Local, State, and Federal ordinances regarding

the recovery of refrigerants.

Drain the filter housing in to an appropriate

container and dispose of the oil in a appropriate

manner following all Local, State and Federal

ordinances regarding the disposal of used oil.

Unscrew the bolts holding the cover flange to

the tank. Remove the cover flange and spring

plate. Pull out the filter element(s). Before

reassembling, thoroughly clean the tank and

spring plate to lengthen the life span of the filter

element(s).

FIGURE 1.

1833C FILTER ELEMENT TANKS

To replace the filter element(s), on single ele-

ment tanks, insert the element and make sure

it fits onto the outlet connection. Install spring

plate, and bolt the cover assembly in place. On

units equipped with dual element tanks, insert

inner element and make sure it fits onto the

outlet connection. Put the centering piece on

the outer element and slide into tank making

sure the center piece fits into the inner element.

Put spring plate on outer element and bolt the

cover assembly in place.

Operation

1833C

Filter

Element

2. Filter Removal and installation, all

VSR Units.

Release the pressure in the oil filter housing by

opening the bleed valves at the stop valve in the

block and bleed assembly, or at the bleed valve

for the oil filter housing. Be sure to follow all Lo-

cal, State and Federal ordinances regarding the

recovery of refrigerants.

FIGURE 2.

TYPICAL CANISTER TYPE FILTER CROSS SEC-

TION

Drain the filter bowl or housing in to an appro-

priate container and dispose of the oil in a ap-

propriate manner following all Local, State and

Federal ordinances regarding the disposal of used

refrigeration oil.

Loosen and remove the locking ring on filter tank

by turning in a counter clockwise direction. Re-

move filter tank with the used element.

Remove the filter element from the tank. Be-

fore reassembling, thoroughly clean the tank to

lengthen the life span of the filter element.

Wet the threads and O-ring on the head and the

O-ring in the new element with clean refrigera-

tion oil.

CAUTION

Do not use a pipe wrench, hammer or any other tool

to tighten the locking ring.

nsert new element into the filter tank with

the open end visible. Attach tank to head and

HAND TIGHTEN the locking ring.

The filter housing can be evacuated and then

slowly pressurized to check for leaks before

returning to service.

3. Filter Removal, VSS and VSM Units

(after 5/1/00) when using Vilter Part

Numbers 3111A (16” Simplex), or

3112A (39” Simplex) oil filter

housings.

Release the pressure in the oil filter housing by

opening the bleed valves at the stop valve in

the block and bleed assembly, or at the bleed

valve for the oil filter housing. Be sure to follow

all Local, State and Federal ordinances regard-

ing the recovery of refrigerants.

Drain the filter bowl or housing in to an ap-

propriate container and dispose of the oil in a

appropriate manner following all Local, State

and Federal ordinances regarding the disposal

of used refrigeration oil.

Loosen and remove the cover on the bowl of

the filter tank by turning it in a counter clock-

wise direction. Remove the used element.

Wet the O-ring in the new element with clean

refrigeration oil. Insert the new element into

the filter tank with the closed end visible and

attach the cover to the bowl. HAND TIGHTEN

the cover.

The filter housing can be evacuated and then

slowly pressurized to check for leaks before

returning to service.

LOCKING

RING

FILTER

ELEMENT

FILTER

TANK

INLET

OUTLET

Operation

4. Filter Removal, VSS and VSM Units (after

5/1/00) when using Vilter Part Numbers

3109A (16” Duplex), or 3110A (39” Du

plex) oil filter housings.

Isolate the bowl to be worked on by turning

handle. The handle will cover the drain valve of

active element. Close commuter valve in center of

handle. Release the pressure in the isolated bowl

by bleeding through the stop valve on the oil filter

cover for Duplex (Vilter Part #3109A or 3110A),

or through the stop valve for the oil filter hous-

ing. Be sure to follow all Local, State and Federal

ordinances regarding the recovery of refrigerants.

Drain the filter bowl or housing in to an appro-

priate container and dispose of the oil in a ap-

propriate manner following all Local, State and

Federal ordinances regarding the disposal of used

refrigeration oil.

Loosen and remove the cover on the bowl of the

filter tank by turning it in a counter clockwise

direction. Remove the used element.

Wet the O-ring in the new element with clean

refrigeration oil. Insert the new element into the

filter tank with the close end visible and attach

the cover to the bowl. HAND TIGHTEN the cover.

The filter housing can be evacuated and then

slowly pressurized by opening the commuter

valve on handle. This will pressurize the housing.

Check for leaks. The filter can now be returned

to service. Repeat for other filter bowl if needed.

CAUTION

When changing filter, discard clogged filter only. Save

and reuse spring plate and centering piece. This filter

MUST be installed with the spring plate. A compressor

that is allowed to operate without the spring plate is

running with unfiltered oil.

The filter housing can be evacuated and then

slowly pressurized to check for leaks before re-

turning to service.

C. Oil Pressure Regulating

On units with a full time oil pump, the back pres-

sure regulator, in the oil supply line from the sepa-

rator, controls upstream pressure to the compres-

sor bearings and should be adjusted to hold the oil

pressure at 50 psig above suction pressure. Excess

oil not required for bearing lubrication is passed

through the regulator and flows into the separator.

D. Oil Cooling

Various types of oil coolers can be used to main-

tain the oil injection temperature, usually either

a water-cooled shell-&-tube heat exchanger

mounted locally or a remotely located air-cooled

fan-coil unit. In either case, the oil temperature

control valve operates the same. (See Appendix

A: Pre Start Up for Remote Oil Coolers)

A two-way ball valve is located in the main oil line

between the oil separator and the compressor.

The oil cooler is piped in parallel to the oil tem-

perature control valve, which acts as a by-pass

valve (Figure 3).

FIGURE 3.

TYPICAL WATER COOLED OIL COOLER DIAGRAM

1. Temperature Control Valve Installation

& Position Indication

1.1 The ball valve is installed with the ball

closed.

Operation

1.2 The actuator mounts on the ball valve stem.

Flats on the ball valve stem indicate the position

of the ball:

OPEN – stem flats are with the flow

CLOSED – stem flats are across the flow

1.3 On smaller valves, the ball valve stem flats

are nearly hidden between the stem extension

and the stem lock nut. The locking tabs on the

stem lock nut are across the flow.

1.4 The actuator position indicator stem flats

are oriented in the same direction as the ball

valve stem flats.

1.5 There is a mechanical position indicator on

the top of the actuator cover.

NOTE: The oil temperature control valve comes

from the vendor already assembled with the ball

closed and the actuator in the CLOSED position.

2. Control Action

2.1 The ball valve can rotate through a full 360°

arc.

2.2 The actuator restricts the ball to a 90° arc of

travel.

2.3 The actuator is powered (120V or 24V) all

the time.

2.4 The position target signal from the com-

pressor controller is a 4-20mA analog value.

2.5 There is no feedback position from the ac-

tuator.

3. Initial Position

3.1 With the electrical power to the valve de-

energized, the valve is set to its initial position

by ensuring that the ball is in the closed position

and that the actuator indicator displays CLOSED.

3.2 When the electrical power to the valve is

energized, the valve should rotate to fully OPEN.

4. Operation

4.1 When initially installed, the ball must be in

the closed position.

4.2 When electrically energized, if the compres-

sor is not running, the compressor controller will

turn the valve fully open (100%).

4.3 When the compressor starts, the valve

remains fully open (100%) until the oil injection

temperature rises above the control setpoint.

4.4 When the oil injection temperature rises

above the control setpoint, the oil temperature

control valve will begin to close.

4.5 The hot oil from the oil separator begins

to divert to the oil cooler, mixing the hot and

cooled oil flow streams together downstream

of the oil temperature control valve. The valve

can fully close (0%) diverting the entire oil flow

stream to the oil cooler.

4.6 As the oil injection temperature drops be-

low the setpoint, the oil temperature control

valve begins to open so that the oil injection

temperature does not become too cold.

4.7 When the compressor stops, the valve re-

turns to fully open (100%).

5. Fail Position

The actuator remains in its last position when

power is removed.

6. Screen Display

The oil temperature control valve, identified

as “OIL MIX” on the main HMI display screen,

shows a numerical value with “%” as units. This

is to be understood as “% OPEN.” It is a direct

indication of the position of the ball valve.

6.1 100% OPEN

oil flow stream is entirely bypassing the oil cooler

Operation

6.2 99% to 1% OPEN

oil flow stream is partially by-passing the oil

cooler and partially diverted to the oil cooler

6.3 0% OPEN

oil flow stream is entirely diverted to the oil

cooler

G. Control Settings

The oil temperature control setpoints are en-

tered on the compressor controller screen “Oil

Mixing Valve PID (Oil Return from Cooler)”.

8.0 Rotating the Actuator for Convenience of

Installation

The actuator can be rotated to any one of four

positions.

8.1 Remove both 120V and 24V power from the

actuator.

8.2 Disconnect electrical leads at actuator.

8.3 Remove four cap screws that fasten the

actuator to the valve mounting bracket.

8.4 Lift the actuator off the valve stem.

8.5 Rotate the actuator to the desired position.

8.6 Slide actuator down on the valve stem.

8.7 Secure the actuator to the valve mounting

bracket with four cap screws.

8.8 Re-connect the electrical leads at the actua-

tor.

8.9. Restore 120V and 24V power to the actuator.

NOTE: The ball valve and the actuator must al-

ways be assembled in the CLOSED position. See

Section 3. Calibration above.

CAUTION: Be careful not to move the ball stem

during this operation. Turning the ball valve 90°

in either direction will reverse the control action

of the valve and the compressor will experience

high oil temperature within minutes. Turning

the ball valve 180° has no detrimental effect.

9. Manual Override

The actuator has a handwheel that can be en-

gaged to override the electrically determined

position of the ball valve.

Push and rotate to engage.

Push a second time to de-clutch.

CONTROL SYSTEM

Equipped for automatic operation, the screw com-

pressor unit has safety controls to protect it from

irregular operating conditions, an automatic start-

ing and stopping sequence, capacity and volume

ratio control systems.

Check all pressure controls with a remote pres-

sure source, to assure that all safety and operating

control limits operate at the point indicated on the

microprocessor.

The unit is equipped with block and bleed valves

that are used to recalibrate the pressure transduc-

ers. To use the block and bleed valves to recalibrate

the pressure transducers, the block valve is shut

off at the unit and the pressure is allowed to bleed

off by opening the bleed valve near the pressure

transducer enclosure. The transducer can then be

calibrated at atmospheric pressure (0 psig), or an

external pressure source with an accurate gauge

may be attached at the bleed valve.

The discharge pressure transducer cannot be iso-

lated from its pressure source, so it is equipped with

only a valve to allow an accurate pressure gauge to

be attached and the pressure transducer calibrated

at unit pressure.

Recheck the transducers periodically for any drift

of calibration.

Operation

A. Screw Compressor Control And Operation

1. Starting, Stopping and Restarting the Com-

pressor.

Before the screw compressor unit is started,

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 accom-

plished a number of ways. Any of the safety

setpoints will stop the compressor unit if an

abnormal operating condition exists. The com-

pressor 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

de-energized 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 ap-

propriate 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 fail-

ure option is selected (see appropriate Micro-

processor 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.

FIGURE 4.

SLIDE VALVE MOTOR LOCATION

When viewing the compressor from the dis-

charge end (opposite the drive end), the upper

motor is for capacity control. The command

shaft turns (see Table 1) to decrease the capac-

ity to 10% and reverses to increase the capacity

to 100%. The lower motor is for volume ratio

control. The command shaft turns 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 mo-

tors 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 direc-

tion 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.

Operation

Note:

Optical Actuators CAN NOT

be manually rotated.

(The VSM 501-701 models

will have motor locations

oppositeofgure#6)

The Motor Amps Load Limit protects the com-

pressor from overloading by decreasing the

compressor capacity if the motor amperage is

at the Maximum Amps setpoint, or preventing

an increase in capacity if the motor amperage is

above the Full Load Amps setpoint. ( See manual

for the appropriate microprocessor.)

3. Oil Separator Heater

The oil separator heater keeps the oil in the

separator from becoming too viscous and helps

keep gas from condensing in the receiver section

of the separator.

The heater is turned on only when the compres-

sor is off. The separator heater is supplied with

an integral temperature control.

Operation

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

Low oil pressure differential stops the compressor

unit when there is an insufficient difference in pres-

sure between the oil manifold and suction.

2. Discharge Pressure

High discharge pressure cutout stops the compres-

sor unit, when the discharge pressure in the oil

separator exceeds the setpoint.

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

COMP. CAPACITY VOLUME CAPACITY VOLUME

MODEL INC DEC INC DEC TURNS/ANGLE/TRAVEL TURNS/ANGLE/TRAVEL

VSR 111 CCW CW CCW CW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045”

VSR 151 CCW CW CCW CW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045”

VSR 221 CCW CW CCW CW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045”

VSR 301 CCW CW CCW CW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045”

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

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

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

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

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

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

VSS 1501 CW CCW CC CCW 1.36 / 490 / 5.325” 0.82 / 295 / 3.200”

VSS 1801 CW CCW CW CCW 1.36 / 490 / 5.325” 0.82 / 295 / 3.200”

VSM 71 CCW CW CCW CW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”

VSM 91 CCW CW CCW CW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”

VSM 101 CCW CW CCW CW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”

VSM 151 CCW CW CCW CW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”

VSM 181 CCW CW CCW CW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”

VSM 201 CCW CW CCW CW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”

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

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

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

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

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

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

TABLE 1. VSS / VSR / VSM COMMAND SHAFT ROTATION AND TRAVEL

Operation

4. Manually open the oil isolating valve at the oil

separator outlet connection.

5. Open the isolating valve(s) before and after the

oil filter housings.

6. Manually open the stop valve on the oil bleed

return line from the element section and open

the expansion valve 1/2 of a turn.

FIGURE 5.

OIL SEPARATOR BLEED LINE

NOTE:

The purpose of the oil bleed return assembly is to

collect any oil that passes through the oil separat-

ing element and returns that oil to the compres-

sor. The hand expansion valve should be adjusted

to prevent an oil level from forming in the sight

glass when the compressor is at 100% capacity.

Generally 1/2 to 1 turn open is satisfactory.

7. Open 1/4” high pressure gas line

valve piped to oil injection line just

enough to quiet compressor at 100%

capacity.

E. Compressor Pre Start-Up Check List

Before proceeding with actual starting of the

compressor, the items listed on the “Pre Start-Up

Check List” must be verified. Time and money will

be saved before the Vilter start-up technician ar-

rives. (See next page.)

3. Suction Pressure

Low suction pressure cutout stops the compres-

sor unit when the suction pressure drops below

the setpoint.

4. Oil Filter Differential

High oil filter differential cutout stops the com-

pressor unit when the difference between the

outlet and inlet of the filter exceeds the setpoint.

5. Oil Temperature

The oil temperature cutout stops the compres-

sor unit when the oil temperature is too high

or too low.

6. Discharge Temperature

The high discharge temperature cutout stops

the compressor unit when the discharge tem-

perature exceeds the setpoint.

INITIAL START-UP

A. Setting of Controls

(Refer to the appropriate microprocessor manual

for a list of initial settings.)

B. Valve Settings

1. The suction line uses separate stop and check

valves. Ensure the suction stop valve is open

prior to starting.

2. The ¼” suction equalization valve should be

closed during operation. The valve enables the

unit to slowly equalize to low side pressure dur-

ing off periods. This valve must be adjusted to

minimize oil loss when compressor stops.

3. The discharge line uses separate stop and check

valves. Ensure the discharge valve is open prior

to starting.

Pre Start-Up Checklists

The following checklists are to help prepare the equipment before the Vilter Technician arrives at the

jobsite. Vilter recommends that a Trained Technician go through the following tasks. The operating

Manuals provided by Vilter, can be referenced for any type of questions or special instructions.

Every Refrigeration unit includes a Vilter Start-Up (Conrm on PO). The following tasks are not included

in the Vilter Start-up provided in your equipment purchase. Any tasks below that are done by the Vilter

Technician will take away from the pre-determined time that was provided with the equipment pur-

chase. Vilter suggests that the Vilter Technician’s time be used during the start-up of the System and

not for the below System Preparation.

Note: Each item below MUST be “Checked-Off”, Signed and Returned to the Vilter Service Department.

Failure to do so will “Null & Void” future Warranty considerations.

Field Piping and Mechanical Requirements

NOTE: If start-up service has been purchased, the following items should be completed before the start-

up technician arrives. This will help save time and money.

1. The unit should be leveled and secured to the mounting pad or floor.

2. The suction and Discharge line must be piped and properly supported, independent of the unit

3. The Discharge Stop/Check Valve is shipped loose and must be installed in a vertical up flow direction or

in a horizontal line with the valve stem pointing upward at a 45° angle. During off periods, refrigerant

can condense in the line downstream of the Discharge Stop/Check Valve. It is recommended the Stop/

Check Valve be located to minimize the quantity of liquid that can accumulate downstream of the valve.

4. A Dual Safety Relief Valve is shipped loose for field installation. A connection is provided on the oil sepa

rator for the relief valve. Refer to ASHRAE/ANSI Standard 15 (Safety Code for Refrigeration) for proper

sizing and installation of Relief Valves and Vent Lines.

5. Piping For Oil Cooling

a) Liquid Injection

An adequate, or dedicated, liquid line is required for the Liquid Injection System. A high pressure

liquid source must be piped to the stop valve at the inlet of the Thermostatic Expansion Valve. On

booster units, an additional 3/8” line must be piped to the regulator from high stage discharge gas flow

or the Thermostatic Expansion Valve.

b) V-PLUS

A high pressure liquid source must be run to the V-PLUS® inlet. Some subcooling is desirable. A

high pressure float must be installed at the inlet of the pump and a 3/8” vent line must be returned to

a suction trap. Refer to the V-PLUS manual for additional information.

c) External Oil Cooler

On thermosyphon oil coolers, the refrigerant lines must be connected to the front head of the oil

cooler. On water cooled oil coolers, the water lines must be connected to the front head of the oil

cooler. Installation of water regulating and solenoid valves are recommended.

6. The oil separator should be provided with oil until the oil level is between the (2) sight glasses. An oil

charging connection is provided on the bottom of the oil separator.

7. The center member of the compressor coupling is shipped loose to help facilitate final field alignment

and allow for motor rotation check. The motor alignment should be within 0.004” total indicator read

ing in all directions.

a) Both the compressor and motor hubs should be checked for concentricity and perpendicularity.

b) The motor should be checked and shimmed for soft foot prior to attempting final alignment.

c) The center section of the coupling should be left out to allow the start-up technician to verify the

final alignment and motor rotations.

8. The unit should be pressure tested, evacuated and a system load should be available at the

time of start-up.

Order #_______________________________Compressor Serial #________________________

Field Wiring Requirements

VRS SCREW COMPRESSOR, VSS/VSM SINGLE SCREW COMPRESSOR UNITS

PRESTART-UP CHECKLIST

FIELD WIRING REQUIREMENTS FOR UNITS WITH FACTORY WIRED VISSION® MICROPROCESSORS

NOTE: If startup service has been purchased, to save time and money, the following items should be completed

before the startup technician arrives.

The unit is pre-wired at the factory. The necessary field wiring connections are described below.

1. Control power of 115 VAC 50/60 HZ must be wired to the left side terminals of the digital I/O board inside

the ViSSion® cabinet. Line power (L1) is brought in to a 10-amp fuse via the terminal marked “L1” on the

appropriate connector. The neutral (L1A) is brought in and connected to any of the “N” terminals located

on left connectors. Two separate line power feeds for the oil heaters are brought to two additional 10

amp fuses via the terminals marked “L2” and “L3” on the same connector just below the “L1” terminal.

The neutrals for these circuits (L2A and L3A) are also connected to any of the “N” terminals. For units

with V-PLUS® oil cooling, L1 must also be brought to the fuse in the V-PLUS® panel, and L1A must also be

brought to the terminal #2B in the V-PLUS® panel.

2. An auxiliary contact from the compressor motor starter is required. This isolated contact is connected to

the K-1 input relay using any of the “L” terminals on the strip of connectors, and returned to the terminal

marked “Motor Starter Aux. Safety” at the very top connector.

3. A dry contact from control relay K-22 must be wired to the compressor motor starter coil. This dry contact

is wired to terminals marked “Compressor Start – N.O. #1A” and “Compressor Start – N.O. #1B”. Control

power for this coil should come from a source, which will be de-energized with the compressor disconnect.

4. A dry contact from control relay K-19 must be wired to the oil pump motor starter coil. This dry contact

is wired to the two terminals marked “Oil Pump Starter”. Control power for this coil should come from a

source, which will be de-energized with the compressor disconnect.

5. An auxiliary safety cutout is available to shut down the compressor package using the K-2 input relay. A

dry contact must be supplied and wired to one of the “L” terminals on any of the connectors, and returned

to the terminal marked “Auxiliary #1 Safety” at the top connector. The jumper to the “Auxiliary #1 Safety”

terminal must be removed to use this cutout. The contact, if closed, will allow the compressor to run. If

this contact opens at any time, the compressor will shut down.

6. Indication of the compressor alarm or shutdown status is also available via two control relays. Relay K-20

is provided for remote trip indication and relay K-21 is provided for remote alarm indication. Each relay

has three terminals available: a common input, a normally open contact, and a normally closed contact.

For both relays, the energized state represents a “trip” or “alarm” condition. Loss of voltage to the relay

coil and the resultant return to normal state indicates “safe” condition.

7. The current transformer supplied in the compressor motor conduit box should be checked to insure that

the motor leads of one leg are pulled through the transformer. Note that there is a dot on one side of the

current transformer. This dot must face away from the motor. Typically, a wye delta started motor should

have leads 1 and 6 pulled through this transformer for a 6 lead motor. However, this should always be

checked as different motors and starting methods will require different leads to be used.

Order #_______________________________Compressor Serial #________________________

Stop Check Valve Operation

AUTO

In the “Auto Position”, the stop valve is

operating as a check valve, allowing ow

in the directions of the arrows.

To set the valve to the automatic posi-

tion, fully close the valve, and turn the

stem out as indicated by the chart below.

CLOSED

In the manually “Closed Postion”, the

stop check is operating as a conventional

stop valve, not allowing ow in either

direction.

OPEN

In the manually ” Open Position”, with

the valve stem fully back seated, the

valve disc is lifted slightly, allowing ow

in either direction.

Valve Size 1.5” 2” 2.5” 3” 4” 5” 6” 8”

Number of Turns Open 2 2.25 2.75 3.25 4.5 3.75 5.75 7.75

(from closed position)

A) Disconnect the motor drive coupling from the

compressor input shaft.

B) Disconnect all gas and oil piping which is at-

tached to the compressor. When removing the

suction strainer on gas compression units, the

suction line should be supported to prevent it

from sagging.

C) Replace oil drain in compressor housing and dis-

charge manifold after oil has stopped draining.

D) Remove all electrical connections to the com-

pressor.

E) On compressors with mounting feet, loosen and

remove bolts holding the compressor to the

base.

Keep compressor alignment shims together and

mark the locations with a permanent marker.

F) On compressors with C-flange the motor/C-

ange/compressor assembly must be supported

with a chain fall or other lifting device before the

bolts holding the compressor to the C-ange

adapter can be removed.

G) Install appropriate lifting eye into the threaded

hole on the top of the compressor.

Verify unit is properly secured to avoid compressor

from falling. Re-verify all piping and electrical are

properly disconnected prior to lifting unit.

H) Lift compressor from the base, verify the amount

of room needed for clearance and weight of

the bare compressor when the compressor is

removed from the unit.

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 com-

pressor 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 discon-

nect 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 com-

pressor 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 con-

tainers.

REMOVAL OF COMPRESSOR FROM THE UNIT

After preparing the unit for service, the following steps

should be followed when removing the compressor

from the unit:

Service

INSTALLATION OF THE COMPRESSOR

A) After the work has been completed, reinstall

the compressor on the base or C-ange adapter

(dependent upon compressor model).

B) On the units, replace the shims under the com-

pressor feet. Check for a soft foot. This is ac-

complished by tightening down three of the hold

down bolts and checking the clearance under the

fourth compressor foot. If there is clearance, add

the appropriate amount of shims. Tighten down

the fourth bolt and loosen either adjacent bolt

and check again for clearance, adding shims ac-

cordingly. Align the compressor and motor.

On compressors the discharge elbow should

be tightened on the separator rst, before the

compressor manifold ange is tightened. This

should be done to prevent compressor to motor

misalignment.

Replace all electrical, gas and oil connections

removed when servicing the compressor.

LEAK CHECKING UNIT

Note: Unit can be leak checked before evacuation.

CAUTION

Slowly pressurize the unit from the discharge side of the

compressor. Pressurizing the compressor from the suc-

tion side may cause rotation of the compressor without

oil supply, which could lead to internal damage.

A) Use a vacuum pump to evacuate the unit.

B) Break the vacuum on the unit using dry nitrogen

and check for leaks. Concentrate on areas where

work was done.

C) If no leaks are found, the unit can be returned to

service.

Service

Top View

Direction of rotor movement.

Axial force at coupling

to be 250-300lbs.

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.

Rotor Being Pushed By

Use Of Lever

Direction of rotor movement.

Axial force at gate rotor to be

200 to 300 lbs.

Wooden block to prevent

damge to gate rotor blade.

Force to be determined

by length of level arm.

Use bolt for fulcrum.

Rigidly attach

dial indicator.

Side View

Showing gate rotor bearing float

being measured.

COMPRESSOR INSPECTION

The Vilter Single Screw Compressor is designed for

long periods of trouble free operation with a mini-

mum of maintenance. However, a yearly inspection

is recommended so any irregular wear is noted and

rectied. At this time, the bearing oat is measured

for the main rotor and gate rotors.

The following are the procedures used in measuring

the main rotor and gate rotor bearing oat.

BEARING CHECK

CAUTION

When taking the measurements, do not exceed 250

to 300 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 oat.

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 compres-

sor coupling half and push the coupling

towards the motor (note measurement).

TABLE.1 MAXIMUM BEARING FLOAT

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).

MAIN GATE

Bearing Float 0.003” 0.002”

Maximum Force 250 to 300 50 to 100

Lbs. Lbs.

Service

Direction of rotor movement.

Axial force at gate rotor to be

250 to 300 lbs.

Wooden block to prevent

damge to gate rotor blade.

Force to be determined

by length of level arm.

Use bolt for fulcrum.

Rigidly attach

dial indicator.

Side View

Showing gate rotor bearing float

being measured.

TABLE 2. GATE ROTOR FLOAT

E) Readings could be higher than 0.020. If readings

is greater than 0.030 over table tolerance contact

Vilter’s home ofce.

F) Inspect the main and gate rotors for signs of ab-

normal wear due to dirt or other contaminants.

G) After the inspection is complete, the covers,

coupling center member and guard can be rein-

stalled and the unit can then be evacuated and

leak checked before starting.

4) Add both readings, the total indicator move-

ment is the bearing oat and this should not

exceed 0.003”.

C) Gate rotor bearing oat.

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”.

D) Measure the gate rotor to blade float. Some

movement between blade and support is neces-

sary 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 sup-

port. The total movement of the damper pin

in the bushing is the gate rotor oat. Refer to

table 0.2 to nd the maximum blade to sup-

port oat (on new compressor parts only).

MODEL FLOAT

VSM 301 THRU 401 0.045”

VSM 501 THRU 701 0.045”

VSS 291 THRU VSS 601 0.045”

VSS 751 & VSS 901 0.055”

VSS 1051 & VSS 1201 0.060”

VSS 1551 & VSS 2101 0.060”

Service

Drive End

GATE ROTOR ASSEMBLY CAUTION

Gate rotor removal and assembly is divided into dis-

tinct instructions, instructions for all VSG and VSSG

models and different instructions for all VSM models.

Please follow the appropriate set of instructions.

REMOVAL

A) Prepare the compressor for servicing.

NOTE: All parts must be kept with their appro-

priate side and not mixed when the compres-

sor 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 VSS 451 thru 601. For the VSS

751 thru 901 and VSS 1051 thru 1201 compres-

sors, use the side rails and assemble to the gate

rotor stabilizer as stamped. For the VSS 1551

thru 3001, 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.

Service

901C

901B

901A

For VSM 451 thru 601

compressors, do not

use side rails.

For VSS 751/901 & VSS 1051/1201

compressors, use side rails and

assemble to gaterotor stabilizer

as stamped.

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 remov-

ing 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 ats provided near the roller bearing hous-

ing. 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 pro-

vided 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 VSM 301-701 MODELS)

The removal of the gate rotor assembly for the VSM

301-701 compressors is similar for the VSS 901-

3001 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 hous-

ing 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 be-

tween 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 suc-

tion 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 VSS 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 sup-

port.

Install gate rotor stabilizer. The gate rotor sta-

bilizer (901) will hold the gate rotor support

in place as the thrust bearing housing is being

installed. If the gate rotor support is not re-

stricted 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 t of the

bearings on the gate rotor shaft, the thrust bear-

ing removal and installation tool with the pusher

shoe must be used. Turn the jacking screw clock-

wise. 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 com-

pressor 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 O-

ring (143). Check the clearance between the

entire gate rotor blade and the shelf, rotate

the gate rotor to nd 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 fac-

tory: 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.

Service

GaterotorforC-angeModels

INSTALLATION (All VSM 301-701 Models)

A) Install the gate rotor support. Carefully tilt the

roller bearing end of the gate rotor support to-

wards 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 nd 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.

Service

GATE ROTOR BLADE REMOVAL

A) Remove the gate rotor assembly.

B) Remove the snap ring and washer from the gate

rotor assembly. Lift gate rotor blade assembly off

the gate rotor support.

C) Check damper pin and bushing for excessive wear.

Replace if necessary.

Service

Relief area faces TOP of assembly.

TOP of assembly

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 sup-

port. 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 VSS Models)

for removal of the gate rotor bearing housings

and gate rotor supports.

B) For removal of thrust bearings on VSM 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 VSS units:

1) Remove retaining ring from gate rotor sup-

port.

2) Remove bearings from support.

3) Remove bearing retainer from inner race.

Service

(with Relief)

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 hous-

ing, use Loctite® 242-thread locker and

evenly tighten the bolts to the recom-

mended torque value.

3) For installation of the bearing housing and

the setting of the gate rotor blade clear-

ance, refer to section INSTALLATION (All

VSG Models).

B) For installation of thrust bearings on VSM 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 posi-

tioned face to face. This means that the

larger sides of the inner races are placed

together. A light application of clean com-

pressor lubricating oil should be used to

ease the installation of the bearings into

the gate rotor support.

3) Install the bearing retaining snap ring.

4) For installation of the bearing housing and

the setting of the gate rotor blade clear-

ance, refer to section INSTALLATION (All

VSG Models).

Inner Retainer

Ball Bearings

Retaining Ring

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 sup-

port.

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).

Service

COMPRESSOR SHAFT SEAL REPLACEMENT

COMPRESSOR SHAFT SEAL REMOVAL

A) Prepare the compressor for servicing as outlined

in section REMOVAL.

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 mirror face (219B) and

rotating carbon face (219C).

Seal with stationary carbon face (219B)

and rotating mirror face (219C).

Current Shaft Seal and for all Replace-

ment.

Service

COMPRESSOR SEAL INSTALLATION

NOTE:

When replacing the stationary members of the seal

on the VSS 451 thru VSS 601 the roll pin in the cover

is used only with the seal assembly having a station-

ary 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. Ap-

ply 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. Care-

fully push the seal on, holding onto the outside

area of the seal until the seal seats against the

Service

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 lled with clean compressor oil

may be used to lubricate the faces of the seals

without touching the seal.

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 recom-

mended torque values.

G) Install the coupling and coupling guard. The unit

can then be evacuated and leak checked.

Service

MAIN ROTOR ASSEMBLY

Due to the procedures and tools

involved in the disassembly and

reassembly, the main rotor assembly

must be performed by qualified

individuals. Please consult the factory

if maintenance is required.

INSPECTION OF SLIDE VALVE ASSEMBLIES IN

THE COMPRESSOR

Prepare the compressor for servicing.

A) Remove the gate rotor access covers. Using a

mirror and ashlight, visually inspect the slide

valve carriage through the gas bypass opening.

Look for any signicant 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 be-

tween 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 toler-

ances, 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.

Service

D) Locate and remove the socket head plugs above

the slide valve carriage attachment bolts. Re-

move 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 car-

riage. 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 as-

semblies.

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.

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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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 as-

sembly out of the housing.

4 5 7 4 7 7 415

C) The command shaft bearing (435) is a press

t on the command shaft (413). Remove the

command shaft bearing with a suitable press.

D) Remove the O-ring seal (445) from the com-

mand shaft housing. The command shaft bush-

ing (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.

Reference “Parts

Section” for current

Housing

436

445

Ve n t h o le .

Service

DISCHARGE MANIFOLD REMOVAL

A) Remove both control actuators and command

shaft assemblies.

B) On VSS 451-3001 compressors, remove the dis-

charge 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 VSM 301-701 compressors unbolt the dis-

charge ange 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.

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 recom-

mended torque value.

B) On VSS 451-3001 compressors install the dis-

charge 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

ange bolts. Install the drain plug in the bottom

of the discharge manifold.

C) On VSM 301-701 compressors install the bolts

in the discharge ange. Install the drain plug in

the bottom of the discharge manifold.

D) Install both command shaft assemblies and

control actuators.

SLIDE VALVE GEAR AND RACK INSPECTION

A) Remove the discharge manifold.

B) Check rack to rack clamp and rack clamp spacer

clearance on all four slide valves.

TABLE 4.1

RACK CLEARANCE VALUES

C) Check torque of socket heat cap screws.

D) Check for excessive movement between the

slide valve rack shafts and the rack. The jam nuts

on the end of the slide valve rack shaft should be

tight.

E) Check for loose or broken roll pins in gears.

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F) Look for any excessive wear on all moving parts

and replace the worn parts.

G) Reassemble the manifold and discharge elbow.

REMOVAL OF CAPACITY OR VOLUME CROSS

SHAFTS

A) Remove the discharge manifold.

B) To remove the capacity or volume ratio slide

valve racks, remove the two jam nuts and lock

washers (361) securing the rack (316) to the slide

valve shafts. The racks can now be pulled off the

slide valve shafts. Repeat the procedure for the

remaining pair of slide valve racks.

MEASUREMENT CLEARANCE

Rack to clamp. 0.005 to 0.010”

Rack to clamp spacer. 0.003 to 0.005”

C) To remove the cross shafts, remove socket head

bolts, clamp and spacers from both sides.

VSS 751-2101 compressors cross shafts.

VSM 301-701 & VSS 2601-3001 compressors

cross shafts

Volume control cross shaft.

Capacity control cross shaft.

D) Drive the roll pins from pinion gear from one

side. Remove pinion gear. Slide the cross shaft

with the remaining pinion gear or spacers out of

the opposite side. Repeat the procedure for the

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remaining 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 recom-

mended torque values.

B) The slide valve sets must be synchronized on VSS

451-3001 and dual gate VSM 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.

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 recom-

mended torque value.

Service

HEAD OUTSIDE DIAMETER OF BOLT SHANK

TYPE BOLT MARKINGS 1/4” 5/16” 3/8” 7/16” 1/2” 9/16” 5/8” 3/4” 7/8”

SAE GRADE 2 6 12 20 32 47 69 96 155

SAE GRADE 5 10 19 33 54 78 114 154 257

SAE GRADE 8 14 29 47 78 119 169 230 380

SOCKET HEAD 16 33 54 84 125 180 250 400

CAP SCREW

TORQUE SPECIFICATIONS (ALL UNITS IN FT.-LBS)

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 8 14 25 40 60 101 137 245

SCREW

NUT 8

NOTE: CONTINUE USE OF RED LOCTITE ON CURRENTLY APPLIED LOCATIONS. USE BLUE

LOCTITE ON ALL REMAINING LOCATIONS.

Service

USING A TORQUE WRENCH CORRECTLY

TORQUE WRENCHES

USING A TORQUE WRENCH CORRECTLY INVOLVES FOUR PRIMARY CONCERNS:

A. A smooth even pull to the break point is required. Jerking the wrench can cause the pivot point

to break early leaving the bolt at a torque value lower then required. Not stopping when the

break point is reached results in an over torque condition.

B. When more than one bolt holds two surfaces together there is normally a sequence that

should be used to bring the surfaces together in an even manner. Generally bolting is tight-

ened 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specied.

D. Unlike a ratchet wrench a torque wrench is a calibrated instrument that requires care. Recali-

bration 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.

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.

Service

6.00 OIL FILTER ELEMENTS

The following is a description of the oil filter elements

supplied on standard VSS, VSR and VSM single screw

compressor units

6.01 1833C FILTER ELEMENTS

Vilter Part Number 1833C

Usage VSS 451 to VSS 1801

Dates All units prior to

3-1-00

Length 18”

Diameter 6-1/8”

A) Characteristics;

1) The outside of the filter element is covered

with a perforated metal surface.

2) At each end of the filter, there is a large thick

elastomeric seal.

3) The housing is a fabricated steel housing

with bolted end cover. The housing can

contain one or two elements.

4) Simplex filter housing is standard with

duplex filter housings with a bypass valve

arrangement is optional, so that the filter

can be changed while unit is in operation.

6.02 KT 721 FILTER ELEMENTS

Vilter Part Number KT 721

Tank O-Ring 2176BU

Usage VSR Compressors

Dates 1992 to 8-1-96

Length 8”

A) Characteristics;

1) Pleated type element with a screen covering

the surface of the element.

2) One end of the element is solid while the

other has a pilot hole with a captive “o”-ring.

6.03 KT 722 FILTER ELEMENTS

Vilter Part Number KT 722

Tank O-Ring 2176AJ

Usage VSR Compressors

Dates 1996 to 2002

Length 16.8”

A) Characteristics;

1) Pleated type element with a screen covering

the surface of the element.

2) One end of the element is solid while the

other has a pilot hole with a captive “o”-ring.

Service

Simplex filter housing. Duplex filter housing.

6.04 KT 773A & B FILTER ELEMENTS

Vilter Part KT 773A KT 773B

Number

Tank O-Ring 2176BY 2176BZ

Usage 3109A 3111A

Duplex Simplex

Housing Housing

Usage 1. VSM all models 4/1/00 to

present.

2. VSS 451 to 1201 models with 30”

and smaller oil separators 3/1/00

to present.

Length 16”

A) Characteristics;

1) Pleated type element with a screen cover-

ing the surface of the element.

2) One end of the element is solid while the

other has a pilot hole with a captive “o”-

ring.

3) On duplex models only the end cap is

removed from the filter bowl

B) Usage;

1) Used in simplex and duplex applications.

2) The O-rings for the simplex and duplex

housings are not interchangeable.

Service

6.05 KT 774 FILTER ELEMENTS

Vilter Part KT 774

Number

Tank O-Ring 2176BY

Usage 3112A 3110A

Simplex Duplex

Housings Housings

1. VSS 1501 & 1801 3-1-00 to

present.

2. All other VSS models with

30” and larger oil separators

3/1/00 to present.

Length 39”

C) Characteristics;

1) Pleated type element with a screen

covering the surface of the element.

2) One end of the element is solid while

the other has a pilot hole with a captive

“o”-ring.

3) Only end cap is removed from the filter

bowl.

D) Usage;

1) Used in simplex and duplex applica-

tions.

Service

Simplex filter housing.

Maintenance

NOTE: See Motor Manual for proper lubrication procedures and service intervals.

Refrigeration Maintenance and Inspection Schedule

The following service intervals are based on the usage of Vilter Manufacturing Corporation Premium Grade refrig-

eration oil in VSS, VSM and VSR Single Screw Compressor units.

SERVICE INTERVAL (HOURS)

OIL CIRCUIT

Oil Change (1) R R R R R R R

Oil Analysis (2) S S S S S S S S S S S S S

Oil Filters (3) R R R R R R R R R R R R R R

Oil Strainer I I I I I I I I I I I I I I

PACKAGE

Coalescing Elements R R R R

Suction Screen I I I I I I I I I I I I I I

Liquid Line Strainers I I I I I I I I I I I I I I

Coupling Alignment

and Integrity I I I I I I I I I I I I I I

CONTROL

CALIBRATION Transducers I I I I I I I I I I I I I I

RTD’s I I I I I I I I I I I I I I

COMPRESSOR

Inspect Compressor I I I I I I I

Bearings I

Key I Inspect.

R Replace.

S Sample.

Notes: (1) The oil should be changed at these intervals, unless oil analysis results exceed the allowable limits.

The frequency of changes will depend on the system cleanliness.

(2) Oil analysis should be done at these intervals as a minimum; the frequency of analysis will depend on

system cleanliness.

(3) The oil filter(s) on a minimum must be changed at these intervals or annually if not run continuously.

However, the oil filter(s) must be changed if the oil filter differential exceeds 12 psi or oil analysis

requires it.

200

5,000

10,000

20,000

30,000

40,000

50,000

60,000

70,000

80,000

90,000

100,000

110,000

120,000

Inspection

Group Maintenance

Item

Recommended

Spare Parts List

Refer to the Custom Manual

SparePartsSectionforSpecicApplications

PleasehaveyourModel#andSalesOrder#availablewhenordering.

These are found on the compressor’s Name Plate.

Parts Section

Gate Rotor

MODEL NUMBER

ITEM DESCRIPTION VSS 451 VSS 601

QTY VPN QTY VPN

GATE ROTOR BLADE AND BEARING

REPLACEMENT KIT, 111, 118, 120A,

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

130, 131, 141, 142 & 143. 2 KT712A 2 KT712B

GATE ROTOR BLADE REPLACE

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

123, 124, 130, 141, 142 & 143. 2 KT713A 2 KT713B

102 GATE ROTOR SUPPORT ASSEMBLY

100, 111, 120B, 119 & 130. 2 A25161BB 2 A25161BA

105 GATE ROTOR GASKET SET 118, 141,

142 & 143. 2 A25164B 2 A25164B

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

(1) 123, (1) 124. 2 A25165B 2 A25165B

110 SUPPORT. 2 25606A 2 25520A

111 GATE ROTOR. 2 25557A 2 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.

NOTE: ar = As Required

2 25518A

2 25517A

2 25008A

2 25009A

2 25258A

2 25519A

2 25259A

2 25007A

2 25006A

2 25760A

ar 25010AA

ar 25010AB

ar 25010AC

ar 25010AD

2 2864B

4 2865B

2 2866A

2 2867A

2 2868B

2 25910A

2 2176M

2 2176R

2 2176N

12 2796AJ

6 2796B

40 2796CJ

32 2796E

12 2795E

Gate Rotor

2 25518A

2 25517A

2 25008A

2 25009A

2 25258A

2 25519A

2 25259A

2 25007A

2 25006A

2 25760A

ar 25010AA

ar 25010AB

ar 25010AC

ar 25010AD

2 2864B

4 2865B

2 2866A

2 2867A

2 2868B

2 25910A

2 2176M

2 2176R

2 2176N

12 2796AJ

6 2796B

40 2796CJ

32 2796E

12 2795E

Gate Rotor

ITEM DESCRIPTION VSS 751 VSS 901 VSS 1051 VSS 1201

QTY VPN QTY VPN QTY VPN QTY VPN

GATE ROTOR BLADE AND BEARING

REPLACEMENT KIT, 111, 118, 120A,

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

130,131, 141, 142 & 143. 2 KT712C 2 KT712D 2 KT712E 2 KT712F

GATE ROTOR BLADE REPLACE

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

123, 124, 130, 141, 142 & 143. 2 KT713C 2 KT713D 2 KT713E 2 KT713F

102 GATE ROTOR SUPPORT ASSEMBLY

100, 111, 120B, 119 &130 2 A25161CB 2 A25161CA 2 A25161DB 2 A25161DA

105 GATE ROTOR GASKET SET 118, 141,

142 & 143. 2 A25164C 2 A25164C 2 A25164D 2 A25164D

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

(1) 123, (1) 124. 2 A25165C 2 A25165C 2 A25165C 2 A25165C

110 SUPPORT. 2 25612A 2 25553A 2 25614A 2 25587A

111 GATE ROTOR. 2 25608A 2 25554A 2 25610A 2 25588A

118 GATE ROTOR COVER GASKET. 2 25088A 2 25088A 2 25132A 2 25132A

119 WASHER. 2 25086A 2 25086A 2 25086A 2 25086A

120A BUSHING, SMALL DOWEL PIN. 2 25087A 2 25087A 2 25104A 2 25104A

120B BUSHING, LARGE DOWEL PIN. 2 25760B 2 25760B 2 25760B 2 25760B

121* SHIM 0.002”. ar 25089AA ar 25089AA ar 25089AA ar 25089AA

122* SHIM 0.003”. ar 25089AB ar 25089AB ar 25089AB ar 25089AB

123* SHIM 0.005”. ar 25089AC ar 25089AC ar 25089AC ar 25089AC

124* SHIM 0.010”. ar 25089AD ar 25089AD ar 25089AD ar 25089AD

125 ROLLER BEARING. 2 2864C 2 2864C 2 2864G 2 2864G

126 BALL BEARING. 4 2865A 4 2865A 4 2865A 4 2865A

130 RETAINING RING. 2 2866B 2 2866B 2 2866B 2 2866B

131 RETAINING RING. 2 2867E 2 2867E 2 2867L 2 2867L

135A DOWEL PIN, SMALL, 0.3125” O.D.. 2 2868F 2 2868F 2 2868H 2 2868H

135B DOWEL PIN, LARGE, 0.4375” O.D.. 2 25910B 2 25910B 2 25910B 2 25910B

141 O-RING ROLLER BRG HSG. 2 2176N 2 2176N 2 2176AJ 2 2176AJ

142 O-RING BALL BRG HSG. 2 2176V 2 2176V 2 2176AM 2 2176AM

143 O-RING BRG HSG COVER. 2 2176U 2 2176U 2 2176U 2 2176U

ar = As Required

ITEM DESCRIPTION VSS 1551 VSS1851 VSS 2101

QTY VPN QTY VPN QTY VPN

GATE ROTOR BLADE AND BEARING

REPLACEMENT KIT, 111, 118, 120A,

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

131, 141, 142 & 143. 2 KT712M 2 KT712L 2 KT712K

GATE ROTOR BLADE REPLACEMENT

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

124, 130, 141, 142 & 143. 2 KT713N 2 KT713M 2 KT713L

101 GATE ROTOR ASSEMBLY 111 & 120. 2 A25160EB 2 A25160EA 2 A25160EA

102 GATE ROTOR SUPPORT ASSEMBLY

100, 111, 120B, 119 &130. 2 A25161EB 2 A25161EA 2 A25161EL

105 GATE ROTOR GASKET SET 118, 141,

142 & 143. 2 A25164E 2 A25164E 2 A25164E

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

(1) 123, (1) 124. 2 A25165E 2 A25165E 2 A25165E

110 SUPPORT. 2 25687A 2 25665A 2 25495D

111 GATE ROTOR. 2 25647A 2 25645A 2 25744D

112 SMALL BEARING HOUSING. 2 25667A 2 25667A 2 25667A

113 LARGE BEARING HOUSING. 2 25669A 2 25669A 2 25669A

114 RETAINER. 2 25141A 2 25141A 2 25141A

115 RETAINER. 2 25789A 2 25789A 2 25789A

116 BALL BEARING COVER . 2 25351A 2 25351A 2 25351A

117 GATE ROTOR COVER. 2 25354A 2 25354A 2 25354A

118 GATE ROTOR COVER GASKET. 2 26590A 2 26590A 2 26590A

119 WASHER. 2 25788A 2 25788A 2 25788A

120A BUSHING, SMALL DOWEL PIN. 2 25104A 2 25104A 2 25104A

120B BUSHING, LARGE DOWEL PIN. 2 25760C 2 25760C 2 25760C

121* SHIM 0.002”. ar 25791AA ar 25791AA ar 25791AA

122* SHIM 0.003”. ar 25791AB ar 25791AB ar 25791AB

123* SHIM 0.005”. ar 25791AC ar 25791AC ar 25791AC

124* SHIM 0.010”. ar 25791AD ar 25791AD ar 25791AD

125 ROLLER BEARING. 2 2864K 2 2864K 2 2864K

126 BALL BEARING. 4 2865K 4 2865K 4 2865K

130 RETAINING RING. 2 2866G 2 2866G 2 2866G

131 RETAINING RING. 2 2867R 2 2867R 2 2867R

135A DOWEL PIN, SMALL, 0.375” O.D.. 2 2868H 2 2868H 2 2868H

135B DOWEL PIN, LARGE, 0.500” O.D.. 2 25910C 2 25910C 2 25910C

141 O-RING ROLLER BRG HSG. 2 2176U 2 2176U 2 2176U

142 O-RING BALL BRG HSG. 2 2176BD 2 2176BD 2 2176BD

143 O-RING BRG HSG COVER. 2 2176P 2 2176P 2 2176P

150 HEX HEAD CAP SCREW. 12 2796CJ 12 2796CJ 12 2796CJ

151 HEX HEAD CAP SCREW. 8 2796N 8 2796N 8 2796N

152 HEX HEAD CAP SCREW. 32 2796CJ 32 2796CJ 32 2796CJ

153 HEX HEAD CAP SCREW. 44 2796R 44 2796R 44 2796R

160 SOCKET HEAD CAP SCREW. 16 2795G 16 2795G 16 2795G

ar = As required

Gate Rotor

Shaft Seal

MODEL NUMBER

ITEM DESCRIPTION VSS 291-601 VSS 751-1201 VSS 1551 thru 2101

QTY VPN QTY VPN QTY VPN

SHAFT SEAL VITON KIT, 219, 260, 230 1 KT709AG 1 KT709BG 1 KT709CG

230 OIL SEAL. 1 25040A 1 25064A 1 2930B

260 O-RING. 1 2176F 1 2176AC 1 2176BH

Shaft Seal With Stationary Carbon Face

Main Rotor

MODEL NUMBER

ITEM DESCRIPTION VSS 451 VSS 601 VSS 751 VSS 901 VSS 1051 VSS 1201 VSS 1551 VSS 1851 VSS 2101

QTY PART# QTY PART# QTY PART# QTY PART# QTY PART# QTY PART# QTY PART# QTY PART# QTY PART#

201 ROTOR ASSY 1 A25168BB 1 A25168BA 1 A25168CB 1 A25168CA 1 A25168DB 1 A25168DA 1 A25168EB 1 A25168AE 1 A25225EE

(DOES NOT INCLUDE

SHIM PACK #207)

207 SHIM PACK 1 A25177B 1 A25177B 1 A25177C 1 A25177C 1 A25177D 1 A25177D 1 A25177E 1 A25177E 1 A25177E

Slide Valve Cross Shafts and End Plate

MODEL NUMBER

VSS 291-601

ITEM DESCRIPTION QTY VPN

221 SHAFT. 2 25843A

222 GEAR. 4 25027A

226 RACK CLAMP. 2 25913A

227 RACK CLAMP. 2 25913B

228 SPACER. 2 25847A

268 EXPANSION PIN. 4 1193D

269 EXPANSION PIN. 4 2981AA

286 SOCKET HEAD CAP SCREW. 8 2795F

297 SET SCREW 2 2060J

298 SET SCREW 2 2060H

Slide Valve Cross Shafts and End Plate

MODEL NUMBER

ITEM DESCRIPTION VSS 751 & VSS 901 VSS 1051 & VSS 1201

QTY VPN QTY VPN

220 END PLATE 1 25543A 1 25593A

221 SHAFT. 2 25844A 2 25845A

222 GEAR. 4 25027A 4 25027A

226 RACK CLAMP. 4 25913C 4 25913C

228 SPACER. 4 25033C 4 25033C

267 DOWEL PIN. 2 2868B 2 2868B

268 EXPANSION PIN. 4 1193D 4 1193D

269 EXPANSION PIN. 4 2981AA 4 2981AA

270 PIPE PLUG. 2 2606E 2 2606E

286 SOCKET HEAD CAP SCREW. 8 2795F 8 2795F

297 SET SCREW 2 2060J 2 2060J

298 SET SCREW 2 2060H 2 2060H

MODEL NUMBER

ITEM DESCRIPTION VSS 1551Thru VSS 2101

QTY VPN

220 END PLATE 1 25661A

221 SHAFT. 2 25793A

222 GEAR. 4 25027A

226 RACK CLAMP. 4 25913C

228 SPACER. 4 25033C

267 DOWEL PIN. 2 2868B

268 EXPANSION PIN. 4 1193D

269 EXPANSION PIN. 4 2981AA

270 PIPE PLUG. 2 2606A

286 SOCKET HEAD CAP SCREW. 8 2795F

297 SET SCREW 2 2060J

298 SET SCREW 2 2060H

Capacity Slide

Volume Slide

Carriage Assembly

Slide Valve Carriage Assembly

MODEL NUMBER-

ITEM DESCRIPTION VSS 291 Thru VSS 601

QTY VPN

300 CARRIAGE ASSEMBLY. 2 A25179B

304 CAPACITY PISTON 340, 341, 350 & 355 2 A25183B

305 VOLUME PISTON 340, 342, 350 & 355 2 A25184B

307 GASKET SET 345B. 2 A25200B

316 RACK. 2 25024A

323 RACK. 2 25023A

343A COVER, SEPARATE VOL. & CAP. 4 25022A

343B COVER, ONE PIECE CAST. 2 25399A

345A GASKET, SEPARATE VOL. & n/a

CAP COVERS. 4 25021A

345B GASKET, ONE PIECE CAST COVER. 2 25900A

350 PISTON RING SET. 4 2953AA

355 EXPANSION PIN. 4 1193PP

359 PIPE PLUG. 6 2606D

360 LOCK WASHER (PAIR). 4 3004C

361 WASHER. 4 13265B

363 NUT. 8 2797A

366A HEX HEAD CAP SCREW, SEPARATE

VOL. & CAP COVERS. 24 2796N

366B HEX HEAD CAP SCREW, ONE PIECE

CAST COVER. 24 2796B

Slide Valve Carriage Assembly

MODEL NUMBER

ITEM DESCRIPTION VSS 751 VSS 901 VSS 1051 VSS 1201

QTY VPN QTY VPN QTY VPN QTY VPN

300 CARRIAGE ASSEMBLY. 2 A25179C 2 A25179C 2 A25179D 2 A25179D

304 CAPACITY PISTON 340, 341, 350 & 355. 2 A25183C 2 A25183C 2 A25183D 2 A25183D

305 VOLUME PISTON 340, 342, 350 & 355. 2 A25184C 2 A25184C 2 A25184D 2 A25184D

307 GASKET SET 345B & 378**. 2 A25200C 2 A25200C 2 A25200D 2 A25200D

316 RACK. 2 25080A 2 25080A 2 25080C 2 25080C

323 RACK. 2 25080B 2 25080B 2 25080D 2 25080D

340 PISTON. 4 25076A 4 25076A 4 25138A 4 25138A

341 CAPACITY PISTON SHAFT. 2 25078A 2 25078A 2 25078E 2 25078E

342 VOLUME PISTON SHAFT. 2 25078B 2 25078B 2 25078F 2 25078F

343A COVER, SEPARATE VOL. & CAP. 2 25123B 2 25123B 4 25123C 4 25123C

343B COVER, ONE PIECE CAST. 2 25279A 2 25279A 2 25401A 2 25401A

344 COVER, SEPARATE VOL. & CAP. 2 25123A 2 25123A n/a n/a n/a n/a

345A GASKET, SEPARATE VOL. &

CAP COVERS. 2 25124B 2 25124B 4 25124C 4 25124C

345B GASKET ONE PIECE CAST COVER. 2 25902A 2 25902A 2 25901A 2 25901A

346 GASKET, SEPARATE VOL. & CAP

COVERS. 2 25124A 2 25124A n/a n/a n/a n/a

347 PISTON SLEEVE. 2 25079A 2 25079A n/a n/a n/a n/a

350 PISTON RING SET. 4 2953AB 4 2953AB 4 2953AC 4 2953AC

355 EXPANSION PIN. 4 1193PP 4 1193PP 4 1193PP 4 1193PP

359 PIPE PLUG. 6 2606D 6 2606D 6 2606E 6 2606E

360 LOCK WASHER (PAIR). 4 3004C 4 3004C 4 3004C 4 3004C

361 WASHER. 4 13265B 4 13265B 4 13265B 4 13265B

363 NUT. 8 2797A 8 2797A 8 2797A 8 2797A

366A HEX HEAD CAP SCREW. 12 2796B 12 2796B 24 2796B 24 2796B

366B HEX HEAD CAP SCREW. 12 2796P 12 2796P 24 2796P 24 2796P

367 HEX HEAD CAP SCREW. 12 2796BN 12 2796BN n/a n/a n/a n/a

373 SOCKET HEAD CAP SCREW. 6 2795N 6 2795N 6 2795P 6 2795P

374 LOCK WASHER (PAIR). 6 3004C 6 3004C 6 3004D 6 3004D

378 0-RING. 2 2176Y 2 2176Y n/a n/a n/a n/a

380 RETAINER RING. 2 2866C 2 2866C n/a n/a n/a n/a

Slide Valve Carriage Assembly

MODEL NUMBER

ITEM DESCRIPTION VSS 1551 to 2101

QTY VPN

300 CARRIAGE ASSEMBLY. 2 A25179E

304 CAPACITY PISTON 340, 341, 350 & 355 2 A25183E

305 VOLUME PISTON 340, 342, 350 & 355 2 A25184E

307 GASKET SET 345 & 378. 2 A25200E

316 RACK. 2 25779A

323 RACK. 2 25780A

325 SHAFT. 2 25778A

340 PISTON. 4 25782A

341 CAPACITY PISTON SHAFT. 2 25784A

342 VOLUME PISTON SHAFT. 2 25783A

343B COVER. 2 25690A

345B GASKET. 2 25384A

347 PISTON SLEEVE. 4 25786A

350 PISTON RING SET. 4 2953AD

355 EXPANSION PIN. 4 1193PP

359 PIPE PLUG. 6 2606E

360 LOCK WASHER (PAIR). 4 3004C

361 WASHER. 4 13265B

363 NUT. 8 2797A

366B HEX HEAD CAP SCREW. 28 2796BL

373 SOCKET HEAD CAP SCREW. 6 2795AG

374 LOCK WASHER (PAIR). 6 3004D

378 0-RING. 4 2176AG

380 RETAINER RING. 4 2755AG

Actuator & Command Shaft

MODEL NUMBER

VSS 291 thru VSS 751 thru VSS 1051 thru VSS 1551 thru

ITEM DESCRIPTION VSS 601 VSS 901 VSS 1201 VSS 2101

QTY VPN VPN VPN VPN

400 COMMAND SHAFT ASSEMBLY 2 A25994B A25994C A25994D A25994E

401 SLIDEVALVE ACUATOR 2 25972D 25972D 25972D 25972D

446 O-RING 2 2176X 2176X 2176X 2176X

Actuator & Command Shaft

VSS Screw Compressor

Miscellaneous Frame Components

MODEL NUMBER

ITEM DESCRIPTION VSS 291 thru

VSS 601

QTY VPN

GASKET AND O-RING KIT; 1 KT710A1

504 FLANGE SET 513, 514 & 547A. 1 A25190A

506 ECON-O-MIZER PORT. 2 A25190B

512 MANIFOLD GASKET. 1 25503A

513 FLANGE OIL. 1 25058A

513 AFLANGE ECON-O-MIZER. 2 25058A

514 FLANGE GASKET OIL. 1 11323D

514A FLANGE GASKET ECON-O-MIZER. 2 11323D

518 SUCTION FLANGE GASKET. 1 25199C

519 DISCHARGE FLANGE GASKET. 1 25199B

524 COVER. n/a n/a

525 GASKET. n/a n/a

527 INLET SCREEN. n/a n/a

528 ECON-O-MIZER PLUG. n/a n/a

530 O-RING 2 2176AB

532 O-RING n/a n/a

535 PIPE PLUG 1/4” MPT. n/a n/a

539 PIPE PLUG. n/a n/an/an/a

540 DOWEL PIN. 2 2868B

545 HEX HEAD CAP SCREW FOR OIL n/a n/a

SUPPLY FLANGE. 2 2796C

545 HEX HEAD CAP SCREW FOR n/a n/a

ECON-O-MIZER FLANGE. 4 2796C

547 HEX HEAD CAP SCREW. 8 2796C

552 HEX HEAD CAP SCREW. n/a n/a

553 HEX HEAD CAP SCREW. n/a n/a

650 O-RING. n/a n/a

651 O-RING. n/a n/a

Miscellaneous Frame Components

MODEL NUMBER

ITEM DESCRIPTION VSS 751 VSS 901 VSS 1051 VSS 1201

QTY VPN QTY VPN QTY VPN QTY VPN

GASKET AND O-RING KIT; 1 KT710B 1 KT710B 1 KT710C 1 KT710C

504 FLANGE SET 513, 514 & 547. 1 A25190A 1 A25190A 1 A25190B 1 A25190B

512 MANIFOLD GASKET. 1 25541A 1 25541A 1 25324A 1 25324A

513 FLANGE OIL. 1 25058A 1 25058A 1 25058B 1 25058B

514 FLANGE GASKET OIL. 1 11323D 1 11323D 1 11323E 1 11323E

518 SUCTION FLANGE GASKET. 1 25199C 1 25199C 1 25199D 1 25199D

519 DISCHARGE FLANGE GASKET. 1 25199B 1 25199B 1 25199C 1 25199C

526 ORIFICE PLATE. 1 25223CB 1 25223CA 1 25223DB 1 25223DB

529 WAVE SPRING. 1 2912E 1 2912E 1 2912E 1 2912E

530 O-RING 2 2176J 2 2176J 2 2176J 2 2176J

538 PIPE PLUG 3/4” MPT. 6 2606A 6 2606A

540 DOWEL PIN. 2 2868B 2 2868B 2 2868B 2 2868B

547 HEX HEAD CAP SCREW. 21 2796GP 21 2796GP 24 2796GP 24 2796GP

554 HEX HEAD CAP SCREW. 1 2796U 1 2796U 1 2796U 1 2796U

100

MODEL NUMBER

ITEM DESCRIPTION VSS 1551 THRU

VSS 2101

QTY VPN

GASKET AND O-RING KIT; 1 KT710D

504 FLANGE SET 513, 514 & 547. 1 A25190C

504 FLANGE SET 513A, 514A & 547

ECON-O-MIZER PORT. 2 A25190D

512 MANIFOLD GASKET. 1 25676A

513 FLANGE OIL. 1 12477C

513A FLANGE ECON-O-MIZER.

514 FLANGE GASKET OIL. 1 11323F

514A FLANGE GASKET ECON-O-MIZER.

518 SUCTION FLANGE GASKET. 1 25199D

519 DISCHARGE FLANGE GASKET. 1 25199C

530 O-RING 2 2176J

538 PIPE PLUG 3/4” MPT. 3 2606A

540 DOWEL PIN. 2 2868K

542 PIPE PLUG 3/4” MPT. 1 13163F

545 HEX HEAD CAP SCREW FOR

OIL SUPPLY FLANGE. 4 11397E

NOTE: *Not pictured

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

Miscellaneous Frame Components

101

Replacement Tools

291

1551

102

MODEL NUMBER

ITEM DESCRIPTION VSS 291 thru

VSS 601

QTY VPN

900 GATEROTOR TOOLS (901, 910, 911,

912, 913, 914, 915, 916 & 917). 1 A25205B

901 GATEROTOR STABILIZER SET

(901A, 901B & 901C). 1 A25698A

MODEL NUMBER

ITEM DESCRIPTION VSS 751 VSS 901 VSS 1051 VSS 1201

QTY VPN QTY VPN QTY VPN QTY VPN

900 GATEROTOR TOOLS (901, 910, 911,

912, 913, 914, 915, 916 & 917). 1 A25205C 1 A25205C 1 A25205C 1 A25205C

901 GATEROTOR STABILIZER SET

(901A, 901B & 901C). 1 A25698A 1 A25698A 1 A25698A 1 A25698A

Replacement Tools

103

MODEL NUMBER

ITEM DESCRIPTION VSS 1551 thru

VSS 2101

QTY VPN

900 GATEROTOR TOOLS (901, 910, 911,

912, 913, 914, 915, 916 & 917). 1 A25205E

901 GATEROTOR STABILIZER SET

(901A, 901B, 901C & 901D). 1 A25699A

Replacement Tools

104

VSM 301-701 Replacement Parts Section

Recommended

Spare Parts List

Refer to the Custom Manual

SparePartsSectionforSpecicApplications

PleasehaveyourModel#andSalesOrder#availablewhenordering.

These are found on the compressor’s Name Plate.

105

Gaterotor Assembly

106

Gaterotor Assembly

Part totals indicated are for one gate rotor assembly, machines with two gate rotors will require

double the components listed below.

MODEL NUMBER

ITEM DESCRIPTION VSM 301 VSM 361 VSM 401

QTY VPN QTY VPN QTY VPN

100 SUPPORT ASSEMBLY 110 & 135B. 1 A25222AB 1 A25222AA 1 A25222AC

101 GATE ROTOR & DAMPER ASSEMBLY

111,120. 1 A25160AB 1 A25160AA A25160AC

102 GATE ROTOR SUPPORT ASSEMBLY

100, 101, 119 & 130. 1 A25161AB 1 A25161AA A25161AC

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

(1) 123, (1) 124. 1 A25165A 1 A25165A A25165A

110 SUPPORT. 1 25723D 1 25723C 1 25723B

111 GATE ROTOR. 1 25718B 1 25718C 1 25718D

114 SNAP RING. 1 2867L 1 2867L 1 2867L

115 RETAINER BALL BEARING 1 25935A 1 25935A 1 25935A

118 GATE ROTOR COVER GASKET. 1 25259B 1 25259B 1 25259B

119 WASHER WAVE SPRING. 1 3203A 1 3203A 1 3203A

120 DAMPER. 1 25760A 1 25760A 1 25760A

121* SHIM 0.002”. ar 25921AA ar 25921AA ar 25921AA

122* SHIM 0.003”. ar 25921AB ar 25921AB ar 25921AB

123* SHIM 0.005”. ar 25921AC ar 25921AC ar 25921AC

124* SHIM 0.010”. ar 25921AD ar 25921AD ar 25921AD

125 ROLLER BEARING. 1 2864F 1 2864F 1 2864F

126 BALL BEARING. 2 2865L 2 2865L 2 2865L

130 RETAINING RING. 1 2866H 1 2866H 1 2866H

131 RETAINING RING. 1 2867S 1 2867S 1 2867S

132 RETAINING RING. 1 2866J 1 2866J 1 2866J

135 DOWEL PIN 1 25910A 1 25910A 1 25910A

141 O-RING ROLLER BRG HSG. 1 2176L 1 2176L 1 2176L

143 O-RING BALL BRG SUPPORT. 1 2176F 1 2176F 1 2176F

155 SHIM ar 25977D ar 25977D ar 25977D

156 SHIM ar 25977C ar 25977C ar 25977C

ar = As required

107

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

MODEL NUMBER

ITEM DESCRIPTION VSM 501 VSM 601 VSM 701

QTY VPN QTY VPN QTY VPN

100 SUPPORT ASSEMBLY 110 & 135B. 1 A26011BB 1 A26011BA 1 A26011BA

101 GATE ROTOR & DAMPER ASSEMBLY

111,120. 1 A26002BB 1 A26002BA 1 A26002BC

102 GATE ROTOR SUPPORT ASSEMBLY

100, 101, 119 & 130. 1 A26003BB 1 A26003BA 1 A26003BC

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

(1) 123, (1) 124. 1 A26035B 1 A26035B 1 A26035B

110 SUPPORT. 1 26030BB 1 26030BA 1 26030BA

111 GATE ROTOR. 1 26032A 1 26031A 1 26033A

114 SNAP RING. 1 2867U 1 2867U 1 2867U

115 RETAINER BALL BEARING 1 25935B 1 25935B 1 25935B

118 GATE ROTOR COVER GASKET. 1 25259C 1 25259C 1 25259C

119 WASHER. 1 25007A 1 25007A 1 25007A

120 DAMPER. 1 25760A 1 25760A 1 25760A

121* SHIM 0.002”. ar 26027AA ar 26027AA ar 26027AA

122* SHIM 0.003”. ar 26027AB ar 26027AB ar 26027AB

123* SHIM 0.005”. ar 26027AC ar 26027AC ar 26027AC

124* SHIM 0.010”. ar 26027AD ar 26027AD ar 26027AD

125 ROLLER BEARING. 1 2864B 1 2864B 1 2864B

126 BALL BEARING. 1 2865B 1 2865B 1 2865B

130 RETAINING RING. 1 2866A 1 2866A 1 2866A

131 RETAINING RING. 1 2867A 1 2867A 1 2867A

132 RETAINING RING. 1 2866K 1 2866K 1 2866K

135 DOWEL PIN 1 25910A 1 25910A 1 25910A

141 O-RING ROLLER BRG HSG. 1 2176M 1 2176M 1 2176M

143 O-RING BALL BRG SUPPORT. 1 2176R 1 2176R 1 2176R

155 SHIM ar 25977G ar 25977G ar 25977G

156 SHIM ar 25977H ar 25977H ar 25977H

NOTE: * Not pictured

ar = As Required

Gaterotor Assembly

108

Shaft Seal

MODEL NUMBER

ITEM DESCRIPTION ALL VSM 301-401 ALL VSM 501-701

QTY VPN QTY VPN

* SHAFT SEAL KIT Viton Kit

219, 230, & 260. 1 KT709DG 1 KT709AG

219 SHAFT SEAL. 1 A 1 A

230 OIL SEAL. 1 2930C 1 25040A

244- TEFLON SEAL 1 25939A 1 25939A

252- RETAINER RING 1 2928M 1 2928M

260 O-RING 1 2176U 1 2176F

261 O-RING. (205 Only) 1 2176AE n/a

NOTE * Not pictured.

A Sold only as kit.

- See recommended spare parts lists for complete assembly.

109

Main Rotor, Slide Valve Cross Shafts & End Plate

Models VSM 301-401 Counter Clockwise ONLY

110

Main Rotor, Slide Valve Cross Shafts & End Plate

Models VSM 301-401 Counter Clockwise ONLY

MODEL NUMBER

ITEM DESCRIPTION VSM 301 VSM 361 VSM 401

QTY VPN QTY VPN QTY VPN

201 MAIN ROTOR ASSEMBLY. 1 A25226AB 1 A25226AA 1 A25226AC

203 OIL BAFFLE ASSEMBLY (1)

217, (1) 244, (1) 248, (1) 249, (1) 252. 1 A25942AA 1 A25942AA 1 A25942AA

SHIM ASSORTMENT (2) 240,

(2) 241, (1) 242, (1) 243 1 A25177A 1 A25177A 1 A25177A

217 OIL BAFFLE PLATE . 1 25938A 1 25938A 1 25938A

220 END PLATE. 1 25719D 1 25719D 1 25719D

221 SHAFT. 2 25941A 2 25941A 2 25941A

222 GEAR. 4 25027A 4 25027A 4 25027A

227 CLAMP. 4 25913A 4 25913A 4 25913A

228 SPACER. 4 25847A 4 25847A 4 25847A

240 SHIM 0.002” A 25409AA A 25409AA A 25409AA

241 SHIM 0.003” A 25409AB A 25409AB A 25409AB

242 SHIM 0.005” A 25409AC A 25409AC A 25409AC

243 SHIM 0.010” A 25409AD A 25409AD A 25409AD

244 TEFLON RING. 1 25939A 1 25939A 1 25939A

248 CHECK VALVE. 1 3120A 1 3120A 1 3120A

249 CHECK VALVE. 1 3120B 1 3120B 1 3120B

252 RETAINING RING 1 2829M 1 2829M 1 2829M

268 EXPANSION PIN. 4 1193D 4 1193D 4 1193D

269 EXPANSION PIN. 4 2981AA 4 2981AA 4 2981AA

271** PLUG SOLID 1 25422A 1 25422A 1 25422A

281 HEX HEAD CAP SCREW. 6 2796N 6 2796N 6 2796N

286 SOCKET HEAD CAP SCREW. 8 2795F 8 2795F 8 2795F

297 SET SCREW. 2 2060J 2 2060J 2 2060J

298 SET SCREW. 2 2060H 2 2060H 2 2060H

NOTE: * Not pictured.

** Required at top locate single gaterotor only.

A As required.

111

Main Rotor, Slide Valve Cross Shafts & End Plate

Models VSM 501-701 Clockwise ONLY

112

MODEL NUMBER

ITEM DESCRIPTION VSM 501 VSM 601 VSM 701

QTY VPN QTY VPN QTY VPN

201 MAIN ROTOR ASSEMBLY. 1 A26010BB 1 A26010BA 1 A26010BC

203 OIL BAFFLE ASSEMBLY (1) 217,

(1) 244, (1) 248, (1) 249, (1) 252. 1 A26034B 1 A26034B 1 A26034B

SHIM ASSORTMENT (2) 240,

(2) 241, (1) 242, (1) 243 1 A25177B 1 A25177B 1 A25177B

220 END PLATE. 1 26025B 1 26025B 1 26025B

221 SHAFT. 2 25843A 2 25843A 2 25843A

222 GEAR. 4 25027A 4 25027A 4 25027A

228 SPACER. 4 25847A 4 25847A 4 25847A

240 SHIM 0.002” A 25255AA A 25255AA A 25255AA

241 SHIM 0.003” A 25255AB A 25255AB A 25255AB

242 SHIM 0.005” A 25255AC A 25255AC A 25255AC

243 SHIM 0.010” A 25255AD A 25255AD A 25255AD

244 TEFLON RING. 1 25929B 1 25929B 1 25929B

248 CHECK VALVE. 1 3120A 1 3120A 1 3120A

249 CHECK VALVE. 1 3120B 1 3120B 1 3120B

252 RETAINING RING 1 2928N 1 2928N 1 2928N

255 WASHER 2 25977E 2 25977E 2 25977E

256 WASHER 2 25977F 2 25977F 2 25977F

268 EXPANSION PIN. 4 1193D 4 1193D 4 1193D

269 EXPANSION PIN. 4 2981AA 4 2981AA 4 2981AA

281 HEX HEAD CAP SCREW. 8 2796B 8 2796B 8 2796B

282 SOCKET HEAD CAP SCREW 2 2795D 2 2795D 2 2795D

297 SET SCREW. 2 2060J 2 2060J 2 2060J

298 SET SCREW. 2 2060H 2 2060H 2 2060H

NOTE: * Not pictured.

A As required.

Main Rotor, Slide Valve Cross Shafts & End Plate

Models VSM 501-701 Clockwise ONLY

113

Volume Ratio

Capacity Slide

Carriage Assembly

Slide Valve Carriage Assembly

Assembly Includes Carriage and Slides.

114

Slide Valve Carriage Assembly

MODEL NUMBER

ITEM DESCRIPTION ALL VSM 301-401 ALL VSM 501-701

QTY VPN QTY VPN

300 CARRIAGE ASSEMBLY. 1 A25179A 1 A26012B

304 CAPACITY PISTON 340, 341, 350 & 355. 1 A25183A 1 A25183B

305 VOLUME PISTON 340, 342, 350 & 355. 1 A25184A 1 A25184B

316 CAPACITY RACK. 1 25023D 1 25024A

318 CAPACITY RACK SHAFT. 1 25772C 1 25772A

323 VOLUME RATIO RACK. 1 25023C 1 25023A

325 VOLUME RATIO RACK SHAFT. 1 25772D 1 25772B

350 PISTON RING SET. 2 2953AE 2 2953AA

360 LOCK WASHER (PAIR). 2 3004C 2 3004C

361 WASHER. 2 13265B 2 13265B

363 NUT. 4 2797A 4 2797A

372* SOCKET HEAD CAP SCREW. N/A 1 2795M

Notes:There are two slide valve carriages per compressor. Each one each has its

own Volume Ratio and Capacity slide valves. The above totals are per side of the

compressor, double the quantities if both slide valve carriages are being worked

on.

*.Not Pictured.

115

Actuator & Command Shaft

116

MODEL NUMBER

VSM 291 thru VSS 751 thru VSS 1051 thru VSS 1551 thru

ITEM DESCRIPTION VSM 601 VSS 901 VSS 1201 VSS 2101

QTY VPN VPN VPN VPN

400 COMMAND SHAFT ASSEMBLY 2 A25994B A25994C A25994D A25994E

401 SLIDEVALVE ACUATOR 2 25972D 25972D 25972D 25972D

446 2 2176X 2176X 2176X 2176X

Actuator & Command Shaft

117

Model VSM 501-701

Miscellaneous Frame Components

Model VSM 301-401

118

MODEL NUMBER

ITEM DESCRIPTION ALL VSM 301-401 ALL VSM 501 - 701

QTY VPN QTY VPN

512 MANIFOLD GASKET. 1 25737A 1 26037A

514 ECON-O-MIZER GASKET. 2 11323GG 2 11323D

522 COUPLING LOCK PLATE n/a 1 25004D

523 LOCK WASHER n/a 1 3004H

528 ECON-O-MIZER PLUG. 2 25419A 2 25397K

530 O-RING n/a 2 2176BF

540 DOWEL PIN 2 2868B 2 2868B

542 PIPE PLUG 3 2606C 10 2606B

551 HEX HEAD CAP SCREW n/a 2 2796C

570 BEARING OIL PLUG 1 25978A n/a

571 PLUG 1 25979A n/a

572 SPRING 1 3148A n/a

Notes*. Not Pictured.

Miscellaneous Frame Components

119

Housing Accessories

Miscellaneous Frame Components

120

MODEL NUMBER

ITEM DESCRIPTION VSM 301 - 701

QTY VPN

117 GATE ROTOR COVER. 1 25416B

118 COVER GASKET. 2 25259B

129 GASKET. 1 11323T

180 INLET SCREEN. 1 25920A

343 PISTON COVER. * 1 25724B

Housing Accessories

Miscellaneous Frame Components

MODEL NUMBER

ITEM DESCRIPTION VSM 301 - 401 VSM 501 - 701

QTY VPN QTY VPN

345 O-RING. 4 2176BX 4 2176CA

346 O-RING. 2 2176BG 2 2176BG

121

MODEL NUMBER

ITEM DESCRIPTION ALL VSM 301-401 ALL VSM 501-701

QTY VPN QTY VPN

901 GATEROTOR STABILIZER. 1 25742A 1 25742B

902 SEAL INSTALLATION TOOL 1 25455A 1 25455B

Replacement Tools

122

Suction

Gas

Strainer

Stop

Va l v e Check

Va l v e

Manually Shut Off Valve to Oil Filter

Manually Open Valve

Run Oil Pump for a minimum

of 5 Minutes and as long as

needed to purge all gas from

oil cooler and piping.

Shut Oil Pump Off.

Open Valve to Oil Filter.

Close Valve #3.

Verify Oil is in Separator



Follow the Steps Below:

Note: Bottom Site Glass Should Be Full.

Pre Start Up for Proper Oil Separator Level and to Prime the Cooler

Remote Coolers Only

Shows the Flow for Priming the Oil Cooler (Steps 1-5)

Shows the Flow for Priming the Compressor Prior to

Start Up (Steps 6-11)

Very Important: Piping of the oil must enter the

bottom connection of the oil cooler and leave

the top connection.

WARNING: Failure to Follow These Steps Will Result in

Bearing Damage and Compressor Seizing and Will Void

Any and All Warranties That May Apply.

IMPORTANT! FOR REMOTE OIL COOLERS ONLY. READ BEFORE PROCEEDING.

SG Ball Valve

Metering Valve

Manually Close 2a

Open Valve 2a

 =

123

124 Vilter Manufacturing LLC are trademarks of Emerson Electric Co. or one of its affi liated companies.

Vilter Manufacturing LLC

P.O. Box 8904

Cudahy, WI 53110-8904

P 414 744 0111

F 414 744 1769

www.vilter.com

EmersonClimate.com

35391S Rev. 06

Emerson Air Compressor VSR Brands Vilter Manual VSM VSS

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