Emerson Vsm Users Manual 35391S Rev 08b Booklet.indb

Emerson Air Compressor 450XL 35391S_Rev_08b

0020ab6d-0f13-4264-953b-fba9d83b13ec Emerson Air Compressor VSR User Guide |

2015-01-05

: Emerson Emerson-Vsm-Users-Manual-165002 emerson-vsm-users-manual-165002 emerson pdf

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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

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

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

Standard VILTER 5/15 Warranty Statement ..........................................................................7

Long Term Storage Requirements .........................................................................................8

Description .........................................................................................................................10

Foundation .........................................................................................................................12

Rigging and Lifting .............................................................................................................19

Installation .........................................................................................................................23

Slide Valve Actuator Installation & Calibration ...............................................................35

Slide Valve Operation ....................................................................................................38

Slide Valve Actuator Trouble Shooting Guide .................................................................39

Operation Section ..............................................................................................................43

Notice on using Non-Vilter Oils ......................................................................................43

Operation .....................................................................................................................44

Pre Start-Up Checklists ..................................................................................................52

Field Piping and Mechanical Requirements ....................................................................53

Field Wiring Requirements ............................................................................................54

Stop Check Valve Operation ..........................................................................................55

Service ..........................................................................................................................56

Maintenance .................................................................................................................87

VSS Parts Section ................................................................................................................88

Gate Rotor .....................................................................................................................89

Shaft Seal ......................................................................................................................93

Main Rotor ....................................................................................................................94

Slide Valve Cross Shafts and End Plate ............................................................................96

Slide Valve Carriage Assembly .......................................................................................98

Actuator & Command Shaft .........................................................................................102

Miscellaneous Frame Components ..............................................................................104

Replacement Tools ......................................................................................................108

VSM 301-701 Replacement Parts Section ..........................................................................111

Gaterotor Assembly ....................................................................................................112

Shaft Seal ....................................................................................................................115

Main Rotor, Slide Valve Cross Shafts & End Plate ..........................................................116

Slide Valve Carriage Assembly .....................................................................................120

Actuator & Command Shaft .........................................................................................122

Miscellaneous Frame Components ..............................................................................124

Replacement Tools ......................................................................................................128

Danfoss Liquid Injection Valve Setup .................................................................................129

Appendix A: Pre Start Up for Remote Oil Coolers ...............................................................143

Standard VILTER Warranty Statement

Seller warrants the products it manufactures to be free from defects in material and workmanship for a period of

eighteen (18) months from the date of shipment from Seller’s manufacturing plant or twelve (12) months from

date of installation at the initial end users location, whichever occurs first. In addition, Seller provides the following

extended warranties: (a) three (3) years from the date of shipment on single screw compressor internal rotating

parts, (b) two (2) years from the date of shipment on reciprocating compressors and single screw and reciprocat-

ing compressor parts, and (c) two (2) years on all other parts on a single screw compressor unit. Such warranties

do not apply to ordinary wear and tear. Seller does not warrant that the product complies with any particular law

or regulation not explicitly set forth in the specifications, and Buyer is responsible for ensuring that the product

contains all features necessary to safely perform in Buyer’s and its customer’s plants and operations. Buyer must

notify Seller of any warranty claim within ten (10) days after such claim arises, otherwise Buyer waives all rights to

such claim. Products supplied by Seller, which are manufactured by others, are not warranted by Seller, but rather

Seller merely passes through the manufacturer’s warranty to Buyer.

SELLER EXPRESSLY DISCLAIMS ALL OTHER WARRANTIES, WHETHER EXPRESS OR IMPLIED, INCLUDING THE

IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Unless otherwise agreed in writing, Buyer’s sole remedy for breach of warranty is, at Seller’s option, the repair of

the defect, the correction of the service, or the providing a replacement part FOB Seller’s office. Seller will not be

responsible for costs of dismantling, lost refrigerant, reassembling, or transporting the product. Further, Seller will

not be liable for any other direct, indirect, consequential, incidental, or special damages arising out of a breach of

warranty. THESE WARRANTY REMEDIES ARE EXCLUSIVE AND ALL OTHER WARRANTY REMEDIES ARE EXCLUDED.

Products or parts for which a warranty claim is made are to be returned transportation prepaid to Seller’s factory.

Any improper use, corrosion, neglect, accident, operation beyond rated capacity, substitution of parts not approved

by Seller, or any alteration or repair by others which, in Seller’s judgement, adversely affects the Product, shall void

all warranties and warranty obligations. Further, Seller shall not be liable under the above warranties should Buyer

be in default of its payment obligations to Seller under this Agreement or any credit agreement.

The seller extends warranty, from date of shipment, to a period of fifteen (15) years on all compressor bearings,

five (5) years on all internal compressor parts and two (2) years on the remainder of the parts on single screw

compressor units. 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 Seller’s receiving written

notice of any alleged defect within ten (10) days after its discovery and, at Seller’s option, return of such parts to

Seller, F.O.B., freight prepaid to Seller’s factory. Expenses incurred by Buyer in repairing or replacing any defec-

tive product or any lost refrigerant will not be allowed except by written permission of Seller. This warranty is

only applicable to products properly maintained and used according to Seller’s instructions, the use of genuine

Vilter replacement parts and recommended oil in all repairs and replacements has demonstrated adherence to a

scheduled maintenance program as detailed in the Single Screw Compressor operating manual. This warranty

does not apply to normal wear and tear, or damage caused by corrosion, misuse, overloading, neglect, improper

operation, accident or alteration, as determined by Seller. 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 the Seller may have from the original manufacturer. Labor and expenses

for repair are not covered by warranty.

THE WARRANTY CONTAINED IN THIS SECTION IS EXCLUSIVE AND IN LIEU OF ALL OTHER REPRESENTATIONS

AND WARRANTIES (EXCEPT OF TITLE), EXPRESS OR IMPLIED WARRANTY OF MERCHANTABILITY OR IMPLIED

WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE.

Any description of the product, 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 war-

ranty. 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 5/15 Extended

Warranty shall be applicable only if the specific maintenance guidelines as outlined in the technical manual are

followed. This includes the compressor inspections, completing periodic oil analysis and the change out of the

oil and oil filters, and related components as required with only genuine Vilter parts. The customer is required to

keep a maintenance log and receipts demonstrating the use of Genuine Vilter parts for validation of a warranty

claim, if requested.

Note: The 5/15 warranty applies to NEW compressors only, and does NOT include used or remanufactured compressors.

Standard VILTER 5/15 Warranty Statement

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 ﬁ 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 veriﬁ 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, ﬂ 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 speciﬁ 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 destruc-

tion exists. Sealing motor openings should restrict access to the motor.

4) Rotate motor and compressor shafts several revolutions (approximately 6) per month to eliminate ﬂ 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.

COMPRESSOR

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

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

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

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

until the time when the screw ﬂ 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 conﬁ 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 ﬁ 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 ﬁ 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 ﬂ ange, at the driven end of the unit. The

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

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

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

screw ﬂ 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 ﬁ lm

of oil for the mechanical shafts seal. Excess oil ﬂ ows through the check valves on the sealing bafﬂ 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 ﬂ ute of the main screw.

Once the gas is swept from the main screw ﬂ 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 ﬂ ute and

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

ﬂ 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 ﬂ 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 speciﬁ c process set points. By continuously adjusting the

ﬂ 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 efﬁ ciency of the compressor by matching the gas pressure within the screw ﬂ 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 ﬂ ute continues until the screw rotates

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

discharge port and the compressed gas is expelled from the screw ﬂ 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 ﬂ 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 efﬁ ciency is maximized. Proper positioning of the volume ratio slide prevents either over

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

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

Description

Foundation

Introduction

Vilter Single Screw compressor units are low vibration machines. Under most conditions, no elaborate foundation is

necessary. However a sound foundation maintains motor alignment and proper elevation, and is therefore required.

Provided are recommendations for the foundation and anchoring of the compressor unit. The Vilter foundation sup-

ports the entire operating weight of the unit and is suitable for years of continuous duty. Included are speciﬁ cations

for concrete, rebar, aggregate, anchors and grout.

Considerations Prior to Starting

Consult professionals, such as building inspectors, structural engineers, geotechnical engineers and/or construction

contractors prior to starting. Below are a few points to consider:

Site Characteristics:

• Soil information

• Site drainage

• Wind data

• Seismic zone

• Ingress and egress

• Power and power lines

Site Layout:

• Plant elevations, grading, drainage and erosion

• Accessibility to compressors for service

• Location of surrounding buildings

• Property lines and roadways

• Power

• Fire safety

Safety:

NOTE

Always check with a safety engineer before proceeding.

• Arranging equipment with adequate access space for safe operation and maintenance

• Wherever possible, arrange equipment to be served by crane. If not feasible, consider other handling methods

• Make all valves and devices safely accessible

• Use special bright primary color schemes to differentiate service lines

• Lightening protection for outdoor installations

• Relief valve venting

Foundation Materials

Materials needed to build the foundation are forms, concrete, sand, rebar, wire, grout, anchor bolts, expansion board

and shims. A set of concrete forms will need to be acquired; generally, these can be rented or constructed from

dimensional lumber. There should be enough 4,000 psi concrete with one inch aggregate to build the foundation.

Also, there should be enough sand to provide a base of compacted sand four inches thick for the foundation to rest

on, see Figure 1 - Concrete Pad with Compressor Unit Dimensions - Side View. The rebar required is ASTM 615, grade

60, sizes #4 and #6. Wires will also be needed to tie the rebar together. The recommended grout is Masterﬂ ow 648CP

high performance non-shirk grout to provide at least a 1” thick pad under each foot. The recommended anchors are

5/8” Diameter HILTI HAS SS threaded rod for outdoor installations or HAS-E rods for indoor installations. Anchor bolts

shall have a ﬁ ve inch projection and 12-3/8” embedment. The required adhesive is HIT-ICE/HIT/HY 150 anchoring

system. There should be enough one inch expansion boards to go around the perimeter of the foundation. Finally

there should be enough shim stock and extra anchor bolt nuts to level the compressor unit.

Building the Foundation

Use the Vilter General Arrangement (GA) and foundation drawings to help secure a building permit and foundation

construction. The Vilter GA drawing will have the necessary dimensions required to determine the overall founda-

tion size and where to locate the compressor unit on the foundation. It will also show the dimensions required to

form up the housekeeping piers that the compressor unit rests on. The Vilter foundation drawing lists the necessary

information to construct a suitable foundation. It includes the rebar requirements and locations. It also shows anchor

bolt locations, grouting and the concrete speciﬁ cations. Using the Vilter GA drawing, Vilter foundation drawing and

the information from site characteristics, site layout and safety studies will provide enough data to allow building

the foundation to proceed.

The foundation is to be cast and permanently exposed against the earth. Therefore, if constructing on an existing

ﬂ oor, typically indoors, the ﬂ oor will need to be broken up to get to the earth. If starting from undisturbed soil, it

must be also be prepared accordingly. In either case, these are some check points to consider:

• Check the depth of your frost line to ensure the foundation extends below it

• Ensure the foundation rests entirely on natural rock or entirely on solid earth, but never on a combination

of both

• Check the ability of the soil to carry the load

• Check wet season and dry season soil characteristics for static loading limits and elasticity

• Check local codes for Seismic Design requirements

For examples of foundation diagrams, refer to Figure 1 - Concrete Pad with Compressor Unit Dimensions - Side View

and Figure 2 - Concrete Pad with Compressor Unit Dimensions - Front View

CENTER LINE OF

GAS COMPRESSION

SYSTEM

EL. TOP OF

GRADE

# 6 @ 12"

EACH WAY

TOP & BOTTOM

3" CLR. 2" CLR.

1'-0"

COMPRESSOR UNIT

2" (TYP.)

G.A.

EXCAVATE TO FROST DEPTH AS REQ'D AND BACKFILL

WITH CLSM OR NON-FROST SUSCEPTIBLE FILL

4" COMPACTED

SAND

Figure 1. Concrete Pad with Compressor Unit Dimensions - Side View

Foundation

CENTER LINE OF

GAS COMPRESSION

SYSTEM

# 6 @ 12"

EACH WAY

TOP & BOTTOM

COMPRESSOR UNIT

G.A.

EL. TOP OF

GRADE

EXCAVATE TO FROST DEPTH AS REQ'D AND BACKFILL

WITH CLSM OR NON-FROST SUSCEPTIBLE FILL

Figure 2. Concrete Pad with Compressor Unit Dimensions - Front View

Once the site has been excavated and prepared, place four inches of sand down on the bed where the foundation will

rest. The sand must be compacted before placing the forms and rebar. After the sand is compacted, use the Vilter GA

drawing to construct the forms for the foundation. With forms in place, install expansion boards on the inside of the

forms, for example, see Figure 3 - Interior Foundation Isolation. Next, place your rebar in the forms as per the Vilter

foundation drawing. When all rebars are in place the concrete can be poured. The concrete must then be trolled level

and a surface texture etched in place. Leave the concrete to cure for at least 28 days.

CONCRETE

SLAB IN

BUILDING

CHAMFER EDGE

COMPRESSOR UNIT

FOUNDATION

ISOLATION JOINT,

1" MINIMUM

THICKNESS

6”

Figure 3. Interior Foundation Isolation

Foundation

Compressor Unit Installation

Once the foundation has cured, the compressor unit can be placed on the foundation, see Figure 4. Foundation with

Housekeeping Pads Dimensions - Top View and Figure 5. Housekeeping Pad Dimension Detail - Top View. With the

appropriate material handling equipment, lift the compressor unit by locations shown on the Vilter GA drawing and

slowly place it on the foundation housekeeping piers. As per the Vilter GA drawing, ensure the compressor unit is

correctly placed on the foundation. Once placed, use the spherical washers directly under the compressor as the

surface to level the compressor unit, see Figure 6 - Compressor with Spherical Washers. Place shims under the feet

of the compressor unit, as needed, until it is leveled, see Figure 7 - Concrete Pad Housekeeping Detail. Select the

correct drill bit and drill thru the anchor bolt hole in the mounting feet of the compressor unit to the depth called

for on the Vilter foundation drawing. Finally using the HILTI instructions, put your anchor bolts in place and wait for

them to cure. Then place the nuts on the anchor bolts to ﬁ nger tight and prepare to grout.

CENTER LINE GAS

COMPRESSION

SYSTEM

10'-0"

5'-0"

OVER ALL G.A. LENGTH + 4'-0"

Figure 4. Foundation with Housekeeping Pads Dimensions - Top View

Foundation

5/8" DIA. HILTI HAS SS THREADED ROD

(HAS-E RODS ARE ACCEPTABLE FOR INTERIOR

INSTALLATIONS) INSTALLED USING

HIT-ICE/HIT-HY 150 ADHESIVE ANCHORING

SYSTEM.

(5" PROJECTION, 12 3/8" EMBEDMENT.)

HOLES TO BE INSTALLED WITH HAMMER DRILL.

DO NOT DIAMOND CORE. (TYP.)

CENTER LINE

G.A.

G.A. + 2"

G.A.G.A.

1" (TYP.)

(5) - # 6 VERT.

WITH STD. 90° HOOK

AT BOTTOM EACH

FACE

(2) - # 4

CLOSED TIES

Figure 5. Housekeeping Pad Dimension Detail - Top View

SPHERICAL

WASHER

SPHERICAL

WASHER

Figure 6. Compressor with Spherical Washers

Foundation

010Ä5*4+0-

'21:;)4176

4'%1//'0&'&

(14

*175'-''2+0)

%10%4'6'

$#5'

70+6.')

*1.&&190076

9#5*'4

.'8'.+0)076

#0%*14$1.6

/+0

Figure 7. Concrete Pad Housekeeping Detail

Leveling and Grouting

The unit should be level in all directions. Wet the concrete pad according to the grout manufacturer’s directions. Mix

a sufﬁ cient amount of grout. The grout must be an expanding grout rather than shrinking to provide a tighter bond.

Follow the manufacturer’s recommendations for setting, precautions, mixing, and grout placement, ﬁ nishing and

curing. The grout must be worked under all areas of the feet with no bubbles or voids. If the grout is settled with a

slight outside slope, oil and water can run off of the base. Once the grout has cured, torque the anchor bolts as per

HILTI instructions.

Piping Connections

Piping Stress

Once the screw compressor package has been installed, properly grouted and anchored, it is imperative that the

piping bolted to the screw compressor not impose excessive forces on the compressor. Suction and discharge lines

should be supported so the lines will not move if disconnected from the compressor.

Additional Information

Codes and Standards

Vilter followed the following codes and standards when designing your foundation:

• ACI

• ASTM

• ASCE 7

• IBC 2006

Foundation

Operation and Performance

The foundation was designed for:

• Outside environment severe exposure

• Ambient temperature -10 degrees F to 105 degrees F

• Unit weight 20,000 lbs

• RPM 3600

• Soil bearing capacity 1,500 lbs/sq.ft.

• Wind speed 120 MPH

• Exposure factor D

• Wind importance factor 1.15

• Concrete poured on and permanently cast against the earth

General Design Requirements

The compressor foundation is designed to:

• Maintain the compressor in alignment and at proper elevation.

• Minimize vibration and prevents its transmission to other structures

• Provide a permanently rigid support

• Provide sufﬁ cient depth to dampen vibrations.

Foundation

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 speciﬁ 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 speciﬁ 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 scientiﬁ 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 ﬁ 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 ﬁ nalized and distributed for review and com-

ment.

The Plan should clearly deﬁ ne requirements, expectations and speciﬁ 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 classiﬁ 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 conﬁ rm that each Participant understands both the broader Plan and their speciﬁ 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 conﬁ 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;

• Conﬁ rm that the crane operator is qualiﬁ ed to work on the site;

• Get third-party conﬁ 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 signiﬁ 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 speciﬁ cations;

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

• Determine the initial position, ﬁ 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 qualiﬁ 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 speciﬁ c feedback on the Plan or provide a speciﬁ 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 ofﬁ ce

should be notiﬁ 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 1301 6,750 6,750

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 ﬂ oor

or foundation upon which the unit will be placed

should be designed to support the entire op-

erating weight of the unit. See Table 1 for unit

weights. See Foundation, page 12, for additional

foundation instructions.

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 ﬂ 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.

III. 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.

Installation

Care must be taken to avoid trapping the lines ex-

cept for speciﬁ c purposes. When traps are 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 ﬁ ttings.

Common pipe ﬁ 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 ﬁ 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 ﬁ 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 ﬁ 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 ﬂ exibility. This must

be done to prevent vibration being transmitted

through the pipe lines to the buildings. One

method of providing the needed ﬂ 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

ﬁ ttings where possible. The use of screw type

ﬁ 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 ﬁ ttings for Halocarbon

piping, only wrought copper ﬁ ttings should be

used. Cast ﬁ 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 ﬁ ttings are available and these may

be used with complete safety.

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

able. However, specially tested cast ﬁ 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 ﬂ exible

pipe couplings as close to the compressor unit

as possible with connections run in two different

directions, 90° apart. These ﬂ 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.

IV. 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 ﬁ eld mounted starters and package mounted

motors.

Additional control wiring in the ﬁ 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.

V. TESTING REFRIGERATION

SYSTEM FOR LEAKS

Vilter equipment is tested for leaks at the factory.

One the most important steps in putting a refrig-

eration system into operation is ﬁ eld testing 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 pres-

sure must be built up. Test pressures for various

refrigerants are listed in ANSI B9.1-1971 code

brochure entitle “Safety Code for Mechanical

Refrigeration”. These pressures will usually suf-

ﬁ 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 ﬂ 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

Installation

valves on the lowest part of the system so the gas

will ﬂ oat away from the compressor. This pre-

vents 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

ﬂ 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 ﬁ 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.

VI. 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 ﬁ 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 speciﬁ c

lubricating oils. Use of oil not speciﬁ ed or sup-

plied by Vilter will void the compressor warranty.

Please contact your local Vilter representative or

the Home Ofﬁ ce for further information.

VII. 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 ﬁ 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 satisﬁ 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 satisﬁ 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-

ﬁ 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”.

VIII. 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 ﬁ lter inlet and outlet pres-

sures for excessive pressure drop. Change

ﬁ lter when pressure drop exceeds 45 psi or

every six months, whichever occurs ﬁ rst. For

proper procedure for changing micronic oil

ﬁ lter and for charging oil into the system, see

Operation Section.

4. Clean strainers each time ﬁ 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 ﬂ 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 ﬂ 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 ﬁ 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 ﬁ 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. Retroﬁ tting a ﬁ eld installation will

require replacing the bonnet assembly.

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

The drill ﬁ 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 ﬁ t. The key(s)

should have a snug side-to-side ﬁ 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 ﬁ t, heat the hub in an oil bath or oven until

bore is sufﬁ ciently larger than the shaft. 350º F.

is usually sufﬁ cient. An open ﬂ ame is not recom-

mended. However, if ﬂ 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 ﬁ 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 ﬁ 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 ﬂ 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 (ﬂ 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 ﬂ exing element that is centered and

parallel to its mating ﬂ 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 speciﬁ cations.

3. Angular Alignment. Rigidly mount a dial indicator

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

hub ﬂ 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 ﬂ ange.

4. Parallel Offset. Rigidly mount a dial indicator on

one hub or shaft, reading the other hub ﬂ 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 ﬂ ex

elements. See drawing below.

Note: If the driver or driven equipment alignment

speciﬁ cation is tighter than these recommendations,

the speciﬁ 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 ﬁ t

through the holes in the ﬂ 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, ﬁ 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 ﬁ 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 ﬁ rst. Now install the rest of the long

bolts in the same manner.

Note: Alignment of C-Flange Units should be

checked when compressor or motor are replaced.

Installation

4. Torque the long bolt locknuts at this time.

NOTE: With the coupling in good alignment, the bolts

will ﬁ t through the holes in the ﬂ 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. Brieﬂ 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 ﬂ 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 speciﬁ 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

red LED will begin flashing rapidly.

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 ﬂ 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 ﬂ 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

ﬂ 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 qualiﬁ 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 qualiﬁ 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 Separator

The refrigerant-oil mixture is led into the first part

of oil separator. There, the first step of oil separa-

tion is performed by a combined agglomerator/

demister. At the same time, these part of the oil

separator serves as oil collector.

In the second part of the oil separator, the fine

separation of the aerosol oil portion from the re-

frigerant is performed by means of replaceable fine

oil separation cartridges. The oil separated in the

fine section of the oil separator is returned to the

compressor via an additional injection orifice.

C. 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, VSS Units using Vilter Part

Number 1833C oil ﬁ 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

Operation

1833C

Filter

Element

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 out-

let 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.

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 direc-

tion. Remove 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 re-

frigeration 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.

LOCKING

RING

FILTER

ELEMENT

FILTER

TANK

INLET

OUTLET

Operation

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 re-

turning to service.

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

returning to service.

D. 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.

E. Oil Cooling

1. Water Cooled Oil Cooler

In lieu of the three way oil temperature valve

to control the temperature of the oil used for

lubrication and cooling of the compressor, it is

required to install a water regulating valve and

solenoid valve combination to control the water

supply to the oil cooler. The water inlet connec-

tion should be made on the bottom and the

outlet connection on the top. The water supply

is controlled by the water regulating valve to

maintain the oil temperature at approximately

120°F.

Operation

FIGURE 3.

TYPICAL WATER COOLED OIL COOLER

DIAGRAM

The solenoid valve provides positive water shut-

off when the compressor is not in operation. A

temperature of 150°F is considered high in most

circumstances and the compressor is protected by

a safety control to prevent operation of the com-

pressor above this temperature. Unless otherwise

specified, the oil cooler is sized for an 85°F water

inlet temperature and 10°F temperature rise.

2. Liquid Injection Oil Cooling.

The components are furnished with liquid injec-

tion for a typical system. The liquid solenoid valve

opens whenever the compressor is in operation.

The thermostatic expansion valve controls the

flow of liquid refrigerant to the compressor injec-

tion port in response to the discharge tempera-

ture. The discharge temperature is maintained at a

minimum of 120°F with a maximum of 140°F. The

discharge temperature can be adjusted either of

two ways. First, the small outlet pressure regula-

tor can be used to adjust superheat. Normally, this

regulator should be adjusted to maintain 70 psig

pressure at the external equalizing port of the ex-

pansion valve. Raising the pressure beyond 70 psig

tends to raise the discharge temperature, while

lowering the pressure lowers the discharge tem-

perature. Secondly, the standard superheat adjust-

ing screw on the thermostatic expansion valve can

be used to adjust the discharge temperature.

FIGURE 4.

TYPICAL LIQUID INJECTION OIL COOLING

SCHEMATIC DIAGRAM

Liquid injection cooling on booster compressors

is handled in the following manner. Using high

pressure liquid, the point of injection can be the

discharge line and no horsepower penalty is paid

by injecting liquid into the compressor discharge

line. The high pressure gas source normally used

for the pressure regulator would be compressor

discharge pressure. Since, on a booster unit, this

intermediate pressure is very rarely as high as the

nominal setting of 70 psig, high stage discharge

gas is used. On high stage compressors, the liquid

is injected directly into the compressor. However,

there is a horsepower penalty when the liquid is

injected into the compressor. This will vary with

refrigerant and operating condition. The liquid

is injected into the compressor at a point in the

compressor cycle that minimizes the brake horse-

power penalty.

3. V-PLUS Oil Cooling System

This system consists of a liquid pump, shut-off

valves, motor, solid state variable speed controller

and solid state temperature controller. This meth-

od of oil cooling is not available on the VSM or VSR

compressor units. The pump and solenoid valve

cycle on and off in parallel with the compressor

drive motor. The temperature controller receives a

temperature signal from the sensor located in the

discharge and oil lines and in turn, sends a signal

to the motor speed controller.

Operation

As the oil and desupserheating load varies, the

temperature controller adjusts the speed of the

pump/motor combination to maintain a constant

oil temperature.

NOTE:

See separate V-PLUS® instruction manual for de-

tailed start-up and operation.

4. Thermosyphon Oil Cooling

Using a brazed plate or an one pass shell and tube

type vessel, similar to the water cooled oil cooler,

oil is circulated on the shell side and liquid re-

frigerant from the receiver is circulated through

the tubes. Thermosyphon systems use a 3-way

temperature sensing control valve to regulate oil

at 120°F. Oil is bypassed around the thermosyphon

oil cooler. When oil is higher than 120°F, the oil is

passed through the thermosyphon oil cooler. A

1/4” tubing line w/valve adds high pressure gas to

the oil to quiet the sound of injection. Open this

valve in small amounts, until noise subsides. The

closed type cooling circuit is free from the foul-

ing problems associated with open circuit water

cooling. Since the oil cooling load is rejected in

the condenser, this type of cooling is practical.

The temperature limits here are the same as those

regarding the water cooled oil coolers.

5. Oil Pump

This system is designed to provide adequate com-

pressor lubrication when there is low differential

oil pressure across the compressor suction and

discharge for some high stage applications and

booster applications as required.

On start-up, the control system will calculate the

pressure differential between the compressor oil

manifold & suction pressure. If this differential

pressure ratio is less than 2.8:1, then the oil pump

will turn on and will continue to run until the pres-

sure ratio is 3.0:1.

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.

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

Operation

“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 5.

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 ﬁ 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.

NOTE: These refer to the old style gear motors and DO NOT apply to the new optical motors.Rotation for the

optical motors is the OPPOSITE of what is shown in the chart.

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

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

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

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

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

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

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

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

VSS 791 CCW CW CCW CW 1.22 / 439 / 4.777” 0.74 / 266 / 2.889”

VSS 891 CCW CW CCW CW 1.22 / 439 / 4.777” 0.74 / 266 / 2.889”

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

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

VSS 1301 CCW CW CCW CW 1.22 / 439 / 4.777” 0.74 / 266 / 2.889”

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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 6.

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 compres-

sor at 100% capacity.

C. 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.

HAND EXPANSION

VALVE

TO COMPRESSOR

STRAINER

SIGHT

GLASS

VALVE

CHECK

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 (Conﬁ 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 ﬂ 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 ﬂ ow in either

direction.

OPEN

In the manually ” Open Position”, with

the valve stem fully back seated, the

valve disc is lifted slightly, allowing ﬂ 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-

ﬂ ange/compressor assembly must be supported

with a chain fall or other lifting device before the

bolts holding the compressor to the C-ﬂ 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-ﬂ 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 ﬁ rst, before the

compressor manifold ﬂ 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

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.

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

rectiﬁ ed. At this time, the bearing ﬂ 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 ﬂ 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 ﬂ 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) NOTE: Readings could be higher than 0.020.

If readings are greater than 0.030 over table

tolerance contact Vilter’s home office.

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 ﬂ oat and this should not

exceed 0.003”.

C) Gate rotor bearing ﬂ 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 ﬂ oat. Refer to

table 0.2 to ﬁ nd the maximum blade to sup-

port ﬂ 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 THRU VSS 1301 0.060”

VSS 1551 & VSS 2101 0.060”

Service

For VSS 751/901 & VSS 1051 THRU 1301

compressors, use side rails and assemble

to gaterotor stabilizer

as stamped.

Drive End

GATE ROTOR ASSEMBLY CAUTION

Gate rotor removal and assembly is divided into

distinct instructions, instructions for all VSS 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 1301 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

For VSM 451 thru 601

compressors, do not

use side rails.

901D

901C

901B

901A

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 ﬂ 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.

Service

E) Remove plug on the thrust bearing housing.

Loosen the socket head cap screw that is located

underneath the plug. This secures the inner races

of the thrust bearings to the spindle.

F) Remove bolts that hold the thrust bearing 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 ﬁ 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.

Service

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 ﬁ 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-ﬂ 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 ﬁ 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 VSM 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)

VSS Models

GATE ROTOR THRUST BEARING INSTALLA-

TION

A) For installation of thrust bearings on VSS 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

VSS 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

VSM Models).

Inner Retainer

Ball Bearings

Retaining Ring

Service

VSM Models

GATE ROTOR ROLLER BEARING REMOVAL

A) Refer to section REMOVAL ( All VSS & VSM) 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 VSS & VSM 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 carbon face (219B)

and rotating mirror face (219C).

Service

Current Shaft Seal and for all Replacements.

(Roll Pin #265 only used on VSS 751 and

larger models.)

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

Seal Assembly

w/ Stationary Mirror Face

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 ﬁ 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 ﬂ ashlight, visually inspect the slide

valve carriage through the gas bypass opening.

Look for any signiﬁ 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.

Service

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.

457 477 415

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

ﬁ 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

Vent hole.

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 VSM 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 ﬂ 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

ﬂ 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 ﬂ 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.

Service

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

remaining cross shaft.

Service

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.

Torque Specifications (ft-lbs)

Type

Bolt

Head

Markings

Nominal Size Numbers or Inches

#10 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8

SAE Grade 2

Coarse (UNC) - 5 10 18 29 44 63 87 155 150*

SAE Grade 5

Coarse (UNC) - 8 16 28 44 68 98 135 240 387

SAE Grade 5

Coarse (UNC) --18-------

SAE Grade 8

Coarse (UNF) - 11 22 39 63 96 138 191 338 546

Socket Head

Cap Screw

(ASTM A574)

Coarse (UNC)

5 13 26 46 73 112 115 215 380 614

1) Torque values in this table are not to override other speciﬁ c torque speciﬁ cations when supplied.

2) When using loctite, torque values in this table are only accurate if bolts are tightened immediately after

loctite is applied.

* The proof strength of Grade 2 bolts is less for sizes 7/8 and above and therefore the torque values are less

than smaller sizes of the same grade.

Torque Specifications for 17-4 Stainless Steel Fasteners (ft-lbs)

Type

Bolt/Nut

Head

Markings

Nominal Size Numbers or Inches

#10 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4

Hex & Socket

Head Cap Screws 3 8 14 25 40 60 101 137 245

Nut -8-25-----

NOTE: Continue use of red loctite #271 (VPN 2205E) on currently applied locations. Use blue loctite #243

(VPN 2205F or 2205G) 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 speciﬁ 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 1301 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 Speciﬁ c Applications

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

These are found on the compressor’s Name Plate.

VSS Parts Section

Gate Rotor

111

120

135

119

130

141

131

125

110

126

142

143

118

121 122 123 124

Gate Rotor

MODEL NUMBER

VSS 451 VSS 601 VSS 751

ITEM DESCRIPTION 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 KT712A 2 KT712B 2 KT712C

GATE ROTOR BLADE REPLACEMENT KIT

(111, 118, 120A, 120B, 121, 122, 123, 124,

130, 141, 142, 143) 2 KT713A 2 KT713B 2 KT713C

102 GATE ROTOR SUPPORT ASSEMBLY

(100, 111, 120B, 119, 130) 2 A25161BB 2 A25161BA 2 A25161CB

105 GATE ROTOR GASKET SET

(118, 141, 142, 143) 2 A25164B 2 A25164B 2 A25164C

106 SHIM PACK SET

((2) 121, (2) 122, (1) 123, (1) 124) 2 A25165B 2 A25165B 2 A25165C

110 SUPPORT 2 25606A 2 25520A 2 25612A

111 GATE ROTOR 2 25557A 2 25534A 2 25608A

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 BEARING HOUSING

142 O-RING BALL BEARING HOUSING

143 O-RING BRG HSG COVER

150 HEX HEAD CAP SCREW

151 HEX HEAD CAP SCREW

152 HEX HEAD CAP SCREW

153 HEX HEAD CAP SCREW

160 SOCKET HEAD CAP SCREW

2 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

- N/A

2 25088A

2 25086A

2 25087A

2 25760B

AR 25089AA

AR 25089AB

AR 25089AC

AR 25089AD

2 2864C

4 2865A

2 2866B

2 2867E

2 2868F

2 25910B

2 2176N

2 2176V

2 2176U

- N/A

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

MODEL NUMBER

VSS 901 VSS 1051 VSS 1201 VSS 1301

ITEM DESCRIPTION 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 KT712D 2 KT712E 2 KT712F 2 KT712Y

GATE ROTOR BLADE

REPLACEMENT KIT

(111, 118, 120A, 120B,

121, 122, 123, 124, 130,

141, 142, 143) 2 KT713D 2 KT713E 2 KT713F 2 KT713Y

102 GATE ROTOR

SUPPORT ASSEMBLY

(100, 111, 120B, 119,

130) 2 A25161CA 2 A25161DB 2 A25161DA 2 A25161DH

105 GATE ROTOR

GASKET SET

(118, 141, 142, 143) 2 A25164C 2 A25164D 2 A25164D 2 A25164D

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

111 GATE ROTOR 2 25554A 2 25610A 2 25588A 2 25588F

118 GATE ROTOR

COVER GASKET 2 25088A 2 25132A 2 25132A 2 25132A

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

120A BUSHING, SMALL

DOWEL PIN 2 25087A 2 25104A 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 2864G 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 2867L 2 2867L 2 2867L

135A DOWEL PIN,

SMALL, 0.3125” O.D. 2 2868F 2 2868H 2 2868H 2 2868H

135B DOWEL PIN,

LARGE, 0.4375” O.D. 2 25910B 2 25910B 2 25910B 2 25910B

141 O-RING ROLLER

BEARING HOUSING 2 2176N 2 2176AJ 2 2176AJ 2 2176AJ

142 O-RING BALL

BEARING HOUSING 2 2176V 2 2176AM 2 2176AM 2 2176AM

143 O-RING BEARING

HOUSING COVER 2 2176U 2 2176U 2 2176U 2 2176U

Gate Rotor

MODEL NUMBER

VSS 1551 VSS 1851 VSS 2101

ITEM DESCRIPTION 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 KT712L 2 KT712M 2 KT712K

GATE ROTOR BLADE REPLACEMENT KIT

(111, 118, 120A, 120B, 121, 122, 123, 124,

130, 141, 142 & 143) 2 KT713G 2 KT713H 2 KT713L

101 GATE ROTOR ASSEMBLY

(111, 120) 2 A25160EB 2 A25160EA 2 A25160EA

102 GATE ROTOR SUPPORT ASSEMBLY

(100, 111, 120B, 119, 130) 2 A25161EB 2 A25161EA 2 A25161EL

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 26507A 2 26507A 2 26507A

113 LARGE BEARING HOUSING 2 26506A 2 26506A 2 26506A

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 26508A 2 26508A 2 26508A

118 GATE ROTOR COVER GASKET 2 26509A 2 26509A 2 26509A

119 WASHER 2 25788A 2 25788A 2 25788A

120A BUSHING, SMALL DOWEL PIN - N/A - N/A - N/A

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, SM, 0.250” O.D. - N/A - N/A - N/A

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

141 O-RING ROLLER BEARING HOUSING 2 2176U 2 2176U 2 2176U

142 O-RING BALL BEARING HOUSING 2 2176BD 2 2176BD 2 2176BD

143 O-RING BEARING HOUSING 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

Shaft Seal

230 260 219

Shaft Seal With Stationary Carbon Face

MODEL NUMBER

VSS 291 thru VSS 751 thru VSS 1301 VSS 1551 thru

VSS 601 VSS 1201 VSS 2101

ITEM DESCRIPTION QTY VPN QTY VPN QTY VPN QTY VPN

SHAFT SEAL AMM KIT

(219, 230, 260) 1 KT709A 1 KT709B 1 KT709MB 1 KT709C

SHAFT SEAL R22 KIT

(219, 230, 260) 1 KT781A 1 KT781B 1 KT709MA 1 KT781C

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

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

Main Rotor

207

201

MODEL NUMBER

VSS 451 VSS 601 VSS 751 VSS 901

ITEM DESCRIPTION QTY VPN QTY VPN QTY VPN QTY VPN

201 ROTOR ASSEMBLY 1 A25226BB 1 A25226BA 1 A25226CB 1 A25226CA

207 SHIM PACK 1 A25177B 1 A25177B 1 A25177C 1 A25177C

MODEL NUMBER

VSS 1051 VSS 1201 VSS 1301 VSS 1551

ITEM DESCRIPTION QTY VPN QTY VPN QTY VPN QTY VPN

201 ROTOR ASSEMBLY 1 A25226DB 1 A25226DA 1 A25752HA 1 A25226EC

207 SHIM PACK 1 A25177D 1 A25177D 1 A25177D 1 A25177E

MODEL NUMBER

VSS 1851 VSS 2101

ITEM DESCRIPTION QTY VPN QTY VPN

201 ROTOR ASSEMBLY 1 A25226ED 1 A25226EE

207 SHIM PACK 1 A25177E 1 A25177E

Slide Valve Cross Shafts and End Plate

297

286

226

298

222

268

269

297

228

226 227

VSS 291 THRU

VSS 601 ONLY

286

221

268 222

298

269

228

VSS 291 THRU VSS 601 ONLY

NO SPACER THIS SIDE OF

SHAFT ASSEMBLY

NOTE:

BOTH ACTUATOR SHAFT

ASSEMBLIES ARE IDENTICAL

ON VSS COMPRESSORS.

Slide Valve Cross Shafts and End Plate

MODEL NUMBER

VSS 291 thru VSS 751 VSS 1051 VSS 1551 thru

VSS 601 VSS 901 VSS 1201 VSS 2101

VSS 1301

ITEM DESCRIPTION QTY VPN QTY VPN QTY VPN QTY VPN

221 SHAFT 2 25843A 2 25844A 2 25845A 2 25793A

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

226 RACK CLAMP 2 25913A 4 25913C 4 25913C 4 25913C

227 RACK CLAMP 2 25913B - N/A - N/A - N/A

228 SPACER 2 25847A 4 25033C 4 25033C 4 25033C

267 DOWEL PIN - N/A 2 2868B 2 2868B 2 2868B

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

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

270 PIPE PLUG - N/A 2 2606E 2 2606E 2 2606A

286 SOCKET HEAD 8 2795F 8 2795F 8 2795F 8 2795F

CAP SCREW

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

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

305

300

345

316

347

378

380

350

360

361

363

323

304

343

Capacity SlideVolume Slide Carriage Assembly

Slide Valve Carriage Assembly

MODEL NUMBER

VSS 291 thru VSS 751 VSS 1051 VSS 1301

VSS 601 VSS 901 VSS 1201

ITEM DESCRIPTION QTY VPN QTY VPN QTY VPN QTY VPN

300 CARRIAGE ASSEMBLY 2 A25179B 2 A25179C 2 A25179D 2 A25179DSR

304 CAPACITY PISTON

(340, 341, 350, 355) 2 A25183B 2 A25183C 2 A25183D 2 A25183DN

305 VOLUME PISTON

(340, 342, 350, 355) 2 A25184B 2 A25184C 2 A25184D 2 A25184DN

307A GASKET SET

(345) 2 A25200B - N/A 2 A25200D 2 A25200D

307B GASKET SET

(345, 378) - N/A 2 A25200C - N/A - N/A

316 RACK 2 25024A 2 25080A 2 25080C 2 25779B

323 RACK 2 25023A 2 25080B 2 25080D 2 25080DH

325 SHAFT - N/A - N/A - N/A - N/A

340 PISTON - N/A 4 25076A 4 25138A 4 25138A

341 CAPACITY PISTON

SHAFT - N/A 2 25078A 2 25078E 2 25078G

342 VOLUME PISTON

SHAFT - N/A 2 25078B 2 25078F 2 25078H

343 COVER, ONE PIECE

CAST 2 25399A 2 25279A 2 25401A 2 25401A

345 GASKET, ONE PIECE

CAST COVER 2 25900A 2 25902A 2 25901A 2 25901A

346 GASKET, ONE PIECE

CAST COVER - N/A 2 25124A - N/A - N/A

347 PISTON SLEEVE - N/A 2 25079A - N/A - N/A

350 PISTON RING SET 4 2953AA 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

366 HEX HEAD CAP

SCREW 24 2796B 12 2796P 24 2796P 24 2796P

367 HEX HEAD CAP

SCREW - N/A 12 2796BN - N/A - N/A

373 SOCKET HEAD CAP

SCREW - N/A 6 2795N 6 2795P 6 2795P

374 LOCK WASHER

(PAIR) - N/A 6 3004C 6 3004D 6 3004C

378 O-RING - N/A 2 2176Y - N/A - N/A

380 RETAINER RING - N/A 2 2866C - N/A - N/A

100

Slide Valve Carriage Assembly

MODEL NUMBER

VSS 1551 thru

VSS 2101

ITEM DESCRIPTION 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

307A GASKET SET

(345) 2 A25200E

307B 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

343 COVER, ONE PIECE

CAST 2 25690A

345 GASKET, ONE PIECE

CAST COVER 2 25384A

346 GASKET, ONE PIECE

CAST COVER - N/A

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

366 HEX HEAD CAP

SCREW 28 2796BL

367 HEX HEAD CAP

SCREW - N/A

373 SOCKET HEAD CAP

SCREW 6 2795AG

374 LOCK WASHER

(PAIR) 6 3004D

378 O-RING 4 2176AG

380 RETAINER RING 4 2755AG

101

102

Actuator & Command Shaft

401

400 446

103

Actuator & Command Shaft

MODEL NUMBER

VSS 291 thru VSS 751 VSS 1051 VSS 1551 thru

VSS 601 VSS 901 VSS 1201 VSS 2101

VSS 1301

ITEM DESCRIPTION QTY VPN QTY VPN QTY VPN QTY VPN

400 COMMAND SHAFT

ASSEMBLY 2 A25994B 2 A25994C 2 A25994D 2 A25994E

401 SLIDE VALVE

ACTUATOR 2 25972D 2 25972D 2 25972D 2 25972D

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

104

VSS Screw Compressor

512

530

536

540

513

545

518

506

504

514

513

514

506

554

545

519

528

536

536536

536

547

504

528

545

514

513

545

514

504

514

545

Miscellaneous Frame Components

105

Miscellaneous Frame Components

MODEL NUMBER

VSS 291 thru VSS 751 VSS 1051 VSS 1301

VSS 601 VSS 901 VSS 1201

ITEM DESCRIPTION QTY VPN QTY VPN QTY VPN QTY VPN

- GASKET & O-RING KIT 1 KT710A 1 KT710B 1 KT710C 1 KT710J

504A FLANGE SET

(513A, 514A, 545A) 1 A25190A 1 A25190A 1 A25190B 1 A25190A

504B* FLANGE SET

(513B, 514B, 545B) 2 A25190B - N/A 2 A25190B 2 A25190B

504C* FLANGE SET

(513B, 514C, 545C) - N/A 2 A25190D - N/A - N/A

506A PLUG SET,

ECONOMIZER

(514C, 528, 545B) 1 A25243BE 1 A25243CC 1 A25243DC 1 A25243DD

506B PLUG SET,

ECONOMIZER

(514A, 514C, 528,

545C) - N/A - N/A - N/A - N/A

512 MANIFOLD GASKET 1 25503A 1 25541A 1 25324A 1 25324A

513A FLANGE 1 25058ASW 1 25058ASW 1 25058B 1 25058ASW

513B FLANGE 2 25058B 2 25058ASW 2 25058B 2 25058B

514A GASKET 1 11323D 1 11323D 1 11323E 1 11323D

514B GASKET 2 11323E - N/A 2 11323E 2 11323E

514C GASKET 2 11323D 2 11323S 2 11323E 2 11323E

518 GASKET, SUCTION 1 25199C 1 25199C 1 25199D 1 25199D

519 GASKET, DISCHARGE 1 25199B 1 25199B 1 25199C 1 25199C

528 ECONOMIZER PLUG 2 25397G 2 25395A 2 25391D 2 25391A

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

536 PIPE PLUG 3/4” MPT - N/A - N/A 6 2606A 6 2606A

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

542 PIPE PLUG 3/4” MPT - N/A - N/A - N/A - N/A

545A HEX HEAD CAP

SCREW 2 2796GP 2 2796GP 2 2796C 2 2796GP

545B HEX HEAD CAP

SCREW 4 2796C 4 2796C 4 2796C 4 2796C

545C HEX HEAD CAP

SCREW - N/A 4 2796GP - N/A - N/A

547 HEX HEAD CAP

SCREW 8 2796C 21 2796GP 24 2796GP 24 2796F

554 HEX HEAD CAP

SCREW 1 2796U 1 2796U 1 2796U 1 2796U

*Optional

106

Miscellaneous Frame Components

MODEL NUMBER

VSS 1551 thru

VSS 2101

ITEM DESCRIPTION QTY VPN QTY VPN QTY VPN QTY VPN

- GASKET & O-RING KIT 1 KT710D

504A FLANGE SET

(513A, 514A, 545A) 1 A25190C

504B* FLANGE SET

(513B, 514B, 545B) 2 A25190D

504C* FLANGE SET

(513B, 514C, 545C) - N/A

506A PLUG SET,

ECONOMIZER

(514C, 528, 545B) - N/A

506B PLUG SET,

ECONOMIZER

(514A, 514C, 528,

545C) 1 A25243ED

512 MANIFOLD GASKET 1 25676A

513A FLANGE 1 12477C

513B FLANGE 2 25058ASW

514A GASKET 1 11323F

514B GASKET 2 11323S

514C GASKET 2 11323G

518 GASKET, SUCTION 1 25199D

519 GASKET, DISCHARGE 1 25199C

528 ECON-O-MIZER PLUG 2 25393A

530 O-RING 2 2176J

536 PIPE PLUG 3/4” MPT 3 2606A

540 DOWEL PIN 2 2868K

542 PIPE PLUG 3/4” MPT 1 13163F

545A HEX HEAD CAP

SCREW 4 11397E

545B HEX HEAD CAP

SCREW 4 2796GP

545C HEX HEAD CAP

SCREW 12 11397E

547 HEX HEAD CAP

SCREW - N/A

554 HEX HEAD CAP

SCREW - N/A

*Optional

107

108

Replacement Tools

TO REMOVE BEARING

TO INSTALL BEARING

901

FOR VSS 451, VSS 601, DO NOT USE SIDE RAILS.

FOR VSS 751, VSS 901, VSS 1051 AND VSS 1201, ASSEMBLE SIDE RAILS AS STAMPED.

FOR VSS 1551 AND 1801, SIDE RAILS ASSEMBLE ONLY ONE WAY.

GATE ROTOR

SUPPORT

901

900

BALL BEARING

HOUSING

901

900

109

Replacement Tools

MODEL NUMBER

VSS 291 thru VSS 751 VSS 1051 VSS 1551 thru

VSS 601 VSS 901 VSS 1201 VSS 2101

VSS 1301

ITEM DESCRIPTION QTY VPN QTY VPN QTY VPN QTY VPN

900 GATE ROTOR TOOLS 1 A25205B 1 A25205C 1 A25205C 1 A25205E

901A GATE ROTOR

STABILIZER SET

(901A, 901B, 901C) 1 A25698A 1 A25698A 1 A25698A - N/A

901B GATE ROTOR

STABILIZER SET

(901A, 901B, 901C,

901D) - N/A - N/A - N/A 1 A25699A

110

111

VSM 301-701 Replacement Parts Section

Recommended

Spare Parts List

Refer to the Custom Manual

Spare Parts Section for Speciﬁ c Applications

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

These are found on the compressor’s Name Plate.

112

Gaterotor Assembly

113

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

114

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

115

MODEL NUMBER

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

QTY VPN QTY VPN

* SHAFT SEAL KIT (AMM)

219, 230, & 260. 1 KT709D 1 KT709A

* SHAFT SEAL KIT (HALO)

219, 230, & 260 1 KT781D 1 KT781A

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.

Shaft Seal

116

Main Rotor, Slide Valve Cross Shafts & End Plate

Models VSM 301-401 Counter Clockwise ONLY

117

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

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 25913D 4 25913D 4 25913D

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. (BAFFLE) 1 25939A 1 25939A 1 25939A

248 CHECK VALVE. (BAFFLE) 1 3120A 1 3120A 1 3120A

249 CHECK VALVE. (BAFFLE) 1 3120B 1 3120B 1 3120B

252 RETAINING RING. (BAFFLE) 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.

Main Rotor, Slide Valve Cross Shafts & End Plate

Models VSM 301-401 Counter Clockwise ONLY

118

Main Rotor, Slide Valve Cross Shafts & End Plate

Models VSM 501-701 Clockwise ONLY

119

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. (BAFFLE) 1 25929B 1 25929B 1 25929B

248 CHECK VALVE. (BAFFLE) 1 3120A 1 3120A 1 3120A

249 CHECK VALVE. (BAFFLE) 1 3120B 1 3120B 1 3120B

252 RETAINING RING. (BAFFLE) 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

120

Volume Ratio

Capacity Slide

Carriage Assembly

Slide Valve Carriage Assembly

Assembly Includes Carriage and Slides.

121

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.

122

Actuator & Command Shaft

123

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 O-RING SEAL 2 2176X 2176X 2176X 2176X

Actuator & Command Shaft

124

Model VSM 501-701

Miscellaneous Frame Components

Model VSM 301-401

125

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

* GASKET / O-RING SET 1 KT1075A 1 KT1075B

Notes. * Not Pictured.

Miscellaneous Frame Components

126

Housing Accessories

Miscellaneous Frame Components

127

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

128

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

129

ICM/ICAD Motorized Valve Setup Instructions

The following items need to be setup in order for the valve to operate properly.

1. Press the “Circle” button on the valve. A value of “01” should be shown on the screen.

2. Press the “Circle” button. There should be a value of “1” shown. If not use the up/down

arrows to change it to the correct value. Press the “Circle” button when done.

3. Press the “Up” arrow button. A value of”02” should be shown on the screen.

4. Press the “Circle” button. There should be a value of “1” shown. If not use the up/down

arrow buttons to change it to the correct value. Press the “Circle” button when done.

5. Press the “Up” arrow button. A value of “03” should be shown on the screen.

6. Press the “Circle” button. There should be a value of “2” shown. If not, use the up/down

arrow buttons to change it to the correct value. Press the “Circle” button when done.

7. Press the “Up” arrow button until a value of “04” is shown on the screen.

8. Press the “Circle” button. There should be a value of “50” shown. If not, use the up/down

arrow buttons to change it to the correct value. Press the “Circle” button when done.

9. Press the “Up” arrow button until a value of “07” is shown on the screen.

10. Press the “Circle” button. There should be a value of “1” shown. If not, use the up/down

arrow buttons to change it to the correct value. Press the “Circle” button when done.

11. Press the “Up” arrow button until a value of “10” is shown on the screen.

12. Press the “Circle” button. Press the up/down arrow button to change the value to “11”.

Press the “Circle” button.

Danfoss Liquid Injection Valve Setup

130

13. Press the “Up” arrow button until a value of “26” is shown on the screen.

14. Press the “Circle” button. Press the up/down arrow buttons to change the value to the

correct valve that is on the unit. The value number is listed on the valve. The values and

valves are as follows:

0: No valve selected. Alarm A1 will become active.

1: ICM20 with ICAD 600

2: ICM25 with ICAD 600

3: ICM32 with ICAD 600

4: ICM40 with ICAD 900

5: ICM50 with ICAD 900

6: ICM65 with ICAD 900

15. Press the “Circle” button.

The valve is now ready to be used.

Note:

Refer to the appropriate controller manual for control setup.

ICM/ICAD Motorized Valve Installation, Programming, and Troubleshooting

2 DKRCI.EI.HT0.A1.22 / 520H1639  ¢ Danfoss (USCO / MKS), 11- 2006

Contents Page

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Wiring the ICAD ..........................................................................................5

ICAD Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

ICAD Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Troubleshooting

The Manual Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Service parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Alarms ............................................................................................. 11

Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Common questions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

ICM/ICAD Motorized Valve Installation, Programming, and Troubleshooting

4 DKRCI.EI.HT0.A1.22 / 520H1639  ¢ Danfoss (USCO / MKS), 11- 2006

Care should be taken to protect the ICM function module while it is removed from the

valve body.

3. Weld the valve body in line making sure the arrow on the valve body is pointing in

the direction of ow.

4. Remove all debris from the valve body before re-installing the bonnet.

5. Install the bonnet/function module into the valve body.

a. For ICM 20, make sure that the removable orice seat is installed in the valve body

with the small O-ring between the orice seat and body. Make sure the bonnet gasket

is installed and in good condition.

b. For ICM 25 through ICM 65, check that the two O-rings on the bonnet and gasket

located between the bonnet and valve body are installed and in good condition. A

light coating of refrigerant oil on the bonnet O-rings will facilitate installation of the

bonnet.

6. Install the four bolts and torque to the following specications:

Valve body Nm ft lbs

ICM 20 50 37

ICM 25 80 59

ICM 32 80 59

ICM 40 90 66

ICM 50 100 74

ICM 65 110 81

7. Install the ICAD motor actuator on the ICM valve:

a. The ICM valve must not be in its fully opened position while the ICAD motor is

calibrated with the valve at a later step. Therefore, if the opening degree of the ICM

valve was changed from the factory setting, it should be set to an opening degree

between 0% and 75% using the manual magnet tool. To easily ensure correct

positioning, turn the manual tool counter-clockwise until it is clear that it cannot be

turned further.

b. Make sure that the ICM adapter/valve stem and inner ICAD motor magnets are

completely dry and free from any debris.

c. For applications below freezing, the ICM adapter O-ring (position 2c in the diagram

on page 3) must be removed, and Molycote G 4500 grease (supplied with ICAD

motor) needs to be applied in the O-ring groove on the adapter and on the O-ring

before it is re-installed on the ICM adapter. The Molycote grease ensures a good seal

between the ICAD motor and the ICM adapter to prevent moisture from entering the

ICAD magnets.

d. Place the ICAD motor on the valve stem.

e. Push the ICAD motor completely down to the identication ring on the valve stem

and use a 2.5 mm hex key to tighten the set screws evenly so the ICAD motor is

centered on the ICM adapter (torque: 3 Nm/ 2.5 lb-ft).

ICM/ICAD Motorized Valve Installation, Programming, and Troubleshooting

¢ Danfoss (USCO / MKS), 11 - 2006 DKRCI.EI.HT0.A1.22 / 520H1639 5

Wiring the ICAD Note: The ICAD is powered by a 24 Volt DC power source.

There are two cables pre-mounted and connected to the ICAD motor actuator. Never try to

open the ICAD motor because the special moisture seal will be damaged.

The power cable consists of 3 wires:

Green: (–) common (ground)

Brown: (+) positive from 24VDC power source

White: (+) positive from UPS/battery backup (optional)

The control cable consists of 7 wires:

Yellow: (–) common (ground)

Gray: (+) positive 4-20mA or 0-20mA input to control ICAD motor

Blue: (+) positive 4-20mA or 0-20mA output from ICAD for valve

position feedback

Pink: (+) positive 2-10V or 0-10V input to control ICAD motor. Also used as a

digital input with the yellow wire for on/o solenoid valve operation.

White: common alarm (digital NPN transistor output when combined with

yellow wire)

Brown: indicates ICM is fully open (digital NPN transistor output when combined

with yellow wire)

Green: indicates ICM is fully closed (digital NPN transistor output when combined

with yellow wire)

Supply voltage is galvanically isolated from input and output wires.

Supply voltage

24 V d.c., +10% / -15%

Load ICAD 600: 1.2 A

ICAD 900: 2.0 A

Fail safe supply

Min. 19 V d.c.

Load ICAD 600: 1.2 A

ICAD 900: 2.0 A

Anolog input - Current or Voltage

Current

0/4 - 20 mA

Load: 200 Ω

Voltage

0/2 - 10 V d.c.

Load: 10 kΩ

Analog output

0/4 - 20 mA

Load: ≤ 250 Ω

Digital input - Digital ON/OFF input by means of voltfree contact (Signal/Telecom relays with

gold-plated contacts recommended) – Voltage input used

ON: contact impedance < 50 Ω)

OFF: contact impedance > 100 kΩ

Digital output - 3 pcs. NPN transistor output

External supply: 5 - 24 V d.c. (same supply as for ICAD can be used, but please note that the

galvanically isolated system will then be spoiled).

Output load: 50 Ω

Load: Max. 50 mA

•

Electrical Data

ICM/ICAD Motorized Valve Installation, Programming, and Troubleshooting

¢ Danfoss (USCO / MKS), 11 - 2006 DKRCI.EI.HT0.A1.22 / 520H1639 9

ICAD Parameters

Description Display

name Min. Max. Factory

setting Unit Comments

ICM OD (Opening

Degree) - 0 100 - % ICM valve Opening Degree is displayed during normal operation.

Running display value (see ¡01, ¡05).

Main Switch ¡01 1 2 1 -

Internal main switch

1: Normal operation

2: Manual operation. Valve Opening Degree will be ashing. With the down arrow

and the up arrow push buttons the OD can be entered manually.

Mode ¡02 1 2 1 -

Operation mode

1: Modulating – ICM positioning according to Analog Input (see ¡03)

2: ON/OFF - operating the ICM valve like an ON/OFF solenoid valve controlled via

Digital Input. See also ¡09.

Analog Input signal ¡03 1 4 2 -

Type of Analog Input signal from external controller

1: 0 - 20 mA

2: 4 - 20 mA

3: 0 - 10 V

4: 2 - 10 V

Speed at ON/OFF and

Modulating Mode ¡04 1 100 100 %

Speed can be decreased. Max. speed is 100 %

Not active when ¡01 = 2

If ¡02 = 2 the display will indicate speed in display. Low, Med and High also

means ON/OFF operation.

If ¡04 < = 33, Low is displayed

33 < If ¡04 < = 66, Med is displayed

If ¡04 > = 67 High is displayed

Automatic calibration ¡05 0 1 0 -

Not active before ¡26 has been operated.

Always auto reset to 0.

CA” will ash in the display during calibration, if Enter push button has been

activated for two seconds.

Analog Output signal ¡06 0 2 2 -

Type of A0 signal for ICM valve position

0: No signal

1: 0 - 20 mA

2: 4 - 20 mA

Fail safe ¡07 1 4 1 -

Dene condition at power cut when fail safe is installed.

1: Close valve

2: Open valve

3: Maintain valve position

4: Go to OD given by ¡12

Digital Input function ¡09 121

Dene function when DI is ON (short circuited DI terminals) when ¡02 = 2

1: Open ICM valve (DI = OFF = > Close ICM valve)

2: Close ICM valve (DI = OFF = > Open ICM valve)

Password ¡10 0 199 0 - Enter number to access password protected parameters: ¡26

Password = 11

Old Alarms ¡11 A1 A99 - - Old alarms will be listed with the latest shown rst. Alarm list can be reset by

means of activating down arrow and up arrow at the same time for 2 seconds.

OD at powercut ¡12 0 100 50 - Only active if ¡07 = 4

If fail safe supply is connected and powercut occurs ICM will go to entered OD.

ICM conguration ¡26 060

NB: Password protected. Password = 11

At rst start up A1 will ash in display. Enter valve type

0: No valve selected. Alarm A1 will become active.

1: ICM20 with ICAD 600

2: ICM25 with ICAD 600

3: ICM32 with ICAD 600

4: ICM40 with ICAD 900

5: ICM50 with ICAD 900

6: ICM65 with ICAD 900

Programming the ICAD When the ICAD motor is rst powered, the ICAD display will ash an A1 alarm. This means

that the ICM valve size that is being used with the ICAD motor needs to be selected in

parameter ¡26. Parameter ¡26 is password protected and will not appear in the parameter list

until the user enters the password in parameter ¡10. The password is “11,” and will allow the

user to access parameter ¡26 where the appropriate valve size is selected. When the ICM

valve size is selected, the ICAD will calibrate itself to the ICM valve and will then be ready for

control by a 4-20mA signal. For most applications, this is the only programming that will

need to be done if the ICAD is going to be controlled by a 4-20mA input.

ICM/ICAD Motorized Valve Installation, Programming, and Troubleshooting

10 DKRCI.EI.HT0.A1.22 / 520H1639  ¢ Danfoss (USCO / MKS), 11- 2006

Troubleshooting

The Manual Tool

The manual tool should always be ordered with any ICM/ICAD assembly. This tool gives the

user the ability to remove the ICAD actuator and manually rotate the valve in the open or

close direction depending on need and application. When using the manual tool, a clock-

wise rotation will open the valve and a counter-clockwise rotation will close the valve.

NOTE:

It is very important to remember that when rotating the valve manually you are changing

the position from that in the actuator’s memory. If power is removed from the actuator prior

to using the manual tool, no problem will occur because, once the ICAD is powered up again,

it will automatically recalibrate to the fully closed position before returning to the position in

memory to which the control signal last set the valve. This recalibration will not occur if

power is not removed from the ICAD prior to using the manual tool, and erroneous operation

will likely occur. Always remove power before using the manual tool, and restore power

afterward to ensure recalibration and trouble-free operation.

The user will be able to troubleshoot and determine many of the conditions and set points

within the ICAD by accessing the Service Menu. A list of those service parameters follows

below:

It is also possible to restore the original factory settings to the ICAD by the following

procedure:

To restore factory settings:

1. Remove the power supply.

2. Activate down arrow and up arrow push buttons at the same time.

3. While holding the up and down arrow reconnect the power supply.

4. Release down arrow and up arrow push buttons.

5. When the display on ICAD is alternating between showing: CA and A1 the factory

resetting is complete.

Service Menu

Description Display

name Min. Max. Unit Comments

OD % ¡50 0 100 % ICM valve Opening Degree

AI [mA] ¡51 0 20 mA Analog Input signal

AI [V] ¡52 0 10 V Analog Input signal

AO [mA] ¡53 0 20 mA Analog Output signal

DI ¡54 0 1 - Digital Input signal

DO Close ¡55 0 1 - Digital Output Closed status. ON when OD < 3 %

DO Open ¡56 0 1 - Digital Output Open status. ON when OD > 97 %

DO Alarm ¡57 0 1 - Digital Output alarm status. ON when an alarm is detected

MAS mP SW

ver. ¡58 0 100 - Software version for MASTER Microprocessor

SLA mP SW ver. ¡59 0 100 - Software version for SLAVE Microprocessor

Service Parameters

ICM/ICAD Motorized Valve Installation, Programming, and Troubleshooting

¢ Danfoss (USCO / MKS), 11 - 2006 DKRCI.EI.HT0.A1.22 / 520H1639 11

Alarms There are a number of alarms which are excellent indicators of improper installation or

set-up:

Description ICM

alarm text Comments

No valve type selected A1 At start-up

A1 and CA will be displayed

Controller fault A2 Internal fault inside electronics

Input error A3

Not applicable if ¡01 = 2 or ¡02 = 2

When ¡03 = 1 and AI > 22 mA

When ¡03 = 2 and AI > 22 mA or AI < 2 mA

When ¡03 = 3 and AI >12 V

When ¡03 = 4 and AI >12 V or AI < 1 V

Low voltage of fail safe supply A4 If 5 V d.c. < Fail safe supply

< 18 V d.c.

Check Supply to ICAD A5 If supply voltage < 18 V d.c.

Problem Possible cause and solution

The valve is not working and an A1 is

ashing in the display.

The ICM valve size was not selected in

parameter ¡26. See the programming

section on page 9.

The valve does not appear to be opening

or closing properly

The ICAD was not mounted properly

on the valve stem. Solution: Check to

make sure that the ICAD was mounted

evenly on the ICM valve

The ICAD is not receiving a proper

input signal. Solution: Use the service

parameters (¡51 for a mA input or ¡52

for a voltage input) to check the input

signal that the ICAD is receiving.

The valve position feedback signal is not

working when using customer supplied

controller/PLC

A power supply was installed in the

4-20mA/0-20mA feedback loop.

The ICAD motor actuator supplies

the power for the 4-20mA/0-20mA

feedback loop. Solution: Remove any

power source that may be supplied to

the feedback loop.

Wiring problem. Solution: Check the

service parameter ¡53 to see what the

ICAD is outputting. If this does not

reveal anything, check the current

output (yellow and blue wires in ICAD

control cable) with an ammeter.

The feedback output signal was turned

o in parameter ¡06. Solution: Check

to make sure the setting in parameter

¡06 is correct.

For all other problems, contact Danfoss.

Troubleshooting Tips

ICM/ICAD Motorized Valve Installation, Programming, and Troubleshooting

12 DKRCI.EI.HT0.A1.22 / 520H1639  ¢ Danfoss (USCO / MKS), 11- 2006

Danfoss · Refrigeration & Air-Conditioning Division · 7941 Corporate Drive · Baltimore, MD 21236

Ph 410-931-8250 · Fax 410-931-8256 · E-mail: baltimore@danfoss.com · Internet: www.danfoss.com/North_America

Common Questions What happens in the event of a power failure?

The ICAD will remain in the position it is in when power is lost. There are two ways to

address this condition:

Add a UPS (Uninterruptible Power Supply) to the power wiring. This is easily

accomplished with the green and white wires in the power cable. A UPS is

available from Danfoss. The UPS can provide service for up to 9 ICAD 600’s or up

to 6 ICAD 900’s.

Note: The UPS is not a continuous power supply. It is used to change the valve

position (usually to close the valve) in the event of a power failure. Therefore, the

system is not to be run in the UPS mode.

Add a solenoid valve in front of the ICM. This is a very simple solution provided

that there is no issue associated with the additional pressure drop through the

solenoid valve.

How much power do I need to supply to the ICAD?

The total power required depends on both the ICAD size and the number of ICAD’s powered

by the DC power supply. The power for each ICAD is:

For the ICAD 600 (used on ICM 20, 25, and 32), the power requirement is

approximately 30 W

For the ICAD 900 (used on ICM 40, 50, and 65), the power requirement is

approximately 50 W

How can I monitor the valve position remotely?

The control wiring provides for a 4 to 20 mA or 0 to 20 mA signal output (blue and yellow

wires). This signal can be sent to:

A remote display

A PLC or PC

Another ICAD motor to give the same opening position

•

143

Appendix A: Pre Start Up for Remote Oil Coolers

Emerson Vsm Users Manual 35391S Rev 08b Booklet.indb

Emerson Air Compressor 450XL 35391S_Rev_08b

0020ab6d-0f13-4264-953b-fba9d83b13ec Emerson Air Compressor VSR User Guide |

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