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
3
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: _________________
Vilter Order Number: _______________________Compressor Serial Number: _________________
Vilter Order Number: _______________________Compressor Serial Number: _________________
Vilter Order Number: _______________________Compressor Serial Number: _________________
Important Message
4
5
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
6
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.
7
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
8
The procedure described is a general recommendation for long term storage (over one month of no operation)
of Vilter Manufacturing packages and compressors. While this procedure is intended to cover most of the
commonly encountered situations, it is the responsibility of the installation rm and end user to address any
unusual conditions. We suggest using the accompanying Long Term Storage Log sheet for recording purposes
to validate the appropriate procedures.
Prior to start-up, Vilter recommends that a complete system pressure check be performed. Upon veri cation
of the system integrity, a comprehensive evacuation procedure should be completed to ensure a dry system
before gas is introduced. The oil circuit of any compressor is to be primed at initial start-up through the pre-
lube oil pump on screw compressors.
Warranty of the system remains in effect as described in Section 5, Product Warranty and Procedures.
* If the unit is designed for indoor duty, it must be stored in a heated building.
If the unit is designed for outdoor duty, and is to be stored outdoors, a canvas tarp is recommended for
protection until installation is imminent. Adequate drainage should be provided, by placing wood blocks
under the base skid, so that water does not collect inside the base perimeter or low spots in the tarp.
* All compressor stop valves are to be closed to isolate the compressor from the remainder of the system. All
other valves, except those venting to atmosphere, are to be open. It is essential that the nitrogen holding
charge integrity be maintained.
* Cover all bare metal surfaces (coupling, ange faces, etc.) with rust inhibitor.
* Desiccant is to be installed in the control panel. If the panel is equipped with a space heater, it is to be
energized. If the panel does not have a space heater, use a thermostatically controlled 50-watt light bulb.
Use an approved electrical spray-on corrosion inhibitor for panel components (relays, switches, etc.)
* All pneumatic controllers and valves (Fisher, Taylor, etc.) are to be covered with plastic bags and sealed with
desiccant bags inside.
* System and compressor pressures (unit is shipped with dry nitrogen holding charge approximately 5 psi
above atmospheric pressure) are to be monitored, on a regular basis, for leakage. It will be necessary to
add a gauge to monitor the system holding charge pressure. If a drop in pressure occurs, the source of
leakage must be found and corrected. The system must be evacuated and recharged with dry nitrogen to
maintain the package integrity.
* Motors – (NOTE: The following are general recommendations. Consult the manufacturer of your motor
for speci c recommendations.)
1) Remove the condensation drain plugs from those units equipped with them and insert silica-gel into the
openings. Insert one-half pound bags of silica-gel (or other desiccant material) into the air inlets and outlets
of drip-proof type motors.
NOTE: The bags must remain visible, and tagged, so they will be noticed and removed when
the unit is prepared for service.
Long Term Storage Requirements
9
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 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.
10
COMPRESSOR
The Vilter Single Screw Compressor is a positive displacement, capacity and volume controlled, oil ooded,
rotary compressor which uses a single main screw intermeshed by two opposing gate rotors. Gas compression
occurs when the individual ngers of each gate rotor sweep through the grooves, or utes, of the main screw as
the screw rotates. Compression occurs from the time the screw ute is rst closed off by the gate rotor nger,
until the time when the screw ute has rotated to the point of lining up with the discharge port in the compres-
sor housing. A labyrinth type seal is used to prevent gas at discharge pressure from leaking past the end of the
screw. Any discharge gas leakage past the labyrinth seal is vented back to suction via four longitudinal holes
drilled through the body of the screw.
By venting the discharge end of the main screw back to suction, forces on each end of the screw are equal. This
results in zero net axial forces on the main bearings. With twin opposing gate rotors, all radial forces are can-
celled out also. Main shaft bearings have no net forces except the weight of the screw and the shaft assembly.
The compressors are comprised of three rotating assemblies: the main screw assembly and the two gate ro-
tor assemblies. Each of these rotating assemblies use a common bearing con guration consisting of a single,
cylindrical rolling element bearing at one end, and a pair of angular contact ball bearings at the other end. The
pair of angular contact ball bearings are used to axially x one end of the rotating shafts, and to absorb the small
amount of thrust loads on the shafts. The inner races of the ball bearings are securely clamped to the rotating
shafts, while the outer races are securely held in the bearing housing, thus xing the axial position of the shaft
in relation to the bearing housings. The cylindrical roller bearings at the opposite end of the shafts allow for
axial growth of the shafts while supporting the radial loads from the shafts.
The suction gas enters the compressor housing through the top inlet ange, at the driven end of the unit. The
driven end of the compressor housing is ooded with gas at suction pressure. The gas enters the open end of
the main screw utes at the driven end, and becomes trapped in the screw ute as the screw rotates and the
gate rotor tooth enters the end of the ute. At this point, the compression process begins. Directly after the
screw ute is closed off by the gate rotor tooth, oil is injected into the groove.
The oil enters the compressor through a connection at the top of the compressor. The purpose of the injected oil
is to absorb the heat of compression, to seal the gate rotor tooth in the groove, and to lubricate the moving parts.
Additional internal oiling ports are provided at the main and gate rotor bearings to cool and lubricate the bear-
ings. The mechanical shaft seal housing also contains oiling ports to lubricate, cool and provide a sealing lm
of oil for the mechanical shafts seal. Excess oil ows through the check valves on the sealing baf e plate. This
oil is directed at the main rotor roller bearing, which cools and lubricates the front roller bearing.
As the main screw rotates, the gate rotor is also driven, causing the gate rotor tooth to sweep the groove in the
main screw. This sweeping action reduces the volume of the groove ahead of the gate rotor tooth and causes
the trapped gas and oil to be compressed in the reduced volume. As the main screw continues to rotate, the
gate rotor tooth continues to reduce the groove volume to a minimum, thus compressing the trapped gas to
a maximum pressure. A labyrinth seal arrangement prevents the compressed gas from leaking past the end of
the screw. As the gate rotor tooth reaches the end of the groove, the groove rotates to a position that lines up
with the discharge port in the compressor housing and the gas/oil mixture is discharged from the screw at high
pressure. This completes the compression cycle for a single ute of the main screw.
Once the gas is swept from the main screw ute through the discharge port, it passes into the discharge manifold
of the compressor. From the discharge manifold, the gas/oil exits the compressor housing
Description
11
The Vilter compressors feature the exclusive Parallex™ Slide System, which consists of a pair of slides for each
gate rotor assembly. These two independently operated slides are referred to as the capacity slide and the vol-
ume ratio slide. On the suction end of the screw, the capacity slide moves to vary the timing of the beginning
of the compression process. With the slide moved all the way out to the suction end of the screw (the 100%
position), the compression process begins immediately after the gate rotor tooth enters the screw ute and
closes off the end of the groove. In this situation, the maximum volume of gas is trapped in the screw ute at
the start of the compression process. As the slide is pulled back away from the suction end of the screw, the
start of the compression process is delayed as some of the suction gas is allowed to spill back out of the screw
ute until the screw rotates far enough to pass the end of the capacity slide and begin compressing. This causes
a reduced volume of gas to be trapped in the screw ute when the compression process begins. In this way, the
capacity of the compressor is reduced from 100% down to as low as 10% of the full rated capacity.
The capacity slide provides the means for controlling speci c process set points. By continuously adjusting the
ow of gas through the compressor, either suction or discharge pressure in a particular process can be controlled.
When coupled with a microprocessor controller, the adjustable capacity slide allows for precise and continuous
automatic control of any parameter in the process to a chosen set point.
The second slide for each gate rotor is the volume ratio slide. The purpose of the volume ratio slide is to maximize
the ef ciency of the compressor by matching the gas pressure within the screw ute at the point of discharge
to the downstream process requirements. The volume ratio slide operates at the discharge end of the screw,
and acts to vary the position of the discharge port. When the slide is extended fully to the discharge end of the
screw (the 100% position), the compression process within the screw ute continues until the screw rotates
far enough for the ute to pass the end of the volume ratio slide. At this point, the screw ute lines up with the
discharge port and the compressed gas is expelled from the screw ute. As the volume ratio slide is pulled back
away from the discharge end of the screw, the position of the discharge port is changed and the gas is allowed
to escape the screw ute earlier in the compression process, at a reduced pressure.
The overall volume ratio within the compressor is determined by the distance between the front of the capac-
ity slide (the start of compression) and the back of the volume ratio slide (the completion of compression).
Therefore, the volume ratio slide must respond to changes in the downstream pressure measured in the oil
separator and position itself for the required compression ratio based on the position of the capacity slide. By
only compressing the gas within the screw as far as required to match the pressure in the downstream receiver,
the compressor ef ciency is maximized. Proper positioning of the volume ratio slide prevents either over
compressing or under compressing of the gas within the screw ute. This allows the single screw compressor
to ef ciently handle a range of volume ratios from as low as 1.2 up to 7.0.
Description
12
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 speci 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 Master 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 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.
13
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 speci 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
oor, typically indoors, the 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"
6"
COMPRESSOR UNIT
2" (TYP.)
2" (TYP.)
G.A.
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
14
CENTER LINE OF
GAS COMPRESSION
SYSTEM
6"
# 6 @ 12"
EACH WAY
TOP & BOTTOM
COMPRESSOR UNIT
G.A.
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
15
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 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
16
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.
G.A.
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
17
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 suf 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, 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
18
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 suf cient depth to dampen vibrations.
Foundation
19
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.
20
Rigging and Lifting
Training curriculum for Participants, at a minimum, should include:
A review of safe operating practices;
A review of who each person is and their speci c role in the lift;
A tutorial on how to read lift charts;
A demonstration on how to use and inspect rigging hardware;
A review of the company’s general lift plans and procedures;
A tutorial on hand signals normally used to communicate with crane operators (a copy of such hand signals
may be obtained from machine safety vendors); and
A review of the Compressor’s speci c rig and lift plan (the “Plan”) (developed by the Lift Coordinator and Lift
Engineer); please see the section immediately below entitled “Create and Communicate the Plan.
Individuals participating in the lift should fully understand the scienti c principles pursuant to which a successful
lift is dependent—for example, center of gravity, equilibrium, and mechanics of load stabilization, critical angle
considerations and force.
All Participants should undergo a tness-for-duty program, including drug testing and medical examinations.
Create and Communicate the Plan
Well in advance of the planned lift date, lift planning meetings and hazard assessment meetings should be held
with all Participants in attendance. In addition, the Plan should be nalized and distributed for review and com-
ment.
The Plan should clearly de ne requirements, expectations and speci cations for lifting the Compressor. At a mini-
mum, the Plan should include:
Standard lifting and rigging procedures in place at the lift site (including proper classi cation of the lift as a
“critical lift” a “serious lift” or a “standard lift”);
Drawings of the Compressor;
A description of the lifting task;
An evaluation of the hazards;
The rigging plan and sketches of rigging to be attached to the Compressor;
The roles and responsibilities of all Participants;
An emergency plan; and
The contact information of the Plan preparer
It is important to con rm that each Participant understands both the broader Plan and their speci c responsibilities
during the lift. Participants should be encouraged to contact the Plan preparer at any time if they have questions.
In addition, the Plan preparer should be on-site during the lift to ensure that the lift is being executed in accor-
dance with the Plan. Finally, well in advance of the lift date, it should be con rmed that all necessary permits have
been obtained.
Inspect and Use the Appropriate Lifting Equipment
Verify Crane Operator and Crane Owner Credentials
Prior to rigging and lifting the Compressor, certain precautions should be taken with regards to the crane, the
crane operator and the crane owner.
The lift capacity of the crane must exceed the Compressor’s weight;
• Con rm that the crane operator is quali ed to work on the site;
21
Get third-party con rmation that the crane owner and the crane operator are in compliance with applicable
laws, regulations and internal safety standards;
Consult with the crane owner to determine if any site preparation is required for outriggers—improper use of
outriggers is a signi cant cause of crane failure;
Determine the level of supervision to be supplied by the crane owner; and
Review all crane maintenance and inspection records, including without limitation, the crane log book, main-
tenance records, inspection reports and the physical condition of the crane.
Take all Appropriate Measurements
Understand and interpret the load charts;
Review all Compressor drawings for unit size, weight, center of gravity and other speci cations;
Communicate incident response procedures in writing prior to the lift and verbally immediately before the lift;
Determine the initial position, nal position, orientation and elevation of the Compressor;
Ensure that adequate space is provided to safely assemble, erect, and operate the crane and materials (such as
timber mats, cribbing and blocks);
Identify and communicate to all Participants the access points, lift radius, swing radius, clearances, and ob-
structions;
Eliminate hazards and obstructions that may interfere with moving the Compressor; and
Inform all Participants of water lines, sewer lines, power lines and other obstructions.
Use Proper Rigging Methods
Determine diameter, length and quantity of necessary rigging hardware (design and detail the rigging hard-
ware to suit lifting the Compressor at the supplied pad eyes);
Review and inspect all hoisting, lifting and rigging equipment;
Select shackle size and prepare sketches or drawings for rigging;
Use proper, conservative rigging techniques—including spreader beams—needed to lift the Compressor;
Pad sharp corners, check the orientation of chocker hitches and the orientation of hooks;
Prevent the binding of hoist rings; and
Verify pad eye information.
TEST AND BALANCE THE COMPRESSOR
It is essential to test and balance the compressor before executing the actual lift in order to identify potential
causes of injury to Participants and the Compressor.
Secure Rigging and the Lift Site
Reiterate that no one should walk under the raised load;
Secure and restrict access to the lift area (consider vacating all non-essential personnel from the area);
• Provide quali ed supervision for the duration of the lift;
If applicable, assess the weather conditions and decide if it is safe to proceed;
Stop the lift when any potentially unsafe conditions are recognized; and
Ensure there are open channels for communications during the pre-lift, lift and post-lift phases (radio commu-
nications should be used if a direct line of sight is not possible).
Test and Balance the Compressor before the Lift
Slowly raise the crane to take slack out of the rigging without actually lifting the load;
Allow the rigging gear to settle into place;
Check for twists and binds;
Verify that all padding has remained in place and that all slings are protected from sharp edges;
Begin to raise the load to verify balance and check the braking system; and
If the Compressor is not balanced, lower and adjust as necessary.
Rigging and Lifting
22
Rigging and Lifting
CONTACT VILTER
While Vilter will not offer any speci c feedback on the Plan or provide a speci c Plan for rigging and lifting the
Compressor, Vilter may be able to answer questions about the Compressor that are important in developing your
Plan.
Please contact Vilter at:
P.O. Box 8904
5555 S Packard Ave
Cudahy, WI 53110-8904
Telephone: 1-414-744-0111
Fax: 1-414-744-3483
email: info.vilter@emerson.com
www.vilter.com
23
Installation
I. DELIVERY INSPECTION
Vilter screw compressor components are thor-
oughly inspected at the factory, assuring the
shipment of a mechanically perfect piece of equip-
ment. Damage can occur in shipment, however.
For this reason, the units should be thoroughly
inspected upon arrival. Any damage noted should
be reported immediately to the transportation
company. This way, an authorized agent can ex-
amine the unit, determine the extent of damage
and take necessary steps to rectify the claim with
no serious or costly delays. At the same time,
the local Vilter representative or the home of ce
should be noti ed of any claim made.
TABLE 1. UNIT WEIGHTS (LBS)*
MODEL STANDARD ECON-O-
MIZER
VSM 71 2,750 2,750
VSM 91 2,750 2,750
VSM 101 2,750 2,750
VSM 151 2,750 2,750
VSM 181 2,750 2,750
VSM 201 2,750 2,750
VSM 301 2,850 2,850
VSM 361 2,850 2,850
VSM 401 2,850 2,850
VSM 501 4,000 4,000
VSM 601 4,500 4,500
VSM 701 5,000 5,000
VSS 451 4,000 4,000
VSS 601 4,500 4,500
VSS 751 5,300 5,300
VSS 901 5,300 5,300
VSS 1051 6,600 6,600
VSS 1201 6,700 6,700
VSS 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 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 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.
24
Installation
Care must be taken to avoid trapping the lines ex-
cept for speci 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 ttings.
Common pipe ttings must NEVER be used as
they will not provide the same service. Steel pipe
is generally used in large installations when joints
are welded.
In making up joints for steel pipe, the following
procedures should be followed:
For threaded connections, all threads on the pipe
and tting should be carefully cleaned to remove
all traces of grease or oil. Threads should then be
wiped dry with a lintless cloth. Only thread ll-
ing compounds suitable for refrigeration service
should be used for making steel pipe joints. These
compounds should be used sparingly, and on the
pipe only. Do not put any on the rst two threads
to prevent any of the compound from entering
the piping system. Acetylene or arc welding
is frequently used in making steel pipe joints,
however, only a skilled welder should attempt this
kind of work. Take care to see no foreign materials
are left in the pipes and remove all burrs formed
when cutting pipe.
It is important to avoid short, rigid pipe lines that
do not allow any degree of exibility. This must
be done to prevent vibration being transmitted
through the pipe lines to the buildings. One
method of providing the needed exibility to
absorb the vibration is to provide long lines that
are broken by 90° Ells in three directions.
Smaller Halocarbon and Hydroflourocarbon
installations use copper pipes with solder type
ttings where possible. The use of screw type
ttings in Halocarbon systems should be held
to an absolute minimum, as these refrigerants,
due to their physical properties, will leak through
screw type joints.
When drawn copper tubing is used for Halocar-
bon lines, type “K” or “L” conforming to ASTM
B88 should be used. Soft annealed copper tub-
ing conforming to ASTM B280 can also be used
for tube sizes not larger than 1-3/8” in outside
diameter. These requirements are in accordance
with the mechanical code for refrigeration ANSI
B9.1-1971. The type of copper tubing to be used
for a given pressure is dependent on the strength
of the copper at the design temperature. Some
local codes forbid the use of Type “L”. Therefore,
before installation, be sure to check local require-
ments. Never use type “M” as it does not have
adequate wall thickness to withstand the operat-
ing pressures. In selecting ttings for Halocarbon
piping, only wrought copper ttings should be
used. Cast ttings as used for water service are
porous and will allow the refrigerant to escape.
Note this exception: In larger pipe sizes, wrought
fittings are not available. However, specially
tested cast ttings are available and these may
be used with complete safety.
In larger pipe sizes, wrought ttings are not avail-
able. However, specially tested cast ttings are
available and these may be used with complete
safety.
When soldering copper tubing joints, only silver
solder should be used for Refrigerant-22 service.
Soft solder such as “50-50” should never be used,
as its melting point is too low, lacks mechanical
strength, and tends to break down chemically in
the presence of moisture.
A second method would be to install exible
pipe couplings as close to the compressor unit
as possible with connections run in two different
directions, 90° apart. These exible connections
should be installed on both the high and low side
lines of the compressor unit.
Hangers and supports for coils and pipe lines
should receive careful attention. During pro-
longed operation of the coils, they may become
coated with ice and frost, adding extra weight to
the coil. The hangers must have ample strength
and be securely anchored to withstand the
vibration from the compressor and adequately
support the pipe lines.
Water supply and drain connections, and equip-
ment using water, should be installed so all the
water may be drained from the system after
the plant has been shut down in cold weather.
25
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 eld mounted starters and package mounted
motors.
Additional control wiring in the eld is also re-
quired. Dry contacts are provided in the control
panel for starting the screw compressor motor.
These contacts are to be wired in series with the
starter coils. A current transformer is supplied
along with the compressor unit, and is located
in the motor junction box. This transformer is to
be installed around one phase of the compres-
sor motor starter. A normally open auxiliary
contact from the compressor motor starter is
also required.
Terminal locations for this wiring can be found
on the wiring diagram supplied with this unit.
Additional aspects of the electrical operation of
the single screw units are covered in the start up
and operation section of this manual.
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 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-
ce, however, it is advisable to check local codes
as they may differ. Before testing may proceed,
several things must be done.
First, if test pressures exceed the settings of
the system, relief valves or safety devices, they
must be removed and the connection plugged
during the test. Secondly, all valves should be
opened except those leading to the atmosphere.
Then, open all solenoids and pressure regula-
tors by the manual lifting stems. All bypass
arrangements must also be opened. Because
of differences in characteristics of the various
refrigerants, two different testing methods are
necessary.
A. Ammonia Systems
Dry nitrogen may be used to raise the pressure
in an ammonia system to the proper level for
the test. The gas may be put into the system
through the charging valve or any other suitable
opening. Adjust the pressure regulator on the
bottle to prevent over-pressurization. Do not
exceed the pressure rating on the vessel with
the lowest pressure rating.
Carbon Dioxide should NOT be used as a test-
ing gas in a system where ammonia is already
dissolved in any moisture remaining. This will
cause ammonium carbonate to precipitate
when the CO2 is added. If heavy enough, this
precipitate may cause the machine to freeze
and clog the strainer.
A mixture of four parts water to one part liquid
soap, with a few drops of glycerin added, makes
a good solution. Apply this mixture with a one
inch round brush at all anges, threaded joints,
and welds. Repair all visible leaks. If possible,
leave the pressure on over night. A small pres-
sure drop of 5 lbs. Over this period indicates a
very tight system.
Remember to note the ambient temperature,
as a change in temperature will cause a change
in pressure.
After the system is thoroughly tested, open all
Installation
26
valves on the lowest part of the system so the gas
will 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
anged, welded, screwed and soldered joints, all
gasketed joints, and all parting lines on castings.
If any leaks are found, they must be repaired and
rechecked before the system can be considered
tight again, remembering that no repair should
be made to welded or soldered joins while the
system is under pressure.
C. Evacuating The System
A refrigeration system operates best when only
refrigerant is present. Steps must be taken to
remove all air, water, vapor, and all other non-
condensables from the system before charging it
with refrigerant. A combination of moisture and
refrigerant, along with any oxygen in the system,
can form acids or other corrosive compounds that
corrode internal parts of the system.
To properly evacuate the system, and to remove
all non-condensables, air and water vapor, use a
high vacuum pump capable of attaining a blanked
off pressure of 50 microns or less. Attach this
pump to the system and allow it to operate until
system pressure is reduced somewhere below
1000 microns. Evacuation should not be done
unless the room temperature is 60F or higher.
Attach vacuum gauge(s), reading in the 20 to
20,000 micron gauge range, to the refrigerant
system. These gauge(s) should be used in con-
junction with the high vacuum pump. The read-
ing from the gauge(s) indicates when the system
has reached the low absolute pressure required
for complete system evacuation.
Connect the high vacuum pump into the re-
frigeration system by using the manufacturer’s
instructions. Connect the pump both to the high
side and low side of the system, to insure system
evacuation. Attach the vacuum gauge to the
system in accordance with the manufacturer’s
instructions.
A single evacuation of the system does not satis-
factorily remove all of the non-condensable, air
and water vapor. To do a complete job, a triple
evacuation is recommended.
When the pump is rst turned on, bring system
pressure to as low a vacuum level as possible, and
continue operation for 5 to 6 hours.
Stop the pump and isolate the system. Allow
the unit to stand at this vacuum for another 5 to
6 hours. After this time, break, the vacuum and
bring the system pressure up to 0 psig with dry
nitrogen.
Installation
27
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 lter and other piping
becomes charged with the normal amount of
oil that will be in circulation. This drop in oil
level should bring the level in the oil receiver/
separator into the normal operating range. Do
not mix oils.
A. Oil For Single Screw Compressors
Due to the need for adequate lubrication, Vilter
recommends only the use of Vilter lubricants,
designed specifically for Vilter compressors.
With the extensive research that has been per-
formed, we are able to offer refrigerant speci c
lubricating oils. Use of oil not speci ed or sup-
plied by Vilter will void the compressor warranty.
Please contact your local Vilter representative or
the Home Of ce for further information.
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
28
After the system is leak-free and evacuation has
been completed, it is ready for charging. Before
actual charging, however, the entire operation
of the refrigeration system should be inspected
as outlined below:
A. Low Side Equipment
1. Fans on air handling equipment running.
2. Pumps on water cooling equipment run-
ning.
3. Proper location and attachment of thermo-
static expansion valve bulb to suction line.
4. Correct fan and pump rotation.
5. Evaporator pressure regulators and solenoid
valves open.
6. Water pumps and motors correctly aligned.
7. Belt drives correctly aligned and tensioned.
8. Proper voltage to motors.
B. Compressors
1. Proper oil level.
2. Voltage agrees with motor characteristics.
3. Properly sized motor fuses and heaters.
4. Direct drivers aligned and couplings tight.
5. All suction and discharge valves open.
6. All transducers and RTD’s calibrated and
reading correctly.
C. Condensers
1. Water available at water cooled condensers
and supply line valve open.
2. Water in receiver of evaporative condenser
and makeup water available.
3. Correct rotation of pump and fan motors.
4. Belt drives aligned and tensioned correctly.
5. Pump, fans and motors lubricated.
D. Controls
Controls should be at the initial set points. See
microprocessor manual for further information.
E. Initial Charging – High Side Charging
There are two methods of charging refriger-
ant into the system, through the “high side” or
through the “low side”. High side charging is
usually used for initial charging as lling of the
system is much faster. Low side charging is
usually reserved for adding only small amounts
of refrigerant after the system is in operation.
High side charging of refrigerant into the system
is accomplished as follows:
1. Connect a full drum of refrigerant to the
liquid charging valve. This valve is gener-
ally located in the liquid line immediately
after the king or liquid line valve. Purge the
air from the charging line.
2. Invert the refrigerant drum if the drum is
not equipped with “Liquid” and “Vapor”
valves, and place in such a position so the
liquid refrigerant only can enter the sys-
tem. Close the liquid line or king valve, if
it is not already closed. Open the “Liquid”
charging valve slowly to allow refrigerant
to enter the system. The vacuum in the
system will draw in the refrigerant.
It is important that, during this operation,
air handling units be running and water is
circulating through the chillers. The low
pressures on the system can cause the
refrigerant to boil at low temperature and
possibly freeze the water if it is not kept
circulating.
Water freezing in a chiller can rupture the
tubes and cause extensive damage to the
system. It would be desirable to charge
the initial amount of refrigerant without
water in the shell and tube equipment to
eliminate the possibility of freeze up.
3. After some refrigerant has entered the
system, the compressor unit starting pro-
cedure may be followed. See Start-Up and
Operation Section of this manual.
4. Continue charging refrigerant into the
system until the proper operating require-
ments are satis ed. Then, close the liquid
charging connection and open the liquid
line valve allowing the system to operate
normally. To check that enough refriger-
ant has been added, the liquid sight glass
Installation
29
should show no bubbles, and there will be a
liquid seal in the receiver. If these two condi-
tions are not satis ed, additional refrigerant
must be added.
5. When sufficient refrigerant has been
charged into the system, close the charging
and drum valves. Then remove the drum
from the system.
6. During the charging period, observe the
gauge carefully to insure no operating dif-
culties. Watch head pressures closely to
make sure the condensers are functioning
properly.
Since it is usually necessary to use several drums
when charging a system, follow the procedures
in paragraphs E1 and E2 of the above description
when attaching a new drum. After charging,
the refrigerant drums should be kept nearby for
several days as it is sometimes necessary to add
more refrigerant as the system “settles down”.
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 lter inlet and outlet pres-
sures for excessive pressure drop. Change
lter when pressure drop exceeds 45 psi or
every six months, whichever occurs rst. For
proper procedure for changing micronic oil
lter and for charging oil into the system, see
Operation Section.
4. Clean strainers each time lter cartridge
if replaced.
5. Check compressor sound for abnormal
noises.
6. Check shaft seals for excessive oil leakage.
A small amount of oil leakage (approxi-
mately 10 drops/min) is normal. This
allows lubrication of the seal faces.
B. Weekly
(Items 1 thru 6 above plus 7 thru 9)
7. Check the refrigeration system for leaks
with a suitable leak detector.
8. Check oil pressures and review micropro-
cessor log and log sheets.
9. Check refrigerant levels in vessels.
C. Monthly
(Items 1 thru 8 above plus 9 thru 13)
10. Oil all motors and bearings. Follow manu-
facturer’s instructions on lubrication.
11. Check calibration and operation of all
controls, particularly safety controls.
12. Check oil cooler for any evidence of cor-
rosion, scaling or other fouling.
13. Operate compressor capacity and volume
ratio controls through their range both
automatically and manually.
D. Trimonthly
(About 2000 operating hours)
Check movement of compressor rotor at drive
coupling end to determine bearing oat. (Re-
fer to Service Section.)
E. Yearly
(Items 1 thru 13 and “D” above plus 14
thru 28)
14. Check entire system thoroughly for leaks.
Installation
30
15. Remove all rust from equipment, clean and
paint.
16. Flush out sediment, etc. from water circuits.
17. Clean all oil strainers.
18. Clean suction strainer – compressors.
19. Check motors and fans for shaft wear and
end play.
20. Check operation and general condition of
microprocessor and other electrical con-
trols.
21. Clean all water strainers.
22. Check drains to make sure water will ow
away from equipment.
23. Drain and clean entire oil system at receiver
drain. Recharge with new clean moisture
free oil. For proper procedure for changing
micronic oil lter and charging oil into the
system, see Start-Up and Operation section.
24. Check compressor coupling. For integrity
and alignment.
25. Check oil pump for wear.
26. Check the calibration of the microprocessor
pressure transducers and RTD’s for accu-
racy.
27. Check mounting bolts for compressor and
motor.
F. System Leaks
There are any number of reasons why leaks
develop in a refrigeration system (i.e. such as
drying out of valve packing, yielding of gaskets,
improper replacement of valve caps and loosen-
ing of joints due to vibration). For these reasons,
the need for periodic leak testing cannot be over-
emphasized. Similarly, when any service opera-
tions are performed on the system, care should
be exercised to insure all opened flanges are
tightened, all plugs that were removed are re-
placed with a suitable thread lling compound,
all packing glands on valve stems are tightened,
and all valve caps are replaced. When operation
is restored, all joints opened or any valves moved
during the servicing should be checked for leaks.
G. Year Round Operation
On a continual basis:
1. Guard against liquid slugging of compres-
sor.
2. Maintain unit in clean condition and paint
as necessary.
3. Grease valve stems and threads for the
valve caps.
When refrigeration equipment is operated 24
hours a day year round, it is highly recommend-
ed that a yearly check of all internal parts be
made (see Service Section). While the highest
material standards are maintained throughout
all Vilter compressors, continuous operation
and any presence of dirt may prove injurious to
the machine. To forestall needless shutdowns
or prevent possible machine breakdowns, the
side covers should be removed yearly, and a
visual inspection be made of the internal parts.
In this way, a small amount of time spent check-
ing machine conditions once a year may prevent
extensive shutdowns later with subsequent
product loss and expensive repairs.
Installation
31
Stop Check Valve Installation
Installation:
The new design will apply only to the 2” thru 4” stop valves. Retro tting a eld installation will
require replacing the bonnet assembly.
The bonnet must be installed with the spring towards the bottom (see illustrations above).
The drill xture is designed so that the hole for the spring will always be drilled on the oppo-
site side from the cast-in Vilter name on the bonnet. From the outside of the valve, the casting
numbers must always be towards the top of the valve.
See Operation Section on Stop Check Operation.
Correct
Wrong Wrong
Correct
Verify the location of the Spring and note the Vilter name.
32
COUPLING INFORMATION
COUPLINGS INSTALLATION AND ALIGNMENT
These instructions are intended to help you to install
and align the coupling. Covered here will be general
information, hub mounting, alignment, assembly,
locknut torquing, discpack replacement, and part
numbers. The coupling as received, may or may not
be assembled.
*If assembled, the locknuts are not torqued.
*If coupling is assembled, remove the bolts that at-
tach the hubs to the disc packs. Remove both hubs.
Leave the disc packs attached to the center member.
A. Hub Mounting:
1. Clean hub bores and shafts. Remove any nicks
or burrs. If bore is tapered, check for good contact
pattern. If the bore is straight, measure the bore
and shaft diameters to assure proper t. The key(s)
should have a snug side-to-side t with a small
clearance over the top.
NOTE: If the hub position on the shaft does not allow
enough room to install the short bolts in the hub after
hub mounting, install the bolts and disc pack before
mounting hub on shaft.
B. Straight Bore:
1. Install key(s) in the shaft. If the hub is an interfer-
ence t, heat the hub in an oil bath or oven until
bore is suf ciently larger than the shaft. 350º F.
is usually suf cient. An open ame is not recom-
mended. However, if ame heating is necessary,
use a very large rose bud tip to give even heat
distribution. A thermal heat stick will help deter-
mine hub temperature. DO NOT SPOT HEAT THE
HUB OR DISTORTION MAY OCCUR. With the hubs
expanded, slide it up the shaft to the desired axial
position. A pre-set axial stop device can be helpful.
C. Taper Bore:
1. Put the hub on the shaft without key(s) in place.
Lightly tap hub up the shaft with a soft hammer.
This will assure a metal-to-metal t between shaft
and hub. This is the starting point for the axial
draw. Record this position between shaft and hub
face with a depth micrometer. Mount a dial indica-
tor to read axial hub movement. Set the indicator
to “0”. Remove hub and install key(s). Remount
hub, drawing it up the shaft to the “0” set point.
Continue to advance hub up the taper to the de-
sired axial position. Use the indicator as a guide
only. A pre-set axial stop device can be helpful.
Check the nal results with a depth micrometer.
The hub may have to be heated in order to reach
the desired position on the shaft. DO NOT SPOT
HEAT THE HUB OR DISTORTION MAY OCCUR.
Install shaft locknut to hold hub in place.
D. Shaft Alignment.
Move equipment into place.
1. Soft Foot. The equipment must sit at on its
base (+/- 0.002 inches). Any soft foot must be
corrected now.
2. Axial Spacing. The axial spacing of the shafts
should be positioned so that the disc packs ( ex-
ing elements) are flat when the equipment is
running under normal operating conditions. This
means there is a minimal amount of waviness in
the disc pack when viewed from the side. This
Coupling Installation
33
will result in a exing element that is centered and
parallel to its mating ange faces. Move the con-
nected equipment to accomplish the above.
NOTE: The disc pack is designed to an optimal thick-
ness and is not to be used for axial adjustments.
See documentation that came with the coupling for
complete speci cations.
3. Angular Alignment. Rigidly mount a dial indicator
on one hub or shaft, reading the face of the other
hub ange, as shown on next page. Rotate both
shafts together, making sure the shaft axial spacing
remains constant. Adjust the equipment by shim-
ming and/or moving so that the indicator reading
is within .002 inch per inch of coupling ange.
4. Parallel Offset. Rigidly mount a dial indicator on
one hub or shaft, reading the other hub ange out-
side diameter, as shown in Figure 3. Indicator set-up
sag must be compensated for. Rotate both shafts
together. Adjust the equipment by shimming and/
or moving so that the indicator reading is within
.002 inch per inch of the axial length between ex
elements. See drawing below.
Note: If the driver or driven equipment alignment
speci cation is tighter than these recommendations,
the speci cation should be used. Also, be sure to
compensate for thermal movement in the equipment.
The coupling is capable of approximately four time
the above shaft alignment tolerances. However, close
alignment at installation will provide longer service
with smoother operation.
E. Final assembly
With the coupling in good alignment the bolts will t
through the holes in the anges and the disc packs
more easily.
1. If the coupling arrived assembled, the disc packs
are still attached to the center ring. Before tak-
ing the discs packs off, rst install one hub bolt
through each disc pack and secure with lock out.
This will help when the pack is reinstalled late. If
the coupling was shipped disassembled, the bolt
through the pack is not required as the discs in the
pack are factory taped together.
2. Remove the long bolts. Mount the disc packs
on the hubs with one bolt through the disc pack
aligned with a clearance hole in the hub. Install
the short bolts through the hub, disc pack, bevel
washer or link, and secure with a lockout.
NOTE: All bolt threads should be lubricated. A clean
motor oil is recommended. On size 226 and larger, a
link must be put on bolt rst. Remove the disc pack
alignment bolt. Proceed to mount the second disc
pack to the other hub in the same way.
3. Position one set of short bolts in each hub on
top. Now slide the center ring down into place
straddling the short bolts with the center ring
bushings. If coupling is dynamically balanced, the
center ring match marks must lineup with both
hub match marks. When one bushing is in-line
with the hole in the disc pack, slide one long bolt
through washer or link, disc pack, center ring,
disc pack, washer or link, and then secure with a
locknut. On size 226 and larger a link must be put
on the bolt rst. Now install the rest of the long
bolts in the same manner.
Note: Alignment of C-Flange Units should be
checked when compressor or motor are replaced.
Installation
34
4. Torque the long bolt locknuts at this time.
NOTE: With the coupling in good alignment, the bolts
will t through the holes in the anges and the disc
pack more easily. It is recommended that all locknuts
be retightened after several hours of initial operation.
5. For further help with the installation or align-
ment, consult Rexnord.
F. Disc Pack Replacement.
If it becomes necessary to replace the disc pack, it can
be done as follows:
1. Remove all the long bolts and lower the center
ring by sliding it our from between the two disc
packs.
2. Remove one short bolt from the disc pack/hub
connection and reinstall it through a hub clearance
hole and into the hole in the disc pack. Put the nut
on. This will keep the discs together and maintains
the disc orientation for later reinstallation. Remove
the rest of the short bolts and takeoff the disc pack.
Repeat for the second disc pack.
3. Replace the pack(s) if required. Recheck align-
ment per Section D. Reassemble per Section E.
Installation
35
Slide Valve Actuator Installations Instructions
Caution
WHEN INSTALLING THE OPTICAL SLIDE MOTOR,
LOOSEN LOCKING COLLAR BEFORE SLIDING THE
COLLAR DOWN ON THE SHAFT. DO NOT USE A
SCREWDRIVER TO PRY LOCKING COLLAR INTO
POSITION.
OVERVIEW
Calibration of an optical slide valve actuator is a two
step process that must be done for each actuator
installed of the compressor. Brie y, the steps are as
follows.
1) The actuator motor control module, located
inside the actuator housing, is calibrated so
that it knows the minimum and maximum ro-
tational positions of the slide valve it controls.
The calibrated actuator will output 0 VDC at the
minimum position and 5 VDC at the maximum
position.
2) After the actuator motor control module has been
calibrated for 0-5Volts, the controlling channel
corresponding to the actuator motor (either the
capacity or volume) has to be calibrated. This
instructs the control panel to learn the rotational
0% position & rotational 100% position of the slide
valve travel.
PLEASE NOTE:
Because there is an optical sensor on this motor, do
not attempt calibration in direct sunlight.
ACTUATOR MOTOR CONTROL
MODULE CALIBRATION PROCEDURE
1. Disable the Slide Non-Movement Alarm by
going to the “Setup” menu on the control
panel and choosing “Alarm Disable” for the
Slide Non-Movement Option. (If applicable).
2. Completely shut off the power to the control
panel completely.
3. If not already done, mount the slide valve
actuator per (“Vilter Actuator set up for
Capacity and Volume Slide Motors). Next,
wire the actuator per the attached wiring
diagrams, using the already installed electri-
cal conduit to run the cables. The old wiring
can be used to pull the new cables through
the conduit to the control panel. The cables
may also be externally tie-wrapped to the
conduit. Run the yellow AC power cable(s)
and the gray DC position transmitter
cable(s) in different conduit. This prevents
the DC position transmitter cable from pick-
ing up electrical noise from the AC power
cable. Do not connect either of the cables
to the actuators yet.
In addition, if the actuators are replacing old gear-
motors on early units, you must remove the capaci-
tors and associated wiring from inside the control
panel. This is necessary to prevent electrical damage
to the new actuator motor.
4. When completing the calibration of the
new actuators, the motors are signaled to
move to below 5%. This may not completely
occur when exiting the calibration screen
due to a “program timer”. HOWEVER,
when the compressor actually starts, the
motors will travel below 5% and function
correctly. The user may see that the actua-
tors are not below 5% after calibration and
try to find the reason. If the calibration
screen is re-entered right away and then
exited, the timer will allow the actuator to
go below the 5% on the screen. This may be
perceived as a problem; in reality,it is not.
5. Note:
The 0 to 5V-position transmitter output of
the actuator will uctuate wildly during the
calibration process. To prevent damage to
the actuators, do not connect the yellow
power cable or the gray position transmitter
cable until instructed to do so later on.
6. Open the plastic cover of the capacity motor by
removing the four #10 screws.
Slide Valve Actuator Installation & Calibration
36
Caution: there are wires attached to the con-
nector on the plastic cover. Handling the
cover too aggressively could break the wires.
7. Gently lift the cover and tilt it toward the Turck
connectors. Raise the cover enough to be able
to press the blue calibrate button and be able
to see the red LED on the top of assembly.
8. Press “Menu” on the main screen and then press
the “Slide Calibration” button, to enter the slide
calibration screen. (Note: you must be in this slide
calibration screen before attaching the yellow
power cable or gray position transmitter cable.)
9. Now connect the yellow power cable and the
gray position transmitter cable to the actuator.
10. Press INC and DEC to move the slide valve and check
for the correct rotation. See Table 1on page 48 for
Actuator/command shaft rotation speci cations.
11. Note: If the increase and decrease buttons do
not correspond to increase or decrease shaft
rotation, swap the blue and brown wires of
the “yellow power cable”. This will reverse
the rotation of the actuator/command shaft.
12. Quickly press and release the blue push but-
ton on the actuator one time. This plac-
es the actuator in calibration mode. The
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 uctuate during calibra-
tion. After the actuator has been calibrated,
0V output will correspond to the minimum
position and 5V to the maximum position.
14. Note: The “Slide calibration” screen on the con-
trol panel has a “Current” window, which displays
twice the actuator output voltage. This value,
(the % volume and the % capacity) displayed in
the “Current Vol” and Current Cap” Windows are
meaningless until calibration has been completed.
15. Use the DEC button on the control panel to
drive the slide valve to its minimum “mechani-
cal stop” position. Do not continue to run the
actuator in this direction after the slide valve
has reached the stop. Doing so may cause dam-
age to the actuator or the slide valve. When
the slide has reached the mechanical stop posi-
tion, use the INC button to pulse the actuator
to where the slide is just off of the mechanical
stop and there is no tension on the motor shaft.
16. Quickly press and release the blue button on
the actuator again. The red LED will now ash
at a slower rate, indication that the minimum
slide valve position (0V position) has been set.
17. Use the INC button on the control panel to drive
the slide to its maximum “mechanical stop” posi-
tion. Do not continue to run the actuator in this
direction after the slide valve has reached the
stop. Doing so may cause damage to the actua-
tor or the slide valve. When the slide valve has
reached the mechanical stop position, use the
DEC button to pulse the actuator to where the
slide is just off of its mechanical stop and there
is no tension on the motor shaft.
18. Quickly press and release the blue button on the
actuator one more time. The red LED will stop
ashing. The actuator is now calibrated and knows
the minimum and maximum positions of the slide
valve it controls. Now the capacity or volume
channel of the control panel can be calibrated.
19. Use the Dec button to move the actuator towards
its minimum position while watching the milli-
volt readout on the control panel screen. Discon-
tinue pressing the DEC button when the millivolt
reading in the “Current” window above the “Set
Min” button is approximately 500 millivolts.
20. Now use the DEC and INC buttons to position the
slide valve until a value close to 300 millivolts is on
the screen. Then, press the “Set Min” button for
the capacity or volume slide valve window to tell
the controller that this is the minimum millivolt
position. Note: The value in the “Current Cap” or
“Current Vol” window has no meaning right now.
Slide Valve Actuator Installation & Calibration
37
21. Use the INC button to rotate the actuator to-
wards its maximum position while watching
the millivolt readout on the controller screen.
Discontinue pressing the INC button when
the millivolt reading in the “Current” window
is approximately 9200 millivolts (7900 mil-
livolts for the 2783J quali ed analog boards).
You are nearing the mechanical stop position.
22. Pulse the INC button to carefully move the slide
valve until the millivolt readout “saturates”, or
stops increasing. This is around 9500 millivolts
(8400 millivolts for 2783 quali ed analog boards).
23. Pulse the DEC button until the millivolts just
start to decrease. (This is the point where
the channel drops out of saturation).Ad-
just millivolt value to 300 millivolts below
recorded maximum millivolts in step #22.
24. Press the “Set Max” button.
25. Press the “Main” button to complete calibra-
tion and exit the “Slide Calibration” screen.
The controller will automatically energize
the actuator and drive it back to its mini-
mum position (below 5%) for pre-start-up.
26. Note: Now the “Current Cap” or the “Current
Vol” value will be displayed in the window on the
“Main” screen and the “Slide Calibration” screen.
27. Gently lower the plastic cover over the top
of the actuator to where it contacts the base
and o-ring seal. After making sure the cover
is seated properly, gently tighten the four
#10 screws. Caution: The plastic cover
will crack if the screws are over tightened.
28. Enable the “Slide Non-Movement Alarm” by go-
ing to the “Setup” menu and choosing “Alarm
Enable” for the “Slide Non-Movement Option”.
29. This completes the calibration for this chan-
nel either capacity or volume. Repeat the
same procedure to the other channel.
Slide Valve Actuator Installation & Calibration
38
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
39
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
40
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.
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
41
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.
42
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
43
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
44
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 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
45
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
TANK
INLET
OUTLET
Operation
46
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
47
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
48
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
49
“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 gure #6)
50
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”
51
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.
SG
HAND EXPANSION
VALVE
TO COMPRESSOR
STRAINER
SIGHT
GLASS
VALVE
CHECK
52
Pre Start-Up Checklists
The following checklists are to help prepare the equipment before the Vilter Technician arrives at the
jobsite. Vilter recommends that a Trained Technician go through the following tasks. The operating
Manuals provided by Vilter, can be referenced for any type of questions or special instructions.
Every Refrigeration unit includes a Vilter Start-Up (Con rm on PO). The following tasks are not included
in the Vilter Start-up provided in your equipment purchase. Any tasks below that are done by the Vilter
Technician will take away from the pre-determined time that was provided with the equipment pur-
chase. Vilter suggests that the Vilter Technician’s time be used during the start-up of the System and
not for the below System Preparation.
Note: Each item below MUST be “Checked-Off”, Signed and Returned to the Vilter Service Department.
Failure to do so will “Null & Void” future Warranty considerations.
53
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 #________________________
54
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 #________________________
55
Stop Check Valve Operation
AUTO
In the “Auto Position”, the stop valve is
operating as a check valve, allowing ow
in the directions of the arrows.
To set the valve to the automatic posi-
tion, fully close the valve, and turn the
stem out as indicated by the chart below.
CLOSED
In the manually “Closed Postion”, the
stop check is operating as a conventional
stop valve, not allowing ow in either
direction.
OPEN
In the manually ” Open Position”, with
the valve stem fully back seated, the
valve disc is lifted slightly, allowing ow
in either direction.
Valve Size 1.5” 2” 2.5” 3” 4” 5” 6” 8”
Number of Turns Open 2 2.25 2.75 3.25 4.5 3.75 5.75 7.75
(from closed position)
56
A) Disconnect the motor drive coupling from the
compressor input shaft.
B) Disconnect all gas and oil piping which is at-
tached to the compressor. When removing the
suction strainer on gas compression units, the
suction line should be supported to prevent it
from sagging.
C) Replace oil drain in compressor housing and dis-
charge manifold after oil has stopped draining.
D) Remove all electrical connections to the com-
pressor.
E) On compressors with mounting feet, loosen and
remove bolts holding the compressor to the
base.
Keep compressor alignment shims together and
mark the locations with a permanent marker.
F) On compressors with C-flange the motor/C-
ange/compressor assembly must be supported
with a chain fall or other lifting device before the
bolts holding the compressor to the C- ange
adapter can be removed.
G) Install appropriate lifting eye into the threaded
hole on the top of the compressor.
Verify unit is properly secured to avoid compressor
from falling. Re-verify all piping and electrical are
properly disconnected prior to lifting unit.
H) Lift compressor from the base, verify the amount
of room needed for clearance and weight of
the bare compressor when the compressor is
removed from the unit.
GENERAL COMMENTS
When working on the compressor, care must be taken
to ensure that contaminants (i.e. water from melting
ice, dirt and dust) do not enter the compressor while
it is being serviced. It is essential that all dust, oil or
ice that has accumulated on the outside of the com-
pressor be removed before servicing the compressor.
When servicing the compressor, all gaskets, O-rings,
roll pins and lock washers must be replaced when
reassembling the compressor.
PREPARATION OF UNIT FOR SERVICING
A) Shut down the unit, open the electrical discon-
nect switch and pull the fuses for the compressor
motor to prevent the unit from starting. Put a
lock on the disconnect switch and tag the switch
to indicate that maintenance is being performed.
B) Isolate the unit by manually closing the discharge
Stop valve. Allow the unit to equalize to suction
pressure before closing the Suction Bypass. After
the unit has equalized to suction pressure and
suction valve closed, use an acceptable means to
depressurize the unit that complies with all Local,
State and Federal Ordinances.
C) Remove drain plugs from the bottom of com-
pressor housing and the discharge manifold On
units equipped with Suction Oil Injection (SOI)
manually open the SOI solenoid valve below the
compressor. Drain the oil into appropriate con-
tainers.
REMOVAL OF COMPRESSOR FROM THE UNIT
After preparing the unit for service, the following steps
should be followed when removing the compressor
from the unit:
Service
57
INSTALLATION OF THE COMPRESSOR
A) After the work has been completed, reinstall
the compressor on the base or C- ange adapter
(dependent upon compressor model).
B) On the units, replace the shims under the com-
pressor feet. Check for a soft foot. This is ac-
complished by tightening down three of the hold
down bolts and checking the clearance under the
fourth compressor foot. If there is clearance, add
the appropriate amount of shims. Tighten down
the fourth bolt and loosen either adjacent bolt
and check again for clearance, adding shims ac-
cordingly. Align the compressor and motor.
On compressors the discharge elbow should
be tightened on the separator rst, before the
compressor manifold ange is tightened. This
should be done to prevent compressor to motor
misalignment.
Replace all electrical, gas and oil connections
removed when servicing the compressor.
LEAK CHECKING UNIT
Note: Unit can be leak checked before evacuation.
CAUTION
Slowly pressurize the unit from the discharge side of the
compressor. Pressurizing the compressor from the suc-
tion side may cause rotation of the compressor without
oil supply, which could lead to internal damage.
A) Use a vacuum pump to evacuate the unit.
B) Break the vacuum on the unit using dry nitrogen
and check for leaks. Concentrate on areas where
work was done.
C) If no leaks are found, the unit can be returned to
service.
Service
58
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
recti ed. At this time, the bearing oat is measured
for the main rotor and gate rotors.
The following are the procedures used in measuring
the main rotor and gate rotor bearing oat.
BEARING CHECK
CAUTION
When taking the measurements, do not exceed 250
to 300 Lbs. of force at point of contact or damage
may result to the bearings
A) Shut down and de-pressurize the unit.
B) Main rotor bearing oat.
1) Remove the coupling guard, then remove
the center member from the coupling.
2) Attach a dial indicator to the compressor
frame as shown and zero indicator. Place a
lever arm and fulcrum behind the compres-
sor coupling half and push the coupling
towards the motor (note measurement).
TABLE.1 MAXIMUM BEARING FLOAT
3) Re-Zero indicator, now position the fulcrum
on the motor and use the lever arm to push
the input shaft towards the compressor
(note measurement).
MAIN GATE
Bearing Float 0.003” 0.002”
Maximum Force 250 to 300 50 to 100
Lbs. Lbs.
Service
Direction of rotor movement.
Axial force at gate rotor to be
250 to 300 lbs.
Wooden block to prevent
damge to gate rotor blade.
Force to be determined
by length of level arm.
Use bolt for fulcrum.
Rigidly attach
dial indicator.
Side View
Showing gate rotor bearing float
being measured.
59
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 oat and this should not
exceed 0.003”.
C) Gate rotor bearing oat.
1) Remove the side covers and position a dial
indicator on the gate rotor.
2) Use a lever arm pivoting on a bolt with a small
block of wood against the gate rotor blade to
protect the blade.
3) The maximum amount of bearing float
should not exceed 0.002”.
D) Measure the gate rotor to blade float. Some
movement between blade and support is neces-
sary to prevent damage to the compressor blade,
however at no time should the blade uncover the
support.
1) Position the blade with the gate rotor damper
pin and 90º to the main rotor.
2) Position a dial indicator at the tip of the sup-
port. The total movement of the damper pin
in the bushing is the gate rotor oat. Refer to
table 0.2 to nd the maximum blade to sup-
port oat (on new compressor parts only).
MODEL FLOAT
VSM 301 THRU 401 0.045”
VSM 501 THRU 701 0.045”
VSS 291 THRU VSS 601 0.045”
VSS 751 & VSS 901 0.055”
VSS 1051 THRU VSS 1301 0.060”
VSS 1551 & VSS 2101 0.060”
Service
60
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
61
E) Remove the hex head and socket head bolts from
the thrust bearing cover. Insert two of the bolts
into the threaded jacking holes to assist in remov-
ing the cover. Retain the shim pack and keep it
with the bearing housing cover.
F) Hold the gate rotor support with a suitable wrench
on the ats provided near the roller bearing hous-
ing. Remove the inner retainer bolts and the
retainer. To remove the thrust bearing housing,
install the thrust bearing removal and installation
tool with the smaller puller shoe. Turn the jacking
screw clockwise. The thrust bearings and housing
assembly will be pulled off the shaft and out of the
frame.
G) Remove the bolts on the roller bearing housing.
Thread two bolts into the jack screw holes pro-
vided in the housing to assist in removing it.
H) To remove the gate rotor support, carefully move
the support opposite the direction of rotation and
tilt the roller bearing end towards the suction end
of the compressor. The compressor input shaft
may have to be turned to facilitate the removal of
the gate rotor support. On dual gate compressor
units, repeat the procedure for the remaining gate
rotor support assembly.
Service
62
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
63
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
64
INSTALLATION (All VSS Models)
A) Install the gate rotor support by carefully tilting
the roller bearing end of the gate rotor support
towards the suction end of the compressor. The
compressor input shaft may have to be rotated
to facilitate the installation of the gate rotor sup-
port.
Install gate rotor stabilizer. The gate rotor sta-
bilizer (901) will hold the gate rotor support
in place as the thrust bearing housing is being
installed. If the gate rotor support is not re-
stricted from moving, the gate rotor blade may
be damaged.
B) Install the roller bearing housing (112) with a
new O-ring (141). Tighten the bolts (152) to the
recommended torque value.
C) When installing the thrust bearing housing
(113), a new O-ring (142) must be used when
the housing is installed. Lubricate the outside of
the housing and bearings with clean compressor
oil to aid in the installation. Due to the t of the
bearings on the gate rotor shaft, the thrust bear-
ing removal and installation tool with the pusher
shoe must be used. Turn the jacking screw clock-
wise. This will push the thrust bearings onto the
shaft and push the housing assembly into the
frame. Install the inner retainer (115) and bolts
(151) using Loctite® 242 thread locker. Tighten
the bolts to the recommended torque value.
Service
65
D) Set the clearance between the gate rotor blade
and the shelf.
1. Place a piece of 0.003”-0.004” shim stock
between the gate rotor blade and the shelf.
2. Measure the depth from the top of the com-
pressor case to the top of the thrust bearing
housing. This determines the amount of
shims needed for the correct clearance.
3. Use factory installed shim pack (106) and
bearing housing cover (116) without the O-
ring (143). Check the clearance between the
entire gate rotor blade and the shelf, rotate
the gate rotor to nd the tightest spot. It
should be between 0.003”-0.004”. Make
adjustments, if necessary. It is preferable to
shim the gate rotor blade looser rather than
tighter against the shelf.
Note: Replacement blades are precisely the same
dimensionally as blades installed originally at fac-
tory: Therefore, the same amount of shims will be
required for replacement blades.
E) After clearance has been set install a new O-ring
(143) on bearing housing cover, install cover and
tighten the bolts to the recommended torque
value.
F) Install side cover with a new gasket. Tighten the
bolts to the recommended torque value. The
unit can then be evacuated and leak checked as
outlined in section 0.03.
Service
66
Gaterotor for C- ange Models
INSTALLATION (All VSM 301-701 Models)
A) Install the gate rotor support. Carefully tilt the
roller bearing end of the gate rotor support to-
wards the suction end of the compressor. The
compressor input shaft may have to be rotated
to facilitate the installation of the gate rotor
support.
B) Install the roller bearing housing with a new
O-ring. Tighten the bolts to the recommended
torque value.
C) Install the spindle with shims and o-ring, tighten
the bolts to the recommended torque value,
measure the clearance between the shelf and
blade.
D) Check the clearance between the entire gate
rotor blade and the shelf, rotate the gate rotor
to nd the tightest spot. It should be between
0.003”-0.004”. Make adjustments, if necessary.
It is preferable to shim the gate rotor blade
looser rather than tighter against the shelf.
E) Once the clearance is set remove the spindle.
Install new o-ring, apply Loctite 242 thread
locker to the socket head cap screw clamping
the thrust bearings to the spindle. Torque all
bolts to the recommended torque values.
F) Install side covers with new gaskets. Tighten
bolts to the recommended torque value. The
unit can now be evacuated and leak checked as
outlined in section 0.03.
Service
67
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
68
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
69
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
70
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
71
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.)
72
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
73
shoulder on the input shaft. Make sure the seal
is seated against the shoulder. If the seal is not
fully seated against the shoulder, the shaft seal
carbon will be damaged when the seal cover is
installed.
Maintenance Suggestion:
A spray bottle lled with clean compressor oil
may be used to lubricate the faces of the seals
without touching the seal.
E) Install a new O-ring on the seal cover, making
sure the O-ring is placed in the O-ring groove
and not the oil gallery groove. Lubricate both
seal faces with clean compressor lubricating oil.
F) Carefully install the seal cover on the compressor
shaft, evenly tightening the bolts to the recom-
mended torque values.
G) Install the coupling and coupling guard. The unit
can then be evacuated and leak checked.
Service
MAIN ROTOR ASSEMBLY
Due to the procedures and tools
involved in the disassembly and
reassembly, the main rotor assembly
must be performed by qualified
individuals. Please consult the factory
if maintenance is required.
74
INSPECTION OF SLIDE VALVE ASSEMBLIES IN
THE COMPRESSOR
Prepare the compressor for servicing.
A) Remove the gate rotor access covers. Using a
mirror and ashlight, visually inspect the slide
valve carriage through the gas bypass opening.
Look for any signi cant signs of wear on the slide
valve carriage.
B) To check the clearance of the slide valve clamps,
the gate rotor support must be removed. Refer
to removal of the gate rotor support.
C) Using a feeler gauge, inspect the clearance be-
tween capacity and volume slide valve clamps
and slide valve carriage through the gas bypass
opening. The clearance should be less than
0.002”.
D) If the slide valves are worn in excess of the toler-
ances, the factory should be contacted.
REMOVAL SLIDE VALVE CARRIAGE ASSEM-
BLIES
A) Prepare the compressor for servicing.
B) If only one of the slide valve carriages is removed
only the corresponding gate rotor support
needs to be removed. If both carriages are
removed both gate rotors must be removed.
Remove the gate rotor assemblies.
C) Remove the capacity and volume actuators.
Remove the discharge manifold, capacity and
volume cross shafts and the slide valve racks.
Service
75
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
76
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
77
C) The command shaft bearing (435) is a press
t on the command shaft (413). Remove the
command shaft bearing with a suitable press.
D) Remove the O-ring seal (445) from the com-
mand shaft housing. The command shaft bush-
ing (433 and 436) might have to be removed to
gain access to o-rings. Replace bushing if the
bore is deeply scored or excessively worn.
COMMAND SHAFT BEARING AND O-RING
SEAL REASSEMBLY
A) Install new O-ring seal in housing and lubricate
the O-ring with clean compressor oil. A vent
hole is provided in the command shaft bearing
housing to allow any refrigerant and oil that may
leak past the O-ring seal to vent to atmosphere
and not into the slide valve motor housing.
Install snap ring retainer and washer on the
command shaft.
B) Remove any burrs from the command shaft to
prevent damage to the O-ring when assembling.
Press the command shaft bearing onto the
command shaft. Insert the command shaft into
the housing applying pressure on outer race of
bearing. Make sure the bearing is fully seated
in the command shaft housing. Install the snap
ring retainer in the command shaft housing.
C) Install command shaft assembly.
Reference “Parts
Section” for current
Housing
436
445
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 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.
78
DISCHARGE MANIFOLD INSTALLATION
A) Install (2) guide rods to position the discharge
manifold. Install a new manifold gasket and
the discharge manifold. Install the dowel pins
and bolts, tighten manifold bolts to the recom-
mended torque value.
B) On VSS 451-3001 compressors install the dis-
charge spool or elbow between the discharge
manifold and oil separator with new gaskets.
When installing the discharge elbow tighten
the bolts to the correct torque on the manifold
flange first before tightening the separator
ange bolts. Install the drain plug in the bottom
of the discharge manifold.
C) On VSM 301-701 compressors install the bolts
in the discharge ange. Install the drain plug in
the bottom of the discharge manifold.
D) Install both command shaft assemblies and
control actuators.
SLIDE VALVE GEAR AND RACK INSPECTION
A) Remove the discharge manifold.
B) Check rack to rack clamp and rack clamp spacer
clearance on all four slide valves.
TABLE 4.1
RACK CLEARANCE VALUES
C) Check torque of socket heat cap screws.
D) Check for excessive movement between the
slide valve rack shafts and the rack. The jam nuts
on the end of the slide valve rack shaft should be
tight.
E) Check for loose or broken roll pins in gears.
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”
79
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.
80
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 speci c torque speci 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.
81
Service
USING A TORQUE WRENCH CORRECTLY
TORQUE WRENCHES
USING A TORQUE WRENCH CORRECTLY INVOLVES FOUR PRIMARY CONCERNS:
A. A smooth even pull to the break point is required. Jerking the wrench can cause the pivot point
to break early leaving the bolt at a torque value lower then required. Not stopping when the
break point is reached results in an over torque condition.
B. When more than one bolt holds two surfaces together there is normally a sequence that
should be used to bring the surfaces together in an even manner. Generally bolting is tight-
ened incrementally in a diametrically staggered pattern. Some maintenance manuals specify
a tightening scheme. If so, the manual scheme shall be followed. Just starting on one side and
tightening in a circle can cause the part to warp, crack, or leak.
C. In some cases threads are required to be lubricated prior to tightening the bolt/nut. Whether
a lubricant is used or not has considerable impact on the amount of torque required to achieve
the proper preload in the bolt/stud. Use a lubricant, if required, or not if so speci ed.
D. Unlike a ratchet wrench a torque wrench is a calibrated instrument that requires care. Recali-
bration is required periodically to maintain accuracy. If you need to remove a bolt/nut do not
use the torque wrench. The clockwise/counterclockwise switch is for tightening right hand or
left hand threads not for loosening a fastener. Store the torque wrench in a location where it
will not be bumped around.
82
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
83
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.
84
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
85
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
86
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.
87
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
Or
Group Maintenance
Item
88
Recommended
Spare Parts List
Refer to the Custom Manual
Spare Parts Section for Speci c Applications
Please have your Model # and Sales Order # available when ordering.
These are found on the compressor’s Name Plate.
VSS Parts Section
89
Gate Rotor
111
120
135
119
130
141
131
125
110
126
142
143
118
121 122 123 124
90
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
- N/A
- N/A
- N/A
- N/A
- 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
- N/A
- N/A
- N/A
- 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
91
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
92
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
93
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
94
Main Rotor
207
201
95
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
96
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.
97
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
98
305
300
345
316
347
378
380
350
360
361
363
323
304
343
Capacity SlideVolume Slide Carriage Assembly
Slide Valve Carriage Assembly
99
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
530
536
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 Speci 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.
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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
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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
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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
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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
Voltage
0/2 - 10 V d.c.
Load: 10 k
Analog output
0/4 - 20 mA
Load: ≤ 250
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 )
OFF: contact impedance > 100 k
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
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
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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 reconnec