Table of Contents12

Additional Important Notes13

How to Use this Manual13

Section 1 • General Information13

System Unit Identification14

Bare Shaft Refrigeration and Heat Pump Compressor Model Designations15

Capacity and Volume Control17

Compressor17

Section 2 • Theory of Operation17

Refrigerant and Oil System18

Control System20

Temperature Elements, Pressure Transmitters and Indicators20

Critical Application Guidelines20

Alarm and Shutdown Readings21

Figure 2-2. Basic Single Screw Compressor System22

Single Screw Package Requirements22

Bareshaft Compressor Lifting Points and Weights23

Delivery Inspection23

Rigging and Lifting of the Compressor23

Section 3 • Installation23

Table 3-1. Bareshaft Compressor Component Weights23

Table 3-2. Bareshaft Compressor Component Lifting Hole Sizes23

Figure 3-1. Bareshaft Compressor Lifting Points and Component Weights24

Figure 3-2. Bareshaft Compressor Assembly Center of Gravity (Models 97-127)24

Bareshaft Compressor Center of Gravity (Models 291-2101)25

Figure 3-3. Bareshaft Compressor Assembly Center of Gravity (Models 291-2101)25

Figure 3-4. Bareshaft Compressor Center of Gravity - Discharge Manifold and Main Compressor Assembly25

Bareshaft Compressor Center of Gravity (Models 2401-3001)26

Figure 3-5. Bareshaft Compressor Assembly Center of Gravity (Models 2401-3001)26

Figure 3-6. Bareshaft Compressor Center of Gravity - Discharge Manifold and Main Compressor Assembly26

Compressor Inspections Prior to Installation27

Compressor Mounting27

Notice on Using Non-Vilter Oils27

Recommended On-Site Tools27

Long Term Storage Recommendations28

Long Term Storage Log29

Figure 3-7. Stop/Check Valve Orientation30

Stop/Check Valve Installation30

Piping31

Figure 3-8. Maximum Allowable Flange Loads32

Flange Loads32

Table 3-3. Maximum Allowable Flange Loads32

Slide Valve Actuator Installations Instructions33

Instrumentation Requirements34

Testing Refrigeration System for Leaks35

Control System37

Notice on Using Non-Vilter Oils37

Operation37

Section 4 • Operation37

Slide Valve Actuator Operation39

Calibrate Slide Valve Actuators (for Units Using Vission20/20™)40

Figure 4-2. Actuator Assembly40

Figure 4-3. Slide Valve Calibration Screen (Vission 20/20)41

Figure 4-4. Menu Screen and Slide Calibration Button (Vission 20/20)42

Figure 4-5. Wire Connections for Capacity and Volume Actuators43

Table 4-1. Command Shaft Rotation Specifications44

Figure 4-6. Photo-Chopper45

Calibrate Slide Valve Actuators (for Units Using Compact Logix PLC)46

Figure 4-7. Actuator Assembly46

Figure 4-8. Overview, Main Menu and Instrument Calibration Screens (Compact Logix PLC)48

Figure 4-10. Photo-Chopper49

Figure 4-9. Slide Calibration Screen (Compact Logix PLC)49

Compressor Control with Vission20/20™ Micro-Controller (no Slide Operation)51

Suction Equalizing Line Setup - for VSS/VSM Compressors52

Stop/Check Valve Operation53

Table 4-2. Stop/Check Valve Open Positions53

Maintenance and Service Schedule - for VSS/VSM Unit Only55

Section 5 • Maintenance/Service55

Maintenance and Service Schedule - for VSH/VSSH Unit Only56

Preventive Maintenance, Checks and Services58

Compressor Unit Isolation for Maintenance/Service (Compressors with Slide Valves)59

Preparation of Unit for Servicing60

Recommendations When Servicing (Compressors Without Slide Valves)60

Compressor Unit Leak Check after Servicing61

Oil Sampling61

Compressor Replacement65

Compressor Inspection67

Gaterotor Assembly Replacement (All Compressors Except VSM 301-701 and VSM 97-127 Compressors)74

Gaterotor Assembly Replacement (VSM 301-701 Compressors Only)78

Gaterotor Assembly Replacement (VSM 97-127 Compressors Only)80

Gaterotor Disassembly (All Compressors Except VSM 97-127 Compressors)82

Gaterotor Disassembly (VSM 97-127 Compressors Only)85

Compressor Shaft Seal Replacement87

Slide Valve Actuator Assembly Replacement95

Slide Valve Command Shaft Assembly Replacement97

Liquid Injection Control Valve Station (Danfoss ICF 20-40 Valve Station)98

Table 5-10. Coils for Solenoid Valves (ICFE)99

Table 5-11. Parts for Motorized Valve Station (ICF)99

Main Rotor Assembly100

Table 5-12. Torque Specifications (Ft-Lbs)100

Torque Specifications100

Nord-Lock ® Washers101

Using a Torque Wrench Correctly101

Troubleshooting Guide - General Problems & Solutions108

Section 7 • Warranty and Parts111

Warranty Claim Processing111

On-Site Service Support113

Remanufactured Bare Shaft Single Screw Compressor Process113

Appendix A Torque Specifications163

Appendix B Vilter Oil165

Appendix C Vibration Measurements - Single Screw Compressor169

Appendix D Liquid Injection Valve Setup Instructions and ICM/ICAD Motorized Valve Quick Start Guide175

Brand	Emerson
Model	Vilter VSS
Category	Air Compressor
Language	English

Emerson Vilter VSS Installation, Operation And Service Manual

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