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REFRIGERATION DIVISION

V SERIES

SCREW COMPRESSOR HANDLING MANUAL

Supersedes all previous version. This information is for reference use only and subject to change without notice

Revision 2 (June 05,2000) Page 12 of 61

Main Page

Contents2
General Description of MYCOM V-Series Screw Compressor3
Introduction3
Refrigerant Compression Mechanism4
Screw Compressor Cross Sectional View4
Rotor Rotation & the Compression Cycle4
Suction Phase5
Compression Phase5
Discharge Phase5
Explanation of VI (Internal Volumetric Ratio)6
Reasons for Adjusting VI6
Variable VI Mechanism7
Internal Volume Ratio7
Relationship between Design and Operating Conditions7
Conventional Screw Capacity Curve8
External Adjustment of VI9
VI Changing Rod Adjustment by Model11
Precautions When Changing VI11
VI Changing Procedures12
Other Component Mechanisms13
Oil Flow14
Schematic Diagram of Lubrication System14
Exploded View of V-Series Screw Compressor15
Parts List16
Longitudinal Assembly Drawing18
External Dimensions19
Table of Dimensions20
Disassembly of V-Series21
Preparations for Disassembly21
Hand Tool Kit (Ref. Last Page)21
Removing Compressor21
Raising and Removing Compressor22
Disassembly Sequence22
Lifting the Compressor22
Lower Cover Bolt22
Mechanical Seal (100)23
Exploded View of Mechanical Seal (100)23
Cross Section of Mechanical Seal23
Component Parts of Mechanical Seal Assembly23
Seal Cover Portion24
Removing Seal Cover (51)24
Shaft Seal Cover (51)24
Loosening Seal Collar Set Screws24
A Oil Seal Sleeve25
B Shaft Seal Assembly25
Unloader Indicator25
Removing Unloader Indicator Assembly25
Removing Indicator Cover26
Loosening Micro-Switch Set Plate Screws26
Removing Micro-Switch Assembly26
Removing Unloader Cover Bolts26
Unloader Piston (64) and Unloader Cylinder27
Cylinder Cam Mounting Portion27
Unloader Indicator Cam Shaft Portion27
Piston Lock Nut (69)27
Blind Cover (22)28
Checking Unloader Piston Cap Seal28
Push Rod and O-Ring28
Balance Piston and Balance Piston Sleeve29
Exploded View of Balance Piston29
Removing Stop Ring29
Pulling out Balance Piston29
Screwing in Position Detent Pin30
After Screwing in Positioning Detent Pin30
Balance Piston Sleeve Set Screw Portion30
Bearing Cover31
Removing Bearing Cover Bolts31
Changing Rod Section31
O-Ring for VI Changing Rod31
Thrust Bearing32
Bearing Gland Bolt and Lock Washer32
After Thrust Bearing Gland Removed32
Drawing out Thrust Bearing33
Set of Thrust Bearing (L Side Lies on R Side)33
Stamps on Thrust Bearing Gland33
Thrust Bearing Portion of Models 160V**~200V**33
Suction Cover and Side Bearing34
O-Ring Gland35
Rotors35
Pulling out Rotors35
Pulling out M Rotor36
Removing Lock Washer Bolt36
Pulling out Variable VI Slide Valve Changing Rod36
Pulling out Unloader Slide Valve36
Bearing Head and Main Bearing37
Bearing Positioning Spring Pin38
Fitting Bearing38
Applying Oil to Gasket38
Unloader Slide Valve and Portion39
Mounting Unloader Slide Valve39
Mounting Variable VI Slide Valve39
Mounting Bearing Head and Rotor Casing39
Fitting VI Slide Valve Lock Washer40
Rotor Casing and Rotors40
Suction Cover40
Stamp Marks on Lobe Edges40
Positioning Side Bearing41
O-Ring Retainer41
Fitting Suction Cover41
Suction Cover Assembled41
Thrust Bearing Mounting Side42
Mounting Order of Thrust Bearing42
Mounting Direction42
Spacer42
Tightening Thrust Bearing Tightening Washer43
A Measuring End Clearance43
End Clearance (Discharge Side)43
Adjusting End Clearance44
Second Method44
When the End Clearance Is Smaller than the Specified Value44
Determining Axial Deflection45
VI Changing Rod and Thrust Washer45
Full View of Bearing Cover46
Unloader Cylinder and Blind Cover47
Unloader Cylinder47
Unloader Cover47
Mounting Unloader Cover48
Exploded View of Unloader Cover48
Mechanical Shaft Seal48
O-Ring48
Mounting Carbon Insert49
Seal Cover49
Plug for Model 160V** Seal Collar49
Disassembly and Adjustment of Unloader Indicator50
System with Two Micro-Switches50
No-Load Cam Adjustment53
Adjustment of Potentiometer at No-Load Position54
Groove in Micro-Switch Cam54
Potentiometer Shaft54
Potentiometer54
Standards of Components55
End Clearance55
Mechanical Seat Assemblies by Compressor Model55
Bolt Sizes55
Bolt Fastening Torque56
Thrust Bearing Gland Fastening Bolt Torque56
Lock Nut56
Lock Nut Fastening Torque56
Stop Rings57
O-Ring List57
Compressor Oil58
Selection of Compressor Oil58
Changing Compressor Oil Brands58
Gasket List59
Usability Limits of V-Series Screw Compressors60
Theoretical Displacement60
Connecting Port Diameters60
Hand Tool Kit61

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