Table of Contents
UD-series Screw Compressors
vi
Table of Contents
Preface
........................................................................................................................ i
Revision history..................................................................................................... i
Warranty and Disclaimer ........................................................................................... ii
Warranty Clauses................................................................................................. ii
Disclaimer Clauses (Exclusion of Warranty Clauses) ........................................... ii
Important Information ............................................................................................... iii
Intended Use of this Product ............................................................................... iii
Important information for Safe Use of this Product .............................................. iii
About this Manual ............................................................................................... iv
Construction of this Manual ................................................................................. iv
Table of Contents ...................................................................................................... vi
Chapter 1 Safety
1.1 Observation/Prevention ............................................................................. 1-1
1.1.1
Observance (Do’s) .............................................................................................. 1-1
1.1.2
Prohibitions (Don’ts) ........................................................................................... 1-3
1.2 Warnings ..................................................................................................... 1-4
1.2.1
Types and Meanings of Warnings ...................................................................... 1-4
1.2.2
Safety labels ....................................................................................................... 1-4
1.3 Residual Risks ............................................................................................ 1-6
1.4 Safety Devices ............................................................................................ 1-9
1.4.1
Emergency Stop Button ...................................................................................... 1-9
1.4.2
Breakers for the Main Motor Power and Control Power ..................................... 1-9
1.4.3
Compressor Protection Devices ....................................................................... 1-10
Chapter 2 Compressor Specifications and Structure
2.1 Features of UD-series Screw Compressors ............................................. 2-1
2.2 Model Designation of the Compressor ..................................................... 2-2
2.3 Compressor Specifications ....................................................................... 2-4
2.3.1
Standard Specifications ...................................................................................... 2-4
2.3.2
Operation Limits .................................................................................................. 2-5
2.3.3
Outer Dimensions and Weight ............................................................................ 2-7
2.4 Compressor Structure and Mechanism .................................................. 2-10
2.4.1
Overview of UD-series Screw Compressor ...................................................... 2-10
2.4.2
Refrigerant Gas Compression Mechanism ....................................................... 2-11
2.4.3
Internal Volume Ratio Vi ................................................................................... 2-13
2.4.4
Bearings and Balance Piston............................................................................ 2-17
