mycom UD Series

2200X2JE-MY-S2-N_2020.09.
UD-series
Screw Compressor
Instruction Manual
CAUTION
Read this manual carefully and thoroughly before operating, maintaining or inspecting this
product. It is important to fully comprehend the contents of this manual. Keep the operation
manual in a safe, designated place for future reference whenever the need arises.
Specifications of this product are subject to change without prior notice.
125SUD/125LUD
160SUD/160MUD/160LUD
200SUD/200MUD/200LUD
250SUD/250MUD/250LUD
320SUD/320MUD/320LUD/320LLUD
400SUD/400MUD/400LUD/400LLUD/
400XLUD

mycom UD Series Specifications

General

Brand	mycom
Model	UD Series
Category	Air Compressor
Language	English

Summary

Preface

Revision History

Details changes made to the manual over time and their dates.

Manual Structure Overview

Outlines the structure and content of the manual's chapters.

Warranty and Disclaimer

Warranty Terms and Conditions

Explains the terms and conditions of the product warranty provided by MAYEKAWA.

Warranty Exclusions

Lists incidents for which MAYEKAWA disclaims responsibility for malfunctions or damages.

Important Information

Intended Product Use

Specifies the intended application of the screw compressor for freezing and refrigeration.

Safe Product Operation Guidelines

Provides crucial safety guidelines for operating and maintaining the compressor safely.

About This Manual

Provides information about the manual's content, copyright, and handling instructions.

Chapter 1 Safety

Safety Practices and Prevention

Covers essential safety practices, including do's and don'ts for operation and maintenance.

Warning Information and Labels

Explains warning types, meanings, and the use of safety labels on the compressor.

Residual Risks and Safety Devices

Identifies hazards and outlines countermeasures, including the function of safety devices.

Specific Safety Device Procedures

Details procedures for emergency stop buttons, power isolation, and compressor protection devices.

Chapter 2 Compressor Specifications and Structure

UD-series Compressor Features

Highlights the key features of the UD-series screw compressors, including efficiency and reliability.

Compressor Model Designation and Specifications

Explains model nomenclature, standard specifications, and operational limits for compressor models.

Compressor Structure and Mechanisms

Explains the internal structure, working principles, and key components like bearings and seals.

Internal Volume Ratio (Vi) Explained

Explains the concept of internal volume ratio (Vi) and its importance in compressor efficiency.

Capacity Control and Oil Supply

Details the capacity control mechanism and the different types of oil supply systems.

Chapter 3 Installation

General Installation Precautions

Provides essential precautions and considerations before installing the compressor onto a package unit.

Installation Works and Preparations

Details procedures for unpacking, storage, transportation, site preparation, and connecting ports.

Chapter 4 Compressor and Package Unit Operation

Lubricating Oil Management

Details on selecting, managing, and handling lubricating oil for optimal compressor performance and longevity.

Operational Precautions

Critical operational precautions to ensure safe and efficient performance, avoiding issues like liquid flow-back and purging gases.

Long-Term Compressor Stoppage Procedures

Steps to follow for proper shutdown and periodic checks when the compressor is stopped for extended periods.

Chapter 5 Maintenance and Inspection

Maintenance and Inspection Safety

Essential safety precautions and general guidelines to follow before and during maintenance and inspection activities.

Inspection Checklists and Guidelines

Provides structured lists for daily, periodic inspections, and overhaul frequency guidelines.

Compressor Disassembly Preparations

Outlines necessary preparations, tools, and workplace considerations before disassembling the compressor for overhaul.

Compressor Component Disassembly

Details procedures for disassembling and inspecting major compressor components like unloader, seals, bearings, and rotors.

Chapter 6 Troubleshooting

Compressor Start-up and Operation Issues

Troubleshoots common issues like failure to start, stopping after startup, and abnormal pressure readings.

Oil Pressure, Temperature, and Seal Issues

Addresses problems related to low oil pressure, high discharge temperature, and mechanical seal leaks.

Capacity Control and VibrationNoise Issues

Diagnoses and resolves capacity control malfunctions, abnormal vibration, and noise problems.

Chapter 7 Related Documents

Exploded, Sectional, and Assembly Views

Illustrates compressor parts and assembly through detailed diagrams.

Parts Configuration Tables

Lists part numbers, descriptions, and quantities for various UD-series compressor models.

Maintenance Data and Specifications

Provides key maintenance data including clearances, seals, torque, lock nuts, and O-rings.

Tools Required for Disassembly

Lists essential tools required for disassembling the compressor, including their illustrations and code numbers.