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mycom UD Series - User Manual

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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

Table of Contents

Questions and Answers

  • Z
    zmartinAug 6, 2025
    Why does my mycom Air Compressor stop immediately after startup?
    • K
      Kimberly CrawfordAug 6, 2025
      Your mycom Air Compressor might stop immediately after startup due to a few reasons. It could be that the low pressure protection circuit has been activated, indicating insufficient refrigerant. In this case, check the system, stop any leaks, and recharge the refrigerant, being cautious about moisture contamination. Another cause could be a malfunction in the pressure regulating valve operation, requiring you to replace the valve or remove the cause. Also, consider the possibility of a malfunction in the low pressure protection device, pressure sensor, or relays, where you'll need to identify the malfunctioning devices, examine their causes, take measures, and then replace them. Lastly, motor overload could be the issue; refer to the motor instruction manual for guidance.
  • J
    jeffrey87Aug 10, 2025
    What causes abnormal vibration and/or noise in my mycom UD?
    • D
      deborah07Aug 10, 2025
      Abnormal vibration or noise in your mycom Air Compressor can stem from several issues. Check for insufficient alignment between the compressor shaft and motor shaft, and realign the shaft-center if needed. Another cause could be a large axial runout of the male rotor; if loose locknuts are found and no other fault exists in parts like the thrust bearing, tighten the locknuts evenly. Also, inspect for a loose thrust bearing and replace it if defective. Finally, consider imprecision in the dynamic balance of the rotors, which would require overhauling and inspecting the compressor where rotor dynamic balance measurement and adjustment is feasible.
  • S
    Samantha JonesAug 27, 2025
    What causes capacity control malfunction in my mycom Air Compressor?
    • S
      seth54Aug 27, 2025
      Capacity control malfunction in your mycom Air Compressor can be attributed to a few potential causes. It could be due to undetected 100% or 0% by the indicator, in which case you should replace the micro-switch. Another cause may be a malfunction of the unloader solenoid valves or related relays for capacity control; for aging degradation, replace the parts. Internal leakage of the unloader solenoid valves for capacity control can also lead to malfunction; if caused by prolonged low load operation, improve by re-examining the operation method.
  • B
    Benjamin KellyOct 31, 2025
    What to do if my mycom UD does not start up?
    • M
      Michael JohnsonOct 31, 2025
      If your mycom Air Compressor doesn't start, several factors could be at play. It could be due to the power source being off, so ensure to check the check sheet after inspection to prevent oversight. Other potential causes include a main motor malfunction (refer to the motor instruction manual), undetected capacity control of 0% by the unloader indicator (replace the micro-switch), a capacity control hydraulic circuit defect (readjust), leaks or clogging in pipes and solenoid valves (remove factors and check oil contamination, replacing oil if needed), unconfirmed hydraulic pressure or cooling water circulation (identify malfunctioning devices, examine causes, take measures, and replace devices), clogging in connecting pipes (remove clogging and check oil contamination, replacing oil if nee...
  • T
    tbellNov 13, 2025
    What to do if there is abnormal high pressure (abnormal discharge pressure) in my mycom UD Air Compressor?
    • J
      James RiveraNov 13, 2025
      If your mycom Air Compressor is experiencing abnormal high pressure, it could be due to several reasons: heat exchange failure at the condenser (clean and wash them, using solvent depending on contamination), malfunction of fan motor, thermo-switch, water spray bars, cooling water pumps, etc. (identify malfunctioning devices, examine their causes, take measures, and replace them), flow volume adjustment failure of cooling water, brine, etc. (readjust manually adjusted regulating valves or examine and address the cause if using an automatic control valve), other causes of insufficient circulation volume of cooling water, etc. (inspect for clogging and contamination of filters for circulation route filters, and take measures as needed), shortage in the capacity of the heat exchanger (re-exam...
  • J
    Joe GibbsNov 18, 2025
    Why is there low oil-supply pressure in my mycom Air Compressor?
    • A
      austinmichaelNov 18, 2025
      Low oil-supply pressure in your mycom Air Compressor may be attributed to a few potential issues. It could be due to clogging in the oil filter element, indicated by a big difference in outlet/inlet pressures; in this case, remove the clogging, check the oil contamination level, and change the lubricant as necessary. Another cause might be a defect inside the compressor; check the oil contamination level and, after a vibration noise diagnosis, overhaul the compressor if needed. Insufficient oil amount in the oil separator could also be the culprit; inspect the oil heater, relays, and related circuits, and replace parts as needed. Additionally, consider insufficient oil return caused by insufficient refrigerant circulation (resolve the insufficient volume of refrigerant circulation, and the...
  • H
    harriskimNov 22, 2025
    What causes a faulty indication of capacity control position in mycom UD Air Compressor?
    • M
      Martha SanchezNov 22, 2025
      A faulty indication of capacity control position in your mycom Air Compressor could arise from several factors. It may be due to imprecision in the compressor indicator (manually tighten screws to the 0% indication position of compressor capacity control), imprecision in the controller capacity control indicator (replace the indicator cam), a worn guide pin (dowel pin) of the compressor push rod (replace the dowel pin), malfunction in the potentiometer (replace the potentiometer if caused by aging degradation or prolonged partial load operation), maladjustment of zero point and span adjustment for the E/E positioner (readjust it), malfunction of the E/E positioner or its indicator (replace the E/E positioner for aging degradation), or loose terminals or faulty wiring (tighten loose termina...

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 Vibration;Noise 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.

mycom UD Series Specifications

General IconGeneral
Brandmycom
ModelUD Series
CategoryAir Compressor
LanguageEnglish

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