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mycom J Series - User Manual

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2205B0JE-DA-J-N_2014.05.
3–14–15 Botan Koto-ku, Tokyo 135-8482, Japan
Screw Compressor
J-Series Instruction Manual
170JS-V/170JM-V/170JL-V
220JS-V/220JM-V/220JL-V
280JS-V/280JM-V/280JL-V
CAUTION
Before operating, maintaining, or inspecting this product, read the manual thoroughly and fully
understand the contents.
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.

Table of Contents

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Preview: Operation Manual
Operation Manual20 pages

Questions and Answers

  • K
    Kelly MckeeAug 16, 2025
    What causes abnormally high pressure in my mycom J Series Air Compressor?
    • L
      levypamelaAug 16, 2025
      Abnormally high pressure in your mycom Air Compressor can be caused by a heat exchange failure at the condenser (heat exchanger). Clean and wash the heat exchangers, using solvent depending on the contamination. Other causes include malfunction of the fan motor, thermo-switch, water spray bars, cooling water pumps, etc. (identify malfunctioning devices, examine their causes, take measures, and replace malfunctioning devices), a flow volume adjustment fault for cooling water, brine, etc. (readjust manually or examine the cause and take measures if an automatic control valve is used), or poor performance in the heat exchanger (re-examine the conditions to improve if the trouble is caused by a change in operating conditions).
  • S
    Shawn DennisAug 20, 2025
    What to do if my mycom Air Compressor stops immediately after startup?
    • M
      Michele MorrisAug 20, 2025
      If your mycom Air Compressor stops immediately after startup, it could be due to the low pressure protection circuit being activated. Check for and stop any refrigerant leaks, then replenish the refrigerant, being aware of potential moisture contamination in the system. Another cause might be insufficient refrigerant circulation volume; if there are any heat exchange failures, such as poor defrost performance, investigate the cause and take corrective actions. A malfunction of the low pressure protection device, pressure sensor, relays, etc., could also be the reason. In this case, identify the malfunctioning devices, examine their causes, take appropriate measures, and then replace the faulty devices.
  • J
    James GrimesAug 31, 2025
    What causes faulty indication of capacity control position in my mycom J Series Air Compressor?
    • L
      Lisa ThomasAug 31, 2025
      Faulty indication of capacity control position in your mycom Air Compressor may arise from imprecision in the compressor indicator. Manually tighten screws to the 0% indication position of compressor capacity control. It could also be due to imprecision in the controller capacity control indicator, in which case, replace the indicator cam. Another potential cause is a malfunction in the potentiometer; if this is caused by aging degradation or prolonged partial load operation, replace the potentiometer.
  • J
    Justin MillerSep 4, 2025
    What causes capacity control malfunction in my mycom Air Compressor?
    • T
      Thomas HarrisSep 4, 2025
      Capacity control malfunction in your mycom Air Compressor can occur if 100% or 0% is undetected by the indicator; replace the micro-switch in this case. Malfunction of solenoid (modular) valves or related relays for capacity control can also cause this issue; for aging degradation, replace the parts. Internal leakage of solenoid (modular) valves for capacity control is another possibility; if caused by prolonged low load operation, improve by re-examining the operation method.
  • M
    maryhayesSep 8, 2025
    How to address abnormal vibration and/or noise in my mycom J Series Air Compressor?
    • D
      Daniel LawrenceSep 8, 2025
      Abnormal vibration or noise in your mycom Air Compressor might be due to insufficient axis adjustment with the motor side; readjust the shaft-center. Another cause could be a large runout in the Male rotor axis; if loose locknuts exist and no other fault is found in parts such as the thrust bearing, tighten the locknuts evenly. Damage to the thrust bearing can also result in abnormal vibration or noise. Note that the appropriate time for replacement will differ due to operating conditions.
  • C
    cassidybaileyNov 12, 2025
    Why is my mycom Air Compressor not starting?
    • L
      littlejefferyNov 12, 2025
      Several factors can prevent your mycom Air Compressor from starting. The power source might be off, so it is recommended to check using a check sheet, and by pointing and calling. There may be a main motor malfunction (refer to the motor instruction manual for other causes and actions), a capacity control of 0% undetected 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, check oil contamination level, and replace pipes and solenoid valves). Other potential causes include unconfirmed hydraulic pressure or cooling water circulation (identify malfunctioning devices, examine their causes, take measures, and replace malfunctioning devices), clogging in connecting pipes (re...
  • J
    jhowardNov 22, 2025
    What causes low oil-supply pressure in my mycom J Series?
    • M
      Miguel DuncanNov 23, 2025
      Low oil-supply pressure in your mycom Air Compressor can stem from several causes. There might be clogging in the oil filter element, indicated by a big difference in outlet/inlet pressures; remove the clogging, check the oil contamination level, and change the lubricant if necessary. A defect inside the compressor could also be responsible; check the oil contamination level and, after a vibration noise diagnosis, overhaul the compressor if necessary. Other potential causes include insufficient oil amount in the oil separator (inspect the oil heater and related circuit relays, replacing parts as needed), insufficient return due to insufficient refrigerant circulation (resolve the refrigerant circulation issue and return oil from the load side heat exchanger), or an extensive oil leak (insp...
  • C
    Corey WrightNov 27, 2025
    How to troubleshoot a leak from the mechanical seal of my mycom Air Compressor?
    • M
      Mark AllenNov 27, 2025
      If there's a leak from the mechanical seal of your mycom Air Compressor, it could be an initial leak after replacement until the sliding surfaces fit together. For an initial leak, the amount might increase temporarily but should gradually decrease; monitor to ensure it doesn't continuously increase. Another cause is damaged sliding surfaces due to excessive heat; if the heat load is below the device’s design conditions, re-examine operating conditions. Deteriorated parts, such as an aging O-ring, can also cause leaks, so replace the O-ring. Finally, incompatibility between operating conditions (working temperature ranges, refrigerant, etc.) and the lubricant could be the issue; re-examine operating conditions if possible, and if not, select a suitable lubricant and replace all the current...

Summary

Preface

Revision History

Records changes made to the manual over time, including revision numbers and dates.

Warranty and Disclaimer

Warranty Clauses

Outlines terms and conditions for product warranty coverage, including repair or replacement.

Disclaimer Clauses

Specifies exclusions from warranty and liability for damages or malfunctions.

Important Information

Intended Use of This Product

Describes the product's designed purpose and limitations.

Important Information for Safe Use of This Product

Provides critical safety guidelines for operating and handling the product.

About This Manual

Information regarding manual usage, copyright, and availability.

Construction of This Manual

Overview of the manual's structure and chapter contents.

1 Safety

1.1 Observation;Prevention

Safety precautions and best practices for operation and maintenance.

1.2 Warnings

Explains warning types, meanings, and safety labels.

1.3 Residual Risks

Identifies potential hazards and necessary countermeasures during operation.

1.4 Safety Devices

Details essential safety features and their functions.

2 Structure and Specifications of the Compressor

2.1 Features of the J-Series Screw Compressor

Highlights key characteristics and advantages of the J-Series compressor.

2.2 Model Designation of the Compressor

Explains the nomenclature used for compressor model identification.

2.3 Compressor Specifications

Provides technical data and parameters for the compressor models.

2.4 Structure of the Compressor

Illustrates internal components and their arrangement within the compressor.

2.5 Mechanisms

Explains the fundamental working principles of screw compressors.

2.6 Oil Flow

Illustrates the path and function of lubricating oil within the compressor.

2.7 Capacity Control Characteristics

Describes how compressor capacity is regulated and its performance curve.

2.8 Variable Vi Control

Details the variable internal volume ratio (Vi) control system.

2.9 Solenoid Valve

Provides specifications for solenoid valves used in capacity and Vi control.

3 Installation

3.1 Precautions for Installation

Essential safety and procedural guidelines before commencing installation.

3.2 Installation Work

Step-by-step procedures for unpacking, storage, transfer, and installation.

3.3 Documents Related to Installation

Lists documents pertinent to the installation process.

4 Compressor and Package Operation

4.1 Adjustment before Test Operation

Procedures for setting unloader and Vi slide valves before initial operation.

4.2 Lubricant (Refrigerant Oil)

Guidance on selecting, managing, and handling compressor lubricant oil.

4.3 Precautions for Operation

Critical operational guidelines to prevent damage and ensure safety.

4.4 Action for Stopping the Compressor for Long Period of Time

Steps to follow for safe long-term shutdown of the compressor.

5 Maintenance and Inspection

5.1 Precautions for Maintenance and Inspection

General safety guidelines and preparation steps before performing maintenance.

5.2 Maintenance List

Scheduled inspection intervals and items for ensuring compressor reliability.

5.3 Management of Lubricant

Standards and criteria for evaluating lubricant quality and condition.

5.4 Disassembly and Assembly of the Compressor

Detailed procedures for disassembling and reassembling compressor components.

6 Troubleshooting

Table 6-1 Troubleshooting

A comprehensive table listing common problems, causes, and solutions.

7 Related Documents

7.1 Development View and Configuration Table of the Parts

Detailed diagrams and part lists for compressor components.

7.2 List of Tightening Torques for Bolts and Nuts

Specifies torque values for various fasteners used in assembly.

7.3 List of Tools for Disassembly

Lists special and standard tools required for compressor maintenance.

7.4 Design Modification Notification (follow-up)

Documents design changes and updates issued for the J-series compressors.

Appendix 1 Tips for Design, Manufacturing, and Installation of the Compressor Package

Appendix 1.1 Precautions for Design of the Compressor Package

Key considerations for designing the compressor package, including limits and protection.

Appendix 1.2 Tips for Compressor Package Manufacturing

Guidance on manufacturing practices, focusing on piping and vessel cleanliness.

Appendix 1.3 Tips for Compressor Package Installation

Procedures for installing the compressor package, ensuring proper alignment and mounting.

Contact Information

How to Order MYCOM Genuine Parts

Guidance on identifying and ordering replacement parts.

Sales Offices;Service Centers

Contact details for MYCOM global sales offices and service centers.

mycom J Series Specifications

General IconGeneral
Brandmycom
ModelJ Series
CategoryAir Compressor
LanguageEnglish

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