mycom 320LUD 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:

D
Drew HunterAug 9, 2025
Why does my mycom 320LUD stop immediately after startup?
- D
  daisy66Aug 9, 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.
T
Teresa Werner MDAug 14, 2025
What causes abnormal vibration and/or noise in my mycom Air Compressor?
- B
  Brian GarciaAug 14, 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.
J
Jessica HolmesAug 31, 2025
What causes capacity control malfunction in my mycom 320LUD?
- M
  Matthew RussellAug 31, 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.

mycom 320LUD Specifications

General

Brand	mycom
Model	320LUD
Category	Air Compressor
Language	English

Summary

Chapter 1 Safety

Safety Devices

Describes essential safety devices like emergency stop buttons and protective mechanisms.

Chapter 2 Compressor Specifications and Structure

Compressor Structure and Mechanism

Chapter 3 Installation

General Installation Precautions

Provides essential safety and procedural guidelines to be followed before installing the compressor.

Installation Works: Preparation and Procedure

Details preparation steps, installation sequence, vacuuming, oil, and refrigerant charging procedures.

Installation Works Overview

Chapter 4 Compressor and Package Unit Operation

Lubricating Oil Management

Guidance on selecting, handling, and controlling lubricating oil for optimal compressor operation.

Operational Precautions

Highlights essential safety measures and procedures for operating the compressor, including flow-back prevention.

Chapter 5 Maintenance and Inspection

Maintenance and Inspection Precautions

Critical safety guidelines and general precautions to be observed before performing maintenance or inspection tasks.

Maintenance and Inspection Schedule

Covers daily, periodic, and overhaul inspection schedules and guidelines.

Periodic and Overhaul Inspection Guidelines

Compressor Disassembly Preparation

Covers preparation steps for disassembly, including tools, workplace, and replacement parts.

Disassembly Procedures and Safety

Details refrigerant recovery, connection removal, compressor removal, and disassembly order.

Detailed Component Disassembly and Inspection

Reassembly Procedures: Valves, Bearings, and Rotors

Chapter 6 Troubleshooting

Compressor Start-up and Operation Issues

Troubleshooting steps for compressor start failures and immediate post-startup stops.

Pressure and Oil Supply Troubleshooting

Addresses issues related to abnormal pressure readings and low oil supply pressure.

High Pressure and Temperature Troubleshooting

Guidance for diagnosing and resolving abnormal high discharge pressure and temperature issues.

Seal Leaks and Temperature-Related Issues

Troubleshooting for mechanical seal leaks and causes of high discharge temperature.

Seal Squeaking and Capacity Indication Faults

Capacity Control Malfunctions

Troubleshooting guide for diagnosing and resolving issues with the compressor's capacity control system.

Vibration and Noise Troubleshooting

Guidance for identifying and resolving abnormal vibration and noise issues in the compressor.

Vibration and Noise Troubleshooting: Causes

Further troubleshooting for vibration and noise, including oil hammer and liquid flow-back.

Vibration and Noise Troubleshooting: System Factors

Addresses vibration and noise related to expansion valves, heat exchangers, and foreign substances.

Vibration and Noise Troubleshooting: Assembly and Stress

Troubleshooting for vibration caused by assembly issues, thrust stress, and fastener tightness.

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