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mycom 320MUD - 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

  • M
    miguelandersenAug 9, 2025
    Why does my mycom Air Compressor stop immediately after startup?
    • J
      John HuffmanAug 10, 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.
  • E
    ericaprinceAug 14, 2025
    What causes abnormal vibration and/or noise in my mycom 320MUD?
    • C
      Christopher OrtizAug 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.
  • T
    Travis SparksAug 31, 2025
    What causes capacity control malfunction in my mycom Air Compressor?
    • J
      jesusbarkerAug 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.
  • B
    brucecolleenNov 4, 2025
    What to do if my mycom 320MUD does not start up?
    • V
      Valerie DeleonNov 4, 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...
  • J
    Jeffery MillerNov 17, 2025
    What to do if there is abnormal high pressure (abnormal discharge pressure) in my mycom Air Compressor?
    • J
      Julie QuinnNov 18, 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...
  • D
    Donald JonesNov 21, 2025
    Why is there low oil-supply pressure in my mycom Air Compressor?
    • A
      Alexis MorrisonNov 21, 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...
  • F
    Frank AndersonNov 26, 2025
    What causes a faulty indication of capacity control position in mycom 320MUD Air Compressor?
    • H
      Hector MillerNov 26, 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

Important Information

Important Information for Safe Use of This Product

Provides critical safety guidelines for operating and maintaining the product.

Chapter 1 Safety

1.4 Safety Devices

Explains the function and inspection of essential safety devices.

Chapter 2 Compressor Specifications and Structure

2.3 Compressor Specifications

Provides detailed technical specifications for various compressor models.

2.4 Compressor Structure and Mechanism

Details the internal components, working principles, and mechanisms of the compressor.

Chapter 3 Installation

3.1 General Installation Precautions

Covers essential preliminary steps and considerations before compressor installation.

3.2 Installation Works

Outlines the procedures for unpacking, storage, transportation, and installation.

3.2.5 Installation

Covers placement and crucial shaft alignment procedures for installation.

Chapter 4 Compressor and Package Unit Operation

4.1 Lubricating Oil (Refrigerant Oil)

Discusses selection, handling, and control criteria for lubricating oil.

4.2 Precautions for Operation

Provides vital operational advice, including flow-back prevention and gas purging.

Chapter 5 Maintenance and Inspection

5.1 Precautions for Maintenance and Inspection

5.2 Maintenance and Inspection List

5.3 Compressor Disassembly Preparation

5.4 Disassembly and Inspection

5.5 Reassembly

Chapter 6 Troubleshooting

Table 6-1 Troubleshooting

Lists common problems, their direct causes, factors, and recommended actions.

Chapter 7 Related Documents

mycom 320MUD Specifications

General IconGeneral
Brandmycom
Model320MUD
CategoryAir Compressor
LanguageEnglish

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