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mycom 250SUD - 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
    maryjonesAug 10, 2025
    Why does my mycom 250SUD stop immediately after startup?
    • R
      Rebecca LeonAug 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.
  • J
    Joseph WoodsAug 13, 2025
    What causes abnormal vibration and/or noise in my mycom 250SUD?
    • C
      chopkinsAug 13, 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.
  • C
    cheryl16Aug 31, 2025
    What causes capacity control malfunction in my mycom 250SUD Air Compressor?
    • J
      Jose PhamAug 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.
  • E
    Eugene ClarkNov 4, 2025
    What to do if my mycom 250SUD does not start up?
    • P
      Patricia JohnsonNov 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...
  • D
    David MendozaNov 17, 2025
    What to do if there is abnormal high pressure (abnormal discharge pressure) in my mycom 250SUD Air Compressor?
    • J
      Jessica WelchNov 17, 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...
  • T
    Tanner RodriguezNov 21, 2025
    Why is there low oil-supply pressure in my mycom 250SUD Air Compressor?
    • J
      John HensleyNov 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...
  • E
    Evan PalmerNov 26, 2025
    What causes a faulty indication of capacity control position in mycom 250SUD Air Compressor?
    • P
      Paul SchneiderNov 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

Warranty and Disclaimer

Important Information

Important Information for Safe Use of This Product

Provides essential guidelines and precautions for the safe operation and handling of the product.

Chapter 1 Safety

1.1 Observation;Prevention

Covers general precautions, do's, and don'ts for safe operation and maintenance.

1.2 Warnings

Explains the types and meanings of warning symbols and labels used in the manual and on the product.

1.3 Residual Risks

Identifies potential hazards and necessary safety measures during operation, inspection, and maintenance.

1.4 Safety Devices

Details various safety devices incorporated into the compressor and their functions for protection.

Chapter 2 Compressor Specifications and Structure

2.3 Compressor Specifications

Provides detailed technical specifications for various compressor models.

2.3.1 Standard Specifications

Lists the standard operational data and performance metrics for the compressor series.

2.3.2 Operation Limits

Defines the safe operating parameters and boundaries for the compressor.

Chapter 3 Installation

3.1 General Installation Precautions

Provides essential safety and procedural guidelines before commencing compressor installation.

3.2 Installation Works

Details the specific steps and procedures involved in installing the compressor unit.

3.2.3 Transportation

Covers safe procedures for transporting the compressor, including lifting and handling.

3.2.4 Preparation for Installation

Outlines necessary preparations like installation space, illumination, and ventilation.

3.2.5 Installation

Details the actual process of installing the compressor, including shaft alignment.

3.2.8 Lubricating Oil Charge

3.2.9 Charge of Refrigerant

Chapter 4 Compressor and Package Unit Operation

4.1 Lubricating Oil (Refrigerant Oil)

Covers the selection, management, and properties of lubricating oil for the compressor.

4.1.1 Precautions for Selecting the Lubricating Oil

Provides critical advice on choosing the correct type of lubricating oil based on system requirements.

4.2 Precautions for Operation

Covers essential precautions to be taken during compressor operation.

4.2.1 Prevention of Liquid Flow-back Operation

Chapter 5 Maintenance and Inspection

5.1 Precautions for Maintenance and Inspection

Outlines critical safety precautions before performing any maintenance or inspection tasks.

5.2 Maintenance and Inspection List

Provides a comprehensive list of items and intervals for routine maintenance and inspection.

5.2.1 Daily Management

5.2.2 Periodic Inspection

5.2.3 Guidelines for Compressor Overhaul Frequency

5.3 Compressor Disassembly Preparation

Covers the essential steps and tools needed before disassembling the compressor for overhaul.

5.3.1 Disassembly Tools and Workplace

5.3.2 Replacement Parts

Identifies parts recommended for replacement during compressor overhauling.

5.3.3 Refrigerant Gas Recovery

5.3.4 Removal of Connections to the Unit

5.3.5 Removal of the Compressor from Base Frame

5.3.6 Compressor Disassembly Order

Outlines the recommended sequence for disassembling compressor components.

5.4 Disassembly and Inspection

Detailed procedures for disassembling and inspecting specific compressor parts.

5.4.12 Rotor and Rotor Casing

Explains the disassembly and inspection of the compressor rotors and casing.

5.5 Reassembly

Procedures for reassembling the compressor components after maintenance or overhaul.

5.5.3 Rotor

Details the reassembly process for the compressor rotors.

Chapter 6 Troubleshooting

01 Compressor does not start up

Provides troubleshooting steps for when the compressor fails to start.

02 Compressor stops immediately after startup

Offers solutions for issues where the compressor shuts down shortly after starting.

03 Abnormally low pressure

04 Low oil-supply pressure

Addresses problems related to insufficient oil supply pressure to the compressor.

05 Abnormal high pressure

Troubleshooting steps for abnormal high pressure (discharge) in the compressor.

06 Abnormally high discharge temperature

Provides solutions for excessively high discharge temperatures in the compressor.

07 Leak from mechanical seal

10 Capacity control malfunction

11 Abnormal vibration and;or noise of compressor

Troubleshooting guide for excessive vibration or noise generated by the compressor.

mycom 250SUD Specifications

General IconGeneral
Power2.2 kW
Maximum Pressure8 bar
Tank Capacity50 L
PhaseSingle
Weight50 kg

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