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mycom 250VSD - User Manual

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2205Q2JE-HO-S6-N_2020.01.
SCV-series
Screw Compressor
Instruction Manual
160VLD／160VMD／160VSD
200VLD／200VMD／200VSD
250VLLD／250VLD／250VMD／250VSD
320VLD／320VMD／320VSD
160VLG／160VMG／160VSG
200VLG／200VMG／200VSG
250VLLG／250VLG／250VLG／250VSG
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.

Table of Contents

Questions and Answers

  • J
    John Jackson MDAug 10, 2025
    What to do if my mycom 250VSD has abnormal high pressure?
    • T
      Thomas CastroAug 10, 2025
      If your Mycom Air Compressor is experiencing abnormally high pressure, it could be due to a few reasons. Check for heat exchange failure at the condenser (heat exchanger) and clean it, using a solvent if needed. Also, look for malfunctions in the fan motor, thermo-switch, water spray bars, or cooling water pumps, addressing any issues and replacing faulty components. If the heat exchanger capacity is insufficient, consider re-evaluating operating conditions or improving the installation environment. If these adjustments are difficult, adding more or larger heat exchangers might be necessary.
  • J
    Jessica Jackson DVMAug 14, 2025
    What to do if my Mycom Air Compressor stops immediately after startup?
    • S
      Sherri CarlsonAug 14, 2025
      If your Mycom Air Compressor stops immediately after starting, it could be due to the low pressure protection circuit being activated. Check for insufficient refrigerant, identify and repair any leaks, and then recharge the refrigerant, being cautious of moisture contamination. Another possible cause is a malfunction in the pressure regulating valve operation, in which case you should replace the valve or address the underlying cause. It could also be due to a malfunction of the low pressure protection device, pressure sensor, or relays; identify and replace any malfunctioning devices.
  • H
    hreedAug 19, 2025
    Why does my mycom 250VSD Air Compressor have low oil-supply pressure?
    • M
      Mrs. Cheryl HigginsAug 19, 2025
      If your Mycom Air Compressor has low oil-supply pressure, there could be several reasons. Check for clogging in the oil filter element, indicated by a big difference in outlet/inlet pressures; remove any clogging and replace the lubricant if necessary. A defect inside the compressor could also be the cause; check the oil contamination level and overhaul the compressor if needed after vibration noise diagnosis. Insufficient oil in the oil separator can also lead to this issue; inspect the oil heater and related circuit relays, replacing parts as needed. Finally, check for extensive oil leaks in the machine room and around the compressor, and inspect for oil in the cooling water system, addressing any leaks found in the oil cooler heat exchanger tube.
  • A
    Andrea GardnerAug 23, 2025
    How to fix capacity control malfunction in my mycom 250VSD?
    • K
      Kara PattersonAug 23, 2025
      A capacity control malfunction in your Mycom Air Compressor can stem from a few causes. If the indicator isn't detecting 100% or 0%, replace the micro-switch. For malfunctions of unloader solenoid valves or related relays, replace parts affected by aging or address water leakage and replace the compromised components. Internal leakage of the unloader solenoid valves can also be a factor, particularly after prolonged low load operation; improve this by re-examining the operation method.
  • S
    Scott RobinsonAug 27, 2025
    Why is my mycom 250VSD Air Compressor leaking from mechanical seal?
    • S
      Sheila StrongAug 27, 2025
      A leak from the mechanical seal on your Mycom Air Compressor can occur for several reasons. An initial leak after replacement is common until the seal and shaft surfaces mate; ensure the leak doesn't continuously increase. Deteriorated parts, such as O-rings, should be replaced due to aging degradation. Incompatibility between operating conditions (temperature, refrigerant) and lubricant can also cause leaks; re-examine operating conditions, and if necessary, re-select the lubricant, replacing all of the existing lubricant with the new type.
  • S
    Seth SmithAug 31, 2025
    What causes faulty indication of capacity control position in my mycom 250VSD Air Compressor?
    • A
      Andrea BrownAug 31, 2025
      A faulty indication of the capacity control position on your Mycom Air Compressor can be due to a few reasons. If the compressor indicator is imprecise, manually tighten the screws to the 0% indication position of the compressor capacity control. If the controller capacity control indicator is imprecise, replace the indicator cam. A malfunction in the potentiometer, often due to aging or prolonged partial load operation, requires replacing the potentiometer.
  • T
    Terry ThomasNov 5, 2025
    Why my mycom 250VSD does not startup?
    • D
      debragarciaNov 5, 2025
      If the Mycom Air Compressor isn't starting, several issues could be the cause. First, ensure the power source is active; using a checklist after inspection can prevent oversights. If the main motor is faulty, consult its instruction manual for troubleshooting. Other potential causes include undetected 0% capacity control (replace the micro-switch), a hydraulic circuit defect (readjust), leaks or clogs in pipes and solenoid valves (remove obstructions and check for oil contamination, replacing oil if needed), unconfirmed hydraulic pressure or cooling water circulation (identify and replace malfunctioning devices), clogs in connecting pipes or circulation routes (remove clogs), malfunctioning magnets or relays in the start circuit (replace them), or a bad installation environment (improve te...

Summary

Warranty and Disclaimer

Warranty Clauses

Outlines the terms and conditions under which the product is covered against defects.

Disclaimer Clauses (Exclusion of Warranty Clauses)

Specifies conditions and situations that are not covered by the product warranty.

Important Information

Important Information for Safe Use of This Product

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

Chapter 1 Safety

1.1 Observation and Prevention

Covers essential safety rules, do's, and don'ts for operation and maintenance.

1.2 Warnings

1.3 Residual Risks

1.4 Safety Devices

Describes essential safety devices and their functions for compressor protection.

Chapter 2 Compressor Specifications and Structure

2.3 Compressor Specifications

2.4 Compressor Structure and Mechanism

Chapter 3 Installation

3.1 General Precautions for Installation

3.2 Installation Works

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

Chapter 4 Compressor and Package Unit Operation

4.1 Adjustment of Vi

4.2 Lubricating Oil (Refrigerant Oil)

4.3 Precautions for Operation

Chapter 5 Maintenance and Inspection

5.1 Precautions for Maintenance and Inspection

Covers essential safety precautions and general guidelines before performing maintenance.

5.2 Maintenance and Inspection List

5.3 Compressor Disassembly Preparation

5.4 Disassembly and Inspection

Explains the procedures for disassembling and inspecting various compressor components.

5.5 Reassembly

Guides the user through the process of reassembling the compressor after inspection or repair.

mycom 250VSD Specifications

General IconGeneral
Brandmycom
Model250VSD
CategoryAir Compressor
LanguageEnglish

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