mycom 250VMD

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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:

B
Brooke FrancisAug 10, 2025
What to do if my mycom 250VMD Air Compressor has abnormal high pressure?
- J
  johnsonjudyAug 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.
E
Erika KirkAug 14, 2025
What to do if my Mycom Air Compressor stops immediately after startup?
- R
  rpittmanAug 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.
A
alibreannaAug 19, 2025
Why does my mycom 250VMD Air Compressor have low oil-supply pressure?
- B
  Brian GrantAug 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.
E
Eric MorrisonAug 22, 2025
How to fix capacity control malfunction in my Mycom Air Compressor?
- A
  adam79Aug 22, 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.
M
Megan RichardsonAug 27, 2025
Why is my Mycom Air Compressor leaking from mechanical seal?
- B
  Brittany JosephAug 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.
M
Michael AllenAug 31, 2025
What causes faulty indication of capacity control position in my mycom 250VMD?
- J
  Jennifer RoseSep 1, 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.

mycom 250VMD Specifications

General

Brand	mycom
Model	250VMD
Category	Air Compressor
Language	English

Summary

MYCOM SCV-series Screw Compressor Instruction Manual

Warranty and Disclaimer

Warranty Clauses

Outlines the terms and conditions for product warranty coverage.

Important Information

Important Information for Safe Use

Provides crucial guidelines and precautions for safe operation and handling.

Chapter 1 Safety

ObservationPrevention

Guidelines for safe operation, maintenance, and hazard avoidance.

Prohibitions (Donts)

Lists actions and practices that must be avoided to prevent hazards.

Chapter 2 Compressor Specifications and Structure

Compressor Specifications

Provides detailed technical specifications for the SCV-series compressors.

Compressor Structure and Mechanism

Explains the internal components and operational mechanisms of the compressor.

Internal Volume Ratio Vi

Explains the concept and importance of the internal volume ratio (Vi).

Variable Vi Mechanism

Chapter 3 Installation

General Precautions for Installation

Installation Works

Transportation

Installation

Shaft Alignment

Detailed procedure for aligning the compressor and driving machine shafts.

Lubricating Oil Charge

Chapter 4 Compressor and Package Unit Operation

Adjustment of Vi

Explains how to adjust the internal volume ratio (Vi) for optimal performance.

Lubricating Oil (Refrigerant Oil)

Precautions for Operation

Chapter 5 Maintenance and Inspection

Precautions for Maintenance and Inspection

Safety precautions and general guidelines for performing maintenance and inspection.

Maintenance and Inspection List

Compressor Disassembly Preparation

Essential preparations and considerations before disassembling the compressor.

Disassembly and Inspection

Details on disassembling and inspecting specific compressor parts.

Reassembly

General precautions and procedures for reassembling the compressor.

Chapter 6 Troubleshooting

Compressor does not startup

Low oil-supply pressure

Abnormal high pressure

Abnormal vibration andor noise

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