mycom 280J - User Manual

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2205B0JE-DA-J-N_2014.05.

3–14–15 Botan Koto-ku, Tokyo 135-8482, Japan

Screw Compressor

J-Series Instruction Manual

170JS-V/170JM-V/170JL-V

220JS-V/220JM-V/220JL-V

280JS-V/280JM-V/280JL-V

CAUTION

Before operating, maintaining, or inspecting this product, read the manual thoroughly and fully

understand the contents.

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

U
uhernandezAug 16, 2025
What causes abnormally high pressure in my mycom 280J Air Compressor?
- N
  Nancy Coleman DVMAug 16, 2025
  Abnormally high pressure in your mycom Air Compressor can be caused by a heat exchange failure at the condenser (heat exchanger). Clean and wash the heat exchangers, using solvent depending on the contamination. Other causes include malfunction of the fan motor, thermo-switch, water spray bars, cooling water pumps, etc. (identify malfunctioning devices, examine their causes, take measures, and replace malfunctioning devices), a flow volume adjustment fault for cooling water, brine, etc. (readjust manually or examine the cause and take measures if an automatic control valve is used), or poor performance in the heat exchanger (re-examine the conditions to improve if the trouble is caused by a change in operating conditions).
W
William OneillAug 19, 2025
What to do if my mycom 280J stops immediately after startup?
- A
  Anthony WallaceAug 20, 2025
  If your mycom Air Compressor stops immediately after startup, it could be due to the low pressure protection circuit being activated. Check for and stop any refrigerant leaks, then replenish the refrigerant, being aware of potential moisture contamination in the system. Another cause might be insufficient refrigerant circulation volume; if there are any heat exchange failures, such as poor defrost performance, investigate the cause and take corrective actions. A malfunction of the low pressure protection device, pressure sensor, relays, etc., could also be the reason. In this case, identify the malfunctioning devices, examine their causes, take appropriate measures, and then replace the faulty devices.
C
Christian RamseyAug 30, 2025
What causes faulty indication of capacity control position in my mycom 280J Air Compressor?
- A
  Anita GarciaAug 30, 2025
  Faulty indication of capacity control position in your mycom Air Compressor may arise from imprecision in the compressor indicator. Manually tighten screws to the 0% indication position of compressor capacity control. It could also be due to imprecision in the controller capacity control indicator, in which case, replace the indicator cam. Another potential cause is a malfunction in the potentiometer; if this is caused by aging degradation or prolonged partial load operation, replace the potentiometer.
L
Lisa HollowaySep 3, 2025
What causes capacity control malfunction in my mycom 280J Air Compressor?
- M
  Misty GreenSep 4, 2025
  Capacity control malfunction in your mycom Air Compressor can occur if 100% or 0% is undetected by the indicator; replace the micro-switch in this case. Malfunction of solenoid (modular) valves or related relays for capacity control can also cause this issue; for aging degradation, replace the parts. Internal leakage of solenoid (modular) valves for capacity control is another possibility; if caused by prolonged low load operation, improve by re-examining the operation method.
J
jerry85Sep 7, 2025
How to address abnormal vibration and/or noise in my mycom 280J Air Compressor?
- H
  houselindsaySep 7, 2025
  Abnormal vibration or noise in your mycom Air Compressor might be due to insufficient axis adjustment with the motor side; readjust the shaft-center. Another cause could be a large runout in the Male rotor axis; if loose locknuts exist and no other fault is found in parts such as the thrust bearing, tighten the locknuts evenly. Damage to the thrust bearing can also result in abnormal vibration or noise. Note that the appropriate time for replacement will differ due to operating conditions.
J
Jason ShermanNov 11, 2025
Why is my mycom Air Compressor not starting?
- C
  Curtis SimmonsNov 11, 2025
  Several factors can prevent your mycom Air Compressor from starting. The power source might be off, so it is recommended to check using a check sheet, and by pointing and calling. There may be a main motor malfunction (refer to the motor instruction manual for other causes and actions), a capacity control of 0% undetected 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, check oil contamination level, and replace pipes and solenoid valves). Other potential causes include unconfirmed hydraulic pressure or cooling water circulation (identify malfunctioning devices, examine their causes, take measures, and replace malfunctioning devices), clogging in connecting pipes (re...
J
Jacqueline DanielsNov 22, 2025
What causes low oil-supply pressure in my mycom 280J?
- J
  James SmithNov 22, 2025
  Low oil-supply pressure in your mycom Air Compressor can stem from several causes. There might be clogging in the oil filter element, indicated by a big difference in outlet/inlet pressures; remove the clogging, check the oil contamination level, and change the lubricant if necessary. A defect inside the compressor could also be responsible; check the oil contamination level and, after a vibration noise diagnosis, overhaul the compressor if necessary. Other potential causes include insufficient oil amount in the oil separator (inspect the oil heater and related circuit relays, replacing parts as needed), insufficient return due to insufficient refrigerant circulation (resolve the refrigerant circulation issue and return oil from the load side heat exchanger), or an extensive oil leak (insp...
B
Billy JenkinsNov 26, 2025
How to troubleshoot a leak from the mechanical seal of my mycom Air Compressor?
- M
  Melinda CraigNov 26, 2025
  If there's a leak from the mechanical seal of your mycom Air Compressor, it could be an initial leak after replacement until the sliding surfaces fit together. For an initial leak, the amount might increase temporarily but should gradually decrease; monitor to ensure it doesn't continuously increase. Another cause is damaged sliding surfaces due to excessive heat; if the heat load is below the device’s design conditions, re-examine operating conditions. Deteriorated parts, such as an aging O-ring, can also cause leaks, so replace the O-ring. Finally, incompatibility between operating conditions (working temperature ranges, refrigerant, etc.) and the lubricant could be the issue; re-examine operating conditions if possible, and if not, select a suitable lubricant and replace all the current...

mycom 280J Specifications

General

Brand	mycom
Model	280J
Category	Air Compressor
Language	English

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