Atlas Copco IMD 260 Regeneration Cooler Kit Replacement – 2906083900

The Atlas Copco 2906083900 is a regeneration cooler service kit used in the IMD 260 dryer system. The regeneration cooler is part of the dry-air regeneration circuit and helps control the temperature of the regeneration air before/after it passes through the drying system.

In the IMD 260 drying cycle, the desiccant rotor continuously moves between the adsorption and regeneration zones. The regeneration circuit removes the moisture collected by the rotor. The regeneration cooler helps maintain the required temperature conditions for this process.

Working Process

1. Compressed-Air Drying – Moist compressed air passes through the drying section of the IMD 260.
2. Moisture Adsorption – The desiccant rotor captures moisture from the compressed air.
3. Rotor Rotation – The rotor moves continuously toward the regeneration section.
4. Regeneration Air – A controlled air stream is used to regenerate the moisture-loaded section of the rotor.
5. Cooling/Temperature Control – The regeneration cooler manages the temperature of the regeneration circuit.
6. Moisture Release – Heat and airflow remove the accumulated moisture from the desiccant.
7. Moisture Exhaust – The released moisture is discharged from the dryer system.
8. Rotor Returns to Drying Zone – The regenerated rotor section returns to the adsorption zone.
9. Continuous Cycle – The drying and regeneration process repeats continuously.

Main Functions

• Supports regeneration of the IMD 260 desiccant rotor.
• Maintains appropriate regeneration-air temperature.
• Helps remove accumulated moisture from the rotor.
• Supports consistent dryer performance.
• Helps maintain the required compressed-air dew point.
• Restores cooler sealing during maintenance.
• Reduces the risk of regeneration-system leakage.

Kit Components

The ZT/IMD 260 parts documentation identifies 2906083900 / 2906 0839 00 as the Regeneration Cooler Kit for IMD 260. The associated parts list includes replacement sealing components such as O-rings for the regeneration cooler assembly.

Possible Failure Symptoms

A damaged or poorly sealed regeneration cooler can contribute to:

• High outlet dew point.
• Poor rotor regeneration.
• Moisture carryover.
• Reduced dryer performance.
• Regeneration temperature problems.
• Air leakage.
• Increased energy consumption.
• Dryer alarms or shutdowns.

Maintenance Procedure

1. Shut down the compressor/dryer according to the applicable Atlas Copco service procedure.
2. Isolate electrical and compressed-air supplies.
3. Fully depressurize the system.
4. Allow hot components to cool.
5. Open the required IMD 260 cooler service area.
6. Inspect the regeneration cooler for contamination, corrosion or leakage.
7. Remove worn sealing components.
8. Clean the mating and sealing surfaces.
9. Install the replacement components from 2906083900.
10. Ensure O-rings are correctly positioned and not twisted.
11. Reassemble the regeneration cooler.
12. Restore the air and electrical connections.
13. Restart the system.
14. Check for leakage.
15. Verify regeneration temperature and dryer performance.
16. Confirm the outlet dew point is within the specified operating range.

Technical Summary

Recommended catalog title:
Atlas Copco 2906083900 – IMD 260 Regeneration Cooler Kit for ZT 75–90 Integrated Dryer Systems, 2906-0839-00.

Atlas Copco’s official listing confirms the part as the IMD260 Regeneration Cooler Kit, while a ZR/ZT parts list associates it specifically with the regeneration cooler for IMD 260.

Compatibility note: Verify the compressor/dryer model and serial number before ordering, particularly because IMD 260 configurations can vary by machine version.