Atlas Copco GA90/160W Aftercooler Kit Replacement – 2906010000

The 2906010000 Aftercooler Kit is used in the compressed-air cooling system of applicable Atlas Copco GA90/GA160W compressors. Its primary function is to reduce the temperature of compressed air after it leaves the compression stage.

During compression, the air temperature increases significantly. The hot compressed air passes through the aftercooler, where heat is transferred from the compressed air to the cooling medium. This reduces the compressed-air temperature before it enters the downstream air system.

For the GA90/160W water-cooled configuration, the kit is identified as a water-cooled aftercooler kit.

Working Process

1. Air Compression – Atmospheric air enters the compressor and is compressed by the compressor element.
2. Temperature Increase – Compression causes the air temperature to rise.
3. Hot-Air Discharge – The hot compressed air flows toward the aftercooler.
4. Cooling Medium Flow – Cooling water circulates through the cooler’s cooling passages.
5. Heat Transfer – Heat from the compressed air transfers through the cooler surfaces into the cooling water.
6. Air Temperature Reduction – The compressed air leaves the aftercooler at a substantially lower temperature.
7. Condensation Control – Cooling the compressed air can cause moisture to condense, allowing the downstream moisture-separation system to remove condensate.
8. Downstream Delivery – The cooled compressed air proceeds to the receiver or downstream air-treatment equipment.
9. Continuous Cooling – The cycle continues while the compressor is operating.

Main Functions

• Cools compressed air after compression.
• Removes excess heat from compressed air.
• Helps protect downstream pneumatic equipment.
• Supports stable compressed-air temperature.
• Helps improve air-treatment performance.
• Supports efficient compressor operation.
• Helps reduce thermal stress on downstream components.
• Assists moisture-management in the compressed-air system.

Known Application

The part is specifically listed as:

2906010000 – GA90/160W AFTERCOOLER KIT by Atlas Copco.

Parts references also associate it with GA90 and GA160W compressors.

Possible Failure Conditions

The aftercooler can lose performance because of:

• Fouling or contamination.
• Scale formation on the water side.
• Blocked cooling passages.
• Restricted water flow.
• Damaged cooler surfaces.
• Internal leakage.
• External leakage.
• Corrosion.
• Poor water quality.
• Excessive operating temperature.

Possible symptoms include:

• High compressed-air outlet temperature.
• High compressor discharge temperature.
• Excessive condensate.
• Reduced cooling performance.
• Increased thermal stress.
• Water leakage.
• Air leakage.
• Compressor temperature alarms.

Maintenance Procedure

Before servicing the aftercooler:

1. Shut down the compressor according to the Atlas Copco service procedure.
2. Isolate the electrical supply.
3. Depressurize the compressed-air system.
4. Allow hot components to cool.
5. Isolate the cooling-water supply.
6. Drain the applicable cooling circuit.
7. Inspect the aftercooler for leakage, corrosion and contamination.
8. Check cooling-water passages for restriction or scale.
9. Inspect applicable seals and connections.
10. Install the 2906010000 Aftercooler Kit as specified for the compressor.
11. Restore the cooling-water connections.
12. Restore the compressed-air circuit.
13. Restart the compressor.
14. Check air outlet temperature and cooling-water operation.
15. Inspect carefully for air or water leakage.

Service Benefits

Using the correct 2906010000 Aftercooler Kit helps:

• Restore compressed-air cooling.
• Maintain appropriate air outlet temperature.
• Improve downstream air quality.
• Reduce thermal stress.
• Protect downstream equipment.
• Support reliable compressor operation.
• Reduce the risk of temperature-related shutdowns.

Technical Summary

Recommended catalog title: Atlas Copco 2906010000 – GA90/160W Water-Cooled Aftercooler Kit, 2906-0100-00.

Compatibility note: Confirm the compressor’s exact model and serial number before ordering. Atlas Copco recommends using the machine serial number/Spare Parts Book to verify the correct part for a particular compressor.