Atlas Copco ZR110–145 Aftercooler Kit Replacement – 2906073300

The 2906073300 Aftercooler Kit is a service kit used for maintaining the aftercooler assembly on applicable Atlas Copco ZR110–145 compressors.

During compression, the temperature of compressed air rises considerably. The aftercooler removes this heat before the compressed air continues into the downstream air system. Maintaining proper aftercooler sealing and heat-transfer performance is important for maintaining the required compressed-air temperature and reliable compressor operation.

Working Process

1. Air Compression – Atmospheric air enters the compressor and is compressed by the compressor elements.
2. Heat Generation – Compression increases the temperature of the air.
3. Hot-Air Transfer – The hot compressed air flows toward the aftercooler.
4. Heat Exchange – Heat is transferred from the compressed air through the aftercooler surfaces to the cooling medium.
5. Air Cooling – The compressed air temperature is reduced.
6. Condensation – As the air cools, moisture can condense and can subsequently be handled by the downstream moisture-separation system.
7. Cooled-Air Delivery – The cooled compressed air continues toward the downstream system.
8. Continuous Operation – The cooling process continues whenever the compressor is operating.

Main Functions

• Services the ZR110–145 aftercooler assembly.
• Maintains proper aftercooler sealing.
• Helps prevent air and coolant leakage.
• Supports efficient heat transfer.
• Helps maintain appropriate compressed-air temperature.
• Supports reliable compressor operation.
• Helps reduce temperature-related operating problems.

Kit Components

A DEWA procurement document identifies 2906073300 as the ZR145 Aftercooler Kit and lists components included under the kit, including:

• Gasket Type 1 — 90 × 109 × 2
• Washer M12
• Multiple O-rings
• O-ring 114.5 × 3
• Plug 1/4 AA

The document lists the individual component part numbers alongside the kit.

Role of the Seals and O-Rings

The O-rings and gaskets provide leak-tight sealing between the aftercooler and its connected components.

They prevent unwanted leakage of the applicable air/cooling circuit and maintain pressure integrity.

Over time, sealing components can deteriorate because of:

• Temperature cycling
• Pressure fluctuations
• Ageing
• Vibration
• Contamination
• Chemical exposure
• Compression set
• Incorrect installation

Replacing these components during aftercooler servicing helps restore reliable sealing.

Possible Failure Symptoms

A deteriorated aftercooler or sealing system may result in:

• High compressed-air outlet temperature.
• Reduced cooling performance.
• Air leakage.
• Coolant leakage.
• Excessive condensate.
• Temperature alarms.
• Reduced compressor efficiency.
• Increased thermal stress.
• Compressor shutdown under high-temperature conditions.

Maintenance Procedure

Before servicing the aftercooler:

1. Shut down the compressor according to the applicable Atlas Copco procedure.
2. Isolate the electrical supply.
3. Depressurize the compressed-air system.
4. Allow hot components to cool.
5. Isolate and drain the applicable cooling circuit if required.
6. Remove the relevant aftercooler connections.
7. Inspect the cooler and sealing surfaces.
8. Remove old gaskets and O-rings.
9. Clean the mating surfaces thoroughly.
10. Install the replacement components from 2906073300.
11. Ensure O-rings are correctly seated and are not twisted or pinched.
12. Install the gasket in the correct orientation.
13. Reconnect the aftercooler according to the applicable service procedure.
14. Restore the cooling and air circuits.
15. Restart the compressor.
16. Check for air/coolant leakage.
17. Monitor compressed-air temperature and overall compressor operation.

Service Benefits

Using the 2906073300 Aftercooler Kit during appropriate maintenance helps:

• Restore aftercooler sealing.
• Maintain effective compressed-air cooling.
• Reduce leakage.
• Maintain proper operating temperature.
• Protect downstream pneumatic equipment.
• Improve compressor reliability.
• Reduce the possibility of temperature-related downtime.

Technical Summary

Recommended catalog title: Atlas Copco 2906073300 – ZR110–145 Aftercooler Service Kit, 2906-0733-00.

Compatibility note: The strongest application evidence identifies this as the ZR110–145 Aftercooler Kit, with a specific procurement listing for ZR145. Confirm the compressor model and serial number before ordering.