Atlas Copco Aftercooler Kit ZR450–750 Replacement – 2906048900

Atlas Copco 2906048900 – Aftercooler Kit ZR450–750

The Atlas Copco 2906048900 (2906-0489-00) Aftercooler Kit is a service and replacement kit designed for compatible ZR450–750 oil-free compressors. Its primary function is to maintain the aftercooler assembly’s sealing, connection integrity and heat-transfer performance after the compression process.

Working Process:

During operation of an oil-free compressor, the compression process raises the temperature of the compressed air significantly. Before the compressed air is delivered to downstream equipment, it passes through the aftercooler.

The aftercooler transfers heat from the hot compressed air to the cooling medium. This reduces the compressed-air temperature and allows moisture generated during cooling to be separated from the air stream.

Effective aftercooling is important because excessively hot compressed air can increase the thermal load on downstream equipment and reduce the effectiveness of the compressed-air treatment system.

The 2906048900 Aftercooler Kit provides service components required to restore the sealing and connection condition of the aftercooler assembly.

Atlas Copco’s official catalog lists the kit for oil-free compressors and specifies a weight of 3.06 kg. The official component list includes O-rings, seals, plugs, rings, seal washers, Dowty seal washer and gaskets.

The kit includes:

• O-ring – 1 pc
• O-ring 366.3 × 5.7 – 1 pc
• Plug G 1/2 – 1 pc
• Seal – 1 pc
• O-rings – multiple pcs
• Ring – 2 pcs
• Plug 1 1/2 A A – 2 pcs
• O-rings – 2 pcs
• Seal Washer – 2 pcs
• O-rings – 2 pcs
• Dowty Seal Washer 1/2+ – 1 pc
• Gasket – 2 pcs
• Additional O-rings – 2 pcs

The O-rings, seals and gaskets provide airtight and leak-resistant connections between the aftercooler and associated piping or components.

The plugs and rings maintain the mechanical integrity of the cooler connections and close designated ports.

The seal washers and Dowty seal washer provide additional sealing around threaded or bolted connections where conventional O-rings may not be used.

During normal operation, the aftercooler assembly experiences high compressed-air temperature, pressure fluctuations, vibration, thermal expansion and contraction, and repeated compressor operating cycles.

Over time, sealing components can harden, flatten, crack or lose elasticity. Thermal cycling can also affect gaskets and sealing surfaces.

A damaged O-ring or gasket can cause compressed-air leakage. Such leakage can reduce system efficiency and may prevent the compressor from maintaining the intended pressure.

A damaged plug seal or sealing washer can also produce external leakage and may allow contaminants to enter the system.

If the aftercooler itself becomes contaminated or restricted, heat-transfer performance can decrease. This can result in higher discharge-air temperatures and increased thermal stress on downstream components.

The service kit allows the affected sealing and connection components to be renewed during scheduled aftercooler maintenance.

Maintenance Procedure:

Before servicing the aftercooler, the compressor must be stopped, electrically isolated, completely depressurized and allowed to cool according to the applicable Atlas Copco safety procedure.

The aftercooler should be inspected for external contamination, corrosion, leakage, damaged connections, blocked passages and signs of thermal or mechanical stress.

The existing O-rings, seals, gaskets and sealing washers should be removed carefully without damaging the mating surfaces.

The components supplied with the 2906048900 Aftercooler Kit should be installed in their specified locations.

All sealing surfaces must be clean, dry where required, and free from dirt, old sealing material, corrosion and foreign particles.

O-rings must be installed without twisting, cutting, overstretching or pinching.

Gaskets and seal washers must be correctly positioned before the connections are tightened.

Plugs must be installed in the correct ports and tightened according to the applicable Atlas Copco service specifications.

After assembly, all aftercooler connections should be inspected for correct installation and mechanical security.

The compressor should then be restarted and monitored during unloaded and loaded operation.

The aftercooler should be checked for compressed-air leakage, abnormal vibration and temperature abnormalities.

Correct aftercooler operation reduces compressed-air temperature after compression and helps protect downstream equipment and maintain stable compressor performance.

Using the Atlas Copco 2906048900 Aftercooler Kit during appropriate maintenance helps restore sealing performance, prevent compressed-air leakage, maintain reliable aftercooler operation and support efficient oil-free compressor performance.

Part Number: 2906048900
Alternative Number: 2906-0489-00 / 2906 0489 00
Brand: Atlas Copco
Part Description: Aftercooler Kit
Official Description: Aftercooler Kit for Oil-Free Compressors
Specific Application: ZR450–750 oil-free compressors
Component Type: Aftercooler service/replacement kit
Official Listed Weight: 3.06 kg
Main Components: O-rings, seals, gaskets, plugs, rings, seal washers and Dowty seal washer
Primary Function: Maintains the sealing and connection integrity of the aftercooler assembly
Secondary Function: Supports reliable cooling of compressed air after compression
Operating Function: Allows the aftercooler to transfer heat from compressed air while maintaining leak-free connections
Main Benefits: Reduced air leakage, reliable cooling, controlled discharge-air temperature, protection of downstream equipment and improved compressor reliability.

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