Atlas Copco ZR450–750 Cooler Cleaning Kit Replacement – 2906049000

Atlas Copco 2906049000 – ZR450–750 Cooler Cleaning Kit

The Atlas Copco 2906049000 (2906-0490-00) Cooler Cleaning Kit is a maintenance service kit designed for compatible ZR450–750 stationary oil-free compressors. Its primary purpose is to support scheduled maintenance of the compressor’s cooler system and restore the sealing components associated with the aftercooler and intercooler assemblies.

Atlas Copco officially identifies the product as “ZR450:750 COOLER CLEANING KIT.” The kit is designed for stationary oil-free compressors and can be used for maintenance intervals of up to 16,000 operating hours. Its official listed weight is 4.66 kg.

Working Process:

During operation of an oil-free screw compressor, the compression process generates a significant amount of heat. The compressor therefore uses dedicated cooling systems to remove heat from the compressed air and maintain the machine within its intended operating temperature range.

The intercooler reduces the temperature of air between compression stages. This is important because cooling the air between stages reduces its volume and improves the efficiency of the subsequent compression stage.

After the final compression stage, the hot compressed air passes through the aftercooler. The aftercooler removes additional heat before the compressed air leaves the compressor.

The cooler assemblies operate under pressure and are exposed to temperature cycling, vibration, airflow and repeated heating and cooling. Over extended operating periods, sealing components can deteriorate.

The 2906049000 Cooler Cleaning Kit provides the service components required during cooler maintenance. Atlas Copco’s official component list includes an aftercooler kit, ZR450–750 intercooler kit, multiple O-rings, seals and Dowty sealing washers.

The official component listing includes:

• O-ring 104.5 × 3 – 1 pc
• Aftercooler Kit – 1 pc
• O-rings – 4 pcs
• O-ring – 1 pc
• O-ring 52 × 4 – 6 pcs
• Seal – 4 pcs
• ZR450–750 Intercooler Kit – 1 pc
• Dowty Seal Washer 1/4 – 1 pc
• Dowty Seal Washer 1/2+ – 3 pcs
• O-rings – 2 pcs
• Seal – 4 pcs
• O-ring – 1 pc

The O-rings and seals maintain leak-tight connections between the cooler assemblies, piping and associated compressor components.

The Dowty seal washers provide reliable sealing at applicable threaded or bolted connections and help prevent air or cooling-medium leakage.

The intercooler kit services the cooler located between compression stages. Proper intercooling helps control the temperature of air entering the next compression stage.

The aftercooler kit services the final cooling stage. Its purpose is to reduce the temperature of the final compressed air before it is delivered to downstream equipment.

As the compressor accumulates operating hours, deposits, dirt and contamination can reduce cooler heat-transfer performance. At the same time, seals and O-rings can harden, flatten, crack or lose elasticity.

If the cooler becomes restricted or contaminated, heat transfer decreases. The compressor may then operate at higher temperatures, increasing thermal stress and potentially reducing efficiency.

If an O-ring or seal fails, compressed air or cooling fluid may leak from the cooler assembly.

A leak can reduce compressor efficiency, cause pressure loss and potentially create an unsafe or contaminated operating environment.

Maintenance Procedure:

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

The cooler system should be inspected for:

• External dirt and contamination
• Internal deposits or restricted passages
• Air or fluid leakage
• Corrosion
• Damaged cooler connections
• Deteriorated O-rings and seals
• Loose or damaged sealing washers

The cooler assemblies should be cleaned according to the applicable Atlas Copco maintenance procedure.

The existing sealing components should be removed carefully without damaging the cooler’s sealing surfaces.

The 2906049000 Cooler Cleaning Kit should be used to replace the applicable O-rings, seals, Dowty washers and cooler service components.

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

Each O-ring must be installed in its correct location without twisting, cutting, overstretching or pinching.

The supplied seals and Dowty washers must be correctly positioned before the connections are tightened.

The intercooler and aftercooler assemblies must be correctly installed and securely connected.

After reassembly, the cooling circuit should be checked for leakage and proper mechanical installation.

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

Cooler performance should be checked through operating temperature, pressure, leakage and overall compressor behavior.

A properly maintained intercooler reduces the temperature of air between compression stages, while the aftercooler reduces the final compressed-air temperature.

Effective cooling helps maintain compressor efficiency, protect internal components from excessive temperature and reduce thermal stress on downstream equipment.

Using the Atlas Copco 2906049000 Cooler Cleaning Kit during the appropriate maintenance interval helps restore cooler sealing, maintain efficient heat transfer, reduce leakage and support reliable operation of ZR450–750 oil-free compressors.

Part Number: 2906049000
Alternative Number: 2906-0490-00 / 2906 0490 00
Brand: Atlas Copco
Part Description: Cooler Cleaning Kit
Official Description: ZR450–750 Cooler Cleaning Kit
Application: Atlas Copco ZR450–750 stationary oil-free compressors
Component Type: Cooler maintenance/service kit
Official Listed Weight: 4.66 kg
Maintenance Interval: Up to 16,000 operating hours
Main Components: Aftercooler kit, intercooler kit, O-rings, seals and Dowty seal washers
Primary Function: Supports cleaning and servicing of the compressor cooler system
Secondary Function: Restores sealing and cooler connection integrity
Operating Function: Maintains effective intercooling and aftercooling of compressed air
Main Benefits: Improved heat transfer, controlled compressor temperature, reduced leakage, improved cooling efficiency, protection of compressor components and reliable compressor operation.

Disclaimer: All manufacturer names, trademarks, model numbers, and part numbers are used solely for identification and compatibility purposes. Our products are high-quality aftermarket replacement products and are not manufactured, sponsored, endorsed, or authorized by the original equipment manufacturer (OEM). All trademarks remain the property of their respective owners.