Atlas Copco ZR300–425 Intercooler Kit Replacement – 2906044600

Atlas Copco 2906044600 – ZR300–425 Intercooler Kit

The Atlas Copco 2906044600 (2906-0446-00) is a ZR300–425 Intercooler Kit designed for compatible ZR/ZT oil-free compressors.

The intercooler is installed between compression stages and removes heat from the compressed air before it enters the next compression stage. The kit provides the replacement sealing and associated components required when servicing, cleaning, inspecting or overhauling the intercooler assembly.

Atlas Copco’s official catalog lists the kit weight as approximately 1.27 kg.

Working Process:

During operation, atmospheric air enters the oil-free compressor and is compressed in the first compression stage.

Compression causes the air temperature to rise significantly.

The hot compressed air then enters the intercooler.

The intercooler transfers heat from the compressed air to the applicable cooling medium. As heat is removed, the temperature of the compressed air decreases.

The cooled air then enters the next compression stage.

Cooling the air between compression stages is important because lower inlet temperature to the next stage supports efficient compression and helps control the overall compressor operating temperature.

After the intercooler is serviced using the 2906044600 kit, the replacement seals and associated components restore the sealing integrity of the intercooler assembly.

This helps prevent leakage and supports reliable heat-transfer performance.

Main Functions:

• Supports servicing of the ZR300–425 intercooler.
• Removes heat from compressed air between compression stages.
• Reduces interstage air temperature.
• Helps maintain proper compressor operating temperature.
• Supports efficient second-stage compression.
• Restores sealing at intercooler connections.
• Helps prevent compressed-air and cooling-medium leakage.
• Supports reliable oil-free compressor operation.

Official Kit Components:

Atlas Copco’s official product page lists the following components:

• Pin – 1 pc
• O-ring – 2 pcs
• Seal – 1 pc
• O-ring – 3 pcs
• O-ring – 1 pc
• Ring – 2 pcs
• Plug 1/4 A A – 2 pcs
• O-ring – 1 pc
• O-ring – 2 pcs
• Seal Washer Dowty 1/4 – 2 pcs

The complete kit weighs approximately 1.27 kg.

Intercooler Operating Cycle:

1. Air Intake: Atmospheric air enters the compressor.
2. First-Stage Compression: The first compression element increases air pressure and temperature.
3. Hot-Air Transfer: Hot compressed air flows toward the intercooler.
4. Intercooler Entry: The compressed air enters the intercooler.
5. Heat Transfer: Heat moves from the compressed air to the cooling medium.
6. Temperature Reduction: The compressed-air temperature decreases.
7. Second-Stage Entry: Cooled compressed air enters the next compression stage.
8. Further Compression: The second stage increases the pressure to the required level.
9. Continuous Operation: The intercooling process continues while the compressor operates.

Importance of the Intercooler:

Intercooling is important because compression naturally increases air temperature.

If the intercooler becomes contaminated, restricted or damaged, its heat-transfer efficiency can decrease.

Possible consequences include:

• Increased interstage temperature.
• Higher second-stage inlet temperature.
• Reduced compression efficiency.
• Increased thermal stress.
• Higher energy consumption.
• High-temperature alarms.
• Reduced compressor reliability.
• Possible compressor shutdown.

Maintaining the intercooler in good condition helps keep the compression stages within their intended operating temperature range.

Role of the O-Rings and Seals:

The O-rings and seal supplied with the kit provide leak-tight sealing between the applicable intercooler components.

During long-term operation, sealing elements can experience:

• Hardening
• Compression set
• Loss of elasticity
• Cracking
• Thermal ageing
• Surface damage

Replacing the seals during intercooler maintenance helps restore the sealing integrity of the assembly.

Role of Rings and Pin:

The rings and pin support the correct mechanical positioning and assembly of the applicable intercooler components.

Correct positioning is important to ensure that the serviced assembly remains mechanically secure and operates as intended.

Role of Dowty Seal Washers:

The two Dowty 1/4 seal washers provide sealing at applicable threaded connections.

They combine a metal support section with an elastomer sealing element to create a reliable seal when the connection is correctly tightened.

Role of Plugs:

The two 1/4 A A plugs close the designated openings in the intercooler assembly.

Correct installation helps prevent leakage and maintains the integrity of the applicable circuit.

Possible Failure Conditions:

Intercooler performance may deteriorate because of:

• Dust or contamination.
• Fouling of heat-transfer surfaces.
• Restricted cooling-medium flow.
• Corrosion.
• Mechanical damage.
• Damaged O-rings.
• Deteriorated seals.
• Incorrect assembly.
• Leakage.
• Thermal cycling.

Possible symptoms include:

• High interstage temperature.
• Reduced cooling performance.
• Increased compressor temperature.
• Air leakage.
• Cooling-medium leakage.
• High-temperature alarms.
• Increased energy consumption.
• Reduced compressor performance.

These symptoms can also be caused by cooling-system restrictions, fans, sensors, valves or other components, so proper diagnosis is required.

Maintenance Procedure:

Before servicing the intercooler, stop the compressor according to the normal shutdown procedure.

Isolate the electrical supply and applicable pneumatic/cooling energy sources.

Depressurize the relevant circuits and allow the intercooler to cool to a safe service temperature.

Inspect the intercooler for:

• Dirt accumulation.
• Blocked passages.
• Corrosion.
• Leakage.
• Damaged seals.
• Damaged connections.
• Mechanical damage.
• Reduced heat-transfer performance.

Remove the existing service components carefully.

Clean the mating and sealing surfaces.

Install the replacement components from the 2906044600 Intercooler Kit.

During assembly:

• Select the correct O-ring for each location.
• Ensure O-rings are correctly seated.
• Do not twist or damage the O-rings.
• Install the seal in its correct position.
• Install the rings and pin correctly.
• Install the Dowty washers correctly.
• Install the plugs in their designated locations.
• Keep all cooling and air passages clean.
• Secure connections according to the applicable Atlas Copco service procedure.

After assembly, perform the applicable leak and functional checks.

Restart the compressor and allow it to reach normal operating conditions.

Monitor:

• First-stage discharge temperature.
• Interstage temperature.
• Second-stage inlet temperature.
• Cooling-medium flow.
• Compressor pressure.
• Air leakage.
• Cooling-medium leakage.
• Overall compressor stability.

Service Benefits:

Using the Atlas Copco 2906044600 Intercooler Kit during appropriate maintenance helps:

• Restore intercooler sealing.
• Maintain effective heat transfer.
• Reduce interstage air temperature.
• Support efficient second-stage compression.
• Reduce thermal stress.
• Prevent leakage.
• Protect compressor components.
• Maintain reliable oil-free compressor operation.
• Reduce the risk of unexpected downtime.

Part Number: 2906044600
Alternative Number: 2906-0446-00 / 2906 0446 00
Brand: Atlas Copco
Official Description: ZR300–425 Intercooler Kit
Application: ZR/ZT300–425 oil-free compressors
Official Listed Weight: 1.27 kg
Component Type: Intercooler service/maintenance kit
Primary Function: Supports servicing and sealing of the intercooler assembly
Operating Function: Removes heat from compressed air between compression stages
Main Components: Pin, seals, O-rings, rings, plugs and Dowty seal washers
Main Benefits: Effective interstage cooling, reliable sealing, controlled operating temperature and dependable compressor performance.

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