Atlas Copco Water Cooler Kit Replacement – 2906056700

Atlas Copco 2906056700 – Water Cooler Kit

The Atlas Copco 2906056700 (2906-0567-00) is a Water Cooler Kit for Oil-Injected Screw Compressors, designed for applicable stationary oil-injected compressors, including GA VSD applications.

The water cooler is an important part of the compressor cooling circuit. During compression, considerable heat is generated. Compressor oil is injected into the compression element to provide lubrication, sealing and cooling, and the resulting heat must subsequently be removed from the oil circuit.

The water cooler transfers heat from the hot compressor oil or applicable cooling circuit to the cooling water. This helps maintain the oil and compressor at their required operating temperatures.

Atlas Copco lists this kit with an 8,000-hour service interval, a 140 g weight, and Visit Type B service classification.

Working Process:

During normal operation, the screw compressor draws atmospheric air into the compression element.

Oil is injected into the compression chamber to lubricate the rotating screw elements, seal internal clearances and absorb heat generated during compression.

The hot oil then circulates through the compressor’s oil circuit.

Before the oil is returned to the compressor element, it must be cooled to maintain the correct operating temperature.

The hot oil enters the water cooler.

Cooling water flows through the other side of the cooler.

Heat is transferred through the cooler’s heat-transfer surfaces from the hot compressor oil to the cooler water.

As heat is removed, the compressor oil temperature decreases.

The cooled oil then continues through the oil circuit and returns to the applicable compressor components.

This continuous heat-transfer process helps maintain stable oil temperature and protects the compressor from excessive thermal loading.

Main Functions:

• Supports servicing of the compressor water-cooling circuit.
• Helps remove heat from compressor oil.
• Maintains proper oil operating temperature.
• Supports efficient lubrication.
• Helps protect screw compressor components from overheating.
• Maintains stable compressor operating conditions.
• Helps restore sealing at cooler connections.
• Reduces the risk of cooling-water or oil leakage.
• Supports reliable compressor operation.

Official Product Information:

Part Number: 2906056700
Alternative Number: 2906-0567-00 / 2906 0567 00
Official Description: Kit Cooler Water for Oil Injected Screw Compressors
Used In Product: GA VSD
Product Family: Stationary Oil Injected Compressor
Service Interval: 8,000 hours
Visit Type: B
Official Listed Weight: 140 g

Official Kit Components:

Atlas Copco lists the following components for the kit:

• O-Ring – 12 pcs
• O-Ring – 4 pcs
• O-Ring 69.5 × 3 – 2 pcs
• O-Ring ID 99.5 mm – 2 pcs
• O-Ring – 2 pcs
• Ring – 3 pcs
• Gasket – 2 pcs

These sealing components are used at the applicable water-cooler connections and mating surfaces.

Water Cooler Operating Cycle:

1. Compression: Atmospheric air is compressed inside the screw element.
2. Heat Generation: Compression produces heat.
3. Oil Injection: Oil lubricates, seals and absorbs compression heat.
4. Hot Oil Circulation: Heated oil moves through the oil circuit.
5. Cooler Entry: Hot oil enters the water cooler.
6. Cooling Water Flow: Cooling water passes through the cooler.
7. Heat Transfer: Heat moves from the compressor oil to the cooling water.
8. Oil Temperature Reduction: The compressor oil is cooled.
9. Oil Return: Cooled oil returns to the compressor circuit.
10. Continuous Cycle: The process continues while the compressor is operating.

Importance of Oil Cooling:

Maintaining the correct compressor-oil temperature is essential for reliable operation.

If the oil becomes excessively hot, it can lose some of its intended cooling, lubrication and sealing performance.

Excessive oil temperature can contribute to:

• Increased oil degradation.
• Reduced lubrication performance.
• Increased component wear.
• Higher compressor operating temperature.
• Reduced cooling efficiency.
• High-temperature alarms.
• Compressor shutdown.
• Reduced service life of internal components.

The water cooler therefore plays an important role in maintaining thermal stability.

Role of O-Rings:

The O-rings supplied with the 2906056700 kit provide leak-tight sealing between applicable cooler components.

During operation, seals are exposed to:

• Compressor oil.
• Cooling water.
• Temperature changes.
• Pressure fluctuations.
• Vibration.
• Long-term ageing.

Over time, O-rings can harden, flatten, crack or lose elasticity.

Replacing the O-rings during scheduled cooler maintenance helps restore sealing performance.

Role of Gaskets:

The supplied gaskets create a sealing barrier between applicable mating surfaces.

When the connection is correctly assembled, the gasket fills small surface irregularities and helps prevent leakage.

Role of Rings:

The rings supplied in the kit support the applicable cooler assembly and sealing arrangement.

Correct installation ensures that the corresponding components remain properly positioned during operation.

Possible Failure Conditions:

The water-cooling system can experience reduced performance because of:

• Restricted cooling-water flow.
• Fouling or contamination.
• Scale formation.
• Damaged cooler surfaces.
• Corrosion.
• Deteriorated O-rings.
• Damaged gaskets.
• Incorrect assembly.
• Cooling-water leakage.
• Oil leakage.
• High cooling-water temperature.

Possible symptoms include:

• High compressor oil temperature.
• High-temperature alarm.
• Increased discharge temperature.
• Oil degradation.
• Reduced compressor efficiency.
• Cooling-water leakage.
• Oil leakage around the cooler.
• Compressor shutdown.

Similar symptoms can also originate from insufficient cooling-water flow, a blocked water circuit, temperature sensors or other cooling-system components, so proper diagnosis is required.

Maintenance Procedure:

Before servicing the water cooler, stop the compressor according to the manufacturer’s normal shutdown procedure.

Isolate the electrical supply.

Close and isolate the applicable cooling-water circuit.

Depressurize the compressor and relevant water/oil circuits.

Allow the cooler and compressor to cool to a safe working temperature.

Inspect the cooler assembly for:

• Water leakage.
• Oil leakage.
• Corrosion.
• Scale.
• Contamination.
• Damaged seals.
• Damaged gaskets.
• Mechanical damage.
• Restricted water flow.

Remove the old sealing components.

Clean the applicable mating and sealing surfaces.

Inspect the cooler for signs of internal contamination or damage.

Install the replacement O-rings, gaskets and rings supplied in the 2906056700 Water Cooler Kit.

During installation:

• Use the correct seal at each location.
• Ensure O-rings are correctly seated.
• Do not twist, cut or pinch O-rings.
• Ensure mating surfaces are clean.
• Install gaskets correctly.
• Position rings correctly.
• Reconnect the cooling-water circuit correctly.
• Tighten connections according to the applicable Atlas Copco service procedure.

After assembly, perform the required leak checks.

Restore the cooling-water supply.

Restart the compressor according to the normal operating procedure.

Allow the compressor to reach normal operating conditions.

Monitor:

• Oil temperature.
• Cooling-water flow.
• Cooling-water leakage.
• Oil leakage.
• Compressor discharge temperature.
• Pressure.
• Alarm conditions.
• Overall compressor performance.

Service Benefits:

Using the Atlas Copco 2906056700 Water Cooler Kit during appropriate scheduled maintenance helps:

• Restore cooler sealing.
• Maintain efficient heat transfer.
• Control compressor-oil temperature.
• Protect lubrication performance.
• Reduce the risk of overheating.
• Prevent oil and water leakage.
• Support reliable compressor operation.
• Maintain compressor efficiency.
• Reduce unexpected downtime.

Part Number: 2906056700
Alternative Number: 2906-0567-00
Brand: Atlas Copco
Official Description: Kit Cooler Water for Oil Injected Screw Compressors
Application: Stationary oil-injected compressors / GA VSD
Service Interval: 8,000 hours
Visit Type: B
Official Listed Weight: 140 g
Component Type: Water cooler service kit
Primary Function: Supports servicing and sealing of the compressor water cooler
Operating Function: Transfers heat from compressor oil to cooling water
Main Components: O-rings, rings and gaskets
Main Benefits: Controlled oil temperature, reliable cooling, reduced leakage and dependable compressor performance.

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