Atlas Copco Thermostat Tropical Kit Replacement – 2901350300

Atlas Copco 2901350300 – Thermostat Tropical Kit

The Atlas Copco 2901350300 (2901-3503-00) is a Thermostat Tropical Kit designed for applicable Atlas Copco oil-injected screw compressors.

The thermostat controls the temperature of the compressor oil by regulating its flow through the oil-cooling circuit. Maintaining the correct oil temperature is essential because compressor oil provides lubrication, sealing and cooling inside an oil-injected screw compressor.

This tropical thermostat kit uses an 83°C thermostatic valve, making it suitable for applicable compressor configurations operating under higher ambient-temperature conditions. Atlas Copco’s official catalog lists the kit weight as 112 g and specifies one O-ring and one 83°C thermostatic valve as the kit components.

Working Process:

During compressor operation, atmospheric air enters the compressor through the inlet system.

The screw elements compress the air, generating significant heat.

Oil is injected into the compression element. The oil absorbs compression heat while simultaneously lubricating the rotating components and sealing internal clearances.

The heated compressor oil then circulates through the oil circuit.

The thermostatic valve monitors the oil temperature through its temperature-sensitive operating element.

When the oil is relatively cool, the thermostat restricts or bypasses flow through the oil cooler. This allows the oil to reach its required operating temperature more quickly.

As the oil temperature rises toward the thermostat’s operating range, the thermostatic valve progressively changes position.

At approximately 83°C, the thermostatic valve is designed to regulate the oil flow so that an appropriate amount of oil passes through the oil cooler.

The oil cooler then removes heat from the compressor oil.

The cooled oil returns to the compressor circuit, and the cycle continues.

This automatic temperature-control process helps keep the compressor oil within its intended operating range.

Main Functions:

• Controls compressor-oil temperature.
• Regulates oil flow through the cooling circuit.
• Helps prevent excessive oil temperature.
• Helps prevent the oil from operating too cold.
• Supports proper lubrication.
• Supports effective internal cooling.
• Helps maintain correct oil viscosity.
• Supports reliable screw-element operation.
• Helps maintain stable compressor performance.

Official Product Information:

Part Number: 2901350300
Alternative Number: 2901-3503-00 / 2901 3503 00
Brand: Atlas Copco
Official Description: Thermostat Tropical Kit
Application: Oil-injected screw compressors
Thermostatic Valve: 83°C
O-Ring: 1 pc
Official Listed Weight: 112 g

Atlas Copco parts documentation also lists 2901 3503 00 as the Thermostat Tropical Kit, with an 83°C thermostat and O-ring.

Thermostat Operating Cycle:

1. Compression: The screw element compresses incoming air.
2. Heat Generation: Compression generates heat.
3. Oil Injection: Oil absorbs heat and provides lubrication and sealing.
4. Hot Oil Flow: Heated oil enters the oil-temperature-control circuit.
5. Temperature Detection: The thermostat responds to oil temperature.
6. Cold-Oil Condition: When oil temperature is low, cooler flow is restricted/bypassed.
7. Temperature Rise: As oil temperature increases, the thermostat begins opening toward the cooler circuit.
8. Approximately 83°C: The thermostatic valve regulates flow through the cooler.
9. Oil Cooling: The oil cooler removes excess heat.
10. Oil Return: Cooled oil returns to the compressor.
11. Continuous Regulation: The thermostat continuously regulates the circuit according to oil temperature.

Importance of the Thermostat:

Correct oil temperature is essential for an oil-injected screw compressor.

If the oil remains too cold, it may not reach its intended operating viscosity and can cause inefficient operation.

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

A properly functioning thermostat therefore helps maintain thermal balance.

Potential consequences of incorrect oil temperature include:

• Increased oil degradation.
• Reduced lubrication performance.
• Increased component wear.
• High oil temperature.
• Increased compressor discharge temperature.
• Excessive energy consumption.
• High-temperature alarms.
• Compressor shutdown.

Role of the 83°C Thermostatic Valve:

The thermostatic valve is the active temperature-control component of the kit.

Its temperature-sensitive element responds to oil temperature and changes the internal flow path.

At lower temperatures, the valve helps prevent unnecessary cooling.

As temperature rises, the valve opens the cooling path progressively.

This allows the oil cooler to remove increasing amounts of heat as required.

The result is automatic oil-temperature regulation without requiring continuous external adjustment.

Role of the O-Ring:

The O-ring provides leak-tight sealing between the thermostat components and the applicable housing or connection.

The O-ring is exposed to:

• Oil.
• Temperature changes.
• Pressure.
• Vibration.
• Long-term ageing.

Over time, it may harden, flatten, crack or lose elasticity.

Replacing the O-ring when installing the thermostat kit helps restore proper sealing.

Possible Failure Conditions:

The thermostat may experience:

• Internal mechanical wear.
• Sticking.
• Contamination.
• Thermostatic-element failure.
• Incorrect opening temperature.
• Restricted movement.
• Damaged O-ring.
• Incorrect installation.

Possible symptoms include:

Thermostat stuck open:

• Oil remains too cool.
• Longer warm-up time.
• Poor temperature control.
• Possible excessive oil viscosity during operation.

Thermostat stuck closed:

• Oil temperature rises excessively.
• High-temperature alarm.
• Increased oil degradation.
• Compressor thermal shutdown.
• Reduced compressor reliability.

O-ring failure:

• Oil leakage.
• Loss of sealing.
• Oil contamination around the thermostat housing.

Maintenance Procedure:

Before replacing the thermostat, shut down the compressor according to the applicable Atlas Copco service procedure.

Isolate the electrical supply.

Depressurize the compressor and allow the oil system to cool to a safe service temperature.

Locate the thermostat assembly.

Remove the applicable components carefully.

Inspect the thermostat housing and sealing surfaces for:

• Oil leakage.
• Contamination.
• Corrosion.
• Mechanical damage.
• Damaged sealing surfaces.

Remove the old thermostatic valve and O-ring.

Clean the applicable mating and sealing surfaces.

Install the 83°C thermostatic valve supplied with the 2901350300 kit.

Install the new O-ring correctly.

Ensure the O-ring is not twisted, pinched or damaged.

Reassemble the thermostat housing according to the applicable Atlas Copco service procedure.

After assembly:

1. Check for oil leakage.
2. Restart the compressor.
3. Allow the compressor to reach normal operating temperature.
4. Monitor oil temperature.
5. Confirm proper oil-cooler operation.
6. Check for abnormal temperature rise.
7. Verify that no temperature alarms occur.

Service Benefits:

Using the Atlas Copco 2901350300 Thermostat Tropical Kit during appropriate maintenance helps:

• Restore automatic oil-temperature control.
• Maintain proper oil operating temperature.
• Protect compressor lubrication.
• Improve cooling-system operation.
• Reduce excessive oil temperature.
• Reduce unnecessary cooling when the oil is cold.
• Protect the screw compression element.
• Support reliable compressor operation.
• Reduce the risk of thermal shutdown.

Technical Summary:

Part Number: 2901350300
Alternative Number: 2901-3503-00
Brand: Atlas Copco
Description: Thermostat Tropical Kit
Application: Oil-injected screw compressors
Thermostatic Valve: 83°C
Kit Components: 1 × thermostatic valve, 1 × O-ring
Official Listed Weight: 112 g
Component Type: Oil-temperature control/service kit
Primary Function: Regulates compressor-oil flow through the cooling circuit
Operating Function: Automatically controls oil temperature according to operating conditions
Main Benefits: Proper oil temperature, effective lubrication, controlled cooling and reliable compressor performance.

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