Webasto AT 2000 STC Diesel 12V Air Heater Instruction Manual

1. Introduction

This manual provides essential information for the safe and efficient installation, operation, and maintenance of your Webasto Air Top 2000 STC diesel air heater. Please read these instructions carefully before beginning installation or operation to ensure proper function and safety.

The Webasto Air Top 2000 STC is a compact and economical air heater designed to provide comfortable warmth in vehicle interiors or cargo spaces. It features optimized fuel efficiency, various operation modes, and robust safety standards. The heater quickly and quietly warms the air and maintains a constant temperature. Users can select between recirculation and fresh-air modes.

2. Safety Information

WARNING: Failure to follow these safety instructions could result in fire, explosion, electric shock, or other injuries.

• Ensure the heater is installed by qualified personnel according to all local and national regulations.
• Do not operate the heater in enclosed spaces without adequate ventilation, especially where flammable vapors or dust may be present.
• Always use the specified fuel type (diesel) and voltage (12V).
• Keep flammable materials away from the heater's exhaust and air intake.
• Regularly inspect fuel lines, electrical connections, and exhaust system for damage or leaks.
• Never block the air intake or outlet openings of the heater.
• Disconnect power before performing any maintenance or repair work.

3. Package Contents

Verify that all components are present in your installation kit. The complete set typically includes:

• Webasto Air Top 2000 STC Heater Unit
• Electronic Timer/Control Panel
• Fuel Pump
• Fuel Standpipe
• Fuel Filter
• Wiring Harnesses
• Exhaust Pipe
• Combustion Air Intake Pipe
• Ducting for Heated Air
• Mounting Plate
• Air Outlet Grille
• Clamps, Fasteners, and Small Parts

Image: Overview of the Webasto AT 2000 STC Diesel Air Heater full installation kit, showing the main heater unit, control panel, fuel pump, wiring, exhaust, air ducting, and various mounting hardware.

4. Setup and Installation

Installation of the Webasto Air Top 2000 STC requires careful attention to detail and adherence to safety guidelines. It is recommended that installation be performed by a certified technician.

4.1 Mounting the Heater Unit

Select a suitable, secure location for the heater unit, ensuring adequate clearance for air intake, exhaust, and maintenance access. The mounting surface must be flat and robust.

Image: The mounting plate for the Webasto AT 2000 STC heater, showing pre-drilled holes for secure attachment.

4.2 Fuel System Connection

Install the fuel standpipe into the vehicle's fuel tank. Connect the fuel filter and fuel pump in line with the standpipe and the heater unit. Ensure all fuel connections are tight and leak-free.

Image: The fuel standpipe, designed to draw diesel fuel from the vehicle's tank for the heater.

Image: The inline fuel filter, used to protect the fuel pump and heater from contaminants.

4.3 Exhaust and Air Ducting

Route the exhaust pipe safely away from flammable materials and passenger compartments. Install the combustion air intake pipe and connect the heated air ducting to distribute warm air effectively within the space.

4.4 Electrical Connections

Connect the wiring harness to the heater unit, fuel pump, and control panel. Ensure all electrical connections are secure and correctly polarized. Connect the main power supply to a 12V source, ensuring proper fusing.

5. Operating Instructions

The Webasto Air Top 2000 STC is controlled via an electronic timer/control panel, allowing for precise temperature management and operational modes.

Image: The electronic control panel for the Webasto AT 2000 STC, displaying features such as digital thermometer adjustment, quick start, heating and ventilation modes, 12V/24V compatibility, 24/7 active forward planning, and fault monitoring.

5.1 Starting the Heater

1. Ensure the vehicle's battery has sufficient charge and there is adequate fuel in the tank.
2. Press the power button on the control panel. The heater will initiate a startup sequence, including a self-test.
3. Once running, the heater will begin to warm the air.

5.2 Adjusting Temperature and Mode

• Use the rotary knob or buttons on the control panel to set the desired temperature. The heater will automatically adjust its output to maintain this setting.
• Select between heating mode and ventilation mode (fan-only operation) as needed.
• The control panel allows for digital thermometer adjustment and 24/7 active forward planning for scheduled operation.

5.3 Shutting Down the Heater

Press the power button on the control panel to turn off the heater. The unit will undergo a cool-down cycle before completely shutting down. Do not disconnect power during the cool-down cycle.

6. Maintenance

Regular maintenance ensures the longevity and efficient operation of your Webasto Air Top 2000 STC heater.

• Annual Inspection: Have the heater inspected annually by a qualified technician. This includes checking the combustion air fan, fuel pump, and electrical connections.
• Fuel Filter: Inspect and replace the fuel filter periodically, especially if you notice reduced performance or fuel delivery issues.
• Air Ducts and Grilles: Keep air intake and outlet grilles clear of obstructions. Clean air ducts as needed to ensure unrestricted airflow.
• Exhaust System: Check the exhaust pipe for any damage, corrosion, or blockages. Ensure it is securely fastened.
• Electrical Connections: Verify that all electrical connections are clean, tight, and free from corrosion.

7. Troubleshooting

The control panel includes fault monitoring capabilities. If an issue arises, the display may show an error code. Refer to the full service manual for specific error code interpretations.

Common Issues:

• Heater Fails to Start:
  • Check battery voltage.
  • Ensure sufficient fuel in the tank.
  • Verify all electrical connections are secure.
  • Check for blockages in the fuel line or exhaust.
• Reduced Heat Output:
  • Check for obstructions in air intake or outlet.
  • Inspect fuel filter for clogging.
  • Ensure proper voltage supply.
• Unusual Noise:
  • Inspect the fan for foreign objects.
  • Check mounting for secure attachment.

For persistent issues or complex repairs, contact Webasto customer support or a certified service center.

8. Specifications

9. Warranty Information

The Webasto Air Top 2000 STC Diesel Air Heater comes with a 2-year warranty. This warranty covers defects in materials and workmanship under normal use and service.

Image: A badge indicating a 2-year warranty for the product.

Please retain your proof of purchase for warranty claims. For detailed terms and conditions, refer to the warranty card included with your product or contact Webasto customer service.

10. Customer Support

For technical assistance, spare parts, or service inquiries, please contact your authorized Webasto dealer or visit the official Webasto website. When contacting support, please have your product model number (AT 2000 STC) and serial number ready.

You can find additional resources and contact information on the Webasto official website.