1. Produktua amaitu daview
The Webasto Air Top EVO 40 is a compact and powerful 4kW diesel air heater designed for recreational vehicles (RVs) and other vehicle applications. This unit provides efficient and quiet heating, ensuring comfort in various conditions. It features improved fuel economy and is part of the latest generation of Webasto air heaters, offering a comprehensive solution for vehicle heating needs.

1.1. irudia: Osatua Webasto Air Top EVO 40 Diesel Air Heater RV Vehicle Kit. This image displays the main heater unit, various pipes, wiring harnesses, fuel pump, and mounting hardware included in the kit.
2. Segurtasun informazioa
Please read and understand all safety instructions before installing, operating, or maintaining the Webasto Air Top EVO 40 heater. Failure to follow these instructions may result in property damage, serious injury, or death.
- Instalazio profesionala: Installation should only be performed by qualified personnel or an authorized Webasto service center. Incorrect installation can lead to dangerous situations.
- Erregaiaren Manipulazioa: Diesel fuel is flammable. Exercise extreme caution when handling fuel. Ensure adequate ventilation and extinguish all open flames or ignition sources.
- Exhaust Fumes: The heater produces exhaust fumes containing carbon monoxide, which is odorless and deadly. Ensure the exhaust system is properly sealed and vented to the outside, away from any air intakes.
- Konexio elektrikoak: Disconnect the vehicle's battery before performing any electrical work. Ensure all electrical connections are secure and properly insulated to prevent short circuits.
- Aireztapena: Ensure proper air circulation around the heater unit to prevent overheating. Do not block air inlets or outlets.
- Mantentzea: Regular maintenance is crucial for safe operation. Refer to the maintenance section for details.
3. Components and Internal Structure
The Webasto Air Top EVO 40 kit includes the main heater unit, fuel pump, wiring harness, exhaust pipe, intake pipe, and various mounting accessories. Understanding the internal components is key to its function.

3.1. irudia: Zeharkako sekzioa view ren Webasto Air Top EVO 40 air heating system. Key components shown include the heater housing, control unit, impellers for combustion and hot air blowers, glow plug, tubular combustion chamber, heat exchanger, fuel pump, and various sensors and outlets.

3.2. irudia: Webasto control dial, used for adjusting the heater's temperature output. The dial features a clear indicator for temperature settings and the Webasto logotipoa.
4. Konfigurazioa eta instalazioa
The Webasto Air Top EVO 40 is designed for a comprehensive installation. Due to the complexity and safety requirements, it is highly recommended that installation be carried out by a certified professional or an authorized Webasto service technician. The kit includes all necessary components for a complete setup.
4.1 General Installation Considerations
- Lekua: Choose a mounting location that allows for proper air circulation, access for maintenance, and safe routing of fuel lines, exhaust, and electrical wiring.
- Erregai-hornidura: Connect the fuel pump and fuel line to the vehicle's diesel tank or a dedicated auxiliary tank. Ensure all connections are leak-free.
- Ihes-sistema: Route the exhaust pipe safely away from the vehicle's interior and any combustible materials. Ensure the exhaust outlet is clear of obstructions.
- Air Ducts: Install the hot air ducts to distribute heat effectively within the vehicle. Ensure cold air intake is unobstructed.
- Sistema elektrikoa: Connect the heater to a 12V power source, ensuring proper fusing and wiring according to the provided wiring diagram.

Figure 4.1: Diagram illustrating the typical installation of a Webasto air heater in a van. This shows the heater unit, air intake, hot air distribution, and exhaust routing within the vehicle chassis.

Figure 4.2: Diagram depicting the installation of a Webasto heater in heavy equipment. This illustrates how the heater can be integrated to provide cabin heating in industrial or construction machinery.
5. Funtzionamendu-argibideak
The Webasto Air Top EVO 40 is designed for user-friendly operation, primarily controlled via the included dial thermostat.
5.1 Berogailua martxan jartzea
- Ensure the vehicle battery is adequately charged and there is sufficient diesel fuel in the tank.
- Turn the control dial clockwise from the "0" position to the desired temperature setting.
- The heater will initiate its start-up sequence, which includes a self-test, glow plug activation, and fuel pump priming. This process may take a few minutes.
- Once combustion is stable, warm air will begin to flow from the outlets.
5.2 Tenperatura doitzea
Rotate the control dial to increase or decrease the desired temperature. The heater will automatically adjust its output to maintain the set temperature.
5.3 Berogailua itzaltzea
- Turn the control dial counter-clockwise to the "0" position.
- The heater will enter a cool-down phase, during which the fan will continue to run to dissipate residual heat. Do not disconnect power during this phase.
- Once the cool-down cycle is complete, the heater will shut off completely.
6. Mantentzea
Mantentze-lan erregularrak zure iraupena eta funtzionamendu segurua bermatzen ditu Webasto Air Top EVO 40 heater. It is recommended to have the heater inspected by a qualified technician annually.
- Garbiketa orokorra: Keep the heater unit clean and free from dust and debris. Ensure air inlets and outlets are not obstructed.
- Ihes-sistema: Periodically check the exhaust pipe for any damage, corrosion, or blockages. Ensure all connections are secure.
- Erregai-sistema: Inspect fuel lines for leaks or damage. Ensure the fuel filter (if installed) is clean.
- Konexio elektrikoak: Egiaztatu konexio elektriko guztiak estuak direla eta korrosiorik gabe daudela.
- Funtzionamenduaren egiaztapena: Regularly test the heater's operation, ensuring it starts, heats, and shuts down correctly.
7. Arazoak
This section provides guidance for common issues. For complex problems, contact an authorized Webasto service center.
| Arazoa | Kausa posiblea | Irtenbidea |
|---|---|---|
| Berogailua ez da martxan jartzen. | Bateria bolumen baxuatage, no fuel, clogged fuel line, electrical fault. | Check battery charge. Ensure fuel tank is not empty. Inspect fuel lines and filter. Check fuses and wiring. |
| Heater starts but shuts down quickly. | Overheating, insufficient air supply, exhaust blockage, fuel supply issue. | Ensure air inlets/outlets are clear. Check exhaust for blockages. Verify fuel flow. |
| Berokuntza errendimendu eskasa. | Incorrect temperature setting, air duct leaks, low fuel quality. | Adjust temperature. Inspect air ducts for leaks. Use recommended diesel fuel. |
| Ezohiko zarata funtzionamenduan. | Loose components, fan obstruction, worn bearings. | Inspect for loose parts. Check for foreign objects in fan. Contact service if noise persists. |
| Issues at high elevation. | Heater not compensating for altitude. | Some units may require specific altitude compensation settings or controllers. Consult Webasto documentation or a technician for altitude-specific adjustments. |
8. Zehaztapenak
-ren zehaztapen tekniko nagusiak Webasto Air Top EVO 40 heater.

Figure 8.1: Technical data table providing detailed specifications for Webasto Air Top EVO 40 and EVO 55 models, including heat flow, fuel consumption, rated voltage, bolumen operatiboatage, permissible ambient temperatures, and dimensions.
| Zehaztapena | Value (Air Top EVO 40) |
|---|---|
| Heat flow over control range | 1.7 to 3.5 (4.0) kW |
| Erregaia | Diesel / biodiesel DIN EN 590 / DIN EN 14214 |
| Fuel consumption over control range | 0.18 to 0.36 (0.41) kg/h |
| Balorazioko boltage | 12 V |
| Bolumen eragileatagbarrutia | 10.5 eta 16 V |
| Permissible ambient temperature (operation/storage) | -40 to +40 / -40 to +85 °C |
| Berogailuaren luzera | 423 ± 2 mm |
| Heater width | 148 ± 1 mm |
| Heater height | 162 ± 1 mm |
| Heater weight | 5.9 kg |
| IP class: Heater | IP5K4K |
| Elementuaren pisua (paketea) | 23.2 kilo |
| Paketearen neurriak | 21.5 x 15.4 x 9.1 hazbete |
9. Bermea eta Laguntza
For warranty information, technical support, or to locate an authorized service center, please refer to the official Webast website or contact your point of purchase. Always ensure that any service or repair work is carried out by qualified and authorized personnel to maintain warranty validity and ensure safe operation.
Laguntza gehiago behar baduzu, bisitatu Webasto official webgunea.





