Air Top 2000 Heater Spare Parts
About the Air Top 2000 Series
The Air Top 2000 series of air heaters from Webasto is a popular range of heaters for smaller boats and camper vans. They have evolved over the years into a series of different models – from the original Air Top 2000, through the Air Top 2000S to the Air Top 2000 ST and the current model, the Air Top 2000 STC.
The general principle and operation of the heaters hasn’t changed throughout the life of the Air Top 2000 range, although the model has undergone various tweaks over the years to improve efficiency, performance and reliability.
Air Top 2000S, 2000ST & 2000STC
The Air Top 2000S, for example, has a smaller casing and diagnostic compatibility, while the Air Top 2000ST has a dual glowpin/flame sensor, a sealed ECU, and zero speed fan idle. The current model, the Air Top 2000 STC boasts the new DP42 fuel pump and W-bus compatibility.
There is a variety of different models for different markets, including marine, RV and vehicle, all programmed differently to best suit the required operation in the relevant application.
Common Replacement Parts for the Air Top 2000 Series
The heaters in the Air Top 2000 series basically consist of:
- Combustion & Heating Air Fan
- Heat Exchanger
- Burner Insert with Combustion Tube
- ECU (Electronic Control Unit)
- Flame Sensor
- Glow Plug
- Temperature Limiter
- Temperature Sensor
JPC Direct are registered agents for Webasto , and we supply a full range of these spare parts for all Webasto heaters, including the Air Top 2000 series. You can find more details on these below.
Combustion and Heating Air Fan
The combustion and heating air fan delivers the air required for combustion from the combustion air inlet to the burner insert. By means of the fan the heating air is also delivered to the air outlet.
The heat exchanger dissipates the heat provided by combustion to the air delivered by the combustion and heating air fan.
Burner Insert with combustion tube
Within the burner, fuel is distributed in the combustion tube across the burner cross-section. In the combustion tube, the combustion of the fuel/air mixture takes place, heating up the heat exchanger. Faults with the burner may be caused by coking up, low voltage, poor fuel and heavy usage.
The Control Unit (ECU)
The Control Unit (or ECU) is the central controlling unit for functional sequencing and monitoring of the combustion operation. A temperature sensor located on the side is used for the temperature control. 12 Volt heaters may have the temperature sensor replaced by an external temperature sensor. The combustion and heating air fan may be set by means of a potentiometer.
The temperature limiter protects the air heater against excessive operating temperatures. Overheat protection is activated at temperature higher than 150 degrees to interrupt the electrical circuit of the dosing pump and switch off the heater with run-down operation. After cooling down, the electrical circuit is restored, and the heater can be switched on again.
The flame sensor is the low-Ohm PTC resistor changing its resistance dependent on its heating by the flame. The signals are routed to the control unit for processing. The flame sensor monitors the flame operating condition over the complete duration of the heater operation.
The glow plug ignites the fuel/air mixture at the start of the air heater operation. The glow plug is acting as an electrical resistor and is located in the burner insert opposed to the flame side. A potential fault with the glow plug is being blocked by carbon on the burner.
The dosing pump is a combined supply, dosing and shut-off system for the fuel supply of the heater out of the vehicle’s fuel tank.
The most common faults across the entire Air Top range are voltage, and fuel starvation.