Simple Operation
Simple Operation
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A diesel heater operates on a dual-isolated airflow principle, where fuel combustion and cabin heating happen in two entirely separate, sealed systems. This design ensures that heat is safely transferred without allowing any toxic exhaust fumes or carbon monoxide to enter the living space. The heater relies on two distinct air paths moving through a central core:
The Combustion Circuit (Sealed System): Cold air is drawn from outside through an intake pipe into a sealed combustion chamber. Fuel is ignited here, and the toxic by-product gases are forced straight out of the exhaust pipe to the exterior of the vehicle or structure.
The Heating Circuit (Open System): A main fan draws cold air from inside the cabin, forces it over the intensely hot outer metal cooling fins of the heat exchanger, and blows the fresh, warm air right back into the room.
Step-by-Step Operating Sequence
The operation of a diesel heater is managed automatically by an Electronic Control Unit (ECU) across several key phases:
Startup and Preheating
When turned on, an internal electric glow plug activates to preheat the combustion chamber. During these initial minutes, the heater draws a substantial amount of electrical current (typically 10–15 Amps at 12V) to get the plug red-hot. At the same time, the internal fan spins slowly to establish airflow.
Fuel Ignition
Once the chamber reaches the correct temperature, a 12V metering pulse pump begins drawing diesel from the fuel tank. The pump pushes the fuel through a fine screen (atomiser screen), turning the liquid diesel into a fine mist inside the chamber.
Continuous Heat Cycle
With the fire established, the process becomes self-sustaining. The fuel pump continues its rhythmic "clicking" to supply fuel, while the fan spins rapidly to push cold cabin air past the heated outer chamber walls. The temperature is regulated by adjusting the frequency of the fuel pump pulses and the speed of the fan.
Controlled Shutdown
When you turn the heater off, it does not stop immediately. The fuel pump shuts off instantly to extinguish the flame, but the fan continues running at a high speed for several minutes. This critical cool-down cycle safely dissipates residual heat from the metal heat exchanger, preventing the outer plastic casing from melting or warping.
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