PAGE 6
Circuit Interfaces IMAGE 4
The following circuit interfaces can be found on the controller outer case: X1 for glow plug/flame sensor socket,
X2 for overheating sensor socket, X3 for fan motor socket. Please refer to IMAGE 4 for their locations
Sensors and safety protection
Flame sensor / glow plug
This component has dual functions, when it works as the flame sensor it can monitor the temperature of the furnace cavity.
It is also used to judge whether the furnace is ignited or not in the ignition stage. In normal working conditions it helps to
judge whether the flame is burning continuously or not.
Overheating Sensor
The overheating sensor is installed on the outer wall of the middle of the heat exchanger. When the exchanger's temperature is over 210 oC for a long
time the controller cuts off the fuel pump circuit, stops the fuel supply, and then shuts down the heater to protect the system from overheating.
Temperature Sensor
The temperature sensor is plugged into the corresponding socket on the controller. It measures the air temperature at the air inlet and according to this
temperature the controller changes the working status of combustion furnace to adjust the output power.
Power Supply
The heater shares the power supply with the car's engine, or secondary battery but with a separate fuse. When the power supply voltage is lower than the
specified lower limit value or higher than the specified upper limit value, the heater will automatically report the fault.
Fuel Supply
The fuel used by the heater can be supplied by a special fuel tank. Fuel delivery and fuel supply adjustment is via a fuel pump from vehicle tank or separate
tank.
