Microprocessor controller for diesel fuel fired heater

Details Microprocessor controller for diesel fuel fired heater Microprocessor controller for diesel fuel fired heater

F - Mech Eng,Light,Heat,Weapons

24

D

F24D 19/10 (2006.01) B60H 1/03 (2006.01) B60H 1/22 (2006.01) F23N 5/20 (2006.01) F02B 3/06 (2006.01)

Patent

CA 2127008

A diesel heater includes a combustion chamber and a fuel pump for pumping diesel fuel to the combustion chamber. An air supply device supplies combustion air to the combustion chamber. An igniter ignites the diesel fuel to generate combustion heat. A heat exchange fluid supplying device supplies fluid in heat exchange relationship with the combustion heat. A thermal sensor in contact with the heat exchange fluid generates a temperature signal related to the temperature of the heat exchange fluid. A flame detector detects an ignited diesel fuel flame and generates a flame signal in response thereto. A microprocessor includes a memory and a plurality of input/output ports wherein the input/output ports are electrically connected to the thermal sensor, the fuel pump, the heat transfer fluid supplying device, the igniter, the combustion air supply device, and the flame detector. The memory stores a normal operating sequence, a start-up sequence, and a fail start period for the start-up sequence. An input device allows the current day and current time to be entered into the microprocessor memory. The microprocessor thereafter updates the current day and current time. A lower threshold temperature for the heat exchange fluid is entered into the microprocessor memory by the input device. A start day and start time are also entered into the microprocessor memory by the input device. The microprocessor automatically initiates the start-up sequence when the heat transfer fluid falls below the lower threshold temperature or when the current day and the current time equal the start day and the start time. The microprocessor executes the normal operating sequence when the flame signal is received. -30-

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