Patent ID: 7597552
Filing Date: 2009-10-06
Classification: B60H,F23N

Abstract:
1. A heater for a liquid, the heater comprising: a liquid fuel combustion chamber; a jacket for the liquid extending about the combustion chamber; a burner head assembly connected to the combustion chamber, the burner head assembly including a burner having a nozzle with an ignitor; a compressor and a fuel pump for supplying liquid fuel to the burner nozzle; a fan for providing air to the combustion chamber; an electric motor operatively connected to the fan and the compressor; a flame sensor for sensing the presence or absence of a flame in the combustion chamber; and a control module for determining whether a fault has occurred, the control module cyclically checking the flame sensor once per second to determine whether or not a flame is present alter the heater is started, the control module actuating the ignitor if no flame is present, a first memory of the control module registering a flame-on event if a flame is present and a second memory of the control module registering a flame-off event if no flame is present, the control module indicating that a fault has occurred when a 10 flame-off events are registered before 15 flame-on events are registered and the control module beginning a new cycle when 15 flame-on events are registered before 10 flame-off events are registered.