IMPROVEMENTS TO WATER HEATER CONTROL SYSTEMS, BURNER CONTROL SYSTEMS AND DIFFUSERS FOR GAS BURNERS

摘要

The present invention provides a control system for a water heater (1 ), said water heater including a burner (5) to combust an air and combustible gas mixture; a delivery means to deliver said mixture to said burner; a gas metering means to control the amount of combustible gas entering an air stream to form said mixture; a variable speed fan (6) to form said air stream and ultimately deliver said mixture to said burner; a temperature sensor (T2) to provide a signal representative of the temperature of the water exiting said wate heater; a flow sensor (64) to provide a signal representative of the rate of flow of water exiting the water heater, and a control unit (60) to receive said signals from said temperature sensor and said flow sensor; the control unit producing a signal to vary the fan speed in response to said signals to modulate the heat output of said burner, said burner being a type having a turn down ration in the rage of 8:1 to 25:1.