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SEQUENCE OF OPERATION <br /> COMPONENT ACTION <br /> FAUCET Turning on a hot water faucet activates the DEMAND <br /> Water Heater. <br /> FLOW SENSOR The water heater flow sensor senses the flow of water. <br /> MODULE BOARD IW60 <br /> ® 0� <br /> The water heater module board receives voltage signal <br /> from sensor and provides power to the Fan control <br /> module board. (time line 2-3 seconds). <br /> a quo <br /> ® Q MODULE BOARDIW60 <br /> FAN BLOWER <br /> 0 0 <br /> BLOWER ASSEMBLY <br /> O <br /> The combustion air blower motor starts and completes <br /> the circuit to the Pressure switch. (2-3 seconds). <br /> PRESSURE SWITCH <br /> '® o <br /> ®o <br /> 14 <br />