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SEQUENCE OF OPERATION <br /> COMPONENT ACTION <br /> 0 m <br /> SENSOR OVERHEAT <br /> m <br /> Voltage is completed through the Limit and over-heat <br /> sensor switches. <br /> O m <br /> LIMIT SWITCH <br /> m <br /> ELECTRODE / FLAME <br /> PROBE ASSEMBLY Module board receives voltage and ignition circuit begins <br /> (approximately seven (7) seconds from faucet being <br /> turned ON). Spark and gas valve are energized (ignition <br /> cycle approximately seven (7) seconds). <br /> Flame sense is confirmed during trial for ignition (TFI) <br /> time frame <br /> GAS VALVE <br /> 0 <br /> Burners will remain ON until the water flow is turned OFF. <br /> o NOTE: Depending on demand the Proportional valve will <br /> REGULATOR TWO energize two (2) orifices or five (5) during cycle. <br /> STAGE <br /> Blower motor will operate approximately 20 seconds <br /> after the hot water faucet is turned OFF. <br /> NOTE: If ignition fails on first TFI there is prepurge time of three (3)seconds and ignition begins with <br /> a seven (7) second TFI if flame is not detected in second TFI it goes into a third TFI if flame is not <br /> detected the module board goes into LOCKOUT and requires reset of Power or turn faucet OFF then <br /> back ON to start cycle. _ <br /> If the ON DEMAND CONTROL CENTER is connected an E1 code will be displayed. Reset switch or Imo ' <br /> turn faucet OFF and back ON to start cycle. <br /> _Vj OF <br /> F g�4gg <br /> 0 0 0 0 <br /> V <br /> 15 °C/°F / V <br />