238-47104-00A - Bradford White

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SEQUENCE OF OPERATIONSequence of Operation- Double Element, Simultaneous Operation, 3 Phase.1Line voltage is applied across terminals L1& L3 of upper thermostat. Line voltage alsoextends to terminal L1 of lower thermostat.Also, line voltage is applied to terminal L3of lower thermostat. ECO in both upper &lower thermostat is closed, so there isvoltage at terminal L4 of both thermostatsand to one side of both upper & lowerelements.1 2ECOClosedThermostat closedat terminal T22Tank is cold therefore both thermostatsare closed at terminal T2 (calling for heat).This completes the circuit through thethermostats and allows current to flowthrough the elements.ECOClosedThermostat closedat terminal T23When either thermostat is satisfied, it willopen at terminal T2, interrupting currentflow through the corresponding element. Asboth thermostats satisfy, the system will bein stand-by mode waiting for the next callfor heat. Thermostats will operateindependent of the other.Thermostat openat terminal T23Thermostat openat terminal T2Page 1010
SEQUENCE OF OPERATIONSome electric utility companies will offer discounts for using electricity during “Off Peak” Times of the day. The systemallows the use of an “Off Peak” meter, which interrupts power to the lower element during high power demand periods.Sequence of Operation- Double Element, Non-Simultaneous Operation, Single Phase, Off Peak.12Line voltage is applied across terminalsL1 & L3 of the upper thermostat. Line voltage fromoff peak meter is supplied to terminal L1 of lowerthermostat. ECO in the upper thermostat is closed,so there is voltage at terminal L4 of upperthermostat and to one side of the upper element.Tank is cold therefore both thermostatsare closed at terminal T2 (calling for heat). Thecircuit is complete through the upper thermostatonly, allowing current to flow through upperelement.FromOff PeakMeter1 2ECOClosedThermostat closedat terminal T23When upper thermostat is satisfied, it opens atterminal T2 interrupting current flow through upperelement, and closes at terminal T4 allowing voltageto pass to one side of the lower element. Thiscompletes the circuit through the lower thermostatand off peak meter allowing current flow throughlower element.Thermostat closedat terminal T24When the lower thermostat is satisfied, it opens atterminal T2 interrupting current flow through lowerelement. The system is now in stand-by modewaiting for the next call for heat5During peak power demand periods as determinedby the local utility, the off peak meter will interruptpower to terminal L1 of lower thermostat. Only thetop thermostat/element combination is allowed tooperate during this period.FromOff PeakMeter34 5Off PeakPower interruptedThermostat closedat terminal T4Thermostat closedat terminal T2Thermostat closedat terminal T2Thermostat openat terminal T2Page 1111
Page 1 and 2: RESIDENTIAL ELECTRIC AND LIGHT DUTY
Page 3 and 4: GENERAL INFORMATIONCommonly Used Fo
Page 5 and 6: GENERAL INFORMATIONSurface Mounted
Page 7 and 8: SEQUENCE OF OPERATIONNon-Simultaneo
Page 9: SEQUENCE OF OPERATIONSequence of Op
Page 13 and 14: TROUBLESHOOTINGQuick Step Plan to H
Page 15 and 16: SERVICE PROCEDURE RE-IIHeating Elem
Page 17 and 18: SERVICE PROCEDURE RE-IIIResidential
Page 25 and 26: SERVICE PROCEDURE RE-IVLight Duty C
Page 33 and 34: SERVICE PROCEDURE RE-VThermostat Re
Page 35 and 36: SERVICE PROCEDURE RE-VIIDip Tube an
Page 37 and 38: NOTES37
Page 39 and 40: NOTES39

238-47104-00A - Bradford White

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