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730 CHAPTER 11: Intermittent and Recirculating Packed-Bed Filters <br /> AL <br /> A <br /> R <br /> SR <br /> CR1 <br /> AS o zs <br /> FPRL <br /> CR1 <br /> OCT sass' M <br /> CR CRI <br /> GR2 <br /> —� Auto <br /> — Off <br /> Man <br /> PT <br /> M <br /> TL <br /> 1 2 3 4 5 6 7 N N N iDF C3 <br /> High-level , <br /> alarm and <br /> override N.O. <br /> on/off <br /> i <br /> N.O. <br /> Low-level off Neutral L1 L1 Ground <br /> S <br /> N.C. <br /> Redundant off and <br /> low level alarm U Pump <br /> -- Factory wire M = Motor contactor <br /> Field wire OCT = High-level override event counter <br /> Alternate field wire PT = Programmable timer <br /> A = Audio alarm, 115 Vac SR = Silence control relay <br /> AL = Alarm light TL = Terminal link <br /> AS = Audio silence switch <br /> CB = Circuit breaker ' Options <br /> CR1 = Redundant off relay ETM = Elapsed time meter <br /> CR2 = PT override relay CT = Event counter <br /> DF = Disconnect fuse PRL = Pump run light <br /> FIGURE 11-13 <br /> Typical schematic wiring diagram for an intermittent sand filter (courtesy Orenco <br /> Systems, Inc.). <br />