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REQJA CPT Controller Manual Line-Leak Detection The Red Jacket CPT system can provide compliance with EPA ° requirements for hourly leak detection. This feature provides 3-gph positive shutdown when a leak is detected. The 3-gph leak detection feature replaces the mechanical line-leak detector that would normally be installed on the pump. Stand-alone Pump Operation The CPT Controller's microprocessors are preprogrammed from the factory for stand-alone operation. Instructions in chapter 3 explain how to set the DIP switches for stand-alone operation, and instructions in chapter 4 explain how to set the pump pressure to achieve the maximum flow rate of 10 gpm per nozzle. The installer sets the required pressure at the controller to maintain the pressure necessary to deliver a maximum of 10 gallons per minute (gpm) to the dispenser whether one or numerous nozzles are operating. Tandem Pump Operation When two CPT pumps are required to maintain proper flow, these units can be programmed to operate in tandem. The installer can designate one controller as the master unit and the other as the auxiliary unit. The master controller monitors line pressure to maintain proper flow. .I When the master controller receives the dispense-enable signal, the primary pump starts. The controller varies the speed of the pump depending on the pressure in the line. When the primary pump can no longer maintain proper pressure, the secondary pump turns on to supplement the pressure and maintain proper flow. For each dispensing cycle, the master controller determines which CPT will be the primary pump. This feature allows the pumps to alternate and prevents the problem of having one tank run dry. It also ensures that one pump does not wear excessively. The master controller performs line-leak detection, if required. t Chapter 1:Introduction 1-2 ARE260-240 Rev.A ♦ 6/97