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SL4800 Controller Technical Specification

Table of Contents
Technical Specs – SL4800 Series Controllers.pdfDownload


  • 12-zone base model, expandable to 48 zones using slide in SLM12 (Indoor/Outdoor rated)
  • 12-zone hot-swappable modules
  • Internal transformer with commercial terminal block, On/Off power switch and LED status indicator
  • Large backlit LCD display
  • 2 run modes: Standard mode runs user input zone run times; Auto Adjust mode requires SLW Series On-Site Weather Station to calculate weather based run times
  • Rain/Freeze sensor bypass/active button displays sensor status with tricolor LEDs (red indicates sensor is prohibiting irrigation; orange indicates an extended rain delay; green indicates normal operation)
  • 4 programs: A, B, C, D Programs can operate stacked or concurrently
  • 8 start times per program
  • Nonvolatile memory and real time clock/calendar to retain programs and current date and time – no battery required
  • Zone run times from 1 min. to 9 hrs. 55 min. with operation countdown displayed in hours, minutes, and seconds
  • Watering day selections of custom days of the week, odd/even, or interval days (1 – 30 days)
  • Omit settings: omit time of day window, omit day(s) of week, and omit up to 7 calendar dates
  • Monthly % adjust by program, for simple year-round water budgeting


  • Fault review displays all faults, including open and shorted zones
  • On-board multi-meter displays transformer voltage; milliamp measurement for each zone
  • Built-in valve locator chatters the solenoids (patent pending)
  • Review menu displays ET deficits by zone and corresponding zone run times
  • Review menu displays maximum run time and minimum soak times
  • Review menu displays temperature readings (daily high/ low) for previous 5 days
  • Programmable rain delay of 1 – 7 days
  • SLW Weather Station extended rain delay programmable from 0 – 99 hours
  • Run/Soak cycles allow setting of maximum run time and minimum soak time by program for use in Standard mode only
  • Zone-to-zone delay programmable for 1 min. – 3 hrs.
  • Master valve timing sequence with zone valve programmable by “On Delay” (1 sec. – 1 min.; 2 sec. default) and “Off Delay” (1 sec. – 3 min.; 5 sec. default)
  • Two Master valve(s)/pump start(s) operation assignable On/Off by zone
  • Clear program function to selectively delete an individual program
  • Backtrack Stored Program™ feature allows contractor to easily store a default program and retrieve the saved program
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