Liebert Challenger 3000

3.12.1 View 24 Hour Run Time HistoryOperation with Advanced Microprocessor with Graphics ControlThe history of each load for every hour during the past 24 hours is displayed in the run hour history.The percentage of each hour that the load was on is displayed from 0 to 100% in increments of 5% or3 minutes. Loads with a variable output are displayed as a percentage of their capacity for an hour.For example, a variable load that is 50% on for 1/2 of the hour will be displayed as 25% on for thathour.3.12.2 View Total Run HoursThe total operating hours of all major components in the unit can be monitored from the display andare retained in nonvolatile memory. Run times are available for the following:• Compressor• GLYCOOL Coil (or Chilled Water Coil as used on Dual Cool Units)•Fan• Humidifier• Reheat 1 (or Hot Water Reheat or SCR Reheats)• Reheat 2• Heat RejectionThe component run hours for each individual component can be reset by selecting the run hours displayscreen for the desired component, then pressing ENTER within 5 minutes of applying power tothe control. The user will then be prompted to press ENTER to clear the selected component's runhours.NOTERun hours for a component should be reset ONLY when the component has been replaced.3.13 Control Circuit boardThe control circuit board is located inside the unit behind the LCD display and control key panel.Open the front panel for access to the board.The control board includes an adjustment for LCD contrast, nonvolatile memory, DIP switches (whichshould not require customer changes), control output LEDs, and jumpers for board configuration. Thejumpers should be placed as follows:•P5—removed• P12—removed• P19—installed on Pins 1 and 2• P47— installed on Pins 1 and 2• P48—installed on Pins 1 and 2• P50—all jumpers installed for 4-20 mA analog inputs. See 4.5.1 - Connecting the Analog Sensorsfor other configurations.• P51—removed3.13.1 LCD ContrastThe level of contrast due to the viewing angle of the LCD can be adjusted using a small thumb wheelat the upper left of the control board just under the cable going to the display. The control is labeledRA1.NOTEThe LCD backlighting will turn on when any key is pressed and will go off 5 minutes afterthe last key is pressed.27