Liebert himod - View Run Hours Log; View 24 Hour Run Time History; View Total Run Hours; Control Circuit Board

26 Operation with Advanced Microprocessor with Graphics Control
3.12 View Run Hours Log
Selecting VIEW RUN HOURS LOG will step to the following menu:
• VIEW 24 HOUR RUN TIME HISTORY
• VIEW TOTAL RUN HOURS
3.12.1 View 24 Hour Run Time History
The 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% or 3
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 that hour.
3.12.2 View Total Run Hours
The total operating hours of all major components in the unit can be monitored from the display and
are retained in nonvolatile memory. Run times are available for the following:
•COMPRESSOR
• GLYCOOL COIL (or Chilled Water Coil as used on Dual Cool Units)
•MAIN FAN
• HUMIDIFIER
• REHEAT 1
• REHEAT 2
• HEAT REJECTION
The component run hours for each individual component can be reset by selecting the run hours dis-
play screen for the desired component, then pressing ENTER within five (5) minutes of applying
power to the control. The user will then be prompted to press ENTER to clear the selected compo-
nent’s run hours.
3.13 Control Circuit board
The 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 display contrast, nonvolatile memory, DIP
switches (which should not require customer changes), control output LEDs, and jumpers for board
configuration. The jumpers 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 Sen-
sors for other configurations.
P51—removed
NOTE
Run hours for a component should ONLY BE RESET when the component has been replaced.