Liebert Extreme Density Chiller XDC - Manual (Page 55)

Alarm Descriptions and Solutions
49
6.6 View Alarm History
To view the alarm history:
1. Press the MENU key.
2. Use the up or down arrow key to move to the ALARM HISTORY menu.
3. Press the ENTER key to enter into the menu.
4. Use the up or down arrow key to move through the menu and view the alarm history.
This menu will show the most recent alarm first. This menu also will display the alarm name,
alarm number and the time and date of occurrence for the last 60 alarms.
5. When finished, press the ESC key two to three times to get back to the main display.
6.7 System Shutdown Causes
• Unit Is Off By Refrig Sens Fail: The control has lost its signal from the refrigerant tempera-
ture sensor. The control has no way of controlling the refrigerant temperature, so the unit is shut
off. Main power (disconnect switch) must be turned OFF then back ON to clear this alarm.
• Unit Is Off By Pump Short Cycle: The control was unable to get a pump started at startup or
after a loss of differential pressure. The control looks at the SHORT CYCLE time delay. If it can-
not establish differential pressure within that amount of time the unit is shut off. The user may
set this time by changing the SHORT CYCLE alarm time delay. Main power (disconnect switch)
must be turned OFF then back ON to clear this alarm.
• Unit Is Off By Low Refrig Temp: The control was unable to raise the refrigerant temperature
to the calculated refrigerant temperature control point. The unit is shut off, because if the control
cannot raise the refrigerant temperature to the calculated refrigerant temperature control point,
there will be a possibility of water condensing on the refrigerant piping and receiving coils. Main
power (disconnect switch) must be turned OFF then back ON to clear this alarm.