• CUSTOMER INPUT 1—Activated when a 24VAC signal is applied to the customer alarm input
on the control board. This alarm will reset when the 24VAC signal stops being sent from the
customer alarm input. WATER UNDER FLOOR, SMOKE DETECTED, CALL SERVICE and COMP
LOCK PD are possible designations for this alarm; they are set with the Unit Code.
• FAN FAILURE (optional)—Activated when a 24VAC signal is applied to the fan failure input on
the control board using a twisted pair of wires or the alarm is sent via CANbus communication.
This alarm will reset when the alarms is acknowledged and the signal stops being sent from
CANbus or fan failure input. The alarm can also be reset by cycling the power.
• HIGH DEW POINT—Activates when the calculated dew point at either Sensor A or B exceeds
the user-specified alaram setpoint. The alarm will reset when the calculated room dew point
from both Sensor A and Sensor B is 2°F (1.1°C) below the setpoint and the alarm has been
acknowledged.
• HIGH REFRIGERANT TEMP—Activated when the refrigerant temperature sensor reads the
refrigerant temperature above the user-specified alarm setpoint. This alarm will reset when the
reading from the refrigerant temperature sensor drops 2°F (1.1°C) below the user-specified
setpoint and the alarm has been acknowledged.
• HIGH TEMP SENSOR A—Activated when the reading from Sensor A is above the user-
specified alarm setpoint. The alarm will reset when the reading from Sensor A drops 2°F (1.1°C)
below the setpoint and the alarm has been acknowledged.
• HIGH TEMP SENSOR B—Activated when the reading from Sensor B is above the user-
specified alarm setpoint. The alarm will reset when the reading from Sensor B drops 2°F (1.1°C)
below the setpoint and the alarm has been acknowledged.
• LOSS OF FLOW PUMP 1—Activated when Pump 1 is commanded to run and the differential
pressure switch does not sense differential pressure (set at 6 psi; 41kPa; 0.41 bars). After
attempting to start Pump 1 three times, the Liebert XDC will automatically switch to the other
pump to establish flow. This alarm will reset when flow has been established on Pump 1 and the
alarm has been acknowledged.
• LOSS OF FLOW PUMP 2—Activated when Pump 2 is commanded to run and the differential
pressure switch does not sense differential pressure (set at 6 psi; 41kPa; 0.41 bars). After
attempting to start Pump 2 three times, the Liebert XDC will automatically switch to the other
pump to establish flow. This alarm will reset when flow has been established on Pump 2 and the
alarm has been acknowledged.
• LOW MEMORY—Activated when the control board is low in memory resources. This alarm
rests automatically as soon as memory consumption falls below the threshold.
• LOW REFRIGERANT TEMP—Activated when the supply refrigerant temperature sensor
temperature reading drops below the higher of the two calculated dew points, assuming that
neither Sensor A or Sensor B has a sensor failure alarm. This alarm will reset when the
refrigerant temperature sensor reads the refrigerant temperature above both of the two
calculated dewpoints and the alarm has been acknowledged. This alarm can lock the unit Off. If
this occurs, the main power must be cycled, or the Low Refrig Temp Alarm Code in the Service
Diagnostics menu must be reset to 0.
• LOW TEMP SENSOR A—Activates when the reading from Sensor A drops below the user-
specified alarm setpoint. The alarm will reset when the reading from Sensor A rises 2°F (1.1°C)
above the setpoint and the alarm has been acknowledged.
• LOW TEMP SENSOR B—Activates when the reading from Sensor B drops below the user-
specified alarm setpoint. The alarm will reset when the reading from Sensor B rises 2°F (1.1°C)
above the setpoint and the alarm has been acknowledged.
Vertiv | Liebert® XDC™ User Manual | 116
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