User's Manual

Alarm Descriptions and Solutions
65 Liebert
®
DCP
™
LOW COOLANT TEMP—Activated when the supply coolant temperature sensor temperature
reading drops below the higher of the two calculated dew points, assuming that neither Sensor A nor
Sensor B has a sensor failure alarm. This alarm will reset when the coolant temperature sensor reads
the fluid temperature above both of the two calculated dew points 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 Coolant Temp Alarm Code in the Service Diagnostics menu must be reset to 0.
LOW TEMP SENSOR A—Activated 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—Activated 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.
PUMP SHORT CYCLE—Activated when the Liebert DCP is trying to establish flow and is unable
to do so. The Liebert DCP will attempt three times to establish flow on a pump before trying the other
pump. The control will keep cycling three times on one pump, then three times on the other pump
until it is able to establish flow. If this cycling occurs for 30 minutes and the Liebert DCP still does not
establish flow, a PUMP SHORT CYCLE alarm will be present. This alarm will shut down the Liebert
DCP. To reset this alarm, the main power must be cycled.
RAM/BATTERY FAIL—Activated when the RAM backup battery or the RAM itself has failed. This
requires a hardware replacement.
SENSOR A FAILURE—Activated when the controls no longer senses a signal from Sensor A. This
alarm will reset when the signal is returned and the alarms has been acknowledged.
SENSOR B FAILURE— Activated when the controls no longer senses a signal from Sensor B. This
alarm will reset when the signal is returned and the alarm has been acknowledged.
SMOKE DETECTED—Activated when the Customer Input 1 is configured for “Smoke” and 24VAC
is applied to the input. This alarm is reset when the 24VAC is removed.
SUPPLY CW SENSOR FAILURE—Activated when the control no longer senses a signal from the
Supply CW sensor. This alarm will reset when the signal is returned.
SUPPLY COOLANT SENSOR FAILURE—Activated when the control no longer senses a signal
from the supply coolant sensor. This alarm will reset when the signal is returned.
UNIT CODE MISSING—Activated when a valid unit code has not been entered and saved. To reset,
enter valid unit code, save and execute.
WATER UNDER FLOOR—Activated when Customer Input 1 is configured for “Water Alarm” and
24VAC is applied to the input. This alarm is reset when the 24VAC is removed.
6.2 Warning Descriptions
LOSS OF POWER—Activated when the unit is On and operational and 24VAC power to the control
is lost. This alarm will be emitted when power is restored to the control. The Liebert DCP will restart
at a user-defined time delay after power is restored. Once activated, the alarm will remain activated
for 30 minutes.
PUMP 1 HRS EXCEED—Activated when the Pump 1 Actual Hours exceeds the user-specified limit.
To reset, Actual Hours must be reset to 0.
PUMP 2 HRS EXCEED—Activated when the Pump 2 Actual Hours exceeds the user-specified limit.
To reset, Actual Hours must be reset to 0.
NOTE
This is not a room smoke detector and is not intended to replace external smoke detectors.