Vertiv Liebert XDC User Manual

• TANDEM BANK 2 LP—Activated when the low-pressure switch for Tandem Compressor
Bank2 doesn't send the proper signal during normal operation, or during pump-down. This
alarm will reset when the main power is cycled or the Tandem Bank 2 LP Code variable in the
Service Diagnostics menu is reset to 0.
• TANDEM BANK 1 PD—Activated when Tandem Compressor Bank1 suction pressure cannot
be pumped down below the threshold during compressor shutdown. This alarm will reset when
the main power is cycled or the Tandem Bank 1 PD Alarm Code variable in the Service
Diagnostics menu is reset to 0.
• TANDEM BANK 2 PD—Activated when Tandem Compressor Bank 2 suction pressure cannot
be pumped down below the threshold during compressor shutdown. This alarm will reset when
the main power is cycled or the Tandem Bank 2 PD Alarm Code variable in the Service
Diagnostics menu is reset to 0.
• 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.
8.2 Warning Descriptions
• COMPRESSOR 1A HRS EXCEED—Activated when the Compressor 1A Actual Hours exceeds
the user-specified limit. To reset, Actual Hours must be reset to 0.
• COMPRESSOR 1B HRS EXCEED—Activated when the Compressor 1B Actual Hours exceeds
the user-specified limit. To reset, Actual Hours must be reset to 0.
• COMPRESSOR 2A HRS EXCEED—Activated when the Compressor 2A Actual Hours exceeds
the user-specified limit. To reset, Actual Hours must be reset to 0.
• COMPRESSOR 2B HRS EXCEED—Activated when the Compressor 2B Actual Hours exceeds
the user-specified limit. To reset, Actual Hours must be reset to 0.
• 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.
• 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 XDC
will restart at a user-defined time delay after power is restored. Once activated, the alarm will
remain activated for 30 minutes.
8.3 System Shutdown Causes
Unit Is Off By Refrig Sens Fail
The control has lost its signal from the refrigerant temperature 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 upon startup or after a loss of differential pressure. The
control looks at the SHORT CYCLE time delay. If it cannot establish differential pressure within that
amount of time, the unit is shut down. Main power (disconnect switch) must be turned Off, then back
On to clear this alarm.
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Vertiv Liebert XDC Specifications

General

Brand	Vertiv
Model	Liebert XDC
Category	Freezer
Language	English