Figure 6.26 Diagnostics/Service mode, page 1 of 6
HP 1A Alarm Code—Compressor 1A high-pressure alarm code. Values can be 0, 2, 4 or 5. 0 indicates no
alarms or the alarm counter has been reset. 2 indicates the high-pressure input has been continuously
activated for 30 seconds. 4 indicates there have been four high-pressure situations within 10 minutes. 5
indicates there have been three high-pressure instances within a rolling 12-hour period.
HP 1B Alarm Code—Compressor 1B high pressure alarm code. Values can be 0, 2, 4 or 5. 0 indicates no
alarms or the alarm counter has been reset. 2 indicates the high pressure input has been continuously
activate for 30 seconds. 4 indicates there have been four high pressure situations within 10 minutes. 5
indicates there have been three high-pressure instances within a rolling 12-hour period.
HP 2A Alarm Code—Compressor 2A high pressure alarm code. Values can be 0, 2, 4, or 5. 0 indicates no
alarms or the alarm counter has been reset. 2 indicates the high pressure input has been continuously
activate for 30 seconds. 4 indicates there have been four high pressure situations within 10 minutes. 5
indicates there have been three high-pressure instances within a rolling 12-hour period.
HP 2B Alarm Code—Compressor 2B high-pressure alarm code. Values can be 0, 2, 4 or 5. 0 indicates no
alarms or the alarm counter has been reset. 2 indicates the high-pressure input has been continuously
activate for 30 seconds. 4 indicates there have been four high-pressure situations within 10 minutes. 5
indicates there have been three high-pressure instances within a rolling 12-hour period.
Tandem Bank 1 LP Code—Compressor Circuit 1 low-pressure alarm code. Values can be 0, 1 or 3. 0
indicates no alarms. 1 indicates upon startup of a tandem bank of compressors pressure was not
established for the compressors to be able to continue to run. 3 indicates that after operating normally,
the low-pressure switch opened and the tandem bank of compressors was unable to establish pressure.
Tandem Bank 2 LP Code—Compressor Circuit 2 low pressure alarm code. Values can be 0,1 or 3. 0
indicates no alarms. 1 indicates upon startup of a tandem bank of compressors pressure was not
established for the compressors to be able to continue to run. 3 indicates that after operating normally
the low-pressure switch opened and the tandem bank of compressors was unable to establish pressure.
Vertiv | Liebert® XDC™ User Manual | 89
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