Vertiv Liebert CRV - High-Temperature Lock-Off for Digital-Scroll Compressors

If a high-head-pressure alarm event trips 3 times in a rolling 12-hour period, the affected compressor is
locked “off.” Once locked-off, the compressor remains locked-off even if pressure drops below the alarm
threshold.
Unlock the compressor in one of the following ways:
• Cycle main power of the cooling unit.
– or –
• Reset the high-pressure alarm code via iCOM Diagnostics.
To unlock the compressor:
1. On the Service menu, touch Diag n ostic/S ervice > Diag n ostics.
The DIAGNOSTICS panel opens.
2. On the COMPRESSOR CIRCUIT panel, touch S et to Zero next to High Pressure Alarm Code,
thentouch S av e.
The code is reset and the compressor can now operate.
11.4.4 High-temperature Lock-off for Digital-scroll compressors
Cooling units equipped with digital-scroll compressors with a thermistor provide protection via a
maximum operating temperature for the compressor(s). A high-temperature situation prompts an alarm
notification and locks the compressor “off” for at least 30 minutes. The compressor will resume operation if
the temperature has cooled to safely operate after 30 minutes.
If a high-temperature alarm event occurs 5 times in a rolling 5-hour period, the compress is locked-out.
Once locked-off, a compressor can be unlocked in one of the following ways:
• Cycle main power of the cooling unit.
– or –
• Reset the high-temperature alarm counter via iCOM Diagnostics.
To unlock the compressor:
1. On the Service menu, touch Diag n ostic/S ervice > Diag n ostics.
The DIAGNOSTICS panel opens.
2. Touch C om p ressor Circu it N in the Category list (where N is the circuit number of the locked-
off compressor).
3. On the COMPRESSOR CIRCUIT panel, touch S et to Zero next to High Temperature Alarm
Counter, thentouch S av e.
The code is reset and the compressor can now operate.
Vertiv | Liebert CRV Installer/User Guide | 124