Open-circuit Applications
The cooling unit receives cooling water in an open circuit from an external cooling water source. For open-
circuit applications note the following:
• Use the unit with mains or well water. Do not use water from an evaporative cooling tower
unless the water hardness is controlled.
• The water pressure must be 29to145psi (2to10 bar). If water pressure is outside this range,
contact Vertiv™ for technical support.
• The required water flow at different temperatures is available from Vertiv™ technical support.
• If water temperature is very low, insulate both pipes.
Closed-circuit Applications
The cooling unit receives cooling water in a closed circuit using a drycooler. For closed-circuit
applications, note the following:
• Install a pump system calculated on the basis of the flow and total head of the system (see site
plan data) and controlled by the compressor running (see label on the unit).
• Insulate both pipes.
IMPORTANT! Add water and ethylene glycol to the circuit when the ambient temperature is below 32°F
(0°C). Refer to the Liebert CRV System Design Manual, SL-11978). Do not exceed the nominal operating
pressure of the circuit components.
• Bleed air out of the circuit.
• The following figure shows the recommended installation of a drycooler.
Vertiv | Liebert CRV Installer/User Guide | 54
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