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Refrigerant Connections
Liebert
®
CRV
™
18
6.0 REFRIGERANT CONNECTIONS
NOTICE
Risk of oil contamination with water. Can cause equipment damage.
The piping must not be open to the atmosphere for extended periods because the Liebert CRV
requires POE (polyol ester) oil. POE oil absorbs water at a much faster rate when exposed to
air than previously used oils. Because water is the enemy of a reliable refrigeration system,
extreme care must be used when opening systems during installation or service. If water is
absorbed into the POE oil, it will not be easily removed and will not be removed through the
normal evacuation process. If the oil is too wet, it may require an oil change. POE oils also
have a property that makes them act as a solvent in a refrigeration system. Maintaining
system cleanliness is extremely important because the oil will tend to bring any foreign
matter back to the compressor.
The Liebert CRV can be connected to a condenser through either the top or bottom of the unit. The
unit is piped for connections at the top of the unit as shown in Figure 14, with provision for
connection through the bottom of the unit.
Connecting through the bottom of the unit requires cutting the liquid and suction lines as shown in
Figure 15. Cutting these lines disconnects the top connections from the rest of the refrigeration system.
Air-cooled units are shipped with a holding charge of nitrogen.
!
WARNING
Risk of explosive discharge from high-pressure refrigerant. Can cause injury or death.
This unit contains fluids and/or gases under high pressure.
Relieve pressure before working with piping.
!
WARNING
Risk of refrigerant system rupture or explosion from overpressurization. Can cause
equipment damage, injury and death.
A pressure relief valve is required for compliance with the EU Pressure Equipment
Directive and may be required for compliance with local codes. If a discharge pressure relief
device is not provided with the condenser unit, the system installer must install one in the
high side of the refrigerant circuit and rated for a maximum of:
• 675psig (46.5bar) for water/glycol-cooled units
• 700psig (48.3bar) for air-cooled units
A shutoff valve must not be installed between the compressor and the field-installed relief
valve.
One or more additional pressure relief valves are required downstream of any and all
field-installed isolation. Do not isolate any refrigerant circuits from overpressurization
protection.