MODEL NO. MODEL WIDTH SYSTEM TYPE SUPERHEAT SUBCOOLING
CR019 12in. (300mm)
Air-cooled 10–20°F (5.6–11.1°C) See Table 6.11 on page46.
Water/Glycol-cooled 15–25°F (8.3–13.9°C) 1–5°F (0.6–2.7°C)
CR020
CR035
24in. (600mm)
Air-cooled 10–20°F (5.6–11.1°C) See Table 6.11 on page46.
Water/Glycol-cooled 10–20°F (5.6–11.1°C) 1–5°F (0.6–2.7°C)
Table 6.14 Target Superheat and Subcooling Ranges by Model Number
6.3 Fluid Piping forAir-cooled,
Water/Glycol-cooledandChilled-waterPipingApplications
NOTICE
Risk of water leakage. Can cause severe property damage and loss of critical data center
equipment.
The Liebert CRV requires a water drain connection. The 600-mm (24-in.) model may require
an external water supply to operate the humidifier. Improper installation, application and
service practices can result in water leakage from the unit.
Do not locate the unit directly above any equipment that could sustain water damage.
We recommend installing monitored leak detection equipment for the water supply lines and
the internal unit water lines.
The following pipe connections are required:
• A drain line from the evaporator coil drain pan.
• A water-supply line to the optional humidifier (if applicable).
• On air, water, or glycol systems: refrigerant piping connections between the evaporator unit
and the condensing unit.
• On chilled-water systems: connections to the building chilled-water source.
• On water-glycol systems: connections to a water or glycol loop.
6.3.1 Water/Glycol Loop Piping Guidelines
NOTICE
Risk of frozen pipes and corrosion from improper coolant mixture. Can cause equipment
damage and building.
When piping or the cooling unit may be exposed to freezing temperatures, charge the system
with the proper percentage of glycol and water for the coldest design ambient temperature.
Automotive antifreeze is unacceptable and must NOT be used in any glycol fluid system. Use
only HVAC glycol solution that has been prepared by industry practices.
Vertiv | Liebert CRV Installer/User Guide | 51
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