Refrigerant R-410A
High Side Low Side
Design Pressure
530 psig
3,655 kPa
235 psig
1,620 kPa
High Pressure Cut Out Safety Switch
580 psig
3,999 kPa
N/A
Field installed interconnecting piping must be properly selected and installed based on local and national codes, the user manual, and the unit serial tag.
Source: DPN000788.
NOTICE
Risk of oil contamination with water. Can cause equipment damage.
Vertiv™ CoolPhase CDU systems require the use of POE (polyolester) oil. POE oil absorbs water at a much faster
rate when exposed to air than previous 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 into the compressor.
NOTICE
Units should never be operated with no refrigerant charge, a holding charge, a proper load or without additional
oil as required added. Tag out system to prevent unauthorized personnel from accidentally starting equipment
and damaging compressors if any of these conditions exist.
5.3.1 Refrigerant Piping Guidelines for Air Cooled Systems
• Field installed interconnecting piping should be properly selected based on local codes and unit labeling.
• Air cooled units ship with a nitrogen holding charge. Do not vent the charge until all refrigerant piping is in place,
ready for connection to the unit and condenser.
• Use copper piping with a brazing alloy with a minimum temperature of 1,350°F (732°C), such as Sil-Fos. Avoid soft
solders, such as 50/50 or 95/5.
• Use a flow of dry nitrogen through the piping during brazing to prevent formation of copper oxide scale inside
the piping. When copper is heated in the presence of air, copper oxide forms. POE oils will dissolve these oxides
from inside the copper pipes and deposit them throughout the system, clogging filter driers and affecting other
system components.
• A pure dry nitrogen flow of 1-3 ft3/min (0.5-1.5 l/s) inside the pipe during brazing is sufficient to displace the air.
Control the flow using a suitable measuring device.
• Ensure that the tubing surfaces to be brazed are clean and that all burrs have been removed from the ends of the
tubes.
• Ensure that all loose material has been cleaned from inside the tubing before brazing.
• Protect all refrigerant line components within 18 in. (460 mm) of the brazing site by wrapping them with a wet
cloth or with a suitable heat-sink compound.
• The Vertiv™ Liebert® MCV heat rejection skid cannot be installed below the evaporator.
• Isolate piping from building using vibration-isolating supports.
48 Proprietary and Confidential ©2024 Vertiv Group Corp. 5 Refrigerant Piping Requirements
Vertiv™ CoolPhase CDU Installer/User Guide
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