Vertiv CoolPhase CDU - Refrigerant Piping and Charging

Item Description
UC4 Secondary fluid return connections
UC3 Secondary fluid supply connections
L1 and L2 Supply refrigerant connections (outdoor air-cooled condensers)
G1 and G2 Return refrigerant connections (outdoor air-cooled condensers)
NOTE: For installation clearance and access information, refer to Vertiv drawings 20000058 in Submittal Drawings on
page107 .
5.3 Refrigerant Piping and Charging
WARNING! Risk of over pressurization of the refrigeration system. Can cause explosive discharge of high
pressure refrigerant, loss of refrigerant, environmental pollution, equipment damage, injury, or death. This
unit contains fluids and gases under high pressure. Use extreme caution when charging the refrigerant
system. Do not pressurize the system higher than the design pressure marked on the unit's nameplate.
WARNING! Risk of explosive discharge of high-pressure refrigerant. Can cause serious injury or death.
Building and equipment damage may also result. Neutral and service ports on the compressor service valves
do not have a valve core. Front-seat the service valves and relieve pressure from the compressor before
loosening a part or a component attached to the service valve. Follow local codes to properly reclaim
refrigerant.
CAUTION: Risk of excessive refrigerant line pressure. Can cause equipment damage or injury resulting from
tubing and component rupture. Do not close off the refrigerant line isolation valve for repairs unless a
pressure relief valve is field installed in the line between the isolation valve and the check valve. The
pressure-relief valve must be rated 5% to 10% higher than the system design pressure. An increase in
ambient temperature can cause the pressure of the isolated refrigerant to rise and exceed the system design
pressure rating (marked on the unit nameplate).
CAUTION: Risk of contact with hot surfaces. Can cause injury. Personal burn injury can be the result of
touching a compressor, refrigerant discharge lines, and some electrical components that are extremely hot
during unit operation. Allow sufficient time for them to cool to a touch-safe temperature before working
within the unit cabinet.
Use extreme caution and wear appropriate, OSHA-approved PPE when working on or near hot components.
Consult local building and plumbing codes for installation requirements of additional pressure relief devices when isolation
valves are field installed. Do not isolate any refrigerant circuits from over pressurization protection.
5 Refrigerant Piping Requirements Proprietary and Confidential ©2024 Vertiv Group Corp. 47
Vertiv™ CoolPhase CDU Installer/User Guide