Mechanical Installation
Vertiv | Liebert CRD10 | User Manual
38
3.7.1
Piping Connections
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.
The pipes to be included in the piping process of the AC are listed below:
•
Condensed water drainage pipe of the indoor unit
•
Connection of the copper pipe (discharge pipe and liquid pipe) between the indoor unit and outdoor unit
•
Liquid line solenoid valve kit
NOTES:
•
On-site pipeline connection must be completed by qualified technician.
•
On-site pipeline connection must comply with local regulations, such as ASHRAE 15, CSA B52 and local
construction laws.
•
Pipeline welding will cause overheating of the pipeline and open flame. If the installation environment
does not allow, installation is prohibited. The installation environment must be free of combustible
materials to avoid fire.
The following points need to be taken into consideration during the piping process:
•
All the joints of the refrigerating pipes must be silver-brazed.
•
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. PVE 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 ft
3
/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.
•
The selection, layout, and fixing of the pipes must conform to the industry standards and norms.
•
Vacuum pumping and refrigerant charging operations, and procedures must conform to the industry
standards.
•
Pressure drop, compressor oil return, noise return, and vibration must be considered during the
designing and installation process.
