Vertiv Liebert MC - Piping; Electrical Connections

15
Liebert
®
MC - UM - 10019237MAN_ENG - 31.03.2022
8.5 Piping
Release the
pressure
WARNING
The circuit is pressurized by nitrogen/helium at 2 bar.
Before welding the pipeline, discharge completely the circuit to release the pressure.
Connections The inlet and outlet directions are clearly marked with labels and arrows on the respective pipings.
Pay attention to follow the directions.
Take care of the
sensors
While welding the pipeline, take care to disconnect the pressure transducer and the temperature sensor.
Re-connect the pressure transducer and the temperature sensor once the welding operation is completed
and the pipes have cooled down. Not present with Control by Indoor Unit.
Piping sizes
Model Pipe IN Pipe OUT
MCL055 28 35
MCM080 28 35
MCL110 35 35
MCL165 35 35
Keep clean • Keep piping clean and dry.
• Ensure that the tubing surfaces to be brazed are clean and that the ends of the tubes have been
carefully reamed to remove any burrs.
• Ensure that all loose material has been cleaned from inside the tubing before brazing.
Brazing
NOTE - When copper is heated in the presence of air, copper oxide forms. POE oil will dissolve these oxides from
inside the copper pipes and deposit them throughout the system, clogging lter driers and aecting other system
components.
• Use copper piping with a brazing alloy with a minimum temperature of 732°C, such as Sil-Fos.
• Avoid soft solders such as 50/50 or 95/5.
• During brazing use pure dry nitrogen through the piping with a ow of 0.5-1.5 l/s
Vibration • Isolate piping from building using vibration isolating supports.
Refrigerant
charge
NOTICE
A not adequate charge of refrigerant could bring to inappropriate work of the refrigeration
system.
Refer to the main unit user manual for the refrigerant charge operation.
8.6 Electrical Connections
8.6.1 General Instructions
Specications • Check the electrical data on the label applied on the unit.
• Check that the available power supply is consistent with the unit power requirements given in 6.1
Technical Data and Performances.
• Refer to the electrical schematic supplied with the condenser when making line voltage supply, low
voltage main unit interlock and any low voltage alarm connections.
• Make sure all electrical connections are tight.
• Electrical service must conform to national and local electrical codes.
• All wiring must be done in accordance with all applicable local, state, and national electrical codes.
• Use copper wiring only.
• For specic electrical requirements, see the electrical schematic provided with the unit.
• The voltage supply to the condenser might be di󰀨erent from voltage supply to the main unit.
Outdoor • The protection tube or shielded line is required for the outdoor part of the connecting cable between
the main unit and the condenser.