7. Install replacement compressor and make all connections. Replace gaskets or seals on service valves. Replace
unloading solenoid.
8. Evacuate, charge and operate per the appropriate procedure per local codes:
• See Evacuation, Leak Testing, and Charging Air Cooled Systems on page54
NOTICE
Risk of improper component re-installation. Can cause equipment damage.
Identify and mark location of suction pressure transducer and discharge pressure switch. These devices look
similar and they must be reinstalled in their original location.
12.7 Flow Sensor
WARNING! Arc flash and electric shock hazard. Open all local and remote electric power supply disconnect
switches, verify with a voltmeter that power is Off, and wear appropriate, OSHA approved personal
protective equipment (PPE) per NFPA 70E before working within the electric control enclosure. Failure to
comply can cause serious injury or death. Customer must provide earth ground to unit, per NEC, CEC, and
local codes, as applicable. Before proceeding with installation, read all instructions, verify that all the parts
are included, and check the nameplate to be sure the voltage matches available utility power. The Vertiv™
Liebert® iCOM™ controller does not isolate power from the unit, even in the Unit Off mode. Some internal
components require and receive power even during the Unit Off mode of the Liebert® iCOM™ controller. The
factory supplied, optional disconnect switch is inside the unit. The line side of this switch contains live high
voltage. The only way to ensure that there is NO voltage inside the unit is to install and open a remote
disconnect switch. Refer to unit electrical schematic. Follow all local codes.
WARNING! Risk of electric shock. Can cause serious injury or death. Building and equipment damage may also
result. Open all local and remote electric power supply disconnect switches and verify that power is off with a
voltmeter before working within any electric connection enclosures. The Liebert® iCOM™ controller does not
isolate power from the unit, even in the "Unit Off" mode. Some internal components require and receive power
even during the "unit off" mode of the Liebert® iCOM™ controller.
Installation, service, and maintenance work must be performed only by properly trained and qualified
personnel and in accordance with applicable regulations and manufacturers’ specifications. Opening or
removing the covers to any equipment may expose personnel to lethal voltages within the unit even when it is
apparently not operating and the input wiring is disconnected from the electrical source.
CAUTION: Risk of contact with extremely hot or cold surfaces. Can cause injury. Verify that all components
have reached a temperature that is safe for human contact or wear appropriate, OSHA-approved PPE before
working with the electric connection enclosures or unit cabinet. Perform maintenance only when the system
is de-energized and component temperatures have become safe for human contact.
12 Maintenance Proprietary and Confidential ©2024 Vertiv Group Corp. 97
Vertiv™ CoolPhase CDU Installer/User Guide
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