Vertiv Liebert DSE500, Инструкция по установке и эксплуатации

Страница: 31 / 77

8.3.4 Removing Fan Assembly
Do not attempt to remove the fan assemblies without first contacting Vertiv Technical Support at 1-800-
543-2778.
8.4 Electronic Expansion Valve (EEV) Maintenance
The EEV controls superheat through the Liebert® iCOM™ controls by actively measuring suction
pressure via a transducer attached to the suction-line rotalock and suction temperature via a thermister
strapped to the suction line. The EEV actively adjusts the orifice size and resulting mass flow of refrigerant
to maintain the superheat setpoint (set in Liebert® iCOM). The EEV is used in place of the standard
thermal expansion valve (TXV).
WARNING! Risk of electric shock. Can cause serious injury or death. The Liebert® iCOM
microprocessor 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
control. Open all local and remote electric power disconnect switches and verify with a
voltmeter that power is Off before working on any component of the system.
NOTE: Intermittent loss of subcooling may result in EEV/superheat instability.
8.5 Compressor Maintenance
8.5.1 Compressor Oil
NOTICE
Risk of improper compressor lubrication. Can cause compressor and refrigerant system
damage.
Failure to use oil types, viscosities and quantities recommended by the compressor
manufacturer may reduce compressor life and void the compressor warranty.
• Do not mix polyolester (POE) and mineral-based oils.
• Do not mix oils of different viscosities.
• Consult Vertiv technical support or the compressor manufacturer if questions arise.
8.5.2 Rotalock Valve
WARNING! Risk of explosive discharge of high-pressure refrigerant. Can cause serious injury.
Neutral and service ports on the rotalock valve 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.
• The Neutral port remains open to the compressor side in all positions of the valve stem, Figure
8.3 on the next page. A high-pressure cut-out switch or low-pressure switch/transducer will
be connected to this port.
• The Service port is closed to the system when valve stem is back-seated, Figure 8.3 on the
next page. It is open to the system as soon as the valve is adjusted away from the back-seated
position.
8 Maintenance 31