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8.1 General Maintenance
WARNING! Arc flash and electric shock hazard. Open all local and remote electric power
disconnect switches, verify with a voltmeter that power is Off and wear personal protective
equipment (PPE) per NFPA 70E before working within the electric control enclosure. Failure to
comply can cause serious injury or death. The Liebert® 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 controller. 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.
NOTICE
Risk of compressor slugging. Can cause equipment damage.
Apply power to the condensing unit 8 hours before operating the system. This time is required
to drive liquid refrigerant out of the compressor. This is especially important at low ambient
temperatures. The compressor's crank-case heater is energized as long as power is supplied to
the unit.
Access the condensing unit by removing the unit housing panel.
•
Clean the air cooled condenser coil of all debris that will inhibit airflow. This can be done with
compressed air, with water from a garden hose, or with a commercial coil cleaner.
•
Check for bent or damaged coil fins and repair as necessary.
•
During winter, do not permit snow to accumulate on or around the condensing unit.
•
Check all refrigerant lines and capillaries for vibration isolation and support as necessary.
•
Check all refrigerant lines for signs of leaks.
8.2 Compressor Maintenance
8.2.1 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.
8.2.2 Replacement Compressors
Replacement compressors are available through your Vertiv sales office. If the unit is under warranty, the
replacement compressor must be obtained from and the original compressor returned to your local Vertiv
sales office. Compressors are shipped in reusable packaging, and the original compressor should be
returned in the same packaging.
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Table 8.1 Compressor oil types for R-410A Refrigerant
Compressor Type
Copeland Scroll and Digital Scroll POE Oil - ISO 32 Centistoke Viscosity
1. Use Copeland POE Oil ULTRA 32-3MAF or other Copeland-approved oils.
Source: DPN003950. Rev.5
Oil Type
1
Vertiv | Liebert® PFD™ Installer/User Guide
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