Technical Specifications

Heat Rejection
109
6.5.1 Liebert XDC DX R-407c Circuit Volume
NOTICE
Risk of improper lubrication. May cause equipment damage.
Liebert XDCs’ refrigerant R-407c circuits with refrigerant charges over 55 lb (24.9 kg) require
additional oil. See Figure 109 for the amount required for various charge levels.
Once the system has been fully charged with refrigerant, use a hand pump to add the
additional oil at the suction side of the system while the system is running.
The amount of oil added by field service must be recorded on a tag attached at the tandem the
amount added along with the date it was added. This will be documented on a tag located at
the tandem compressor and marked “Oil Added Field Service Record.” Refer to the Liebert
XDC user manual, SL-16674, available at Liebert’s Web site,
www.liebert.com
Figure 109 Additional oil requirements for refrigerant charge
To calculate the oil required, use the following formula:
Additional Oil Required per Circuit = (Refrigerant Charge * 0.4 - 22)
Enter the refrigerant charge in pounds to determine the oil required in ounces
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 polyol ester (POE) and mineral-based oils.
• Do not mix oils of different viscosities.
Consult Emerson or the compressor manufacturer if questions arise.
6.6 Liebert Drycoolers
The Liebert drycooler is a low-profile, direct-drive propeller fan-type air cooled unit. Constructed with
an aluminum cabinet and a copper-tube aluminum fin coil, the unit is quiet and corrosion resistant.
All electrical connections and controls are enclosed in an integral NEMA 3R rated electrical panel
section of the drycooler.
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0
0 100 300200 400
Additional Oil Required Per Circuit, Ounces
Each circuit contains ZRT250KCE Tandem
XDC160 System Refrigerant Field Charge Per Circuit, Pounds