Vertiv | Liebert® DM | User Manual 43
Mechanical Installation
Table 2-12 Amount of Refrigerant per Unit Length of Liquid Pipe (Unit: kg/m)
Liquid Pipe OD
inch (mm)
Adding Refrigerant Amount per Meter
(kg/m)
3/8 (9.53) 0.050
1/2 (12.7) 0.107
5/8 (16.0) 0.174
3/4 (19.0) 0.245
7/8 (22.2) 0.321
1-1/8 (28.6) 0.431
2.8.3. Long Connecting Pipe System with Lubricant Oil (RL32-3MAF)
The lubricant oil should be added during the installation. The lubricant oil used in the Liebert® DM air conditioner is given in
Table 2-13.
• A certain type of POE lubricant that is directly supplied by Vertiv must be used, otherwise the compressor
may be damaged. When charging the refrigeration system with oil, consult Vertiv representative for more
details on adding the lubricant oil.
• Adding inferior lubricant oil and incorrect type of lubricant oil will damage the compressor, so the quality
problems caused are not covered by the warranty.
• Do not use inferior quality refrigerant.
• For any consequences resulting from inferior quality refrigerant, Vertiv does not assume warranty
responsibility. Select the type of lubricant oil in accordance with the compressor manufacturer’s
recommendation.
Table 2-13 Amount of Lubricant Oil (RL32-3MAF)
Liquid Pipe Diameter (mm) Within 10 (m) >10 (m)
9.5
Do not add
lubricant oil
Amount of additional lubricant oil (ml) = Adding refrigerant
amount (kg) x 22.6
12.7
16.0
19.0
22.0
25.0
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