Vertiv Liebert MCM080 - System Refrigerant Pressures; Additional Oil Requirements; Equipment Application Guidelines; System Dehydration;Leak Test

Line Size O.D., in.
R-407C R-410A
Hot Gas Line Liquid Line Hot Gas Line Liquid Line
3/8 — 3.6 (1.6) — 3.2 (1.4)
1/2 0.5 (0.2) 6.7 (3.0) 0.7 (0.3) 5.9 (2.7)
5/8 0.8 (0.4) 10.8 (4.8) 1.1 (0.5) 9.6 (4.3)
3/4 1.2 (0.5) 16.1 (7.2) 1.6 (0.7) 14.3 (6.4)
7/8 1.7 (0.8) 22.3 (10.0) 2.3 (1.0) 19.8 (8.8)
1-1/8 2.9 (1.3) 38.0 (17.0) 3.9 (1.7) 33.8 (15.1)
1-3/8 4.4 (2.0) 57.9 (25.9) 5.9 (2.6) 51.5 (23.0)
1-5/8 6.2 (2.8) — 8.4 (3.7) —
Data based on 50°F Evap, 15°F superheat, 125°F SCT, 10°F sub-cooling
Source: DPN002411, Rev. 8
Table 5.7 Interconnecting Piping Refrigerant Charge, lb/100ft.
(kg/30m)
5.1.4 System Refrigerant Pressures
Maximum Design Operating Pressure (High Side)
R-407C R-401A
Noted on the unit serial tag.
364 psig 2510 kPa 530 psig 3655 kPa
Table 5.8 System Refrigerant Pressures
5.1.5 Additional Oil Requirements
Refer to the indoor unit's installer/user guide to determine if additional oil is required for each circuit. The need for
additional oil is affected by compressor type, piping lengths, receiver, and total refrigerant charge.
5.2 Equipment Application Guidelines
Pump down must be disabled on the indoor unit when using the Liebert® MC condenser, due to the reduced volume in the
condenser coil.
We recommend adding a discharge line check valve and crankcase heater when connecting the MC condenser to Liebert®
indoor units built before 2012. The check valve and crankcase heater are needed for compressor protection. Additional
liquid line Schrader ports are required at the indoor unit to properly charge systems with MC condensers.
5.3 System Dehydration/Leak Test
Refer to the indoor unit's installer/user guide for the leak check and evacuation procedures for the entire thermal
management system. Refer to the section regarding the winter control system used on the condenser.
5.4 Charging for Condensers with Liebert® Lee-Temp Receivers
Consult the indoor unit’s installer/user guide for charging systems with Liebert® Lee-Temp receivers. These procedures are
identical to systems with fin/tube condenser coils, but the refrigerant volumes will be much lower.
5 Piping
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