Vertiv Liebert MCM080 - 5.7 System Charging with Liebert MC; 5.7.1 Liebert MC Charging, Units with Liebert Lee-Temp Receivers

Line Size O.D., in.
R-407C, lb/100ft. (kg/30m) R-410A, lb/100ft. (kg/30m)
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) —
1. Data based on 50°F Evap 15°F superheat 125°F SCT 10°F subcooling
2. Source: DPN003099, Rev. 0
Table 5.8 Interconnecting piping refrigerant charge for self-contained DX units with remote
condenser
5.4 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.
Vertiv™ recommends adding a discharge line check valve and crankcase heater when connecting the
Liebert 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 Liebert MC condensers.
5.5 Refrigerant Oil Addition Procedures
Consult the user manual for the indoor unit to determine whether additional oil is required for each circuit.
Factors such as compressor, condenser type, piping lengths, receiver and total circuit refrigerant charge
influence this requirement.
5.6 System Dehydration/Leak Test
Procedures for leak check and evacuation of the entire refrigeration system are contained in the indoor
unit’s installation manual. Use the proper manual section corresponding to the winter control system used
on the condenser (with or without Liebert Lee-Temp™ or Liebert DSE™ receivers) and the refrigerant to
be charged into the system.
5.7 System Charging with Liebert MC
5.7.1 Liebert MC Charging, Units with Liebert Lee-Temp
™
Receivers
Consult the indoor unit’s manual for charging systems with Liebert Lee-Temp receivers. These
procedures will be identical to systems with fin/tube condenser coils, but the refrigerant volumes will be
much lower. Consult Table 5.5 on page75 and Table 5.6 on page76 for refrigerant required by a
condenser with Liebert Lee-Temp.
Vertiv | Liebert® MC™ Installer/User Guide | 78