Vertiv | Liebert® DM | User Manual 42
Mechanical Installation
• Ensure that the refrigerant charging into the refrigeration system is in a liquid state.
• After the refrigerant charging is completed, do not turn on the unit immediately to avoid any damage to the
compressor with liquid.
• After the mechanical installation, electrical installation, and pre-commissioning inspection of the unit is
completed, the unit is turned on and the unit system is dynamically charged with liquid refrigerant.
• For your personal health, please wear earmus or earplugs and other equipment to protect your hearing
after entering the computer room.
• If the unit is equipped with low-temperature components, the cooling capacity will be subjected to the
actual site of the project. Turn on the unit and charge the unit system with refrigerant until there is no air
bubbles in the sight glass, the system supercooling degree reaches 6 K and the suction superheat degree
reaches 8 K.
• Check the compressor suction line to ensure that the piping and compressor housing are free of
condensation to prevent liquid flood back issues.
2.8.2. Adding Refrigerant For Long Piping System
Under the condition of the standard pipe length (within 10 m), the Liebert® DM series air conditioner can be charged with
reference to the recommended refrigerant charging amount. If the connecting pipe between the indoor and the outdoor
units is longer than 10 m in actual installation, then add refrigerant to the system in order to ensure the normal system
operation according to the following formula:
Adding refrigerant amount (kg) = Adding refrigerant amount per meter of liquid pipe (kg/m) × Total length of extended
liquid pipe (m).
Refer Table 2-12 for the adding refrigerant amount per meter of liquid pipe.
Total length of extended liquid pipe (m) = Total length of liquid pipe - 5 m (for 07 kW/12 kW/17 kW)
Total length of extended liquid pipe (m) = Total length of liquid pipe - 7.5 m (for 22 kW/27 kW)
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