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The unit provides the humidifier with a 3/4" water supply pipe connector fitting. The rated water supply pressure range
is 100kPa ~ 700kPa.
A shut-off valve should be installed on this pipe outside the unit to isolate the humidifier upon maintenance.
2.7 Removing Transportation Fastener And Vibration Absorber
To protect partial components from damaging and distorting due to bumping, impact and resonation, fasteners and
vibration absorbers are mounted at certain locations before delivery. Remove the fasteners and vibration absorbers
before the installation and commissioning.
Removing transportation fixing plate of compressor
To reduce the compressor operation vibration and noise, the vibration absorbing cushions are added to the
compressor base. However, such method cannot best restrain the equipment vibration during transportation, and may
result in loosened connections and wearing of certain parts. To prevent this, three L shaped fixing plates are added to
the compressor base, as shown in Figure 2-15.
After the installation and before commissioning, remove the three L shaped fixing plates, and then restore the bolts
and washers. The fastening torque of the bolts is (12 ± 1) N.m.
2.8 Adding Refrigerant For Long Pipe System
The Liebert_DM AC has been charged with appropriate refrigerant before delivery. If the connecting pipe between the
indoor unit and the outdoor unit is longer than 10m, add refrigerant to the system in order to ensure 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)
See Table 2-6 for the adding refrigerant amount per meter of liquid pipe.
Figure 2-14 Humidifier water supply pipe connector of standard series indoor unit
Figure 2-15 Positions of fixing plates
New Liebert_DM Series Air Conditioner User Manual
Chapter 2 Mechanical Installation
橡胶密封圈
Rubber gland
Water supply pipe
进水管接头（3/4"）
connector (3/4")
固定钣金（共3个）
L shaped fixing plates (3 pcs)
Fixing plates (3 pcs)
15
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