Vertiv | Liebert PEX+ Chilled Water | User Manual 31
Installation
• Vibration Absorption Treatment
Place a layer of rubber cushion on the top, side of the base and on the bottom of the steel plate respectively to
prevent transmission of vibration during operation of the unit. Refer Table 2-8 for more details.
Table 2-7 Dimensions of Rubber Cushion for Vibration Absorbing
Item Specification
Rubber
cushion (NBR)
Top Thickness: 3 mm to 5 mm
Lateral Thickness: 2 mm to 3 mm
Bottom Thickness: 10 mm to 12 mm
2.4.5. Installation of Indoor Unit
Liebert® PEX+CW indoor unit should be installed on the horizontal surface of mounting floor stand and ensure
that all indoor units are at the same level.
2.4.6. Pipe Installation Unit
There are three kinds of pipe to be joint as follows:
• Condensed drain piping connection of the indoor unit
• Water inlet pipe of humidifier connection
• Chilled Water inlet and outlet piping connection
2.4.7. Condensed Drain Piping Connection of Indoor Unit
The condensate of Infrared humidifier and evaporator coil are connected by a cross connector and drained
through the drain pipe, as shown in Figure 2-21; the material used for the drain pipe is ‘triple ethyl propylene
rubber (EPDM) rubber. The pipe outer diameter is 25 mm. If the drain pipe is used by three or more units, the
minimal pipe outer diameter should be 40 mm. For the unit with electrode humidifier the inner diameter of the
drain pipe is 40 mm.
When connecting the drain pipe, ensure that the U-bend is installed vertically and the ‘U’ shape is not distorted,
so that the condensate can be drained immediately and eectively.
Because the Infrared humidifier contains hot flowing water, the water pipe must be resistant to heat higher
than 90 °C.
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