14 Chapter3 Mechanical Installation
Liebert. PEX+Series Precision Air Conditioner User Manual
3.4.4 Install Indoor Unit Cabinet
The indoor unit cabinet should be installed on the base horizontal plane, and keep the unit after installation in the
same horizontal plane, between the indoor unit and the base does not require welding or other rigid connections fixed
3.5 Installing Condenser
Refer to condenser user manual for condenser installation.
3.6 Piping For Air-Cooled Unit
Four kinds of pipes need to be installed: Condensate drain pipe of indoor unit, water inlet pipe of humidifier, copper
pipes between indoor unit and condenser (air cooled series) and extension kit (optional). When installing pipes, user
shall decide whether to use extension kit according to the conditions for selecting the kit.
Note
All joints of the cooling pipes must be silver-brazed.
3.6.1 Pipe Extension Kit (Optional)
Conditions for selecting extension kit
If the one-way equivalent length exceeds 30m, or if the vertical distance between indoor unit and condenser exceeds
the values in Table 3-6, consult Emerson before installation to confirm whether a pipe extension kit is needed. The
pipe sizes recommended are ‘equivalent lengths’, with the resistance caused by bends taken into account. See Table
3-5 for equivalent lengths of partial components, and the installer should confirm that the sizes are appropriate for the
site conditions.
Table 3-5 Equivalent lengths of partial components
Outer Diameter (OD) of liquid
pipe (inch)
Equivalent length (m)
90
° bend
45
° bend
T type three-way
3/8
0.21
0.10
0.76
1/2
0.24
0.12
0.76
5/8
0.27
0.15
0.76
3/4
0.3
0.18
0.76
7/8
0.44
0.24
1.1
1-1/8
0.56
0.3
1.4
Table 3-6 Vertical distance between indoor unit and condenser
Relative position
Altitude difference
Condenser higher than indoor unit
20m
Condenser lower than indoor unit
5m
Note
A trap should be installed for every 7.5m of vertical distance. Please consult Emerson for details.
3.6.2 Connecting condensate drain pipe of indoor unit
The condensate of infrared humidifier and evaporator is converged by a cross connector and drained through the drain
pipe, as shown in Figure 3-9. The pipe OD is 25mm. If the drain pipe is used by three or more units, the minimal pipe
OD should be 40mm. For the unit that uses electrode humidifier, the inner diameter of drain pipe is 40mm.
Note
When connecting the drain pipe, you must make sure tha
t the U bend is installed vertically and the ‘U’ shape is
not distorted, so as to ensure that the condensate can be drained immediately and effectively.
