24 Chapter 2 Mechanical Installation
Table 2-4 Specifications of indoor unit mounting base
Item Specification Remark
Steel plate 100mm × 100mm × (5 ~ 6.5)mm -
Angle steel 40mm × 40mm × 3mm -
Top Thickness: 3mm ~ 5mm Supplied by others
Lateral Thickness: 2mm ~ 3mm Supplied by others
Rubber
cushion
Bottom Thickness: 10mm ~ 12mm Supplied by others
Installation hole of
anchor bolt
- Install the bolts according to your requirement
One-bay
Two-bay
H
Three-bay
H = 200mm (upflow unit)
H ≥ 300mm (downflow unit of
forward curved fan)
H ≥ 325mm (downflow unit of EC
fan)
1. Only three-bay unit needs the middle support (front and rear).
2. The upflow unit does not need the flow deflector.
3. The H dimension here is only for reference, and should be
determined according to user’s actual requirement while
making the base
Note:
The external side boards of the unit cannot bear weight. Take the mounting base into consideration while selecting angle steels
and fixing holes. For the downflow unit used EC fan, the minimum floor height requirement must be met
2.5 Installing Outdoor Unit
This outdoor unit is only applicable to the air-cooled series air conditioner. For detailed installation, refer to Liebert.PEX
Condenser User Manual.
2.6 Piping
2.6.1 Piping For Air-Cooled Unit
All joints of the cooling pipes must be silver-brazed. Standard industry procedures must be followed in selecting, laying,
and fixing the pipes, and evacuating the system and charging refrigerant. Take pipeline pressure drop, oil return to the
compressor and minimization of noise and vibration into consideration during design and construction.
General
The recommended pipe sizes are ‘equivalent lengths’ (see Table 2-6 for equivalent lengths of partial components),
with the resistance caused by bends taken into account. The installer should confirm that the sizes are appropriate for
the site conditions.
1. If the one-way equivalent length exceeds 30m, or if the vertical distance between indoor unit and outdoor unit
exceeds the values in Table 2-5, consult Emerson before installation to confirm whether a pipe extension kit is needed.
Table 2-5 Vertical distance between indoor unit and outdoor unit
Relative position altitude difference
Outdoor unit higher than indoor unit Max.: +20m
Outdoor unit lower than indoor unit Max.: -5m
2. The pipe sizes recommended in Table 2-6 are ‘equivalent lengths’, with the resistance caused by bends and valves
taken into account. The installer should confirm that the sizes are appropriate for the site conditions.
Table 2-6 Equivalent lengths of partial components
Equivalent length (m)
Outer Diameter (OD) of
liquid pipe (inch)
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
Liebert.PEX2 Series Air Conditioner User Manual
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