Piping For Ac Unit; General Principles - Liebert DM Series User Manual

Figure 2-10 Installation hole dimensions of Lee-Temp outdoor unit base (top view, unit: mm)
If multiple outdoor units need to be installed with one above the other, see Figure 2-11 to install them.

2.6 Piping for AC Unit

2.6.1 General Principles

1. Use copper pipes with quick thread connector to connect the indoor unit and the outdoor unit. If the pipe length
exceeds the standard pipe length (see Table 2-1) and straight copper pipe is used, piping joints must be brazed.
2. Follow standard industry procedures in selection and placement of pipe, system evacuation and charging with
refrigerant (only when pipeline is too long). The standard refrigerant of the AC unit is R22.
3. Give considerations to pipeline pressure drop, oil return to the compressor, to avoid oil leakage and clogging in
parts of the system and minimize noise and vibration to the greatest extend.
4. Consult Emerson before installation on whether measures such as using extended piping kit are needed, if the
equivalent length exceeds 50m, or if the vertical distance between the indoor unit and the outdoor unit exceeds the
values in Table 2-3.
Outdoor unit installed higher than indoor unit
Outdoor unit installed lower than indoor unit
680
4m
Note:
1. Use 5# angle iron for bracket, when
two units are installed with one above
the other.
2. Use 6.5# channel steel for bracket, when
three units are installed with one above the
other.
Figure 2-11 Installing multiple outdoor units with one above the other
Table 2-3 Vertical distance between indoor unit and outdoor unit
Relative position
New Liebert_DM Series Air Conditioner User Manual
Chapter 2 Mechanical Installation
1037
R6
Airflow
Out-
Airflow door
unit
50mm
Min. 50mm
Base
0.5m
Out-
door
unit
Bracket
50mm
Outdoor unit base
Value
Maximum: 20m
Maximum: 5m
11