Chapter 3 Mechanical Installation 17
Liebert.CRV+ Series Air Cooled Precision Air Conditioner User Manual
3.4.4 Connecting Copper Pipes Between Indoor Unit And Outdoor Unit
The indoor unit and outdoor unit are connected through welded copper pipes. Considering the effect of the pipe
diameter on the system pressure drop, the pipe diameter of the indoor unit and outdoor unit should be determined
according to the specifications listed in Table 3-4. Or you can consult Emerson office technicians for determining.
The unit has refrigerating pipe connectors and labels on its top and bottom, as shown in Figure 3-16 and Figure 3-17.
During welding, follow the label indication to connect the discharge pipe and the liquid pipe of indoor unit, and do not
have the labels burned. Horizontal sections of the discharge pipes should be sloped downward from the compressor,
with a slope of at least 1:200 (5mm down for each 1m run). The discharge pipes should be heat insulated where they
are routed in the conditioned space (under the raised floor included).
Note
For bottom piping, before welding the compressor discharge pipe and liquid pipe, follow the requirement
labeled on the copper pipe, use a cutter to cut off the copper pipe (a small quantity of compressor lubricating
oil may leak), and do not weld the copper cap on the seal directly lest the oil in the copper pipe should be
heated and catch fire.
The exposure time of system pipes should not exceed 15min. Over long time will lead to the POE
refrigeration oil being affected with damp. That can affect the life of the key components and the stability of
the system operation.
Table 3-4 Recommended pipe sizes (unit: mm)
Model
CR025
CR035
Pipe length
D
L
D
L
10m
16
12.7
19
16
20m
19
16
22
19
30m
22
16
25
19
40m*
22
16
25
19
50m*
22
19
25
22
Note:
1. A pipe extension kit is required for ‘Eq.Lgth’ marked with *.
2. D: discharge line, L: liquid line.
3. Consult Emerson if the pipe length exceeds 50m.
4. If the outdoor environment temperature is lower than -20°C, a low temperature kit is needed, please consult Emerson Network
Power Co., Ltd.
进水孔
排水孔
液管孔
排气管孔
进线孔
进线孔
Water inlet hole
Drainage hole
Liquid pipe hole
Discharge pipe hole
Cable entry hole
Cable entry hole
Figure 3-16 Top pipe connectors
