16 Chapter3 Mechanical Installation
Liebert. PEX+Series Precision Air Conditioner User Manual
Connecting the pipes of electrode humidifier (for the unit that uses electrode humidifier)
Requirements for connecting water inlet pipe of electrode humidifier:
1. Water inlet pipe uses
3/4”G screw-threaded connection pipe.
2. Water filter and water quality detection are recommended to prevent the water quality from affecting the normal
operation of humidifier.
3.6.4 Connecting copper pipes (discharge pipe and liquid pipe) between indoor unit and condenser
1. Select the size of connection pipes of the indoor unit. 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 3-7, or consult the technicians in local Emerson office.
2. Connect the copper pipes in welding mode. The connection ball valves of the discharge pipe and liquid pipe of
indoor unit are shown in Figure 3-12. Many notes and instruction labels are pasted onto the base and side panel
close to the ball valve.
Note that the ball valve must be wrapped with a wet cloth before welding to protect the label
from burned during the welding operation.
3. Connect the discharge pipe and liquid pipe of indoor unit according to the instructions on the label.
4. Horizontal sections of the discharge pipe 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 insulated where they are routed in the
conditioned space (including under a raised floor).
warning
！
The exposure time of system pipes do not exceed 15min. Longer exposure will lead to the compressor
refrigeration oil being affected with moisture, which can affect the life of the key components and the system
operation stability.
Ball valve of liquid pipe
Ball valve of gas pipe
Ball valve of liquid pipe
Ball valve of gas pipe
Single system
Dual system
Figure 3-12 Locations of discharge pipe and ball valve in liquid pipe
Table 3-7 Recommended pipe sizes
Recommended pipe sizes (unit: mm)
Model
P1020
single system
P1025
single system
P1030
single system
P1035
single system
P1040
single system
P1040
dual system
Pipe
length
D
L
D
L
D
L
D
L
D
L
D
L
10m
22
13
22
13
22
16
22
16
22
16
22
13
20m
22
13
22
13
22
16
22
16
22
16
22
13
30m
22
13
22
13
25
16
25
16
25
19
22
13
40m*
22
16
22
16
25
19
25
19
25
19
22
16
50m*
22
16
22
16
25
19
28
19
28
19
22
16
60m*
22
16
22
16
25
19
28
19
28
19
22
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