LG Multi V mini Engineering Manual page 72

PIPING DESIGN GUIDE
Routing / Protecting Refrigerant Pipe
Power cables and low voltage control wiring should be separated a minimum of 2 inches to avoid Electro-Magnetic Field
Note:
(EMF) effects on communications. See Figure 49 and Figure 50.
When placing multiple outdoor units in the same vicinity, a multiple tier pipe/cable tray similar to the one shown in Figure 50 may be a good
option. Position refrigerant pipe, power cables, and communication cables so they do not impede walking access to the unit or the removal of
service access panels. Best practice dictates that insulated piping and cables should be properly supported and protected from natural ele-
ments to prevent deterioration. Place pipes, cables, and wires in a cable/pipe tray equipped with a removable weather tight cover. Consider
"Copper Expansion and Contraction" on page 70.
The minimum size wall sleeve or utility conduit should be sized using the data in Table 28, local code, and NEC regulations. Size using the
most conservative data.
Figure 49: Single outdoor unit—suggested arrangement of
refrigerant pipe and cable
A
Power Cable
A Power Cable
B Liquid Line
B Liquid Line
C Vapor Line
C
Vapor Line
D Control Wire(s)
D
Control Wire(s)
Minimum Spacing Required
(See Table 29)
Min.2"
D
C
B
A
Min.8"
Covered Pipe
Max.4"
& Cable Tray
Handling Obstacles
When an obstacle, such as an I-Beam or Concrete T, is in the path of the planned refrigerant pipe run, it is best practice to route the pipe
over the obstacle. If adequate space is not available to route the insulated pipe over the obstacle, route the pipe under the obstacle. In ei-
ther case, it is imperative the horizontal section of pipe above or below the obstacle be a minimum of 3 times greater than the longest vertical
rise (or fall) distance.
Figure 51: Installing piping above and below an obstacle
a. Above an obstacle
74 SYSTEM ENGINEERING
|
Min.8"
3X
b. Below an obstacle
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Figure 50: Multiple outdoor unit installation—suggested arrangement
of refrigerant pipe and cables using a multi-tier tray system
E
Power Cable
E
Power Cable
F Control Wiring
F Control Wiring
Refrigerant Piping
G
G Refrigerant Piping
E G
F
Minimum Spacing Required
Min 2"
(See Table 29)
Pipe rack with cover