Design Guideline Summary; Selecting Field-Supplied Copper Tubing - LG LS090HEV1 Engineering Manual

REFRIGERANT PIPING DESIGN
Design Guideline Summary/Selecting Field-Supplied Copper Tubing
Device Connection Limitations
Single-zone systems consist of one outdoor unit and one indoor
unit. One of the most critical elements of a single zone system is
the refrigerant piping. Table 12 lists pipe length limits that must be
followed in the design of a Single Zone Art Cool Premier refrigerant
pipe system. Refer to Figure 30 for maximum length and elevation of
piping.
Table 12: Single-Zone Mega Wall Mount Refrigerant Piping System Limitations.
Pipe Length
(ELF = Equivalent Length of
pipe in Feet)
Elevation
(All Elevation Limitations are
Measured in Actual Feet)
Additional Refrigerant Needed (oz/ft)
Table 13: Linear Thermal Expansion of Copper Tubing in Inches
Pipe
Length
1
35° 40° 45°
10 0.04 0.04 0.05
20
0.08 0.08 0.10
30 0.12 0.12 0.15
40 0.16 0.16 0.20
50 0.20 0.20 0.25
60 0.24 0.24 0.30
Pipe length baseline temperature = 0°F. "Expansion of Carbon, Copper and Stainless Steel Pipe," The Engineers' Toolbox, www.engineeringtoolbox.com.
1
58 | REFRIGERANT DESIGN
Longest total equivalent piping length
Shortest total equivalent piping length
Piping Length (no additional refrigerant)
Distance between fittings and indoor or
outdoor units
If outdoor unit is above indoor unit
If outdoor unit is below indoor unit
50° 55° 60° 65° 70°
0.06 0.06 0.07 0.08 0.08
0.12 0.13 0.14 0.15 0.16
0.18 0.20 0.21 0.23 0.24
0.24 0.26 0.28 0.30 0.32
0.30 0.33 0.35 0.38 0.40
0.36 0.39 0.42 0.45 0.48
Due to our policy of continuous product innovation, some specifications may change without notification.
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Figure 30: Mega System Layout.
Max Length = A
Max Elevation = B
Indoor unit
A
B
LS090HEV1/
LS120HEV1
49.2 feet
9.8 feet
24.6 feet
≥20 inches
22.9 feet
22.9 feet
0.22
Fluid Temperature °F
75° 80° 85° 90° 95° 100° 105° 110° 115° 120° 125° 130°
0.09 0.09 0.10 0.10 0.11
0.17 0.18 0.19 0.20 0.21
0.26 0.27 0.29 0.30 0.32
0.34 0.36 0.38 0.40 0.42
0.43 0.45 0.48 0.50 0.53
0.51 0.54 0.57 0.60 0.63
A
Indoor unit
Outdoor unit
LS180HEV1/ LSU090HXV/
LS240HEV1
65.6 feet
9.8 feet
24.6 feet
≥20 inches
32.8 feet
32.8 feet
0.33
0.11 0.11 0.12 0.13 0.14
0.22 0.22 0.23 0.26 0.28
0.33 0.32 0.35 0.39 0.42
0.44 0.43 0.46 0.52 0.56
0.55 0.54 0.58 0.65 0.70
0.66 0.65 0.69 0.78 0.84
Unit = Feet
Outdoor unit
B
LSU120HXV
49.2 feet
6.6 feet
24.6 feet
≥20 inches
22.9 feet
22.9 feet
0.22
0.15 0.15
0.29 0.30
0.44 0.45
0.58 0.60
0.73 0.75
0.87 0.90