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Device Connection Limitations
A single-zone system consists of one outdoor unit and one indoor
unit. One of the most critical elements of a single-zone system is
the refrigerant piping. If the connection piping is not within allowable
limits, there will be reliability, performance, noise, and vibration
issues. Table 29 below lists pipe length limits that must be followed
in the design of a Single Zone High Efficiency Wall Mount refrigerant
pipe system, and Table 30 includes additional refrigerant charge
necessary for longer piping lengths. Refer to the figure for maximum
length and elevation of piping.
Table 29: Single Zone High Efficiency Refrigerant Piping System Limitations.
Model Numbers
Pipe Sizes
Pipe Length
(ELF = Equivalent Length of
pipe in Feet)
Elevation
(All Elevation Limitations are
Measured in Actual Feet)
Additional Refrigerant Needed (oz/ft)
Table 30: Single Zone High Efficiency Refrigerant Piping System Additional Refrigerant Charge.
Model Numbers
LS090HSV5
(LSN090HSV5 / LSU090HSV5)
LS120HSV5
(LSN120HSV5 / LSU120HSV5)
LS180HSV5
(LSN180HSV5 / LSU180HSV5)
• Capacity is based on standard length.
• Equivalent Pipe Length = Actual Pipe Length + Number of Bends x 0.3.
• Additional Refrigerant Charge Calculation : X (g) = [ (Refrigerant Pipe Length) - (No Charge Pipe Length) ] × (Additional Refrigerant).
• There is no need to add refrigerant if equivalent pipe is less than the "piping length with no additional refrigerant" in the table above.
Vapor
Liquid
Standard Piping Length
Piping Length with No
Additional Refrigerant
Longest total equivalent
piping length
Shortest total equivalent
piping length
Distance between fittings
and indoor units or outdoor
units
If outdoor unit is above
indoor unit
If outdoor unit is below
indoor unit
16.4
24.6
0
Additional
Refrigerant
0
Charge (oz.)
0
Due to our policy of continuous product innovation, some specifications may change without notification.
©
LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
REFRIGERANT PIPING DESIGN
Figure 33: Single Zone High Efficiency Wall Mount System Layout.
Indoor Unit
B
LS090HSV5
(LSN090HSV5/
LSU090HSV5)
Ø3/8
Ø1/4
24.6
41
82
9.8
≥20 inches
49.2
49.2
0.22
Refrigerant Piping Length (ft.)
32.8
41.0
49.2
65.6
0
0
0
1.8
5.4
0
0
0
1.8
5.4
0
3.1
6.2
9.3
15.6
Design Guideline Summary
A
A
Indoor Unit
Outdoor Unit
LS120HSV5
(LSN120HSV5/
(LSN180HSV5/
LSU120HSV5)
LSU180HSV5)
Ø3/8
Ø1/4
24.6
41
82
9.8
≥20 inches
49.2
49.2
0.22
82.0
98.4
114.8 131.2 147.6 164.0
9.0
-
-
9.0
-
-
21.8
28.0
34.3
Outdoor Unit
B
LS180HSV5
Ø5/8
Ø3/8
24.6
24.6
114.8
9.8
≥20 inches
49.2
49.2
0.38
-
-
-
-
-
-
-
-
-
APPLICATION | 55
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