Refrigerant Piping Design - LG Mega LS090HEV2 Engineering Manual
Single zone mega and mega 115v wall mounted
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Also See for Mega LS090HEV2:
- Engineering manual (85 pages) ,
- Installation manual (79 pages) ,
- Installation manual (72 pages)
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REFRIGERANT PIPING DESIGN
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. The
table below lists pipe length limits that must be followed in the design of a Single
Zone Mega or Mega 115V refrigerant pipe system. Refer to the figure at right for
maximum length and elevation of piping.
Table 40: Single-Zone Mega and Mega 115V Wall Mount 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 41: Single Zone Mega and Mega 115V Piping System Additional Refrigerant Charge.
Model Numbers
Mega
LS090HEV2
(LSN090HEV2 / LSU090HEV2)
LS120HEV2
(LSN120HEV2 / LSU120HEV2)
LS180HEV2
(LSN180HEV2 / LSU180HEV2)
LS240HEV2
(LSN240HEV2 / LSU240HEV2)
Mega 115V
LS090HXV
(LSN090HXV / LSU090HXV)
LS120HXV
(LSN090HXV / LSU090HXV)
• 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.
68 | APPLICATION GUIDELINES
LS090HEV2, LS120HEV2
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
0
Additional
0
Refrigerant
0
Charge (oz.)
0
Additional
0
Refrigerant
0
Charge (oz.)
©
Figure 39: Mega and Mega 115V System Layout.
Max Length = A
Max Elevation = B
LS180HEV2, LS240HEV2
3/8 inches
1/4 inches
24.6
24.6
49.2
9.8
23 feet
23 feet
0.22
Refrigerant Piping Length (ft.)
24.6
32.8
41.0
49.2
0
1.8
3.6
5.4
0
1.8
3.6
5.4
0
2.1
4.3
6.4
0
2.1
4.3
6.4
0
1.8
3.6
5.4
0
1.8
3.6
5.4
Indoor unit
A
B
Indoor unit
Outdoor unit
LS090HXV, LSU120HXV
1/2 inches
1/4 inches
24.6
24.6
65.6
9.8
32.8 feet
32.8 feet
0.26
65.6
82.0
98.4
114.8 131.2 147.6 164.0
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10.7
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10.7
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Unit = Feet
Outdoor unit
A
B
3/8 inches
1/4 inches
24.6
24.6
49.2
6.6
23 feet
23 feet
0.22
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