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68 | APPLICATION GUIDELINES
Single Zone Mega Wall Mounted Engineering Manual
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REFRIGERANT PIPING DESIGN
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Table 40: Single-Zone Mega and Mega 115V Wall Mount Refrigerant Piping System Limitations.
Figure 39: Mega and Mega 115V System Layout.
Max Length = A
Max Elevation = B
Unit = Feet
Outdoor unit
Indoor unit
A
B
Outdoor unit
Indoor unit
A
B
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.
Model Numbers LS090HEV2, LS120HEV2 LS180HEV2, LS240HEV2 LS090HXV, LSU120HXV
Pipe Sizes
Vapor
3/8 inches 1/2 inches 3/8 inches
Liquid
1/4 inches 1/4 inches 1/4 inches
Pipe Length
(ELF = Equivalent Length of
pipe in Feet)
Standard Piping Length
24.6 24.6 24.6
Piping Length with No
Additional Refrigerant
24.6 24.6 24.6
Longest total equivalent
piping length
49.2 65.6 49.2
Shortest total equivalent
piping length
9.8 9.8 6.6
Distance between fittings
and indoor units or outdoor
units
LQFKHV LQFKHV LQFKHV
Elevation
(All Elevation Limitations are
Measured in Actual Feet)
If outdoor unit is above
indoor unit
23 feet 32.8 feet 23 feet
If outdoor unit is below
indoor unit
23 feet 32.8 feet 23 feet
Additional Refrigerant Needed (oz/ft)
0.22 0.26 0.22
Model Numbers
Refrigerant Piping Length (ft.)
16.4 24.6 32.8 41.0 49.2 65.6 82.0 98.4 114.8 131.2 147.6 164.0
Mega
LS090HEV2
(LSN090HEV2 / LSU090HEV2)
Additional
Refrigerant
Charge (oz.)
0 0 1.8 3.6 5.4 - - - - - - -
LS120HEV2
(LSN120HEV2 / LSU120HEV2)
001.83.65.4-------
LS180HEV2
(LSN180HEV2 / LSU180HEV2)
002.14.36.410.7------
LS240HEV2
(LSN240HEV2 / LSU240HEV2)
002.14.36.410.7------
Mega 115V
LS090HXV
(LSN090HXV / LSU090HXV)
Additional
Refrigerant
Charge (oz.)
001.83.65.4-------
LS120HXV
(LSN090HXV / LSU090HXV)
001.83.65.4-------
Table 41: Single Zone Mega and Mega 115V Piping System Additional Refrigerant Charge.
• 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.
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