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54 | REFRIGERANT DESIGN
Single Zone Wall Mounted Extended Piping Engineering Manual
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REFRIGERANT PIPING DESIGN
Design Guideline Summary
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
Extended Piping Wall Mounted refrigerant pipe system. Refer to the figure for
maximum length and elevation of piping.
• 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).
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Table 30: Single Zone Extended Piping Wall Mounted Refrigerant Piping System Limitations.
Model Numbers
LS243HLV3 LS303HLV3 LS363HLV3
Pipe Sizes
Vapor
5/8 inches 5/8 inches 5/8 inches
Liquid
3/8 inches 3/8 inches 3/8 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
164.0 164.0 164.0
Shortest Total Equivalent Piping Length
9.8 9.8 9.8
Distance between fittings and indoor units or outdoor units
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Elevation
(All Elevation Limitations are
Measured in Actual Feet)
If outdoor unit is above indoor unit
98.4 98.4 98.4
If outdoor unit is below indoor unit
98.4 98.4 98.4
Additional Refrigerant Needed (oz./ft)
0.38 0.38 0.38
Figure 36: Single Zone Extended Piping Wall Mounted
System Layout.
Outdoor unit
Indoor unit
A
B
Outdoor unit
Indoor unit
A
B
Max Length = A
Max Elevation = B
Unit = Feet
Model Numbers
Refrigerant Piping Length (feet)
16.4 24.6 32.8 41 49.2 65.6 82 98.4 114.8 131.2 147.6 164.0
LS243HLV3
(LSN243HLV3 / LSU243HLV3)
Additional
Refrigerant
Charge (oz.)
0 0 3.1 6.2 9.3 15.6 21.8 28.0 34.3 40.5 46.7 53.0
LS303HLV3
(LSN303HLV3 / LSU303HLV3)
0 0 3.1 6.2 9.3 15.6 21.8 28.0 34.3 40.5 46.7 53.0
LS363HLV3
(LSN363HLV3 / LSU363HLV3)
0 0 3.1 6.2 9.3 15.6 21.8 28.0 34.3 40.5 46.7 53.0
Table 31: Single Zone Wall Mounted Extended Piping Additional Refrigerant by Piping Length (oz.).
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