APPLICATION GUIDELINES | 83
Application Guidelines
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REFRIGERANT PIPING DESIGN
Design Guideline Summary
Table 55:
Single Zone Mega, Standard Efficiency, and Mega 115V Wall Mount Refrigerant Piping System Limitations.
Figure 41: 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, Standard Efficiency, or Mega 115V refrigerant pipe system. Refer to the
figure at right for maximum length and elevation of piping.
Model Numbers
LS090HEV2, LS120HEV2,
LS090HFV3, LS120HFV3
LS180HEV2, LS240HEV2,
LS180HFV3, LS240HFV3
LS090HXV2, LS120HXV2
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
9.8
Distance between fittings
and indoor units or outdoor
units
≥20 inches
≥20 inches
≥20 inches
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
