REFRIGERANT PIPING DESIGN
Design Guideline Summary
Device Connection Limitations
A single-zone four-way ceiling cassette system consists of one outdoor unit and one indoor unit. One of the most critical elements of a
single-zone four-way ceiling cassette system is the refrigerant piping. The table below lists pipe length limits that must be followed in the
design of a single-zone four-way ceiling cassette refrigerant pipe system.
Table 37: Single-Zone Four-Way Ceiling Cassette Refrigerant Piping System Limitations.
System Model Name
LC097HV4, LC127HV4 LC187HV, LC247HV LC367HV, LC427HV
Pipe Length
(ELF = Equivalent
Length of Pipe)
Longest total equivalent piping length
66 feet 164 feet 246 feet
Shortest total equivalent piping length
6.6 6.6 6.6
Distance between fittings and indoor or
outdoor units
≥20 inches ≥20 inches ≥20 inches
No additional refrigerant
24.6 feet 24.6 feet 24.6 feet
Elevation
(All Elevation Limitations are
Measured in Actual Feet)
If outdoor unit is above indoor unit
49 feet 98 feet 98 feet
If outdoor unit is below indoor unit
49 feet 98 feet 98 feet
Additional Refrigerant Needed (oz/ft)
0.22 0.43 0.43
DFS System Layout
Outdoor unit
Indoor unit
A
B
Outdoor unit
Indoor unit
A
B
98
98
164
Max Length = A
Max Elevation = B
164
Unit = Feet
Figure 44: Typical LC097HV4 and LC127HV4 System Layout. Figure 45: Typical LC187HV and LC247HV System Layout.
Outdoor unit
Indoor unit
A
B
Outdoor unit
Indoor unit
A
B
49
49
66
Max Length = A
Max Elevation = B
66
Outdoor unit
Indoor unit
A
B
Outdoor unit
Indoor unit
A
B
98
98
246
Max Length = A
Max Elevation = B
246
Figure 46: Typical LC347HV and LC427HV System Layout.
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
64 | FOUR-WAY CASSETTE
Four-Way Ceiling Cassette System Engineering Manual
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