LG LC187HV, Engineering Manual, Page: 54 / 76

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 34: Single-Zone Four-Way Ceiling Cassette Refrigerant Piping System Limitations.
System Model Name
LC187HV, LC247HV LC367HV, LC427HV
Pipe Length
(ELF = Equivalent Length of Pipe)
Longest total equivalent piping length
164 feet 246 feet
Distance between fittings and indoor or outdoor units
≥20 inches ≥20 inches
Elevation
(All Elevation Limitations are
Measured in Actual Feet)
If outdoor unit is above indoor unit
98 feet 98 feet
If outdoor unit is below indoor unit 98 feet 98 feet
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 34: Typical LC187HV and LC247HV System Layout.
Figure 35: Typical LC347HV and LC427HV System Layout.
Outdoor unit
Indoor unit
A
B
Outdoor unit
Indoor unit
A
B
98
98
246
Max Length = A
Max Elevation = B
246
Unit = Feet
Due to our policy of continuous product innovation, some specifications may change without notification.
© LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
54 | duct (HIGH StatIc)
Ceiling-Concealed Duct (High Static) System Engineering Manual