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APPLICATION | 73
Application Guidelines
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REFRIGERANT PIPING DESIGN
Device Connection Limitations
A single-zone system consists of one outdoor unit and one indoor unit. One of the most critical elements of a single-zone system is the
refrigerant piping. If the connection piping is not within allowable limits, there will be reliability, performance, noise, and vibration issues.
The table below lists pipe length limits that must be followed in the design of a Single Zone LGRED Four-Way Ceiling-Cassette refrigerant
pipe system. See paragraph below for calculating additional refrigerant charge necessary for longer piping lengths. Refer to the figures for
maximum length and elevation of piping.
Table 55: Single-Zone Four-Way LGRED Ceiling Cassette
Refrigerant Piping System Limitations.
System Model Name
LC188HHV4, LC249HHV LC369HHV, LC429HHV, LC489HHV
Pipe Sizes
Vapor
5/8 5/8
Liquid
3/8 3/8
Pipe Length
(ELF = Equivalent
Length of Pipe)
Standard length (no add’l refrigerant)
24.9 feet 24.9 feet
Longest total equivalent piping length
164 feet 246 feet
Shortest total equivalent piping length
16.4 16.4
Distance between fittings and indoor or
outdoor units
LQFKHV LQFKHV
Elevation
(All Elevation Limitations are
Measured in Actual Feet)
If outdoor unit is above indoor unit
98.4 feet 98.4 feet
If outdoor unit is below indoor unit
98.4 feet 98.4 feet
Additional Refrigerant Needed (oz/ft)
0.43 0.43
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 52: Typical LC188HHV4 and LC249HHV 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
Figure 53: Typical LC369HHV, LC429HHV, and LC489HHV System
Layout.
Additional Refrigerant Charge
Each outdoor unit is factory charged (nameplate charge) for the evaporator as well as a standard 24.9 foot line. Any time a line set is used
longer then the standard 24.9 foot line set length, the refrigerant charge has to be adjusted.
The charge must be adjusted on 0.43 oz. of R410A per foot based on how many feet of piping are added. The factory charge
accommodates pipe lengths up to the standard length without requiring refrigerant removal.
Example:
A 50 foot line set is used -- 25.1 additional feet x 0.43 oz. per foot. = Add 10.79 oz. of R410A.
If the unit charge is unknown, reclaim, evacuate and weigh in the correct charge using the unit nameplate (capacity) charge adjusting for line sets
longer than 24.9 ft. This will prevent any interruptions to the functioning of the unit and possible damage.
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