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The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations.
avoid Pipe Damage
• When routing field-provided piping inside the Space II unit frame, avoid causing vibration
that will damage the components.
• Correctly route the piping so it does not make contact with the compressor casing, terminal
cover, or mounting bolts. Allow room for field installation.
• Properly insulate all refrigerant pipes separately up to the service valve body inside the
confines of the unit frame.
Refrigerant piping can be connected through the access holes on the front panel of the Multi V
Space II frame.
• Use nitrogen at 3 psi flow during welding.
• If nitrogen was not used during welding, oxidized contaminants may build inside the piping
and effect valve and condenser operation.
Table 14: Space II Unit Refrigerant Pipe Connections (All Brazed Type).
Model
Liquid Conn. (inches)
ARUN053FG2
space II unit Pipe routing
1. Remove the leak-prevention cap.
2. Check if the liquid and vapor pipes
are fully locked.
3. Vacuum out any remaining refriger-
ant or air through the service port.
Device connection limitations
• The minimum number of connected and operating indoor units to Multi V Space II
systems is one (1), taking into consideration the minimum combination ratio.
• The maximum number of indoor units on a Multi V Space II unit is nine (9).
One of the most critical elements of a Multi V Space II system is the refrigerant piping. The table below lists pipe length limits that must be
followed in the design of a Multi V Space II refrigerant pipe system:
Table 15: Multi V Space II Refrigerant Piping System Limitations.
Pipe Length
(ELF = Equivalent Length
of pipe in Feet)
Elevation
(All Elevation Limitations
are Measured in Actual
Feet)
Table 16: Equivalent Piping Length for Y-branches, Headers, and Other Piping Components.
Component
Elbow (ft.)
Y-branch (ft.)
1
Header (ft.)
refrIGerant PIPInG connectIons
Vapor Conn. (inches)
3/8
The leak prevention cap attached to the
outdoor unit must be removed before piping
installation.
Longest total equivalent piping length
Longest distance from outdoor unit (ODU) to indoor unit (IDU)
Distance between fittings and indoor units
Minimum distance between Indoor unit to any Y-branch
Minimum distance from indoor unit to Y-branch
Maximum distance between first Y-branch to farthest indoor unit
If outdoor unit is above indoor unit
If outdoor unit is below indoor unit
Between any two indoor units
1/4
3/8
1/2
0.5
0.6
0.7
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.
3/4
Figure 28: Space II Unit Pipe Connections.
Liquid Pipe
Size (Inches)
5/8
3/4
7/8
1
0.8
1.2
1.3
1.5
Figure 27: Space II Refrigerant Piping (and
Wiring) Direction.
Front Panel
DIRECTION OF PIPING/WIRING
Vapor Pipe
Service Ports
≤ 476 feet
230 feet (Actual) 296 feet (Equivalent)
≥ 20 inches
≤ 131 feet
3 feet
131 feet
98.4 feet
98.4 feet
49 feet
1-1/8 1-1/4 1-3/8 1-1/2 1-5/8 1-3/4 2-1/8
1.6
1.8
2.0
2.1
1.6
3.3
2.3
2.5
2.8
27
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