LIMITS / PLACEMENT | 49
Piping Limitations and Placement Considerations
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THREE-PHASE
Figure 20: Typical Multi V S Three-Phase Heat Pump System Building
Layout Listing the Piping Limitations — When the Outdoor Unit is Above
the Indoor Units.
Figure 21: Typical Multi V S Three-Phase Heat Pump System Building
Layout Listing the Piping Limitations — When the Outdoor Unit is Below
the Indoor Units.
Elevation Differential ODU to IDU: 164'
Elevation Differential IDU to IDU: 49'
Longest pipe length after first branch: 131'
Longest pipe length: 492' actual (574' equiv.)
Max. Total Equivalent Piping Length: 984'
Elevation Differential ODU to IDU: 131'
Elevation Differential IDU to IDU: 49'
Longest pipe length after
first branch: 131'
Longest pipe length: 492' actual (574' equiv.)
Max. Total Equivalent Piping Length: 984'
Table 9: Piping Limitations for Multi V S Three-Phase Heat Pump Operation (See next page).
PIPING LIMITATIONS
The following pages present Multi V S Three-Phase piping limitations and are for illustrative purposes only. Designers MUST use LATS when designing LG VRF systems.
1
Assume equivalent pipe length of Y-branch is 1.6 feet, and equivalent pipe length of header is 3.3 feet.
Length
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Longest pipe length after first branch
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Elevation1
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When the Outdoor unit is Positioned Higher than the Indoor Units When the Outdoor unit is Positioned Lower than the Indoor Units
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Elevation2
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Distance between two Y-Branches / Headers
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