LIMITS / PLACEMENT | 59
Piping Limitations and Placement Considerations
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PIPING
LIMITATIONS AND
PLACEMENT
CONSIDERATIONS
Piping Limitations for systems designed for Heat
Pump operation on page 59
Piping Limitations for systems designed for Heat
Recovery operation on page 63
Refrigerant Piping for Separated Water Source Units
on page 69
Placement Considerations on page 71
Transporting/Lifting on page 72
Installation Considerations on page 73
E lev ation
Differential
WS U to
IDU: 164'
L ongest pipe length after first
branch: 131' ( 295' conditional)
L ongest pipe length: 656' actual ( 738' eq uiv )
M ax imum Total Piping L ength: 1, 640'
E lev ation
Differential
IDU to IDU: 131'
Figure 25: Typical Heat Pump System Building Layout with Piping Limitations.
PIPING LIMITATIONS
For Systems Designed for Heat Pump Configuration
Following pages present Multi V Water V piping limitations and are for illustrative purposes only. Designers MUST use LATS when designing LG VRF
systems.
Length
Total pipe length
Longest actual pipe length
Equivalent pipe length
1
A + ΣB + ΣC ≤ 1,640 feet
≤656 feet
≤738 feet
ℓ
Longest pipe length after first branch
≤131 feet (295 feet conditional application)
Elevation1
Elevation differential (Water Source Unit ↔ Indoor Unit)
Height ≤164 feet
Elevation2
Elevation differential (Indoor Unit ↔ Indoor Unit)
Height ≤131 feet
height1
Elevation differential ((Highest Water Source Unit ↔ Lowest Water Source Unit)
Height ≤16 feet
Distance between Water Source Unit to Water Source Unit
≤33 feet
Distance between fittings and Indoor Unit
≥20 inches
Distance between fittings and Y-branches / Headers
≥20 inches
Distance between two Y-branches / Headers
≥20 inches
Table 30: Piping Limitations for Heat Pump Operation.
1
Assume equivalent pipe length of Y-branch is 1.6 feet, and equivalent pipe length of header is 3.3 feet.