Piping Limitations And Placement Considerations - LG Multi V Water V ARWM072CAS5 Engineering Manual

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
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.
Figure 25: Typical Heat Pump System Building Layout with Piping Limitations.
E lev ation
Differential
WS U to
E lev ation
IDU: 164'
Differential
IDU to IDU: 131'
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'
Table 30: Piping Limitations for Heat Pump Operation.
Total pipe length
Length
A + ΣB + ΣC ≤ 1,640 feet
ℓ
≤131 feet (295 feet conditional application)
Elevation differential (Water Source Unit ↔ Indoor Unit)
Elevation1
Elevation differential (Indoor Unit ↔ Indoor Unit)
Elevation2
Elevation differential ((Highest Water Source Unit ↔ Lowest Water Source Unit)
height1
Distance between Water Source Unit to Water Source Unit
Distance between fittings and Indoor Unit
Distance between fittings and Y-branches / Headers
Distance between two Y-branches / Headers
Assume equivalent pipe length of Y-branch is 1.6 feet, and equivalent pipe length of header is 3.3 feet.
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PIPING LIMITATIONS
Longest actual pipe length Equivalent pipe length
≤656 feet ≤738 feet
Longest pipe length after first branch
Height ≤164 feet
Height ≤131 feet
Height ≤16 feet
≤33 feet
≥20 inches
≥20 inches
≥20 inches
LIMITS / PLACEMENT | 59
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