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Design Guideline Summary - LG Multi IV Engineering Manual

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Figure 16: Typical VRF Heat Pump System Building Layout Listing the
Piping Limitations.
Max. Total Equivalent Piping Length: 3,280'
Table 32: Equivalent Piping Length for Y-branches, Headers, and Other Piping Components.
Component
Long Radius Elbow (ft.)
Y-branch (ft.)
1
Header (ft.)
Heat Recovery Unit (ft.)
(For ARUB Heat Recovery Units only)
Kit for ARUN Heat Pump systems contains two Y-branches: one for liquid and one for vapor; Kit for ARUB Heat Recovery systems contains three Y-
1
branches: one for liquid, one for low-pressure vapor, one for high-pressure vapor.
REFRIGERANT PIPING DESIGN
1/4
3/8
1/2
5/8
0.5
0.6
0.7
0.8
©
Piping Design Guideline Summary
Figure 17: Typical VRF Heat Recovery System Building Layout Listing
the Piping Limitations..
Max. Total Equivalent Piping Length: 3,280'
Size (Inches)
3/4
7/8
1
1-1/8 1-1/4 1-3/8 1-1/2 1-5/8 1-3/4 2-1/8
1.2
1.3
1.5
1.6
1.8
1.6
3.3
8.2
Elevation Differential Two IDUs
Connected to One HRU: 49'
2.0
2.1
2.3
2.5
2.8
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