Due To Our Policy Of Continuous Product Innovation, Some Specifications May Change Without Notification - LG ARUM072BTE5 Installation Manual

Table 39: Refrigerant Pipe (B) Diameters between Y-branches and Y-branches / Heat Recovery Unit / Headers.
Downstream IDU total capacity
(Btu/h)
≤19,100
<54,600
<76,400
<114,700
<172,000
<229,400
<248.500
<344,000
<592,500
Table 40: Indoor Unit Connecting Pipe from Branch (C).
Indoor Unit Capacity
≤19,100
≤54,600
≤76,400
≤95,900
9,600-24,200 Btu/h 4-way 3 feet x 3 feet Cassette and 15,400-24,200 Btu/h High Static Ducted IDUs have 3/8Ø (liquid) and 5/8Ø (vapor).
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Conditional Applications
Conditional applications are computed in LATS. See below for an explanation of when pipes are upsized.
If the equivalent length between the first Y-branch to the farthest indoor unit is >131 feet (maximum 295 feet):
• Pipe segment diameters between the first branch and the last branch must be sized up by one. This applies to both liquid and low / high
vapor pipes. If the next size up is not available, or if the pipe segment diameters are the same as main pipe (A) diameters, sizing up is not
possible.
• While calculating total refrigerant piping length, pipe (B) segment lengths between the first Y-branch and second Y-branch, and between the
second Y-branch and the heat recovery unit must be calculated by two.
• Length of pipe (C) from each indoor unit to the closest Y-branch, header, or heat recovery unit ≤49 feet.
• [Length of pipe from outdoor unit to farthest indoor unit (A+B+C)] - [Length of pipe from outdoor unit to closest indoor unit (A+B+C)] ≤131
feet.
INSTALLING FOR HEAT RECOVERY
Liquid pipe (inches OD)
1/4Ø
3/8Ø
3/8Ø
3/8Ø
1/2Ø
5/8Ø
5/8Ø
3/4Ø
3/4Ø
Liquid pipe (inches OD)
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Due to our policy of continuous product innovation, some specifications may change without notification.

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Vapor pipe (inches OD)
Low pressure
1/2Ø
5/8Ø
3/4Ø
7/8Ø
1-1/8Ø
1-1/8Ø
1-3/8Ø
1-3/8Ø
1-5/8Ø
1/4Ø
3/8Ø
3/8Ø
3/8Ø
OPERATION
Sample Layouts
High pressure
3/8Ø
1/2Ø
5/8Ø
3/4Ø
7/8Ø
7/8Ø
1-1/8Ø
1-1/8Ø
1-3/8Ø
Vapor pipe (inches OD)
1/2Ø
5/8Ø
3/4Ø
7/8Ø
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