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CUT SHEETS
Indoor Unit Y-branch Kits for Heat Recovery Systems
• LG indoor unit Y-branch fittings must be used with
LG systems and be properly installed following the
instructions in the applicable LG manual. Field-
supplied branch fittings are not permitted.
• Kit components must be kept free of debris and dry
before installation.
• All Y-branch Kits include a clam shell, peel-and-
stick insulation jacket.
Note:
• Design pressure is 550 psig.
• All dimensions in inches.
Length tolerance ±1/4 inch.
• Images are not to scale.
Models
ARBLB01621
ARBLB03321
ARBLB07121
ARBLB14521
40
Table 31: Nominal Capacity Range (Btu/h).
Table 32: Insulation Jacket Properties.
Low-Pressure Vapor Pipe
I.D. 1/2
I.D. 1/2
I.D. 5/8
I.D. 5/8
1
I.D. 5/8
2-15/16
I.D. 1/2
11-1/16
11-1/2
I.D. 3/4
1
O.D. 5/8
AJR54072905
2-3/4
I.D. 7/8
I.D. 3/4
I.D. 5/8
I.D. 1
I.D. 3/4
I.D. 1/2
2
1
I.D. 3/4
I.D. 5/8
I.D. 1/2
15-3/8
3
16-1/4
I.D. 7/8
I.D. 7/8
I.D. 1-1/8
O.D. 1
O.D. 3/4
O.D. 3/4
I.D. 1
3
1
2
3-3/16
4-3/8
2-3/4
AJR54072906
I.D. 3/4
I.D. 1-1/8
I.D. 7/8
I.D. 5/8
2
1
I.D. 5/8
I.D. 1-1/4
3-13/16
I.D. 3/4
I.D. 1/2
14-13/16
3
15-15/16
I.D. 1-1/8
I.D. 1-3/8
I.D. 7/8
O.D. 3/4
I.D. 1-1/4
O.D. 7/8
O.D. 1-1/4
I.D. 1-1/8
2
1
3
3-9/16
4-3/4
4-3/4
AJR54072907
I.D. 1-3/8
I.D. 1-3/8
I.D. 1-1/2
I.D. 1-5/8
I.D. 1-1/8
2
I.D. 1-1/8
I.D. 1-1/2
4-15/16
I.D. 1-3/8
I.D. 7/8
18-9/16
3
20-3/8
I.D. 3/4
I.D. 1-5/8
I.D. 5/8
O.D. 7/8
I.D. 1-1/2
O.D. 1-1/2
O.D. 1-3/8
3
2
3
3-9/16
4-3/4
5-1/8
I.D. 1/2
I.D. 7/8
O.D. 1-1/8
3
I.D. 3/4
2
O.D. 5/8
2-3/4
4-3/4
AJR54072908
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Model
Fitting Capacity
ARBLB01621
≤72,000 connected capacity
ARBLB03321
≤144,000 connected capacity
ARBLB07121
≤336,000 connected capacity
ARBLB14521
≤432,000 connected capacity
Material
Polyolefin Foam
UL94 Flame Classification
HF-1
Density
1.84 lbs./ft.
Thermal Conductivity
0.0208 Btu/h/ft. ºF
Thickness
1/2 inch
Liquid pipe
I.D. 3/8
I.D. 1/4
I.D. 3/8
1
I.D. 1/4
I.D. 3/8
11-1/16
11-1/2
I.D. 1/2
1
O.D. 3/8
AJR54072901
2-3/4
I.D. 1/2
I.D. 3/8
I.D. 1/4
I.D. 3/8
3-5/16
I.D. 1/2
I.D. 1/2
I.D. 3/8
I.D. 1/4
12-5/8
13-1/16
AJR54072902
I.D. 3/4
I.D. 5/8
I.D. 5/8
I.D. 1/2
I.D. 1/2
I.D. 1/2
I.D. 5/8
I.D. 3/4
I.D. 3/4
14-5/8
15-1/2
I.D. 3/8
I.D. 3/8
O.D. 1/2
I.D. 1/4
O.D. 1/2
3
2
2-3/4
4-3/8
AJR54072903
I.D. 5/8
I.D. 3/4
I.D. 7/8
I.D. 3/4
I.D. 5/8
1
I.D. 5/8
I.D. 7/8
I.D. 3/4
16-3/8
17-1/2
I.D. 1/2
O.D. 3/4
O.D. 5/8
O.D. 1/2
I.D. 3/8
I.D. 7/8
I.D.
2
3
3
1-5/8
3-3/16
4-3/8
4-3/8
AJR54072904
3
High-Pressure Vapor Pipe
I.D. 1/2
I.D. 1/4
I.D. 3/8
I.D. 1/2
2-15/16
I.D. 5/8
I.D. 1/2
13-13/16
14-11/16
AJR72963601
I.D. 3/4
I.D. 3/4
I.D. 7/8
I.D. 7/8
I.D. 3/4
I.D. 7/8
I.D. 1
2-15/16
16-9/16
17-1/2
O.D. 5/8
I.D. 1/2
O.D. 5/8
I.D. 1/2
I.D. 3/8
3
2
2-3/4
4-3/8
AJR72963602
I.D. 1
I.D. 1
I.D. 7/8
2
I.D. 1
3-5/16
I.D. 1-1/8
I.D. 7/8
3
15
16-1/8
O.D. 3/4
O.D. 1/2
O.D. 3/4
I.D. 3/8
I.D. 5/8
3
2
3
2-3/4
2-3/4
AJR72963603
I.D. 1-1/4
I.D. 1-3/8
I.D. 1-1/4
I.D. 1-1/8
2
1
I.D 1/2
I.D. 1-1/4
3-13/16
I.D. 1-1/8
I.D. 1-1/8
3
17-7/8
19-3/8
I.D. 3/8
O.D. 1
O.D. 1/2
I.D. 3/8
I.D. 7/8
I.D. 1/4
3
2
3-3/16
2-3/4
I.D. 3/4
O.D. 1
I.D. 7/8
O.D. 3/4
3
3
4-3/8
4-3/4
AJR72963604
Unit: Inch
I.D. 3/8
I.D. 5/8
I.D. 5/8
2-15/16
I.D. 3/8
I.D. 5/8
2
I.D.
3-13/16
5/8
3
I.D. 3/4
2
3-13/16
I.D. 3/4
3
I.D. 1/2
I.D. 5/8
4-3/8
I.D. 1
2
4-3/8
I.D. 1
3
I.D. 5/8
I.D. 1/2
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