Amend_0001_McAllen_Specs_Appendix-B_part-5.pdf

Installation

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.

LATS MULTI V Piping Design Software Proper design and installation of the refrigerant piping system is a criti-cal element of the Multi V system. Multi IV Heat Pump unit requires two pipes (liquid line and vapor line) between system components. Multi IV Heat Recovery unit requires three pipes (liquid, low-pressure vapor, and high pressure vapor) between the outdoor unit and the heat recovery unit. A properly designed refrigerant piping system ensures that refriger-ant is delivered to the evaporator coil’s electronic expansion valve (EEV) in a pure liquid state free of gas bubbles. A proper design also ensures a sufficient refrigerant gas flow rate in the vapor line(s) that eliminates the possibility of refrigeration oil from collecting in the vapor line(s).

Refrigerant Piping Quality Assurance LG Air Conditioning Technical Solution (LATS) Multi V software makes designing the refrigerant system easy. LATS Multi V is a Microsoft Windows®-based application that assists the engineer in refrigeration distribution pipe system design, verifies the design complies with pipe design limitations, applies capacity correction factors, and calculates the system refrigerant charge. The piping system design can be entered manually into LATS from a one-line pipe diagram. To ensure that the refrigerant piping design meets LG’s quality standards, a LATS refrigerant piping design must be provided with every Multi V IV order. Following the installation, if any changes or variations to the design were necessary, a new “as-built” LATS piping design software report must be created and provided to LG prior to system commissioning.

Systems that are close to the standard application limits may be converted into a conditional application by field changes to pipe equivalent lengths. Always check the LATS report actual pipe layout versus pipe limits. The user may want to increase pipe lengths when design condi-tions are approaching the Standard Application Piping Rule limits to force the LATS program to engineer the system using the “Conditional Application Pipe Rules,” which will increase the diameter of the main and a few branch segments to minimize the possibility of required pipe changes due to field installation variations.

REFRIGERANT PIPING INSTALLATION

Computer-assisted Refrigerant Pipe Design

It is imperative to avoid creating excessive pressure drop. When liquid refrigerant is subjected to excessive pressure drop, liquid refrigerant will change state and “flash” to vapor. Vapor present in a stream of liquid refrigerant before reaching the electronic expansion valve (EEV) results in a loss of system control and causes damage to the valve. The pipe system must be designed in a manner that avoids the creation of unwanted vapor.

Any field changes, such as re-routing, shortening or lengthening a pipe segment, adding or eliminating elbows and/or fittings, re-sizing, adding, or eliminating indoor units, changing the mounting height, or moving the location of a device or fitting during installa-tion should be done with caution and ALWAYS VERIFIED in LATS MULTI V SOFTWARE BEFORE supplies are purchased or installed.

Doing so may lead to a more profitable installation, reduce the potential for rework, and will reduce the potential for multiple visits to the job site to complete the system commissioning.

Adjusting LATS Multi V Output for Altitude When a system is installed at elevations significantly above sea level, consider the impact air density has on the capacity of the indoor and air source units. LATS does not de-rate indoor unit capacity for high altitude applications. Be sure to apply locally accepted altitude correction factors to calculate actual indoor unit capacities at that altitude.

Creating a Balanced Piping System Unlike designing ductwork or chilled and hot water pipe systems where balancing dampers, ball valves, orifices, circuit setters, or other flow control devices can be installed to modify or balance the flow of cooling medium, these cannot be used in a VRF system. Therefore, variable refrigerant flow system designs must be “self balanced.” Balanced liquid refrigerant distribution is solely dependent on the designer choosing the correct pipe size for each segment. Pipe sizing considerations include pipe length, pipe segment pressure drop relative to other pipe seg-ments in the system, type and quantity of elbows, bends, fitting installation orientation, and end use device elevation differences.

Figure 7: Screenshot of LATS Pipe System Design Tool in Tree Mode.

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Due to our policy of continuous product innovation, some specifications may change without notification.

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Device Connection Limitations

• The minimum number of connected and operating indoor units to Multi IV systems is one, taking into consideration of the minimum combination ratio.

• The maximum number of indoor units on Multi IV outdoor heat pump and heat recovery systems is:

Table 32: Multi IV Refrigerant Piping System Limitations.

Table 33: Equivalent Piping Length for Y-branches, Headers, and Other Piping Components.

Component Size (Inches)

1/4 3/8 1/2 5/8 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 Long Radius Elbow (ft.) 0.5 0.6 0.7 0.8 1.2 1.3 1.5 1.6 1.8 2.0 2.1 2.3 2.5 2.8

Y-branch (ft.)1 1.6 Header (ft.) 3.3

Heat Recovery Unit (ft.) (For ARUB Heat Recovery Units only) 8.2

1Kit contains two Y-branches: one for liquid and one for vapor.

REFRIGERANT PIPING INSTALLATION

System Engineering

One of the most critical elements of a Multi IV system is the refrigerant piping. The table below lists pipe length limits that must be followed in the design of a Multi IV refrigerant pipe system:

ARUN072BTE4-DTE4 / ARUB072BTE4-DTE4 = 13

ARUN096BTE4-DTE4 / ARUB096BTE4-DTE4 = 16

ARUN121BTE4-DTE4 / ARUB121BTE4-DTE4 = 20

ARUN144BTE4-DTE4 / ARUB144BTE4-DTE4 = 24

ARUN168BTE4-DTE4 / ARUB168BTE4-DTE4 = 29

ARUN192BTE4-DTE4 / ARUB192BTE4-DTE4 = 32

ARUN216BTE4-DTE4 / ARUB216BTE4-DTE4 = 35

ARUN240BTE4-DTE4 / ARUB240BTE4-DTE4 = 39

ARUN264BTE4-DTE4 / ARUB264BTE4-DTE4 = 42

ARUN288BTE4-DTE4 / ARUB288BTE4-DTE4 = 45

ARUN312/313BTE4-DTE4 / ARUB312/313BTE4-DTE4 = 52

ARUN336/337BTE4-DTE4 / ARUB336/337BTE4-DTE4 = 55

ARUN360BTE4-DTE4 / ARUB360BTE4-DTE4 = 58

ARUN384BTE4-DTE4 / ARUB384BTE4-DTE4 = 61

ARUN408BTE4-DTE4 / ARUB408BTE4-DTE4 = 64

ARUN432BTE4-DTE4 / ARUB432BTE4-DTE4 = 64

ARUN456BTE4-DTE4 / ARUB456BTE4-DTE4 = 64

ARUN480BTE4-DTE4 / ARUB480BTE4-DTE4 = 64

ARUN504BTE4-DTE4 / ARUB504BTE4-DTE4 = 64

Pipe Length (ELF = Equivalent Length of pipe in Feet)

Longest total equivalent piping length 3,280 feet Longest distance from outdoor unit to indoor unit 656 feet (Actual) 738 feet (Equivalent) Distance between fittings and indoor units ≥20 inches Distance between fittings and Y-branches ≥20 inches Distance between two Y-branches ≥20 inches Distance between two series-piped heat recovery units (ARUB Series only) ≥20 inches Minimum distance between indoor unit to any Y-branch 3 feet from indoor unit to Y-branch Maximum distance between first Y-branch to farthest indoor unit 131 feet (295 feet for conditional applications)

Elevation (All Elevation Limitations are Measured in Actual

Feet)

If outdoor unit is above or below indoor unit 360 feet Between indoor units on heat pump systems (ARUN Series), or indoor units connected to separate parallel heat recovery units (ARUB Series)

131 feet

Between indoor units connected to single heat recovery unit or series heat recovery units (ARUB series only)

49 feet

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.

Table 34: ACR Rated Copper Tubing Material.

Nominal Pipe Outside

Diameter (in) Actual Outside Diameter (in)

Drawn Temper Annealed Temper Nominal Wall Thickness (in) Weight (lb/ft) Cubic ft per

Linear ft Nominal Wall Thickness (in) Weight (lb/ft) Cubic ft per

Linear ft 1/4 0.250 -- -- -- 0.030 0.081 .00020 3/8 0.375 0.030 0.126 .00054 0.032 0.134 .00053 1/2 0.500 0.035 0.198 .00101 0.032 0.182 .00103 5/8 0.625 0.040 0.285 .00162 0.035 0.251 .00168 3/4 0.750 0.042 0.362 .00242 0.042 0.362 .00242 7/8 0.875 0.045 0.455 .00336 0.045 0.455 .00336

1-1/8 1.125 0.050 0.655 .00573 0.050 0.655 .00573 1All dimensions provided are in accordance with ASTM B280 – Standard.

2Design pressure = 551 psig.

3ACR Tubing is available as hard drawn or annealed (soft) and are suitable for use with R410A refrigerant.

4The Copper Tube Handbook, 2010, Copper Development Association Inc., 260 Madison Avenue, New York, NY 10016.

OD (in) 1/4 3/8 1/2 5/8 3/4 7/8 1-1/8 1-3/8 Material Rigid or Soft ACR Rated for R410A Rigid or Solid ACR Rated for R410A

Min. Bend Radius (in) .563 .9375 1.5 2.25 3.0 3.0 3.5 4.0 Min. Wall

Thickness (in) .03 .03 .035 .040 .042 .045 .050 .050

Table 35: ACR Rated Piping Wall Thicknesses.

Type Seamless Phosphorous Deoxidized Class UNS C12200 DHP

Straight Lengths H58 Temper Coils O60 Temper

Table 36: ACR Copper Tubing Dimensions and Physical Characteristics1-4

• Commercially available piping often contains dust and other materials. Always blow it clean with a dry inert gas.

• Prevent dust, water or other contaminants from entering the piping during installation.

REFRIGERANT PIPING INSTALLATION

System Engineering

Selecting Field-Supplied Copper Tubing Type ACR copper is the only approved refrigerant pipe material for use with LG Multi V commercial air conditioning products. ACR rated tub-ing is the only type that ships with yellow caps. Approved tubing for use with Multi V products will be marked “R410 RATED” along the length of the tube.

• Drawn temper (rigid) ACR copper tubing is available in sizes 3/8 through 2-1/8 inches (ASTM B 280, clean, dry and capped).

• Annealed temper (soft) ACR copper tubing is available in sizes 1/4 through 2-1/8 inches (ASTM B 280, clean, dry, and capped).

Tube wall thickness should meet local code requirements and be approved for a maximum operating pressure of 551 psi. When bending tub-ing, try to keep the number of bends to a minimum, and use the largest radii possible to reduce the equivalent length of installed pipe; also, bending radii greater than ten (10) pipe diameters can minimize pressure drop. Be sure no traps or sags are present when rolling out soft copper tubing coils.

LG recommends soft copper use to be limited to 1/2". Use hard drawn for larger sizes to avoid sags and kinks that lead to oil trapping.

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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.

LG Engineered Y-branch Kits and Header Kits LG Y-branch and Header kits are highly engineered devices designed to evenly divide the flow of refrigerant, and are used to join one pipe segment to two or more segments.

No Substitutions Only LG supplied Y-branch and Header fittings (as referenced below; sold separately) can be used to join one pipe segment to two or more segments. Third-party or field-fabricated Tee’s, Y-fittings, Headers, or other branch fittings are not qualified for use with LG Multi V IV systems.

The only field-provided fittings allowed in a Multi V IV piping system are 45° and 90° elbows.

Table 37: Y-Branches and Headers.

Y-branch Kit Model No Headers 4 branch 7 branch 10 branch

ARBLN01621 ARBLN07121 ARBLB01621 ARBLB07121 ARBL054 ARBL057 ARBL1010

ARBLN03321 ARBLN14521 ARBLB03321 ARBLB14521 ARBL104 ARBL107 ARBL2010

• If the diameter of the branch pipe segments differ from that of the designated refrigerant piping, trim the to the desired section using a pipe cutter, and then use an adapter to connect.

• Always follow manufacturer’s guidelines on refrigerant piping restrictions such as maximum length, elevation difference, and diameters. Fail-ure to do so can result in reduced heating / cooling performance or equipment malfunction.

REFRIGERANT PIPING INSTALLATION

System Engineering

LG Y-Branch Kits Consist of:

• Y-branches:

• For heat pump systems - one liquid line and one vapor line (two [2] total)

• For heat recovery systems - one liquid line, one low-pressure vapor line, and one high-pressure vapor line(three [3] total)

• Reducer fittings as applicable.

• Molded clam-shell type peel and stick insulation covers.

Indoor Unit Y-Branches Indoor unit Y-branches may be installed in horizontal or vertical configurations. When installed vertically, position the Y-branch so the straight-through leg is ±3° of plumb. When installed horizontally, position the Y-branch so the take-off leg is level and shares the same horizontal plane as the straight-through leg ±5° rotation.

Indoor unit Y-branches should always be installed with the single port facing the outdoor unit, the two-port end facing indoor units (or heat recovery unit for heat recovery systems only). The first indoor unit Y-branch kit must be located at least three (3) feet from the outdoor unit. Provide a minimum of 20 inches between a Y-branch and any other fittings or indoor unit piped in series.

There is no limitation on the number of indoor unit Y-branches that can be installed, but there is a limitation on the number of indoor units connected to a single outdoor unit.

It is recommended that when a Y-branch is located in a pipe chase or other concealed space, access doors should be provided for inspection access.

Figure 8: Indoor Unit Y-branch Vertical Installation Alignment Specification.

Vertical up configuration. Vertical down configuration.

Figure 9: Horizontal Configuration.

±5°

Horizontal Plane

±5°

Branch LegStraight-through Leg

Y-branch Inlet

Y-Branch Kits LG Y-branch and kits are highly engineered devices designed to evenly divide the flow of refrigerant, and are used to join one pipe segment to two or more segments. There are two types of Y-branches used in LG VRF systems: Y-branches that combine two or three outdoor units to make up one large-capacity outdoor unit (also known as multi-frame connectors), or Y-branches used with the indoor units in the refriger-ant piping system at each transition. Field-supplied “T” fittings or “Y” branches will not be accepted. Do not install Y-branches backwards;

refrigerant flow cannot make U-turns through Y-branches. The equivalent pipe length of each Y-branch (1.6′) must be added to each pipe segment entered into LATS piping design software. See page 45 and 47 or 92 and 100 for Y-branch kit specifications and capacities.

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.

REFRIGERANT PIPING INSTALLATION

System Engineering

To next branch

To indoor unit

Figure 10: Diagram of an Incorrect Out-door Unit Y-branch Installation.

Figure 11: Y-branch Insulation and Pipe Detail.

Header Kits LG Header kits are highly engineered devices designed to evenly divide the flow of refrigerant, and are used to join one pipe segment to two or more segments.

Header kits are intended for use where multiple indoor units are in the same vi-cinity and it would be better to “home-run” the run-out pipes back to a centralized location. If connecting multiple indoor units that are far apart, Y-branches may be more economical. See page 46 or 93 for Header kit specifications and capacities.

LG Header Kits Consist of:

• Two headers (one liquid line, one vapor line).

• Reducer fittings as applicable.

• Molded clam-shell type peel and stick insulation covers—one for the liquid line and one for the vapor line.

Y-branches can be installed upstream between the Header and the outdoor unit, but a Y-branch cannot be installed between a Header and an indoor unit. Head-ers must be installed in a horizontal and level position with the distribution ports of the fitting in the same horizontal plane as the straight-through branch.

When connecting indoor units to a Header, always connect the unit with the larg-est nominal capacity to the port closest to the outdoor unit. Then install the next largest indoor unit to the next port, working down to the smallest indoor unit. Do not skip ports.

All indoor units connected to a single Header fitting should be located with an elevation difference between indoor units that does not exceed 49 feet.

No Substitutions Only LG supplied Y-branch and Header fittings can be used to join one pipe segment to two or more segments. Third-party or field-fabricated Tee’s, Y-fittings, Headers, or other branch fittings are not qualified for use with LG Multi V IV systems. The only field-provided fittings allowed in a Multi V IV piping system are 45° and 90° elbows.

Install Correctly

• Y-branches can be installed upstream between the Header and the outdoor unit, but a Y-branch cannot be installed between a header and an indoor unit.

• To avoid the potential of uneven refrigerant distribution through a header fitting, minimize the difference in equivalent pipe length be-tween the header fitting and each connected indoor unit.

LG supplied insulation jacketLG supplied headerField supplied copper pipe

Field supplied insulation

Field supplied copper pipe

Figure 12: Header Kit—Horizontal Rotation Limit (Must be Installed Level with No Rotation).

Figure 13: Header Insulation and Pipe Detail.

Smaller IDUs

Connect IDUs

Largest IDU

Header Inlet

Header End View

+0.0

-0.0

Outdoor Unit Y-Branches Outdoor unit Y-branches can only be installed in a horizontal configuration. When installed horizontally, position the Y-branch so it is within ±5° from level.

Outdoor unit Y-branches must always be installed with the two-port ends connected to the piping directly coming from the outdoor units, and the single port connected to the indoor unit refrigerant piping system supporting the indoor units.

Outdoor unit Y-branches are usually installed close to the outdoor unit, leaving enough space for servicing and maintenance.

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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.

Obstacles When an obstacle, such as an I-beam or concrete T, is in the path of the planned refrigerant pipe run, it is best practice to route the pipe over the obstacle. If adequate space is not available to route the insulated pipe over the obstacle, then route the pipe under the obstacle. In either case, it is imperative the length of the horizontal section of pipe above or below the obstacle be a minimum of three

(3) times the longest vertical rise (or fall) at either end of the segment.

No Pipe Size Substitutions Use only the pipe size selected by the LATS Multi V pipe system design software. Using a different size is prohibited and may result in a system malfunction or failure.

Under normal operating conditions, the vapor pipe temperature of a Multi IV system can vary as much as 180°F. With this large variance in pipe temperature, the designer must consider pipe expansion and contraction to avoid pipe and fitting fatigue failures.

Refrigerant pipe along with the insulation jacket form a cohesive unit that expands and contracts together. During system operation, thermal heat transfer occurs between the pipe and the surrounding insulation.

If the pipe is mounted in free air space, no natural restriction to movement is present if mounting clamps are properly spaced and installed. When the refrigerant pipe is mounted underground in a utility duct stacked among other pipes, natural restriction to linear movement is present. In extreme cases, the restrictive force of surface friction between insulating jackets could become so great that natural expansion ceases and the pipe is “fixed” in place. In this situation, opposing force caused by change in refrigerant fluid/vapor temperature can lead to pipe/fitting stress failure.

The refrigerant pipe support system must be engineered to allow free expansion to occur. When a segment of pipe is mounted between two fixed points, provisions must be provided to allow pipe expansion to naturally occur. The most common method is the inclusion of expansion Loop or U-bends mounted in the horizontal plane. When expansion loops are placed in a vertical riser, the loop is to be formed in a horizontal fashion resulting in a torsional move-ment during expansion and contraction.. See Figure 16 on page

116. Each segment of pipe has a natural fixed point where no movement occurs. This fixed point is located at the center point of the segment assuming the entire pipe is insulated in a similar fashion. The natural fixed point of the pipe segment is typically where the expansion Loop or U-bend should be. Linear pipe expansion can be calculated using the following formula:

1. From Table 38, find the row corresponding with the actual length of the straight pipe segment.

2. Estimate the minimum and maximum temperature of the pipe.

Typical pipe temperature change range: High Pressure Vapor:

ambient temperature to 215°F; Low Pressure Vapor: ambient to 35°F; Liquid pipe: ambient, 80°F, 110°F. Choose the two most extreme. In the column showing the minimum pipe temperature, look up the anticipated expansion distance. Do the same for the maximum pipe temperature.

3. Calculate the difference in the two expansion distance values.

The result will be the anticipated change in pipe length .

General Example:

A Multi V system is installed and the design shows that there is a 130 feet straight segment of piping between a Y-branch and an indoor unit. The system operates 24 hours per day. In heating, this pipe transports hot gas vapor to the indoor units at 120°F. In cool-ing, the same pipe is a suction line returning refrigerant vapor to the outdoor unit at 40°F. Look up the copper piping expansion at each temperature using Table 38, and calculate the difference.

Vapor Line Transporting Hot Vapor: 130 ft. pipe at 120°F = 1.54 in.

Transporting Suction Vapor: 130 ft. pipe at 40°F = 0.52 in.

Anticipated Change in Length: 1.54 in. – 0.52 in. = 1.02 in.

Liquid Line The liquid temperature remains relatively the same temperature; only the direction of flow will reverse. Therefore, no significant change in length of the liquid line is anticipated.

When creating an expansion joint, the joint depth should be a minimum of two times the joint width. Although different types of expansion arrangements are available, the data for correctly sizing an expansion loop is provided in Table 39. Use soft copper with long radius bends on longer runs or long radius elbows for shorter pipe segments. Using the anticipated linear expansion (LE) distance calculated, look up the Expansion Loop or U-bend minimum design dimensions. If other types of expansion joints are chosen, design per ASTM B-88 Standards.

LE = C x L x (Tr – Ta) x 12

LE = Anticipated linear tubing expansion (in.)

C = Constant (For copper = 9.2 x 10-6 in./in.°F) L = Length of pipe (ft.)

TR = Refrigerant pipe temperature (°F) Ta = Ambient air temperature (°F) 12 = Inches to feet conversion (12 in./ft.)

Copper Expansion and Contraction

Figure 14: Installing Piping Above and Below an Obstacle.

Above an obstacle. Below an obstacle.

3X

REFRIGERANT PIPING INSTALLATION

System Engineering

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.

Pipe Length1

Fluid Temperature °F 35° 40° 45° 50° 55° 60° 65° 70° 75° 80° 85° 90° 95° 100° 105° 110° 115° 120° 125° 130°

10 0.04 0.04 0.05 0.06 0.06 0.07 0.08 0.08 0.09 0.09 0.10 0.10 0.11 0.11 0.11 0.12 0.13 0.14 0.15 0.15 20 0.08 0.08 0.10 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.21 0.22 0.22 0.23 0.26 0.28 0.29 0.30 30 0.12 0.12 0.15 0.18 0.20 0.21 0.23 0.24 0.26 0.27 0.29 0.30 0.32 0.33 0.32 0.35 0.39 0.42 0.44 0.45 40 0.16 0.16 0.20 0.24 0.26 0.28 0.30 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.43 0.46 0.52 0.56 0.58 0.60 50 0.20 0.20 0.25 0.30 0.33 0.35 0.38 0.40 0.43 0.45 0.48 0.50 0.53 0.55 0.54 0.58 0.65 0.70 0.73 0.75 60 0.24 0.24 0.30 0.36 0.39 0.42 0.45 0.48 0.51 0.54 0.57 0.60 0.63 0.66 0.65 0.69 0.78 0.84 0.87 0.90 70 0.28 0.28 0.35 0.42 0.46 0.49 0.53 0.56 0.60 0.63 0.67 0.70 0.74 0.77 0.76 0.81 0.91 0.98 1.02 1.05 80 0.32 0.32 0.40 0.48 0.52 0.56 0.60 0.64 0.68 0.72 0.76 0.80 0.84 0.88 0.86 0.92 1.04 1.12 1.16 1.20 90 0.36 0.36 0.45 0.54 0.59 0.63 0.68 0.72 0.77 0.81 0.86 0.90 0.95 0.99 0.97 1.04 1.17 1.26 1.31 1.35 100 0.40 0.40 0.50 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.08 1.15 1.30 1.40 1.45 1.50 120 0.48 0.48 0.60 0.72 0.78 0.84 0.90 0.96 1.02 1.08 1.14 1.20 1.26 1.32 1.30 1.38 1.56 1.68 1.74 1.80 140 0.56 0.56 0.70 0.84 0.91 0.98 1.05 1.12 1.19 1.26 1.33 1.40 1.47 1.54 1.51 1.61 1.82 1.96 2.03 2.10 160 0.64 0.64 0.80 0.96 1.04 1.12 1.20 1.28 1.36 1.44 1.52 1.60 1.68 1.76 1.73 1.84 2.08 2.24 2.32 2.40 180 0.72 0.72 0.90 1.08 1.17 1.26 1.35 1.44 1.53 1.62 1.71 1.80 1.89 1.98 1.94 2.07 2.34 2.52 2.61 2.70 200 0.80 0.80 1.00 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00 2.10 2.20 2.16 2.30 2.60 2.80 2.90 3.00 220 0.88 0.88 1.10 1.32 1.43 1.54 1.65 1.76 1.87 1.98 2.09 2.20 2.31 2.42 2.38 2.53 2.86 3.08 3.19 3.30 240 0.96 0.96 1.20 1.44 1.56 1.68 1.80 1.92 2.04 2.16 2.28 2.40 2.52 2.64 2.59 2.76 3.12 3.36 3.48 3.60 260 1.04 1.04 1.30 1.56 1.69 1.82 1.95 2.08 2.21 2.34 2.47 2.60 2.73 2.86 2.81 2.99 3.38 3.64 3.77 3.90 280 1.12 1.12 1.40 1.68 1.82 1.96 2.10 2.24 2.38 2.52 2.66 2.80 2.94 3.08 3.02 3.22 3.64 3.92 4.06 4.20 300 1.20 1.20 1.50 1.80 1.95 2.10 2.25 2.40 2.55 2.70 2.85 3.00 3.15 3.30 3.24 3.45 3.90 4.20 4.35 4.50 320 1.28 1.28 1.60 1.92 2.08 2.24 2.40 2.56 2.72 2.88 3.04 3.20 3.36 3.52 3.46 3.68 4.16 4.48 4.64 4.80 340 1.36 1.36 1.70 2.04 2.21 2.38 2.55 2.72 2.89 3.06 3.23 3.40 3.57 3.74 3.67 3.91 4.42 4.76 4.93 5.10 360 1.44 1.44 1.80 2.16 2.34 2.52 2.70 2.88 3.06 3.24 3.42 3.60 3.78 3.96 3.89 4.14 4.68 5.04 5.22 5.40 380 1.52 1.52 1.90 2.28 2.47 2.66 2.85 3.04 3.23 3.42 3.61 3.80 3.99 4.18 4.10 4.37 4.94 5.32 5.51 5.70 400 1.60 1.60 2.00 2.40 2.60 2.80 3.00 3.20 3.40 3.60 3.80 4.00 4.20 4.40 4.32 4.60 5.20 5.60 5.80 6.00 420 1.68 1.68 2.10 2.52 2.73 2.94 3.15 3.36 3.57 3.78 3.99 4.20 4.41 4.62 4.54 4.83 5.46 5.88 6.09 6.30 440 1.76 1.76 2.20 2.64 2.86 3.08 3.30 3.52 3.74 3.96 4.18 4.40 4.62 4.84 4.75 5.06 5.72 6.16 6.38 6.60 460 1.84 1.84 2.30 2.76 2.99 3.22 3.45 3.68 3.91 4.14 4.37 4.60 4.83 5.06 4.97 5.29 5.98 6.44 6.67 6.90 480 1.92 1.92 2.40 2.88 3.12 3.36 3.60 3.84 4.08 4.32 4.56 4.80 5.04 5.28 5.18 5.52 6.24 6.72 6.96 7.20 500 2.00 2.00 2.50 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.40 5.75 6.50 7.00 7.25 7.50

1Pipe length baseline temperature = 0°F. "Expansion of Carbon, Copper and Stainless Steel Pipe," The Engineers' Toolbox, www.engineeringtoolbox.com.

Table 38: Linear Thermal Expansion of Copper Tubing in Inches.

REFRIGERANT PIPING INSTALLATION

System Engineering

See table below for precalculated anticipated expansion for various pipe sizes and lengths of refrigerant tubing.

To find the anticipated expansion value:

1. From the table below, find the row corresponding with the actual feet of the straight pipe segment.

2. Estimate the minimum and maximum temperature of the pipe.

3. In the column showing the minimum pipe temperature, look up the anticipated expansion distance corresponding to the segment length.

Do the same for the maximum pipe temperature.

4. Calculate the difference in the two expansion distance values. The result will be the change in pipe length.

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Figure 15: Coiled Expansion Loops and Offsets (Plan View Shown).

Anticipated Linear Expansion (LE) (in.)

Nominal Tube Size (OD) inches 1/4 3/8 1/2 3/4 1 1-1/4 1-1/2

1/2 R1 6 7 8 9 11 12 13 L2 38 44 50 59 67 74 80

1 R1 9 10 11 13 15 17 18 L2 54 63 70 83 94 104 113

1-1/2 R1 11 12 14 16 18 20 22 L2 66 77 86 101 115 127 138

2 R1 12 14 16 19 21 23 25 L2 77 89 99 117 133 147 160

2-1/2 R1 14 16 18 21 24 26 29 L2 86 99 111 131 149 165 179

3 R1 15 17 19 23 26 29 31 L2 94 109 122 143 163 180 196

3-1/2 R1 16 19 21 25 28 31 34 L2 102 117 131 155 176 195 212

4 R1 17 20 22 26 30 33 36 L2 109 126 140 166 188 208 226

1R = Centerline Length of Pipe.

2L = Centerline Minimum Radius (inches).

Table 39: Radii of Coiled Expansion Loops and Developed Lengths of Expansion Offsets.

R

L

LR

L

Large Tubing U-bend (>3/4 in.) Loop Small Tubing U-bend (<3/4 in.)

REFRIGERANT PIPING INSTALLATION

System Engineering

All expansions joints need to be on the horizontal plane. No vertical loops permitted.

All expansion loops and offsets should be installed in the horizontal plane to prevent the possibility of trapping oil. Loops and offsets in vertical risers should also be installed in a horizontal plane.

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.

Pipe Bends When bending soft copper, use long radius bends. Refer to the "Radii of Coiled Expansion Loops and Developed Lengths of Expansion Offsets” table for minimum radius specifications, page 116.

In-line Refrigeration Components Components such as oil traps, solenoid valves, filter-dryers, sight glasses, tee fittings, and other after-market accessories are not permitted on the refrigerant piping system between the outdoor units and the indoor units. Multi V IV systems are provided with redundant systems that assure oil is properly returned to the compressor. Sight-glasses and solenoid valves may cause vapor to form in the liquid stream. Over time, dryers may deteriorate and introduce debris into the system. The designer and installer should verify the refrigerant piping system is free of traps, sagging pipes, sight glasses, filter dryers, etc.

Field-provided Isolation Ball Valves LG allows the installation of field-supplied ball valves with Schrader ports at each indoor unit. Full-port isolation ball valves with Schrader ports (positioned between valve and indoor unit) rated for use with R410A refrigerant should be used on both the liquid and vapor lines.

If valves are not installed and a single indoor unit needs to be removed or repaired, the entire system must be shut down and evacuated. If isolation ball valves are installed, and an indoor unit needs to be repaired, the unaffected indoor units can remain operational. Reclamation of refrigerant, then, can be restricted to a single indoor unit.

Position valves with a minimum distance of three (3) to six (6) inches of pipe on either side of the valve, and placed between six (6) and twelve (12) inches from the Y-branch or header connecting the run-out pipe to the upstream main or branch pipe. If ball valves are installed closer to the indoor unit, a section of pipe becomes a dead zone when the valves are closed where oil may accumulate.

Valves shall be accessible for service. If necessary, install drywall access doors or removable ceiling panels, and position the valves to face the access door or ceiling panel opening. Mount valves with adequate space between them to allow for placement of adequate pipe insulation around the valves. Recommended best practice is to clearly label and document locations of all service valves, Y-branches, and headers.

Using Elbows Field supplied elbows are allowed if they are long radius and designed for use with R410A refrigerant. The designer and installer, however, should be cautious with the quantity and size of fittings used, and must account for the additional pressure losses in equivalent pipe length calculation for each branch. The equivalent pipe length of each elbow must be added to each pipe segment in the LATS program. See page 110 for equivalent lengths.

Installation of Refrigerant Piping / Brazing Practices

It is imperative to keep the piping system free of contaminants and debris such as copper burrs, slag, or carbon dust during installation.

1. All joints are brazed in the field. Multi V IV refrigeration system components contain very small capillary tubes, small orifices, electronic expansion valves, oil separators, and heat exchangers that can easily become blocked. Proper system operation depends on the installer using best practices and utmost care while assembling the piping system.

• Store pipe stock in a dry place; keep stored pipe capped and clean.

• Blow clean all pipe sections with dry nitrogen prior to assembly.

2. Proper system operation depends on the installer using best practices and the utmost care while assembling the piping system.

• Use adapters to assemble different sizes of pipe.

• Always use a non-oxidizing material for brazing. Do not use flux, soft solder, or anti-oxidant agents. If the proper material is not used, oxidized film may accumulate and clog or damage the compressors. Flux can harm the copper piping or refrigerant oil.

• Use a tubing cutter, do not use a saw to cut pipe. De-bur and clean all cuts before assembly.

3. Brazing joints:

• Use a dry nitrogen purge operating at a minimum pressure of three (3) psig and maintain a steady flow.

• Use a 15% silver phosphorous copper brazing alloy to avoid overheating and produce good flow.

• Protect isolation valves, electronic expansion valves, and other heat-sensitive control components from excessive heat with a wet rag or heat barrier spray.

System Engineering

REFRIGERANT PIPING INSTALLATION

Figure 16: Refrigerant Pipe Brazing.

Pressure-reducing Valve

ValveTaping

Nitrogen

Pipe to be brazed

Refrigerant Piping

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Pipe Supports A properly installed pipe system should be adequately supported to avoid pipe sagging.

Sagging pipes become oil traps that lead to equipment malfunction.

Pipe supports should never touch the pipe wall; supports shall be installed outside (around) the primary pipe insulation jacket. Insulate the pipe first because pipe supports shall be installed outside (around) the primary pipe insulation jacket. Clevis hangers should be used with shields between the hangers and insulation. Field provided pipe supports should be designed to meet local codes. If allowed by code, use fiber straps or split-ring hangers suspended from the ceiling on all-thread rods (fiber straps or split ring hangers can be used as long as they do not compress the pipe insulation). Place a second layer of insulation over the pipe insulation jacket to prevent chafing and compression of the primary insulation in the confines of the support clamp.

A properly installed pipe system will have sufficient supports to avoid pipes from sagging during the life of the system. As necessary, place supports closer for segments where potential sagging could occur. Maximum spacing of pipe supports shall meet local codes.

If local codes do not specify pipe support spacing, pipe shall be supported:

• Maximum of five (5) feet on center for straight segments of pipe up to 3/4 inches outside diameter size.

• Maximum of six (6) feet on center for pipe up to one (1) inch outside diameter size.

• Maximum of eight (8) feet on center for pipe up to two (2) inches outside diameter size.

Wherever the pipe changes direction, place a hanger within twelve (12) inches on one side and within twelve (12) to nineteen (19) inches of the bend on the other side. Support piping at indoor units, Y-branch and Header fittings.

Pipe Sleeves and Wall Penetrations LG requires that all pipe penetrations through walls, floors, and pipes buried underground be properly insulated and routed through an appropriate wall sleeve of sufficient size to prevent compression of refrigerant pipe insulation and free movement of the pipe within the sleeve. Underground refrigerant pipe shall be routed inside a protective sleeve to prevent insulation deterioration.

Figure 17: Pipe Hanger Details.

Figure 18: Typical Pipe Support Location— Change in Pipe Direction.

Figure 19: Pipe Support at Indoor Unit. Figure 20: Pipe Support at Y-branch Fitting. Figure 21: Pipe Support at Y-branch Fitting.

Max. 12"

~ 12" – 19"

A

B

A + B ~ 12" – 19"

Max. 12" Max. 12"

Max. 12"

Max. 12"

Max. 12"

Sealant Pipe Insulation

Wall Sleeve

Pipe Slope The horizontal pipe slope cannot exceed 10° up or down.

REFRIGERANT PIPING INSTALLATION

System Engineering

Figure 22: Typical Pipe Penetration.

Use a 4" + long sheet curved sheet metal saddles between hanger bracket and insula-tion to promote linear expansion/contraction.

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.

Dual-Frame Heat Pump Outdoor Unit Connections

Pipe Sizing for Heat Pump Units

REFRIGERANT PIPING INSTALLATION

Size (tons) Model Master Slave

16 ARUN192BTE4 ARUN121BTE4 ARUN072BTE4

ARUN192DTE4 ARUN121DTE4 ARUN072DTE4

18 ARUN216BTE4 ARUN144BTE4 ARUN072BTE4

ARUN216DTE4 ARUN144DTE4 ARUN072DTE4

20 ARUN240BTE4 ARUN144BTE4 ARUN096BTE4

ARUN240DTE4 ARUN144DTE4 ARUN096DTE4

22 ARUN264BTE4 ARUN144BTE4 ARUN121BTE4

ARUN264DTE4 ARUN144DTE4 ARUN121DTE4

24 ARUN288BTE4 ARUN144BTE4 ARUN144BTE4

ARUN288DTE4 ARUN144DTE4 ARUN144DTE4

A and B diameters match outdoor unit connection diameters. Main pipe D diameters are sized by LATS.

Figure 23: Heat Pump Dual Frame Connections.

Table 40: Heat Pump Dual-Frame Connection Pipe Sizes.

ARCNN21

Outdoor Unit Connector Pipe Accessory

To Indoor Units

Slave Master

A

ARCNN21

(Multi-frame Outdoor Unit

Y-branch Connector)

B D (main pipe sized by LATS)

• Largest-capacity outdoor units must be the master in a multi-frame system and placed in the position closest to pipe segment "D" in the figure above.

• Single-compressor outdoor units (72,000 Btu/h capacity) cannot be the master outdoor units in a multi-frame system.

• Master outdoor unit capacity must be greater than or equal to the slave1 outdoor unit capacity, and, where applicable, slave1 outdoor unit capacity must be greater than or equal to the slave2 outdoor unit capacity.

• Insulate all refrigerant system piping and piping connections separately as detailed on page 145-146.

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Due to our policy of continuous product innovation, some specifications may change without notification.

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Triple-Frame Heat Pump Outdoor Unit Connections

Pipe Sizing for Heat Pump Units

REFRIGERANT PIPING INSTALLATION

Table 41: Heat Pump Triple-Frame Connection Pipe Sizes.

Figure 24: Heat Pump Triple-Frame Connections.

A1, A2, and A3 diameters match the outdoor unit connection diameters. Main pipe D diameters are sized by LATS. See the table below for B diameters.

ARCNN21 and ARCNN31 Outdoor Unit Connector Pipe Accessories

To Indoor Units

Slave2

Master

Slave1

A1 A2

ARCNN21

(Multi-frame Outdoor Unit

Y-branch Connector)

B A3 D (main pipe sized by LATS)

ARCNN31

(Multi-frame Outdoor Unit

Y-branch Connector)

Size (tons) Model Master Slave1 Slave2 B Liquid Vapor

26 ARUN312BTE4 ARUN144BTE4 ARUN096BTE4 ARUN072BTE4

5/8" 1-1/8"

ARUN312DTE4 ARUN144DTE4 ARUN096DTE4 ARUN072DTE4

28 ARUN336BTE4 ARUN144BTE4 ARUN096DTE4 ARUN096BTE4

ARUN336DTE4 ARUN144DTE4 ARUN096DTE4 ARUN096DTE4

30 ARUN360BTE4 ARUN144BTE4 ARUN121BTE4 ARUN096BTE4

ARUN360DTE4 ARUN144DTE4 ARUN121DTE4 ARUN096DTE4

32 ARUN384BTE4 ARUN145BTE4 ARUN145BTE4 ARUN096BTE4

1-3/8"

ARUN384DTE4 ARUN145DTE4 ARUN145DTE4 ARUN096DTE4

34 ARUN408BTE4 ARUN145BTE4 ARUN145BTE4 ARUN121BTE4

3/4"

ARUN408DTE4 ARUN145DTE4 ARUN145DTE4 ARUN121DTE4

36 ARUN432BTE4 ARUN145BTE4 ARUN145BTE4 ARUN145BTE4

ARUN432DTE4 ARUN145DTE4 ARUN145DTE4 ARUN145DTE4

38 ARUN456BTE4 ARUN169BTE4 ARUN145BTE4 ARUN145BTE4

ARUN456DTE4 ARUN169DTE4 ARUN145DTE4 ARUN145DTE4

40 ARUN480BTE4 ARUN169BTE4 ARUN169BTE4 ARUN145BTE4

ARUN480DTE4 ARUN169DTE4 ARUN169DTE4 ARUN145DTE4

42 ARUN504BTE4 ARUN169BTE4 ARUN169BTE4 ARUN169BTE4

ARUN504DTE4 ARUN169DTE4 ARUN169DTE4 ARUN169DTE4

• Largest-capacity outdoor units must be the master in a multi-frame system and placed in the position closest to pipe segment "D" in the figure above.

• Single-compressor outdoor units (72,000 Btu/h capacity) cannot be the master outdoor units in a multi-frame system.

• Master outdoor unit capacity must be greater than or equal to the slave1 outdoor unit capacity, and, where applicable, slave1 outdoor

• Insulate all refrigerant system piping and piping connections separately as detailed on page 145-146.

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.

Pipe Sizing for Heat Pump Systems

REFRIGERANT PIPING INSTALLATION

The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations.

Y-branch Pipe Sizing for a Single Outdoor Unit System Example: Five (5) indoor units connected ODU: Outdoor Units.

IDU: Indoor Units.

A: Main Pipe from Outdoor Unit to Y-branch.

B: Y-branch to Y-branch.

C: Y-branch to Indoor Unit.

Y-branch Pipe Sizing When Installing a Dual-Frame System Example: Five (5) indoor units connected ODU: Outdoor Units.

IDU: Indoor Units.

A: Main Pipe from Outdoor Unit to Y-branch.

B: Y-branch to Y-branch.

C: Y-branch to Indoor Unit.

• Larger-capacity outdoor units must be the master in a multi-frame system.

• Single-compressor outdoor units (72,000 Btu/h capacity) cannot be the master outdoor unit in a multi-frame system.

• Master outdoor unit capacity must be greater than or equal to the slave outdoor unit capacity.

See pages 123-124 for refrigerant pipe diameter and pipe length tables.

Length: ≤492 feet (656 feet conditional application)

El ev ati on

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≤3 fe et ℓ: ≤131 feet (295 feet conditional application)

Elevation2: ≤131 feet

To indoor units To outdoor unit

B B B

A

C C C

C

C

ODU

Y-branch

Y-branch

IDU IDU IDU IDU

IDU

Master ODU

Slave ODU

To indoor units

≤33 feet

El ev ati on

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≤3 fe et

Elevation2: ≤131 feet

To outdoor unit

C C C

CBBB

Length: ≤492 feet (656 feet conditional application) ℓ: ≤131 feet (295 feet conditional application) he igh t1 ≤1

6- 7/1

6 f ee t

Y-branch

A

Y-branch C

IDU

IDU IDU IDU

IDU

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Pipe Sizing for Heat Pump Systems

REFRIGERANT PIPING INSTALLATION

The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations.

Y-branch Pipe Sizing When Installing a Triple-Frame System Example: Five (5) indoor units connected ODU: Outdoor Units.

IDU: Indoor Units.

A: Main Pipe from Outdoor Unit to Y-branch.

B: Y-branch to Y-branch.

C: Y-branch to Indoor Unit.

Header Pipe Sizing When Installing a Single Outdoor Unit System Example: Six (6) indoor units connected ODU: Outdoor Units IDU: Indoor Units A: Main Pipe from Outdoor Unit to Header C: Header to Indoor Unit

• Larger-capacity outdoor units must be the master in a multi-frame system.

• Single-compressor outdoor units (72,000 Btu/h capacity) cannot be the master outdoor unit in a multi-frame system.

• Master outdoor unit capacity must be greater than or equal to the slave1 outdoor unit capac-ity, and, where applicable, slave1 outdoor unit capacity must be greater than or equal to the slave2 outdoor unit capacity.

he igh t1 ≤1

6- 7/1

6 f ee t

≤33 feet

Slave1 ODU Slave2 ODU

Master ODU

Y-branch To indoor units

To outdoor units

A

C C C C

CB B B

El ev ati on

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≤3 fe et

Elevation2: ≤131 feet

Length: ≤492 feet (656 feet conditional application) ℓ: ≤131 feet (295 feet conditional application)

IDU

IDUIDUIDU

Y-branch

IDU

El ev ati on

1:

≤3 fe et

A

C C C C C C ℓ: ≤131 feet (295 feet conditional application)

Length: ≤492 feet (656 feet conditional application)

Elevation2: ≤131 feet

ODU

Brazed Cap

Header

IDU IDU

IDU IDU IDU

IDU

See pages 123-124 for refrigerant pipe diameter and pipe length tables.

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.

Combination Y-branch Pipe and Header Pipe Sizing When Installing a Dual- Frame System Example: Five (5) indoor units connected ODU: Outdoor Units.

IDU: Indoor Units.

A: Main Pipe from Outdoor Unit to First Y-branch.

B: Y-branch to Y-branch / Header.

C: Y-branch / Header to Indoor Unit.

See pages 123-124 for refrigerant pipe diameter and pipe length tables.

• Larger-capacity outdoor units must be the master in a multi-frame system.

• Single-compressor outdoor units (72,000 Btu/h capacity) cannot be the master outdoor unit in a multi-frame system.

• Master outdoor unit capacity must be greater than or equal to the slave outdoor unit capacity.

• Y-branches and other header branches cannot be installed downstream of the initial header branch.

ODU

Capacity

(ton)

Pipe diameter when pipe length is <295 feet

(Standard)

Pipe diameter when pipe length is ≥295 feet

(ODU ↔ IDU)

Pipe diameter when height differential (ODU

↔ IDU) is >164 feet

Liquid pipe (inches OD)

Vapor pipe (inches OD)

Liquid pipe (inches OD)

Vapor pipe (inches OD)

Liquid pipe (inches OD

Vapor pipe (inches OD)

6 3/8Ø 3/4Ø 1/2Ø 7/8Ø 1/2Ø No Increase 8 3/8Ø 7/8Ø 1/2Ø 1-1/8Ø 1/2Ø No Increase

10-12 1/2Ø 1-1/8Ø 5/8Ø No Increase 5/8Ø No Increase 12-14* 5/8Ø 1-1/8Ø 3/4Ø 1-1/4Ø 3/4Ø No Increase 14-18 5/8Ø 1-1/8Ø 3/4Ø 1-1/4Ø 3/4Ø No Increase

20 5/8Ø 1-3/8Ø 3/4Ø No Increase 3/4Ø No Increase 22-28 3/4Ø 1-3/8Ø 7/8Ø 1-1/2Ø 7/8Ø No Increase 30-36 3/4Ø 1-5/8Ø 7/8Ø No Increase 7/8Ø No Increase 1For the first branch pipe, use the branch pipe that matches main pipe A diameter.

Downstream Total Capacity of

IDUs (Btu/h)1

Liquid pipe (inches

OD)

Vapor pipe (inches

OD)

≤19,100 1/4Ø 1/2Ø ≤54,600 3/8Ø 5/8Ø ≤76,400 3/8Ø 3/4Ø ≤114,700 3/8Ø 7/8Ø ≤172,000 1/2Ø 1-1/8Ø ≤229,400 5/8Ø 1-1/8Ø ≤248,500 5/8Ø 1-3/8Ø ≤344,000 3/4Ø 1-3/8Ø ≤592,500 3/4Ø 1-5/8Ø

Table 42: Main Pipe (A) Diameter from Outdoor Unit to First Y-branch / Header Branch. Table 43: Refrigerant Pipe Diameter (B) from Y-branch to Y-branch / Header.

Indoor Unit Capacity1 Liquid pipe (inches OD) Vapor pipe (inches OD) ≤19,100 1/4Ø 1/2Ø ≤54,600 3/8Ø 5/8Ø ≤76,400 3/8Ø 3/4Ø

Table 44: Indoor Unit Connecting Pipe from Branch (C).

19,600-24,200 Btu/h 4-way 3 feet x 3 feet Cassette and 15,400-24,200 Btu/h High Static Ducted indoor units have 3/8Ø (liquid) and 5/8Ø (vapor).

If the next higher pipe diameter size is not available, then sizing up is not possible.

Master ODU

Slave ODU

El ev ati on

2:

≤1 fe et

B

C

B

C C C

≤33 feet

A

Length: ≤492 feet (656 feet conditional application) ℓ: ≤131 feet (295 feet conditional application)

El ev ati on

1:

≤3 fe et

IDU

IDU

Header

IDU IDU IDU

Brazed Cap

C he igh t1 ≤1

6- 7/1

6 f ee t

Y-branch (first)

Y-branch (second)

To indoor unitsTo outdoor unit

Y-branch

Pipe Sizing for Heat Pump Systems

REFRIGERANT PIPING INSTALLATION

The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations.

*ARUN145BTE4 / ARUN145DTE4 and ARUN169BTE4 / ARUN169DTE4 only.

UL

TI

V

IV

S ys te m In st al la tio n M an ua l

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.

Length Total pipe length Longest actual pipe length Equivalent pipe length1

A + ΣB + ΣC ≤ 3,280 feet ≤492 feet (656 feet conditional application) ≤574 feet (738 feet conditional application) ℓ Longest pipe length after first branch ≤131 feet (295 feet conditional application)

Elevation1 Elevation differential (Outdoor Unit ↔ Indoor Unit) Height ≤360 feet

Elevation2 Elevation differential (Indoor Unit ↔ Indoor Unit) height ≤131 feet height1 Elevation differential (Outdoor Unit ↔ Outdoor Unit)

16.4 feet

Distance between ODU to ODU ≤33 feet (Max. 43 feet for ODU ≥12 tons) Distance between fittings and IDU ≥20 inches

Distance between fittings and Y-branches / Headers ≥20 inches Distance between two Y-branches / Headers ≥20 inches

If the pipe (B) diameters after the first branch are bigger than the main pipe (A) diameters, pipe (B) should changed to match main pipe (A) sizes.

Example: When an indoor unit combination ratio of 120% is connected to a 22-ton outdoor unit:

Outdoor unit main pipe (A) diameters: 1-3/8Ø inches (vapor) and 5/8Ø inches (liquid).

1. Pipe (B) diameters: 1-3/8Ø (vapor) and 3/4Ø (liquid) (after the first branch, when indoor unit combination ratio is 120% [26 tons]).

2. After the first branch, pipe (B) diameters must be changed to 1-3/8Ø inches (vapor) and 5/8Ø inches (liquid) to match main pipe (A) sizes.

Table 45: Pipe Capabilities.

Instead of using the total indoor unit capacity to choose main pipe (A) diameters, use outdoor unit capacity to choose downstream main pipe

(A) diameters. Do not permit connection pipes (B) from branch to branch to exceed main pipe (A) diameters as indicated by outdoor unit capacity. Example: When an indoor unit combination ratio of 120% is connected to a 20-ton outdoor unit (24 tons), and indoor unit with a 7,000 Btu/h capacity is located at the first branch:

1. Main pipe…