LG LSN180HSV4, LSN090HSV4, LMN248HVT Installation Manual

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STANDARD WALL-MOUNTED INDOOR UNIT

INSTALLATION MANUAL

• LMN077HVT 7 kBtu

• LSN090HSV4 9 kBtu

• LSN120HSV4 12 kBtu

• LMN157HVT 15 kBtu

• LSN180HSV4 18 kBtu

• LMN247HVT 24 kBtu

PROPRIETARY DATA NOTICE

This document, as well as all reports, illustrations, data, information, and other

materials are the property of LG Electronics U.S.A., Inc., and are

disclosed by LG Electronics U.S.A., Inc., only in confidence.

Do not throw away, destroy, or lose this manual.

Please read carefully and store in a safe place for future reference.

Content familiarity required for proper installation.

The instructions included in this manual must be followed to prevent prod-

uct malfunction, property damage, injury, or death to the user or other

people. Incorrect operation due to ignoring any instructions will cause

harm or damage. A summary of safety precautions begins on page 4.

For more technical materials such as submittals, engineering

databooks, and catalogs, visit www.lghvac.com.

IM-Multi-F_StdWallMount-03-15

For continual product development, LG Electronics U.S.A., Inc., reserves the right to change specifications without notice.

©LG Electronics U.S.A., Inc.

This document, as well as all reports, illustrations, data, information, and other materials are the property of LG Electronics U.S.A., Inc.

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TABLE OF CONTENTS

CONTENTS

Safety Instructions ........................................................................................................................................... 4

Introduction ...................................................................................................................................................... 9

Unit Nomenclature ......................................................................................................................................... 11

General Data ................................................................................................................................................. 12

Specications ............................................................................................................................................................. 13

Typical Multi F/Multi F Max Systems .......................................................................................................................... 15

Refrigerant Piping Requirements ............................................................................................................................... 17

General Installation Guidelines ...................................................................................................................... 18

Location Selection ...................................................................................................................................................... 18

Inspection ................................................................................................................................................................... 19

Refrigerant Piping ....................................................................................................................................................... 22

Piping Materials and Handling .................................................................................................................................... 30

Piping Preparation ...................................................................................................................................................... 31

Installation Manual

Piping Connections ........................................................................................................................................ 32

IDU to ODU ................................................................................................................................................................ 32

Piping Insulation ......................................................................................................................................................... 35

Drain Piping ................................................................................................................................................................ 37

Electrical Wiring ............................................................................................................................................. 38

Power Wiring Specications and Best Practices ........................................................................................................ 39

Power Wiring Specications and Best Practices/Controller Options 40

Indoor Unit Electrical Connections Guidelines ........................................................................................................... 41

Indoor Unit Electrical Connections Procedure ............................................................................................................ 42

Self Diagnosis Functions ........................................................................................................................................... 44

LG SIMS - Self Diagnosis Functions ......................................................................................................................... 46

Optional Wall-Mounted Sensor and Controller ........................................................................................................... 48

Troubleshooting ............................................................................................................................................. 49

Error Codes ............................................................................................................................................................... 49

Cautions for Refrigerant leaks ....................................................................................................................... 51

Refrigerant Leaks ....................................................................................................................................................... 51

Installation Checklist ...................................................................................................................................... 52

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

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SAFETY INSTRUCTIONS

WARNING

DANGER

WARNING

CAUTION

DANGER

The instructions below must be followed to prevent product malfunction, property damage, injury or death to the user or other people. Incorrect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the symbols below.

TABLE OF SYMBOLS

This symbol indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

This symbol indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

This symbol indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

Note:

This symbol Indicates situations that may result in equipment or property damage accidents only.

This symbol indicates an action that should not be performed.

INSTALLATION

Don’t use or store ammable gas or combustibles near the unit.

There is risk of re, explosion, and physical injury or death.

Do not install, remove, or re-install the unit by yourself (end-user). Ask the dealer or an LG trained technician to install the unit.

Improper installation by the user may result in water leakage, re, explosion, electric shock, physical injury or death.

For replacement of an installed unit, always contact an LG trained service provider.

There is risk of re, electric shock, explosion, and physical injury or death.

Multi F Standard Wall-Mounted Indoor Unit

The outdoor unit is shipped with refrigerant and the service valves closed. Do not open service valves on the unit until all non-condensibles have been removed from the piping system and authorization has been obtained from the commissioning agent.

There is a risk of physical injury or death.

Do not run the compressor with the service valves closed.

There is risk of explosion, physical injury, or death.

Periodically check that the outdoor unit is not damaged.

There is risk of explosion, physical injury, or death.

Replace all control box and panel covers.

If cover panels are not installed securely, dust, water and animals may

enter the unit, causing re, electric shock, and physical injury or death.

Always check for system refrigerant leaks after the unit has been installed or serviced.

Exposure to high concentration levels of refrigerant gas may lead to illness or death.

Do not install the unit using defective hanging, attaching, or mounting hardware.

There is risk of physical injury or death.

Wear protective gloves when handling equipment.

Sharp edges may cause personal injury.

Dispose of the packing materials safely.

• Packing materials, such as nails and other metal or wooden parts may cause puncture wounds or other injuries.

• Tear apart and throw away plastic packaging bags so that children may not play with them and risk suffocation and death.

Do not install the unit in any location exposed to open ame

or extreme heat. Do not touch the unit with wet hands.

There is risk of re, electric shock, explosion, and physical injury or death.

Install the unit considering the potential for earthquakes.

Improper installation may cause the unit to fall, resulting in physical injury or death.

Do not change the settings of the protection devices.

If the pressure switch, thermal switch, or other protection device is shorted and forced to operate improperly, or parts other than those

specied by LG are used, there is risk of re, electric shock, explosion,

and physical injury or death.

If the air conditioner is installed in a small space, take measures to prevent the refrigerant concentration from exceeding safety limits in the event of a refrigerant leak.

Consult the latest edition of ASHRAE (American Society of Heating, Refrigerating, and Air Conditioning Engineers) Standard 15. If the re-

frigerant leaks and safety limits are exceeded, it could result in personal injuries or death from oxygen depletion.

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

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CAUTION

SAFETY INSTRUCTIONS

INSTALLATION – CONTINUED

Be very careful when transporting the product.

• Do not attempt to carry the product without assistance.

• Some products use polypropylene bands for packaging. Do not use polypropylene bands to lift the unit.

• Suspend the unit from the base at specified positions.

• Support the unit at a minimum of four points to avoid slippage from rigging apparatus.

• Failure to follow these directions may result in minor or moderate physical injury.

Note:

Properly insulate all cold surfaces to prevent “sweating.”

Cold surfaces such as uninsulated pipe can generate condensate that may drip and cause a slippery oor condition and/or water damage to walls.

When installing the unit in a hospital, mechanical room, or

similar electromagnetic eld (EMF) sensitive environment, provide sufcient protection against electrical noise.

Inverter equipment, power generators, high-frequency medical equipment, or radio communication equipment may cause the air conditioner to operate improperly. The unit may also affect such equipment by creating electrical noise that disturbs medical treatment or image broadcasting.

Do not use the product for special purposes such as preserving foods, works of art, wine coolers, or other precision air conditioning applications. This equipment is designed to provide comfort cooling and heating.

There is risk of property damage.

Do not make refrigerant substitutions. Use R410A only.

If a different refrigerant is used, or air mixes with original refrigerant, the unit will malfunction and become damaged.

Do not install the unit in a noise sensitive area.

When connecting refrigerant tubing, remember to allow for pipe expansion.

Improper piping may cause refrigerant leaks and system malfunction.

Take appropriate actions at the end of HVAC equipment life to recover, recycle, reclaim or destroy R410A refrigerant according to applicable U.S. Environmental Protection Agency (EPA) rules.

Periodically check that the outdoor unit is not damaged.

There is a risk of equipment damage.

Install the unit in a safe location where no one can step on or fall onto it. Do not install the unit with defective hanging, attaching, or mounting hardware.

There is risk of unit and property damage.

Install the drain hose to ensure adequate drainage.

There is a risk of water leakage and property damage.

Don’t store or use ammable gas / combustibles near the

unit.

There is risk of product failure.

Always check for system refrigerant leaks after the unit has been installed or serviced.

Low refrigerant levels may cause product failure

The unit is shipped with refrigerant and the service valves closed. Do not open service valves on the unit until all noncondensibles have been removed from the piping system and authorization to do so has been obtained from the commissioning agent.

There is a risk of refrigerant contamination, refrigerant loss and equipment damage.

Installation Manual

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

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SAFETY INSTRUCTIONS

DANGER

WARNING

WIRING

High voltage electricity is required to operate this system. Adhere to the National Electrical Codes and these instructions when wiring.

Improper connections and inadequate grounding can cause accidental injury or death.

Always ground the unit following local, state, and National Electrical Codes.

The information contained in this manual is intended for use by an experienced, trained electrician familiar with the U.S. National Electric Code (NEC) who is equipped with the proper tools and test instruments.

Failure to carefully read and follow all instructions in this manual can result in equipment malfunction, property damage, personal injury or death.

Ensure the unit is connected to a dedicated power source that provides adequate power.

If the power source capacity is inadequate or the electric work is not per-

formed properly, it may result in re, electric shock, physical injury or death.

Turn the power off at the nearest disconnect before servicing the equipment.

Electric shock can cause physical injury or death.

Properly size all circuit breakers or fuses.

There is risk of re, electric shock, explosion, physical injury or death.

Refer to local, state, and federal codes, and use power wires

of sufcient current capacity and rating.

Wires that are too small may generate heat and cause a re.

Secure all eld wiring connections with appropriate wire

strain relief.

Improperly securing wires will create undue stress on equipment power

lugs. Inadequate connections may generate heat, cause a re and

physical injury or death.

Properly tighten all power connections.

Loose wiring may overheat at connection points, causing a re, physical

injury or death.

Note:

Do not cut, lengthen or shorten the communications and power cable between any dry contact unit and its connected indoor unit. Do not install the unit in a location where the communications and power cable cannot be safely and easily connected between the two units. Do not allow strain on this cable.

Poor cable connections can cause equipment malfunction.

Multi F Standard Wall-Mounted Indoor Unit

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

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DANGER

WARNING

CAUTION

SAFETY INSTRUCTIONS

OPERATION

Do not provide power to or operate the unit if it is ooded or

submerged.

There is risk of re, electric shock, physical injury or death.

Use a dedicated power source for this product.

There is risk of re, electric shock, physical injury or death.

Do not operate the disconnect switch with wet hands.

There is risk of re, electric shock, physical injury or death.

Do not allow water, dirt, or animals to enter the unit.

There is risk of unit failure, re, electric shock, physical injury or death.

Avoid excessive cooling and periodically perform ventilation to the unit.

Inadequate ventilation is a health hazard.

Do not touch the refrigerant piping during or after operation.

It can cause burns or frostbite.

Do not operate the unit with the panel(s) or protective cover(s) removed; keep ngers and clothing away from moving parts.

The rotating, hot, cold, and high-voltage parts of the unit can cause physical injury or death.

Periodically check power cable and connection for damage.

Cable must be replaced by the manufacturer, its service agent, or similar qualied persons in order to avoid physical injury and/or electric shock.

Do not open the inlet grille of the unit during operation. Do

Periodically verify the hanging bolts and other hardware securing the unit have not deteriorated.

If the unit falls from its installed location, it can cause property damage, product failure, physical injury or death.

If refrigerant gas leaks out, ventilate the area before operating the unit.

If the unit is mounted in an enclosed, low-lying, or poorly ventilated area

and the system develops a refrigerant leak, it may cause re, electric

shock, explosion, physical injury or death.

not operate the unit with the panels or guards removed. Do not insert hands or other objects through the inlet or outlet

when the unit is powered. Do not touch the electrostatic lter,

if the unit includes one. The unit contains sharp, rotating, hot, and high voltage parts that can cause personal injury

and/or electric shock.

Ensure no power is connected to the unit other than as directed in this manual. Remove power from the unit before removing or servicing the unit.

There is risk of unit failure, re, electric shock, physical injury or death.

Do not open the inlet grille of the unit during operation. Do not operate the unit with the panels or guards removed. Do not insert hands or other objects through the inlet or outlet with the unit is plugged in. Do not touch the electrostatic

lter, if the unit includes one.

The unit contains sharp, rotating, hot, and high voltage parts that can cause personal injury and/or electric shock.

Securely attach the electrical cover to the unit.

Non-secured electrical covers can result in burns or electric shock due to dust or water in the service panel.

Installation Manual

To avoid physical injury, use caution when cleaning or servicing the air conditioner.

Note:

Clean up the site after installation is nished, and check

that no metal scraps, screws, or bits of wiring have been left inside or surrounding the unit.

Do not use this equipment in mission critical or specialpurpose applications such as preserving foods, works of art, wine coolers or refrigeration. This equipment is designed to provide comfort cooling and heating.

Provide power to the compressor crankcase heaters at least six (6) hours before operation begins.

Starting operation with a cold compressor sump(s) may result in severe bearing damage to the compressor(s). Keep the power switch on during

the operational season.

Do not block the inlet or outlet.

Unit may malfunction.

Securely attach the electrical cover to the indoor unit. Non-

secured covers can result in re due to dust or water in the

service panel.

Periodically verify the equipment mounts have not deteriorated.

If the base collapses, the unit could fall and cause property damage or product failure.

Do not allow water, dirt, or animals to enter the unit.

There is risk of unit failure.

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

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Multi F Standard Wall-Mounted Indoor Unit

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

MUL

WARNING

INTRODUCTION

Multi F and Multi F MAX Standard Wall-Mounted Units

This manual describes how to install the LG Multi F and Multi F MAX (Multi Zone) Standard Wall-Mounted Indoor Units (IDU) for Multi F heat pump systems. Table 1 lists the available models. Refer to LG’s Multi F Indoor Unit Engineering Manual for complete detailed engineering data and selection procedures.

Safety

Safety of personnel is the primary concern during all procedures. Read and understand the safety summary at the front of this manual. Read and understand this installation procedure before beginning installation. Use the appropriate tools and accessories during installation. Plan your work and do not work alone, if possible. Know how to obtain emergency medical and fire fighting assistance.

Installation Personnel

This equipment is intended for installation by personnel trained in the required construction, mechanical, electrical, and/or other disciplines.

Applicable Codes

Personnel must be familiar with and follow the applicable national, state, and/or local codes. In the event of a conflict between any applicable code and the instructions in this manual, comply with the applicable code.

Figure 1: Typical Multi F Standard Wall-Mounted Indoor Unit

Installation Manual

Installation work must be performed by trained personnel and in accordance with national wiring standards and all local or other

applicable codes. Improper installation can result in re, electric shock,

physical injury, or death.

Note:

Please read all instructions before installing this product. Become familiar

with the unit’s components and connections, and the order of installation. Incorrect installation can degrade or prevent proper operation.

Required Tools (field provided)

Required Parts (field provided)

• Level

• Screwdriver

• Electrical lineman pliers

• Electric drill

• Hole saw

• Connecting cable (power and control)

• Pipes - vapor line and liquid line, with insulation

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

• Drill

• Flaring tool set

• Tubing cutter

• Tube/pipe reamer

• Torque wrenches

• 3/8” or 1/2” Threaded hanger rods

• 3/8” or 1/2” nuts, at washers, and lock/split washers

• Allen wrench

• Gas-leak detector

• Thermometer

• Insulated drain hose

• Additional drain hose

MUL

INTRODUCTION

Table 1: Multi F Standard Wall-Mounted Indoor Units

Typical Unit Model Number

LMN077HVT 7,000 8,100

LSN090HSV4 9,000 10,400

LSN120HSV4 12,000 13,800

LMN157HVT 14,300 16,500

LSN180HSV4 18,000 20,800

LMN247HVT 24,000 27,000

Nominal Capacity

Cooling (Btu) Heating (Btu)

Part Quantity Image

Installation Plate One (1)

Type “A” Screws Five (5)

Multi F Standard Wall-Mounted Indoor Unit

Type “B” Screws

(M4 x 12L)

Wireless

Controller with Holder

HVT: AKB73635606 HSV: AKB73835312

Two (2)

One (1)

Table 2: Included Items

7,000 ~ 15,000 Btu/h Indoor Units

18,000 and 24,000 Btu/h Indoor Units

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UNIT NOMENCLATURE

Multi F Multi-Zone Systems — Indoor Units

L = LG

Type: M = Multi-Zone

S = Single Zone (Gen 4 Single Zone units also compatible with Multi Zone)

Component:

AN: Art Cool™ Wall-Mounted Indoor Unit

N: Standard Wall-Mounted Indoor Unit

CN: Four-Way Ceiling-Cassette Indoor Unit

DN: Ceiling-Concealed Duct (Low Static) Indoor Unit

HN: Ceiling-Concealed Duct (High Static) Indoor Unit

VN: Vertical-Horizontal Air Handling Indoor Unit

N 157 HVT

Installation Manual

Nominal Capacity

(Nominal cooling capacity in Btu/h):

077 = 7,000

090 = 9,000

120 = 12,000

Features:

H = Heat Pump

V = Inverter

T = High Wall-Mounted Indoor Unit

P = Art Cool Gallery Indoor Unit

Generation

3 = Third (also Third Gen if no number in this position)

4 = Fourth

• Voltage for all equipment is 208-230V, 60 Hz, 1-phase.

• All indoor units are compatible with wired controllers

157 = 15,000

180 = 18,000

247 = 24,000

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

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GENERAL DATA

WARNING

R410A Refrigerant

R410A refrigerant has a higher operating pressure in comparison to R22 refrigerant and, therefore, all piping system materials installed must have a higher resisting pressure than the materials traditionally used in R22 systems.

R410A refrigerant is an azeotrope of R32 and R125, mixed at 50:50, so the ozone depletion potential (ODP) is 0.

• Do not place refrigerant cylinder in direct sunlight. Refrigerant cylinder may explode causing severe injury or death.

Note

• Because R410A is a combination of R32 and R125, the required additional refrigerant must be charged in its liquid state. If the refrigerant is charged in its gaseous state, its composition changes and the system will not work properly.

• Do not heat piping more than necessary during installation. Piping may become soft and fail when pressurized.

• Do not use any piping that has not been approved for use in high-pressure refrigerant systems. Piping wall thickness must comply

with the applicable local, state, and federal codes for the 551 psi design pressure of R410A. Inadequate piping may fail when

pressurized.

Allowable Indoor Unit to Outdoor Unit Connections

In Multi F/Multi Zone systems, the standard wall-mounted IDUs can be connected to the Multi F outdoor units (ODUs) listed in Table 3.

Table 3: Allowable Indoor Unit to Outdoor Unit Connections.

Indoor units Outdoor units

Model Number

LMN077HVT 7,000 O O O O O O

LSN090HSV4 9,000 O O O O O O

LSN120HSV4 12,000 O O O O O O

LMN157HVT 15,000 O O O O O O

Indoor Unit Nominal

Capacity (Btu/h)

LMU18CHV LMU24CHV LMU30CHV LMU36CHV LMU480HV LMU540HV

2 3 4 4 8 8

Multi F Standard Wall-Mounted Indoor Unit

LSN180HSV4 18,000 – O O O O O

LMN247HVT 24,000 – O O O O O

connection allowed: O connection not allowed: –

Device Connection Limitations

• The minimum number of connected and operating indoor units to Multi F / Multi F MAX systems is two.

• The maximum number of indoor units for each Multi F / Multi F MAX heat pump system is:

LMU18CHV = 2 LMU24CHV = 3 LMU30CHV = 4 LMU36CHV = 4 LMU480HV = 8 LMU540HV = 8

Maximum No. of Connectable Indoor Units

• The maximum allowable total indoor unit capacity (Btu/h) for each Multi F / Multi F MAX heat pump system is:

LMU18CHV = 24,000 LMU24CHV = 33,000 LMU30CHV = 40,000 LMU36CHV = 48,000 LMU480HV = 65,000 LMU540HV = 73,000

• Refer to the Multi F Engineering Manual to properly determine total indoor unit connected capacity.

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

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GENERAL DATA

Nominal Cooling Capacity

(Btu/h)

Nominal Heating Capacity

(Btu/h)

Operating Range

Cooling (°F WB) Heating (°F DB)

Fan

Type

Motor Output (W) x Qty. Motor/Drive Airflow Rate CFM (H/M/L)

Unit Data

Refrigerant Type

Refrigerant Control

Power Supply V, Ø, Hz3

Rated Amps (A)

Sound Pressure Level ±3 dB(A)

(H/M/L)4

Dimensions (W x H x D, in.)

Net Unit Weight (lbs.)

Shipping Weight (lbs.)

Power Wiring / Communications

Cable (No. x AWG)5

Heat Exchanger (Row x Column

x Fin / inch) x Number

Pipe Size

Liquid (in.)

Vapor (in.)

Connection Size

Liquid (in.)

Vapor (in.)

Drain O.D. / I.D. (in.)

Nominal capacity is rated 0 ft. above sea level with corresponding refrigerant piping length in accordance with standard length of each outdoor unit and a 0 ft. level difference between outdoor and indoor units. All capacities are net with a combination ratio between 95 – 105%.

Nominal cooling capacity rating obtained with air entering the indoor unit at 80ºF dry bulb (DB) and 67ºF wet bulb (WB) and outdoor ambient conditions of 95ºF dry bulb (DB) and 75ºF wet bulb (WB).

Nominal heating capacity rating obtained with air entering the indoor unit at 70ºF dry bulb (DB) and 60ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB).

Table 4: Multi F Multi Zone Standard Wall-Mounted Indoor Unit Specications

Model Name LMN077HVT LSN090HSV4 LSN120HSV4 LMN157HVT LSN180HSV4 LMN247HVT

7,000 9,000 12,000 14,300 18,000 24,000

8,100 10,400 13,800 16,500 20,800 27,000

198 / 177 / 162 247 / 230 / 212 335 / 318 / 300 371 / 318 / 247 572 / 501 / 434 720 / 600 / 466

0.1 0.2 0.3

33 / 30 / 26 33 / 30 / 27 39 / 36 / 31 43 / 39 / 34 37 / 33 / 28 42 / 39 / 36

35-1/4 x 11-3/8

x 8-9/32

23 20 20 23 31 32

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

34-7/8 x 11-1/4

x 8-1/4

(2 x 16 x 23) x 1 (3 x 18 x 22) x 1

Specications

57-77

59-81

Cross Flow

14.4 x 1 76.0 x 1

Brushless Digitally Controlled / Direct

R410A

Electronic Expansion Valve (EEV)

208-230, 1, 60

34-7/8 x 11-1/4

x 8-1/4

26 36 37

3/8 1/2

1/4 3/8 1/4

3/8 5/8 1/2

This unit comes with a dry helium charge.

Acceptable operating voltage: 187V-253V.

Sound pressure levels are tested in an anechoic chamber under ISO Standard 3745 and are the same in both cooling and heating mode. These values can increase due to ambient conditions during operation.

All power wiring / communications cable to be minimum 18 AWG, 4-conductor, stranded, shielded, and must comply with applicable local and national codes.

35-1/4 x 11-3/8

4 x 18

1/4

27/32, 5/8

x 8-9/32

40-9/16 x 12-13/16

x 9-13/16

40-9/16 x 12-25/32

x 9-27/32

Installation Manual

MUL

GENERAL DATA

Heating

Cooling

Evaporator Inlet Temperature

Thermistor for

Heat Exchanger

Cross Flow Fan

Thermistor for Evaporator

Outlet Temperature

Gas pipe connection port (flare connection)

Indoor Air Temperature

Thermistor for

Multi F Standard Wall-Mounted Indoor Unit

Table 5: Multi F Multi Zone Standard Wall-Mounted Indoor Unit Refrigerant Pipe Connection Port Diameters

Model No. Vapor (inch) Liquid (inch)

LMN077HVT

LSN090HSV4

LSN120HSV4

LMN157HVT

LSN180HSV4 Ø5/8 Ø3/8

LMN247HVT Ø1/2 Ø1/4

Liquid pipe connection port (flare connection)

Ø3/8 Ø1/4

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

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Max. 49.2 feet

Max. 24.6 feet

ODU

GENERAL DATA

Typical Multi F/Multi F Max Systems

Major System Components

A typical Multi F system consists of an outdoor unit (ODU), refrigerant piping, and two to four indoor units (IDUs). The standard wall-mounted units described in this manual are one of the types of IDUs that can be connected to a Multi F system.

A typical Multi F Max system consists of an ODU, refrigerant piping, one or two branch distribution units (BDU), and two to eight IDUs. The standard wall-mounted units described in this manual are one of the types of IDUs that can be connected to a Multi F Max system.

Typical Multi F System

Example: LMU36CHV outdoor unit with four (4) indoor units connected.

ODU: Outdoor Unit.

IDU: Indoor Unit.

A, B, C, D: Piping from Outdoor Unit to Indoor Unit.

Installation Manual

Table 6: Multi F Outdoor Unit Refrigerant Piping System Limitations.

Outdoor

Unit

LMU18CHV 10 82 82 - - 164

LMU24CHV 10 82 82 82 - 246.1

LMU36CHV 10 82 82 82 82 246.1

Minimum Length for Each

Pipe Segment (ft.)

Maximum Equivalent Pipe Length

to Each Indoor Unit (ft.)

A B C D

Maximum Equivalent Pipe Length

for Each System (ft.)

Typical Multi F MAX System with One Branch Distribution Unit

Example: LMU540HV outdoor unit with four (4) indoor units, and one (1) branch distribution unit connected.

ODU: Outdoor Unit.

IDU: Indoor Unit.

BDU: Branch Distribution Unit.

A: Main Piping.

B: Branch Piping (Branch Distribution Unit to Indoor Unit[s]).

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

h1 ≤ 98.4 feet

BDU

h3 ≤ 32.8 feet

IDU

h2 ≤ 49.2 feet

IDU

MUL

GENERAL DATA

ODU

Typical Multi F/Multi F Max Systems

Typical Multi F MAX System with Two Branch Distribution Units

Example: LMU540HV outdoor unit with seven (7) indoor units, and two (2) branch distribution units connected.

ODU: Outdoor Unit.

IDU: Indoor Unit.

BD: Branch Distribution Unit(s).

ΣA: Main Piping.

ΣB: Branch Piping (Branch Distribution Unit[s]

to Indoor Unit[s]).

h4 ≤ 49.2 feet

h1 ≤ 98.4 feet

BDU Y-Branch

BDU

IDU

h3 ≤ 32.8 feet

h2 ≤ 49.2 feet

Table 7: Multi F MAX Outdoor Unit Refrigerant Piping System Limitations.

Pipe Length

(ELF = Equivalent

Length of pipe

in Feet)

Multi F Standard Wall-Mounted Indoor Unit

Elevation Differential

(All Elevation

Limitations are

Measured in Actual Feet)

(Outdoor Unit to Branch

Distribution Units: ΣA)

(Branch Distribution Units

to Indoor Units: B)

If outdoor unit is above or below indoor unit (h1)

Between the farthest two indoor units (h2)

Between branch distribution unit and farthest

Between branch distribution units (h4)

Total piping length (ΣA + ΣB)

Main pipe

Total branch piping length (ΣB)

Branch pipe

connected indoor unit(s) (h3)

Minimum

Maximum

Minimum

Maximum

≤475.7 feet

10 feet

≤180.4 feet

≤295.3 feet

10 feet

≤49.2 feet

≤98.4 feet ≤42.9 feet

≤32.8 feet

≤42.9 feet

Table 8: Multi F MAX Piping Sizes.

Piping

Liquid Ø3/8

Main Pipe A

(inch)

Gas Ø3/4

Depends on the size

of the indoor unit piping

IDU

Branch Pipe B

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

MUL

GENERAL DATA

Refrigerant Piping Requirements

Field Supplied Refrigerant Piping

Type ACR copper is the only approved refrigerant pipe material for use with LG Multi F air conditioning products. ACR rated tubing 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. Tube wall thickness should meet local code requirements and be approved for a maximum operating pressure of 551 psi.

Refer to the refrigerant piping section (starting on page 22) of the General Installation Guidelines for more information on piping.

Using Refrigerant Components

Field-supplied elbows are allowed if they are long radius and designed for use with R410A refrigerant. Be sure to account for the additional pressure losses in equivalent pipe length calculations for each elbow, y-branch, and branch distribution unit. The equivalent pipe length of each elbow, Y-branch, and/or branch distribution unit must be added to each pipe segment to ensure maximum lengths are not exceeded.

Table 9: Equivalent Piping Length for Elbows,

Y-branches, and Branch Distribution Units.

Component

Size (Inches)

1/4 3/8 1/2 5/8 3/4

Installation Manual

Elbow (ft.)

Y-Branch Kit (ft.)

(Multi F MAX systems only)

Branch Distribution Unit (ft.)

(Multi F MAX systems only)

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

0.5 0.6 0.7 0.8 1.2

1.6

8.2

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

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