LG LSN180HSV4, LSN090HSV4, LSN120HSV4, LMN158HVT, LMN248HVT User Manual

MULTI F

MULTI F MAX

STANDARD WALL-MOUNTED INDOOR UNIT INSTALLATION MANUAL

•	LMN078HVT	7 kBtu
•	LSN090HSV4	9 kBtu
•	LSN120HSV4	12 kBtu
•	LMN158HVT	15 kBtu
•	LSN180HSV4	18 kBtu
•	LMN248HVT	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 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. 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_MultiF_StdWallMount_11_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.

MULTI F	TABLE OF CONTENTS
MULTI F MAX

CONTENTS
Safety Instructions	4
Introduction.........................................................................................................................	9
Unit Nomenclature............................................................................................................	11
General Data.....................................................................................................................	12
Specifications..............................................................................................................................	13
Typical Multi F/Multi F Max Systems	15
Refrigerant Piping Requirements	17
General Installation Guidelines	18
Location Selection.......................................................................................................................	18
Inspection....................................................................................................................................	19
Install Wall-Mounted IDU Chassis	20
Refrigerant Piping.......................................................................................................................	22
Piping Materials and Handling	30
Piping Preparation.......................................................................................................................	31
Piping Connections...........................................................................................................	32
IDU to ODU.................................................................................................................................	32
Piping Insulation..........................................................................................................................	35
Drain Piping.................................................................................................................................	37
Electrical Wiring................................................................................................................	38
Power Wiring Specifications and Best Practices	39
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	50
Refrigerant Leaks........................................................................................................................	50

Installation Checklist 51

Manual Installation

Due to our policy of continuous product innovation, some specifications may change without notification.	3
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

SAFETY INSTRUCTIONS	MULTI F
	MULTI F MAX

Multi F Standard Wall-Mounted Indoor Unit

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

		DANGER	This symbol indicates an imminently hazardous situation which, if not avoided, will result in death or
			serious injury.
		WARNING	This symbol indicates a potentially hazardous situation which, if not avoided, could result in death or
			serious injury.
		CAUTION	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
	DANGER
	Don’t use or store flammable gas or combustibles near the unit.
	There is risk of fire, explosion, and physical injury or death.
	WARNING			Do not install the unit using defective hanging, attaching,
	Do not install, remove, or re-install the unit by yourself			or mounting hardware.
				There is risk of physical injury or death.
	(end-user). Ask the dealer or an LG trained technician to
				Wear protective gloves when handling equipment.
	install the unit.
	Improper installation by the user may result in water leakage, fire,			Sharp edges may cause personal injury.
	explosion, electric shock, physical injury or death.			Dispose of the packing materials safely.
	For replacement of an installed unit, always contact an
				• Packing materials, such as nails and other metal or wooden parts
	LG trained service provider.			may cause puncture wounds or other injuries.
	There is risk of fire, electric shock, explosion, and physical injury or death.			• Tear apart and throw away plastic packaging bags so that children
	The outdoor unit is shipped with refrigerant and the service			may not play with them and risk suffocation and death.
	valves closed. Do not open service valves on the unit until			Do not install the unit in any location exposed to open
	all non-condensibles have been removed from the piping			flame or extreme heat. Do not touch the unit with wet hands.
	system and authorization has been obtained from the com-			There is risk of fire, electric shock, explosion, and physical injury or death.
	missioning agent.			Install the unit considering the potential for earthquakes.
	There is a risk of physical injury or death.
				Improper installation may cause the unit to fall, resulting in physical
	Do not run the compressor with the service valves
				injury or death.
	closed.			Do not change the settings of the protection devices.
	There is risk of explosion, physical injury, or death.
				If the pressure switch, thermal switch, or other protection device is
	Periodically check that the outdoor unit is not damaged.
				shorted and forced to operate improperly, or parts other than those
	There is risk of explosion, physical injury, or death.			specified by LG are used, there is risk of fire, electric shock, explosion,
	Replace all control box and panel covers.			and physical injury or death.
				If the air conditioner is installed in a small space, take mea-
	If cover panels are not installed securely, dust, water and animals may
	enter the unit, causing fire, electric shock, and physical injury or death.			sures to prevent the refrigerant concentration from exceed-
				ing safety limits in the event of a refrigerant leak.

	Always check for system refrigerant leaks after the unit has	Consult the latest edition of ASHRAE (American Society of Heating,
	been installed or serviced.
		Refrigerating, and Air Conditioning Engineers) Standard 15. If the re-
	Exposure to high concentration levels of refrigerant gas may lead to
		frigerant leaks and safety limits are exceeded, it could result in personal
	illness or death.
		injuries or death from oxygen depletion.

4	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.

MULTI F	SAFETY INSTRUCTIONS
MULTI F MAX
INSTALLATION – CONTINUED
CAUTION

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 floor condition and/or water damage to walls.

When installing the unit in a hospital, mechanical room, or similar electromagnetic field (EMF) sensitive environment, provide sufficient 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 flammable 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 non-condensibles 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.

Manual Installation

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©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

Multi F Standard Wall-Mounted Indoor Unit

SAFETY INSTRUCTIONS	MULTI F
	MULTI F MAX

WIRING

DANGER

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.

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 fire, electric shock, explosion, physical injury or death.

WARNING

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 performed properly, it may result in fire, electric shock, physical injury or death.

Refer to local, state, and federal codes, and use power wires of sufficient current capacity and rating.

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

Secure all field 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 fire and physical injury or death.

Properly tighten all power connections.

Loose wiring may overheat at connection points, causing a fire, 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.

6	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.

MULTI F	SAFETY INSTRUCTIONS
MULTI F MAX

OPERATION

DANGER

Do not provide power to or operate the unit if it is flooded or submerged.

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

Use a dedicated power source for this product.

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

Do not operate the disconnect switch with wet hands.

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

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 fire, electric shock, explosion, physical injury or death.

WARNING

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

There is risk of unit failure, fire, 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 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 fingers 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 qualified persons in order to avoid physical 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.

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 when the unit is powered. Do not touch the electrostatic filter, 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, fire, 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 filter, if the unit includes one.

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

CAUTION

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

Note:

Clean up the site after installation is finished, 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. Nonsecured covers can result in fire 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.

Manual Installation

Due to our policy of continuous product innovation, some specifications may change without notification.	7
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

MULTI F

MULTI F MAX

Multi F Standard Wall-Mounted Indoor Unit

8	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.

MULTI F	INTRODUCTION
MULTI F MAX

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	Figure 1: Typical Multi F Standard Wall-Mounted Indoor Unit
procedures. Read and understand the safety summa-
ry at the front of this manual. Read and understand
this installation procedure before beginning instal-
lation. 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 firefighting 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.

WARNING

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 fire, 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)

•	Level	•	Drill	•	Allen wrench
•	Screwdriver	•	Flaring tool set	•	Gas-leak detector
•	Electrical lineman pliers	•	Tubing cutter	•	Thermometer
•	Electric drill	•	Tube/pipe reamer
•	Hole saw	•	Torque wrenches

Required Parts (field provided)

•	Connecting cable (power and control)	•	Insulated drain hose
•	Pipes - vapor line and liquid line, with	•	Additional drain hose
	insulation

Manual Installation

Due to our policy of continuous product innovation, some specifications may change without notification.	9
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

Multi F Standard Wall-Mounted Indoor Unit

INTRODUCTION					MULTI F
					MULTI F MAX
	Table 1: Multi F Standard Wall-Mounted Indoor Units
Typical Unit		Model Number		Nominal Capacity
				Cooling (Btu)		Heating (Btu)
		LMN078HVT		7,000		8,100
		LSN090HSV4		9,000		10,400
		LSN120HSV4		12,000		13,800
		LMN158HVT		14,300		16,500
		LSN180HSV4		18,000		20,800
		LMN248HVT		24,000		27,000

		Table 2: Included Items
Part	Quantity	Image
Installation Plate	One (1)
		7,000 ~ 15,000 Btu/h Indoor Units 18,000 and 24,000 Btu/h Indoor Units
Type “A” Screws	Five (5)

	Type “B” Screws	Two (2)
	(M4 x 12L)

Wireless

Controller with Holder One (1)

HVT: AKB73635606

HSV: AKB73835312

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	©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

MULTI F	UNIT NOMENCLATURE
MULTI F MAX

Multi F Multi-Zone Systems — Indoor Units

L		M		N		158		HVT

L = LG

Type: M = Multi-Zone

A/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

Nominal Capacity

(Nominal cooling capacity in Btu/h):

078	= 7,000	158 = 15,000
090	= 9,000	180 = 18,000
120	= 12,000	248 = 24,000

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

Manual Installation

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©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

Multi F Standard Wall-Mounted Indoor Unit

GENERAL DATA	MULTI F
	MULTI F MAX

R410A Refrigerant

R410A refrigerant has a higher operating pressure in comparison to R22 refrigerant. 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. The ozone depletion potential (ODP) is 0.

WARNING

• 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
	Indoor Unit Nominal	LMU18CHV	LMU24CHV		LMU30CHV	LMU36CHV		LMU480HV	LMU540HV
Model Number			Maximum No. of Connectable Indoor Units
	Capacity (Btu/h)
		2	3		4	4		8	8
LMN078HVT	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
LMN158HVT	15,000	O	O		O	O		O	O
LSN180HSV4	18,000	–	O		O	O		O	O
LMN248HVT	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

• 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.

12	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.

MULTI F	GENERAL DATA
MULTI F MAX	Specifications

Table 4: Multi F Multi Zone Standard Wall-Mounted Indoor Unit Specifications

Model Name	LMN078HVT	LSN090HSV4		LSN120HSV4		LMN158HVT	LSN180HSV4		LMN248HVT
Nominal Cooling Capacity	7,000	9,000		12,000		14,300	18,000		24,000
(Btu/h)1
Nominal Heating Capacity	8,100	10,400		13,800		16,500	20,800		27,000
(Btu/h)1
Operating Range
Cooling (°F WB)			57-77
Heating (°F DB)			59-81
Fan
Type				Cross Flow
Motor Output (W) x Qty.		14.4 x 1					76.0 x 1
Motor/Drive				Brushless Digitally Controlled / Direct
Airflow Rate CFM (H/M/L)	198 / 177 / 162	247 / 230 / 212		335 / 318 / 300		371 / 318 / 247	572 / 501 / 434		720 / 600 / 466
Unit Data
Refrigerant Type2				R410A
Refrigerant Control				Electronic Expansion Valve (EEV)
Power Supply V, Ø, Hz3			208-230, 1, 60
Rated Amps (A)		0.2						0.3
Sound Pressure Level ±3 dB(A)	33 / 30 / 26	33 / 30 / 27		39 / 36 / 31		43 / 39 / 34	37 / 33 / 28		42 / 39 / 36
(H/M/L)4
Dimensions (W x H x D, in.)	35-1/4 x 11-3/8	34-13/16 x 11-1/4		34-13/16 x 11-1/4		35-1/4 x 11-3/8	40-9/16 x 12-13/16		40-9/16 x 12-13/16
	x 8-9/32	x 8-1/4		x 8-1/4		x 8-9/32	x 9-13/16		x 9-13/16
Net Unit Weight (lbs.)	23	20		20		23		31
Shipping Weight (lbs.)			26				36		37
Power Wiring / Communications				4 x 18
Cable (No. x AWG)5
Heat Exchanger (Row x Column		(2 x 16 x 23) x 1					(3 x 18 x 22) x 1
x Fin / inch) x Number
Pipe Size
Liquid (in.)			1/4
Vapor (in.)		3/8						1/2
Connection Size
Liquid (in.)		1/4					3/8		1/4
Vapor (in.)		3/8					5/8		1/2
Drain O.D. / I.D. (in.)			27/32, 5/8

1Nominal 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).

2This unit comes with a dry helium charge.

3Acceptable operating voltage: 187V-253V.

4Sound 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.

5All power wiring / communications cable to be minimum 18 AWG, 4-conductor, stranded, shielded, and must comply with applicable local and national codes.

Manual Installation

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©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

Multi F Standard Wall-Mounted Indoor Unit

GENERAL DATA	MULTI F
	MULTI F MAX

Refrigerant Piping
		Heat Exchanger		Gas pipe connection port
				(flare connection)
Heating	Cooling	Cross Flow Fan	Thermistor for Evaporator
			TemperatureAir Indoor	(flare connection)
	forThermistor TemperatureInletEvaporator
		M	Outlet Temperature
				Thermistorfor
				Liquid pipe connection port

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

	Model No.	Vapor (inch)	Liquid (inch)
	LMN078HVT
	LSN090HSV4	Ø3/8	Ø1/4
	LSN120HSV4
	LMN158HVT
	LSN180HSV4	Ø5/8	Ø3/8
	LMN248HVT	Ø1/2	Ø1/4
	Table 6: Multi F Multi Zone Standard Wall-Mounted Indoor Unit Refrigerant Pipe Sizes
	Model No.	Vapor (inch, OD)	Liquid (inch, OD)
	LMN078HVT
	LSN090HSV4	Ø3/8	Ø1/4
	LSN120HSV4
	LMN158HVT
	LSN180HSV4	Ø1/2	Ø1/4
	LMN248HVT

14	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.

MULTI F	GENERAL DATA
MULTI F MAX	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.

		A
	Max. 49.2 feet	B
		Max. 24.6 feet
		C
		D

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

Outdoor	Minimum Length for Each		Maximum Equivalent Pipe Length					Maximum Equivalent Pipe Length
				to Each Indoor Unit (ft.)
Unit	Pipe Segment (ft.)							for Each System (ft.)
		A		B	C		D
LMU18CHV	9.8	82		82	-		-	164
LMU24CHV	9.8	82		82	82		-	246.1
LMU30CHV	9.8	82		82	82		82	246.1
LMU36CHV	9.8	82		82	82		82	246.1

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]).

ODU

IDU

A	BDU	B

		B	IDU	h2 ≤ 49.2 feet
				IDU
h1 ≤ 98.4 feet	h3 ≤ 32.8 feet	B

B

IDU

Manual Installation

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Multi F Standard Wall-Mounted Indoor Unit

GENERAL DATA	MULTI F
Typical Multi F/Multi F Max Systems	MULTI F MAX

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]).

ODU
A
Y-Branch	BDU	IDU
		B
A		B	IDU		feet
					≤ 32.8
				IDU
h4 ≤ 49.2 feet					h3
		B
A		IDU			feet
	BDU	B			h2 ≤ 49.2
		B	IDU
				IDU
h1 ≤ 98.4 feet
		B
		B
				IDU

Table 8: Multi F MAX Outdoor Unit Refrigerant Piping System Limitations.

		Total piping length (ΣA+ ΣB)		≤475.7 feet
		Main pipe	Minimum	9.8 feet
	Pipe Length	(Outdoor Unit to Branch
		Distribution Units: ΣA)	Maximum	≤180.4 feet
	(ELF = Equivalent
	Length of pipe
		Total branch piping	length (ΣB)	≤295.3 feet
	in Feet)
		Branch pipe	Minimum	9.8 feet
		(Branch Distribution Units
			Maximum
		to Indoor Units: B)		≤49.2 feet
	Elevation Differential	If outdoor unit is above or below indoor unit (h1)		≤98.4 feet
	(All Elevation	Between the farthest two indoor units (h2)		≤42.9 feet
	Limitations are	Between branch distribution unit and farthest		≤32.8 feet
	Measured in	connected indoor unit(s) (h3)
	Actual Feet)
		Between branch distribution units (h4)		≤42.9 feet

Table 9: Multi F MAX Piping Sizes.

	Piping	Main Pipe A	Branch Pipe B
		(inch)
	Liquid	Ø3/8	Depends on the size
	Gas	Ø3/4	of the indoor unit piping

16	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.

MULTI F	GENERAL DATA
MULTI F MAX	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 10: Equivalent Piping Length for Elbows,

Y-branches, and Branch Distribution Units.

	Component		Size (Inches)
		1/4	3/8	1/2	5/8	3/4
	Elbow (ft.)	0.5	0.6	0.7	0.8	1.2
	Y-Branch Kit (ft.)			1.6
	(Multi F MAX systems only)1
	Branch Distribution Unit (ft.)			8.2
	(Multi F MAX systems only)

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

Manual Installation

Due to our policy of continuous product innovation, some specifications may change without notification.	17
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.