LG Electronics is a global leader and technology innovator in consumer electronics, mobile communications, and home appliances.
LG Electronics comprises five business units—Home Entertainment,
Mobile Communications, Air Conditioning, Business Solutions, and
Home Appliance. LG is one of the world’s leading producers of flat
panel televisions, audio and video products, mobile handsets, air
conditioners, and washing machines. LG’s commercial air conditioning business unit was established in 1968 and has built its lineup of
residential and commercial products to include VRF, Multi F, ductfree split systems, packaged terminal air conditioners (PTACs), and
room air conditioners. In 2011, the air conditioning and energy solutions business unit grew to include LED lighting and solar products.
For more information, visit www.lg.com.
Multi-Zone Systems
LG HVAC systems offer a range of solutions that are cost efficient,
quiet and attractive. Multi-zone systems are “split” into indoor and
outdoor units, and provide a smart alternative to both central HVAC
and window-mounted air conditioners. These inverter heat pump systems are available in a variety of configurations to suit different cooling and heating situations. Installation by a trained HVAC contractor
is safe and easy – little to no duct work or sheet metal is required.
be used with different controllers, allowing the customer to set the
temperature individually. Indoor units are available in several different
congurations: Art Cool™ Mirror-mounted, Art Cool Gallery wall-
mounted, standard wall-mounted, low wall console, four-way ceiling
cassettes, ceiling-concealed duct (high and low static), and verticalhorizontal air handling models. Multi F MAX systems can operate up
to eight indoor units through two-, three-, or four-port branch distribution units.
Adaptable and Flexible
Multi F outdoor units can be adapted to a wide range of building ap-
plications and sizes such as schools, hotels, hospitals, ofces, and
residences. The system components are lightweight and compact so
they can be placed in buildings without expensive cranes, they easily
fit into most service elevators, and they can be set in place with
minimal structural reinforcements requirements.
Multi F technology allows you to pipe farther by reaching areas of the
building that would require the installation of a second system when
using traditional direct-expansion cooling and heating equipment. Multi
F provides the designer with uncompromised pipe system engineering
exibility—long pipe runs and large elevation differences. Whether your
building is a condominium, a hotel, a school, or an ofce complex, Multi
F is best suited to reach the farthest corners and elevations.
Multi F Systems
LG’s inverter heat pumps can support two, three, or four indoor
units that are typically installed in separate rooms. Indoor units can
Benefits of Multi F Systems
• Individual zone control
• Long refrigerant piping lengths
• High refrigerant piping elevation differences
• Maximum flexibility
• Operating ranges of 14°F to 118°F (DB) in cooling and -4°F to
75°F (DB) in heating if connected to standard Multi F Outdoor Units
or -13°F to 75°F (DB) in heating if connected to Multi F with LG
REDº Outdoor Units.
• Quiet and comfortable environment
Multi F and Multi F MAX Indoor Unit Engineering Manual
• Reduced ductwork
Smaller Chases and Plenums
LG Multi F systems use refrigerant piping to move heat, resulting in
smaller space requirements for piping as compared to chilled water
or roof top systems. This helps reduce the overall construction and
material cost of the building, and gives back leasable space. Flexible
and logical placement of system components, reduced back-andforth pipe lengths, and fewer joints lowers installation costs and
minimizes potential leaking.
Quality Commitment
LG is committed to the success of duct-free projects. We provide
technical support during installation and commissioning. LG offers
a variety of classes designed for
installers and servicers on Multi
F installation. Classes are conducted at LG’s training centers
and in field locations at various
times throughout the year and on
special request.
4 | INTRODUCTION
Due to our policy of continuous product innovation, some specications may change without notication.
Multi-Zone Systems — Indoor Units and Outdoor Units
L
L = LG
Type: M = Multi-Zone
Component:
AN: Art Cool™ Wall-Mounted Indoor Unit
N: Standard Wall-Mounted Indoor Unit
QN: Low Wall Console 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
U: Outdoor Unit
Nominal Capacity
(Nominal cooling capacity in Btu/h):
07 = 7,000
09 = 9,000
12 = 12,000
Generation
Features:
H = Heat Pump
V = Inverter
T = High Wall-Mounted Indoor Unit
P = Art Cool Gallery Indoor Unit
15 = 15,000
18 = 18,000
24 = 24,000
30 = 30,000
36 = 36,000
42 = 42,000
M
48 = 48,000
54 = 54,000
60 = 60,000
CN078HV
Introduction
Branch Distribution Units
P = Part (Accessory)
Type: M = Multi-Zone
BD: Branch Distribution Unit
Family
Number of Port Connections
(Maximum Number of Connectable Indoor Units): 2, 3, 4
• Voltage for all equipment is 208-230V, 60 Hz, 1-phase.
• All indoor units are compatible with wired controllers.
• All outdoor units are LGAP control network compatible with PI-485 V-net Control Integration Board (PMNFP14A1, sold separately).
• Compatible single zone IDU nomenclature is listed in the Single Zone Wall-Mounted IDU Engineering Manual.
Generation: 0, 1
P
Due to our policy of continuous product innovation, some specications may change without notication.
Drain pump
E.S.P. control
Electric heater
High ceiling
Hot Start
Self diagnostics
Soft Dry (dehumidification)
Auto operation
Auto clean (coil dry)
Auto restart
Operation
Child lock
Forced operation
Group control
Sleep mode
Timer (on/off)
Weekly schedule
Two thermistor control
7-Day programmable controller
Simple wired remote controller
Multi F and Multi F MAX Indoor Unit Engineering Manual
Embedded. Optional for HSD, LVNxxxHV4 4-way VAHU; LDN 9/12 MBH
LSD are compatible as of June 2018 production. Not available for 2-way
LMVNxxxHV VAHU. LMANxxxHVP Art Cool Gallery compatible as of
January 2019 production.
√ = Standard feature
o = Unit option
Page 7
MULTI
F
MAX
MULTI
F
Table 2: Indoor Unit Accessories Overview.
Model No.Description
For Four-Way Ceiling-Cassette Indoor Units
PT-QCHW0Ceiling Grille
PTDCQDecorative Cover
PRARH0Aux Heat Relay Kit
PWFMDD200Wi-Fi Module
For Wall-Mounted Indoor Units
PWFMDD200Wi-Fi Module
AG-9300-LGCondensate Sensor
PRARS1Aux Heat Relay Kit
For Low Wall Console Units
PWFMDD200Wi-Fi Module
AG-9300-LGCondensate Sensor
PRARH0Aux Heat Relay Kit
For Vertical-Horizontal Air Handing Units
PNDFJ0Downflow Conversion Kit (18/24/36MBH)
ANEH033B13 kW Electric Heater (18-36MBH)
ANEH053B15 kW Electric Heater (18-36MBH)
ANEH083B28 kW Electric Heater (18-36MBH)
ANEH103B210 kW Electric Heater (18-36MBH)
PRARH0Aux Heat Relay Kit
PWFMDD200Wi-Fi Module
For Ceiling-Concealed Duct (Low Static) Indoor Units
PWFMDD200Wi-Fi Module
For Ceiling-Concealed Duct (High Static) Indoor Units
ZFBXM101AHigh Efficiency Filter Box for LHN248HV
ZFBXM201AHigh Efficiency Filter Box for LHN368HV
ZFBXD201ADynamic V8 2VL Low Profile Air Cleaner
ZPLMV201ADynamic 2VL Air Cleaner Low Profile Return Air Plenum
ZFBXD402ADynamic V8 4VL Low Profile Air Cleaner
ZPLMV402ADynamic 4VL Air Cleaner Low Profile Return Air Plenum
ZFLT1301A4-Pack Dynamic V8 VL Air Cleaner Replacement Filter Pads
ZFLT1302A24-Pack Dynamic V8 VL Air Cleaner Replacement Filter Pads
ZGRLRA01ADynamic V8 Air Cleaner Louvered Return Air Grille (one per plenum )
ZGRLRA02ADynamic V8 Air Cleaner Egg Crate Return Air Grille (one per plenum)
PRARH0Aux Heat Relay Kit
PWFMDD200Wi-Fi Module
Controls Accessories
PQWRHQ0FDBWireless Handheld Remote (Duct/VAHU)
PREMTA000APremium Controller
PREMTC00USimple Controller
PREMTBVC0MultiSITE CRC1 Base Controller
PREMTBVC1MultiSITE CRC1 Plus Controller
“Air Velocity and Temperature Distribution” on page 18
“Refrigerant Flow Diagram” on page 19
“Wiring Diagram” on page 20
“Factory Supplied Parts and Materials” on page 21
“Installation and Best Layout Practices” on page 22
Page 10
ART COOL MIRROR INDOOR UNITS
MULTI
F
MAX
MULTI
F
Mechanical Specications and Features
ART COOL Mirror Wall-Mounted
Indoor Units
General
All LG indoor units are factory assembled, wired, piped, and provided with a control circuit board, fan, and motor. ART COOL Mirror
Wall-Mounted indoor units have a sound rating no higher than 44
dB(A) as tested per KSA0701 ISO Standard 3745.
Coil
Indoor unit coils are comprised of a minimum of two rows of
aluminum fins mechanically bonded to copper tubing. The coils are
pressure tested at the factory. Each unit is provided with a factory
installed condensate drain pan below the coil.
Refrigerant System
System is designed for use with R410A refrigerant. The refrigeration
circuit is pressure-tested at the factory and shipped with a holding
charge of helium gas. Refrigerant pipe connections are 45° flare.
All refrigerant lines from the outdoor unit to the indoor units must be
field insulated.
Electrical
Each indoor unit is designed to operate using 208–230/60/1 power
with voltage variances of ±10%.
Casing
Units are designed to mount on a vertical surface, and are shipped
with a separate back plate that secures the unit to the wall, protruding no more than nine (9) inches. Unit is designed so that refrigerant
piping can be installed in one (1) of four (4) different directions.
Finish
The Art Cool Mirror unit has a flat, architectural panel with a smoked
charcoal mirror finish. Unit casing has a dark grey finish and is
manufactured of heavy-duty acrylonitrile butadiene styrene (ABS)
and high impact polystyrene (HIPS) plastic.
Fan Assembly and Control
The unit has a single, direct-drive, crossow fan made of high strength
ABS plastic. The fan motor is brushless digitally controlled (BLDC)
with permanently lubricated and sealed ball bearings. The fan and
Multi F and Multi F MAX Indoor Unit Engineering Manual
motor assembly is mounted on vibration attenuating rubber grommets.
Fan speed is controlled using a microprocessor-based direct digitally
controlled algorithm that provides pre-programmed, eld-selectable
xed or auto fan speeds in the Heating and Cooling modes. For Art
Cool Mirror Wall-Mounted units, the indoor fan has Low, Med, High,
Jet Cool and Auto settings for Cooling mode; and has Low, Med, High,
Jet Heat and Auto settings for Heating mode. The Auto setting adjusts
the fan speed based on the difference between the controller setpoint
and space temperature. Also, the separate Chaos setting provides a
simultaneous and random change in fan speed and ow direction at
the discharge, simulating a natural outdoor breeze.
Air Filter
Return air inlet has a factory-supplied primary removable, washable
filter. The unit is also equipped with a secondary 3M Micro Dust
filter. Filters are accessed from the front of the unit without the use
of tools.
Airflow Guide Vanes
A motorized guide vane is factory installed, and allows the ability to
control the direction of airflow from side to side. A motorized louver
provides an automatic change in airflow by directing the air up and
down to provide uniform air distribution.
Microprocessor Control
The indoor unit is provided with an integrated control panel to communicate with the outdoor unit. All unit operation parameters are
stored in non-volatile memory resident on the unit microprocessor.
The microprocessor controls space temperature through using the
value provided by the temperature sensor within the indoor unit.
The microprocessor control will activate indoor unit operation when
the indoor room temperature falls below or rises above a setpoint
temperature, at which point, a signal is sent to the outdoor unit to
begin the appropriate mode. The microprocessor will also provide
self-diagnostics and auto restart functions. A field-supplied four-wire
power/communications cable must be installed to connect the indoor
unit(s) to the outdoor unit.
Controls
The indoor unit casing has a factory-standard, integral infrared
sensor designed to communicate with the supplied LG wireless
handheld remote controller. An optional LG supplied wired controller
is available as an additional accessory. Communication between the
indoor units and the outdoor unit is accomplished through 14 AWG,
four-core, stranded and shielded power/communication cable. The
indoor unit has built-in wi-fi and can be controlled with LG’s SmartThinQ app on a smart device. A field-supplied wi-fi network and
smart device are required. The SmartThinQ app is free and is available for Android and iOS smart devices.
Condensate
The unit is designed for gravity draining of condensate and includes
a flexible drain hose capable of installation in one of two directions.
Unit includes a connection that is compatible with the AquaGuard®
AG-9300-LG condensate sensor.
Due to our policy of continuous product innovation, some specications may change without notication.
Figure 1: Multi F Art Cool Mirror Wall-Mounted Indoor Unit.
• Built-in wi-fi
• Dehumidifying function
• Self diagnosis function
• Wireless LCD remote control included
Page 11
ART COOL MIRROR INDOOR UNITS
MULTI
F
MAX
MULTI
F
Table 3: Multi F Art Cool Mirror Indoor Unit General Data.
Model NameLAN090HSV5LAN120HSV5LAN180HSV5
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.
1
1
General Data / Specications
9,00012,00018,000
10,90013,600 21,600
57-77
59-81
Cross Flow
30 x 160.0 x 1
Motor/Drive
Airflow Rate CFM (H/M/L)
Unit Data
Refrigerant Type
2
Refrigerant Control
Power Supply V, Ø, Hz3
Rated Amps (A)
Sound Pressure Level 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.)
Brushless Digitally Controlled / Direct
268 / 218 / 169282 / 233 / 177558 / 438 / 353
R410A
EEV
208-230, 1, 60
0.4
36 / 32 / 2738 / 34 / 2944 / 38 / 34
32-15/16 x 12-1/8 x 7-9/1639-9/32 x 13-19/32 x 8-11/32
20.529.8
25.636.4
4 x 14
(2 x 23 x 22) x 1(2 x 16 x 20) x 1
1/4
3/81/2
1/43/8
3/85/8
27/32, 5/8
Art Cool Mirror™
1
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).
2
Nominal capacity is rated 0 ft. above sea level with corresponding refrigerant piping length in
This unit comes with a dry helium charge.
Due to our policy of continuous product innovation, some specications may change without notication.
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.
5
All power wiring / communications cable to the IDUs be minimum 14 AWG, 4-conductor, stranded,
shielded or unshielded (if shielded, must be grounded to chassis at ODU only) and must comply with
applicable local and national codes.
ART COOL M IRROR | 11
Page 12
ART COOL MIRROR INDOOR UNITS
MULTI
F
MAX
MULTI
F
Dimensions
Figure 2: LAN090HSV5 and LAN120HSV5 Dimensions.
Refrigerant, Drain
Pipe, and Cable
Knock Out Hole
1/8 (3) x 1/4 (6)
1/4 (6) x 1/8 (3)
1-1/4 (31)
2-7/16 (61.5)
5-31/32 (152)
1-3/32 (50.2)
1-1/16 (26.2)
2-7/32 (56)
2 (51)
Unit : inch (mm)
1-7/16 (33.5)
Terminal Block for
Power Supply and
Communication
Approx. 11-11/32 (288) to gas pipe
85°
45°
15°
15°
5/8 (15.3)
55°
55°
1-9/32 (32.7)
(61)
2-13/32
* If airflow direction control is available,
CoolingHeating
1-27/32(47)
1-1/2 (38)
Up & DownLeft & Right
Connection
Decoration Cover
3-5/8 (92)
2-3/8 (60)
2-5/16
(59)
Refrigerant, Drain
Pipe and Cable
Knock Out Hole
Approx. 8-19/32 (218) to liquid pipe
Drain Hose
Multi F and Multi F MAX Indoor Unit Engineering Manual
Connecting Gas/Liquid Pipe
Unit Outline
32-15/16 (837)
Air Outlet Hole
Air Outlet Hole
[28-5/32 (715)]
Bottom
Air Outlet
2 (51)
5/16 (8)
11/32 (9)
2-7/32(56)
Left Rear piping
C Type
2-7/32 (56)
12-1/8 (308)
Installation Plate
Display & Remote
Controller Signal
Receiver Signal
Refrigerant,
Drain Pipe
and Cable
Knock
Out Hole
Ø2-9/16"
[5-29/32 (150)]
Air Intake Hole
Left
Rear
32-15/16 (837)
Air Intake
7-9/16 (192)
Unit Outline
C Type : 16.5C Type : 16.5
Attaching the Installation Plate, Drilling Hole
Place a Level on Raised Tab
Right
Air Intake Hole
[30-3/16 (767)]
Rear
12 | ART COO L MIRROR
C Type : 5.3C Type : 3.9
In Case of Left Side Piping
5-3/16 (132)
12-1/8 (308)
Due to our policy of continuous product innovation, some specications may change without notication.
Due to our policy of continuous product innovation, some specications may change without notication.
Measuring Tape
3.3
Ø2-9/16"
Right Rear piping
Place a Level on Raised Tab
ART COOL M IRROR | 13
Page 14
ART COOL MIRROR INDOOR UNITS
MULTI
F
MAX
MULTI
F
Cooling Capacity Table
Table 4: Multi F Art Cool Mirror Indoor Units Cooling Capacity Table.
Model No. /
Nominal Capacity
of Indoor Unit
(Btu/h)
LAN090HSV5
9,000
LAN120HSV5
12,000
Multi F and Multi F MAX Indoor Unit Engineering Manual
TC = Total Capacity (kBtu/h).
SHC: Sensible Heat Capacity (kBtu/h).
Nominal capacity as rated 0 ft. above sea level and a 0 ft. level difference between outdoor and indoor units. Corresponding refrigerant piping length is accordance with standard length of each outdoor unit.
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).
The shaded table columns and rows indicate reference data. When operating at this temperature, these values can be different if the system is not running consistently.
Table 5: Multi F Art Cool Mirror Indoor Units Cooling Capacity Table (continued).
Model No. /
Nominal Capacity
of Indoor Unit
(Btu/h)
LAN180HSV5
18,000
TC = Total Capacity (kBtu/h).
SHC: Sensible Heat Capacity (kBtu/h).
Nominal capacity as rated 0 ft. above sea level and a 0 ft. level difference between outdoor and indoor units. Corresponding refrigerant piping length is accordance with standard length of each outdoor unit.
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).
The shaded table columns and rows indicate reference data. When operating at this temperature, these values can be different if the system is not running consistently.
Table 6: Multi F Art Cool Mirror Indoor Units Heating Capacity Table.
Model No. /
Nominal Capacity of
Indoor Unit
(Btu/h)
LAN090HSV5
10,900
LAN120HSV5
13,600
LAN180HSV5
21,600
Multi F and Multi F MAX Indoor Unit Engineering Manual
TC = Total Capacity (kBtu/h).
Nominal capacity as rated 0 ft. above sea level and a 0 ft. level difference between outdoor and indoor units. Corresponding refrigerant piping length is accordance with standard length of each outdoor unit.
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).
• Measurement taken 2.6′ below the bottom of the unit and at a
distance of 3.3′ from face of unit.
• Measurements taken with no attenuation and units operating at full
load normal operating condition.
• Sound level will vary depending on a range of factors such as
construction (acoustic absorption coefficient) of particular area in
which the equipment is installed.
• Sound power levels are measured in dB(A).
• Tested in anechoic chamber per ISO Standard 3745.
Table 7:Sound Pressure Levels (dB[A]).
Sound Pressure Levels (dB[A]) (Cooling and Heating)
Model No.
LAN090HSV5363227
LAN120HSV5383429
LAN180HSV5443834
High Fan Speed
Medium Fan
Speed
Low Fan Speed
Art Cool Mirror™
Figure 5: Sound Pressure Level Diagrams.
LAN090HSV5LAN120HSV5
LAN180HSV5
Due to our policy of continuous product innovation, some specications may change without notication.
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:
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.
Two (2)
One (1)
Required Tools
• Level
• Screwdriver
• Electric drill
• Hole core drill
• Flaring tool set
• Spanner (Half union)
• Thermometer
Art Cool Mirror™
Due to our policy of continuous product innovation, some specications may change without notication.
To avoid the possibility of re, do not install the unit in an area where combustible gas will generate, ow, stagnate, or leak. Failure to do so will
cause serious bodily injury or death. Before beginning installation, read the safety summary at the beginning of this manual.
Select a location for installing the wall-mounted indoor unit (IDU) that meets the following conditions:
• Where there is enough structural strength to bear the weight of the unit
• Where air circulation will not be blocked
• Where noise prevention is taken into consideration
• Ensure there is sufficient space from the ceiling and floor
• Locate the indoor unit in a location where it can be easily connected to the outdoor unit/branch distribution unit
• Include space for drainage to ensure condensate flows properly out of the unit when it is in cooling mode
• Use a level indicator to ensure the unit is installed on a level plane
Note:
The unit will be damaged, will malfunction, and/or will not operate as designed if installed in any of the following conditions:
Do not install the unit where it will be subjected to direct thermal radiation from other heat sources.
Do not install the unit in an area where combustible gas will generate, flow, stagnate, or leak.
Do not install the unit in a location where acidic solution and spray (sulfur) are often used.
Do not use the unit in environments where oil, steam, or sulfuric gas are present.
Do not install additional ventilation products on the chassis of the unit.
Do not install the unit near high-frequency generator sources.
Do not install the unit near a doorway.
• Indoor units (IDUs) must not be placed in an environment where the IDUs will be exposed to harmful volatile organic compounds (VOCs)
or in environments where there is improper air make up or supply or inadequate ventilation. If there are concerns about VOCs in the environment where the IDUs are installed, proper air make up or supply and/or adequate ventilation must be provided. Additionally, in buildings
where IDUs will be exposed to VOCs, consider a third party factory-applied epoxy coating to the fan coils for each IDU where the entire coil
is dipped, not sprayed.
• If the unit is installed near a body of water, the installation parts are at risk of corroding. Appropriate anti-corrosion methods must be taken
for the unit and all installation parts.
Installing in an Area Exposed to Unconditioned Air
In some installation applications, areas (floors, walls) in some rooms
will be exposed to unconditioned air (room will be above or next to
an unheated garage or storeroom). To countermeasure:
Multi F and Multi F MAX Indoor Unit Engineering Manual
• Verify that carpet is or will be installed (carpet will increase the
temperature by three degrees).
• Add insulation between the floor joists.
• Install radiant heat or another type of heating system to the floor.
Required Clearances
Figure 10 shows required clearance distances around a typical
installed wall-mounted unit.
Mounting the Installation Plate
The mounting wall must be strong and solid enough to protect the unit from vibration.
• Mount the installation plate on the wall using the Type “A” screws. If mounting the unit on concrete, consider using anchor bolts.
• Always mount the installation plate horizontally. Measure the wall and mark the centerline using thread and a level.
22 | ART CO OL MIRROR
Due to our policy of continuous product innovation, some specications may change without notication.
Figure 11:Installation Plate for LAN090HSV5 and LAN120HSV5 Units.Figure 12:Installation Plate for LAN180HSV5 Units.
Place a level on raised tab
Unit Outline
18-1/8 inches22-7/16 inches
Ø2-3/4 inches
Left rear piping
5-1/4 inches
6-7/8 inches
Installation Plate
3-3/4 inches
Ø2-3/4
inches
8-17/32 inches
Right rear piping
Left rear
piping
2-23/32 inches
4-1/8 inches
Drilling Piping Hole in the Wall
Use caution when drilling holes through walls. Drilling into power wiring in the wall can cause serious
bodily injury or death.
Follow the left or right piping clearance recommendations.
1. Using a 2-5/8 (ø 65mm) inch hole core drill bit, drill a hole at either the right or left side of the
wall mounting. The hole must slant 3/16” to 5/16” from level (upward on the indoor unit side and
downward on the outdoor unit side).
2. Finish off the newly drilled hole as shown with bushing and sleeve covering. Sleeve and bushing prevents damage to the tubing/bundling of the piping.
Hanging the Indoor Unit Chassis
1. Attach the three (3) hooks on the top of the indoor unit to the top edge of
the installation plate. Verify the hooks are properly attached to the installation plate by gently shaking the indoor unit from side to side.
2. Unlock the tubing clamp from the indoor unit frame. For easier access between the bottom of the indoor unit and the wall, prop the clamp between
the indoor unit frame and installation plate.
3. Remove the screw covers at the bottom of the indoor unit, unscrew the
two (2) screws, remove the frame cover, remove the piping connection
cover, and position the piping for installation (down, back, left, or right).
Figure 14:Accessing the Back of the Indoor Unit.
Figure 15:Removing the Frame Cover.
Figure 13:Locking the Indoor Unit onto the Installation Plate.
Installation Plate
Measuring Tape
Measuring Tape Hanger
Figure 19:Drilling Piping Hole
Ø2-3/4 inches
Right rear
piping
2-7/32 inches
8-5/32 inches
Art Cool Mirror™
Tubing Clamp
Figure 16:Exterior Back View of Indoor Unit.Figure 17:Piping Installed to the Left.
Tape
Connecting
pipe
Drain hose
Due to our policy of continuous product innovation, some specications may change without notication.
• Follow manufacturer’s circuit diagrams in the technical manuals.
• Confirm power source specifications.
• Confirm that the electrical capacity is sufficient.
• Starting current must be maintained ±10 percent of the rated current marked on the outdoor unit name plate.
• Confirm cable thickness specifications.
• It is required that a circuit breaker is installed, especially if conditions could become wet or moist.
• Include a disconnect in the power wiring system, add an air gap contact separation of at least 1/8 inch in each active (phase) conductor.
• Loose wiring will cause unit to malfunction, overheat, and catch fire, resulting in severe injury or death.
Note:
• Terminal screws will become loose during transport. Properly tighten the terminal connections during installation.
A voltage drop will cause the following problems:
• Magnetic switch vibration, fuse breaks, or disturbance to the normal function of an overload protection device.
• Compressor will not receive the proper starting current.
Connecting the Power Wiring and Communications Cable
1. Insert the power wiring/communications cable from the outdoor
unit or branch distribution unit (Multi F MAX systems only)
through the bottom of the indoor unit.
2. Connect each wire to its appropriate terminal on the indoor unit
control board. Verify that the color and terminal numbers from
the outdoor unit or branch distribution unit (Multi F MAX systems
only) wiring match the color and terminal numbers on the indoor
unit.
3. Secure the power wiring/communications cable with the cable
restraint.
Figure 21:Simplied View of Indoor Unit to Outdoor Unit / Branch
Distribution Unit Terminal Connections—LAN090HSV5 and
LAN120HSV5 models.
GND
Indoor Unit Terminal Block
Multi F and Multi F MAX Indoor Unit Engineering Manual
BR
GRN / YLW
32(L2)1(L1)
BL
RD
Outdoor Unit Terminal Block or
Branch Distribution Unit Terminal Block
(Multi F MAX Systems Only)
3 or S
GND
Figure 20:Connecting the Power Wiring / Communications Cable.
Figure 22:Simplied View of Indoor Unit to Outdoor Unit / Branch
Distribution Unit Terminal Connections—LAN180HSV5 models.
24 | ART COOL MIRROR
GND
GRN / YLW
Indoor Unit Terminal Block
1(L1 )2(L2)
BR
BL
Outdoor Unit Terminal Block or
Branch Distribution Unit Terminal Block
(Multi F MAX Systems Only)
3
RD
Due to our policy of continuous product innovation, some specications may change without notication.
Figure 24:Wired Controller Connection on the Indoor Unit Terminal
Block—LAN090HSV5 and LAN120HSV5 models.
Figure 25:Wired Controller Connection on the Indoor Unit Terminal
Block—LAN180HSV5 models.
Wired Controller Placement
Wired controllers include a sensor to detect room temperature. To maintain comfort
levels in the conditioned space, the wired controller must be installed in a location
away from direct sunlight, high humidity, and where it could be directly exposed to
cold air. Controller must be installed four (4) to five (5) feet above the floor where its
LED display can be read easily, in an area with good air circulation, and where it can
detect an average room temperature.
Do not install the wired controller near or in:
• Drafts or dead spots behind doors and in corners
• Hot or cold air from ducts
• Radiant heat from the sun or appliances
• Concealed pipes and chimneys
• An area where temperatures are uncontrolled, such as an outside wall
Figure 26:Proper Location for the Wired Controller.
Multi F and Multi F MAX Indoor Unit Engineering Manual
Operation Mode Sequence
Cooling Mode
↓
Auto Operation
↓
Dehumidification Mode
26 | ART COOL MIRR OR
↓
Heating Mode
Due to our policy of continuous product innovation, some specications may change without notication.
1. The controller wiring/cable can be installed in one of three direc-
tions: top, back, or on the right side. If top or right side installation
is desired, remove cable guide grooves on the controller, and
then position wiring/cable on applicable side.
2. Choose and mark the area of installation, and then screw the wall
plate into place (using the provided parts). Install the controller
wall plate to fit the electrical box if one is present. Ensure that no
gaps exist between the wall plate and the wall itself.
3. Arrange wiring/cables so as not to interfere with the controller
circuitry. Position the wired controller on the wall plate. Snap into
place by pressing the bottom part of the wired controller onto
the wall plate. Make sure that no gaps exist between the wired
controller and the wall plate on all sides.
4. To remove wired controller from the wall plate, insert a screwdriver into the two holes at the bottom. Twist screwdriver to
release controller. Do not damage the controller components
when removing.
Figure 27:Removing the Cable Guide Grooves.
Top
Back
Figure 28:Attaching the Wall Plate.Figure 29:Installing/Removing the
Right
Side
Controller.
Right
Side
Art Cool Mirror™
Assigning the Thermistor for Temperature Detection
Each indoor unit includes a return air thermistor assigned to sense the temperature. If a wired controller is installed, there is a choice of
sensing temperature with either the indoor unit return air thermistor or the thermistor in the wired controller. It is also an option to set both
thermistors to sense temperature so that indoor unit bases its operation on the first thermistor to reach the designated temperature differential. For applicable indoor units, an optional Remote Temperature Sensor can be used in lieu of the return air thermistor—either alone or in
conjunction with a wired controller thermistor as previously described.
Due to our policy of continuous product innovation, some specications may change without notication.
“Air Velocity and Temperature Distribution” on page 35
“Refrigerant Flow Diagram” on page 36
“Wiring Diagram” on page 37
“Factory Supplied Parts and Materials” on page 38
“Installation and Best Layout Practices” on page 39
Page 29
ART COOL GALLERY INDOOR UNITS
MULTI
F
MAX
MULTI
F
Mechanical Specications and Features
ART COOL Gallery Indoor Units
General
All LG indoor units are factory assembled, wired, piped, and provided with a control circuit board, fan, and motor. Art Cool Gallery
indoor units have a sound rating no higher than 42 dB(A) as tested
per KSA0701 ISO Standard 3745.
Coil
Indoor unit coils are comprised of a minimum of two rows of
aluminum fins mechanically bonded to copper tubing. The coils are
pressure tested at the factory. Each unit is provided with a factory
installed condensate drain pan below the coil.
Refrigerant System
System is designed for use with R410A refrigerant. The refrigeration
circuit is pressure-tested at the factory and shipped with a holding
charge of helium gas. Refrigerant pipe connections are 45° flare.
All refrigerant lines from the outdoor unit to the indoor units must be
field insulated.
Electrical
Each indoor unit is designed to operate using 208–230/60/1 power
with voltage variances of ±10%.
Casing
Units are designed to mount on a vertical surface, and are shipped
with a separate back plate that secures the unit to the wall, protruding no more than six (6) inches. Unit is designed so that refrigerant
piping can be installed in one of four different directions.
Cases / Finishes
The Art Cool Gallery unit has a frame that can accommodate a 20" x
20" photograph, picture or artwork. Unit casing has a gray finish and
is manufactured of heavy-duty acrylonitrile butadiene styrene (ABS)
and high impact polystyrene (HIPS) plastic.
Fan Assembly and Control
The unit has a single, direct-drive, crossflow fan made of high
strength ABS plastic. The fan motor is brushless digitally controlled
(BLDC) with permanently lubricated and sealed ball bearings. The
fan/motor assembly is mounted on vibration attenuating rubber
grommets. Fan speed is controlled using a microprocessor-based
direct digitally controlled algorithm that provides pre-programmed,
field-selectable fixed or auto fan speeds in the Heating and Cooling
modes. For Art Cool Gallery units, the indoor fan has Low, Med,
High, Power Cool and Auto settings for Cooling mode; and has Low,
Med, High, and Auto settings for Heating mode. The Auto setting
adjusts the fan speed based on the difference between the controller
setpoint and space temperature. Also, the separate Chaos setting
provides a simultaneous and random change in fan speed and flow
direction at the discharge,
simulating a natural outdoor
breeze.
Figure 30: Multi F Art Cool Gallery
Indoor Unit.
Air Filter
Return air is filtered with a
factory-supplied, removable,
washable pre-filter. Filter
access is from the front of
the unit without the use of
tools.
Airflow Guide Vanes
Motorized oscillating guide
vanes are factory installed,
and allows the ability to
control the direction of
airflow from side to side. A
motorized air sweep louver provides an automatic change in airflow
by directing the air up and down to provide uniform air distribution.
Microprocessor Control
The indoor unit is provided with an integrated control panel to
communicate with the outdoor unit. All unit operation parameters are
stored in non-volatile memory resident on the unit microprocessor.
The microprocessor controls space temperature through using the
value provided by the temperature sensor within the indoor unit.
The microprocessor control will activate indoor unit operation when
the indoor room temperature falls below or rises above a setpoint
temperature, at which point, a signal is sent to the outdoor unit to
begin the appropriate mode. The microprocessor will also provide
self-diagnostics and auto restart functions. A field-supplied fourwire power / communications cable must be installed to connect the
indoor unit(s) to the outdoor unit.
Controls
The indoor unit casing has a factory-standard, integral infrared
sensor designed to communicate with the supplied LG wireless
handheld remote controller. An optional LG supplied wired controller
is available as an additional accessory. Communication between the
indoor units and the outdoor unit is accomplished through 14 AWG,
four-core, stranded and shielded power / communication cable.
Condensate
The unit is designed for gravity draining of condensate and includes
a flexible drain hose capable of installation in one of two directions.
Unit includes a connection that is compatible with the AquaGuard®
AG-9300-LG condensate sensor.
Art Cool Gallery™
Features
• Inverter (Variable speed fan)
• Chaos swing
• Jet cool
• Group control
• Self-cleaning indoor coil
• Auto operation / auto restart operation
Due to our policy of continuous product innovation, some specications may change without notication.
Table 13: Multi F Art Cool Gallery Indoor Unit General Data.
Model NameLMAN097HVPLMAN127HVP
Nominal Cooling Capacity (Btu/h)
Nominal Heating Capacity (Btu/h)
1
1
Operating Range
Cooling (°F WB)
Heating (°F DB)
Fan
Type
Motor Output (W) x Qty.
Motor/Drive
Brushless Digitally Controlled / DirectBrushless Digitally Controlled / Direct
Airflow Rate CFM (H/M/L)
Unit Data
Refrigerant Type
2
Refrigerant Control
Power Supply V, Ø, Hz3
Rated Amps (A)
Sound Pressure Level dB(A) (H/M/L)4
Dimensions (W x H x D, in.)
23-5/8 x 23-5/8 x 5-25/3223-5/8 x 23-5/8 x 5-25/32
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
Piping
Liquid (in.)
Vapor (in.)
Drain O.D. / I.D. (in.)
1
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
Multi F and Multi F MAX Indoor Unit Engineering Manual
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).
2
This unit comes with a dry helium charge.
9,00011,200
10,40013,300
57-7757-77
59-8159-81
TurboTurbo
24 x 124 x 1
272 / 208 / 155314 / 258 / 198
R410AR410A
EEVEEV
208-230, 1, 60 208-230, 1, 60
0.20.2
39 / 35 / 3142 / 38 / 34
3232
3737
4 x 144 x 14
(2 x 20 x 21) x 1(2 x 20 x 21) x 1
1/41/4
3/83/8
27/32, 5/827/32, 5/8
3
Acceptable operating voltage: 187V-253V.
4
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.
5
All power wiring / communications cable to the IDUs be minimum 14 AWG, 4-conductor, stranded,
shielded or unshielded (if shielded, must be grounded to chassis at ODU only) and must comply with
applicable local and national codes.
30 | ART CO OL GALLERY™
Due to our policy of continuous product innovation, some specications may change without notication.
Table 14: Multi F Art Cool Gallery Indoor Units Cooling Capacity Table.
Model No. /
Nominal Capacity
of Indoor Unit
(Btu/h)
LMAN097HVP
9,000
LMAN127HVP
12,000
Multi F and Multi F MAX Indoor Unit Engineering Manual
TC = Total Capacity (kBtu/h).
SHC: Sensible Heat Capacity (kBtu/h).
Nominal capacity as rated 0 ft. above sea level and a 0 ft. level difference between outdoor and indoor units. Corresponding refrigerant piping length is accordance with standard length of each outdoor unit.
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).
The shaded table columns and rows indicate reference data. When operating at this temperature, these values can be different if the system is not running consistently.
Table 15: Multi F Art Cool Gallery Indoor Units Heating Capacity Table.
Model No. /
Nominal Capacity
of Indoor Unit
(Btu/h)
LMAN097HVP
9,000
LMAN127HVP
12,000
TC = Total Capacity (kBtu/h).
Nominal capacity as rated 0 ft. above sea level and a 0 ft. level difference between outdoor and indoor units. Corresponding refrigerant piping length is accordance with standard length of each outdoor unit.
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).
Outdoor Air Temp.Indoor Air Temp. °F DB
°F DB°F WB
0-0.45.355.285.235.205.124.90
54.56.035.955.905.885.805.58
1096.716.636.586.566.486.26
17157.617.547.497.467.397.14
20197.957.887.837.807.727.46
25238.528.448.398.378.297.99
30289.018.938.888.868.788.52
35329.509.429.379.349.279.04
40369.949.869.819.789.719.48
454110.3710.3010.2510.2210.159.92
474310.5510.4810.4310.4010.3210.10
504610.7210.6410.5910.5710.4910.24
555111.0010.9310.8810.8510.7810.48
605611.0010.9310.8810.8510.7810.52
635911.0010.9310.8810.8510.7810.55
686411.0010.9310.8810.8510.7810.60
0-0.46.846.756.686.656.556.26
54.57.717.617.557.527.427.13
1098.588.488.428.388.298.00
17159.739.649.579.549.449.14
201910.1710.0710.019.989.889.54
252310.8910.7910.7310.7010.6010.22
302811.5211.4211.3611.3211.2310.89
353212.1412.0511.9811.9511.8511.57
403612.7112.6112.5512.5112.4212.13
454113.2713.1713.1113.0812.9812.69
474313.4913.4013.3313.3013.2012.91
504613.7113.6113.5513.5213.4213.10
555114.0713.9713.9113.8813.7813.40
605614.0713.9713.9113.8813.7813.46
635914.0713.9713.9113.8813.7813.49
686414.0713.9713.9113.8813.7813.55
616468707275
TCTCTCTCTCTC
Art Cool Gallery™
Due to our policy of continuous product innovation, some specications may change without notication.
• Measurement taken 2.6′ below the bottom of the unit and at a
distance of 3.3′ from face of unit.
• Measurements taken with no attenuation and units operating at full
load normal operating condition.
• Sound level will vary depending on a range of factors such as
construction (acoustic absorption coefficient) of particular area in
which the equipment is installed.
• Sound power levels are measured in dB(A).
• Tested in anechoic chamber per ISO Standard 3745.
Table 16: Sound Pressure Levels (dB[A]).
Sound Pressure Levels (dB[A]) (Cooling and Heating)
Model No.
High Fan Speed
Medium Fan
Speed
Low Fan Speed
LMAN097HVP393531
LMAN127HVP423834
Multi F and Multi F MAX Indoor Unit Engineering Manual
Installation work must be performed by trained personnel and in accordance with national wiring standards and all local or other applicable codes.
Multi F and Multi F MAX Indoor Unit Engineering Manual
Improper installation can result in re, electric shock, physical injury, or death.
Note:
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.
38 | ART CO OL GALL ERY™
Due to our policy of continuous product innovation, some specications may change without notication.
• Place the unit where air circulation will not be blocked.
• Place the unit where drainage can be obtained easily.
• Place the unit where noise prevention is taken into consideration.
• Ensure there is sufficient space from the ceiling and floor.
• Ensure there is sufficient maintenance space.
• Locate the indoor unit in a location where it can be easily connected to the outdoor
unit/branch distribution unit.
Don’ts
• Do not install the unit near a heat or steam source, or where considerable amounts of oil, iron powder, or flour are used.
• Do not install the unit where sulfuric acid and flammable or corrosive gases are generated, vented into, or stored.
• Do not install the unit near high-frequency generators.
• Do not install the unit near a doorway.
The unit will be damaged, will malfunction, and/ or will not operate as designed if installed in any of the conditions listed.
• Indoor units (IDUs) must not be placed in an environment where the IDUs will be exposed to
harmful volatile organic compounds (VOCs) or in environments where there is improper air make
up or supply or inadequate ventilation. If there are concerns about VOCs in the environment where
the IDUs are installed, proper air make up or supply and/or adequate ventilation must be provided.
Additionally, in buildings where IDUs will be exposed to VOCs, consider a third party factory-applied
epoxy coating to the fan coils for each IDU where the entire coil is dipped, not sprayed.
• If the unit is installed near a body of water, the installation parts are at risk of corroding. Appropriate
anti-corrosion methods must be taken for the unit and all installation parts.
Figure 38:Minimum Clearance Requirements.
Figure 39:Using the Installation Guide.
Art Cool Gallery™
Installing in an Area Exposed to Unconditioned Air
In some installation applications, areas (oors, walls) in some rooms will be exposed to unconditioned
air (room will be above or next to an unheated garage or storeroom). To countermeasure:
• Verify that carpet is or will be installed (carpet will increase the temperature by three degrees).
• Add insulation between the floor joists.
• Install radiant heat or another type of heating system to the floor.
Using the Installation Guide
1. Choose an appropriate location for the indoor unit. To hang the installation guide, verify that it is
level and plumb, and then tape it to the wall.
2. Drill four (4) 1/4-inch diameter holes with a depth of 1-3/16 to 1-3/8 inches for the mounting
screws. Drill one (1) two (2) inch-diameter hole for the field-installed refrigerant and drain piping.
3. Insert a plastic anchor into each of the mounting holes.
4. Screw the top two (2) screws into the wall. Do not flush them to the wall; leave a 7/16 inch
space for hanging the indoor unit.
Note:
If the unit is installed near a body of water, certain components are at risk of being corroded.
Appropriate anti-corrosion methods must be taken for the unit and all components.
Due to our policy of continuous product innovation, some specications may change without notication.
1. First pull the top of the front panel up (1A) and then out (1B).
2. Remove the two (2) screws at the bottom (2A), then lift off the front
panel (2B).
3. To completely detach the front panel, disconnect the panel connector
found at the top of the indoor unit (3).
Removing the Piping and Side Covers
1. Unscrew the center cover.
Figure 40:Preparing for Installation.
Figure 41:Removing the Piping and Side Covers.
2. Remove the cover from the side of the indoor unit chosen for the piping connections,
and then knock out the piping access hole. If the refrigerant piping will be connected
through the back of the unit, the access hole does not need to be knocked out.
3. Remove any burrs that will have been made.
Preparing the Drain Hose
1. Remove the rubber stopper from the chosen side of the indoor unit.
Multi F and Multi F MAX Indoor Unit Engineering Manual
2. Insert the drain hose into the handle of the drain pan.
3. Connect the drain hose to the field-installed drain piping.
40 | ART COOL GALLERY™
Due to our policy of continuous product innovation, some specications may change without notication.
Preparing the Refrigerant and Drain Piping Connections
1. Depending on the installation requirements, route the indoor unit refrigerant piping and the
drain hose to the left, right (see guidelines below), or rear of the frame.
2. Bundle the piping and drain hose with tape where they meet near the indoor unit frame. Po-
sition the drain hose at the bottom of the bundle (positioning the drain hose at the top of the
bundle will cause the drain pan to overflow inside the indoor unit).
Installing Piping on the Right Side of the Indoor Unit Frame
1. Press on the top of the clamp, and then
slowly guide the piping downward.
2. Bend the piping to the right side of the
indoor unit frame.
Do not bend the piping/drain hose from side to side; it will damage the components.
Figure 44:Right Side Piping Access.
Figure 43:Preparing the Refrigerant /
Drain Connections.
Art Cool Gallery™
Hanging the Indoor Unit Frame
1. Remove the installation guide and hang the indoor unit on the top two (2) screws. Verify
the indoor unit is hanging securely on the screws.
2. Align the holes at the bottom of the indoor unit to the mounting holes. Tighten first the top
screws, then tighten the bottom screws.
3. Verify that the indoor unit is completely secured to the wall by gently shaking it up and
down.
Figure 45:Hanging the Indoor Unit Frame.
1
Holes for Hanging
(On back of
indoor unit)
2
3
Due to our policy of continuous product innovation, some specications may change without notication.
Connecting the Indoor Unit Piping to the Field-Installed Piping
1. Center align the indoor unit piping (refrigerant and drain) and the field-installed
piping, then hand tighten the flare nut.
2. Tighten the flare nut with a torque wrench.
3. Attach the drain tube piping to the indoor unit drain hose as shown below.
Figure 47:Extending the Drain Hose.
If the drain hose is routed inside a room, add insulation
to prevent condensation from
forming.
Insulating the Refrigerant and Drain Piping
Figure 46:Indoor Unit to Field-Installed Piping Connection.
Figure 48:Insulating the Piping.
Ensure all piping is insulated. Exposed piping can cause burns if touched.
Refrigerant Piping Insulation
Field-installed vapor and liquid refrigerant piping lines must be properly and completely
covered in insulation (up to the indoor unit piping connections). Any exposed piping will
generate condensate or will cause burns if touched. Insulation for this field-installed refrigerant piping must have a minimum heat resistance of 248°F.
Drain Piping Insulation
Drain piping must have insulation a minimum of 7/32 inches thick.
Installing the Insulation
1. Overlap the insulation at the connection of the field-installed piping and the indoor unit
piping. Tape together so there are no gaps.
2. Secure insulation to the rear piping housing section with vinyl tape.
3. Bundle the piping and drain hose with tape where they meet at the back of the indoor
unit frame. Position the drain hose at the bottom of the bundle (positioning the drain
hose at the top of the bundle will cause the drain pan to overflow inside the indoor
Multi F and Multi F MAX Indoor Unit Engineering Manual
unit).
Drain Slope
Drain hose must point
down so water can flow
away easily.
Figure 49:Drain Piping Slope.
42 | ART C OOL GAL LERY™
Checking the Drainage System
1. Pour water on the indoor unit evaporator.
2. Ensure the water
flows through and out
of the hose and away
from the indoor unit
without leaking.
Due to our policy of continuous product innovation, some specications may change without notication.
Figure 50:Checking the Drainage
System.
Page 43
ART COOL GALLERY INDOOR UNITS
MULTI
F
MAX
MULTI
F
Installation and Best Layout Practices
Power Wiring / Communications Cable Guidelines
• Follow manufacturer’s circuit diagrams in the technical manuals.
• Confirm power source specifications.
• Confirm that the electrical capacity is sufficient.
• Starting current must be maintained ±10 percent of the rated current marked on the outdoor unit name plate.
• Confirm cable thickness specifications.
• It is required that a circuit breaker is installed, especially if conditions could become wet or moist.
• Include a disconnect in the power wiring system, add an air gap contact separation of at least 1/8 inch in each active (phase) conductor.
• Loose wiring will cause unit to malfunction, overheat, and catch fire, resulting in severe injury or death.
Note:
• Terminal screws will become loose during transport. Properly tighten the terminal connections during installation.
A voltage drop will cause the following problems:
• Magnetic switch vibration, fuse breaks, or disturbance to the normal function of an overload protection device.
• Compressor will not receive the proper starting current.
Art Cool Gallery™
Connecting the Power Wiring and Communications Cable
1. Insert the power wiring/communications cable from the outdoor unit or branch distribution unit (Multi F MAX systems only)
through the access hole of the indoor unit (ground wire must be
longer than the other wires/cables). Unscrew the control board
cover.
2. Connect each wire to its appropriate terminal on the indoor unit
control board. Verify that the color and terminal numbers from
the outdoor unit or branch distribution unit (Multi F MAX systems
only) wiring match the color and terminal numbers on the indoor
unit.
3. Secure the power wiring/communications cable to the control
board.
4. Reattach the control board cover.
Figure 52:Simplied View of Indoor Unit to Outdoor Unit / Branch
Distribution Unit Terminal Connections—LMAN097HVP and
LMAN127HVP models.
Outdoor Unit Terminal Block or
GND
Indoor Unit Terminal Block
BR
GRN / YLW
32(L2)1(L1)
BL
RD
Branch Distribution Unit Terminal Block
(Multi F MAX Systems Only)
3 or S
GND
Figure 51:Connecting the Power Wiring / Communications Cable.
Control Board Cover
Lock nut
(field supplied)
Conduit
(field supplied)
1(L1)2(L2) 3
Due to our policy of continuous product innovation, some specications may change without notication.
Timer button: Sets the current time and the start/end times.
Navigation/Functions Button1: Adjusts the time and sets the special functions.
Auto clean / Operates energy saving cooling / Adjusts the brightness
of the indoor unit display
Set/Clear Button: Sets or cancels functions.
Reset Button: Resets the air conditioner settings.
Page 45
ART COOL GALLERY INDOOR UNITS
4 to 5 feet
above the floor
NO
NO
NO
YES
Remote Controller
TEMP
Remote Controller
TEMP
Re
m
ot
e
C
o
n
t
r
ol
l
er
TEMP
Top
WallWall
WallWall
Installing the Controller
Removing the Controller
Indoor Unit Terminal Block
GRN / YLW
(Multi F MAX Systems Only)
MULTI
F
MAX
MULTI
F
Wired Controller Connections
Figure 54:Wired Controller Connection on the Indoor Unit Terminal Block.
GND
Installation and Best Layout Practices
1(L1 )2(L2)
BR
BL
3
RD
To Outdoor Unit or Branch Distribution Unit
CN-REMO
To Wired Controller
Wired Controller Placement
Wired controllers include a sensor to detect room temperature. To maintain comfort
levels in the conditioned space, the wired controller must be installed in a location
away from direct sunlight, high humidity, and where it could be directly exposed to
cold air. Controller must be installed four (4) to five (5) feet above the floor where its
LED display can be read easily, in an area with good air circulation, and where it can
detect an average room temperature.
Do not install the wired controller near or in:
• Drafts or dead spots behind doors and in corners
• Hot or cold air from ducts
• Radiant heat from the sun or appliances
• Concealed pipes and chimneys
• An area where temperatures are uncontrolled, such as an outside wall
Hanging the Wired Controller
1. The controller wiring/cable can be installed in one of three direc-
tions: top, back, or on the right side. If top or right side installation
is desired, remove cable guide grooves on the controller, and
then position wiring/cable on applicable side.
2. Choose and mark the area of installation, and then screw the wall
plate into place (using the provided parts). Install the controller
wall plate to fit the electrical box if one is present. Ensure that no
gaps exist between the wall plate and the wall itself.
3. Arrange wiring/cables so as not to interfere with the controller
circuitry. Position the wired controller on the wall plate. Snap into
place by pressing the bottom part of the wired controller onto
the wall plate. Make sure that no gaps exist between the wired
controller and the wall plate on all sides.
4. To remove wired controller from the wall plate, insert a screwdriver into the two holes at the bottom. Twist screwdriver to
release controller. Do not damage the controller components
when removing.
Figure 55:Proper Location for the Wired Controller.
Figure 56:Removing the Cable Guide Grooves.
Top
Back
Figure 57:Attaching the Wall Plate.
Right
Side
Figure 58:Installing/Removing the
Controller.
Right
Side
Art Cool Gallery™
Due to our policy of continuous product innovation, some specications may change without notication.
Assigning the Thermistor for Temperature Detection
Each indoor unit includes a return air thermistor assigned to sense the temperature. If a wired controller is installed, there is a choice of
sensing temperature with either the indoor unit return air thermistor or the thermistor in the wired controller. It is also an option to set both
thermistors to sense temperature so that indoor unit bases its operation on the first thermistor to reach the designated temperature differential. For applicable indoor units, an optional Remote Temperature Sensor can be used in lieu of the return air thermistor—either alone or in
conjunction with a wired controller thermistor as previously described.
Finalizing Indoor Unit Installation
1. Verify that the side covers are closed or opened, depending on
installation requirements. Place the power wiring / communications cable in the bottom groove along the left side of the frame.
2. Reconnect the panel connector found at the top of the indoor unit.
3. Attach the top part of the front panel, then position its tabs in the
grooves on the bottom part of the indoor unit frame.
4. To ensure the front panel tabs are securely positioned in the
grooves, adjust the panel by loosening or tightening the screws
at the bottom.
Figure 59:Final Installation Step—Reattaching the Front Panel.
Front Panel
Connector
Multi F and Multi F MAX Indoor Unit Engineering Manual
46 | ART CO OL GALL ERY™
Due to our policy of continuous product innovation, some specications may change without notication.
“Air Velocity and Temperature Distribution” on page 60
“Refrigerant Flow Diagram” on page 62
“Wiring Diagram” on page 63
“Factory Supplied Parts and Materials” on page 65
“Installation and Best Layout Practices” on page 66
Page 49
MULTI
F
MAX
MULTI
F
STANDARD WALL-MOUNTED INDOOR UNITS
Mechanical Specications and Features
Standard Wall-Mounted Indoor Units
General
All LG indoor units are factory assembled, wired, piped, and pro-
vided with a control circuit board, fan, and motor. Standard Wall-
Mounted units have a sound rating no higher than 46 dB(A) as tested
per KSA0701 ISO Standard 3745.
Coil
Indoor unit coils are comprised of a minimum of two rows of
aluminum fins mechanically bonded to copper tubing. The coils are
pressure tested at the factory. Each unit is provided with a factory
installed condensate drain pan below the coil.
Refrigerant System
The system is designed for use with R410A refrigerant. The refrigeration circuit is pressure-tested at the factory and shipped with a
holding charge of helium gas. Refrigerant pipe connections are 45°
flare. All refrigerant lines from the outdoor unit to the indoor units
must be field insulated.
Electrical
The indoor units require 208–230Vac/60Hz/1Φ power with voltage
variance of no more than ±10%.
Casing
The units mount on a vertical surface. They are shipped with a separate back plate that secures the unit to the wall, protruding no more
than nine (9) inches. Refrigerant piping can be installed in one (1) of
four (4) different directions.
Finish
The Standard Wall-Mounted unit has a curved architectural panel
with a pearl white finish. Unit casing has a pearl white or dark gray
finish and is manufactured of heavy-duty acrylonitrile butadiene
styrene (ABS) and high impact polystyrene (HIPS) plastic.
Fan Assembly and Control
The unit has a single, direct-drive, crossow fan made of high strength
ABS plastic. The fan motor is brushless digitally controlled (BLDC)
with permanently lubricated and sealed ball bearings. The fan / motor
assembly is mounted on vibration attenuating rubber grommets. Fan
speed is controlled using a microprocessor-based direct digitally
controlled algorithm that provides pre-programmed, eld-selectable
xed or auto fan speeds in the Heating and Cooling modes. For
Standard Wall-Mounted units, the indoor fan has Low, Med, High, Jet
Cool, and Auto settings for Cooling mode; and has Low, Med, High,
Jet Heat, and Auto settings for Heating mode. The Auto setting adjusts
the fan speed based on the difference between the controller setpoint
and space temperature. Also, the separate Chaos setting provides a
simultaneous and random change in fan speed and ow direction at
the discharge, simulating a natural outdoor breeze.
Features
• Inverter (Variable speed fan)
• Comfort Air
• 3M filter
• Jet cool/Jet Heat
Figure 60: Multi F Standard Wall-Mounted Indoor Unit.
Air Filter
The return air inlet has a factory-supplied primary removable, washable filter. The unit is also equipped with a secondary 3M Micro Dust
filter. Filters are accessed from the front of the unit without the use
of tools.
Airflow Guide Vanes
A factory-installed motorized guide vane controls the direction of
airflow from side to side. A motorized louver provides an automatic
change in airflow by directing the air up and down for uniform air
distribution.
Microprocessor Control
The indoor unit has an integrated control panel to communicate with
the outdoor unit. All unit operation parameters are stored in non-volatile memory resident on the unit microprocessor. The microprocessor
controls space temperature through using the value provided by the
temperature sensor within the indoor unit. The microprocessor control
will activate indoor unit operation when the indoor room temperature
falls below or rises above a setpoint temperature, at which point, a
signal is sent to the outdoor unit to begin the appropriate mode. The
microprocessor also provides self-diagnostics and auto restart func-
tions. A eld-supplied four-wire power / communications cable must
be installed to connect the indoor unit(s) to the outdoor unit.
Controls
The indoor unit casing has a factory-standard, integral infrared sensor to communicate with the supplied LG wireless handheld remote
controller. An optional LG supplied wired controller is available as
an additional accessory. Communication between the indoor units
and the outdoor unit is accomplished through 14 AWG, four-core,
stranded and shielded power / communication cable. The indoor unit
has built-in wi-fi and can be controlled with LG’s SmartThinQ app on
a smart device. A field-supplied wi-fi network and smart device are
required. The SmartThinQ app is free and is available for Android
and iOS smart devices.
Condensate
The unit is designed for gravity draining of condensate and includes
a flexible drain hose capable of installation in one of two directions.
The unit also includes a connection that is compatible with the AquaGuard® AG-9300-LG condensate sensor.
• Group control
• Self-cleaning indoor coil
• Auto operation
• Auto restart operation
Due to our policy of continuous product innovation, some specications may change without notication.
Table 21: Multi F Standard Wall-Mounted Indoor Unit General Data.
Model NameLMN079HVTLSN090HSV5LSN120HSV5LMN159HVTLSN180HSV5LMN249HVT
Nominal Cooling Capacity (Btu/h)
Nominal Heating Capacity (Btu/h)
1
1
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
2
Refrigerant Control
Power Supply V, Ø, Hz3
Rated Amps (A)
Sound Pressure Level 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
Multi F and Multi F MAX Indoor Unit Engineering Manual
Liquid (in.)
Vapor (in.)
Drain O.D. / I.D. (in.)
1
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).
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.
5
All power wiring / communications cable to the IDUs be minimum 14 AWG, 4-conductor, stranded,
shielded or unshielded (if shielded, must be grounded to chassis at ODU only) and must comply with
applicable local and national codes.
39-9/32 x
13-19/32 x 8-9/32
50 | STD. WALL-MOUNTED
Due to our policy of continuous product innovation, some specications may change without notication.
Table 22: Multi F Standard Wall-Mounted Indoor Units Cooling Capacity Table.
Model No. /
Nominal Capacity
of Indoor Unit
(Btu/h)
LMN079HVT
7,000
LSN090HSV5
9,000
TC = Total Capacity (kBtu/h).
SHC: Sensible Heat Capacity (kBtu/h).
Nominal capacity as rated 0 ft. above sea level and a 0 ft. level difference between outdoor and indoor units. Corresponding refrigerant piping length is accordance with standard length of each outdoor unit.
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).
The shaded table columns and rows indicate reference data. When operating at this temperature, these values can be different if the system is not running consistently.
Table 23: Multi F Standard Wall-Mounted Indoor Units Cooling Capacity Table (continued).
Model No. /
Nominal Capacity
of Indoor Unit
(Btu/h)
LSN120HSV5
12,000
LMN159HVT
14,300
Multi F and Multi F MAX Indoor Unit Engineering Manual
TC = Total Capacity (kBtu/h).
SHC: Sensible Heat Capacity (kBtu/h).
Nominal capacity as rated 0 ft. above sea level and a 0 ft. level difference between outdoor and indoor units. Corresponding refrigerant piping length is accordance with standard length of each outdoor unit.
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).
The shaded table columns and rows indicate reference data. When operating at this temperature, these values can be different if the system is not running consistently.
Table 24: Multi F Standard Wall-Mounted Indoor Units Cooling Capacity Table (continued).
Model No. /
Nominal Capacity
of Indoor Unit
(Btu/h)
LSN180HSV5
18,000
LMN249HVT
24,000
TC = Total Capacity (kBtu/h).
SHC: Sensible Heat Capacity (kBtu/h).
Nominal capacity as rated 0 ft. above sea level and a 0 ft. level difference between outdoor and indoor units. Corresponding refrigerant piping length is accordance with standard length of each outdoor unit.
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).
The shaded table columns and rows indicate reference data. When operating at this temperature, these values can be different if the system is not running consistently.
Table 25: Multi F Standard Wall-Mounted Indoor Units Heating Capacity Table.
Model No. /
Nominal Capacity of
Indoor Unit (Btu/h)
LMN079HVT
8,100
LSN090HSV5
10,900
LSN120HSV5
13,600
Multi F and Multi F MAX Indoor Unit Engineering Manual
TC = Total Capacity (kBtu/h).
Nominal capacity as rated 0 ft. above sea level and a 0 ft. level difference between outdoor and indoor units. Corresponding refrigerant piping length is accordance with standard length of each outdoor unit.
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 26: Multi F Standard Wall-Mounted Indoor Units Heating Capacity Table.
Model No. /
Nominal Capacity of
Indoor Unit (Btu/h)
LMN159HVT
15,600
LSN180HSV5
21,600
LMN249HVT
25,600
TC = Total Capacity (kBtu/h).
Nominal capacity as rated 0 ft. above sea level and a 0 ft. level difference between outdoor and indoor units. Corresponding refrigerant piping length is accordance with standard length of each outdoor unit.
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).
• Measurement taken 2.6′ below the bottom of the unit and at a
distance of 3.3′ from face of unit.
• Measurements taken with no attenuation and units operating at full
load normal operating condition.
• Sound level will vary depending on a range of factors such as
construction (acoustic absorption coefficient) of particular area in
which the equipment is installed.
• Sound power levels are measured in dB(A).
• Tested in anechoic chamber per ISO Standard 3745.
Table 27: Sound Pressure Levels (dB[A]).
Sound Pressure Levels (dB[A]) (Cooling and Heating)
Model No.
LMN079HVT353126
LSN090HSV5363227
LSN120HSV5383429
LMN159HVT423832
LSN180HSV5443834
LMN249HVT464136
High Fan Speed
Medium Fan
Speed
Low Fan Speed
Figure 64:LMN079HVT, LSN090HSV5, and LSN120HSV5 Sound Pressure Level Diagrams.
LMN079HVT
LSN090HSV5
Multi F and Multi F MAX Indoor Unit Engineering 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:
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.
One (1)
Required Tools
• Level
• Screwdriver
• Electric drill
• Hole core drill
• Flaring tool set
• Spanner (Half union)
• Thermometer
Due to our policy of continuous product innovation, some specications may change without notication.
• Place the unit where air circulation will not be blocked.
• Place the unit where drainage can be obtained easily.
• Place the unit where noise prevention is taken into consideration.
• Ensure there is sufficient space from the ceiling and floor.
• Ensure there is sufficient maintenance space.
• Locate the indoor unit where it can be easily connected to the outdoor unit or branch
distribution unit.
Don’ts
• Do not install the unit near a heat or steam source, or where considerable amounts of oil,
iron powder, or flour are used.
• Do not install the unit where sulfuric acid and flammable or corrosive gases are generated, vented into, or stored.
• Do not install the unit near high-frequency generators.
• Do not install the unit near a doorway.
The unit will be damaged, will malfunction, and / or will not operate as designed if installed in any of the conditions listed.
• Indoor units (IDUs) must not be placed in an environment where the IDUs will be exposed to harmful volatile organic compounds (VOCs)
or in environments where there is improper air make up or supply or inadequate ventilation. If there are concerns about VOCs in the environment where the IDUs are installed, proper air make up or supply and/or adequate ventilation must be provided. Additionally, in buildings
where IDUs will be exposed to VOCs, consider a third party factory-applied epoxy coating to the fan coils for each IDU where the entire coil
is dipped, not sprayed.
• If the unit is installed near a body of water, the installation parts are at risk of corroding. Appropriate anti-corrosion methods must be taken for
the unit and all installation parts.
Installing in an Area Exposed to Unconditioned Air
In some installation applications, areas (floors, walls) in some rooms will be exposed to
unconditioned air (room will be above or next to an unheated garage or storeroom). To
countermeasure:
• Verify that carpet is or will be installed (carpet will increase the temperature by three degrees).
• Add insulation between the floor joists.
• Install radiant heat or another type of heating system to the floor.
Figure 73:Installation Plate—
Side View.
Mounting the Installation Plate
The mounting wall must be strong and solid enough to protect the unit from vibration.
• Mount the installation plate on the wall using the Type “A” screws. If mounting the unit on concrete, consider using anchor bolts.
• Always mount the installation plate horizontally. Measure the wall and mark the centerline using
thread and a level.
Figure 74:Installation Plate for LMN079HVT, LSN090HSV5,
LSN120HSV5, and LMN159HVT Units.
Multi F and Multi F MAX Indoor Unit Engineering Manual
Place a level on raised tab
17-3/817-3/8
5
Due to our policy of continuous product innovation, some specications may change without notication.
If the unit is installed near a body of water, certain components are at risk of being corroded. Appropriate anti-corrosion methods must be taken for the
unit and all components.
66 | STD. WALL-MOUNTED
Unit Outline
Ø2-9/16
6-7/8
5-3/163-11/16
Figure 75:Installation Plate for LSN180HSV5 and LMN249HVT Units.
Left rear
Right rear piping
piping
2-23/32 inches
Unit Outline
4-1/8 inches
18-1/8 inches22-7/16 inches
Installation Plate
Measuring Tape
Measuring Tape Hanger
Ø2-3/4 inches
Right rear
piping
2-7/32 inches
8-5/32 inches
Page 67
MULTI
F
MAX
MULTI
F
Installation plate
Tubing Clamp
Right
Tubing Clamp
Down
Left
Back
Frame Cover
STANDARD WALL-MOUNTED INDOOR UNITS
Installation and Best Layout Practices
Preparing for Installation
Prepare the refrigerant piping and drain hose (indoor unit piping) for installation through the
wall: press on the top of the tubing clamp and slowly guide the piping / hose down (depending
on installation requirements, then to the left or right). Relock the tubing clamp after the piping /
hose are released.
Note:
Do not bend the piping / drain hose from side to side; it will damage the components.
Hanging the Indoor Unit Frame
1. Attach the three (3) hooks on the top of the indoor unit to the top edge of the installation plate. Verify the hooks are properly attached to the installation plate by gently
shaking the indoor unit from side to side.
2. Unlock the tubing clamp from the indoor unit frame. For easier access between the
bottom of the indoor unit and the wall, prop the clamp between the indoor unit frame
and installation plate.
3. Remove the screw covers at the bottom of the indoor unit, unscrew the two (2) screws,
remove the frame cover, remove the piping connection cover, and position the piping
for installation (down, back, left, or right).
Figure 76:Preparing for Installation.
Standard Wall-Mounted
Figure 77:Locking the Indoor Unit onto the Installation Plate.
Figure 79:Removing the Frame Cover.
Figure 81:Piping Installed to the Left.
Figure 78:Accessing the Back of the Indoor Unit.
Figure 80:Exterior Back View of Indoor Unit.
Figure 82:Piping Installed to the Right.
Connecting
pipe
Tape
Drain hose
Due to our policy of continuous product innovation, some specications may change without notication.
• Follow manufacturer’s circuit diagrams in the technical manuals.
• Confirm power source specifications.
• Confirm that the electrical capacity is sufficient.
• Starting current must be maintained ±10 percent of the rated current marked on the outdoor unit name plate.
• Confirm cable thickness specifications.
• It is required that a circuit breaker is installed, especially if conditions could become wet or moist.
• Include a disconnect in the power wiring system, add an air gap contact separation of at least 1/8 inch in each active (phase) conductor.
• Loose wiring will cause unit to malfunction, overheat, and catch
fire, resulting in severe injury or death.
Figure 83: Connecting Power Wiring / Communications Cable.
Note:
• Terminal screws will become loose during transport. Properly
tighten the terminal connections during installation.
A voltage drop will cause the following problems:
• Magnetic switch vibration, fuse breaks, or disturbance to the
normal function of an overload protection device.
• Compressor will not receive the proper starting current.
Connect Power Wiring and
Communications Cable
1. Insert the power wiring / communications cable from the outdoor
unit or branch distribution unit (Multi F MAX systems only) through
the bottom of the indoor unit.
2. Connect each wire to its appropriate terminal on the indoor unit
control board. Verify that the color and terminal numbers from the
outdoor unit or branch distribution unit (Multi F MAX systems only)
wiring match the color and terminal numbers on the indoor unit.
3. Secure power wiring/communications cable with cable restraint.
Figure 84:Simplied View of Indoor Unit to Outdoor Unit / Branch
Distribution Unit Terminal Connections—LMN079HVT, LSN090HSV5,
LSN120HSV5 and LMN159HVT.
Outdoor Unit Terminal Block or
Multi F and Multi F MAX Indoor Unit Engineering Manual
GND
Indoor Unit Terminal Block
32(L2)1(L1)
BR
BL
GRN / YLW
RD
Branch Distribution Unit Terminal Block
(Multi F MAX Systems Only)
3 or S
GND
Figure 85:Simplied View of Indoor Unit to Outdoor Unit / Branch
Distribution Unit Terminal Connections— LSN180HSV5 and
LMN249HVT.
GND
Indoor Unit Terminal Block
1(L1 )2(L2)
BR
GRN / YLW
Outdoor Unit Terminal Block or
Branch Distribution Unit Terminal Block
(Multi F MAX Systems Only)
3
BL
RD
3 or S
GND
68 | STD. WALL-MOUNTED
Due to our policy of continuous product innovation, some specications may change without notication.
Figure 87:Wired Controller Connection on Indoor Unit Terminal Block—
LMN079HVT, LSN090HSV5, LSN120HSV5, and LMN159HVT Models.
GND
1(L1 )2(L2)
BR
BL
3
RD
To Outdoor Unit or Branch Distribution Unit
CN-REMO
To Wired Controller
Figure 88:Wired Controller Connection on Indoor Unit Terminal Block—
LSN180HSV5 and LMN249HVT Models.
GND
1(L1 )2(L2)
BR
To Outdoor Unit or Branch Distribution Unit
(Multi F MAX Systems Only)
Wired Controller Placement
Wired controllers include a sensor to detect room temperature. To maintain comfort
levels in the conditioned space, the wired controller must be installed in a location away
from direct sunlight, high humidity, and where it could be directly exposed to cold air.
Controller must be installed four (4) to five (5) feet above the floor where its LED display
can be read easily, in an area with good air circulation, and where it can detect an average room temperature.
Do not install the wired controller near or in:
• Drafts or dead spots behind doors and in corners
• Hot or cold air from ducts
• Radiant heat from the sun or appliances
• Concealed pipes and chimneys
• An area where temperatures are uncontrolled, such as an outside wall
CN-REMO
BL
3
RD
Figure 89:Proper Location for the Wired Controller.
Multi F and Multi F MAX Indoor Unit Engineering Manual
70 | STD. WALL-MOUNTED
Due to our policy of continuous product innovation, some specications may change without notication.
1. The controller wiring / cable can be installed in one of three direc-
tions: top, back, or on the right side. If top or right side installation
is desired, remove cable guide grooves on the controller, and
then position wiring / cable on applicable side.
2. Choose and mark the area of installation. Use the provided parts
and screw the wall plate into place. Install the controller wall plate
to fit the electrical box if one is present. Ensure that no gaps exist
between the wall plate and the wall itself.
3. Arrange wiring / cables so as not to interfere with the controller
circuitry. Position the wired controller on the wall plate. Snap into
place by pressing the bottom part of the wired controller onto
the wall plate. Make sure that no gaps exist between the wired
controller and the wall plate on all sides.
4. To remove wired controller from the wall plate, insert a screw-
driver into the two holes at the bottom. Twist screwdriver to
release controller. Do not damage the controller components
when removing.
Figure 91:Removing the Cable Guide Grooves.
Top
Back
Figure 92:Attaching the Wall Plate.
Right
Side
Figure 93:Installing / Removing
the Controller.
Right
Side
Standard Wall-Mounted
Assigning the Thermistor for Temperature Detection
Each indoor unit includes a return air thermistor assigned to sense the temperature. If a wired controller is installed, there is a choice of
sensing temperature with either the indoor unit return air thermistor or the thermistor in the wired controller. It is also an option to set both
thermistors to sense temperature so that indoor unit bases its operation on the first thermistor to reach the designated temperature differential. For applicable indoor units, an optional Remote Temperature Sensor can be used in lieu of the return air thermistor—either alone or in
conjunction with a wired controller thermistor as previously described.
Finalizing Indoor Unit Installation
1. Move the tubing clamp to its original position.
2. Ensure the three (3) hooks are properly attached to the installa-
tion plate by gently shaking the indoor unit from side to side.
3. Press the bottom left and right sides of the indoor unit against the
installation plate until the hooks click firmly into their slots.
4. Using two (2) Type “C” screws, secure the bottom of the indoor
unit to the installation plate.
5. Remove the two (2) tabs from the filter.
6. Replace the frame cover.
Figure 90:Attach Bottom of Indoor Unit to Installation Plate.
Type 'C' screws
Figure 94:Removing the Filter Tabs.
Due to our policy of continuous product innovation, some specications may change without notication.
“Air Velocity and Temperature Distribution” on page 81
“Refrigerant Flow Diagram” on page 82
“Wiring Diagram” on page 83
“Factory Supplied Parts and Materials” on page 84
“Installation and Best Layout Practices” on page 85
Page 73
MULTI
F
MAX
MULTI
F
LOW WALL CONSOLE INDOOR UNITS
Mechanical Specications and Features
Low Wall Console Indoor Units
General
All LG indoor units are factory assembled, wired, piped, and provided
with a control circuit board, fan, and motor. Low Wall Console units
have a sound rating no higher than 44 dB(A) as tested per KSA0701
ISO Low 3745.
Coil
Indoor unit coils are comprised of a minimum of two rows of
aluminum fins mechanically bonded to copper tubing. The coils are
pressure tested at the factory. Each unit is provided with a factory
installed condensate drain pan below the coil.
Refrigerant System
The system is designed for use with R410A refrigerant. The refrigeration circuit is pressure-tested at the factory and shipped with a
holding charge of helium gas. Refrigerant pipe connections are 45°
flare. All refrigerant lines from the outdoor unit to the indoor units
must be field insulated.
Electrical
The indoor units require 208–230Vac/60Hz/1Φ power with voltage
variance of no more than ±10%.
Casing
The units mount on a vertical surface. They are shipped with a separate back plate that secures the unit to the wall, protruding no more
than nine (9) inches. Refrigerant piping can be installed in one (1) of
four (4) different directions.
Finish
The Low Wall Console unit has a case with a beige-white panel. It
is manufactured of heavy-duty acrylonitrile butadiene styrene (ABS)
and high impact polystyrene (HIPS) plastic.
Fan Assembly and Control
The unit has a single, direct-drive, turbo fan made of high strength
ABS plastic. The fan motor is brushless digitally controlled (BLDC)
with permanently lubricated and sealed ball bearings. The fan / motor
assembly is mounted on vibration attenuating rubber grommets. Fan
speed is controlled using a microprocessor-based direct digitally
controlled algorithm that provides pre-programmed, eld-selectable
xed or auto fan speeds in the Heating and Cooling modes. For Low
Wall Console units, the indoor fan has Low, Med, High, Jet Cool, and
Auto settings for Cooling mode; and has Low, Med, High, Jet Heat,
and Auto settings for Heating mode. The Auto setting adjusts the
fan speed based on the difference between the controller setpoint
and space temperature. Also, the separate Chaos setting provides a
simultaneous and random change in fan speed and ow direction at
the discharge, simulating a natural outdoor breeze.
Air Filter
The return air inlet
has a factorysupplied primary
removable, washable
filter. The filter is accessed from the front
of the unit without the
use of tools.
Figure 95: Multi F Low Wall Console Indoor Unit.
Airflow Guide
Vanes
A factory-installed
motorized guide vane controls the direction of airflow up and down
for uniform air distribution. Side to side control is manual.
Microprocessor Control
The indoor unit has an integrated control panel to communicate with
the outdoor unit. All unit operation parameters are stored in non-volatile memory resident on the unit microprocessor. The microprocessor
controls space temperature through using the value provided by the
temperature sensors within the indoor unit. The microprocessor control will activate indoor unit operation when the indoor room temperature falls below or rises above a setpoint temperature, at which point,
a signal is sent to the outdoor unit to begin the appropriate mode. The
microprocessor also provides self-diagnostics and auto restart func-
tions. A eld-supplied four-wire power / communications cable must
be installed to connect the indoor unit(s) to the outdoor unit.
Controls
The indoor unit casing has an integral infrared sensor to communicate with the supplied LG wireless handheld remote controller. An
optional LG supplied wired controller is available as an additional
accessory. Communication between the indoor units and the outdoor
unit is accomplished through 14 AWG, four-core, stranded and
shielded power / communication cable. The indoor unit has an option
for wi-fi and can be controlled with LG’s SmartThinQ app on a smart
device. A field-supplied wi-fi network and smart device are required.
The SmartThinQ app is free and is available for Android and iOS
smart devices.
Condensate
The unit is designed for gravity draining of condensate and includes
a flexible drain hose capable of installation in one of two directions.
The unit also includes a connection that is compatible with the AquaGuard® AG-9300-LG condensate sensor.
Low Wall Console
Features
• Inverter (Variable speed fan)
• Comfort Air
• Jet cool/Jet Heat
• Group control
• Auto operation
• Auto restart operation
Due to our policy of continuous product innovation, some specications may change without notication.
Table 34: Multi F Low Wall Console Indoor Unit General Data.
Model NameLQN090HV4LQN120HV4LMQN150HV
Nominal Cooling Capacity (Btu/h)
Nominal Heating Capacity (Btu/h)
1
1
Operating Range
Cooling (°F WB)
Heating (°F DB)
Fan
Type
Motor Output (W) x Qty.
Motor/Drive
Airflow Rate CFM (Max/H/M/L)
Unit Data
Refrigerant Type
2
Refrigerant Control
Power Supply V, Ø, Hz3
Rated Amps (A)
Sound Pressure Level 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 FPI ) x Qty.
Pipe Size
Liquid (in.)
Vapor (in.)
Connection Size
Liquid (in.)
Vapor (in.)
Drain O.D. / I.D. (in.)
Multi F and Multi F MAX Indoor Unit Engineering Manual
1
Nominal capacity is rated 0 ft. above sea level with corresponding refrigerant piping length in
accordance with low 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 35: Multi F Low Wall Console Indoor Units Cooling Capacity Table.
Model No. /
Nominal Capacity
of Indoor Unit
(Btu/h)
LQN090HV4
9,000
LQN120HV4
12,000
Multi F and Multi F MAX Indoor Unit Engineering Manual
TC = Total Capacity (kBtu/h).
SHC: Sensible Heat Capacity (kBtu/h).
Nominal capacity as rated 0 ft. above sea level and a 0 ft. level difference between outdoor and indoor units. Corresponding refrigerant piping length is accordance with low length of each outdoor unit.
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).
The shaded table columns and rows indicate reference data. When operating at this temperature, these values can be different if the system is not running consistently.
Nominal capacity as rated 0 ft. above sea level and a 0 ft. level difference between outdoor and indoor units. Corresponding refrigerant piping length is accordance with low length of each outdoor unit.
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).
The shaded table columns and rows indicate reference data. When operating at this temperature, these values can be different if the system is not running consistently.
Due to our policy of continuous product innovation, some specications may change without notication.
Table 37: Multi F Low Wall Console Indoor Units Heating Capacity Table.
Model No. /
Nominal Capacity of
Indoor Unit (Btu/h)
LQN090HV4
9,000
LQN120HV4
12,000
LMQN150HV
15,710
Multi F and Multi F MAX Indoor Unit Engineering Manual
TC = Total Capacity (kBtu/h).
Nominal capacity as rated 0 ft. above sea level and a 0 ft. level difference between outdoor and indoor units. Corresponding refrigerant piping length is accordance with low length of each outdoor unit. 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).
Figure 98:LQN090HV4 and LQN120HV4 Sound Pressure Level Diagrams.
• Measurement taken 2.6′ below the bottom of the unit and at a
distance of 3.3′ from face of unit.
• Measurements taken with no attenuation and units operating at full
load normal operating condition.
• Sound level will vary depending on a range of factors such as
construction (acoustic absorption coefficient) of particular area in
which the equipment is installed.
• Sound power levels are measured in dB(A).
• Tested in anechoic chamber per ISO Low 3745.
Table 38: Sound Pressure Levels (dB[A]).
Sound Pressure Levels (dB[A]) (Cooling and Heating)
Due to our policy of continuous product innovation, some specications may change without notication.
0
0
8.9
6.6
66.2
73.4
3.3
60.8
0 ft
0 ft
Temperature [°F]
82.4
0ft
0
8.9
86.0
89.6
86.0
89.6
3.3 6.6 9.8 13.1 16.4
6.6
93.2
3.3
89.6
0 ft
0 ft
STD. WALL-MOUNTED | 81
Page 82
MULTI
F
MAX
MULTI
F
LOW WALL CONSOLE INDOOR UNITS
Refrigerant Flow Diagram
Figure 102:Multi F Low Wall Console Indoor Unit Refrigerant Flow Diagram.
Heat exchanger
Heating
Cooling
Turbo fan
M
Thermistor for
Evaporator inlet
temperature
DescriptionPCB Connector
Thermistor for suction air temperatureCN-ROOM
Thermistor for evaporator inlet temperatureCN-PIPE / IN
Thermistor for evaporator outlet temperatureCN-PIPE / OUT
Thermistor for
Evaporator
outlet temperature
Gas pipe connection port
(flare connection)
Thermistor for
suction air
temperature
Liquid pipe connection port
(flare connection)
Refrigerant pipe connection port diameters
Model
LQN090HV4
LQN120HV4
Multi F and Multi F MAX Indoor Unit Engineering Manual
Refrigerant pipe connection pipe sizes
82 | STD. WALL-MOUNTED
LMQN150HV
Model
LQN090HV4
LQN120HV4
LMQN150HV
Due to our policy of continuous product innovation, some specications may change without notication.
Multi F and Multi F MAX Indoor Unit Engineering Manual
Installation work must be performed by trained personnel and in accordance with national wiring lows and all local or other applicable codes. Improper installation can result in re, electric shock, physical injury, or death.
Note:
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.
84 | STD. WALL-MOUNTED
Due to our policy of continuous product innovation, some specications may change without notication.
• Place the unit where air circulation will not be blocked.
• Place the unit where drainage can be obtained easily.
• Place the unit where noise prevention is taken into consideration.
• Ensure there is sufficient space from the ceiling and floor.
More than
11-13/16 (300)
• Ensure there is sufficient maintenance space.
• Locate the indoor unit where it can be easily connected to the outdoor unit or branch
distribution unit.
Don’ts
• Do not install the unit near a heat or steam source, or where considerable amounts of oil,
iron powder, or flour are used.
• Do not install the unit where sulfuric acid and flammable or corrosive gases are generated,
vented into, or stored.
• Do not install the unit near high-frequency generators.
• Do not install the unit near a doorway.
The unit will be damaged, will malfunction, and / or will not operate as designed if
installed in any of the conditions listed.
• Indoor units (IDUs) must not be placed in an environment where the IDUs will be exposed to harmful volatile organic compounds (VOCs)
or in environments where there is improper air make up or supply or inadequate ventilation. If there are concerns about VOCs in the environment where the IDUs are installed, proper air make up or supply and/or adequate ventilation must be provided. Additionally, in buildings
where IDUs will be exposed to VOCs, consider a third party factory-applied epoxy coating to the fan coils for each IDU where the entire coil
is dipped, not sprayed.
• If the unit is installed near a body of water, the installation parts are at risk of corroding. Appropriate anti-corrosion methods must be taken for
the unit and all installation parts.
9-27/32 (250) or below
from the Floor
More than
11-13/16 (300)
More than
11-13/16 (300)
[Unit : inch (mm)]
Low Wall Console
Installing in an Area Exposed to Unconditioned Air
In some installation applications, areas (floors, walls) in some rooms will be exposed to unconditioned air (room will be above or next to an
unheated garage or storeroom). To countermeasure:
• Verify that carpet is or will be installed (carpet will increase the temperature by three degrees).
• Add insulation between the floor joists.
• Install radiant heat or another type of heating system to the floor.
Selecting Installation Method
The unit can be installed in one of three configurations:
• On the floor.
• Mounted on the wall above floor molding.
• Half concealed (recessed) in an opening in the wall.
If the unit is installed near a body of water, certain components are at risk of being corroded. Appropriate anti-corrosion methods must be taken for the
unit and all components.
6 screw (M*25L)
Figure 105:Floor Installation
2-17/32 (64)
(180)
7-3/32
5-1/2
(140)
(170)
6-11/16
8-9/32 (210)
1-3/16 (30.5)
Due to our policy of continuous product innovation, some specications may change without notication.
If the drain hose is routed inside the room
insulate the hose with an insulation material*
so that dripping from sweating (condensation)
will not damage furniture or floors.
* Foamed polyethylene or equivalent is
recommended.
Connecting the installation pipe and
drain hose to the indoor unit.
1. Align the center of the pipes and sufficiently
tighten the flare nut by hand.
2. Tighten the flare nut with a wrench.
Indoor unit tubingFlare nutPipes
Tape
Connecting
cable
Drain hose
Connecting pipe
Outside diameterTorque
mm inch kgf.m
Ø6.35 1/4 1.8~2.5
Ø9.52 3/8 3.4~4.2
Ø12.7 1/2 5.5~6.5
Ø15.88 5/8 6.3~8.2
Ø19.05 3/4 9.9~12.1
3. When needed to extend the drain hose of
indoor unit, assemble the drain pipe as
shown on the drawing
Wrap the insulation material around
the connecting portion.
1. Overlap the connection pipe insulation
material and the indoor unit pipe insulation
material. Bind them together with vinyl tape
Multi F and Multi F MAX Indoor Unit Engineering Manual
so that there may be no gap.
2. Wrap the area which accommodates the rear
piping housing section with vinyl tape.
3. Bundle the piping and drain hose together by
wrapping them with vinyl tape sufficient
enough to cover where they fit into the rear
piping housing section.
Connection pipe
Vinyl tape (wide)
Wrench
Indoor unit tubing
Drain pipe
Pipe
Open-end wrench (fixed)
Indoor unit drain hose
Vinyl tape(narrow)
Adhesive
Wrap with vinyl tape
Connecting cable
Vinyl tape(narrow)
Wrap with vinyl tape
Flare nut
Connection pipe
Insulation material
Indoor unit pipe
Pipe
88 | STD. WALL-MOUNTED
Drain hose
Due to our policy of continuous product innovation, some specications may change without notication.
• Follow manufacturer’s circuit diagrams in the technical manuals.
• Confirm power source specifications.
• Confirm that the electrical capacity is sufficient.
• Starting current must be maintained ±10 percent of the rated current marked on the outdoor unit name plate.
• Confirm cable thickness specifications.
• It is required that a circuit breaker is installed, especially if conditions could become wet or moist.
• Include a disconnect in the power wiring system, add an air gap contact separation of at least 1/8 inch in each active (phase) conductor.
• Loose wiring will cause unit to malfunction, overheat, and catch
fire, resulting in severe injury or death.
Note:
• Terminal screws will become loose during transport. Properly
tighten the terminal connections during installation.
A voltage drop will cause the following problems:
• Magnetic switch vibration, fuse breaks, or disturbance to the
normal function of an overload protection device.
• Compressor will not receive the proper starting current.
Connect Power Wiring and
Communications Cable
1. Insert the power wiring / communications cable from the outdoor
unit or branch distribution unit (Multi F MAX systems only).
2. Remove screws 1 and 2 and remove control box cover.
3. Connect each wire to its appropriate terminal on the indoor unit
control board. Verify that the color and terminal numbers from the
outdoor unit or branch distribution unit (Multi F MAX systems only)
wiring match the color and terminal numbers on the indoor unit.
4. Secure power wiring/communications cable with cable restraint.
Figure 111:Simplied View of Indoor Unit to Outdoor Unit / Branch
Distribution Unit Terminal Connections
Figure 110: Connecting Power Wiring / Communications Cable.
11
3
3
2
2
Figure 112:Securing Wiring to Unit.
Terminal Block
Clamp Cord
Low Wall Console
Terminal Block of Indoor Unit
L(L1)N(L2)3
Outdoor
Due to our policy of continuous product innovation, some specications may change without notication.
Figure 114:Wired Controller Connection on Indoor Unit Terminal Block— .Figure 115:Wired Controller Connection on Indoor Unit Terminal Block—
Indoor Unit Terminal Block
GND
L (L1
)N (L2)
BR
BL
3
RD
GRN / YLW
To Outdoor Unit or Branch Distribution Unit
(Multi F MAX Systems Only)
CN-REMO
To Wired Controller
GND
L (L1)N (L2)
GRN / YLW
To Outdoor Unit or Branch Distribution Unit
(Multi F MAX Systems Only)
Wired Controller Placement
Wired controllers include a sensor to detect room temperature. To maintain comfort
levels in the conditioned space, the wired controller must be installed in a location away
from direct sunlight, high humidity, and where it could be directly exposed to cold air.
Controller must be installed four (4) to five (5) feet above the floor where its LED display
can be read easily, in an area with good air circulation, and where it can detect an average room temperature.
Do not install the wired controller near or in:
• Drafts or dead spots behind doors and in corners
• Hot or cold air from ducts
• Radiant heat from the sun or appliances
• Concealed pipes and chimneys
• An area where temperatures are uncontrolled, such as an outside wall
Indoor Unit Terminal Block
CN-REMO
BR
BL
3
RD
To Wired Controller
Figure 116:Proper Location for the Wired Controller.
Low Wall Console
Due to our policy of continuous product innovation, some specications may change without notication.
1. The controller wiring / cable can be installed in one of three direc-
tions: top, back, or on the right side. If top or right side installation
is desired, remove cable guide grooves on the controller, and
then position wiring / cable on applicable side.
2. Choose and mark the area of installation. Use the provided parts
and screw the wall plate into place. Install the controller wall plate
to fit the electrical box if one is present. Ensure that no gaps exist
between the wall plate and the wall itself.
3. Arrange wiring / cables so as not to interfere with the controller
circuitry. Position the wired controller on the wall plate. Snap into
place by pressing the bottom part of the wired controller onto
the wall plate. Make sure that no gaps exist between the wired
controller and the wall plate on all sides.
4. To remove wired controller from the wall plate, insert a screw-
driver into the two holes at the bottom. Twist screwdriver to
release controller. Do not damage the controller components
when removing.
Figure 117:Removing the Cable Guide Grooves.
Top
Back
Figure 118:Attaching the Wall Plate.
Right
Side
Figure 119:Installing / Removing
the Controller.
Right
Side
Assigning the Thermistor for Temperature Detection
Each indoor unit includes a return air thermistor assigned to sense the temperature. If a wired controller is installed, there is a choice of
sensing temperature with either the indoor unit return air thermistor or the thermistor in the wired controller. It is also an option to set both
thermistors to sense temperature so that indoor unit bases its operation on the first thermistor to reach the designated temperature differential. For applicable indoor units, an optional Remote Temperature Sensor can be used in lieu of the return air thermistor—either alone or in
conjunction with a wired controller thermistor as previously described.
Multi F and Multi F MAX Indoor Unit Engineering Manual
92 | STD. WALL-MOUNTED
Due to our policy of continuous product innovation, some specications may change without notication.
“Factory Supplied Parts and Materials” on page 106
“Installation and Best Layout Practices” on page 107
Page 94
DUCT (LOW STATIC) INDOOR UNITS
MULTI
F
MAX
MULTI
F
Mechanical Specications and Features
Ceiling-Concealed Duct (Low Static)
Indoor Unit
General
All LG indoor units are factory assembled, wired, piped, and provided with a control circuit board, fan, and motor. Ceiling-Concealed
Duct (Low Static) units have a sound rating no higher than 36 dB(A)
as tested per KSA0701 ISO Standard 3745, and are designed for
low-static pressure up to 0.20″WG.
Coil
Indoor unit coils are factory built and are comprised of aluminum fins
mechanically bonded to copper tubing. Each unit has two rows of
coils, which are pressure tested at the factory. Each unit is provided
with a factory installed condensate drain pan below the coil.
Refrigerant System
System is designed for use with R410A refrigerant. The refrigeration
circuit is pressure-tested at the factory and shipped with a holding
charge of helium gas. Refrigerant pipe connections are 45° flare,
and all refrigerant lines from the outdoor unit to the indoor units must
be field insulated.
Electrical
Each indoor unit is designed to operate using 208–230/60/1 power
with voltage variances of ±10%.
Figure 120: Ceiling-Concealed Duct (Low Static) Indoor Unit.
Air Filter
Return air is filtered with a factory-supplied, removable, washable
filter accessible from the rear of the indoor unit.
Microprocessor Control
The unit is provided with an integrated control panel to communicate
with the outdoor unit. All unit operation parameters are stored in nonvolatile memory residing on the unit microprocessor. The microprocessor controls space temperature through using the value provided
by the temperature sensor within the indoor unit. The microprocessor
control will activate indoor unit operation when the indoor room temperature falls below or rises above a setpoint temperature, at which
point, a signal is sent to the outdoor unit to begin the appropriate
mode. The microprocessor will also provide self-diagnostics and auto
restart functions. A field-supplied four-wire power / communications
cable must be installed to connect the indoor unit(s) to the outdoor
unit.
Casing
The case has a low profile design with a maximum height of 7.5
inches designed to mount fully concealed above a finished ceiling in
as little as 8 inches vertical space. Casing is manufactured of galvanized steel plate, and provided with hanger brackets designed to
support the weight on four corners. Unit has a front horizontal supply
air discharge outlet, and one rear horizontal return air inlet; unit is
also field-convertible for a rear bottom return.
Fan Assembly and Control
The units have at least two direct-drive, Sirocco fans made of
Multi F and Multi F MAX Indoor Unit Engineering Manual
high strength ABS HT-700 polymeric resin that are statically and
dynamically balanced. The fans are mounted on a common brushless digitally controlled (BLDC) motor with permanently lubricated
and sealed ball bearings. The fan / motor assembly is mounted on
vibration-attenuating rubber grommets. Fan speed is controlled using
a microprocessor-based direct digital control algorithm. The indoor
fan has Low, Med, High, and Auto settings for Cooling mode; and
has Low, Med, High, and Auto settings for Heating mode. Each of the
settings can be field-adjusted from the factory setting (RPM / ESP).
The Auto setting adjusts the fan speed based on the difference
between the controller set-point and space temperature.
The indoor units are Wi-Fi compatible with the addition of an LG WiFi module accessory, and can be controlled by LG’s Smart ThinQ™
app on a smart device. A field-supplied Wi-Fi network and smart
device are required. The Smart ThinQ app is free, and is available
for Android™ and iOS. (Android is a trademark of Google LLC.)
Controls
The indoor unit controller of choice must be ordered separately.
Communication between the indoor units and the outdoor unit is
accomplished through 14 AWG, four-core, stranded, shielded or
unshielded power / communication cable.
Condensate Lift/Pump
The indoor unit is provided with a factory installed and wired condensate lift/pump capable of providing a minimum 27.5 inch lift from the
bottom surface of the unit. Drain pump has a safety switch to shut off
the indoor unit if the condensate rises too high in the drain pan.
Due to our policy of continuous product innovation, some specications may change without notication.
• Self-diagnostics function
• Group control
• Wired controller ordered separately
• Wi-Fi compatible
Page 95
DUCT (LOW STATIC) INDOOR UNITS
MULTI
F
MAX
MULTI
F
Table 40: Multi F Ceiling-Concealed Low-Static Ducted Indoor Unit General Data.
Model NameLDN097HV4LDN127HV4LDN187HV4
Nominal Cooling Capacity (Btu/h)
Nominal Heating Capacity (Btu/h)
1
1
Operating Range
Cooling (°F WB)
Heating (°F DB)
Fan
Type
Motor Output (W) x Qty.
Motor/Drive
Airflow Rate CFM (H/M/L)
Factory Set External Static Pressure (in. wg)
Max. External Static Pressure (in. wg)
Unit Data
Refrigerant Type
2
Refrigerant Control
Power Supply V, Ø, Hz3
Rated Amps (A)
Sound Pressure Level dB(A) (H/M/L)4
Dimensions (W x H x D, in.)
27-9/16 x 7-15/32 x 27-9/1635-7/16 x 7-15/32 x 27-9/16
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 Line (in.)
Vapor Line (in.)
Connection Size
Liquid Line (in.)
Vapor Line (in.)
Drain O.D. / I.D. (in.)
1
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).
2
This unit comes with a dry helium charge.
9,00012,00018,000
10,40013,800 20,800
19 x 15 x 1, 19 x 1
318 / 247 / 194353 / 300 / 247530 / 441 / 353
0.400.80
30 / 26 / 2331 / 28 / 2736 / 34 / 31
395148.5
466057.3
(2 x 11 x 14) x 1(2 x 11 x 18) x 1
3
Acceptable operating voltage: 187V-253V.
4
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.
5
All power wiring / communications cable to the IDUs be minimum 14 AWG, 4-conductor, stranded,
shielded or unshielded (if shielded, must be grounded to chassis at ODU only) and must comply with
applicable local and national codes.
General Data / Specications
57-77
59-81
Sirocco
Ceiling-Concealed Duct (Low Static)
Brushless Digitally Controlled / Direct
0.10
0.20
R410A
EEV
208-230, 1, 60
4 x 14
1/4
3/81/2
1/4
3/81/2
1-1/4, 1
Due to our policy of continuous product innovation, some specications may change without notication.
Table 41: Multi F Ceiling-Concealed Duct (Low Static) Indoor Units Cooling Capacity Table.
Model No. /
Nominal Capacity
of Indoor Unit
(Btu/h)
LDN097HV4
9,000
LDN127HV4
12,000
TC = Total Capacity (kBtu/h).
SHC: Sensible Heat Capacity (kBtu/h).
Nominal capacity as rated 0 ft. above sea level and a 0 ft. level difference between outdoor and indoor units. Corresponding refrigerant piping length is accordance with standard length of each outdoor unit.
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).
The shaded table columns and rows indicate reference data. When operating at this temperature, these values can be different if the system is not running consistently.
Table 42: Multi F Ceiling-Concealed Duct (Low Static) Indoor Units Cooling Capacity Table (continued).
Model No. /
Nominal Capacity
of Indoor Unit
(Btu/h)
LDN187HV4
18,000
TC = Total Capacity (kBtu/h).
SHC: Sensible Heat Capacity (kBtu/h).
Nominal capacity as rated 0 ft. above sea level and a 0 ft. level difference between outdoor and indoor units. Corresponding refrigerant piping length is accordance with standard length of each outdoor unit.
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).
The shaded table columns and rows indicate reference data. When operating at this temperature, these values can be different if the system is not running consistently.
Table 43: Multi F Ceiling-Concealed Duct (Low Static) Indoor Units Heating Capacity Table.
Model No. /
Nominal Capacity of
Indoor Unit
(Btu/h)
LDN097HV4
9,000
LDN127HV4
12,000
LDN187HV4
18,000
TC = Total Capacity (kBtu/h).
Nominal capacity as rated 0 ft. above sea level and a 0 ft. level difference between outdoor and indoor units. Corresponding refrigerant piping length is accordance with standard length of each outdoor unit.
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 44: Multi F Ceiling-Concealed Duct (Low Static) External Static Pressure Setting Values Table.
Static Pressure (in. wg)0.00.040.080.120.160.20
Model No. / Nominal Capacity
of Indoor Unit (Btu/h)
LDN097HV4
9,000
LDN127HV4
12,000
LDN187HV4
18,000
• To get the desired air flow and external static pressure combination, use the setting value from the table. Using a setting value other
than that listed in the table will not provide the desired combination.
• Table data is based at 230V. Air flow rate varies according to voltage fluctuation.
Airflow Rate / CFMSetting Value
High3189810310811 6123130
Mid247828894102110118
Low1946976839199109
High3539599104109116124
Mid300869196101108116
Low24778828793100108
High530123125129134141145
Mid441109112117123129136
Low3539599104109116124
Multi F and Multi F MAX Indoor Unit Engineering Manual
100 | DUCT (LOW STATIC)
Due to our policy of continuous product innovation, some specications may change without notication.