LG MULTI F MAX Installation and operation manual

INDOOR UNIT ENGINEERING MANUAL
Indoor Units for Multi-Zone Heat Pump Systems
7,000 to 36,000 Btu/h
MULTI FMAX
MULTI F
Art CoolTM Mirror Wall-Mounted
Art CoolTM Gallery Wall-Mounted
Ceiling-Concealed Duct (High Static)
Four-Way Ceiling Cassette

EM-MultiFIDU-01-15
For continual product development, LG reserves the right to change specifications without notice.
©LG Electronics Inc.
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This document is for design purposes only.
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INTRODUCTION | 3
Introduction
MULTI FMAX
MULTI F
TABLE OF CONTENTS
Convergence of Technology,
Innovation, Flexibility, & Style....................................................4
Unit Nomenclature.......................................................................6
Outdoor Unit Overview ...............................................................7
Indoor Unit Overview ..................................................................8
Controls and Options Overview.................................................9
Art Cool Mirror Indoor Units.....................................................16
Mechanical Specications and Features...........................................16
General Data / Specications............................................................17
Dimensions........................................................................................18
Cooling Capacity Table......................................................................20
Heating Capacity Table......................................................................22
Acoustic Data ....................................................................................23
Air Velocity and Temperature Distribution..........................................25
Refrigerant Flow Diagram.................................................................. 26
Wiring Diagram..................................................................................27
Factory Supplied Parts and Materials................................................ 29
Installation and Best Layout Practices............................................... 30
Art Cool Gallery Indoor Units...................................................38
Mechanical Specications and Features...........................................38
General Data / Specications............................................................39
Dimensions........................................................................................40
Cooling Capacity Table......................................................................41
Heating Capacity Table......................................................................42
Acoustic Data ....................................................................................43
Air Velocity and Temperature Distribution..........................................44
Refrigerant Flow Diagram.................................................................. 45
Wiring Diagram..................................................................................46
Factory Supplied Parts and Materials................................................ 47
Installation and Best Layout Practices............................................... 48
Standard Wall-Mounted Indoor Units ......................................58
Mechanical Specications and Features...........................................58
General Data / Specications............................................................59
Dimensions........................................................................................60
Cooling Capacity Table......................................................................64
Heating Capacity Table......................................................................67
Acoustic Data ....................................................................................69
Air Velocity and Temperature Distribution..........................................71
Refrigerant Flow Diagram.................................................................. 74
Wiring Diagram..................................................................................75
Factory Supplied Parts and Materials................................................ 79
Installation and Best Layout Practices............................................... 80
Duct (Low Static) Indoor Units.................................................90
Mechanical Specications and Features...........................................90
General Data / Specications............................................................91
Dimensions........................................................................................92
Cooling Capacity Table......................................................................93
Heating Capacity Table......................................................................95
External Static Pressure....................................................................96
Acoustic Data ....................................................................................97
Refrigerant Flow Diagrams................................................................98
Wiring Diagram................................................................................100
Factory Supplied Parts and Materials.............................................. 101
Installation and Best Layout Practices............................................. 102
Duct (High Static) Indoor Units .............................................. 112
Mechanical Specications and Features......................................... 112
General Data / Specications.......................................................... 113
Dimensions...................................................................................... 114
Cooling Capacity Table.................................................................... 115
Heating Capacity Table.................................................................... 116
External Static Pressure / Acoustic Data ......................................... 117
Refrigerant Flow Diagrams.............................................................. 118
Wiring Diagrams.............................................................................. 119
Factory Supplied Parts and Materials / Installation .........................120
Installation and Best Layout Practices............................................. 121
Four-Way Ceiling Cassette Indoor Units...............................130
Mechanical Specications and Features.........................................130
General Data / Specications..........................................................131
Dimensions......................................................................................132
Dimensions......................................................................................133
Cooling Capacity Table....................................................................134
Heating Capacity Table....................................................................136
Acoustic Data ..................................................................................138
Air Velocity and Temperature Distribution........................................140
Refrigerant Flow Diagram................................................................ 142
Wiring Diagram................................................................................143
Factory Supplied Parts and Materials.............................................. 144
Installation and Best Layout Practices............................................. 145
Vertical-Horizontal Indoor Units.............................................154
Mechanical Specications and Features.........................................154
General Data / Specications..........................................................155
Dimensions......................................................................................156
Cooling Capacity Table....................................................................157
Heating Capacity Table....................................................................158
External Static Pressure..................................................................159
Acoustic Data ..................................................................................160
Refrigerant Flow Diagram................................................................ 161
Wiring Diagram................................................................................162
Factory Supplied Parts and Materials.............................................. 164
Installation and Best Layout Practices............................................. 165
Application Guidelines............................................................174
Equipment Selection Procedure......................................................174
Building Ventilation Design Guide ...................................................180
Placement Considerations............................................................... 185
Refrigerant Piping Design ......................................................192
Design Guideline Summary.............................................................192
Design Guideline Summary.............................................................193
Creating a Balanced System / Manual Layout Procedure 194
LG Engineered Multi F MAX Y-Branch Kit .......................................195
Refrigerant Charge..........................................................................196
Installation & Layout Best Practices .....................................199
Selecting Field-Supplied Copper Tubing .........................................199
Refrigerant Piping System Layout...................................................200
Piping Insulation ..............................................................................208
Condensate Drain Piping................................................................. 209
Y-Branch Kit..................................................................................... 211
Wiring Connections.................................................................214
General Information.........................................................................214
Power Wiring (208-230V) and
Communications Cable Details .......................................................217
Indoor Unit Group Control ...............................................................222
Acronyms.................................................................................223

Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
4|INTRODUCTION
Multi F and Multi F MAX Indoor Unit Engineering Manual
About LG Electronics, Inc.
LG Electronics, Inc. is a global leader and technology innovator
in consumer electronics, mobile communications, and home
appliances, employing more than 213,000 people in more than 60
countries worldwide. LG Electronics, Inc. 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 estab-
lished in 1968 and has built its lineup of residential and commercial
products to include VRF, Multi F, duct-free 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-dfs.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 differ-
ent cooling and heating situations. Installation by a qualified HVAC
contractor is safe and easy – little to no duct work or sheet metal is
required.
Multi F Systems
LG’s inverter heat pumps can support two, three, or four indoor
units that are typically installed in separate rooms. Each indoor unit
includes its own remote control, allowing the customer to set the
temperature individually. Indoor units are available in several differ-
ent congurations: Art Cool™ Mirror wall-mounted, Art Cool Gallery
wall-mounted, standard wall-mounted, four-way ceiling cassettes,
ceiling-concealed duct (high and low static), and vertical-horizontal air
handling models. Multi F MAX systems, released in 2012, can oper-
ate 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, ofces, 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 ofce complex, Multi
F is best suited to reach the farthest corners and elevations.
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-and-
forth pipe lengths, and fewer joints lowers installation costs and
minimizes potential leaking.
Quality Commitment
LG is committed to the success
of DFS projects. We provide
technical support during instal-
lation and commissioning. LG
offers a variety of classes
designed for installers and
servicers on Multi F installa-
tion. Classes are conducted
at LG’s training centers and in
field locations at various times
throughout the year and upon
special request.
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
64°F (WB) in heating
• Quiet and comfortable environment
• Reduced ductwork
CONVERGENCE OF TECHNOLOGY,
INNOVATION, FLEXIBILITY, & STYLE
MULTI F

PRODUCT
INTRODUCTION
“Unit Nomenclature” on page 6
“Outdoor Unit Overview” on page 7
“Indoor Unit Overview” on page 8
“Controls and Options Overview” on page 9

Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
6|INTRODUCTION
Multi F and Multi F MAX Indoor Unit Engineering Manual
MULTI FMAX
MULTI F
UNIT NOMENCLATURE
Multi-Zone Systems —Indoor Units and Outdoor Units
MAN 12 7HVT
Generation
Features:
H = Heat Pump
V = Inverter
T = High Wall-Mounted Indoor Unit
P = Art Cool Gallery Indoor Unit
Nominal Capacity
(Nominal cooling capacity in Btu/h):
Component:
AN: Art Cool™ Wall-Mounted Indoor Unit
N: Standard Wall-Mounted Indoor Unit
CN: Four-Way Ceiling-Cassette Indoor Unit
DN: Ceiling-Concealed Duct (Low Static) Indoor Unit
HN: Ceiling-Concealed Duct (High Static) Indoor Unit
VN: Vertical-Horizontal Air Handling Indoor Unit
U: Outdoor Unit
L = LG
07 = 7,000
09 = 9,000
12 = 12,000
15 = 15,000
18 = 18,000
24 = 24,000
36 = 36,000
54 = 54,000
L
Type: M = Multi-Zone
Branch Distribution Units
MBD 36
BD: Branch Distribution Unit
P = Part (Accessory)
P
Type: M = Multi-Zone
Family
Number of Port Connections
(Maximum Number of Connectable Indoor Units): 2, 3, 4
Generation: 0, 1
02
• 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.

Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp. INTRODUCTION | 7
Introduction
MULTI FMAX
MULTI F
OUTDOOR UNIT OVERVIEW
1Model number shows nominal capacity and frame size designator.
2Nominal 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).
3Minimum number of connectable indoor units is two (2).
Outdoor Unit Type Model Number1
Dimensions
(W x H x D)
(inches)
Nominal Cooling
Capacity Btu/h2
Net
Weight
(lbs.)
No. of
Connectable
Indoor Units3
Pipe Connections
(inches, O.D.)
(Liquid, Vapor)
Multi F Dual-Zone
LMU18CHV 34-1/4 x 25 25/32 x 12-19/32 18,000 99 2-2 1/4 x 2 Each,
3/8 x 2 Each
Multi F Tri-Zone
LMU24CHV 34-1/4 x 25 25/32 x 12-19/32 24,000 99 2-3 1/4 x 3 Each,
3/8 x 3 Each
Multi F Quad-Zone
LMU36CHV 37-13/32 x 32-27/32 x 13 36,000 137 2-4 1/4 x 4 Each,
3/8 x 4 Each
Multi F MAX Eight-Zone
LMU540HV 37-13/32 x 54-11/32 x 13 54,000 214 2-8 3/8 x 1 Each,
3/4 x 1 Each
Table 1: Summary Data—Multi F / Multi F MAX Outdoor Units

Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
8|INTRODUCTION
Multi F and Multi F MAX Indoor Unit Engineering Manual
MULTI FMAX
MULTI F
INDOOR UNIT OVERVIEW
1Model number shows nominal capacity and frame size designator.
2Nominal 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).
3H/M/L = High/Medium/Low.
Indoor Unit Type Model
Number1
Dimensions
(W x H x D)
(inches)
Nominal
Cooling
Capacity Btu/h2
Air Flow Rate
(CFM)
(H/M/L3)
Net
Weight
(lbs.)
Pipe
Connections
(inches, O.D.)
(Liquid, Vapor)
Art CoolTM Mirror Wall-Mounted LMAN097HVT 35-1/4 × 11-3/8 × 8-1/16 9,000 247 / 230 / 212 25 1/4, 3/8
LMAN127HVT 12,000 335 / 318 / 300
LMAN187HVT 40-9/16 x 12-25/32 x 9-21/32 18,000 572 / 501 / 434 35 1/4, 1/2
Art CoolTM Gallery Wall-Mounted
LMAN097HVP
23-5/8 x 23-5/8 x 5-25/32
9,000 272 / 208 / 155
32 1/4, 3/8
LMAN127HVP 11,200 314 / 258 / 198
Standard Wall-Mounted LMN077HVT 35-1/4 x 11-3/8 x 8-9/32 7,000 198 / 177 / 162 23 1/4, 3/8
LSN090HSV4 34-7/8 x 11-1/4 x 8-1/4 9,000 247 / 230 / 212 20 1/4, 3/8
LSN120HSV4 34-7/8 x 11-1/4 x 8-1/4 12,000 335 / 318 / 300 20 1/4, 3/8
LMN157HVT 35-1/4 x 11-3/8 x 8-9/32 14,300 371 / 318 / 247 23 1/4, 3/8
LSN180HSV4 40-9/16 x 12-13/16 x 9-13/16 18,000 572 / 501 / 434 31 3/8, 5/8
LMN247HVT 40-9/16 x 12-25/32 x 9-27/32 24,000 720 / 600 / 466 32 1/4, 1/2
Ceiling-Concealed Duct
(Low Static) LMDN096HV 27-9/16 x 7-15/32 x 27-9/16 9,000 318 / 247 / 194 39
1/4, 3/8
LMDN126HV
35-7/16 x 7-15/32 x 27-9/16
12,000 353 / 300 / 247
51
LMDN186HV 18,000 530 / 441 / 353 1/4, 1/2
Ceiling-Concealed Duct
(High Static) LMHN240HV
46-17/32 x 11-23/32 x 17-23/32
24,000 688 / 618 / 530 80 1/4, 1/2
LMHN360HV 36,000 1,130 / 953 / 706 91 3/8, 5/8
Four-Way Ceiling-Cassette LMCN077HV
Body: 22-7/16 x 8-7/16 x 22-7/16
Panel: 27-9/16 x 7/8 x 27-9/16
7,000 265 / 212 / 177
31 (Body),
7 (Panel) 1/4, 3/8LMCN097HV 9,000 300 / 265 / 230
LMCN125HV 12,000 335 / 283 / 247
LMCN185HV Body: 22-7/16 x 10-3/32 x 22-7/16
Panel: 27-9/16 x 7/8 x 27-9/16 18,000 459 / 424 / 388 34 (Body),
7 (Panel) 1/4, 1/2
Vertical-
Horizontal
Air Handling LMVN240HV
18 x 48-21/32 x 21-1/4
24,000 710 / 640 / 480 117 1/4, 1/2
LMVN360HV 36,000 990 / 880 / 800 121 3/8, 5/8
Table 2: Summary Data—Multi F Indoor Units.

Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp. INTRODUCTION | 9
Introduction
MULTI FMAX
MULTI F
CONTROLS AND OPTIONS OVERVIEW
Zone Controller Name Model / Part No. Case
Color
Max. Wire
Length (ft.) Description
Simple Controller
with Mode
Selection
PQRCVCL0 Black
164
Allows control of indoor unit ON / OFF, operation mode, fan
speed, and temperature setpoint for up to 16 indoor units.
Included with Ceiling-Concealed Duct (High Static and Low
Static1) and Vertical-Horizontal Air Handling1indoor units;
optional accessory for all other indoor unit types.
AKB729558161White
Simple Controller
without Mode
Selection
PQRCHCA0 Black
164 Allows control of indoor unit ON / OFF, fan speed, and
temperature setpoint for up to 16 indoor units.
PQRCHCA0QW White
LG 7-Day
Programmable
Thermostat
PREMTB10U White 164
Allows control of indoor unit ON / OFF, operation mode,
occupied / unoccupied temperature setpoints, fan speed, and
airflow direction for up to 16 indoor units. Programmable
schedule with five events per day.
Wireless
Controller
AKB736356063
AKB736356074
AKB738353125
AKB737576046
Ivory -
Allows control of indoor unit ON / OFF, operation mode, fan
speed, and temperature setpoint. Also provides subfunction
control. Included with Art Cool Mirror3and Gallery4 Wall-
Mounted, Standard HVT3 Wall-Mounted, Standard HSV5
Wall-Mounted, and Four-Way Cassette6 indoor units; optional
accessory for Duct and Vertical-Horizontal AHU with use of
wired controller.
Wall-Mounted
Remote
Temperature
Sensor
PQRSTA0 Ivory 50
Allows remote temperature measurement for four-way ceiling
cassette, ceiling-concealed duct, and vertical-horizontal air
handling indoor units.
Table 3: Summary Data—Zone Controllers.
1Simple Mode Controllers for the ceiling-concealed duct (high static and low static) and the vertical-horizontal air handling indoor units are also referenced by Model No. PQRCVCL0QW.
Before specifying or placing an order, refer to the V-Net Network Solutions Engineering Product Data Book, and review the detailed technical data provided to fully understand the capabilities and limitations of
these devices.
For information on controller capatibility, refer to the Controls and Options Table on page 12
Table 4: Summary Data—Controller Accessories.
Controller Accessory Name Model No. Description For
Auxiliary Heater
Relay Kit
PRARH0
Adds coordinated control of
an external heater with normal
heat pump operations. Contact
energizes at 2.7°F below
setpoint. De-energizes at
2.7°F above setpoint.
Ceiling-concealed duct (high static and low static)
and four-way ceiling cassette indoor units.
PRARS0 Standard and Art Cool Mirror wall-mounted indoor
units.

Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
10 |INTRODUCTION
Multi F and Multi F MAX Indoor Unit Engineering Manual
MULTI FMAX
MULTI F
Before specifying or placing an order, refer to the V-Net Network Solutions Engineering Product Data Book, and review the detailed technical data provided to fully understand the capabilities and limitations of
these devices.
For information on controller capabilities, refer to the Controls and Options Table on page 12.
Specialty Application
Device Name Model No. Connects to Application Binary Signals Input / Output Description
Dry Contact Unit
24 VAC PQDSB1
Indoor
Unit
ON / OFF, Run Status,
Error Status 1 / 2 Enables the indoor unit to be
controlled and monitored by
third-party controls using
binary inputs and outputs.
Dry Contact Unit
for Setback PQDSBC
ON / OFF, Mode, Controller
Lock, Power Save, Run
Status, Error Status
2 / 2
Dry Contact Unit
for Thermostat PQDSBNGCM1
ON / OFF, Thermo ON /
OFF, Mode, Fan Speed,
Run Status, Error Status
—
Enables the indoor unit to be
controlled and monitored by a
third-party thermostat or controller.
PI-485 V-net
Control
Integration
Board
PMNFP14A1 Outdoor
Unit — —
Control integration to LG V-net
controls (AC Smart Premium, ACP,
BACnet, LonWorks, etc.)
Power
Distribution
Indicator (PDI)
Premium
PQNUD1S41 Comm.
BUS
Energy Consumption
Monitoring 8 / 0
Monitors total outdoor unit power
consumption for up to eight
systems, and distributes per
indoor unit based on weighted
calculation.
Table 5: Summary Data— Zone Controller Communication Cables.
CONTROLS AND OPTIONS OVERVIEW
Table 6: Summary Data—Specialty Application Devices.
Before specifying or placing an order, refer to the V-Net Network Solutions Engineering Product Data Book, and review the detailed technical data provided to fully understand the capabilities and limitations of
these devices.
For information on controller capabilities, refer to the Controls and Options Table on page 12.
Communication Cable Name Model No. Max. Wire
Length (ft.) Description
Wired Remote Group Control
Cable Assembly PZCWRCG3 32 Required when grouping multiple indoor units with a
single zone controller.
Wired Remote / Group Control
Extension Cable PZCWRC1 32
Increases the distance between a remote controller
and an indoor unit, or between indoor units in a control
group.