Engineering Manual
'XHWRRXUSROLF\RIFRQWLQXRXVSURGXFWLQQRYDWLRQVRPHVSHFL¿FDWLRQVPD\FKDQJHZLWKRXWQRWL¿FDWLRQ
©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 is a global leader and technology innovator in con-
sumer 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 condition-
ing business unit was established 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 solu-
tions 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 sys-
tems are available in a variety of configurations to suit different cool-
ing and heating situations. Installation by a trained 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-
HQWFRQ¿JXUDWLRQV$UW&RRO0LUURUZDOOPRXQWHG$UW&RRO*DOOHU\
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 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-
SOLFDWLRQVDQGVL]HVVXFKDVVFKRROVKRWHOVKRVSLWDOVRI¿FHVDQG
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
ÀH[LELOLW\²ORQJSLSHUXQVDQGODUJHHOHYDWLRQGLIIHUHQFHV:KHWKHU\RXU
EXLOGLQJLVDFRQGRPLQLXPDKRWHODVFKRRORUDQRI¿FHFRPSOH[0XOWL
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
/*LVFRPPLWWHGWRWKHVXFFHVVRIGXFWIUHHSURMHFWV:HSURYLGH
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.
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
):%LQKHDWLQJ
• Quiet and comfortable environment
• Reduced ductwork
CONVERGENCE OF TECHNOLOGY,
INNOVATION, FLEXIBILITY, & STYLE
MULTI
F