LG LG3ZMSS150 Installation manual
Multi V, Multi F, and Single Zone Cassette Indoor Units Install Tips
WARNING
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CAUTION
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WARNING
The following pages present an overview of installation of LG’s Multi V, Multi F, and Single Zone cassette indoor
units, and is intended to supplement the technical and installation information provided through www.lghvac.com.
The review of basic operation and maintenance skills must reinforce industry established practices and provide
helpful tips to make equipment operation successful.
This installation guide is NOT intended to be a replacement for LG installation manuals, nor is it intended to cover ALL the logistics of installing LG
cassette indoor units. For detailed information on the procedures mentioned here, refer to the installation manual specic to your product. Always
comply with applicable local, state, and federal codes.
Safety Instructions - Installation
Do not store or use ammable gas or combusti-
bles near the unit.
There is risk of re, explosion, and physical injury or
death.
An authorized, trained technician licensed
locally and at the state level must install the
unit.
Improper installation by the user may result in
re, explosion, electric shock, physical injury or
death.
Wear protective gloves when handling equipment. Sharp edges may cause personal injury.
Always check for system refrigerant leaks
after the unit has been installed or serviced.
Exposure to high concentration levels of refrigerant gas may lead to illness or death.
Properly insulate all cold surfaces to prevent
“sweating.”
Cold surfaces such as uninsulated piping can
generate condensate that may drip and cause
a slippery surface condition and / or water
damage to interior surfaces.
Always check for system refrigerant leaks
after the unit has been installed.
Low levels may cause product failure.
Do not make refrigerant substitutions. Use
R-410A only.
If a different refrigerant is used, or air mixes
with original refrigerant, the unit will malfunc-
tion and be damaged.
Keep the unit upright during installation to
avoid vibration or water leakage.
When connecting refrigerant tubing, remem-
Be very careful when transporting the product. There is a risk of the product falling and
causing physical injury.
Use appropriate moving equipment to transport each frame; ensure the equipment is capa-
ble of supporting the weight of the equipment.
Dispose the packing materials safely.
Packing materials, such as nails and other
metal or wooden parts, may cause puncture
wounds or other injuries. Tear apart and throw
away plastic packaging bags so that children
Install the unit in a safe location where
nobody can step on or fall onto it. Do not
install the unit on a defective mounting.
It may result in an accident that causes physical
injury or death.
may not play with them and risk suffocation
and death.
Properly insulate all cold surfaces to prevent
“sweating.”
Install the unit considering the potential for
earthquakes.
Improper installation may cause the unit to fall
over, resulting in physical injury or death.
Cold surfaces such as uninsulated piping can
generate condensate that could drip, causing a
slippery surface that creates a risk of slipping,
falling, and personal injury.
ber to allow for pipe expansion.
Improper piping may cause refrigerant leaks
and system malfunction.
Do not use this equipment in mission critical or special-purpose applications such as
preserving foods, works of art, wine coolers
Do not install the unit in a noise-sensitive
area. Periodically check that the frame is not
or refrigeration. This equipment is designed to
provide comfort cooling and heating.
damaged.
Do not place IDUs in an environment where
There is a risk of equipment damage.
Install the unit in a safe location where
nobody can step on or fall onto it. Do not
install the unit on a defective stand.
There is a risk of unit and property damage.
the IDUs may 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
Install the drain hose to ensure adequate
drainage.
There is a risk of water leakage and property
damage.
up or supply and/or adequate ventilation
should 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
Do not store or use ammable gas /
is dipped, not sprayed.
combustibles near the unit.
There is a risk of product failure.
Safety Instructions - Wiring
High voltage electricity is required to operate
this system. Adhere to the U.S. National
Electric Code (NEC) and these instructions
when wiring.
Always ground the unit following local, state,
and NEC codes.
There is risk of re, electric shock, and physical
injury or death.
Properly size all circuit breakers or fuses.
There is risk of re, electric shock, explosion,
physical injury or death.
Improper connections and inadequate ground-
ing can cause accidental injury or death.
The information contained in this manual is
intended for use by an industry-qualied,
experienced, certied electrician familiar with
the NEC who is equipped with the proper
tools and test instruments.
Failure to carefully read and follow all instructions in this manual can result in equipment
malfunction, property damage, personal injury
or death.
All electric work must be performed by a
licensed electrician and conform to local building codes or, in the absence of local codes,
with the NEC, and the instructions given in
this manual.
If the power source capacity is inadequate or
the electric work is not performed properly, it
may result in re, electric shock, physical injury
or death.
Properly tighten all power lugs.
Loose wiring may overheat at connection
points, causing a re, physical injury or death.
Do not change the settings of the protection devices.
If the pressure switch, thermal switch, or other
protection devices are bypassed or forced to
work improperly, or parts other than those
specied by LG are used, there is risk of re,
Refer to local, state, and federal codes, and
use power wires of sufcient current capacity
and rating.
Wires that are too small may generate heat
and cause a re.
Secure all eld wiring connections with appropriate wire strain relief.
Improperly securing wires will create undue
stress on equipment power lugs. Inadequate
connections may generate heat, cause a re
electric shock, explosion, and physical injury or
death.
and physical injury or death.
Do not supply power to the unit until all electrical wiring, controls wiring, piping, installation, and refrigerant system evacuation are completed.
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Cassette Indoor Units Installation General Information
Cassette Indoor Units Installation Tips
This document contains general installation tips for installing LG cassette indoor units (IDU). Follow all applicable local and national codes
during installation. For more detailed information, refer to the individual unit’s installation manual on www.lghvac.com.
The typical unit installation includes:
• Selecting the installation location
• Installing the unit
• Connecting refrigerant pipes
• Connecting drain pipe
• Connecting communication and power wiring
• Installing the remote controller (if applicable)
Always follow your system diagrams, including the LATS diagram (if applicable).
Selecting the Installation Location
To avoid the possibility of re, do not install the unit in an area where combustible gas may 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.
Note:
Select a location for installing the indoor unit (IDU) that meets the following conditions:
• Where there is enough structural strength to bear the weight of the unit.
• Operating sound from the unit will not disturb occupants.
• Include enough space for service access.
• 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 may be damaged, may malfunction, and/or will not operate as
designed if installed in any of these conditions:
Do not install the unit near a heat or steam source, or where
considerable amounts of oil, iron powder, or flour are used. These
materials may generate condensate, cause a reduction in heat exchanger efficiency, or malfuction of the condensate drain. If this is
a potential problem, install a ventillation fan large enough to vent
out these materials
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 may
generate, flow, stagnate, or leak. There is the possibility of fire.
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 in an area where the unit will be exposed to volatile organic compounds.
Ceiling Board
19 -11/16
or more
W
A
L
L
Any objects in room
(cabinets, furniture, etc.)
Ceiling
Floor
Typical Clearances Around Installed Unit
No gap
required
Ceiling Board
Ceiling Cassette
39 - 3/8
or more
“A”
Below 36 kBtu: at least 70 - 7/8; not more than 11ft 9-23/32in
“A” =
Over 36 kBtu: at least 70 - 7/8; not more than 13ft 9-11/32in
19 -11/16
or more
Ceiling beam or
other obstruction
11 -13/16
or less
Unit: inch
Installing in an Area Exposed to Unconditioned Air
In some installation applications, areas (floors, walls) in some rooms may be exposed to unconditioned air.
The room may be above or next to an unheated garage or storeroom. To counter
this condition:
Installing Near a Heat or Steam Source
• Verify that carpet is or will be installed (carpet may increase
the temperature by three (3) degrees.
• Install radiant heat or another type of heating system to the floor.
• Add insulatiion between the floor joists.
2
Indoor Unit
Include enough
distance
Heat or steam source
Install a ventilation fan
with sufficient capacity
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