LG CT09F User manual

SINGLE CAC
Air Conditioner
SERVICE MANUAL(General)
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.
CONFIDENTIAL
Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

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Copyright © 2019 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Air Conditioner Service Manual
TABLE OF CONTENTS
Part 1 General Information ..........................................................................................................3
1. Safety Precautions........................................................................................................4
2. Model Line Up..............................................................................................................13
3. Nomenclature ..............................................................................................................16
Part 2 Functions & Controls......................................................................................................20
1. List of Functions & Accessory ..................................................................................21
2. Air Flow .......................................................................................................................32
3. Installation Functions.................................................................................................34
4. Reliability .....................................................................................................................39
5. Convenience Functions & Controls .........................................................................40
6. Special Function & KIT...............................................................................................48
Part 3 Basic Control ..................................................................................................................49
1. Normal operation ........................................................................................................50
2. Compressor control ...................................................................................................50
3. EEV( Electronic Expansion Valve) control ..............................................................50
Part 4 Trouble Shooting Guide ...............................................................................................52
1. Self-diagnosis Function ............................................................................................54
2. Pump Down ................................................................................................................55
3. Evacuation (All amount of refrigerant leaked) ........................................................56
4. Gas Charging (After Evacuation)..............................................................................57
5. Cycle Part ...................................................................................................................58
6. Electronic Parts..........................................................................................................58

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Copyright © 2019 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
1. Safety Precautions ............................................................................................................4
2. Model Line Up ...................................................................................................................13
3. Nomenclature....................................................................................................................16
Part 1 General Information

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Copyright © 2019 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Part 1 General Information
1. Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions must be followed.
nIncorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the follow-
ing indications.
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to properties only.
nMeanings of symbols used in this manual are as shown below.
Be sure not to do.
Be sure to follow the instruction.
Dangerous Voltage
Read the precautions in this manual carefully
before operating the unit.
This appliance is filled with flammable refrig-
erant (R32)
This symbol indicates that the Operation
Manual should be read carefully.
This symbol indicates that a service person-
nel should be handling this equipment with
reference to the Installation Manual.
1.1 Safety Precautions in Repair
Be sure to disconnect all remote electric power supplies before servicing. Internal
components and circuit boards are at main potential when the equipment is
connected to the power cables. This voltage is extremely dangerous and may
cause death or severe injury if come in contact with it.
Do not touch the discharging refrigerant gas during the repair work.
The refrigerant gas can cause frostbite.
Release the refrigerant gas completely at a well-ventilated place first.
Otherwise, when the pipe is disconnected, refrigerant gas or refrigerating
machine oil discharges and it can cause injury.
When the refrigerant gas leaks during work, execute ventilation. If the refrigerant
gas touches to a fire, poisonous gas generates. A case of leakage of the
refrigerant and the closed room full with gas is dangerous because a shortage of
oxygen occurs. Be sure to execute ventilation.
When removing the front panel or cabinet, execute short-circuit and discharge
between high voltage capacitor terminals. If discharge is not executed, an electric
shock is caused by high voltage resulted in a death or injury.
Be sure to provide the grounding when repairing the equipment in a humid or
wet place, to avoid electrical shocks.

Part 1 General Information
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Copyright © 2019 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Do not use a defective or underrated circuit breaker. Use the correctly rated
breaker and fuse. Otherwise there is a risk of fire or electric shock.
Install the panel and the cover of control box securely. Otherwise there is risk of
fire or electric shock due to dust, water etc.
Indoor/outdoor wiring connections must be secured tightly and the cable should
be routed properly so that there is no force pulling the cable from the connection
terminals. Improper or loose connections can cause heat generation or fire.
Do not touch, operate, or repaire the product with wet hands. Hoding the plug by
hand when taking out. Otherwise there is risk of electric shock or fire.
Use a vacuum pump or Inert (nitrogen) gas when doing leakage test or air
purge. Do not compress air or Oxygen and Do not use Flammable gases.
Otherwise, it may cause fire or explosion.
- There is the risk of death, injury, fire or explosion.
Do not turn on the breaker or power under condition that front panel, cabinet, top
cover, control box cover are removed or opened.
Otherwise, it may cause fire, electric shock, explosion or death.
The appliance shall be stored so as to prevent mechanical damage from
occurring.
Any person who is involved with working on or breaking into a refrigerant circuit
should hold a current valid certificate from an industry-accredited assessment
authority, which authorises their competence to handle refrigerants safely in
accordance with an industry recognised assessment specification.
Servicing shall only be performed as recommended by the equipment
manufacturer. Maintenance and repair requiring the assistance of other skilled
personnel shall be carried out under the supervision of the person competent in
the use of flammable refrigerants.
Keep any required ventilation openings clear of obstruction
• The appliance shall be stored in a room without continuously operating ignition
sources (for example: open flames, an operating gas appliance or an operating
electric heater).
• The appliance shall be stored in a well-ventilated area where the room size
corresponds to the room area as specified for operation
• Compliance with national gas regulations shall be observed

Part 1 General Information
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Copyright © 2019 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
• Refrigerant tubing shall be protected or enclosed to avoid damage.
• The installation of pipe-work shall be kept to a minimum
• When flared joints are reused indoors, the flare part shall be re-fabricated.
• When mechanical connectors are reused indoors, sealing parts shall be renewed.
• Do not use means to accelerate the defrosting process or to clean, other than
those recommended by the manufacturer.
• Do not pierce or burn.
• Be aware that refrigerants may not contain an odour.
• Ducts connected to an appliance shall not contain an ignition source.
• Two or more people must lift and transport the product. Avoid personal injury.
• Periodic (more than once/year) cleaning of the dust or salt particles stuck on the
heat exchanger by using water.
• Dismantling the unit, treatment of the refrigerant oil and eventual parts should be
done in accordance with local and national standards.
• Mechanical connections shall be accessible for maintenance purposes.
• Ducts connected to an appliance shall not contain an ignition source.
• The appliance shall be disconnected from its power source during service and
when replacing parts.
Pipe-work shall be protected from physical damage.
Checks to the area
Prior to beginning work on systems containing flammable refrigerants, safety
checks are necessary to ensure that the risk of ignition is minimised. For repair to
the refrigerating system, the following precautions shall be complied with prior to
conducting work on the system.
Work procedure
Work shall be undertaken under a controlled procedure so as to minimise the risk of
a flammable gas or vapour being present while the work is being performed.
General work area
All maintenance staff and others working in the local area shall be instructed on the
nature of work being carried out. Work in confined spaces shall be avoided. The
area around the workspace shall be sectioned off. Ensure that the conditions within
the area have been made safe by control of flammable material.
Checking for presence of refrigerant
The area shall be checked with an appropriate refrigerant detector prior to and during
work, to ensure the technician is aware of potentially flammable atmospheres. Ensure
that the leak detection equipment being used is suitable for use with flammable
refrigerants, i.e. non-sparking, adequately sealed or intrinsically safe.
Presence of fire extinguisher
If any hot work is to be conducted on the refrigeration equipment or any associated
parts, appropriate fire extinguishing equipment shall be available to hand. Have a
dry powder or CO2 fire extinguisher adjacent to the charging area.

Part 1 General Information
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Copyright © 2019 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
No ignition sources
No person carrying out work in relation to a refrigeration system which involves
exposing any pipe work that contains or has contained flammable refrigerant
shall use any sources of ignition in such a manner that it may lead to the risk of
fire or explosion. All possible ignition sources, including cigarette smoking,
should be kept sufficiently far away from the site of installation, repairing,
removing and disposal, during which flammable refrigerant can possibly be
released to the surrounding space. Prior to work taking place, the area around
the equipment is to be surveyed to make sure that there are no flammable
hazards or ignition risks. “No Smoking” signs shall be displayed.
Ventilated area
Ensure that the area is in the open or that it is adequately ventilated before
breaking into the system or conducting any hot work. A degree of ventilation
shall continue during the period that the work is carried out. The ventilation
should safely disperse any released refrigerant and preferably expel it externally
into the atmosphere.
Checks to the refrigeration equipment
Where electrical components are being changed, they shall be fit for the purpose
and to the correct specification. At all times the manufacturer’s maintenance and
service guidelines shall be followed. If in doubt consult the manufacturer’s
technical department for assistance.
The following checks shall be applied to installations using flammable
refrigerants:
- The actual refrigerant charge is in accordance with the room size within which
the refrigerant containing parts are installed
- The ventilation machinery and outlets are operating adequately and are not
obstructed
- If an indirect refrigerating circuit is being used, the secondary circuit shall be
checked for the presence of refrigerant
- Marking to the equipment continues to be visible and legible. Markings and
signs that are illegible shall be corrected
- Refrigeration pipe or components are installed in a position where they are
unlikely to be exposed to any substance which may corrode refrigerant
containing components, unless the components are constructed of materials
which are inherently resistant to being corroded or are suitably protected
against being so corroded.
Checks to electrical devices
Repair and maintenance to electrical components shall include initial safety checks
and component inspection procedures. If a fault exists that could compromise safety,
then no electrical supply shall be connected to the circuit until it is satisfactorily dealt
with. If the fault cannot be corrected immediately but it is necessary to continue
operation, an adequate temporary solution shall be used. This shall be reported to
the owner of the equipment so all parties are advised.

Part 1 General Information
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Copyright © 2019 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Initial safety checks shall include
- Capacitors are discharged: this shall be done in a safe manner to avoid
possibility of sparking.
- No live electrical components and wiring are exposed While charging,
recovering or purging the system.
- Continuity of earth bonding
Repairs to sealed components
During repairs to sealed components, all electrical supplies shall be
disconnected from the equipment being worked upon prior to any removal of
sealed covers, etc. If it is absolutely necessary to have an electrical supply to
equipment during servicing, then a permanently operating form of leak detection
shall be located at the most critical point to warn of a potentially hazardous
situation. Particular attention shall be paid to the following to ensure that by
working on electrical components, the casing is not altered in such a way that
the level of protection is affected. This shall include damage to cables, excessive
number of connections, terminals not made to original specification, damage to
seals, incorrect fitting of glands, etc. Ensure that apparatus is mounted securely.
Ensure that seals or sealing materials have not degraded such that they no
longer serve the purpose of preventing the ingress of flammable atmospheres.
Replacement parts shall be in accordance with the manufacturer’s specifications
NOTE
The use of silicon sealant can inhibit the effectiveness of some types of leak
detection equipment. Intrinsically safe components do not have to be isolated
prior to working on them.
Repair to intrinsically safe components
Do not apply any permanent inductive or capacitance loads to the circuit without
ensuring that this will not exceed the permissible voltage and current permitted
for the equipment in use. Intrinsically safe components are the only types that
can be worked on while live in the presence of a flammable atmosphere.
The test apparatus shall be at the correct rating. Replace components only with
parts specified by the manufacturer. Other parts may result in the ignition of
refrigerant in the atmosphere from a leak
Cabling Check
Cabling will not be subject to wear, corrosion, excessive pressure, vibration,
sharp edges or any other adverse environmental effects. The check shall also
take into account the effects of ageing or continual vibration from sources such
as compressors or fans.
Detection of flammable refrigerants
Under no circumstances shall potential sources of ignition be used in the
searching for or detection of refrigerant leaks. A halide torch (or any other
detector using a naked flame) shall not be used.

Part 1 General Information
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Copyright © 2019 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Leak detection methods
The following leak detection methods are deemed acceptable for systems containing
flammable refrigerants. Electronic leak detectors shall be used to detect flammable
refrigerants, but the sensitivity may not be adequate, or may need re-calibration.
(Detection equipment shall be calibrated in a refrigerant-free area.)
Ensure that the detector is not a potential source of ignition and is suitable for
the refrigerant used. Leak detection equipment shall be set at a percentage of
the LFL of the refrigerant and shall be calibrated to the refrigerant employed and
the appropriate percentage of gas (25 % maximum) is confirmed. Leak detection
fluids are suitable for use with most refrigerants but the use of detergents
containing chlorine shall be avoided as the chlorine may react with the
refrigerant and corrode the copper pipe-work. If a leak is suspected, all naked
flames shall be removed/extinguished. If a leakage of refrigerant is found which
requires brazing, all of the refrigerant shall be recovered from the system, or
isolated (by means of shut off valves) in a part of the system remote from the
leak. Oxygen free nitrogen (OFN) shall then be purged through the system both
before and during the brazing process.
Removal and evacuation
When breaking into the refrigerant circuit to make repairs – or for any other
purpose - conventional procedures shall be used. However, it is important that
best practice is followed since flammability is a consideration. The following
procedure shall be adhered to:
- Remove refrigerant
- Purge the circuit with inert gas
- Evacuate
- Purge again with inert gas
- Open the circuit by cutting or brazing.
The refrigerant charge shall be recovered into the correct recovery cylinders.
The system shall be “flushed” with OFN to render the unit safe. This process
may need to be repeated several times. Compressed air or oxygen shall not be
used for this task. Flushing shall be achieved by breaking the vacuum in the
system with OFN and continuing to fill until the working pressure is achieved,
then venting to atmosphere, and finally pulling down to a vacuum. This process
shall be repeated until no refrigerant is within the system. When the final OFN
charge is used, the system shall be vented down to atmospheric pressure to
enable work to take place. This operation is absolutely vital if brazing operations
on the pipe-work are to take place. Ensure that the outlet for the vacuum pump
is not close to any ignition sources and there is ventilation available.

Part 1 General Information
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Copyright © 2019 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Charging procedures
In addition to conventional charging procedures, the following requirements shall
be followed.
- Ensure that contamination of different refrigerants does not occur when using
charging equipment. Hoses or lines shall be as short as possible to minimise
the amount of refrigerant contained in them.
- Cylinders shall be kept upright.
- Ensure that the refrigeration system is earthed prior to charging the system
with refrigerant.
- Label the system when charging is complete (if not already).
- Extreme care shall be taken not to overfill the refrigeration system. Prior to
recharging the system it shall be pressure tested with OFN. The system shall
be leak tested on completion of charging but prior to commissioning. A follow
up leak test shall be carried out prior to leaving the site.
Decommissioning
Before carrying out this procedure, it is essential that the technician is
completely familiar with the equipment and all its detail. It is recommended good
practice that all refrigerants are recovered safely. Prior to the task being carried
out, an oil and refrigerant sample shall be taken in case analysis is required prior
to re-use of reclaimed refrigerant. It is essential that electrical power is available
before the task is commenced.
a) Become familiar with the equipment and its operation.
b) Isolate system electrically.
c) Before attempting the procedure ensure that: • mechanical handling
equipment is available, if required, for handling refrigerant cylinders; • all
personal protective equipment is available and being used correctly; • the
recovery process is supervised at all times by a competent person; • recovery
equipment and cylinders conform to the appropriate standards.
d) Pump down refrigerant system, if possible.
e) If a vacuum is not possible, make a manifold so that refrigerant can be
removed from various parts of the system.
f) Make sure that cylinder is situated on the scales before recovery takes place.
g) Start the recovery machine and operate in accordance with manufacturer's
instructions.
h) Do not overfill cylinders. (No more than 80 % volume liquid charge).
i) Do not exceed the maximum working pressure of the cylinder, even
temporarily.
j) When the cylinders have been filled correctly and the process completed,
make sure that the cylinders and the equipment are removed from site
promptly and all isolation valves on the equipment are closed off.
k) Recovered refrigerant shall not be charged into another refrigeration system
unless it has been cleaned and checked.

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Copyright © 2019 - 2020 LG Electronics Inc.
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Part 1 General Information
Be sure to earth the air conditioner with an earthing conductor connected to the
earthing terminal.
Conduct repair works after checking that the refrigerating cycle section has
cooled down sufficiently. Otherwise, working on the unit, the hot refrigerating
cycle section can cause burns.
Do not tilt the unit when removing panels. Otherwise, the water inside the unit
can spill and wet floor.
Labelling
Equipment shall be labelled stating that it has been de-commissioned and emptied
of refrigerant. The label shall be dated and signed. Ensure that there are labels on
the equipment stating the equipment contains flammable refrigerant.
Recovery
When removing refrigerant from a system, either for servicing or decommissioning,
it is recommended good practice that all refrigerants are removed safely.
When transferring refrigerant into cylinders, ensure that only appropriate refrigerant
recovery cylinders are employed. Ensure that the correct number of cylinders for
holding the total system charge are available. All cylinders to be used are
designated for the recovered refrigerant and labelled for that refrigerant (i.e. special
cylinders for the recovery of refrigerant). Cylinders shall be complete with pressure
relief valve and associated shut-off valves in good working order. Empty recovery
cylinders are evacuated and, if possible, cooled before recovery occurs. The
recovery equipment shall be in good working order with a set of instructions
concerning the equipment that is at hand and shall be suitable for the recovery of
flammable refrigerants. In addition, a set of calibrated weighing scales shall be
available and in good working order. Hoses shall be complete with leak-free
disconnect couplings and in good condition. Before using the recovery machine,
check that it is in satisfactory working order, has been properly maintained and that
any associated electrical components are sealed to prevent ignition in the event of
a refrigerant release. Consult manufacturer if in doubt. The recovered refrigerant
shall be returned to the refrigerant supplier in the correct recovery cylinder, and the
relevant Waste Transfer Note arranged. Do not mix refrigerants in recovery units
and especially not in cylinders. If compressors or compressor oils are to be
removed, ensure that they have been evacuated to an acceptable level to make
certain that flammable refrigerant does not remain within the lubricant. The
evacuation process shall be carried out prior to returning the compressor to the
suppliers. Only electric heating to the compressor body shall be employed to
accelerate this process. When oil is drained from a system, it shall be carried out
safely.

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Part 1 General Information
1.2 Inspections after Repair
Do not use the welder in a well-ventilated place. Using the welder in an enclosed
room can cause oxygen deficiency.
Be sure to turn off power switch before connect or disconnect connector, or parts
damage may be occurred.
Check to see if the parts are mounted correctly and wires are connected.
Improper installation and connections can cause an electric shock or an injury.
Check the installation platform or frame has corroded. Corroded installation
platform or frame can cause the unit to fall, resulting in injury.
Be sure to check the earth wire is correctly connected.
After the work has finished, be sure to do an insulation tset to check the
resistance is 2[Mohm] or more between the charge section and the non-charge
metal section (Earth position). If the resistance value is low, a disaster such as a
leak or electric shock is caused at user’s side.
Check the drainage of the indoor unit after the repair. If drainage is faulty the
water to enter the room and wet floor.
Check to see if the terminal block is not dirty or loose. If terminal block is dust or
loose it can cause an electrical shock or fire.
Do not use a joined power cable or extension cable, or share the same power
outlet with other electrical appliances. otherwise, it can cause an electrical shock,
excessive heat generation or fire.
Do not insert hands or other objects through the air inlet or outlet while the
product is operating. There are sharp and moving parts that could cause
personal injury.
Do not block the inlet or outlet of air flow. It may cause product failure

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Copyright © 2019 - 2020 LG Electronics Inc.
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2. Model Line Up
Part 1 General Information
2.1 Indoor units
Category Chassis
Name Grade Capacity Index [kW (kBtu/h)]
2.5 (9) 3.4 (12) 5.0 (18) 6.8 (24) 7.5 (30) 9.5 (36) 12.0 (42) 13.4 (48) 14.6 (60)
Ceiling
Cassette
4-Way
TR Standard
Compact CT09F CT12F
TQ
Standard
Compact CT18F NQ0
High UT09FH UT12FH
TP-B
Standard
Compact CT24F UT30F
High UT18FH
TM-A
Standard
Compact UT36F UT42F UT48F UT60F
High UT24FH UT30FH UT36FH UT42FH UT48FH UT60FH
Round TY Standard UT36F UT48F
Ceiling
Concealed
Duct
Low
Static
Pressure
L5
Standard
Compact CL09F CL12F
High UL12FH
L6 Standard
Compact CL18F
L3
Standard
Compact CL24F
High UL18FH
Mid
Static
Pressure
M1
Standard
Compact CM18F CM24F UM30F
High UM12FH UM18FH
M2
Standard
Compact UM36F UM42F
High UM24FH UM30FH
M3
Standard
Compact UM48F UM60F
High UM36FH UM42FH UM48FH
Ceiling
Suspended
VM1
Standard
Compact UV18F UV24F UV30F
High UV18FH
VM2
Standard
Compact UV36F UV42F UV48F UV60F
High UV24FH UV30FH UV36FH UV42FH
Console QA Standard
Compact UQ09F UQ12F UQ18F

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Copyright © 2019 - 2020 LG Electronics Inc.
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Part 1 General Information
2.2 Outdoor units
Model
Name
Chassis
Name
Capacity index of con-
nectable
indoor units [kW(kBtu/h)]
Power Supply Syncro
Availability
PCB
composition
Driver
[kW]
UUA1 UL2
2.5 (9)
1Φ, 220-240 V~, 50Hz -(1 Part)
Main PCB 23.4 (12)
5.0 (18)
UUB1 U24A
5.0 (18)
1Φ, 220-240 V~, 50Hz -(1 Part)
Main PCB 36.8 (24)
7.5 (30)
UUC1 U4
6.8 (24)
1Φ, 220-240 V~, 50Hz -(1 Part)
Main PCB 4.57.5 (30)
9.5 (36)
UUD1 U3
9.5 (36)
1Φ, 220-240 V~, 50Hz O
(4 Parts)
Cycle PCB
Inverter PCB
Fan PCB
Noise Filter
6
12.0 (42)
13.4 (48)
14.6 (60)
UUD3 U3
9.5 (36)
3Φ, 380-415 V~, 50Hz O
(4 Parts)
Cycle PCB
Inverter PCB
Fan PCB
Noise Filter
7
12.0 (42)
13.4 (48)
14.6 (60)
Category Chassis
Name Grade Capacity Index [kW (kBtu/h)]
2.5 (9) 3.4 (12) 5.0 (18) 6.8 (24) 7.5 (30) 9.5 (36) 12.0 (42) 13.4 (48) 14.6 (60)
Wall
Mounted
SJ Standard MJ09PC MJ12PC
SK Standard MJ18PC MJ24PC
SR
Standard
Compact US30F US36F

Part 1 General Information
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Copyright © 2019 - 2020 LG Electronics Inc.
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2.2 Outdoor units
1) Single Combination
- High
- Standard
- Compact
2) Synchro
Capacity
[kW(kBtu/h)]
Outdoor
Unit
Indoor Unit
Ceiling
Cassette
Ceiling Concealed Duct Ceiling
Suspended Console Wall Mounted
Low Static
Pressure
Mid Static
Pressure
2.5 (9) UUA1 CT09F CL09F UQ09F MJ09PC
3.4 (12) CT12F CL12F UQ12F MJ12PC
5.0 (18) UUB1 CT18F CL18F CM18F UV18F UQ18F MJ18PC
6.8 (24) UUC1 CT24F CL24F CM24F UV24F MJ24PC
7.5 (30) UT30F UM30F UV30F US30F
9.5 (36)
UUD1
/ UUD3
UT36F UM36F UV36F US36F
12.0 (42) UT42F UM42F UV42F
13.4 (48) UT48F UM48F UV48F
14.6 (60) UT60F UM60F UV60F
Outdoor Unit
Model Name
Indoor
Unit Model
IDU Quantity
Duo Trio Quartet
UUD1
/ UUD3
CT12F ● ●
CT18F ● ●
CT24F ●
UT30F ●
CL12F ● ●
CM18F ● ●
CM24F ●
UM30F ●
Capacity
[kW(kBtu/h)]
Outdoor
Unit
Chassis
Indoor Unit
Ceiling
Cassette
Ceiling Concealed Duct Ceiling
Suspended Console Wall Mounted
Low Static
Pressure
Mid Static
Pressure
2.5 (9) UUA1 UT09FH
3.4 (12) UT12FH UL12FH UM12FH
5.0 (18) UUB1 UT18FH UL18FH UM18FH UV18FH
6.8 (24) UUC1 UT24FH UM24FH UV24FH
7.5 (30) UT30FH UM30FH UV30FH
9.5 (36)
UUD1
/ UUD3
UT36FH UM36FH UV36FH
12.0 (42) UT42FH UM42FH UV42FH
13.4 (48) UT48FH UM48FH
14.6 (60) UT60FH
Capacity
[kW(kBtu/h)]
Outdoor
Unit
Indoor Unit
Ceiling
Cassette
Ceiling Concealed Duct Ceiling
Suspended Console Wall Mounted
Low Static
Pressure
Mid Static
Pressure
5.0 (18) UUA1 CT18F CL18F CM18F UV18F
6.8 (24) UUB1 CT24F CL24F CM24F UV24F
7.5 (30) UT30F UM30F UV30F US30F
9.5 (36) UUC1 UT36F UM36F UV36F US36F

Part 1 General Information
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Copyright © 2019 - 2020 LG Electronics Inc.
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3. Nomenclature
3.1 Indoor Unit
Serial number
N : Indoor Unit
Detailed product type
F : Free Combination
FH : Free Combination High Efficiency
Nominal Capacity
EX) 24,000 Btu/h Class → '24'
Product type
T : Ceiling Cassette Air Conditioner
B : Ceiling Concealed Duct Air Conditioner
V : Ceiling Suspended Air Conditioner
J : Wall Mounted Air Conditioner
Q : Console Air Conditioner
Connectable Outdoor unit type
U : Indoor units only for Single A systems
C : Indoor units for Single A & Multi systems (common use)
Chassis name
TC NF B 024
U31 0UU D
Serial number
Electrical rating
1 : 1Ø, 200-240V, 50Hz
3 : 3Ø, 380-415V, 50Hz
Model Type
U : Universal model
Type
U : Outdoor unit
Outdoor unit chassis name
Module name &
Nominal capacity range
based on ‘kBtu/h’
A : 9~18
B : 18~30
C : 24~36
D : 36~60
3.2 Outdoor Unit

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Part 1 General Information
Functions
A : Basic
C : Air cleaning
E : Elevation Grille
F : Floor Detecting + Air Cleaning
Chassis
A : TM-A, TP-B
Q : TR, TQ
Decoration Panel of Ceiling Cassette Type
Indoor Unit
A AP T G W 0
Look
Serial
Color
W : White B : Black
G : Grid
H : Horizontal
3.3 Decoration panel(For ceiling cassette models)

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Copyright © 2019 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Part 1 General Information
0
100
200
300
400
500
600
Amin (m2)
m (kg)
01.224 2 3 4 5 6 7 8
Floor standing
Wall mounted
Ceiling mounted
Minimum floor area
• The appliance shall be installed, operated and stored in a room with a floor area larger than the minimum area.
• Use the graph of table to determine the minimum area.
• m : Total refrigerant amount in the system
• Total refrigerant amount : factory refrigerant charge + additional refrigerant amount
• Amin : minimum area for installation

Part 1 General Information
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Copyright © 2019 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Floor standing
m (kg) Amin (m2)
< 1.224 -
1.224 12.9
1.4 16.82
1.6 21.97
1.8 27.80
2 34.32
2.2 41.53
2.4 49.42
2.6 58.00
2.8 67.27
3 77.22
3.2 87.86
3.4 99.19
3.6 111.20
3.8 123.90
4 137.29
4.2 151.36
4.4 166.12
Floor location
m (kg) Amin (m2)
4.6 181.56
4.8 197.70
5 214.51
5.2 232.02
5.4 250.21
5.6 269.09
5.8 288.65
6 308.90
6.2 329.84
6.4 351.46
6.6 373.77
6.8 396.76
7 420.45
7.2 444.81
7.4 469.87
7.6 495.61
7.8 522.04
Wall mounted
m (kg) Amin (m2)
< 1.224 -
1.224 1.43
1.4 1.87
1.6 2.44
1.8 3.09
2 3.81
2.2 4.61
2.4 5.49
2.6 6.44
2.8 7.47
3 8.58
3.2 9.76
3.4 11.02
3.6 12.36
3.8 13.77
4 15.25
4.2 16.82
4.4 18.46
Wall mounted
m (kg) Amin (m2)
4.6 20.17
4.8 21.97
5 23.83
5.2 25.78
5.4 27.80
5.6 29.90
5.8 32.07
6 34.32
6.2 36.65
6.4 39.05
6.6 41.53
6.8 44.08
7 46.72
7.2 49.42
7.4 52.21
7.6 55.07
7.8 58.00
Ceiling Mounted
m (kg) Amin (m2)
< 1.224 -
1.224 0.956
1.4 1.25
1.6 1.63
1.8 2.07
2 2.55
2.2 3.09
2.4 3.68
2.6 4.31
2.8 5.00
3 5.74
3.2 6.54
3.4 7.38
3.6 8.27
3.8 9.22
4 10.21
4.2 11.26
4.4 12.36
Ceiling Mounted
m (kg) Amin (m2)
4.6 13.50
4.8 14.70
5 15.96
5.2 17.26
5.4 18.61
5.6 20.01
5.8 21.47
6 22.98
6.2 24.53
6.4 26.14
6.6 27.80
6.8 29.51
7 31.27
7.2 33.09
7.4 34.95
7.6 36.86
7.8 38.83

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Copyright © 2019 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Part 2 Functions & Controls
1. List of Functions & Accessory......................................................................................21
2. Air flow ............................................................................................................................32
2.1 Auto swing (left & right) ...............................................................................................32
2.2 Auto swing (up & down) ..............................................................................................32
2.3 Chaos swing (up/down)...............................................................................................32
2.4 Air flow step.................................................................................................................33
2.5 Chaos wind (auto wind)...............................................................................................33
2.6 Jet Cool Mode Operation ............................................................................................33
2.7 Swirl wind Swing .........................................................................................................33
3. Installation Functions ....................................................................................................34
3.1 E.S.P. (External Static Pressure) Setting ....................................................................34
3.2 High Ceiling operation.................................................................................................38
4. Reliability ........................................................................................................................39
4.1 Hot start.......................................................................................................................39
4.2 Self-diagnosis Function...............................................................................................39
4.3 Soft dry operation........................................................................................................39
5. Convenience Functions & Controls ............................................................................40
5.1 Cooling & heating Operations .....................................................................................40
5.2 Auto cleaning operation...............................................................................................41
5.3 Auto changeover operation .........................................................................................41
5.4 Auto restart Opeartion .................................................................................................41
5.5 Child Lock Function.....................................................................................................42
5.6 Forced operation .........................................................................................................42
5.7 Group Control..............................................................................................................43
5.8 Sleep Timer Operation ................................................................................................44
5.9 Timer(On/Off) ..............................................................................................................44
5.10 Weekly Program........................................................................................................45
5.11 Two Thermistor Control .............................................................................................47
6. Special Function & KIT ..................................................................................................48
6.1 Low Ambient control....................................................................................................48
6.2 Space Control .............................................................................................................48