LG AMNW07GSJA0 User manual

Multi Air Conditioner
SVC MANUAL(General)
MODEL : Multi-Inverter Type(R410A)
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.
CONFIDENTIAL
Copyright © 2016 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

- 1 -
Copyright © 2016 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Air Conditioner Service Manual
TABLE OF CONTENTS
Part 1 General Information ..........................................................................................................2
1. Safety Precautions........................................................................................................3
2. Model Line Up..............................................................................................................12
3. Nomenclature ..............................................................................................................18
Part 2 Functions & Controls......................................................................................................21
1. List of Functions & Controls......................................................................................22
2. Air Flow .......................................................................................................................46
3. Air Purifying.................................................................................................................48
4. Installation Functions.................................................................................................49
5. Reliability .....................................................................................................................54
6. Convenience Functions & Controls .........................................................................55
7. Special Function & KIT...............................................................................................62
Part 3 Basic Control ..................................................................................................................65
1. Normal operation ........................................................................................................66
2 Compressor control ....................................................................................................66
3. EEV( Electronic Expansion Valve) control ...............................................................66
4. Oil return control ........................................................................................................67
5. Defrost control ...........................................................................................................67
Part 4 Test Run..........................................................................................................................68
1. Check before Test Run .............................................................................................69
2. Test Run Flow chart ..................................................................................................70
3. Test Runing.................................................................................................................71
Part 5 Trouble Shooting Guide ...............................................................................................74
1. Self-diagnosis Function .....................................................................................75
2. Pump Down .........................................................................................................77
3. Evacuation...........................................................................................................79
4. Gas Charging ......................................................................................................80
5. Cycle Part ............................................................................................................81
6. Electronic Parts...................................................................................................82
Part 6 Service Order.................................................................................................................174
1. PCB Service Order...................................................................................................175

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Copyright © 2016 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
1. Safety Precautions ............................................................................................................3
2. Model Line Up ...................................................................................................................12
3. Nomenclature....................................................................................................................18
Part 1 General Information

Part 1 General Information
- 3 -
Copyright © 2016 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
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
- 4 -
Copyright © 2016 - 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 © 2016 - 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.

5. Trouble Shooting
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Copyright © 2016 - 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.

5. Trouble Shooting
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Copyright © 2016 - 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.

5. Trouble Shooting
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Copyright © 2016 - 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.

5. Trouble Shooting
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Copyright © 2016 - 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.

5. Trouble Shooting
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Copyright © 2016 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
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.

5. Trouble Shooting
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Copyright © 2016 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
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

Part 1 General Information
- 12 -
Copyright © 2016 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
2. Model Line Up
2.1 Indoor units
Category Type Chassis
Model names
Capacity, kW(kBtu/h)
1.5
(5)
2.1
(7)
2.5
(9)
3.5
(12)
4.2
(15)
5.0
(18)
7.1
(24)
Wall
mounted
Standard
SJ AMNW07GSJA0 USNW09GJ3A0 USNW12GJ3A0
SK USNW18GK3A0 AMNW24GSKA0
Standard
Plus
SJ
AMNW05GSJB0
ZMNW05GSJC0
AMNW07GSJB0
ZMNW07GSJC0
USNW09GJ2F0
ZMNW09GSJC0
USNW12GJ2F0
ZMNW12GSJC0
AMNW15GSJB0
ZMNW15GSJC0
SK
USNW18GK2F0
ZMNW18GSKC0
USNW24GK2F0
ZMNW24GSKC0
Deluxe
SJ AMNW07GSJL0 ASNW09GJ1Z0 ASNW12GJ1Z0
SK ASNW18GK1Z0 ASNW24GK1Z0
Standard
SJ AMNW07GSJR0 USNW09GJRZ0 USNW12GJRZ0
SK USNW18GKRZ0 AMNW24GSKR0
ART
COOL Gallary SF
ZMNW09GAF10
[MA09R NF1]
ZMNW12GAF10
[MA12R NF1]
Ceiling
Cassette
1-Way TU
ZMNW09GTUA0
[MT09R NU1]
ZMNW12GTUA0
[MT11R NU1]
4-Way
TR
ZMNW05GTRA0
[MT06R NR0]
ZMNW07GTRA0
[MT08R NR0]
ZTNW09GRLA0
[CT09R NR0]
ZTNW12GRLA0
[CT12R NR0]
TQ
ZTNW18GQLA0
[CT18R NQ0]
TP
ZTNW24GPLA0
[CT24R NP0]
Ceiling & Floor
VE
AVNH09GELA2
[CV09 NE2]
AVNH12GELA2
[CV12 NE2]
VJ
UVNH18GJLA2
[CV18 NJ2]
UVNH24GJLA2
[CV24 NJ2]

Part 1 General Information
- 13 -
Copyright © 2016 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Category Type Chassis
Model names
Capacity, kW(kBtu/h)
1.5
(5)
2.1
(7)
2.5
(9)
3.5
(12)
4.2
(15)
5.0
(18)
7.1
(24)
Ceiling
Concealed
Duct
High
Static
Pressure M1
ZBNW18GM1A0
[CM18R N10]
ZBNW24GM1A0
[CM24R N10]
Low
Static
Pressure
L1 ABNH09GL1A*
L2 ZBNW09GL2A0 AMNW12GL2A*
ZBNW12GL2A0
AMNW18GL2A*
ZBNW18GL2A0
L3
AMNW24GL3A*
ZBNW24GL3A0
Console QA
AQNH09GALA0
[CQ09 NA0]
AQNH2GALA0
[CQ12 NA0]
AQNH18GALA0
[CQ18 NA0]

- 14 -
Copyright © 2016 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Part 1 General Information
2.2 Outdoor units
(1 phase)
Heat pump A2UW14GFA2 [MU2M15 UL4]
Z2UW14GFA0 [MU2R15 UL0]
A2UW16GFA2 [MU2M17 UL4]
Z2UW16GFA0 [MU2R17 UL0]
No.of connectable indoor units Max.2
Total capacity index of connectable
indoor units
kW 6.15 7.03
kBtu/h 21 24
Power supply 1 Ø, 220-240 V, 50 Hz
Chassis
Heat pump A3UW18GFA2 [MU3M19 UE4]
Z3UW18GFA0 [MU3R19 UE0]
A3UW18GFA2 [MU3M19 UE4]
Z3UW21GFA0 [MU2R21 UE0]
No.of connectable indoor units Max.3
Total capacity index of connectable
indoor units
kW 8.79 9.67
kBtu/h 30 33
Power supply 1 Ø, 220-240 V, 50 Hz
Chassis
Heat pump A4UW24GFA2 [MU4M25 U44]
Z4UW24GFA0 [MU4R25 U40]
A4UW24GFA2 [MU4M25 U44]
Z3UW21GFA0 [MU2R21 UE0]
No.of connectable indoor units Max.4
Total capacity index of connectable
indoor units
kW 11.4 12
kBtu/h 39 41
Power supply 1 Ø, 220-240 V, 50 Hz
Chassis
Heat pump Z4UW24GFA1
[MU4R25 U21]
Z3UW21GFA1
[MU3R21 U21]
Z3UW18GFA1
[MU3R19 U21]
No.of connectable indoor units Max.4 Max.3
Total capacity index of connectable
indoor units
kW 11.4 9.7 8.8
kBtu/h 39 33 30
Power supply 1 Ø, 220-240 V, 50 Hz
Chassis

- 15 -
Copyright © 2016 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Part 1 General Information
Heat pump A5UW30GFA2 [MU5M30 U44]
Z5UW30GFA0 [MU5R30 U40] A5UW40GFA1 [MU5M40 U44]
No.of connectable indoor units Max.5
Total capacity index of connectable
indoor units
kW 14.1 21.1
kBtu/h 48 72
Power supply 1 Ø, 220-240 V, 50 Hz
Chassis
(1 phase)
Heat pump A7UW40GFA0
[FM40AH U42]
A8UW48GFA0
[FM48AH U32]
A9UW56GFA0
[FM56AH U32]
No.of connectable indoor units Max.7 Max.8 Max.9
Total capacity index of connectable
indoor units
kW 15.2 18.5 21.4
kBtu/h 52 63 73
Power supply 1 Ø, 220-240 V, 50 Hz
Chassis
Heat pump A7UW42GFA1
[FM40AH U34]
A8UW48GFA1
[FM48AH U34]
A9UW56GFA1
[FM56AH U34]
No.of connectable indoor units Max.7 Max.8 Max.9
Total capacity index of connectable
indoor units
kW 21.1 22.3 24.6
kBtu/h 72 78 84
Power supply 1 Ø, 220-240 V, 50 Hz
Chassis

5. Trouble Shooting
- 16 -
Copyright © 2016 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
(3 phase)
Heat pump A7UW42LFA0
[FM41AH U32]
A8UW48LFA0
[FM49AH U32]
A9UW56LFA0
[FM54AH U32]
No.of connectable indoor units Max.7 Max.8 Max.9
Total capacity index of connectable
indoor units
kW 15.8 18.5 21.4
kBtu/h 54 63 73
Power supply 3 Ø, 380-415 V, 50 Hz
Chassis
(3 phase)
Heat pump A7UW42LFA1
[FM41AH U34]
A8UW48LFA1
[FM49AH U34]
A9UW56LFA1
[FM57AH U34]
No.of connectable indoor units Max.7 Max.8 Max.9
Total capacity index of connectable
indoor units
kW 21.1 22.6 24.6
kBtu/h 72 78 84
Power supply 3 Ø, 380-415 V, 50 Hz
Chassis

5. Trouble Shooting
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Copyright © 2016 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
2.3 BD(Branch distributor) units
No. of connectable indoor units
Max. 2 Max. 3 Max. 4
Model name PMBD3620 PMBD3630 PMBD3640
Connectable indoor unit capacity kW 1.5~7.0 1.5~7.0 1.5~7.0
kBtu/h 5~24 5~24 5~24
BD unit

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Copyright © 2016 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Part 1 General Information
3. Nomenclature
3.1 Indoor Unit(Global)
AMN W G07 BRL0
Serial number
A4U W G24 F A 0
Electrical rating
A*N, Z*N, U*N, E*N, S*N : Indicates that this is multi system indoor unit
Model type
H : Heat pump
W : DC Inverter heat pump
Ex) 7,000 Btu/h Class →'07', 18,000 Btu/h Class →'18'
Cooling/heating capacity
Electrical rating
G: 1ø, 220-240V, 50Hz/60Hz
L : 3ø, 380-415V, 50/60Hz
Chassis naem(Only Multi)
Indoor unit type(Only Multi)
S : Wall Mounted
T : Ceiling Cassette
A : ART COOL Mirror
Chassis name(Common Indoor)
Function / Indoor unit type
A , B, C : Basic / L , R : Ionizer
Indicates that this is multi system outdoor unit using R410A
Ex) A4U : Connectable max. 4 indoor units
A9U : Connectable max. 9 indoor units
Model type
W : DC inverter heat pump
Ex) 24,000 Btu/h Class →'24', 48,000 Btu/h Class →'48'
Cooling/heating capacity
G:1ø, 220-240V, 50/60Hz
L: 3ø, 380-415V, 50/60Hz
Multi type
Function
A : Basic
F : Free joint multi type
Serial number
3.2 Outdoor Unit(Global)

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Copyright © 2016 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Part 1 General Information
3.3 Indoor Unit(Europe)
Serial number
Indoor Unit / Outdoor Units
Detailed product type only
for M- series models
Nominal Capacity
Ex) 7,000 Btu/h Class →'07',
18,000 Btu/h Class →'18'
Product type
Chassis name
SQSM N B 015
AM,PM,PC,DM,DC,MJ,P,S : Wall mounted / ARTCOOL mirror
MA : ARTCOOL
MT,CT: Ceiling Cassette
CB,CM : Ceiling Concealed Duct
CV : Ceiling Suspended & floor
CQ : Console
N : Indoor Unit
U : Outdoor Unit