LG MULTI V LRNN-BE Series User manual

System
Heat Pump Indoor Unit
INSTALLATION MANUAL
LG
MODELS: LRNN, LRNV-BE/BG/BH Series
Type: Ceiling Concealed Duct - High Static
website http://www.lgservice.com
IMPORTANT
• Please read this installation manual completely before
installing the product.
• Installation work must be performed in accordance with
the national wiring standards by authorized personnel
only.
• Please retain this installation manual for future reference
after reading it thoroughly.

2Indoor Unit
Ceiling Concealed Duct - Low Static Type Indoor Unit Installation Manual
TABLE OF CONTENTS
❏Installation guide map
❏Four type "A" screws & plastic
anchors
❏Connecting cable
❏Pipes: Gas side
Liquid side
(Refer to Product Data)
❏Insulation materials
❏Additional drain pipe
❏Twotype"B"screws
❏Level gauge
❏Screw driver
❏Electric drill
❏Hole core drill
❏Horizontal meter
❏Flaring tool set
❏Specified torque wrenches
(different depending on model No.)
❏Spanner .......Half union
❏A glass of water
❏Screw driver
❏Hexagonal wrench
❏Gas-leak detector
❏Vacuum pump
❏Gauge manifold
❏Owner's manual
❏Thermometer
Installation Parts Provided....3
Safety Precautions .................4
Installation
Selection the best location ....7
Ceiling opening dimension
and hanging bolt location ......8
Wiring Connection .................9
Check the Drainage.............10
Installation of Remote
Control..................................13
Drain Pipe Work...................14
Installation of Drain Pump ...16
Optional Operation ..............18
Installation Requirements Required Parts Required Tools

Installation Manual 3
Installation Parts Provided
3
Air filters
Remote Controller
Air intake vents
Air outlet vents
Installation
Name
Quantity
Shape for gas pipe
for liquid pipe
Clamp metal
1 EA
Insulation for
fitting
1 set 1 set
Drain hose
1 EA
(Other)
Clamp
6 EA
Screws for
duct flanges
• Owner's manual
• Installation manual
• Washers(8 pcs.)

4Indoor Unit
Safety Precautions
Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions must be followed.
■Be sure to read before installing the air conditioner.
■Be sure to observe the cautions specified here as they include important items related to safety.
■Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the
following indications.
■Meanings of symbols used in this manual are as shown below.
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to properties only.
Be sure not to do.
Be sure to follow the instruction.
■Installation
Do not use a defective or under-
rated circuit breaker. Use this
appliance on a dedicated circuit.
•Thereisriskoffireorelectricshock.
For electrical work, contact the
dealer, seller, a qualified electri-
cian, or an Authorized Service
Center.
• Do not disassemble or repair the
product. There is risk of fire or elec-
tric shock.
Always ground the product.
•Thereisriskoffireorelectricshock.
Install the panel and the cover
of control box securely.
•Thereisriskoffireorelectricshock.
Always install a dedicated cir-
cuit and breaker.
• Improper wiring or installation may
cause fire or electric shock
Use the correctly rated breaker
or fuse.
•Thereisriskoffireorelectricshock.

Installation Manual 5
Safety Precautions
■Operation
Do not modify or extend the
power cable.
• There is risk of fire or electric shock.
Do not let the air conditioner
run for a long time when the
humidity is very high and a door
or a window is left open.
• Moisture may condense and wet or
damage furniture.
Be cautious when unpacking
and installing the product.
• Sharp edges could cause injury. Be
especially careful of the case edges
and the fins on the condenser and
evaporator.
For installation, always contact
the dealer or an Authorized
Service Center.
• There is risk of fire, electric shock,
explosion, or injury.
Do not install the product on a
defective installation stand.
• It may cause injury, accident, or
damage to the product.
Be sure the installation area
does not deteriorate with age.
• If the base collapses, the air condi-
tioner could fall with it, causing prop-
erty damage, product failure, and
personal injury.
Do not store or use flammable gas or combustibles near the product.
• There is risk of fire or failure of product.
Gasolin

6Indoor Unit
Safety Precautions
Always check for gas (refriger-
ant) leakage after installation or
repair of product.
• Low refrigerant levels may cause
failure of product.
Install the drain hose to ensure
that water is drained away prop-
erly.
• A bad connection may cause water
leakage.
Keep level even when installing
the product.
• To avoid vibration or water leakage.
Do not install the product where
the noise or hot air from the out-
door unit could damage the
neighborhoods.
• It may cause a problem for your
neighbors.
Use two or more people to lift
and transport the product.
• Avoid personal injury.
Do not install the product where
it will be exposed to sea wind
(salt spray) directly.
• It may cause corrosion on the product.
Corrosion, particularly on the con-
denser and evaporator fins, could
cause product malfunction or inefficient
operation.
90˚
■Installation

Installation Manual 7
Installation
Install the air conditioner in the location that satisfies the following conditions.
•The place shall easily bear a load exceeding four times the indoor unit’s weight.
•The place shall be able to inspect the unit as the figure.
•The place where the unit shall be leveled.
•The place shall allow easy water drainage.(Suitable dimension “H”is necessary to get a slope to drain as
figure.)
•The place shall easily connect with the outdoor unit.
•The place where the unit is not affected by an electrical noise.
•The place where air circulation in the room will be good .
•There should not be any heat source or steam near the unit.
Read completely, then follow step by step.
Top view
(unit: mm)
H
Front view
600600
Front
Inspection hole
(600X600)
Control box
1000
Installation
Selection of the best location
CAUTION : In case that the unit is installed near the sea, the installation parts
may be corroded by salt, The installation parts (and the unit) should be taken
appropriate anti-corrosion measures.

8Indoor Unit
Installation
■Installation of Unit
Install the unit above the ceiling correctly.
•Apply a joint-canvas between the unit and duct to absorb
unnecessary vibration.
•Install the unit leaning to a drainage hole side as a figure
for easy water drainage.
•A place where the unit will be leveled and that can sup-
port the weight of the unit.
•A place where the unit can withstand its vibration.
•A place where service can be easily performed.
CASE 1
POSITION OF SUSPENSION BOLT
CASE 2
POSITION OF CONSOLE BOLT
(Unit:mm)
Drainage hole
M10 Nut
M10 SP. washer
M10 washer
X 4
X 4 (Local
supply)
X 4
M10 Nut
M10 SP. washer
M10 washer
X 4
X 4 (Local
supply)
X 4
A
B
C
1-3 mm D
(G)
H
I
EF
•Throughly study the following installation locations:
1. In such places as restaurants and kitchens, considerable amount of oil steam and flour adhere to the fan, the fin of the
heat exchanger, resulting in heat exchange reduction, spraying, dispersing of water drops, etc.
In these cases, take the following actions:
•Make sure that the ventilation fan for smoke-collecting hood on a cooking table has sufficient capacity so that it draws oily
steam which should not flow into the suction of the air conditioner.
•Make enough distance from a cooking room to install the air conditioner in such a place where it may not suck in oil
steam.
2. Avoid installing air conditioner in such circumstances where cutting oil mist or iron powder is in suspension in factories, etc.
3. Avoid places where inflammable gas is generated, flows in, is stored or vented.
4. Avoid places where sulfurous acid gas or corrosive gas is generated.
5. Avoid places near high frequency generators.
NOTICE
ABCDEF(G)H
186/246BH 932 882 355 45.5 450 30 87 750
286/366/426BG 1232 1182 355 45.5 450 30 87 830
426/486BE 1292 1230 570.5 54 680 30 120 1006
Dimension
Capacity
[kW(Btu/h)]
Ceiling dimension and hanging bolt location

Installation Manual 9
Installation
•Select and mark the position for fixing bolts.
•Drill the hole for set anchor on the face of ceiling.
•Insert the set anchor and washer onto the suspen-
sion bolts for locking the suspension bolts on the
ceiling.
• Mount the suspension bolts to the set anchor firmly.
•Secure the installation plates onto the suspension
bolts (adjust level roughly) using nuts, washers
and spring washers.
1 Set anchor
Old building New building
2 Plate washer
3 Spring washer
4 Nut
5 Suspension
bolts
Connect the wires to the terminals on the control board individually according to the outdoor unit connection.
•Ensure that the color of the wires of outdoor unit and the terminal No. are the same as those of indoor unit respectively
Clamping of cables
1) Arrange 2 power cables on the control panel.
2) First, fasten the steel clamp with a screw to the inner boss of control panel.
3) For the cooling model, fix the other side of the clamp with a screw strongly. For the heat pump model, put the
0.75mm2cable(thinner cable) on the clamp and tighten it with a plastic clamp to the other boss of the control
panel.
4) In Australia, the length of power supply cord measured from the entry of the power supply cord to the middle of
live pin on the power plug should be over 1.8m.
Terminal Block in Indoor
1(L) 2(N) 3 4
INDOOR POWER INPUT
Terminal Block in Outdoor
ABC D Vcc
Wiring Connection
CAUTION : Tighten the nut and bolt
to prevent unit falling.
WARNING : Make sure that the screws of the terminal are free from looseness.

10 Indoor Unit
Installation
All thermal insulation must comply with local requirement.
THERMAL INSULATION
Make sure that there is no clearance here.
Overlap with thermal
insulator for piping.
Thermal insulator for refrigerant pipe
(Local supply) Thermal insulator for
piping(Local supply)
Hose crip for thermal insulator(Local supply)
Union for liquid pipe
Refrigerant pipe and thermal
insulator(Local supply)
Union for gas pipe
Thermal insulator for refrigerant pipe
(Local supply)
Hose crip for thermal insulator
(Local supply)
1. Remove the Air Filter.
2. Check the drainage.
•Spray one or two glasses of water upon the
evaporator.
•Ensure that water flows drain hose of indoor
unit without any leakage.
Checking the Drainage

Installation Manual 11
Installation
Ceiling
CAUTION
1~3mm
Drainage hole
Drainage hole
U-Trap
B
C
A ≥70mm
B ≥2C
C ≥2 x SP
SP = External Pressure
(mmAq)
Ex) External Pressure
= 10mmAq
A ≥70mm
B ≥40mm
C ≥20mm
A
Make sure to be closed.
Unit
Drainage pipe
(Local supply)
Thermal insulator
(Local supply)
Drainage hole
CAUTION FOR GRADIENT OF
UNIT AND DRAIN PIPING
Lay the drain hose with a downware
inclination so water will drain out.
Front of view
•Alway lay the drain with downward inclination
(1/50 to 1/100).
Prevent any upward flow or reverse flow in any
part.
•5mm or thicker formed thermal insulator shall
always be provided for the drain pipe.
CORRECT
•Install the P-Trap (or U-Trap) to prevent
a water leakage caused by the blocking
of intake air filter.
Applied U-Trap Dimension
1. Install declination of the indoor unit is very important for the drain of the duct type air conditioner.
2. Minimum thickness of the insulation for the connecting pipe shall be 5mm.
•The unit must be horizontal or declined to the drain hose connected when finished
installation.
CORRECT
INCORRECT
INCORRECT
•Upward routing not
allowed

12 Indoor Unit
Installation
CAUTION:
After the confirmation of the above conditions, prepare the wiring as follows:
1) Never fail to have an individual power specialized for the air conditioner. As for the method
of wiring, be guided by the circuit diagram pasted on the inside of control box cover.
2) Provide a circuit breaker switch between power source and the unit.
3) The screw which fasten the wiring in the casing of electrical fittings are liable to come
loose from vibrations to which the unit is subjected during the course of transportation.
Check them and make sure that they are all tightly fastened. (If they are loose, it could
give rise to burn-out of the wires.)
4) Specification of power source
5) Confirm that electrical capacity is sufficient.
6) Be sure that the starting voltage is maintained at more than 90 percent of the rated voltage
marked on the name plate.
7) Confirm that the cable thickness is as specified in the power sources specification.
(Particularly note the relation between cable length and thickness.)
8) Never fail to equip a leakage breaker where it is wet or moist.
9) The following troubles would be caused by voltage drop-down.
•Vibration of a magnetic switch, damage on the contact point there of, fuse breaking, dis-
turbance to the normal function of a overload protection device.
•Proper starting power is not given to the compressor.
HAND OVER
Teach the customer the operation and maintenance procedures, using the operation manual.
(air filter cleaning, temperature control, etc.)

Installation Manual 13
Installation
Remote control
box body
Cord clamp
(accessory)
Lever carefully
the box open
using a screw
driver, etc.
Front case
The lower part
Face of wall
Under plate
Screw (accessory)
•Separate the under plate from Remote
control box.
•Attach insulator to under plate.
•Fix the under plate on the wall
• Fix the cord clamps on the wall by ø3 tapping screws (accessory).
• Fix the remote control cord.
WIRED REMOTE CONTROL INSTALLATION
DISASSEMBLING
ELECTRICAL WIRING
Wire and make sure that teminal
numbers are matched on unit side and
remote control side.
The maximum length of the cord is 100m.
If the length of the cord exceeds 50m,
use a wire size greater than 0.5mm2.
Remote control
(Main board)
CN REMO
•Although the room themperature sensor is in the indoor unit, the remote control should be installed in such
places away from direct sunlight and high humidity.
Installation of the remote control
•Select places that are not splashed with water.
•Select control position after receiving customer approval.
•The room temperature sensor is built in the indoor unit.
•This remote control equipped with liquid crystal display. If this position is higher or lower, display is difficult to
see.(The standard height is 1.2 ~1.5m high)
Routing of the remote control cord
•Keep the remote control cord away from the refrigerant piping and the drain piping.
•To protect the remote control cord from electrical noise, place the cord at least 5cm away from other power
cables (audio equipment. television set, etc.)
•If the remote control cord is secured to the wall, provide a trap at the top of the cord to prevent water droplets
from running.
CAUTION : Use the wireless remote control with the wired.
If you want to use wireless alone, you should do following process.
1) Do auto addressing in connecting the wired.
2) After compelting auto addressing, turn off the power and disconnect the wired.
Installation of Remote Control

14 Indoor Unit
Installation
1) Drain pipe gradient and support
a) - The drain pipe must be fitted at a gradient of at least 1/100.
- The drain pipe should be as short as possible and free from airlocks.
2) Drain trap
Fit any indoor unit whose drain pipe connection is subjected to negative pressure, with a drain trap.
a) Rig the drain trap shown in the drawing below.
b) Provide one trap per unit. A single trap for converging units will prove ineffective.
c) Rig the trap to allow for future changing.
b) - Suspension bolts should be used th support long stretches of drain pipe in order to ensure that a
gradient of 1/100 is maintained (PVC pipe should not be bent)
Spacing of supports for horizontal piping
c) - The length of pipe laid horizontally should be kept a minimum.
Gradient of least 1 / 100
(1cm / 1m)
Indoor unit
Indoor unit
H
H
Indoor unit
Plug
Indoor unit
Plug
Class Norminal diameter Spacing
Rigid PVC pipe 25~40mm 1.0m or less
DrainPipeWork

Installation Manual 15
Installation
Installation of Ceiling Concealed Duct(Low-Static) Type Indoor Unit
3) Ground drain piping
a) It is standard work practice to make connections to the main pipe from above. The pipe down from the
combination should be as large as possible.
4) Use of an auxiliary drain hose(flexible)
a) It the drain pan made of polystyrene foam is used then an auxiliary drain hose(flexible) is also essential a
flexible drain hose permits the drain socket and drain pipe to be connected without difficulty and prevents
any undue strain being placed on he drain pan.
❈Important points
- The drain pipe should be at least equal in size to that of the indoor unit.
- The drain pipe is thermally insulated to prevent the formation of condensation inside the pipe.
- The drain up mechanism should be fitted before the indoor unit is installed and when the electricity has
been connected some water should be added to the drain pan and the drain pump check to see that it is
functioning correctly.
- Al connections should be secure. (Special care is needed with PVC pipe)
- Insulate auxiliary drain hose with thermal insulation band.
b) The pipe work should be kept as short as possible and he number of indoor units per group kept to a
minimum.
Face piping
downward
Vent pipe
Face the vent pipe mouth downward to keep
foreign matter from penetrating the system
Metal clamp
Drain pan Metal clamp
Thermal insulation(bend area)
Auxiliary drain hose Thermal insulation (drain pipe area)

16 Indoor Unit
Installation
1) Safety First
•Cut off the power supply before installation and maintenance.
•Drain Pump Assy, Elbow and Hose must be installed at safe area where it is far away from the user.
•Drain Pump Assy must be installed at appointed location.
•All wiring and connections are for installation only.
2
1
2) Quantity
Quantity Package contents
1 Drain Pump Assy(AC220~240V, 50/60Hz, 400cm3/min)
1 Elbow(ø32mm)
1 Hose
2 Tie Wrap
10 Screw
1 Rubber
1 Installation manual
3) Service Parts List
No. Location No. P/No. Description Remark
1 158590 5858A10001L Pump Water
2 266012 6601A20001E Switch Assy, Float
Installation of drain pump

Installation Manual 17
Installation
5) Attention
1. Possible drain-head height is up to 700mm. So, it
must be installed below 700mm.
2. Keep the drain hose downward up to 1/50~1/100
inclination.
Prevent any upward flow or reverse flow in any
part.
3. 5mm or thicker formed thermal insulator is provid-
ed for the drain pipe.
4. Upward routing is not allowed.
5. Be sure to check the drain pump for normal opera-
tion and abnormal noise when electrical wiring is
complete.
MAX 700mm
Drain Pipe
Drain Pump
1/50~1/1001/50~1/100
Elbow
Drain pump
Unit
Drain pipe
(Local supply)
Thermal insulator
(Local supply)
1/50~1/100
Wall
Drain hose
1/50~1/100

18 Indoor Unit
Installation
You can choose the RPM(or air volume) of indoor
motor according to the height of ceiling to supply the
comfortable atmosphere to consumers.
Procedure
1. Choose the selectable position in the table after
measuring the height of ceiling.
2. In the case of changing the height as "high" or "low",
open the rear cover of the wired remote-control.
3. Move the slide switch to the set position.
4. Close the rear cover and check if it works nomally.
2) Adjusting air volume to the height of ceiling
TH
R14H
SW TH
REMO
MAIN
2TH OP7
R18H
R17H
OP6
LO
STAND
SW HIGH
HI R03S
C070 R04S R02S
R01S
OP3 OP2 OP1
R19H
R11H
R13H R12H OP5R16H OP4
R15H
CO1H
Lo
Hi
STAND
Slide switch for ceiling height
Slide switch for 2 Thermistor
Standard
(Default)
Low ceiling
High Ceiling
Ceiling height Mode of slide switch Change of air volume Remark
more than 4.0m High Ceiling Increasing
3.2~4.0m Standard -
less than 3.2m Low Ceiling Decreasing
Maunfactured in stan-
dard mode
1) Two Thermistor System
(1) Open the rear cover of the wired remote-control to set
the mode.
(2) Select one of three selectable modes as follows.
•Position 1:
The room temperature is controlled by the thermistor
of the main body.
•Position 2:
The room themperature is controlled by the thermis-
tor of the wired remote-control, control the tempera-
ture according to the position of wired remote-con-
trol.
•Position 3:
The room temperature is controlled by lower temper-
ature between the temperature of main body and of
remote-control sensor.
(3) Move the slide switch to set position.
(4) Close the rear cover and check if it works normally.
TH
R14H
SW TH
REMO
MAIN
2TH OP7
R18H
R17H
OP6
LO
STAND
SW HIGH
HI R03S
C070 R04S R02S
R01S
OP3 OP2 OP1
R19H
R11H
R13H R12H OP5R16H OP4
R15H
CO1H
REMO
Room Temp. sensor
2TH
MAIN
Position 2
Position 1
Position 3
Slide switch for ceiling height
Slide switch for 2 Thermistor
Optional operation
CAUTION :
•Select the position after counselling with a customer.
In case of cooling mode, room temperature is controlled by the main body sensor.
•To control the room temperature by a wired remote control, install control(room
temp. sensor) to sense the temperature more accurately.
•Maunfactured in the position 3.

P/No.: 3828A23004B Printed in Korea
After reading this manual, keep it in a place easily accessible to the user for future reference.