Multi Type
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.
INSTALLATION MANUAL
AIR
CONDITIONER
MFL68280104
Rev.01_083018
www.lg.com
www.lghvac.com
Copyright © 2017 - 2018 LG Electronics Inc. All Rights Reserved.
ENGLISH FRANÇAIS ESPAÑOL
FLEX MULTI SPLIT INSTALLATION
INSTRUCTIONS
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, explosionor death.
Installation Manual 3
Multi Air Conditioner Installation Manual
TABLE OF CONTENTS
Installation Parts Provided ...................................................4
Safety Precautions ................................................................5
Installation of Indoor, Outdoor Unit .....................................8
Select the best location ....................................................8
Seaside Applications and Installation ..............................10
Seasonal Wind And Cautions In Winter...........................11
Piping length and elevation .............................................12
Installation............................................................................14
Connecting the piping......................................................14
How To Fix.......................................................................18
Wiring Connection ...........................................................19
Conduit connection..........................................................19
Ceiling dimension and hanging bolt location ...................20
How to Fix .......................................................................21
Wiring Connection ...........................................................21
Conduit connection..........................................................21
Installation of Wired Remote Controller(Optional)...........22
Installation of Decorative Panel.......................................24
Drain Piping.....................................................................26
Flaring Work and Connection of Piping ............................29
Flaring work.....................................................................29
Connection of piping - Outdoor .......................................30
Installation .......................................................................33
Installation of The Main Unit............................................34
Connecting the Cable between Indoor Unit, Distributor
Unit and Outdoor Unit .........................................................35
Connect the cable to the Indoor unit. ..............................35
Connect the cable to the Distributor unit. ........................36
Connect the cable to the Outdoor unit.............................38
Connection method of the connecting cable(Example)...40
Checking the Drainage, Insulating the Pipe and Special
Piping Applications .............................................................41
Checking the drainage ....................................................41
Insulating the Pipe and Special Piping Applications........41
Air Purging and Evacuation................................................42
Leak Checking.................................................................42
Evacuation.......................................................................43
Charging ...............................................................................44
Installation PI485 .................................................................46
Test Running ........................................................................47
Function................................................................................48
DIP S/W Setting ..............................................................48
Forced Cooling Operation ...............................................49
Wiring Error Check ..........................................................50
Saving Power Consumption ............................................50
Night Quiet Mode ............................................................51
Mode Lock.......................................................................52
Pcb Display(18/24k Model Only) .....................................53
Max Combination Capacity.................................................54
o Level gauge
o Screw driver
o Electric drill
o Hole core drill (ø50mm)
o Flaring tool set
o Specified torque wrenches
1.8kg.m, 4.2kg.m, 5.5kg.m, 6.6kg.m
(different depending on model No.)
o Adjustable wrench
o A glass of water
o Screw driver
o Hexagonal wrench(4mm)
o Refrigerant Gas Leak Detector
o Vacuum pump
o Gauge manifold
o Owner's manual
o Thermometer
o Remote Control Holder
Installation Requirements
Required Tools
ENGLISH
4 Multi Air Conditioner
Installation Parts Provided
Installation Parts Provided
[Wall mounted / ART COOL Mirror]
[Ceiling Concealed Duct Type]
[Ceiling Cassette Type]
Type "A" screw Type "A" screw
Type "B" screw Type "B" screw
Remote control holderRemote control holder
Type 1 Type 2
Installation plate Installation plate
Type “A” screw Type “A” screw
Type "B" screw Type "C" screw Type "B" screw Type "C" screw
Remote control holderRemote control holder
Type 3 Type 4
Installation plate Installation plate
Name
Quantity
Shape
for gas pipe
for liquid pipe
Clamp metal
1 EA
Insulation for
fitting
1 set
Clamp
8 EA
Screws for
duct flanges
1 set
Conduit Bracket
Screw(M4) 2EA
Conduit
Bracket
1 EA
Name
Quantity
Shape
for gas pipe
Conduit Bracket
Screw(M4) 2EA
for liquid pipe
Clamp metal
1 EA
Insulation for Remote
control holder
fitting
1 SET 1 EA
Drain hose
1 EA
Clamp
Conduit
Bracket
8 EA
Washer for
hanging backet
8 EA 1 EA
Installation Manual 5
Product Introduction
ENGLISH
To prevent the injury of the user or other people and property damage, the following instructions
must be followed.
n Be sure to read before installing the air conditioner.
n Be sure to observe the cautions specified here as they include important items related to safety.
n Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is
classified by the following indications.
n The meanings of the symbols used in this manual are as shown below.
WARNING
CAUTION
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to properties only.
WARNING
Be sure not to do.
Be sure to follow the instruction.
Safety Precautions
Installation
• Always perform grounding.
- Otherwise, it may cause electrical shock.
• Don’t use a power cord, a plug or a loose socket which is damaged.
- Otherwise, it may cause a fire or electrical shock.
• For installation of the product, always contact the service center or a professional installation
agency.
- Otherwise, it may cause a fire, electrical shock, explosion or injury.
• Securely attach the electrical part cover to the indoor unit and the service panel to the outdoor
unit.
- If the electrical part cover of the indoor unit and the service panel of the outdoor unit are not
attached securely, it could result in a fire or electric shock due to dust, water, etc.
• Always install an air leakage breaker and a dedicated switching board.
- No installation may cause a fire and electrical shock.
• Do not keep or use flammable gases or combustibles near the air conditioner.
- Otherwise, it may cause a fire or the failure of product.
• Ensure that an installation frame of the outdoor unit is not damaged due to use for a long time.
- It may cause injury or an accident.
• Do not disassemble or repair the product randomly.
- It will cause a fire or electrical shock.
h The figure can be changed according to model.
• Do not install the product at a place that there is concern of falling down.
- Otherwise, it may result in personal injury.
6 Multi Air Conditioner
Safety Precautions
• Use caution when unpacking and installing.
- Sharp edges may cause injury.
• 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.
Operation
• Do not share the outlet with other appliances.
- It will cause an electric shock or a fire due to heat generation.
• Do not use the damaged power cord.
- Otherwise, it may cause a fire or electrical shock.
• Do not modify or extend the power cord randomly.
- Otherwise, it may cause a fire or electrical shock.
• Take care so that the power cord may not be pulled during operation.
- Otherwise, it may cause a fire or electrical shock.
• Unplug the unit if strange sounds, smell, or smoke comes from it.
- Otherwise, it may cause electrical shock or a fire.
• Keep the flames away.
- Otherwise, it may cause a fire.
• Take the power plug out if necessary, holding the head of the plug and do not touch it with wet
hands.
- Otherwise, it may cause a fire or electrical shock.
• Do not use the power cord near the heating tools.
- Otherwise, it may cause a fire and electrical shock.
• Do not open the suction inlet of the indoor/outdoor unit during operation.
- Otherwise, it may electrical shock and failure.
• Do not allow water to run into electrical parts.
- Otherwise, it may cause the failure of machine or electrical shock.
• Hold the plug by the head when taking it out.
- It may cause electric shock and damage.
• Never touch the metal parts of the unit when removing the filter.
- They are sharp and may cause injury.
• Do not step on the indoor/outdoor unit and do not put anything on it.
- It may cause an injury through dropping of the unit or falling down.
• Do not place a heavy object on the power cord.
- Otherwise, it may cause a fire or electrical shock.
• When the product is submerged into water, always contact the service center.
- Otherwise, it may cause a fire or electrical shock.
• Take care so that children may not step on the outdoor unit.
- Otherwise, children may be seriously injured due to falling down.
Installation Manual 7
Safety Precautions
ENGLISH
CAUTION
Installation
• Install the drain hose to ensure that drain can be securely done.
- Otherwise, it may cause water leakage.
• Install the product so that the noise or hot wind from the outdoor unit may not cause any damage
to the neighbors.
- Otherwise, it may cause dispute with the neighbors.
• Always inspect gas leakage after the installation and repair of product.
- Otherwise, it may cause the failure of product.
• Keep level parallel in installing the product.
- Otherwise, it may cause vibration or water leakage.
Operation
• Avoid excessive cooling and perform ventilation sometimes.
- Otherwise, it may do harm to your health.
• Use a soft cloth to clean. Do not use wax, thinner, or a strong detergent.
- The appearance of the air conditioner may deteriorate, change color, or develop surface flaws.
• Do not use an appliance for special purposes such as preserving animals vegetables, precision
machine, or art articles.
- Otherwise, it may damage your properties.
• Do not place obstacles around the flow inlet or outlet.
- Otherwise, it may cause the failure of appliance or an accident.
8 Multi Air Conditioner
Safety Precautions
Installation of Indoor, Outdoor Unit
Read completely, then follow step by step.
Indoor unit
1. Do not have any heat or steam near the unit.
2. Select a place where there are no obstacles in
front of the unit.
3. Make sure that condensation drainage can be
conveniently routed away.
4. Do not install near a doorway.
5. Ensure the unit is unobstructed, allow proper
space on all sides according to the arrows and
distance measurements in the figures.
6.
Use a Metal Detector or Metal Scanner to locate
studs to prevent unnecessary damage to the wall.
Select the best location
Top view
Front view
H=20(25/32) or more
Service Space
Ceiling
A
B
Capacity(Btu/h class)
AB
9,12k 600(23-5/8) 900(35-7/16)
18k 600(23-5/8) 1100(43-5/16)
Unit:mm(inch)
[Ceiling Concealed Duct Type] [Ceiling Cassette Type]
[ART COOL Gallery]
* Suitable dimention “H” is necessary to get a slope to
drain as show in the figure.
600
(23-5/8)
600
(23-5/8)
Inspection hole
[600(23-5/8) x 600(23-5/8)]
Control box
Ceiling
Ceiling Board
Ceiling Board
Floor
Unit:mm(inch)
At least 1800(70-
7
/
8
)
3600(141-
23
/
32
) or less
1000(39-
3
/
8
)
or more
500(19-
11
/
16
)
or more
10(
13
/
32
)
or more
500(19-
11
/
16
)
or more
300(11-
13
/
16
) or less
30(1-3/16)
±3(1/8)
More than
200(7-87/100)
More than
500(19-11/16)
More than
1500(59-11/200)
More than
500(19-11/16)
More than 200(7-7/8)
Recommended height
2000(78-3/4)
More than
100(3-15/16)
More than
100(3-15/16)
Unit:mm(inch)
[Wall mounted / ART COOL Mirror]
❈
Note : remove obstructions to prevent blockage of airflow path
Installation Manual 9
Installation of Indoor, Outdoor Unit
ENGLISH
Outdoor unit
1. If an awning is built over the unit to prevent
direct sunlight or rain exposure, make sure
that heat radiation from the condenser is not
restricted.
2. Ensure the unit is unobstructed, allow proper
space on all sides according to the arrows
and distance measurements in the figures.
3. Do not place animals and plants in the path of
the warm air.
4. Take the air conditioner weight into account
and select a place where noise and vibration
are minimum.
5.
Select a place so that the warm air and sound
from the air conditioner does not disturb
neighbors.
6. Place that can sufficiently endure the weight
and vibration of the outdoor unit and where
even installation is possible.
7. Place that has no direct influence of snow or
rain.
8. Place with no danger of snowfall or icicle drop.
9. Place without weak floor or base such as
decrepit part of the building or with a lot of
snow accumulation.
Rooftop Installations:
If the outdoor unit is installed on a roof structure,
be sure to level the unit. Ensure the roof
structure and anchoring method are adequate
for the unit location. Consult local codes
regarding rooftop mounting.
more than
700 (27 9/16)
more than
300 (11 13/16)
more than
600 (23 21/32)
more than
300 (11 13/16)
more than
600 (23 21/32)
Unit:mm(inch)
more than 300
(11 13/16)
more than 300
(11 13/16)
Unit:mm(inch)
10 Multi Air Conditioner
Installation of Indoor, Outdoor Unit
Seaside Applications and Installation
1.
Air conditioners should not be installed in areas where corrosive gases, such as acid or alkaline gas, are
produced.
2. Do not install the product where it could be exposed to sea wind (salty wind) directly. It can result
corrosion on the product. Corrosion, particularly on the condenser and evaporator fins, could
cause product malfunction or inefficient performance.
3. If outdoor unit is installed close to the seaside, it should avoid direct exposure to the sea wind.
1) If the outdoor unit is to be installed close to the seaside, direct exposure to the sea wind should be avoided.
Install the outdoor unit on the opposite side of the sea wind direction.
2)
In case, to install the outdoor unit on the seaside, set up a windbreaker/barrier, to lessen the unit's exposure to sea air
3) Select a well-drained place.
• It should be strong enough (like concrete) to obstruct
the wind from the sea.
• The height and width should be more than 150% of
the outdoor unit.
• A minimum of 70cm (27 1/16 inches)
of space between outdoor unit and the windbreak
for easy air flow.
Sea wind Sea wind
Sea wind
Windbreaker/Barrier
Periodic ( more than once/year ) cleaning of the dust or salt particles stuck on the heat exchanger
using water is recommended.
1. Selecting the location(Outdoor Unit)
Installation Manual 11
Installation of Indoor, Outdoor Unit
ENGLISH
Seasonal Wind And Cautions In Winter
- Sufficient measures are required in a snow area or severe cold area in winter so that product can
be operated well.
- Get ready for seasonal wind or snow in winter even in other areas.
- Install a suction and discharge duct not to let in snow or rain.
- Install the outdoor unit not to come in contact with snow directly. If snow piles up and freezes on the
air suction hole, the system may malfunction. If it is installed at snowy area, attach the hood to the
system.
- Install the outdoor unit at the higher installation console by 50cm than the average snowfall (annual
average snowfall) if it is installed at the area with much snowfall.
- Where snow accumulated on the upper part of the Outdoor Unit by more than 10cm, always
remove snow for operation.
1. The height of H frame must be more than 2 times the snowfall and its width shall not exceed the
width of the product. (If width of the frame is wider than that of the product, snow may accumulate)
2. Don't install the suction hole and discharge hole of the Outdoor Unit facing the seasonal wind.
12 Multi Air Conditioner
Installation of Indoor, Outdoor Unit
Multi Piping Type
Piping length and elevation
h2
h1
A
B
Multiple Piping Type
CAUTION: Capacity is based on standard length and maximum allowance
length is on the basis of reliability.
Unit : m(ft)
18k 50(164) 25(82) 3(10) 15(49) 7.5(25) 24k
24k 75(246) 25(82) 3(10) 15(49) 7.5(25) 33k
30k 75(246) 25(82) 3(10) 15(49) 7.5(25) 40k
Outdoor Unit
Capacity
(Btu/h class)
Max total length
of all pipes
(A+B)/(A+B+C)/
(A+B+C+D)
Max length of
each pipe
(A/B/C/D)
Min length of
each pipe
(A/B/C/D)
Max Elevation
between each
indoor unit and
outdoor unit (h1)
Max elevation
between indoor
units (h2)
Max.Combination
of Indoor unit
(Btu/h class)
Indoor unit Capacity (Btu/h class)
Pipe Diameter
Unit : mm(inch)
Gas Liquid
7,9,12,15k 9.52(3/8) 6.35(1/4)
18,24k 12.7(1/2) 6.35(1/4)
Installation Manual 13
Installation of Indoor, Outdoor Unit
Distributor Piping Type
h1
C
Branch Pipe
Main Pipe
Distributor
Distributor
A
B
h2
CAUTION: Capacity is based on standard length and maximum allowance
length is on the basis of reliability.
Unit : m(ft)
Outdoor Unit
Capacity
(Btu/h class)
Max total length
of all pipes
(Main + Branch
pipes)
Max length
of
Main pipe
(A+B+C)
Max length
of
Branch
pipes
Max length
of each
Branch pipe
Min length of
each pipe
(Main /
Branch
pipes)
Max Elevation
Between each
indoor unit and
outdoor unit
(h1)
Max
Elevation
Between
indoor
(h2)
Max
Combination
of indoor unit
(Btu/h class)
36k 145(476) 55(180) 90(295) 15(49) 3(10) 30(98) 15(49) 48k
42k 145(476) 55(180) 90(295) 15(49) 3(10) 30(98) 15(49) 56k
ENGLISH
Indoor unit Capacity (Btu/h class)
Pipe Diameter
Unit : mm(inch)
Gas Liquid
7,9,12,15k 9.52(3/8) 6.35(1/4)
18,24k 12.7(1/2) 6.35(1/4)
36k 15.88(5/8) 9.52(3/8)
14 Multi Air Conditioner
Installation
# Standard / Artcool Mirror Type
1. Prepare the indoor unit's piping and drain
hose for installation through the wall.
2. Remove the plastic tubing retainer(see the
illustration on the right) and pull the tubing
and drain hose away from chassis.
3. Route the indoor tubing and the drain hose to
the required piping hole position.
4. Insert the piping, drain hose, and the
connecting cable into the piping hole.
5.
Insert the connecting cable into the indoor unit.
• Don't connect the cable to the indoor unit.
• Make a small loop with the cable for easy
connection later.
6. Tape the tubing and drain hose.
7. Indoor unit installation
• Hang the indoor unit from the hooks at the
top of the installation plate.
• Insert the spacer etc. between the indoor
unit and the installation plate and separate
the bottom of the indoor unit from the wall.
Drain pipe
Connecting
pipe
Tape
Drain hose
Installation plate
Spacer
Indoor unit
80(3 5/32)
For right rear piping For left rear piping
Installation
Connecting the piping
[Wall mounted / ART COOL Mirror]
Installation Manual 15
Installation
ENGLISH
# Standard Libero / Artcool Libero Type
1. Pull the screw cap at the bottom of the
indoor unit
2. Remove the chassis cover from the unit
by loosing screws
3. Pull back the tubing holder.
4. Remove pipe port cover and positioning
the tubing
Chassis cover
Right
Indoor unit back side view
Tubing holder
Backwards
Left
Pipe Port
5. Indoor unit installation
1) Hook the indoor unit onto the upper portion
of the installation plate.( engage the three
hooks at the top of the indoor unit with the
upper edge of the installation plate) Ensure
that the hooks are properly seated on the
installation plate by moving it left and right
2) Unlock the tubing holder from the chassis
and mount between the chassis and
installation plate in order to separate the
bottom side of the indoor unit from the wall
Tubing Holder
Installation plate
16 Multi Air Conditioner
Installation
Connecting the piping to the indoor unit
and drain hose to drain pipe.
1. Align the center of the pipes and
sufficiently tighten the flare nut by hand.
2. Tighten the flare nut with a wrench.
3. Next, extend the indoor unit's drain hose.
Then attach the drain pipe.
Indoor unit tubing Flare nut Pipes
Wrench
Indoor unit tubing
Open-end wrench (fixed)
Connection pipe
Flare nut
Vinyl tape(narrow)
Adhesive
Drain pipe
Indoor unit drain hose
Installation Information. For left piping. Follow the instruction below.
Good case
• Press on the upper side of clamp and unfold the tubing to slowly downward.
Bad case
• Bending the pipe from right to left may cause damage to the tubing.
Outside diameter Torque
mm inch N. m kgf.m lbf.ft
Ø6.35 1/4 14~18 1.4~1.8 10~13
Ø9.52 3/8 34~42 3.5~4.3 25~31
Ø12.7 1/2 49~61 5.0~6.2 36~45
Ø15.88 5/8 69~82 7.0~8.4 51~60
Ø19.05 3/4 100~120 10.0~12.2 73~88
Installation Manual 17
Installation
ENGLISH
Wrap the insulation material around the
connecting portion.
1. Overlap the connection pipe insulation and the
indoor unit pipe heat insulation material. Bind
them together with vinyl tape so that there is no
gap.
2. Wrap the area which accommodates the rear
piping housing section with vinyl tape.
3. Bundle the piping and drain hose together by
wrapping them with vinyl tape over the range
within which they fit into the rear piping housing
section.
Reroute the pipings and the drain hose across
the back of the chassis.
Finishing the indoor unit installation
# Standard / Artcool Mirror Type
1. Remove the spacer.
2. Ensure that the hooks are properly seated on
the installation plate by moving it left and right.
3. Press the lower left and right sides of the unit
against the installation plate until the hooks
engage into their slots(clicking sound).
# Standard Libero / Artcool Libero Type
1.
Mount the tubing holder in the original positon.
2.
Ensure that the hooks are properly seated on the
installation plate by moving it left and right.
3. Press the lower left and right sides of the unit
against the installation plate until the hooks
engage into their slots (clicking sound).
4.
Finish the assembly by screwing the unit to the
installation plate by using two pieces of type "C"
screws. And assemble a chassis cover.
Plastic bands
Insulation material
Vinyl tape(narrow)
Connection pipe
Vinyl tape (wide)
Wrap with vinyl tape
Indoor unit pipe
Pipe
Drain hose
Vinyl tape(wide)
Piping for
passage through
piping hole
Drain hose
Connecting
Type 'C' screw
If the split type Indoor unit is installed in a wall having hole or opening near by or back side of the
unit, then the air from other side of the wall can come inside the condition space through that hole /
opening. That air can cause unwanted dew / water droplet formation when it comes in contact with
body of the indoor unit. So all hole or opening on the wall must be blocked very well to avoid water
dropping from the body of the unit.
18 Multi Air Conditioner
Installation
The wall you select should be strong and solid enough to prevent vibration
1. Mount the installation plate on the wall with
type "A" screws. If mounting the unit on a concrete wall, use anchor bolts.
• Mount the installation plate horizontally by aligning the centerline using a level.
2. Measure the wall and mark the centerline. It is also important to use caution concerning the
location of the installation plate-routing of the wiring to power outlets is through the walls
typically. Drilling the hole through the wall for piping connections must be done safely.
How To Fix
Installation of filters
1) Detach two attached tapes from the plasma
filter.
Plasma Filter
Ø65
(2 11/20)
Ø65
(2 11/20)
110(4 11/32)
110
(4 11/32)
90
(3 17/32)
70
(2 3/4)
Chassis
Hook
Installation Plate
Type “A”
Left rear piping Right rear piping
Ø65
(2 11/20)
133(5 1/4)
Ø65
(2 11/20)
100(3 15/16)
Chassis
Hook
Installation Plate
Type “A”
Left rear piping Right rear piping
Ø65
(2 11/20)
133(5 1/4)
95(5 3/4)
217(8 17/32)
175(6 7/8)
442(17 13/32) 442(17 13/32)
Ø65
(2 11/20)
Installation Plate
Enganche
del chasis
Type "A" Screws
Right rear piping
Left rear piping
Installation Plate
Place a level on raised tab
Unit Outline
Ø65
(2 11/20)
Ø65
(2 11/20)
69(2 23/32)
56(2 7/32)
207(8 5/32)
105(4 1/8)
460(18 1/8) 570(22 7/16)
Installation Plate
Enganche
del chasis
Type "A" Screws
Left rear piping
Installation Plate
Place a level on raised tab
Unit Outline
Right
rear
piping
Measuring Tape
Hanger
Measuring Tape
<Type 1> <Type 2>
<Type 3> <Type 4>
Indoor Type
Capacity (Btu/h class)
Type
Wall mounted / ART COOL
Mirror
7,9,12,15k
Type 1 / Type 3
18,24k
Type 2 / Type 4
Installation Manual 19
Installation
ENGLISH
Wiring Connection
1. 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.
2. Attach the Grille onto the cabinet.
• Grasp the lower left and right side of the
Grille and engage four tabs on the top inside
edge of the chassis.
• Press the Grille toward the chassis until it
goes back into place.
Connecting cable
Conduit connection
1. Set the connecting cable into the terminal
block of indoor unit, and tighten set screw to
lock the conduit bracket to the indoor unit.
2. Join the conduit and the conduit bracket
together.
Connecting cable
Lock nut
Conduit
Conduit
bracket
Terminal Block in Indoor
1(L1) 2(L2) 3 4
Connected to Outdoor Unit
View
Terminal block
Connecting cable
Cable retainer
CAUTION :
Must use
the elbow type (L-Type)
conduit.
20 Multi Air Conditioner
Installation
[Ceiling Cassette Type]
Ceiling dimension and hanging bolt location
Level gauge
Ceiling
Ceiling board
Unit: mm(inch)
585~660(23 1/16~26) (Ceiling Opening)
517(20 3/8)
461(18 5/32)
517(20 3/8)
585~660(23 1/16~26) (Ceiling Opening)
523(20 19/32)
570(22 15/32)
Unit Size
570(22 15/32)
Unit Size
319(12 9/16)
• The dimensions of the paper model for installation are the same as those of the ceiling opening dimensions.
• Avoid the following installation location.
1. Such places as restaurants and kitchen where considerable amount of oil steam and flour is generated.
These may cause heat exchange efficiency reduction, or water drops, drain pump mal-function.
In these cases, take the following actions;
• Make sure that ventilation fan is enough to cover all noxious gases from this place.
• Ensure enough distance from the cooking room to install the air
conditioner in such a place where it may not suck oily steam.
2. Avoid installng air conditioner in such places where
cooking oil or iron powder is generated.
3. Avoid places where inflammable gas is generated.
4. Avoid place where noxious gas is generated.
5. Avoid places near high frequency generators.
NOTICE
CAUTION :
• This air-conditioner uses a drain pump.
• Install the unit horizontally using a level
gauge.
• During the installation, care should be
taken not to damage electric wires.
• Select and mark the position for fixing bolts and piping
hole.
• Decide the position for fixing bolts slightly tilted to the
drain direction after considering the direction of drain
hose.
• Drill the hole for anchor bolt on the wall.
Use the ventilation fan
for smoke-collecting
hood with sufficient
capacity.
Cooking table
Air conditioner
Take enough
distance
Installation Manual 21
Installation
ENGLISH
Set screw of
paper model (4 pieces)
Paper model
for installation
Ceiling board
150mm
(5-7/8 inch)
Ceiling board
Ceiling
Flat washer for M10
(accessory)
Keep the length of the bolt
from the bracket to 40mm(1-9/16 inch)
Open the ceiling board
along the outer edge of the
paper model
Flat washer for M10
(accessory)
Hanging bolt
(W3/8 or M10)
Nut
(W3/8 or M10)
Nut
(W3/8 or M10)
Spring washer
(M10)
Air Conditioner body
Keep the length of 31~34mm(1.22~1.34inch)
between the air conditioner bottom surfac
e and the ceiling surface
• The following parts are local purchasing.
① Hanging Bolt - W 3/8 or M10
② Nut - W 3/8 or M10
③ Spring Washer - M10
④ Plate Washer - M10
CAUTION : Tighten the nut and bolt to
prevent unit from falling off.
Wiring Connection
How to Fix
1(L1) 2(L2) 3 4 5
Terminal Block of Indoor Unit
Connected to outdoor unit
OPTION
TO AIR
FRESH
KIT
TQ/TR series
Connecting Cable
Conduit
Screw
Conduit bracket
Conduit connection
• Remove the busing rubber product attached on the indoor unit.
• Join the conduit and the conduit bracket together using nut.
• Set the connecting cable into the terminal block of indoor unit, and tighten set screw to lock the
conduit bracket to the indoor unit.
• Open the control box cover and connect the remote control cord and indoor power wires.
22 Multi Air Conditioner
Installation
Installation of Wired Remote Controller(Optional)
1
2
3
2
3
<Wire guide grooves>
1. Please fix tightly using provided screw after placing remote controller setup board
on the place where you like to setup.
- Please set it up not to bend because poor setup could take place if setup board bends.
Please set up remote controller board fit to the reclamation box if there is a reclamation box.
- Install the product so as not to make a gap with the wall side and to prevent shaking after the installation.
2. Can set up Wired remote controller cable into three directions.
- Setup direction: the surface of wall reclamation, upper, right
- If setting up remote controller cable into upper and right side, please set up after removing remote
controller cable guide groove.
h
Remove guide groove with long nose.
①
Reclamation to the surface of the wall
②
Upper part guide groove
③
Right part guide groove
Installation Manual 23
Installation
ENGLISH
Wall
Side
Wall
Side
Wall
Side
Wall
Side
<Connecting order>
<Separating order>
3. Please fix remote controller upper part into
the setup board attached to the surface of the
wall, as the picture below, and then, connect
with setup board by pressing lower part.
- Please connect not to make a gap at the remote controller
and setup board’s upper and lower, right and left part.
- Before assembly with the installation board, arrange the
Cable not to interfere with circuit parts.
When separating remote controller from setup
board, as the picture below, after inserting
into the lower separating hole using screw
driver and then, spinning clockwise, remote
controller is separated.
- There are two separating holes. Please individually
separate one at a time.
- Please be careful not to damage the inside
components when separating.
4. Please connect indoor unit and remote controller using connection cable.
5. Please use extension cable if the distance between wired remote controller and
indoor unit is more than 10m(32.8ft).
Please check if connector is normally connected.
Connecting cable
Indoor
Unit side
When installing the wired remote controller, do not bury it in the wall.
(It can cause damage in the temperature sensor.)
Do not install the cable to be 50m(164ft) or above.
(It can cause communication error.)
• When installing the extension cable, check the connecting direction of the connector of the remote
controller side and the product side for correct installation.
• If you install the extension cable in the opposite direction, the connector will not be connected.
• Specification of extension cable: 2547 1007 22# 2 core 3 shield 5 or above.
CAUTION
12V Red
Signal Yellow
GND Black
24 Multi Air Conditioner
Installation
Installation of Decorative Panel
The decorative panel has its installation direction.
Before installing the decorative panel, always remove the paper template.
1. Remove the packing and take out air inlet
grille from front panel.
2. Remove the Corner covers of the panel.
3. Fit the panel on the unit by inserting
hooks as shown in picture.
4. Insert two screws on diagonal corners of
panel. Do not tighten the bolts completely.
(The fixing screws are included in the
indoor unit box.)
Check the alignment of panel with the
ceiling. Height can be adjusted using
hanging bolts as shown in picture. Insert
the other two screws and tighten all
screws completely.
Front grille
Coner cover
Hook clip
Hook
Installation Manual 25
Installation
ENGLISH
5. Fit the corner covers.
6. Open two screws of control panel cover.
7. Connect one display connector and two
vane control connectors of front panel to
indoor unit PCB.
The position marking on PCB is as:
Display connector : CN-DISPLAY
Vane control connector: CN-VANE 1,2
8. Close the cover for control box.
9. Install the air inlet grille and Filter on the
panel.
Screw
CN-VANE 1,2
CN-DISPLA
Y
26 Multi Air Conditioner
Installation
CAUTION:
Install certainly the decorative panel.
Cool air leakage causes sweating. Water drops fall.
Air conditioner
unit
Ceiling
board
Decorative panel
Decorative
panel
Fit the insulator (this part) and
be careful for cool air leakage
Good example
Air
Cool air leakage
(no good)
Bad example
Ceiling
board
Air conditioner unit
Flexible drain hose
HEAT INSULATION
1. Use the heat insulation material for the refrigerant piping which has an excellent heat-
resistance [over 120°C(248°F)].
2. Precautions in high humidity
circumstance:
This air conditioner has been tested
according to the "KS Standard
Conditions with Mist" and confirmed that
there is not any default. However, if it is
operated for a long time in high humid
atmosphere [dew point temperature:
more than 23°C(73.4°F)], water drops
are liable to fall. In this case, add heat
insulation material according to the
following procedure:
• Heat insulation material to be prepared... Adiabatic glass wool with thickness 10 to 20mm.
• Stick glass wool on all air conditioners that are located in ceiling atmosphere.
Indoor unit
Thermal insulator
(accessory)
Fastening band
(accessory)
Refrigerant piping
Drain Piping
1. The drain hose should point downward for
optimum drainage.
2. Incorrect Installation Examples:
Downward slope
Do not raise
Accumulated
drain water
Tip of drain hose
dipped in water
Air
Kinking
Water
leakage
Water
leakage
Ditch
Less than 50mm
(1 31/32 inch) gap
Water
leakage
[Standard / Standard Libero / Artcool Mirror Type]
Installation Manual 27
Installation
ENGLISH
CAUTION : The supplied
flexible drain hose should not
be curved, neither screwed.
The curved or screwed hose
may cause a leakage of water.
[Ceiling Concealed Duct/Ceiling Cassette Type]
• Drain piping must have down-slope (1/50 to 1/100): be
sure not to provide up-and-down slope to prevent
reversal flow.
• During drain piping connection, be careful not to exert
extra force on the drain port on the indoor unit.
• The outside diameter of the drain connection on the
indoor unit is 32mm(1 1/4 inch).
•
Be sure to install heat insulation on the drain piping.
Piping material: Polyvinyl chloride pipe inner
diometes Ø 25mm(1 inch) and pipe fittings
• Connect the main drain pipe to the exterior
and leave it provisionally until the test comes
to an end.
• Feed water to the flexible drain hose and
check the piping for leakage.
• Be sure to check the drain pump for normal
operating and noise when electrical wiring is
complete.
• When the test is complete, connect the flexible
drain hose to the drain port on the indoor unit.
The air conditioner uses a drain pump to drain water.
Use the following procedure to test the drain pump operation:
Heat insulation material: Polyethylene foam
with thickness more than 8mm(5/16 inch).
Drain test
Maintenance
drain port
Upward
routing
not allowed
Pipe clamp
Indoor unit
1/50~1/100
Flexible drain hose
MAX : 700 mm(27 9/16 inch)
Feed water
Drain Pump
Drain pan
Flexible drain hose
(accessory)
Main
drain pipe
Glue the joint
Drain
port
Drain hose connection
Use the clip (accessory)
Flexible drain hose
1/50~1/100
Flexible drain hoseFlexible drain hoseFlexible drain hose
h The figure can be changed according to model.
28 Multi Air Conditioner
Installation
Attention
1. Possible drain-head height is up to
700mm(27 9/16 inch). So, it must be
installed below 700mm(27 9/16 inch).
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(3/16 inch) or thicker formed thermal
insulator is provided for the drain pipe.
4. Upward routing is not allowed.
5. Be sure to check the drain pump for normal
operation and abnormal noise when
electrical wiring is complete.
1/50~1/100
MAX 700mm
(27 9/16 inch)
Elbow
Drain pump
Unit
Drain pipe
(Local supply)
Thermal insulator
(Local supply)
Wall
Drain hose
Installation Manual 29
Flaring Work and Connection of Piping
ENGLISH
Flaring Work and Connection of Piping
Flaring work
Main cause of gas leakage is defect in flaring
work. Carry out correct flaring work in the
following procedure.
1) Cut the pipes and the cable.
n Use the accessory piping kit or the pipes
purchased locally.
n Measure the distance between the indoor
and the outdoor unit.
n Cut the pipes a little longer than
measured distance.
n Cut the cable 1.5m(4.9ft) longer than the
pipe length.
2) Burrs removal
n Completely remove all burrs from the cut
cross section of pipe/tube.
n Put the end of the copper tube/pipe to
downward direction as you remove burrs
in order to avoid to let burrs drop in the
tubing.
3) Putting nut on
n Remove flare nuts attached to indoor and
outdoor units, than put them on pipe/tube
having completed burr removal.
(Not possible to put them on after flaring
work)
4) Flaring work
n Carry out flaring work using flaring tool as
shown below.
Firmly hold copper tube in a bar(or die) as
indicated dimension in the table above.
5) Check
n Compare the flared work with figure.
n If flare is noted to be defective, cut off the
flared section and do flaring work again.
Copper
tube
90
Slanted Uneven Rough
Pipe
Reamer
Point down
Flare nut
Copper tube
Bar
Copper pipe
Clamp handle
Red arrow mark
Cone
Yoke
Handle
Bar
"A"
Inclined
Inside is shining without scratches.
Smooth all round
Even length
all round
Surface
damaged
Cracked Uneven
thickness
= Improper flaring =
Outside diameter A
mm inch mm inch
Ø6.35 1/4 1.1~1.3 0.04~0.05
Ø9.52 3/8 1.5~1.7 0.06~0.07
Ø12.7 1/2 1.6~1.8 0.06~0.07
Ø15.88 5/8 1.6~1.8 0.06~0.07
Ø19.05 3/4 1.9~2.1 0.07~0.08
30 Multi Air Conditioner
Flaring Work and Connection of Piping
Align the center of the piping and sufficiently
tighten the flare nut by hand.
Connecting pipe order
1) ROOM A~C gas side pipe
2) ROOM A~C liquid side pipe
Finally, tighten the flare nut with torque wrench
until the wrench clicks.
• When tightening the flare nut with torque
wrench ensure the direction for tightening
follows the arrow on the wrench.
Outdoor unit (18,24,30kBtu/h class)
(only Indoor units
18,24kBtu/h class)
Liquid
side piping
Main liguid
side valve
Main gas
side valve
ROOM A
ROOM B
ROOM C
Gas side
piping
Outdoor unit (36,42kBtu/h class)
(only indoor units
18,24kBtu/h class)
(only indoor units
36kBtu/h class- connect “D ROOM”)
(BD Unit : PMBD3641)
(BD Unit : PMBD3640)
A ROOM
B ROOM
C ROOM
D ROOM
A ROOM
B ROOM
C ROOM
D ROOM
Connection of piping - Outdoor
Outside diameter Torque
mm inch N. m kgf.m lbf.ft
Ø6.35 1/4 14~18 1.4~1.8 10~13
Ø9.52 3/8 34~42 3.5~4.3 25~31
Ø12.7 1/2 49~61 5.0~6.2 36~45
Ø15.88 5/8 69~82 7.0~8.4 51~60
Ø19.05 3/4 100~120 10.0~12.2 73~88
BD Unit
Refrigerant Connections Pipe
Size (inch (mm))
Connectable
Indoor Unit
Capacity (kBtu/h
class)
Liquid Gas
PMBD3620
1/4 (Ø6.35)
x 2EA
3/8 (Ø9.52) x
2EA
7,9,12,15,18,24k
PMBD3630
1/4 (Ø6.35)
x 3EA
3/8 (Ø9.52) x
3EA
7,9,12,15,18,24k
PMBD3640
1/4 (Ø6.35)
x 4EA
3/8 (Ø9.52) x
4EA
7,9,12,15,18,24k
PMBD3641
1/4 (Ø6.35)
x 4EA
3/8 (Ø9.52)
x 3EA
7,9,12,15,18,24k
(A,B,C ROOM)
1/2 (Ø12.7)
x 1EA
24,36k
(D ROOM)
h BD Unit(PMBD3641) includes the socket.
(Ø 12.7 → Ø 15.88 x 1EA, Ø 6.35 → Ø 9.52 x 1EA)
Installation Manual 31
Flaring Work and Connection of Piping
ENGLISH
• For the units with capacity more than 36kBtu/h
class, the installation piping is connectable in four
directions.(refer to figure 1)
• When connecting in a downward direction, knock
out the knockout hole of the base pan.
(refer to figure 2)
Preventing foreign objects from entering
(Figure3)
• Plug the pipe through-holes with putty or
insulation material(procured locally)to stop up all
gaps,as shown in the figure 3.
• Insects or small animals entering the outdoor unit
may cause a short circuit in the electrical box.
Forward
Sideways
Backward
Knock-out Base pan
Downward
Gas side piping
(Bigger Dia.)
Liquid side piping
(Smaller Dia.)
Putty or insulating material
(produced locally)
Drain hose
Connecting wire
Connection pipe
<Figure 1>
<Figure 2>
<Figure 3>
Continuous
Torque
wrench
(250mm )
→
❈ When tighten the pipe, hold the haxagonal body.
32 Multi Air Conditioner
Flaring Work and Connection of Piping
Viewed from point A
in direction of arrow
Horizontal
plane
Gas PipeModel
PMBL5620
Ø19.05
Ø19.05
Liquid Pipe
Within +/- 10
A
Ø9.52
Ø9.52
Ø9.52
Ø19.05
Y branch
A
B
To Outdoor Unit
[unit:mm]
To BD Unit
A
B
Facing
upwards
Facing
downwards
Within ±3° Within ±3°
Liquid and gas
pipe joints
Insulator
(included with kit)
Insulator for
field piping
Tape
(field supply)
Liquid and gas
pipe joints
Insulation
Branch
• Ensure that the branch pipes are attached horizontally or vertically (see the diagram
below.)
• Branch pipe should be insulated with the insulator in each kit.
Installation Manual 33
Flaring Work and Connection of Piping
ENGLISH
Installation
• This unit may be installed suspended from the ceiling or mounted on the wall.
• This unit may be installed horizontally , as shown in the diagram below.(Side B is facing up)
However, it may be freely installed in any direction forward or back, and to the sides.
• Be sure to leave a 600mm square opening for service and inspection as shown in the diagram
below, for both ceiling - suspended installation and wall-mounted installation.
• This unit "does not require drain treatment" as it uses internal foam treatment as low-pressure
piping insulation.
• Service direction is the side B and C
• The piping for the indoor unit may be led around in direction A
• The inclination of side B must be within ±5 degrees forward or back or to the sides.
Min 400(15 3/4)
Min 30(1 3/16)
Min 100(3 15/16)
Min 400(15 3/4)
Branch Pipe
432(17)
160(6 5/16)
Cover Control
Main Pipe
(Servicing space)
B
C
Inspection opening
Min 300(11 13/16)
Min 300(11 13/16)
298(11 23/32)
250(9 27/32)
Ø19.05(3/4)
Ø9.52(3/8)
Suspension bolt pitch.
245(9 21/32)
337(13 9/32)
A
Unit : mm(inch)
34 Multi Air Conditioner
Flaring Work and Connection of Piping
:
• This unit has two different installation types:
(1) Ceiling-suspended type and (2) wall-mounted
type.
• Choose the proper installation pattern according to
the location of installation.
• The installation location for printed wiring board can
be changed.
Follow the procedure specified in the "CONNECTING
THE WIRING" section to change the location.
NOTICE
(1) Ceiling-suspended type
(2) Wall-mounted type
Screws(M5)
Screws(M5)
(locally procude)
(locally procude)
Screws(M5)
(locally procude)
PE
PE
BD unit
Six-sided Nut
Six-sided Nut
(M10 or M8)
(M10 or M8)
Six-sided Nut
(M10 or M8)
Hanger metal
Hanger metal
Hanger metal
Flat washer
Flat washer
Flat washer
Hanging bolt
Hanging bolt
Hanging bolt
(M10 or M8)
15.00
Procedure
(1) Fix the furnished hanger metal with two screws.(4 locations
in total).
(2) Using an insert-hole-in- anchor, hang the hanging bolt.
(3) Install a hexagon nut and a flat washer (locally-procured)to
the hanging bolt as shown in the figure in the left, and lift the
main unit to hang on the hanger metal.
(4) After checking with a level that the unit is level, tighten the
hexagon nut.
* The tilt of the unit should be within ±5° in front/back and
left/right.
CAUTIONS
• Once a screw-hole on the main unit has had a screw hammered in, make sure to either hammer it again
or cover it with alumium tape.(This is to prevent condensation)
• Be sure to install the unit with the ceiling-side up.
• Do not install near bedrooms. the sound of refrigerant flowing through the piping may sometimes be audible.
(1) Ceiling-suspended type (2) Wall-mountde type
Installation of The Main Unit
Procedure
(1) Fix the furnished hanger metal with two screws.
(3 locations in total).
(2) After checking with a level that the unit is level, fix the
unit with the furnished wood screws.
* The tilt of the unit should be within ±5° in front/back and
left/right.
* Block up the parts of hanger holes (2 places) by using
insulation PE after installing the hanger.
Installation Manual 35
Connecting the Cable between Indoor Unit, Distributor Unit and Outdoor Unit
ENGLISH
Connecting the Cable between Indoor Unit, Distributor Unit and Outdoor Unit
Connect the cable to the indoor unit by connecting the wires to the terminals on the control
board individually according to the outdoor unit connection. (Ensure that the color of the wires
of the outdoor unit and the terminal No. are the same as those of the indoor unit.)
The ground wire should be longer than the common wires.
The circuit diagram is not subject to change without notice.
When installing, refer to the electrical diagram behind the front panel of Indoor Unit.
The wiring for the outdoor unit can be found on the inside of the Outdoor Unit control cover.
Connect the cable to the Indoor unit.
RECOMMENDATION:
• The circuit diagram is subject to change without notice.
• Be sure to connect wires according to the wiring diagram.
• Connect the wires firmly, so that they can not be pulled out easily.
• Connect the wires according to color codes by referring to the wiring diagram.
RECOMMENDATION:
Provide a circuit
breaker between power source and
the outdoor unit as shown below.
RECOMMENDATION:
The power cord connected to the outdoor unit should
comply with the following specifications: NRTL Recognized(for example, UL or
ETL recognized and CSA certified).
Air
Conditioner
Main power source
Circuit Breaker
Use a circuit breaker
or time delay fuse.
Line voltage
(208/230V)
GN/YL
20mm
(25/32 inch)
GN/YL
20mm
(25/32 inch)
RECOMMENDATION: When using separate wires as the power cord, please secure
separate wires in the control box panel using tie wraps to hold all wires in place.
n Power supply cable
n Connecting cable
Outdoor Unit Capacity
(Btu/h class)
Power source
Fuse or breaker
Capacity
18,24,30k 1Ø,208/230V 30A
36,42k 1Ø,208/230V 45A
As always, final wire selection is governed by local codes and
should be installed by a licensed professional contractor.
The power connecting cable between the outdoor and
indoor units must comply with the following specifications:
NRTL Recognized (for example, UL or ETL recognized and
CSA certified).
AWG 18-4 is the minimum recommended wire size,
however, the selected conductors must comply with local
codes and be suitable for installation in wet locations.
Outdoor Unit Capacity
(Btu/h class)
The minimum recommended wire size
18,24,30k AWG 12-3
36,42k AWG 8-3
36 Multi Air Conditioner
Connecting the Cable between Indoor Unit, Distributor Unit and Outdoor Unit
• Connect refrigerant pipes and connection wires to the appropriate ports maked with matching
alphabets (A, B and C) on this unit.
• Follow the instructions on the wiring nameplate to connect the connection wires of indoor/outdoor
units to terminal board numbers.(1, 2 and 3) Always fix each ground wire separately with a ground
screw.(See the figure below.)
• After completing the wiring, fix the outer coating of wires securely with wire clamps. The wire
clamp on indoor unit side is furnished. Follow the procedure below to install.
• Refer to the circuit diagram on the control cover inside outdoor unit.
:
The terminal board numbers are arranged from top to bottom in order of 1, 2 and 3.
NOTICE
Connect the cable to the Distributor unit.
• For wiring, use the designated power wire and connect firmly, then secure to prevent
outside pressure being exerted on the terminal block.
• Use an appropriate screwdriver for tightening the terinal screws. A screwdriver with a
small head will strip the head and make proper tighterning impossible.
• Over-tightening the terminal screws may break them.
When none are available, follow the instructions below.
• Do not connect wiring of different thicknesses to the power terminal block. (Slack in
the power wiring may cause abnormal heat.)
• When connecting wiring which is the same thickness, do as shown in the figure
below.
u
Precautions when laying power and ground wiring
Round pressure terminal
Power wire(Ground wire)
Use round pressure terminals for connections to the power terminal block.
When laying ground wiring, you must use round pressure terminals.
Installation Manual 37
Connecting the Cable between Indoor Unit, Distributor Unit and Outdoor Unit
ENGLISH
(1) Remove the control cover. Loosen the two
screws, and slide the cover in the direction
of the arrow.
(2) Pull out connection cable through conduit.
After conduit to the panel, fix nut to the
opposite side of panel. Pass the connection
cabel through the hole.
(3)
Perform wiring with reference the wiring diagram
on a control cover of outdoor unit. Allow 300
mm(11 13/16 inch) for the pulling-out section of
harness. Fix the wires completely with wire
clamps(4 locations).
(4) Put in the cover in the direction of the arrow
then tighten the screws.
Warning
Do not use tapped wires,
stand wires, extensioncords,
or starbust connections, as
they may cause
overtheating, electrical
shock, or fire.
A room
B room
C room
A
B
C
CN-PWR
Connection wire for indoor units
(AWG 18-4)
Connection wire for outdoor units
(AWG 16-4)
Lock nut (field supply)
Lock nut (field supply)Lock nut (field supply)
Conduit (field supply)
Lock nut (field supply)
Lock nut (field supply)
In Case of 3 rooms
38 Multi Air Conditioner
Connecting the Cable between Indoor Unit, Distributor Unit and Outdoor Unit
Connect the cable to the Outdoor unit.
1. Remove the control cover from the unit by
loosening the screw.
Connect the wires to the terminals on the control
board individually as the following.
2. Secure the cable onto the control board with the
holder (clamper).
3. Re-attach the cover control to the original
position using the screws.
18kBtu/h class
24kBtu/h class
30kBtu/h class
PowerPower
supply cablesupply cable
Power
supply cable
Connecting cable
Connecting cable
(to the indoor unit)(to the indoor unit)
Connecting cable
(to the indoor unit)
Conduit
hole
Installation Manual 39
Connecting the Cable between Indoor Unit, Distributor Unit and Outdoor Unit
ENGLISH
36,42kBtu/h class
Power cord terminal
Connecting cable terminal
Cord clamp
Cord clamp
* Make sure the rubber bushes are
Properly used in knock-out holes after
connecting main power cable.
:
1. Use connection cable NRTL(UL, ETL, CAS…) listed and stranded copper(4) THHN conductors,
sunlight (UV) resistant ROHS compliant PVC jacket 600V direct burial listed, approved for wet
conditions. Temperature rated for –20℃(-4℉) to 90℃(194℉). And this cable should be enclosed
in conduit.
WARNING:
• Be sure to comply with local and national codes while running the wire from the indoor unit to the
outdoor unit(size of wire and wiring method, etc).
• Every wire must be connected firmly.
• No wire should be allowed to touch refrigerant tubing, the compressor or any moving parts.
• The communication wirings of air conditioner should be separate and isolated from external
device’s electric wiring such as computers, elevator, radio & Television broadcasting facilities, as
well as medical imaging offices.
NOTICE
40 Multi Air Conditioner
Connecting the Cable between Indoor Unit, Distributor Unit and Outdoor Unit
(1) Remove the side panel and knockouts of conduit
panel. (for low voltage line)
(2) Pull out connection cable through conduit.
(3) After conduit to the panel, fix nut to the opposite
side of panel.
(4) Pass the connection cabel through the hole.
(5) Properly connect the cable on the terminal block.
(6) Fix the connection cable with cord clamp
provided on the unit not to have strain at the
terminal when the connection cable is pulled
outside up to a 35 pound weight
WARNING: Loose wiring may cause
the terminal to overheat or result in
unit malfunction. A fire hazard may
also exist. Therefore, be sure all
wiring is tightly connected.
When connecting each power wire to the
corresponding terminal, follow instructions "How
to connect wiring to the terminals" and fasten the
wire tightly with the fixing screw of the terminal
plate.
How to connect wiring to the terminals
◼ For strand wiring
(1) Cut the wire end with a wire cutter or wire-
cutting pliers, then strip the insulation to
expose the strand wiring about 10 mm(3/8").
(2) Using a screwdriver, remove the terminal
screw(s) on the terminal plate.
(3) Using a round terminal fastener or pliers,
securely clamp each stripped wire end with a
round terminal.
(4) Position the round terminal wire, and replace
and tighten the terminal screw using a
screwdriver.
Connection method of the connecting cable(Example)
Power supply cable
Connecting Cable
Strip 10 mm(3/8")
Round
terminal
Connecting cable
Loosening the
terminal block
screw
Fastening the
wire tightly
Strand wire
Power supply cablePower supply cable
(1Ø, 208/230V)(1Ø, 208/230V)
Power supply cable
(1Ø, 208/230V)
Connecting cable
Connecting cable
(1Ø, 208/230V)(1Ø, 208/230V)
Connecting cable
(1Ø, 208/230V)
Lock nut
(field supply)
Indoor Unit A
Conduit
(filed supply)
Indoor Unit B
Indoor Unit C
Indoor Unit D
Conduit
hole
Installation Manual 41
Checking the Drainage, Insulating the Pipe and Special Piping Applications
ENGLISH
Insulating the Pipe and Special Piping Applications
Insulate the piping by wrapping the connecting
portion of the indoor unit with insulation material
and secure it with two kinds of vinyl tape.
• If you want to connect an additional drain hose,
the end of the drain outlet should be routed
above the ground. Secure the drain hose
appropriately. If you want to install the wires to
be connected the Conduit Hall.
In cases where the outdoor unit is
installed below the indoor unit
perform the following:
1. Tape the piping, drain hose and connecting
cable from down to up.
2. Secure the taped piping along the exterior
wall using saddle or equivalent.
In cases where the Outdoor unit is
installed above the Indoor unit
perform the following.
1. Tape the piping and connecting cable from
down to up.
2. Secure the taped piping along the exterior
wall. Form a trap to prevent water entering
the room.
3. Secure the piping onto the wall using a saddle
or equivalent.
• Trap is required to prevent water from entering
into electrical parts.
Plastic
band
Seal a small opening
around the pipings
with gum type
sealer.
Seal a small opening
around the pipings
with gum type sealant.
Trap
Trap
Checking the Drainage, Insulating the Pipe and Special Piping Applications
Checking the drainage
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.
h The figure can be changed according to model.
Air Purging and Evacuation
Air and moisture remaining in the refrigerant system have undesirable effects as indicated below.
1. Pressure in the system rises.
2. Operating current rises.
3. Cooling(or heating) efficiency drops.
4. Moisture in the refrigerant circuit may freeze and block capillary tubing.
5. Water may lead to corrosion of parts in the refrigeration system.
Therefore, the indoor/outdoor unit and connecting tube must be checked for leaks, and vacuumed
to remove incondensible gas and moisture in the system.
Preparation
• Check that each tube(both liquid and gas side
tubes) between the indoor and outdoor units have
been properly connected and all wiring for the test
run has been completed. Remove the service
valve caps from both the gas and the liquid sides
on the outdoor unit. Check that both the liquid and
the gas side service valves on the outdoor unit are
kept closed at this stage.
Leakage test
• Connect the manifold valve(with pressure gauges)
and dry nitrogen gas cylinder to this service port
with charge hoses.
CAUTION: Be sure to use a
manifold valve for leak testing.
The high side manifold valve must
always be kept closed.
• Pressurize the system to no more than 550
P.S.I.G. with dry nitrogen gas and close the
cylinder valve when the gauge reading
reached 550 P.S.I.G. Next, test for leaks with
liquid soap.
CAUTION:
To avoid nitrogen
entering the refrigerant system in a
liquid state, the top of the cylinder must be
higher than its bottom when you pressurize
the system. Usually, the cylinder is used in
a vertical standing position.
:
Leakage testing shoud be done for
each indoor unit connection set, separately.
1. Do a leakage test of all joints of the
tubing(both indoor and outdoor) and both gas
and liquid side service valves with soap
bubbles.
Bubbles indicate a leak. Be sure to wipe off
the soap with a clean cloth.
2. After the system is found to be free of leaks,
relieve the nitrogen pressure by loosening the
charge hose connector at the nitrogen
cylinder. When the system pressure is
reduced to normal, disconnect the hose from
the cylinder.
NOTICE
Leak Checking
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
Indoor unit
Outdoor unit
Lo Hi
Manifold valve
Pressure
gauge
h The figure can be changed according to model.
42 Multi Air Conditioner
Air Purging and Evacuation
Installation Manual 43
Air Purging and Evacuation
ENGLISH
1. Connect the charge hose end described in
the preceding steps to the vacuum pump to
evacuate the tubing and indoor unit.
Confirm the "Lo" knob of the manifold valve is
open. Then, run the vacuum pump.
The operation time for evacuation varies with
tubing length and capacity of the pump.
The following table shows the time required
for evacuation.
2. When the desired vacuum is reached, close
the "Lo" knob of the manifold valve and stop
the vacuum pump.
Finishing the job
1. With a service valve wrench, turn the valve
stem of liquid side valve counter-clockwise to
fully open the valve.
2. Turn the valve stem of gas side valve counter-
clockwise to fully open the valve.
3. Loosen the charge hose connected to the gas
side service port slightly to release the
pressure, then remove the hose.
4. Replace the flare nut and its bonnet on the
gas side service port and fasten the flare nut
securely with an adjustable wrench. This
process is very important to prevent leakage
from the system.
5. Replace the valve caps at both gas and liquid
side service valves and fasten them tight.
This completes air purging with a vacuum pump.
The air conditioner is now ready for test running.
: Repeat evacuation procedure for each
indoor unit.
NOTICE
Lo Hi
Manifold valve
Vacuum pump
Open
Open
Pressure
gauge
Indoor unit
Outdoor unit
Evacuation
h The figure can be changed according to model.
Required time for evacuation when 30 gal/h
vacuum pump is used
If tubing length is less
than 10m (33 ft)
If tubing length is longer
than 10m (33 ft)
Less than 0.5 Torr Less than 0.5 Torr
44 Multi Air Conditioner
Charging
Important:
If you are ever uncertain of the unit charge, reclaim, evacuate and weigh in the correct charge using
the charge amount specified on the Unit`s specification label.
Multiple Piping Models
Additional charge(oz ) = (Total Installation Piping Length-Standard Total Piping Length) x 0.22
Charging
n If installed total piping length is more than standard total length, additional refrigerant charging is
necessary.
Below standard total piping length, additional refrigerant charging is not required.
18k 50(164) 25(82) 3(9.8) 20(0.22) 15(49.2)
24k 75(246) 25(82) 3(9.8) 20(0.22) 22.5(74)
30k 75(246) 25(82) 3(9.8) 20(0.22) 30(98.4)
Outdoor Unit
Capacity (Btu/h
class)
Max total length of all
pipes (A+B)/(A+B+C)/
(A+B+C+D)
Max length of each
pipe (A/B/C/D)
Min length of each
pipe (A/B/C/D)
Additional Refrigerant
Unit : g/m (oz/ft)
Standard Total Piping
Length (No Add`l
refrigerant)
Unit:m(ft)
Unit:m(ft)
Each branch pipe
a=82ft
b=16ft
c=49ft
❈ Additional Charge
= {(82+16+49)-74} x 0.22 = 16.06 oz
a
b
c
9k
9k
9k
EX) A3UW24GFH0
Multiple Piping Models
Distributor Type Model
Outdoor Unit
Capacity
(Btu/h class)
Main Piping Length Branch Piping Length
Standard Length
Additional
Refrigerant
Unit : g/m (oz/ft)
Standard
Length
Additional
Refrigerant
Unit : g/m (oz/ft)
36k 5(16.4) 50(0.55) 5(16.4) 20(0.22)
42k 5(16.4) 50(0.55) 5(16.4) 20(0.22)
Installation Manual 45
Charging
ENGLISH
h If the total additional charge value after calculation comes out to be negative, then do not consider
additional charge.
A
Ex) A6UW42GFH0
A
B
C
abc
18k 7k 7k
d
e
7k
12k
Distributor type Models
Additional charge (oz) = (( Total Main piping Length - Main Standard Length ) x 0.55
+ (A Room Branch Length – Standard Length ) x 0.22
+ (B Room Branch Length – Standard Length ) x 0.22
+ (C Room Branch Length – Standard Length ) x 0.22 +.. )
- CF(Correction Factor) x 3.53
h CF = Max. number of connectable indoor unit – Total number of connected indoor unit
• Total main pipe(A+B+C)=98ft
• Each branch pipe
a=33ft
b=26ft
c=16.4ft
d=10ft
e=33ft
v Additional Charge
= ((98-16.4)×0.55 + (33-16.4)×0.22
+ (26-16.4)×0.22 + (16.4-16.4)×0.22
+ (10-16.4)×0.22 + (33-16.4)×0.22)
- (6-5)×3.53 = 49.4oz
46 Multi Air Conditioner
Installation PI485
Fix the PI485 PCB as shown in Fig.
Detailed installation method refer to PI485 Installation Manual.
18,24,30kBtu/h class
Th
i
s
la
b
e
l
i
s
s
h
o
uld
b
e
a
pp
l
i
e
d
in
t
h
e
l
o
c
a
t
i
o
n
w
h
e
r
e
Th
is l
a
b
e
l
i
s
sh
ou
ld
be
a
pp
li
e
d
in
t
h
e
l
oc
a
t
i
o
n
w
he
r
e
L
G
AP(
Su
b
PC
B
f
or
C
e
n
t
r
a
l
C
o
n
t
r
o
l
l
e
r
i
s
i
n
s
t
a
l
l
e
d
.
L
G
AP(
Su
b
P
C
B
f
or
C
e
n
t
r
a
l
C
on
t
r
o
l
le
r
i
s
i
n
s
t
a
ll
e
d
.
Pl
e
a
s
e
c
o
n
n
e
c
t
t
h
e
w
i
r
e
a
f
t
e
r
i
n
s
t
a
l
l
i
n
g
t
h
e
L
G
A
P
.
Pl
e
a
s
e
c
o
nn
e
c
t
th
e
w
ire
a
f
t
e
r
i
n
s
t
a
ll
ing
t
h
e
LG
A
P
.
36,42kBtu/h class
T
h
is
i
s
th
e
s
p
a
c
e
f
or
i
ns
t
a
ll
a
t
i
o
n
o
f P
I48
5
G
a
te
w
a
y
.
(
A
c
c
e
s
s
or
y
)
P
le
a
s
e
c
o
n
ne
c
t
t
h
e
w
i
r
e
a
ft
e
r
i
n
s
t
a
ll
i
n
g
P
I
4
8
5
G
a
te
w
a
y.
Screw Hole
Screw Hole
M
E
Z
30
1
7
1
8
0
2
T
h
is
i
s
t
h
e
s
p
a
c
e
f
or
i
ns
t
a
ll
a
t
i
o
n
o
f P
I48
5
G
a
te
w
a
y
.
(
A
c
c
e
s
s
or
y
)
P
le
a
s
e
c
o
n
ne
c
t
t
h
e
w
i
re
a
ft
e
r
i
n
s
t
a
ll
i
n
g
P
I
4
8
5
G
a
te
w
a
y
.
Screw Hole
Screw Hole
M
E
Z
30
1
71
8
0
2
Installation PI485
Installation Manual 47
Test Running
ENGLISH
Prepare remote control
Remove the battery cover by pulling it according
to the arrow direction.Insert new batteries making
sure that the (+) and (–) of battery are installed
correctly. Reattach the cover by pushing it back
vinto position.
Evaluation of the performance
Operate unit for 15~20 minutes, then check the system refrigerant charge:
- Measure the pressure of the gas side service valve.
- Measure the temperature of the intake and discharge of air.
- Ensure the difference between the intake temperature and the discharge is more than 8°C.
- For reference, the gas side pressure of optimum condition is as below.(Cooling)
- Check that all tubing and wiring have been properly connected.
- Check that the gas and liquid side service valves are fully open.
Bolt
Tubing connection
Discharge
temperature
Discharge air
Intake temperature
Discharge
temperature
Discharge air
Intake temperature
Discharge
temperature
Discharge air
Intake temperature
Test Running
:
• Use 2 AAA(1.5volt) batteries. Do not use rechargeable
batteries.
• Remove the batteries from the remote control if the
system is not going to be used for a long time.
NOTICE
:
If the actual pressure are higher than shown, the system is most likely over-charged, and charge
should be removed. If the actual pressure are lower than shown, the system is most likely
undercharged, and charge should be added. The air conditioner is now ready for use.
NOTICE
Refrigerant
Outside
ambient
TEMP.
The pressure of the
gas side service
valve.
R410A 35°C (95°F)
8.5~9.5kg/cm2G
(120~135 P.S.I.G.)
48 Multi Air Conditioner
Function
If you set the DIP Switch when power is on, the change in setting is not applicable. The changing
setting is enabled only when Power is reset.
DIP Switch
Function
1 2 3 4 5
Normal Operation (No Function)
Forced Cooling Operation
Wiring Error Check
Saving Power Consumption (Step 1)
Saving Power Consumption (Step 2)
Mode Lock (Cooling)
Mode Lock (Heating)
Night Quiet Mode (Step 1)
Night Quiet Mode (Step 2)
Mode Lock (Cooling) + Night Quiet Mode (Step 1)
Mode Lock (Cooling) + Night Quiet Mode (Step 2)
Mode Lock (Cooling) + Saving Power Consumption (Step 1)
Mode Lock (Cooling) + Saving Power Consumption (Step 2)
Mode Lock (Heating) + Saving Power Consumption (Step 1)
Mode Lock (Heating) + Saving Power Consumption (Step 2)
12345678910
Function
DIP S/W Setting
WARNING: When you set the dip switch, you should turn off the circuit
breaker or shut the power source of the product down.
CAUTION
• Unless the applicable dip switch is set properly, the product may not
work.
• If you want to set a specific function, request that the installer sets the
dip switch appropriately during installation.
18,24,30kBtu/h class 36,42kBtu/h class
Installation Manual 49
Function
ENGLISH
18,24,30kBtu/h class
SW1
36,42kBtu/h class
DIP-SW01D
12345678910
Adding the refrigerant in winter.
Setting Procedure
1. Set the DIP Switch as follow after shutting the power
source down.
2. Reset the power.
3. Check that the Red LED of PCB is on during work. (The indoor unit is operated by force.)
4 Add the specific amount of refrigerant.
12345678910
CAUTION
• When the green LED of PCB is on, compressor is going to be off because
of low pressure.
• You should return the DIP Switch to operate normally after finishing the
operation.
Forced Cooling Operation
50 Multi Air Conditioner
Function
Saving Power Consumption operation is the function which
enables efficient operation by lowering the maximum power
consumption value.
Setting Procedure
1 Set the DIP Switch as follow after shutting the power
source down.
2 Reset the power.
1 s1 s
1 s
LED1
(Red)
LED1
(Green)
1 s
3
3
2
2
12345678910
12345678910
Power
consumption
and current
Nomal
Time
12345678910
12345678910
Step 1
Step 2
Example)
If the Red LED blinks twice and the Green LED
blinks 3 times, 2nd pipe is connected to 3rd room.
You can check whether or not the wiring is correct.
Setting Procedure
1. Set the DIP Switch as follow after shutting the power source down.
2. Reset the power.
3. Check that the Re and Green LED of PCB are on during work. (The indoor unit is
operated by force.)
4. If the wiring is correct, the Green LED will light up.
If the wiring is wrong, display as below
(Display only wrong connection.)
• Red LED : Piping Number
• Green LED : Wiring Number (Room)
5. You should return the DIP Switch to operate normally after finishing wiring error check.
12345678910
CAUTION
• If Indoor unit doesn’t communicate to outdoor Unit, function could not be
operated correctly.
• Only the wrong wiring connection is displayed. You should change
connection correctly to operate the product.
• If Outdoor and Indoor temperature is too low in winter, the wiring error
check function will not be operated.
(Red LED is lighting)
Wiring Error Check
Saving Power Consumption
Installation Manual 51
Function
ENGLISH
Saving Power Consumption Current level.
Night Quiet Mode operation lowers the noise level of the outdoor unit by changing the comp
frequency and fan speed. This function is operated all night long.
Setting Procedure
1. Set the DIP Switch as follow after shutting the power source down.
2. Reset the power.
Night Quiet Mode with Mode Lock.
Saving Power Consumption with Mode Lock.
12345678910
12345678910
12345678910
12345678910
Phase 1Ø
Model 18,24,30kBtu/h class 36,42kBtu/h class
Step1(A) 12 22
Step2(A) 10 21
Saving Power
Consumption (step 1)
+ Mode Lock (Cooling)
Saving Power
Consumption (step 2)
+ Mode Lock (Cooling)
Saving Power
Consumption (step 1)
+ Mode Lock (Heating)
Saving Power
Consumption (step 2)
+ Mode Lock (Heating)
12345678910
12345678910
Mode Lock (Cooling) +
Night Quiet Mode (step 1)
Mode Lock (Cooling) +
Night Quiet Mode (step 2)
12345678910
12345678910
Step 1 Step 2
h Noise level :
Step 1 > Step 2
Night Quiet Mode
CAUTION
• If comp frequency and fan speed are down, the cooling capacity may
decrease accordingly.
• This function is only available for Cooling Mode.
• If you want to stop the Night Quiet Mode, Change the DIP Switch.
• If operating indoor unit is set by the fan speed “Power”, Night Quiet
Mode will be stopped until fan speed “Power” is changed.
52 Multi Air Conditioner
Function
Setting Procedure
1. Set the DIP Switch as follow after shutting the power source down.
2. Reset the power.
Mode Lock with Night Quiet Mode
Saving Power Consumption with Mode Lock.
12345678910
Mode Lock (Cooling)
+ Night Quiet Mode
(step 1)
Mode Lock (Cooling)
+ Night Quiet Mode
(step 2)
12345678910
12345678910
Mode Lock (Cooling)
+ Saving Power
Consumption (step 1)
Mode Lock (Heating)
+ Saving Power
Consumption (step 1)
12345678910
12345678910
12345678910
12345678910
Mode Lock (Cooling)
+ Saving Power
Consumption (step 2)
Mode Lock (Heating)
+ Saving Power
Consumption (step 2)
12345678910
12345678910
Only Cooling Mode Only Heating Mode
12345678910
Mode Lock
Installation Manual 53
Function
ENGLISH
It is useful to check the cycle data without LGMV.
Operating Method
Whenever you push the Tact Switch, the cycle information will be shown as below.
h After 1page is displayed, subsequently 2page is displayed.
Tact S/W Item
Display
Example 1page 2page
1 time Low Pressure 890kpa ‘LP’ ’ 89’
2 time Hi Pressure 2900kpa ‘HP’ ‘290’
3 time Discharge Temp. 85°C ‘DS’ ’ 85’
4 time Cond Out Temp. -10°C ‘CS’ ‘-10’
5 time Suction Temp. -10°C ‘SS’ ‘-10’
6 time ODU Air Temp. -10°C ‘AS’ ‘-10’
7 time Current 15A ‘A’ ‘ 15’
8 time Voltage 230V ‘V’ ‘230’
9 time Comp Hz 100Hz ‘F’ ‘100’
10 time DC Link Voltage 230V ‘dc’ ‘230’
TACT-SW1
PCB Display(36,42kBtu/h class Model Only)
WARNING : When you push the Tact Switch, use the material non-
conducting electricity.
54 Multi Air Conditioner
Max Combination Capacity
Max Combination Capacity
Multi Piping Type
Capacity
(Btu/h class)
Max Room No.
Combination Indoor Capacity
(Btu/h class)
Max Combination Capacity
(Btu/h class)
18k 2 7,9,12,15k 24k
24k 3 7,9,12,15,18,24k 33k
30k 4 7,9,12,15,18,24k 40k
Distributor Type
Capacity
(Btu/h class)
Max Room No.
Combination Indoor Capacity (Btu/h
class)
Max Combination Capacity
(Btu/h class)
36k 5 7,9,12,15,18,24k 48k
42k 6 7,9,12,15,18,24,36k 56k
The combination of indoor unit is to be decided that the sum of indoor unit capacity index must be
smaller than the maximum combination capacity of outdoor unit. We recommend to calculate indoor
unit capacity like below.
If you do not follow our recommendation, it will have some problems in low ambient condition i.e.
some indoor unit will not be able to heat very well in heating mode.
CALCULATION METHOD FOR THE CONNECTABLE TOTAL CAPACITY OF INDOOR UNIT
Sum up the capacity of all indoor unit, but high static duct and VAHU type indoor unit capacity
multiplier 1.2 times in which multiplier is unless only HSD/VAHU are connected
Ex) 1. Outdoor unit : A6UW42GFH0[LMU420HHV](connectable maximum capacity is 56kBtu/h class)
Indoor unit:
AMNW24GBGA0[LMHN240HV], AMNW36GBGA0[LMHN360HV]
(24+36) x 1.2 = 60 x 1.2 = 72kBtu/h class : This combination is not acceptable.
2. Out door unit: A6UW42GFH0[LMU420HHV](connetable maximum capacity is 56kBtu/h class)
Indoor unit:
AMNW24GBGA0[LMNH240HV], AMNW24GDCB0[LMN248HVT]
(24 x 1.2) + 24 =52.8kBtu/h class : This combination is acceptable.
3. Outdoor unit : A6UW42GFH0[LMU420HHV](connectable maximum capacity is 56kBtu/h class)
Indoor unit:
AMNW36GBGA0[LMNH360HV], AMNW07GDBB0[LMN078HVT]
(36 x 1.2) + 7 =50.2kBtu/h class : This combination is acceptable.
