LG 20k User manual

LG Floor Standing Type
Air Conditioner
INSTALLATION MANUAL
LG
website http://www.lgservice.com
e-mail http://www.lgeservice.com/techsup.html
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.
P/No.: 3828A20025V

2Floor Standing type Air Conditioner
Floor Standing Type Air Conditioner Installation Manual
TABLE OF CONTENTS
Safety Precautions..........................................................................................3
Installation of Indoor, Outdoor Unit ..............................................................6
1) Selection of the best location.................................................................................................................................6
2) Indoor Unit Installation ...........................................................................................................................................8
3) Outdoor unit installation .........................................................................................................................................8
4) Refrigerant amount ................................................................................................................................................8
5) Installation guide at the seaside ............................................................................................................................9
6) Installation method procedure..............................................................................................................................10
7) Preparation of installation parts and tools ...........................................................................................................11
8) Preparation of piping............................................................................................................................................12
9) Connection of piping ............................................................................................................................................13
10) Precautions in bending ......................................................................................................................................13
11) Connecting the cable to the indoor unit.............................................................................................................14
12) Connecting the piping to the outdoor unit..........................................................................................................15
13) Connecting the cable to the outdoor unit...........................................................................................................15
14) Power supply and wiring ....................................................................................................................................16
15) Vacuum drying of the connecting pipes and the indoor unit..............................................................................17
16) Form the pipe.....................................................................................................................................................18
Final Check and Test Run ..........................................................................................19
OUT-LINE OF INSTALLATION

Safety Precautions
Installation Manual 3
To prevent injury to the user or other people and property damage, the following instructions
must be followed.
■ 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.
WARNING
CAUTION
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage.
WARNING
Be sure not to do.
Be sure to follow the instruction.
Safety Precautions
■Installation
Install the panel and the cover of
control box securely.
• There is risk of fire or
electric shock.
Always install a dedicated
circuit and breaker.
• Improper wiring or
installation may cause fire or
electric shock
Use the correctly rated breaker
or fuse.
• There is risk of fire or
electric shock.
Do not use a defective or
underrated circuit breaker. Use
this appliance on a dedicated
circuit.
• There is risk of fire or
electric shock.
For electrical work, contact the
dealer, seller, a qualified
electrician, or an Authorized
Service Center.
• Do not disassemble or repair
the product. There is risk of
fire or electric shock.
Always ground the product.
• There is risk of fire or
electric shock.

4Floor Standing type Air Conditioner
Safety Precautions
Do not modify or extend the power cable.
• There is risk of fire or electric shock.
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 conditioner could fall with
it, causing property damage, product failure, and
personal injury.
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.
Do not store or use flammable gas or combustibles
near the product.
• There is risk of fire or failure of product.
■Operation
Gasolin

Safety Precautions
Installation Manual 5
Always check for gas (refrigerant) 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 properly.
• 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 outdoor 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 condenser and
evaporator fins, could cause product
malfunction or inefficient operation.
CAUTION
90˚
■Installation

6Floor Standing type Air Conditioner
Installation of Unit
Installation of Unit
1. Indoor unit
•There should not be any heat source or
steam near the unit.
•There should not be any obstacles to
prevent the air circulation.
•A place where air circulation in the room
will be good.
•A place where drainage can be easily
obtained.
•A place where noise prevention is taken
into consideration.
•Do not install the unit near the door way.
•Ensure the spaces indicated by arrows
from the wall, ceiling, or other obstacles.
•The indoor unit must keep the
maintenance space.
2. Outdoor unit
•If an awning is built over the unit to prevent
direct sunlight or rain exposure, be careful
that heat radiation from the condenser is
not restricted.
•There should not be any animals or plants
which could be affected by hot air
discharged.
•Ensure the spaces indicated by arrows
from the wall, ceiling, fence or other
obstacles.
Selection of the best location
40cm
40cm
5cm
100cm
More than
50cm
Fence or
obstacles
More than 100cm
More than 50cm
More than
30cm
More than
50cm
Sunroof

Installation of Unit
Installation Manual 7
3. Piping length and the elevation
CAUTION:
•Capacity is based on standard length and maximum allowance length is on
the basis of reliability.
•Oil trap should be installed every 5~7 meters.
20k/28k/30k/40k 5/8" 3/8" 30 20
44k/48k/50k/55k/60k 3/4" 3/8" 40 25
80k 1" 5/8" 50 30
PIPE SIZE
MODEL
(BTU/h)
GAS SIDE LIQUID SIDE
Max.
Length
A (m)
Max.
Elevation
B (m)
A
B
Indoor unit
Outdoor unit

8Floor Standing type Air Conditioner
Installation of Unit
The Indoor Unit Installation
Outdoor unit Installation
200mm
70mm 70mm
90mm
Wall
Core Drill
Tilt
Cut if necessary
More than 15mm
Wall
Plastic tube
(Bushing)
INSIDE OUTSIDE
1. The mounting floor should be strong and solid
enough to prevent it from vibration.
2. Drill the piping hole with 70mm diameter hole-
core drill at either the right or the left of indoor
unit. The hole should be sightly slant to the
outdoor side.
3. Insert the plastic tube through the hole.
4. Cut the extruded outside part of the plastic
tube, if necessary.
1. Install the outdoor unit on the concrete or any solid base securely and horizontally by securing it
with bolts (Ø12mm) and nuts.
2. If there is any vibration transmitted to the building, mount the rubber underneath the outdoor unit.
Refrigerant amount
Before shipment, this air conditioner is filled
with the rated amount of refrigerant including
additional amount required for air-purging,
subject to 7.5m piping length. (The rated
amount of refrigerant is indicated on the name
plate.) But when the piping length exceeds 7.5
meters, additional charge is required according
to the following table.
Example) 28k/30k
In case of 10m long pipe(one-way), the amount
of refrigerant to be replenished is:
(10-7.5) x 30 = 75g
(10-7.5) x 1.06 = 2.65oz
REFRIGERANT CHARGE
30g/m (1.06oz/m)
40g/m (1.41oz/m)
80g/m (2.82oz/m)
MODEL
20k/28k/30k/40k
(BTU/h)
44k/48k/50k/55k/60k
(BTU/h)
80k
(BTU/h)

Installation of Unit
Installation Manual 9
Installation guide at the seaside
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 malfunc-
tion or inefficient performance.
3. If outdoor unit is installed close to the seaside, it should avoid direct exposure to the sea wind. Otherwise it
needs additional anticorrosion treatment on the heat exchanger.
1. If you can’t meet above guide line in the seaside installation, please contact LG Electronics for the additional anticorrosion treatment.
2. Periodic ( more than once/year ) cleaning of the dust or salt particles stuck on the heat exchanger by using water
Selecting the location(Outdoor Unit)
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 windbreak not to be exposed to the sea wind.
3. Select a well-drained place.
•It should be strong enough like concrete to prevent
the sea wind from the sea.
•The height and width should be more than 150% of
the outdoor unit.
•It should be keep more than 70 cm of space
between outdoor unit and the windbreak for easy
air flow.
Sea wind Sea wind
Sea wind
Windbreak
CAUTION

10 Floor Standing type Air Conditioner
Installation of Unit
Installation Method
No. Installation works Descriptions
1 Preparation of tools and installation parts Preparation of installation
2 Flaring the pipes To insert the flare nuts, mounted on the
connection parts of both indoor and
outdoor unit, onto the copper pipes.
3 Pipe bending To reduce the flow resistance of refrigerant.
4 Connection of installation parts Connection of long piping
(elbows, socket etc)
5 Tighten the flare nut (outdoor) Connecting the pipings of the outdoor unit.
6 Blowing the pipings To remove dust and scale in working.
7 Tighten the flare nut (indoor) Connecting the pipings of the indoor unit.
8 Check a gas-leakage of the connecting
part of the pipings.
9 Vacuum drying of the piping and indoor unit The air which contains moisture and which
remains in the refrigeration cycle may cause a
malfunction on the compressor
10 Open the 3-way (liquid side) and
3-way (gas side) valves.
11 Form the pipings To prevent heat loss and sweat
12 Checking the drainage (indoor unit) To ensure if water flow drain hose of indoor unit.
13 Connecting the cable between outdoor Preparation of the operating
and indoor unit
14 Connecting the main cable to outdoor unit
15 Supply the power to the crankcase heater To prevent the liquid back to the compressor.
(Before the operating the unit) (Heat pump only)
16 Cooling operation
(Use the remote control or display of the
indoor unit)

Installation of Unit
Installation Manual 11
Preparation of installation parts and tools
No. Installation Parts, Tools Use
1 Flaring tool (Ø6.35 - Ø19.05) Flaring the pipes
2 Remear Remove burrs from cut edges of pipes.
3 Pipe cutter (MAX 35mm Copper pipe) Cutting the pipings
4 Wrench (H5, H4 hexagonal wrench) To open the service valve
5 Pipe bender Bending the pipings
6 Leak detector Check a gas-leakage of connecting part
of the pipings
7 Manifold gauge To measure the pressure, to charge the refrigerant
8 Charge-nipple To connect the bombe
9 Vacuum pump To remove the air in the pipe.
10 Charge cylinder balance To measure the refrigerant amount
11 Bombe (Freon-22) Gas charge
Cleaning the pipe
12 Spanner To tighten the connecting parts of the pipings
13 Monkey spanner
14 Driver( , )
15 Benchi (150mm) Cutting the wires
16 Tapeline To measure the length
17 Core drill To make holes through the concrete wall and blocks
18 Voltmeter, Amperemeter, Clampmeter To measure the current and voltage
19 Insulation resistance tester To measure the insulation resistance
20 Glass thermometer
To measure the intake and outlet air temperature of the indoor unit
21 Copper tubes To use the connecting pipings
22 Insulation material To cover the connecting pipings
23 Tape To finish the connecting pipings
24 Electrical Leakage Breaker To shut off the main power
25 Cable To connect the cable from outdoor unit to indoor unit
26 Drain hose sockets, elbows To remote the condensing water

12 Floor Standing type Air Conditioner
Installation of Unit
Preparation of Piping
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.
•Use the accessory piping kit or the pipes
purchased locally.
•Measure the distance between the indoor
and the outdoor unit.
•Cut the pipes a little longer than measured
distance.
•
Cut the cable 1.5m longer than the pipe
length.
2. Burrs removal
•Completely remove all burrs from the cut
cross section of pipe/tube.
•
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
•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
• Carry out flaring work using dedicated
flaring tool for R-22 as shown below.
Firmly hold copper tube in a bar(or die) as
indicated dimension in the table above.
5. Check
•Compare the flared work with figure below.
•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
Ø6.35 1/4 1.1~1.3
Ø9.52 3/8 1.5~1.7
Ø12.7 1/2 1.6~1.8
Ø15.88 5/8 1.6~1.8
Ø19.05 3/4 1.9~2.1

Installation of Unit
Installation Manual 13
Connection of piping
•Align the center of the pipings and suffciently
tighten the flare nut with fingers.
•Finally, tighten the flare nut with troque
wrench until the wrench clicks.
When tightening the flare nut with troque
wrench, ensure the direction for tightening
follows the arrow on the wrench.
1. If it is necessary to bend or stretch the
tubing, use the spring which is attached to
the tubing in stead of pipe bender.
•Please make a careful notice to make a
smooth line.
•Hold the tubing with your two hands closely
and then bend or stretch it slowly not to
make any crack.
•Remember that the radius (R) should not
exceed 70mm (Refer to Fig. 1)
2. Do not repeat the bending process to prevent
the tubing from cracking or crushing.
3. Keep in mind that the bending part should
not be cracked and make the radius (R) as
long as possible (Refer to Fig. 2)
1. Move the indoor tubing and drain hose to the hole
•Remove tubing holder and pull the tubing out of the chassis.
2. Replace the tubing holder into original position
3. Route the tubing and the drain hose staight backwards.
4. Insert the connecting cable into the indoor unit through the hole.
•Do not connect the cable to the indoor unit
•Make a small loop with the cable for easy connection later.
5. Tape the tubing and the connecting cable.
6. Indoor unit installation.
7. Connecting the pipings to the indoor unit.
Precautions in bending
Indoor unit tubing Flare nut Pipings
Torque wrench
Spanner
Spring
R70mm
(Fig. 1)
(Fig. 2)
R
PIPE SIZE TORQUE
1/4" 1.8~2.5 kgf·m
3/8" 3.4~4.2 kgf·m
1/2" 5.5~6.6 kgf·m
5/8" 6.3~8.2 kgf·m
3/4" 9.9~12.1 kgf·m

14 Floor Standing type Air Conditioner
Installation of Unit
Connecting the Cable to Indoor Unit
•The inside and outside connecting cable can be connected after opening the inlet grille.
543 2(N)1(L) 765 4(L2)3(L1) 543 2(N)1(L)
(America, Canada only)
Outdoor unit Outdoor unitOutdoor unit
Insert the plastic tube
(America, Canada only)
1. Open the inlet grille manually.(Fig.1)
2. Open the terminal block cover with driver( ).
3. Connect the cables(LG doesn't sypply) to the Terminal Block in the front Bracket. (Fig.2)
4. Secure the terminal block cover to the original position with the screw.
5. Insert the plastic tube(Bushing)in small hole in order to prevent the connecting wires
from being cut by sharp edge of the hole. (Fig. 3) , America, Canada only.
6. Close the inlet grille.
(Fig.1)
(Fig.3)
Detail Wiring of Fig.2
1. Cooling Model 2. Heating Model
(Fig.2)

Installation of Unit
Installation Manual 15
Connecting pipings to the outdoor unit .
1. Align the center of the pipings and
sufficiently tighten the flare nut with fingers.
2. 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.
1. Open the control board cover from the
outdoor unit by removing the screws.
2. Connect wires to the terminals on the control
board individually and secure the cables
onto the control board with clamp.
3. Secure the control board cover to the
original position with the screws.
CAUTION: Perform grounding
•This product should be grounded.
•Defective grounding could cause an
electric shock.
Gas side piping
Liquid side piping
Torque wrench
Outdoor unit
Connecting the cables to the outdoor unit
4(L2)Terminals on the indoor unit 3(L1) 675
4(L2)
Terminals on the outdoor unit
POWER INPUT
3(L1)2(L2)1(L1) 5
(America, Canada Only)
(America, Canada Only)
PIPE SIZE TORQUE
1/4" 1.8~2.5 kgf·m
3/8" 3.4~4.2 kgf·m
1/2" 5.5~6.6 kgf·m
5/8" 6.3~8.2 kgf·m
3/4" 9.9~12.1 kgf·m

16 Floor Standing type Air Conditioner
Installation of Unit
Power Supply and Wiring
The unit is completely wired internally at the
factory according to general rule of electrical
technology, but local rules, if they are required,
should be complied with.
1. Power supply
Power source must fulfill the following
conditions:
•The working voltage should be higher than
90% and lower than 110% of the rated
voltage marked on the name plate.
•The starting voltage should be higher than
85% of the rated voltage marked on the
name plate.
Voltage
Time
Starting point
Power source voltage
working voltage
Starting voltage
•Use the power supply cord(Rubber
insulation, type Ho7RNF approved by HAR
or SAA) suitable for the product's
electriccal capacity.
•Provide a recognized circuit breaker as
below between power source and unit.
A disconnection device to adequately
disconnect all supply lines must be fitted.
(for service operations)
•The screws 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.)
•See to it that the starting voltage is
maintained at more than 90 percent of the
rated voltage marked on the name plate.
•The following troubles would be caused by
voltage drop-down.
Vibration of a magnetic switch, damage on
the contact point there of, fuse breaking,
disturbance to the normal function of a
overload protection device.
*Separate main and heater power supply for
Z model. (Do not connect together to the
same power supply)
2. Wiring
After the confirmation of the above conditions, prepare the wiring as follows:
H/P 450/750V 4.0mm2
C/O
450/750V 4.0mm2
H/P 450/750V 5.5mm2
C/O 450/750V 5.5mm2
H/P 450/750V 8.0mm2
C/O 450/750V 8.0mm2
Conductor
cross-sectional area
20k/28k/
30k/40k
44k/48k/
50k
80k
UNIT (BTU/h)
Circuit breaker capacity
H/P 30A
C/O 30A
H/P 40A
C/O 40A
H/P 30A
C/O 30A
H/P 50A
C/O 50A
20K/28K/
30K/40K
44K/48K/
55K/60K
44K/48K/
50K/60K
80K
1 Phase
3 Phase
Heater
Wiring
Spec.
Unit (BTU/h) Breaker Conductor
20k/28k
30k/40k
44k/48k
50k/60k
80k
30A
40A
50A
3.5mm2
5.5mm2
8mm2
VOLTS
UNIT
(BTU/h)

Installation of Unit
Installation Manual 17
Vacuum Drying of the Connecting Pipes and the Indoor Unit
The air which contains moisture remaining in the refrigeration cycle may cause a malfunction on the
compressor.
1. Confirm that both the liquid side valve and the gas side valve are set to the closed position.
2. After connecting the piping, check the joints for gas leakage with gas leak detector.
3. Remove the service port nut, and connect the gauge manifold and the vacuum pump to the service
port by the charge hose.
4. Vacuum the indoor unit and the connecting pipes until the pressure in them lowers to below -
76cmHg.
5. Remove the valve stem nuts, and fully open the stems of the 2-way and 3-way valves with a hexagon
wrench.
6. Tighten the valve stem nuts of the 2-way valve and 3-way valve.
7. Disconnect the charge hose and fit the nut to the service port.
(Tightening torque: 1.8kg.m)
Indoor unit
Outdoor unit
Liquid side
CLOSEOPEN
Vaccum pump
Gas side
Closed
Closed
2-way valve/
3-way valve
3-way
valve

18 Floor Standing type Air Conditioner
Installation of Unit
Form the Piping
1. Wrap the connecting portion of indoor unit
with the insulation material and secure it with
two Plastic Bands. (for the right piping)
•If you connect an additional drain hose,
the end of the drain-outlet should be kept
distance from the ground. (Do not dip it
into water, and fix it on the wall to avoid
swinging in the wind.)
2. Tape the Piping, and Connecting Cable from
down to up.
3. Form the piping gathered by taping along the
exterior wall and fix it onto the wall by saddle
or equivalent.
1. Tape the piping and connecting cable from
down to up.
2. In order to prevent water from entering the
room, form a trap and tape the piping.
3. Fix the piping onto the wall with saddle or
bracket.
1. When using the drain elbow hose, use
a mount of 3cm of higher.
2. In the cold district (0°c(32°F) continued for 2~3
day), the drain water is frozen and the fan fail
to function, do not use the drain elbow.
In case of the outdoor unit is installed below
position of the indoor unit.
In case of the outdoor unit is installed upper
position of the indoor unit.
Drain water treatment of outdoor unit(Heat
Pump Only)
Trap
Drain elbow
Hose(inner diameter ø20)
Arrange the hose downward slope without waving.
Trap
Seal a small opening around
the piping with gum type sealer.
Gas side
piping
Main cable
Tube PE
Foam
Connecting
Cable
(For heater)
Connecting
Cable
Trap is required to prevent the electrical parts
from entering the water.

Final Check and Test Run
Installation Manual 19
After installing the unit, perform the final check
and running test as follows:
Final check points
Is the unit securely mounted?
Is the installation location adequate?
Is the water piping work adequately and
without leakage?
Are trapped drain lines installed at
condensate drain connections?
Has the refrigeration cooling cycle been
kept sealed?
Is the electrical wiring adequate and are
the screws tightened on terminals?
After the above final checkings, prepare the
running test as follows:
Connect compound gauges to the check
joints at discharge and suction sides of
the compressor.
Turn all switches "OFF".
Turn the main switch "ON".
Running test should be accomplished as follows:
Set operation switch at "FAN" and the fan
will start. Check to ensure that the fan
sounds normal.
Next, set it at "COOL" and the
compressor will start. Check to ensure
that the compressor sounds normal.
Check discharge and suction pressure on
the compound gauges.
Check working voltage, phase balance
and running current.
Check to ensure that the thermistor
functions properly.
Check to ensure that the high pressure
control switch functions correctly.
Final Check and Test Run

20 Floor Standing type Air Conditioner
Memo