LG UU37W INSTALLATION INSTRUCTIONS

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

TYPE : Standard inverter

www.lg.com

Copyright © 2015 - 2019 LG Electronics Inc. All Rights Reserved.

MFL69190205

Rev.01_051719

ENGLISH

РУССКИЙ ЯЗЫК

УКРАÏНСЬКА

ҚАЗАҚ ТІЛІ

беларуская мова

O‘ZBEK TILI

Table of contents

TABLE OF CONTENTS

3 SAFETY PRECAUTIONS

6 INSTALLATION OF OUTDOOR UNIT

9 Night Silent Operation setting

10 WIRING CONNECTION

10 Electrical Wiring

10 Connecting Cables between Indoor Unit and Outdoor Unit

12 Connecting the cable to Outdoor Unit

13 CONNECTING PIPES

13 Preparation of Piping

14 Connecting the pipes to the Outdoor unit

16 Forming the piping

17 LEAKAGE TEST AND EVACUATION

17 Preparation

17 Leakage test

18 Evacuation

19 TEST RUNNING

21 FUNCTION

21 Forced Cooling Operation

22 SELF-DIAGNOSIS FUNCTION

22 Error Indicator (Outdoor)

23 INSTALLATION GUIDE AT THE SEASIDE

2 Air Conditioner

Safety Precautions

Safety Precautions

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.

ENGLISH

!

WARNING

!

CAUTION

n The meanings of the symbols used in this manual are as shown below.

This symbol indicates the possibility of death or serious injury.

This symbol indicates the possibility of injury or damage to properties only.

Be sure not to do.

Be sure to follow the instruction.

!

WARNING

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.

• 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.

Installation Manual 3

Safety Precautions

- There is the risk of death, injury, fire or explosion.

• Do not install the product at a place that there is concern of falling down.

- Otherwise, it may result in personal injury.

• Use caution when unpacking and installing.

- Sharp edges may cause injury.

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.

4 Air Conditioner

Safety Precautions

!

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.

• Means for disconnection must be incorporated in the fixed wiring in accordance with the wiring
rules.

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.

ENGLISH

Installation Manual 5

More than
300 mm

Installation of Outdoor Unit

Installation of Outdoor Unit

1. Installation Places

• 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.

• Ensure that the spaces indicated by arrows
around front, back and side of the unit.

More than
300 mm

• Do not place animals and plants in the path of
the warm air.

• Take the air conditioner weight into account

Fence or

obstacles

and select a place where noise and vibration
are minimum.

• Select a place so that the warm air and noise
from the air conditioner do not disturb
neighbors.

2. Piping length and the elevation

n Single Operation

Pipe Size

Model Capacity

UU18W 5 kW Ø 12.7(1/2) Ø 6.35(1/4) 7.5 40 5 30 20
UU24W 7 kW Ø 15.88(5/8) Ø 9.52(3/8) 7.5 50 5 30 40

UU30W 8 kW Ø 15.88(5/8) Ø 9.52(3/8) 7.5 50 5 30 40
UU36W/UU37W 10 kW Ø 15.88(5/8) Ø 9.52(3/8) 7.5 50 5 30 40
UU42W/UU43W 12.5 kW Ø 15.88(5/8) Ø 9.52(3/8) 7.5 75 5 30 40
UU48W/UU49W 14 kW Ø 15.88(5/8) Ø 9.52(3/8) 7.5 75 5 30 40
UU60W/UU61W 15 kW Ø 15.88(5/8) Ø 9.52(3/8) 7.5 75 5 30 40

mm(inch)

Gas Liquid Standard Max. Standard Max.

Length A(m) Elevation B(m)

Sunroof

More than 700 mm

More than

More than
300 mm

300 mm

More than 600 mm

Unit : mm

Additional
refrigerant

(g/m)

If installed tube is shorter than 7.5 m, additional charging is not necessary.
Additional Refrigerant = (A-7.5)xAdditional refrigerant (g)

6 Air Conditioner

Indoor unit

B

A

Outdoor unit

Indoor unit

Outdoor unit

A

B

Installation of Outdoor Unit

Indoor Unit Refrigerant Additional charging (g)

Duo

Trio

Quartet

Refrigerant = (L1-b)xB+(L2+L3)xC

Refrigerant = (L1-b)xB+(L2+L3+L4)xC

Refrigerant = (L1-b)xB+(L2+L3+L4+L5)xC

C

(g/m)

Pipe Size
mm(inch)

Ø 6.35(1/4)

Ø 9.52(3/8)

35

40

b

(m)

Model

UU42W/UU43W
UU48W/UU49W
UU60W/UU61W

B

(g/m)

7.5 40

n Synchro Operation

Install the branch pipe so that pipe length and difference between high and low will not exceed
below Spec.

L2

L3

L4

L5

H1

Remote

Controller

L1

Branch

A

A

Pipe Length & Height

Total(L1+L2+L3+L4+L5)

Main Pipe(L1)

H2

Branch Pipe (L2+L3+L4+L5)

Each

Indoor-Outdoor (H1)

Indoor-Indoor (H2)

(L1+L2),(L1+L3),(L1+L4),(L1+L5)

A

[Unit : m]

Spec(MAX.)

80

45

40

15

30

1

70

10

• When installing the branch pipe, direction and angle of installation is not limited.

• Take care so that burrs and foreign material may not enter into the cutting surface when
connecting.

• Connect remaining those by cutting or direct insertion to the diameter of pipe.

n Refrigerant Additional Charging Method

For additional charging method, see below table.

ENGLISH

NOTICE

b : Rated performance for refrigerant line length.
C : Additional charging Refrigerant of Branch Liquid Pipe.
B : Additional charging Refrigerant of Main Liquid Pipe.

!

CAUTION

• Capacity is based on standard length and maximum allowance length is on the basis of

• Improper refrigerant charge may result in abnormal cycle.

reliability.

Installation Manual 7

Installation of Outdoor Unit

SW01B

LED01H

DIP SW2

A

B

MAIN PCBMAIN PCB

UU42W/48W/60W UU43W/49W/61W

LED01G
LED02G

SW02N

SW01N

B

A

LED01M
LED02M

6

ODU

BD

IDU IDU

REMO

ODU

BD

IDU IDU IDU

REMO

BD

IDU IDU IDU IDU

ODU

REMO

3. Synchro Combination table

Possible combination of indoor units

Synchro

Duo Trio Quartet

IDU : INDOOR UNIT
ODU : OUTDOOR UNIT
BD : BRANACH

DISTRIBUTOR UNIT

REMO : WIRED

REMOTE
CONTROLLER

MODEL

UU42W/UU43W
UU48W/UU49W
UU60W/UU61W

Bdunit PMUB11A PMUB111A PMUB1111A

Applied

Accessi

ries

NOTICE

Simple central
controller**

Cassette

CT24 NP2R0 CB24 NH2R0 CV24 NJ2R0 CT18 NQ2R0 CB18 NH2R0 CV18 NJ2R0 CT12 NR2R0 - ­CT24 NP2R0 CB24 NH2R0 CV24 NJ2R0 CT18 NQ2R0 CB18 NH2R0 CV18 NJ2R0 CT12 NR2R0 - -

UT30W NP2R0

UB30 NG2R0 UV30 NJ2R0 CT18 NQ2R0 CB18 NH2R0 CV18 NJ2R0 CT12 NR2R0 - -

** When using synchro operation,

- Do not use wireless remote controller.

- Use only one wired remote controller in the indoor units.

- Use Simple central controller "PQCSZ250S0" only.

Duct

Ceiling

Cassette

Suspended

Duct

PQCSZ250S0

Ceiling

Suspended

Cassette

Duct

Ceiling

Suspended

4.

Outdoor Unit PCB Setting Procedure For Simultaneous Operation System

1. SW01N (PIP SW2) Setting

Set the SW01N (PIP SW2) as below Table (Ⓐ)

2. Auto Addressing Method
Addressing work assigns address to each indoor unit. When firstly installing product or replacing
the indoor unit PCB. Auto Addressing work should be done for simultaneous operation.

h Work procedure

1) Set SW01N (PIP SW2) correctly.

2) Turn on main power.

3) Press the SW02N (SW01B) for about 3 seconds within 3 minutes After main power on.(Ⓑ)

8 Air Conditioner

Installation of Outdoor Unit

SW01N (PIP SW2)

Indoor Unit No.

2(Duo)

1(Single)
: Default

3(Trio)

4(Quartet)

Table SW01N (PIP SW2) Setting

DIP SW2

6

SW01N

SW01N

6

4) After step 3), the LED01M/G (red LED) and
LED02M/G (green LED) rapidly flickers.
When Addressing work is done, green LED is
off, else LED (LED01M/G) stops flickering
and lights continuously. Address of indoor
unit is indicated on the wired remote control
display window. (CH01, CH02, CH03, CH04)

5) Press button to turn on the indoor.

6) If you fail to perform the Addressing work,
repeat step 2)~5).

Night Silent Operation setting

1. Open the Side panel or Top Cover of outdoor unit.

2. Set the SW01N (PIP SW2).

UU18W
UU24W
UU30W

UU36W
UU42W
UU48W
UU60W

ENGLISH

UU37W
UU43W
UU49W
UU61W

3. Close the Side panel or Top Cover.

UU18W
UU24W
UU30W

UU36W
UU42W
UU48W
UU60W

UU37W
UU43W
UU49W
UU61W

Installation Manual 9

Wiring Connection

Outdoor

Indoor

Main
power source

Switch box

ELCB

2(N)31(L)S CN-REMO

CN-REMO

CN-REMO

Terminals on the indoor unit 4

2(N)31(L)S

Terminals on the indoor unit 3

2(N)31(L)S

Terminals on the indoor unit 2

2(N)31(L)M

Terminals on the indoor unit 1

Terminals on the
Outdoor unit

2(N)31(L)

Remote
Controller

CN-REMO

2(N)31(L)

2(N)31(L)

2(N)31(L)

2(N)

3

4

4

4

4

5

5

5

5

1(L)

• When using simultaneous Operation System,
use only one wired remote controller
in the indoor units

Simultaneous
Operation Unit 2, 3, 4

Main Unit1

POWER INPUT

(220 V-240 V~)

LN

2(N)31(L)

CSTDUCT, CVT

1(L) 2(N) 1(L) 2(N) 31(L) 2(N) 1(L) 2(N) 3 RS TN 1(L) 2(N) 3

POWER SUPPLY TO INDOOR UNITPOWER SUPPLY TO INDOOR UNIT POWER SUPPLY TO INDOOR UNIT

UU18W UU24W/30W/36W/42W/48W/60W UU37W/43W/49W/61W

Wiring Connection

Electrical Wiring

Perform the electrical wiring work according to the electrical wiring connection.

• All wiring must comply with local requirements.
Select a power source that is capable of

•
supplying the current required by the air
conditioner.

• Use a recognized ELCB(Electric Leakage
Circuit Breaker) between the power source and
the unit. A disconnection device to adequately
disconnect all supply lines must be fitted.

• Model of circuit breaker recommended by
authorized personnel only

Model Phase(Ø ) ELCB
UU18W
UU24W
UU30W
UU36W

UU42W/UU48W/UU60W

UU37W

UU43W/UU49W/UU61W

1 20 A
1 30 A
1 30 A
1 40 A
1 40 A
3 20 A
3 20 A

Connecting Cables between Indoor Unit and Outdoor Unit

•

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

10 Air Conditioner

The power cord

connected to the outdoor unit should be complied
withIEC 60245 or HD 22.4 S4 (This equipment shall be provided with a
cord set complying with the national regulation.

The connecting cable connected to the outdoor unit should be
complied with IEC 60245 or HD 22.4 S4 (This equipment shall be
provided with a cord set complying with the national regulation.)

If the supply cord is damaged, it must be replaced by a special cord or assembly availible from the manufacturer of its service agent.

NORMAL
CROSS-SECTIONAL
AREA 0.75 mm

2

When the connection line between the indoor unit and
outdooor unit is over 40 m, connect the telecommunication
line and power line separately.

20 mm

GN/YL

35±5 mm

10±3 mm

GN/YL

20 mm

35±5 mm

10±3 mm

Round pressure terminal

Power wire

Outdoor

unit

Indoor

unit

1

2

3

1

2

3

!

CAUTION

Model Phase(Ø ) Area(mm2)

UU18W/24W/30W

UU36W/UU42W
/UU48W/UU60W

UU37W/UU43W
/UU49W/UU61W

u

Precautions when laying power wiring

12.5

16

32.5

Use round pressure terminals for connections to the power terminal block.

Wiring Connection

ENGLISH

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.

• 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.

Installation Manual 11

Wiring Connection

* Make sure the rubber bushes are

properly used in knock-out holes after
connecting main power.

Connecting cable terminal

Power cord terminal

Cord clamp

Cord clamp

Connecting the cable to Outdoor Unit

• Remove the side panel for wiring connection.

• Use the cord clamp to fix the cord.

• Earthing work

- Connect the cable of diameter more to the earthing terminal provided in the control
box and do earthing.

!

CAUTION

• The circuit diagram is not subject to change without notice.

• Be sure to connect wires according to the wiring diagram.

• Connect the wires firmly, so that not to be pulled out easily.

• Connect the wires according to color codes by referring the wiring diagram.

!

CAUTION

•

The Power cord connected to the unit should be selected according to the following
specifications.

12 Air Conditioner

Connecting Pipes

Preparation of Piping

Main cause of gas leakage is defect in flaring
work. Carry out correct flaring work in the
following procedure.

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 1.5 m longer than the pipe
length.

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.

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)

Flaring work

•

Carry out flaring work using dedicated
flaring tool for R-410A as shown below.

Pipe diameter

Inch (mm)
Ø 1/4 (Ø 6.35)
Ø 3/8 (Ø 9.52)
Ø 1/2 (Ø 12.7)

Ø 5/8 (Ø 15.88)
Ø 3/4 (Ø 19.05)

0.04~0.05 (1.1~1.3)

0.06~0.07 (1.5~1.7)

0.06~0.07 (1.6~1.8)

0.06~0.07 (1.6~1.8)

0.07~0.08 (1.9~2.1)

Firmly hold copper tube in a bar(or die) as
indicated dimension in the table above.

A inch (mm)

Wing nut type Clutch type

0~0.02

(0~0.5)

Copper

tube

Point down

Copper tube

<Wing nut type> <Clutch type>

Smooth all round

Inside is shining without scratches

Slanted Uneven Rough

90°

Pipe

Flare nut

Bar

Copper pipe

= Improper flaring =

Connecting Pipes

ENGLISH

Reamer

"A"

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.

Even length

all round

Inclined

Surface

Cracked Uneven

damaged

Installation Manual 13

thickness

Continuous

Torque
wrench

Connecting Pipes

Forward

Sideways

Backward

Downward

<Figure 1>

Connecting the pipes to the Outdoor unit

• Align the center of the piping and sufficiently
tighten the flare nut by hand.

• 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.

Outside diameter Torque

mm inch N.m
Ø 6.35 1/4 16±2
Ø 9.52 3/8 38±4
Ø 12.7 1/2 55±6

Ø 15.88 5/8 75±7

h When tighten the pipe, hold the haxagonal

body.

14 Air Conditioner

Connecting Pipes

Knock-out Base pan

Gas side piping

Liquid side piping

Drain hose

Connecting wire

Connection pipe

<Figure 3>

Putty or insulating material
(produced locally)

<Figure 2>

• When connecting in a downward direction, knock
out the knock-out 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.

!

CAUTION

Insects or small animals entering the outdoor
unit may cause a short circuit in the electrical
box.

ENGLISH

Installation Manual 15

Connecting Pipes

Trap

Plastic
band

Seal a small
opening around
the pipings with
gum type sealer.

TrapTrapTrap

Seal a small opening Seal a small opening
around the pipings around the pipings
with gum type sealer.with gum type sealer.

Seal a small opening
around the pipings
with gum type sealant.

• Trap is required to prevent water from entering
into electrical parts.

Taping

Drain hose

Pipings

Connecting
cable

Power supply
cord

PlasticPlastic
bandband

Plastic
band

Seal a small Seal a small
opening around opening around
the pipings with the pipings with
gum type sealer.gum type sealer.

Seal a small
opening around
the pipings with
gum type sealant.

Forming the piping

Form 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.

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 tapped 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. Fix the piping onto the wall by saddle or

equivalent.

16 Air Conditioner

Leakage test and Evacuation

Charge hose

Indoor unit

Outdoor unit

Manifold valve

Lo Hi

Pressure
gauge

Nitrogen gas
cylinder(in vertical
standing position)

ENGLISH

Leakage test 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 leak tight, 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 side 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 leakage
test. If it is not available, use a stop valve
for this purpose. The "Hi" knob of the
manifold valve must always be kept close.

• Pressurize the system to no more than 3.0

MPa with dry nitrogen gas and close the
cylinder valve when the gauge reading
reached 3.0 MPa 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.

1. Do a leakage test of all joints of the

tubing(both Indoor unit and outdoor unit) and
both gas and liquid side service valves.
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.

Installation Manual 17

Leakage test and Evacuation

Indoor unit

Outdoor unit

Lo Hi

Manifold valve

Vacuum pump

Open

Open

Pressure
gauge

Gas pipe

Evacuation

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 and Hi" 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.

Required time for evacuation when 30 gal/h

If tubing length is less

than 10 m(33 ft)

30 minutes or more 60 minutes or more

2. When the desired vacuum is reached, close the "Lo
and Hi" 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 counter­clockwise 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 to test run.

vacuum pump is used

If tubing length is longer

than 10 m(33 ft)

0.07 kPa or less

18 Air Conditioner

Test running

Test running

1. PRECAUTIONS IN TEST RUNNING

• The initial power supply must provide at least 90 % of the rated voltage.
Otherwise, the air conditioner should not be operated.

!

CAUTION

① For test run, carry out the cooling operation firstly even during heating season. If

heating operation is carried out firstly, it leads to the trouble of compressor. Then
attention must be paid.

② Carry out the test run more than 5 minutes without fail.

(Test run will be cancelled 18 minutes later automatically)

• The test run is started by pressing the room temperature checking button and down timer
button for 3 seconds at the same time.

• To cancel the test run, press any button.

CHECK THE FOLLOWING ITEMS WHEN INSTALLATION IS COMPLETE

• After completing work, be sure to measure and record trial run properties, and store measured
data, etc.

• Measuring items are room temperature, outside temperature, suction temperature, blow out
temperature, wind velocity, wind volume, voltage, current, presence of abnormal vibration and
noise, operating pressure, piping temperature, compressive pressure.

• As to the structure and appearance, check following items.

□Is the circulation of air adequate?
□Is the draining smooth?
□Is the heat insulation complete

(refrigerant and drain piping)?

□Is there any leakage of refrigerant?

□Is the remote controller switch operated?
□Is there any faulty wiring?
□Are not terminal screws loosened?

M4......118 N.cm{12 kgf.cm} M5......196 N.cm{20 kgf.cm}

M6......245 N.cm{25 kgf.cm} M8......588 N.cm{60 kgf.cm}

ENGLISH

2. Connection of power supply

1. Connect the power supply cord to the independent power supply.

• Circuit breaker is required.

2. Operate the unit for fifteen minutes or more.

3. Evaluation of the performance

1. Measure the temperature of the
intake and discharge air.

2. Ensure the difference between the
intake temperature and the discharge
one is more than 8 °C (Cooling) or
reversely (Heating).

Thermometer

Installation Manual 19

Test running

!

CAUTION

After the confirmation of the above conditions, prepare the wiring as follows:

1) Never fail to have an individual power specialized for the air conditioner. As for
the method of wiring, be guided by the circuit diagram pasted on the inside of
control box cover.

2) Provide a circuit breaker switch between power source and the unit.

3) The screw which fasten the wiring in the casing of electrical fittings are liable
to come loose from vibrations to which the unit is subjected during the course
of transportation. Check them and make sure that they are all tightly fastened.
(If they are loose, it could give rise to burn-out of the wires.)

4) Specification of power source

5) Confirm that electrical capacity is sufficient.

6) Be sure that the starting voltage is maintained at more than 90 percent of the
rated voltage marked on the name plate.

7) Confirm that the cable thickness is as specified in the power sources
specification.
(Particularly note the relation between cable length and thickness.)

8) Never fail to equip a leakage breaker where it is wet or moist.

9) The following troubles would be caused by voltage drop-down.

• Vibration of a magnetic switch, damage on the contact point there of fuse breaking,
disturbance to the normal function of a overload protection device.

• Proper starting power is not given to the compressor.

10) Use only 1 remote-controller contained in indoor unit, when using
simultaneous operation system as shown below.
After setting the ESP value in the Ceiling Concealed Duct Type Indoor Unit,
the main power turns off and then remove the remote controller.

11) It is possible to connect (install) same type of indoor units only and also with
in a single room.

Connecting
cable

HAND OVER

Teach the customer the operation and maintenance procedures, using the operation manual
(air filter cleaning, temperature control, etc.).

20 Air Conditioner

6

Function

Forced Cooling Operation

• Adding the refrigerant in winter.

Setting Procedure

1) Set the DIP Switch as follow after shutting the power source down.

Function

ENGLISH

UU18W
UU24W
UU30W

2) Reset the power.

3) Red LED and Green LED of PCB lights during work.
(The indoor unit is operated by force.)

4) If operation is done, Red LED will be turned off.
If operation is not done normally, Red LED will blink.

5) Close the Liquid valve only after green LED turned off (7 minutes from the start of the machine).
Then close the gas valve after Green LED on.

!

WARNING

• 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.

• Improper Pump down will lead to product turn off along with LED (green &red) off with in
20 minutes from the initial start.

UU36W
UU42W
UU48W
UU60W

Pump Down DIP S/W Setting

Power on

(Red LED On, Green LED Off)

Comp on

(Red LED On, Green LED On)

UU37W
UU43W
UU49W
UU61W

Pump Down Start

(Red LED On, Green LED Off)

Pump Down Complete

(Red LED Off, Green LED On)

Power off

(Red LED Off, Green LED On)

Liquid Valve Closed

Gas Valve Closed

Installation Manual 21

Self-diagnosis Function

1 Time 1 Time 1 Time

2 Times2 Times2 Times

1 Seconds

2 seconds 2 seconds

1 Seconds 1 Seconds

LED01G

(RED)

LED02G

(GREEN)

Self-diagnosis Function

Error Indicator (Outdoor)

Outdoor Error
Ex) Error 21 (DC Peack)

UU18W/24W/30W UU37W/43W/49W/61WUU36W/42W/48W/60W

Error Code

Description

21 DC Peak(IPM Fault)

22 Max. CT(CT2)

23 DC Link Low Volt.

24 Pressure switch/Heater Sink.

26 DC Comp Position Error

27 PFC Fault Error

29 Comp Over Current

32 D-Pipe High(Inv.)

40 CT Sensor(Open/Short)

41 Inv. D-Pipe Th Error(Open/Short)

43 High Pressure Sensor(Open/Short)

44 Outdoor air Th Error(Open/Short)

45 Cond. Middle Pipe Th Error(Open/Short)

46 Suction Pipe Th Error(Open/Short)

48 Cond. Out-Pipe Th Error(Open/Short)

51 Capacity over

53 Communication Error(Indoor ÷ Outdoor)

60 EEPROM Error(Outdoor)

61 Cond. Middle Pipe High

62 Heatsink Error(High)

65 Heatsink Th Error(Open/Short)

67 BLDC motor fan lock(Outdoor)

If abnormal voltage is supplied, the protection circuits will turn off the product in order to prevent
the component damage. The product will automatically restart after 3 minutes.

LED 1

(Red)

2 times ◑ 1 time ◑ OFF

2 times ◑ 2 times ◑ OFF

2 times ◑ 3 times ◑ OFF

2 times ◑ 4 times ◑ OFF

2 times ◑ 6 times ◑ OFF

2 times ◑ 7 times ◑ OFF

2 times ◑ 9 times ◑ OFF

3 times ◑ 2 times ◑ OFF

4 times ◑ 0 OFF

4 times ◑ 1 time ◑ OFF

4 times ◑ 3 times ◑ OFF

4 times ◑ 4 times ◑ OFF

4 times ◑ 5 times ◑ OFF

4 times ◑ 6 times ◑ OFF

4 times ◑ 8 time ◑ OFF

5 times ◑ 1 times ◑ OFF

5 times ◑ 3 times ◑ OFF

6 times ◑ 0 OFF

6 times ◑ 1 times ◑ OFF

6 times ◑ 2 times ◑ OFF

6 times ◑ 5 times ◑ OFF

6 times ◑ 7 times ◑ OFF

LED 2

(Green)

Indoor

status

22 Air Conditioner

Installation Guide at the Seaside

Sea wind Sea wind

Installation Guide at the Seaside

!

CAUTION

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. Otherwise it
needs additional anticorrosion treatment on the heat exchanger.

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.

ENGLISH

Windbreak

Sea wind

3) Select a well-drained place.

• Periodic ( more than once/year ) cleaning of the dust or salt particles stuck on the heat exchanger by using water

• 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.

Installation Manual 23

24 Air Conditioner