LG CV-H186BLB0, CV-H246BLB0 Service Manual

Room Air Conditioner

(Con vertible T ype)

SERVICE MANUAL

MODEL: CV-H186BLB0

CV-H246BLB0
(Applied to new Refrigerant R-407C)

Contents

Functions.................................................................................................................................3

Product Specifications (Cooling & Heating).........................................................................5

Dimensions..............................................................................................................................6

Refrigeration Cycle Diagram..................................................................................................8

Wiring Diagram........................................................................................................................9

Operation Details ..................................................................................................................10

Display Function ...................................................................................................................18

Self-diagnosis Function........................................................................................................18

Installation .............................................................................................................................19

Operation ...............................................................................................................................36

Disassembly of the parts (Indoor Unit)...............................................................................38

Cycle.......................................................................................................................................42

Cycle Troubleshooting Guide...............................................................................................45

Electronic Parts Troubleshooting Guide.............................................................................46

Electronic control device......................................................................................................50

Schematic Diagram...............................................................................................................51

Exploded View and Replacement Parts List.......................................................................52

–2–

Functions

• Room temperature sensor. (Thermistor)

• Maintains the room temperature in accordance with the Setting Temp.

• Indoor fan is delayed for 5 seconds at the starting.

• Restarting is inhibited for approx. 3 minutes.

• High, Med, Low, Chaos

--- Lights up in operation

--- Lights up in Sleep Mode

--- Lights up in Timer Mode

--- Lights up in Deice Mode or Hot Start Mode (only Heating Model)

--- Lights up during compressor running
(only Cooling Model)

• Intermittent operation of fan at low speed.

• The fan is switched to low(Cooling), med(Heating) speed.

• The unit will be stopped after 1, 2, 3, 4, 5, 6, 7 hours.

• The fan is switched to intermittent or irregular operation

• The fan speed is automatically switched from high to low
speed.

• The louver can be set at the desired position or swing
up and down, right and left (not on all models) automatically.

• The setting temperature, indoor fan speed and desired
operation made are automatically set by fuzzy rule.

Indoor Unit

Operation ON/OFF by Remote controller

Sensing the Room Temperature

Room temperature control

Starting Current Control

Time Delay Safety Control

Indoor Fan Speed Control

Operation indication Lamps (LED)

Soft Dry Operation Mode

• Both the indoor and outdoor fan
stops during deicing.

• Hot start after deice ends.

• The indoor fan stops until the
evaporator piping temperature
will be reached at 28°C.

Deice (defrost) control (Heating)

Hot-start Control (Heating)

Sleep Mode Auto Control

Natural Air Control by CHAOS Logic

Airflow Direction Control

Auto Operation

–3–

–4–

Soft Dry Operation Mode.( )

Remote Controller

Operation ON/OFF

Reset

Operation Mode Selection

Fan Speed Selection

Room Temperature Display

Temperature Setting

Setting the Time or Timer

Timer Selection

Timer Setting

Timer Cancel

Sleep Operation

Airflow Direction Control

(Cooling

model only)

(Heating

model only)

TEMPERATURE

LOW HIGH

(Low) (Med) (High) (CHAOS)

Cooling Operation Mode.( )

Heating Operation Mode.( )

Auto Operation Mode.( )

Fan Operation Mode

ON OFF

SET

CANCEL

: High:39°C °Í LOW:11°C

: OFF, ON, OFF °Í ON

: Cancel Sleep Mode, Timer ON or Timer OFF.

: 1, 2, 3, 4, 5, 6, 7hr, Off Timer

: Fan Operates without cooling.

Cooling Heating

Down to 18°C
Up to 30°C

Down to 16°C
Up to 30°C

Product Specifications

–5–

Model Name

Item Unit

Cooling Capacity Btu/h(kcal/h)
Heating Capacity Btu/h(kcal/h)
Moisture Removal /h
Power Source

ø

, V, Hz
Indoor
Outdoor

Input Cooling

Heating

Running Current Cooling

Heating

E.E.R.(Cooling) Btu/h-W
C.O.P.(Heating) w/w

Indoor
Outdoor
Indoor
Outdoor

Refrigerant (R-410A) g
Airflow Direction Control (Up & Down)
Remocon Type

Liquid

Gas

Sleeping Operation
Drain Hose
Connecting Wire
Main Power Cable
Time Delay Safety Function
Air Circulation
Soft Dry
Fan Speed (Indoor)
Timer
Self-Diagnosis
Auto-Restart

Air Circulation m3/min

W

A

Dimensions
(W x H x D)

Net. Weight

mm

kg

Service Valve &
Connecting Tube

CV-H186BLB0 CV-H246BLB0

19,000(4,788) 23,300(6,048)
19,000(4,788) 23,300(6,048)

2.5 3.5
3ø, 220-240V~, 50Hz

13.5 15
45 50

2,050 2,600
2,000 2,550

9.0 11.8

8.8 11.6

9.27 8.96

2.78 2.76

1,200 x 205 615

870 x 655 320

30
59

1,500 1,650

O

L.C.D Wiress

1/4"(6.35)

1/2"(12.7) 5/8"(15.88)

O
O

0.75mm

2

2.0mm

2

2.5mm

2

O
O
O

3 (Hi, Med, Low)

24Hrs

O
O

Dimensions

(1) Indoor Unit

250mm

36mm

36mm

1076mm

1200mm

205mm

615mm

392mm

265mm

468mm

R

63mm

38mm

175mm

(Installation Plate)

(Rear Side)

–6–

(2) Outdoor Unit

Gas side
3-way valve

Liquid side
3-way valve

W

L6L7 L8 L9

L4

L11

L10

D

L1

L2

L5

L3

MODEL

DIM

W mm 870

H mm 655

D mm 320
L1 mm 370
L2 mm 25
L3 mm 340
L4 mm 630
L5 mm 25
L6 mm 546
L7 mm 162
L8 mm 162
L9 mm 54

L10 mm 74.5
L11 mm 79

–7–

CV-H186BLB0
CV-H246BLB0

–8–

Refrigeration Cycle Diagram

• CV-H186BLB0

• CV-H246BLB0

For installation over rated distance, 30g of refrigerant should be added for each meter.
ex) If 18K or 24K Model is installed at a distance of 15m, 300g of refrigerant should be added.

(15-7.5) x 30g = 225g

INDOOR UNIT OUTDOOR UNIT

HEAT
EXCHANGER

HEAT
EXCHANGER

COMPRESSOR

GAS SIDE

LIQUID SIDE

CAPILLARY TUBE

COOLING
HEATING

REVERSING
VALVE

Pipe size(Diameter:ø) Piping length(m) Elevation(m)

MODEL

Gas Liquid Rated Max Rated Max

CV-H186BLB0 1/2" 1/4" 7.5 15 5 8
CV-H246BLB0 5/8" 1/4" 7.5 20 5 8

–9–

Wiring Diagram

(1) Indoor Unit

CV-H186BLB0, CV-H246BLB0

3854A20125GWIRING DIAGRAM

CAPACITOR

MOTOR

BR

OR
RD
BL
BK

CN - FAN

TRANS ­FORMER

THERMISTOR

CN-TH

STEP

MOTOR

STEP

MOTOR

CN-DISP

DISPLAY PCB

ASSY

MAIN PCB

ASSY

CN-UP/DOWN 1,2

CN - TRANS

RY-L
RY-M
RY-H

FUSE

T3.15A

RY-COMP

CN-4WAY

RY-4WAY

RY-FAN

POWER

INPUT

TO OUTDOOR UNIT

TERMINAL

BLOCK

YL

GN/YL

GN/YL

GN/YL

1(L) 2(N) 3 4 5 6 7 8

BR

BL

BLBKWH

RD

DOOR S/W 1,2

OUTDOOR WIRING DIAGRAM

COMP

R

S

BL

WH

BL

BRBKBK

GN/YL

CAPACITOR

CAPACITOR

REVERSING

VALVE

RD
BR

RD
BK

OR

TB1

YL
OR OR
BK

BK

BK

BK BL

WH

C

FAN

MOTOR

TO INDOOR UNIT

TERMINAL

BLOCK

3854A20128P

34

5

6

7

PIPE TH

TNS

NO

L1

L2

L3 L4

D.P

NC NO NC

pipe TH

TB2

1
2
3
4

5
6
7
8
9

Low Ambient PCB

FUSE T3.15A

TRIAC

(2) Outdoor Unit

CV-H186BLB0, CV-H246BLB0

Operation Details

(1) The function of main control

1. Time Delay Safety Control

• 3min…The compressor is ceased for 3minutes to balance the pressure in the refrigeration cycle.
(Protection of compressor)

• 5sec…Vertical air flow direction control louvers open in 5 seconds to prevent noise between louvers and wind.

• 30sec… The 4-way valve is ceased for 30sec. to prevent the refrigerant-gas abnormal noise when the Heating

operation is OFF or switched to the other operation mode while compress is off.
While compressor is running, it takes 3~5 seconds to switch.

2. Airflow Direction Control

• This function is to swing the louver up and down automatically and to set it at the desired position.

• The procedure is as the following.

1st ; Press the ON/OFF Button to operate the product.
2nd ; Press the Airflow Direction Control Button to swing the louver up and down automatically.
3nd ; Repress the Airflow Direction Control Button to set the louver as the desired position.

MODE0

1

2

3

4

5

6

7

135°

Cooling

MODE

MODE

MODE

MODE

MODE

MODE

MODE

9

MODE

(CLOSE)

OPEN

135°

12°

Cooling

HeatingHeatingHeating

MODE 1

MODE 2

MODE 3

MODE 4

MODE 5

MODE 6

MODE 7

MODE 8

MODE 9

CLOSE

OPEN

135°

12°

Cooling

Heating

Heating

Heating

MODE 1

MODE 2

MODE 3

MODE 4

MODE 5

MODE 6

MODE 7

MODE 8

MODE 9

CLOSE

–10–

For Heating Model

• Airflow direction control figure when installed on
the floor.

• Airflow direction control figure when installed
under the ceiling.

3. Cooling Mode Operation

• When selecting the Cooling( ) Mode Operation, the unit will operate according to the setting by the remote
controller and the operation diagram is as following

4. Cooling or Heating Mode with Sleep Mode Auto Operation

• When selecting the Cooling( ) or the Heating( ) combined with the Sleep Mode Auto Operation( ), the

operation diagram is as following.

■ Cooling Mode with the Sleep Mode

• The setting temperature will be raised by 1°C 30minutes later and by 2°C 1 hour later.

• The operation will be stopped after 1, 2, 3, 4, 5, 6, 7 hours.

■ Heating Mode with the Sleep Mode. (Heating model only)

• The operation will be stopped after 1, 2, 3, 4, 5, 6, 7 hours.

Intake Air temp.

COMP. ON
(SET TEMP.+0.5°C)

COMP. OFF
(SET TEMP. -0.5°C)

More than More than

3 minutes 3 minutes

INDOOR FAN Low Low Low Low Low
COMPRESSOR ON OFF ON OFF ON

30 minutes 30 minutes

1°C

1°C

–11–

Setting Temp. +3°C
(Compressor OFF)

Setting Temp.
(Compressor ON)

Indoor Fan Med. Med. Med. Med. Med. Med.
Compressor ON OFF ON OFF ON OFF

Intake Air temp.

COMP. ON
(SET TEMP.+0.5°C)

COMP. OFF
(SET TEMP. -0.5°C)

More than More than
3 minutes 3 minutes

Selecting Selecting Selecting
fan speed fan speed fan speed

COMPRESSOR ON OFF ON OFF ON

INDOOR FAN Low Low

5. Auto Operation

• The operation procedure is as following. (Cooling & Heating Model)

• If initial mode is decided, that mode is continued without the room temperature changing.

• For cooling operation mode over 24°C setting temperature and fan speed are same as cooling only model.

■ Auto Operation for Cooling.

–12–

Press Start/Stop Button

Select Auto Operation Mode

Check the Room temperature

Operation mode
Indoor fan speed are automatically decided by Fuzzy rule.
Setting temperature

Intake-air

temperature

Operation Mode Heating Soft Dry Cooling

Operation Condition Intake-air Temperature Setting temperature Fan speed Air Direction Control

Over 26°C25°C
Over 24°C~below 26°C Intake air -1°C
Over 22°C~below 24°C Intake air -0.5°C
Over 20°C~below 22°C intake air temperture

below 20°C20°C

Over 20°C~below 30°C Fuzzy control

below 20°C20°C

over 30°C30°C

below 21°C

below

24°C

~

Over 24°C

Over

21°C

When Auto Operation
initial start

When pressing room temp­erature setting button
during Auto Operation

Controlled

by Fuzzy logic

In this mode, when
pressing the verti­cal air diretion con­trol.
Button, louvers
moves to 1/f
rhythm (refer to
page 17)

Intake-Air temp

Setting Temp. +0.5°C
(Compressor OFF)

Setting Temp.-0.5°C
(Compressor ON)

Indoor Fan
Compressor

ON ONOFF OFF

Fuzzy Speed

■ Auto Operation for Soft Dry

The Setting temperature will be same as that of the current intake-air temperature.

- Compressor ON temperature; Setting temperature +1°C

- Compressor OFF temperature; Setting temperature -0.5°C

■ Auto Operation for Heating. (Heating model only)

- Compressor ON temperature; Setting temperature

- Compressor OFF temperature; Setting temperature +3°C

• 1/f rhythm louver operation : In Auto operation mode, when pressing the vertical air direction control button,
louver moves as following cycle.

–13–

Intake Air temp. below 20°C over 20°…~below 21°C

Setting temp. 20°C Intake air temp. +0.5°C

21.5°C

20°C

20°C

Intake-Air temp.

Setting temp.

20.5°C

21°C

MODE0

MODE1

MODE2

MODE3

MODE4

MODE5

MODE6

MODE9

(CLOSED)

End

Start

6. Natural wind by CHAOS logic

–14–

For more fresh feeling than other fan speed mode, press
the indoor fan Speed Selector and set to CHAOS mode.
In this mode, the wind blows like natural breeze by auto­matically changing fan speed according to the CHAOS
logic.

Intake Air temp.

OUTDOOR FAN/COMP.

INDOOR FAN

: Setting fan speed : LOW

Cooling on temp.

(Setting temp.+0.5)

Setting CHAOS Natural wind

Setting temp.

Cooling off temp.

(Setting temp.-0.5)

: CHAOS Natural wind

: COMP ON : COMP OFF

GRAPH of Natural wind by the CHAOS logis (During Cooling operation)

Intake Air temp.

30sec

OUTDOOR FAN/COMP.

INDOOR FAN

: Setting fan speed : LOW

Heating off temp.

(Setting temp.+3.0)

Setting CHAOS Natural wind

Heating on temp.

(Setting temp.)

: CHAOS Natural wind

: COMP ON : COMP OFF

GRAPH of Natural wind by the CHAOS logis (During Heating operation)

LOW OR STOP

–15–

7. Heating Mode Operation

The unit will operate according to the setting by the remote controller and the operation diagram is shown as
following.

• For Heating Model

INDOOR FAN

4-WAY VALVE

ON

ON
ON

OFF
OFF

OFF
OFF

ON
ON

ON
ON

26°C

28°C

Indoor piping temp.

Intake Air temp.

Setting temp. +3.0˚C

(Compressor OFF)

Setting temp.

(Compressor ON)

minimum

1min.

minimum

3min.

Fan

Stops

Low

Fan

Low Fan Low Fan Fan StopSelected Fan

Selected

Fan

Low
Fan

Selected

Fan

minimum

3min.

minimum

30sec.

minimum

1min.

OUTDOOR FAN

COMPRESSOR

8. Hot-Start Control

• The indoor fan stops until the evaporator piping temperature will be reached to 28°….

• During heating operation, if piping temperatures falls below 26°C fan stops.

• The operation diagram is as following.

PIPING
TEMPERATURE

1min

COMPRESSOR

INDOOR FAN

ON

26°C

: Selected Fan : Low Fan : Fan Stop

28°C

–16–

9. Deice Control

• Deicing operation is controlled by timer and sensing the outdoor piping temperature.

• The first deicing star ts only when the outdoor pipe temperature falls below -6°C after 30 minutes passed from

starting of heating operation.

• Deicing ends after 5 minutes passed from starting of deice operation or when the outdoor pipe temperature rises
over 12°C even if before 6 minutes.

• The second deicing starts only when the outdoor pipe temperture falls below -6°C after 30 minutes passed from
ending of the first deicing.

More than 30 minutes

of heating operation

Within

6 minutes

DeicingDeicing

ON OFF
ON ON

ON

ON OFF OFF

COMPRESSOR

4-WAY VALVE

INDOOR FAN

-6°C

DEICE ON

12°C

DEICE OFF

The outdoor

piping Temp.

ON

More than 30 minutes

of heating operation

HOT-

START

ON

OFF

ON

INDOOR FAN Low Fan Low Fan

Intake Air temp.

Setting temp. +1.0˚C

(Compressor ON)

Setting temp. -0.5˚C

(Compressor OFF)

Setting temp.

2min.58sec. 2min.58sec.

10min. 10min.7min.

Within 7min.

CoolingCooling

OUTDOOR FAN

COMPRESSOR

Selected

Fan

Selected

Fan

ON

ON

ON

ON

OFF

OFF

OFF

OFFONON

OFF

OFF

ONONOFF

OFFONON

OFF

OFF

10. Soft Dry Operation

• During Soft Dry Operation, the compressor ON temperature is the setting temperature plus 1°C, the compressor
OFF temperature is the setting temperature minus 0.5°C.

• When the room temperature rises over the compressor ON temperature, the operation mode is switched to the
cooling mode.

• When the room temperature falls between the compressor ON temperature and OFF temper ature, the operation
mode is switched to the Soft Dry Operation.
In this temperature range, 10min. Dry Operation, 7min operation OFF. During 10min Dry operation, if the room
temperature falls below compressor OFF temperature, Compressor OFF.

• In micom dehumidify mode, control of fan speed is as following.

12. Protection of the evaporator pipe from frosting

If the temperature of the indoor coil is below -2°C after 7 minutes from starting the compressor, the

compressor and the outdoor fan is stopped, and then after 3 minute delay of the compressor and
the temperature of the indoor coil is over 7°C, the compressor and the outdoor fan is reoperated.
Indoor fan operates at low speed (comp. OFF) or at selected speed (comp. ON)

13. Inlet grille open

Once the inlet grille is opened during operation of the unit, the unit automatically stops operation and the
lamps will be turned-off. But memorized functions are still available.
When the inlet grille is closed again, the unit become waiting state for operation. From then, the unit can be
operated by forced operation button or Start/Stop button of remote controller.

14. Test Operation

• When pressing forced operation switch about 3 seconds, the unit operates in cooling mode at high speed fan
regardless of room temperature and resets in 18 min.

• During test operation, if remote controller signal is received, the unit operates as remote controller sets.

15. Auto Restarting Operation

• When the power is restored after a sudden power failure while in appliance operation, the mode before the
power failure is kept on the memory and the appliance should be on the automatically operates in the mode
on the memory.

• Operation Mode that is kept on the memory

- State of Operation ON/OFF

- Operation Mode/Setting Temp/Selected airflow Speed

- Sleep Timer Mode/Remaining Time of Sleep Timer(unit of hour)

• If no input by the remote controller or no switching of the slide switch within 7 hr after the appliance operates
by the Auto Restarting operation, the appliance is forced to stop at the moment of 7-hr elapse.

–17–

11. Forced operation

• If you lose wireless remote controller, you can operate the unit with forced operation switch.

• The standard conditions are as following.

• Unit operates in low fan mode for first 15 seconds, then switched to proper operation mode according to

intake Air temperature.

Heat pump Model

Room Temp°√ 24

°C

21°C °¥Room Temp°¬24

°C

Room Temp °¥21

°C

Operation Mode Cooling Soft Dry Heating

FAN Speed High Soft Dry Rule High

Setting Temp. 22°C Air Intake Temperature 24°C

R

Forced
Operation Button

Press the Forced Operation Button.

• Press the Forced Operation Button once
again to stop operation.

–18–

Note)

For normal operation after checking by test mode, you should press SW1 nine times for resetting or reconnect
the power cord.

Self-diagnosis Function

1. Protection of the evaporator pipe from frosting

If the temperature of the indoor pipe is below -2°C after 7 mins from starting the compressor, the compressor
and the outdoor fan is stopped, and then after 3 mins delay of the compressor and the temperature of the
indoor pipe is over 7°C, the compressor and the outdoor fan is reoperated.

2. Thermistor Cut Off or Short

Cut Off/Short : Blinks on and off the operation mode LED. (0.5 sec ON/3 sec OFF)

1. Heating Model

Display Function

• Coolling, Soft Dry, Fan, Heating

• Timer Mode

• Sleep Mode

• Hot-start, Deice

Operation Indicator

Timer Indicator

Sleep Timer Indicator

Deice Indicator

• Coolling, Soft Dry, Fan, Heating

• Timer Mode

• Sleep Mode

• Outdoor Unit Operating

Operation Indicator

Timer Indicator

Sleep Timer Indicator

Outdoor Unit Operation

–19–

1. Selection of the best location

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.

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.

3) Piping length and the elevation

1. Installation of Indoor, Outdoor Unit

More than

20cm

More than eye-level

More than

20cm

R

R

More than

20cm

More than

20cm

(Ceiling installation)

(Floor/Wall installation)

More than 10cm

More than 10cm

More than 70cm

Indoor unit

Outdoor unit

B

A

MODEL

18K BTU

1/2" 1/4" 7.5 15

24K BTU

5/8" 1/4"

7.

520

GAS LIQUID

58 30
58 30

Elevation B(m)

Length A(m)

* Additional

refrigerant

(g/m)

Pipe Size

Rated Rated

Max. Max.

• If 18K or 24K Model is installed at a distance of 15m, 225g of refrigerant

should be added .........................................................(15-7.5) x 30g

Installation

–20–

2. Indoor unit installation

■ Before Installing, prepare Installation Plates

• 'Installation Plates' are attached at the bottom of
indoor unit.
Detach them by removing each 3 screws at both
sides.

• Detach 'Side Plate (R,L)' by removing each 2 screws
on both sides.

• Pull the upper right and left side of 'Inlet Grille' to the
front, and it will stop at slightly tilted position.

• Unhook the 'Inlet hanger' from the 'Hanger screw' on
the both left and right side.

• Detach the 'Inlet Grille' from the Indoor Unit.

1) Installation on the ceiling

• Measure and mark the position for the Suspen­sion bolts and the piping hole.

• Drill the hole for anchor nut on the ceiling.

Before secure the Installation Plates, select the bent
direction of the Installion Plate to the inside or the
outside according to the installation circumstances.

• Drill the piping hole on the wall slightly tilted to the
outdoor side using a ø70 hole-core drill.

R

1076

Suspension

bolt

Center-line for the

piping hole

265

1236

265

Install Plate

1)

2)

R

5~7mm

Indoor Outdoor

WALL

Side Plate

Inlet Grille

Inlet hanger

Hanger

screw

–21–

• Insert the nuts and washer onto the suspension bolts

for locking the suspension bolts on the ceiling.

• Mount the suspension bolts to the anchor-nuts firmly.

• Secure the Installation plates onto the Suspension

bolts (adjust level roughly.) using nuts, washers and
spring washers.

• Engage 2 hooks on the both left and right side
of the unit to the lower slot of Installation Plates.

• Adjust a level with a level gauge on the direction
of left-right, back-forth by adjusting suspension
bolts.

• Move the hooks on the unit to the upper slot of
Installation Plates. Then the unit will be declined
to the bottomside so as to drain well.

Washer

Nut

Suspension

bolts

Ceiling

Anchor nut

Suspension

bolts

Spring
washer

max.

12mm

Washer

Nut

1)

2)

Suspension

bolt

Installation plate

Adjust a level

R

Level gauge

Lower slot

R

R

Upper slot

–22–

Drain hose

Ceiling

Ceiling

Ceiling

Front of view

Side of view

1. Install declination of the indoor unit is very important for the drain of the convertible type air
conditioner.

2. Minimum thickness of the insulation for the connecting pipe shall be 7mm.

3. If the Installation Plates are fixed to horizontal line, the indoor unit after installing will be declined
to the bottomside.

CAUTION

• The unit must be horizontal or declined to the drain hose connected when finished installation.

• The unit must be declined to the bottomside of the unit when finished installation.

–23–

R

R

R

1

2

•

Before working, refer to "Connecting pipe

and cable to Indoor Unit" on page 28, 31.

R

Inlet hanger

Hook

Cabinet Bottom

• Secure the unit to the Installation Plates with four M8
bolts and washers.

• Hook up the Inlet Grille Hook to the cabinet.

• Hang the Inlet Hanger to the screw.

• Fit the projection hooks of the side plates to the 'Side

Panel' and the 'Front Panel' by lifting it.

• Fasten the screws.

–24–

1076

more than

260

265

Washer

Nut

Wall

Anchor nut

Spring
washer

Wall

5~7mm

Less than

12mm

1236

Indoor Outdoor

2) Installation on the Wall

• 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 nut on the wall.

• Drill the piping hole on the wall slightly tilted to the out-
door side using a ø70 hole-core drill.

• Secure the 'Install Plate' onto the wall with four anchor

bolts, washers and spring washers.

Before secure the Install Plates, select the bent direc­tion of the 'Install Plate' to the inside or outside accord­ing to the installation circumstances.

–25–

Install the Indoor unit onto Installation Plate.

• Insert 2 hooks on the both left and right side of the unit
to the inner slot (wall side) of the Installation Plate.

• Secure the unit to the Installation Plate with four M8
bolts and washers.

• Hook up the Inlet Grille Hook to the cabinet.

• Hang the Inlet Hanger to the screw.

• Fit the projection hooks of the side plates to the 'Side

Panel' and the 'Front Panel' by lifting it.

• Fasten the screws.

R

2

1

•

Before working, refer to "Connecting pipe
and cable to Indoor Unit" on page 29, 31.

Inner slot

–26–

3) Installation on the floor

Installation of Mount Bracket.

• Select and mark the position for Mount Brackets and
the piping hole.

• Drill the hole for the anchor nut on the wall.

• Drill the piping hole using a ø70 hole-core drill.

• Secure the Mount Brackets on the wall with four M4

screws.

Install the indoor unit onto the Mount Brackets.

• Engage the slot at the back of the unit with Mount
Bracket.

• Drill the piping hole with 70mm dia, hole core drill.

• Piping hole should be slightly slant to the outdoor side.

After Installing, reassemble detached parts.

• Hang the 'Inlet Grille' and hook the 'Inlet Hanger' to the
Hanger Screw.

• Assemble the 'Side Plates(R,L)' with 2 screws on both
left and right side.

Floor mount

bracket

Slot

Floor mount
bracket

Install plate

Slot

Piping hole

Wall

5~7mm

Indoor Outdoor

more than 760mm

From the left wall

From the
right wall

448mm

more than 840mm

Wall

–27–

2. Piping and Drainage of Indoor Unit

2-1. Preparation of Piping

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 length of the
pipe.

2. Remove burrs.

• Remove burrs from cut edges of pipes.

• Turn the pipe end toward down to avoid the metal

powder entering the pipe.

Caution:
If burrs are not removed, they may cause a gas leak­age.

3. Flaring the pipes.

• Insert the flare nuts, mounted on the connection
ports of both indoor and outdoor unit, onto the
copper pipes. (When the flare nuts are removed
from the indoor unit.) Some gas may leak, as
some gas is charged to prevent the inside of the
pipe from rusting.

• Fit the copper pipe end into the Bar of flare tool
about 0~1.0mm higher.

(See illustration)

• Flare the pipe ends.

• Carr y out flaring work using dedicated flaring tool

for R-410A.

4. Tape the flaring portion to protect it from the
dust or damages.

90

Slanted Rough

Pipe cutter

Pipe

Reamer

Point down

"A"

Bar

Bar

Clamp handle

Red arrow mark

Cone

Yoke

Handle

Copper pipe

Inclined Cracked Uneven

thickness

Surface

damaged

= Improper flaring =

When properly flared, the internal surface of the flare will
evenly shine and be of even thickness.
After the flare part comes into contact with the connec­tors, carefully check the flare finish.

"A"; ø15.88 mm (5/8")

1.0 mm

ø12.7 mm (1/2")

0.5 mm

ø9.52 mm (3/8")

0.5 mm

ø6.35 mm (1/4")

0.5 mm

–28–

2-2. Installation on the ceiling

1)

Connecting the pipes to the indoor unit

The pipe can be connected to right side, bottom
or back of the unit.

1. For the Right Side Piping

• After bending an end of the connecting tube, align the
center of the pipings and sufficiently tighten the flare
nut with fingers.

• Finally, tighten the flare nut with torque wrench until
the wrench clicks.

• Connect the Drain Hose insulated to the drain outlet.
Drain hose should be go through under the Hose
Bracket as shown in figure .

• Hang the drain hose on the hose hanger and fix it to
the hole of the hose bracket with a screw.

2. For the Bottom Side Piping

• Remove the knock-out on the bottomside of Inlet Grille

• Align the center of the pipings and sufficiently tighten

the flare nut with fingers.

• Finally, tighten the flare nut with torque wrench until
the wrench clicks.

• Connect the Drain Hose insulated to the drain outlet.

• Hang the drain hose on the hose hanger and fix it to

the hole of cabinet bottom with a screw.

2) Connecting the Drain Hose

• The drain hose can be connected to not only the

right side but also left side of the unit.

• If the drain hose is connected to the left side, it

should go through the cabinet bottom.

• Hang the drain hose on the hose hanger and fix it to
the hole of cabinet bottom with a screw.

R

R

R

Drain Hose

Drain Hose

Piping

Hose

Bracket

1

3

4

5

2

Hose Hanger

Hose Hanger

Hose
Hanger

BOTTOM

–29–

2-3.

Installation on the wall or floor

1) Connecting the pipes to the indoor unit

1. For the Right Rear Piping

• Remove the knock-out at the back side of the cabinet.

• After bending an end of the connecting tube, align the

center of the pipings and sufficiently tighten the flare
nut with fingers.

• Finally, tighten the flare nut with torque wrench until
the wrench clicks.

• Connect the Drain Hose insulated to the drain outlet.

• Tape the Drain Hose to the pipings to avoid coming

off the drain-outlet.

2. For the Right Side Piping

• After bending an end of the connecting tube, align the
center of the pipings and sufficiently tighten the flare
nut with fingers.

• Finally, tighten the flare nut with torque wrench until
the wrench clicks.

• Connect the Drain Hose insulated to the drain outlet.

• Tape the Drain Hose to the pipings to avoid coming

off the drain-outlet.

3.

For the Right Bottom Piping

• Align the center of the pipings and sufficiently tighten
the flare nut with fingers.

• Finally, tighten the flare nut with torque wrench until
the wrench clicks.

• Connect the Drain Hose insulated to the drain outlet.

2)

Connecting the Drain Hose

• The drain hose can be connected to not only right
side but also left side of the unit.

Taping
Drain Hose

Piping

Piping

Drain Hose
Connecting

Cable

Drain Hose

Piping

Drain Hose

REAR

BOTTOM

Taping

Taping

–30–

1) Connecting the pipes 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) Checking the Drainage

1. Remove the Air Filter.

• To remove air filter, take hold of tab and pull

slightly upwards.

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.

3. Connecting Pipes to the Outdoor Unit

4. Checking the Drainage

R

Liquid side piping
(Smaller Dia.)

Gas side piping
(Bigger Dia.)

Torque wrench

Outdoor unit

R

Pipe Size Torque

Liquid Side

1/4" 1.8kg·m
3/8" 4.2kg·m

Gas Side

1/2" 5.5kg·m
5/8" 6.6kg·m

–31–

1) Connecting cables to the Indoor Unit

1) Remove the Air guide - L by loosening 2 screws
after removing the Inlet grille from the Indoor
unit.

2) Connect the wires to the ter minals 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

R

AIR GUIDE-L

INDOOR UNIT

Control

Panel

1

2

Clamp

Terminals on the indoor unit

POWER

INPUT

GN/YL

POWER

INPUT

GN/YL

Terminals on the indoor unit

1(L) 2(N)

34

Terminals on the outdoor unit

34

Terminals on the outdoor unit

34

567

1(L) 2(N)

3456 78

• Cooling & Heating type

• Cooling only type

NORMAL CROSS­SECTIONAL AREA

• 2.5mm2(24K)

• 2.0mm2(18K)

NORMAL CROSS­SECTIONAL AREA

• 2.5mm

2

(24K)

• 2.0mm2(18K)

NORMAL
CROSS­SECTIONAL
AREA

0.75mm

2

The power cord connected to the
indoor unit should be complied with
the following specifications
(Type H05VV-F(Indoor)
approved by HAR or SAA).

The power connecting cable

connected between the indoor and
outdoor unit should be complied
with the following specifications
(Type H07RN-F approved by HAR or SAA).

The connecting cable connected
between the indoor and outdoor unit
should be complied with the
following specifications
(Type H07RN-F approved by HAR or SAA).

CAUTION

Ø8.0mm

Ø10.0mm

Ø8.0mm

Ø10.0mm

Ø6mm

5. Connecting Cables between Indoor Unit and Outdoor Unit

2) Clamping of cables

1) Arrange 2 power cables on the control panel.

2) First, fasten the steel clamp with a screw to the inner boss of control panel.

3) For the cooling model, fix the other side of the clamp with a screw strongly.
For the heat pump model, put the 0.75mm2cable(thinner cable) on the clamp and tighten it with a plastic clamp to the oth­er boss of the control panel.

4) In Australia, the length of power supply cord measured from the entry of the power supply cord to the middle of live pin on
the power plug should be over 1.8m.

–32–

3) Connecting the cable to Outdoor Unit

1. Remove the Cover control from the unit by loosening
a screw.
Connect the wires to the terminals on the control
board individually as following.

2. Secure the cable onto the control board with the hold­er (clamper).

3. Refix the cover control to the original position with the
screw.

4. Use a recongnized circuit breaker 20A(18K, 24K)
between the power source and the unit. A disconnec­tion device to adequately disconnect all supply lines
must be fitted.

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 contr ol 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) The means for disconnection from a power supply shall be incorporated in the fixed wiring and
have an air gap contact separation of at least 3mm in each active(phase) conductors.

Outdoor unit

Terminal block

Connecting
cable

Cover control

Holder for
connecting
cable

Over 5mm

Holder for
power supply
cord

Power supply
cord

–33–

4) Form the pipings

1. Wrap the connecting portion of indoor unit with
the Insulation material and secure it with two
Plastic Bands. (for the right pipings)

• If you want to connect an additional drain hose, the
end of the drain-outlet should keep 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 Pipings, drain hose and Connecting
Cable from bottom to top.

3. Form the pipings gathered by taping along the
exterior wall and fix it onto the wall by saddle or
equivalent.

2. Tape the Pipings and Connecting cable from
bottom to top.

3. Form the pipings gathered by taping along the
exterior wall, and make the trap prevent water
from entering into the room.

4. Fix the pipings onto the wall by saddle or
equivalent.

In case of the Outdoor unit being installed
below position of the Indoor unit.

In case of the Outdoor Unit being installed
above position of the Indoor Unit.

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

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

Taping

Drain hose

Pipings
Connecting

cable

Plastic Band

Power supply
cord

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

Trap

–34–

6. Air Purging of the Pipes and 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

–35–

7. Test running

R

Thermometer

2) Evaluation of the performance

1. Measure the temperature of the intake and dis-

charge air.

2. Ensure the difference between the intake temper-

ature and the discharge one is more than 8°C
(Cooling) or reversely (Heating).

3)

Selection of the slide switch according to
installation method (Heating model only)

1. In case the indoor unit is installed on the floor,

please change the side switch which is on the
Main PCB Assembly to the 'BOTTOM' state.

2. In case the indoor unit is installed under the ceil-

ing, please change the slide switch which is on
the Main PCB Assembly to the ' CEILING' state.

The initial state of the slide switch is set for
the bottom installation.

1) Connection of power supply

1. Connect the power supply cord to the inde-

pendent power supply.

• Circuit breaker is required.

2. Prepare the remote control.

• Insert two batteries provided.
Remove the battery cover from the remote con­troller.

• Slide the cover according to the arrow direction.
Insert the two batteries.

(Two "R03" or "AAA" dry-cell batteries or equiva­lent.)

• Be sure that the (+) and (-) directions are cor­rect.

• Be sure that both batteries are new.
Re-attach the cover.

• Slide it back into position.

3. Operate the unit for fifteen minutes or more.

–36–

Operation

(1) Name and Function-Remote controller

1) Cooling Model

Signal transmitter.

Transmits the signals
to the room air conditioner.

Remote Controller

ON OFF

SET

CANCEL

1

2

7

8

9
10
11

4
5
6

3

OPERATION DISPLAY

Displays the operation conditions.

START/STOP BUTTON

Operation starts when this button is pressed and stops
when the button is pressed again.

OPERATION MODE SELECTION BUTTON

Used to select the operation mode.

ON/OFF TIMER BUTTONS

Used to set the time of starting and stopping operation.

TIME SETTING BUTTONS

Used to adjust the time.

TIMER SET/CANCEL BUTTONS

Used to set the timer when the desired time is obtained
and to cancel the Timer operation.

AIR FLOW DIRECTION START/STOP BUTTON

Used to stop or start louver movement and set the
desired up/down airflow direction.

SLEEP MODE AUTO BUTTON

Used to set Sleep Mode Auto operation.

AIR CIRCULATION BUTTON

Used to circulate the room air without cooling or heat­ing (turns indoor fan on/off).

ROOM TEMPERATURE CHECKING BUTTON

Used to check the room temperature.

RESET BUTTON

Used prior to resetting time or after replacing batteries.

123

4

5

6

7

8

9

10

11

–37–

2) Heat Pump Model

Signal transmitter.

Transmits the signals
to the room air conditioner.

Remote Controller

ON OFF

SET

CANCEL

1

2

7

8
9

10

11

4

5

6

3

OPERATION DISPLAY

Displays the operation conditions.

START/STOP BUTTON

Operation starts when this button is pressed and stops
when the button is pressed again.

OPERATION MODE SELECTION BUTTON

Used to select the operation mode.

ON/OFF TIMER BUTTONS

Used to set the time of starting and stopping operation.

TIME SETTING BUTTONS

Used to adjust the time.

TIMER SET/CANCEL BUTTONS

Used to set the timer when the desired time is obtained
and to cancel the Timer operation.

AIR FLOW DIRECTION START/STOP BUTTON

Used to stop or start louver movement and set the
desired up/down airflow direction.

SLEEP MODE AUTO BUTTON

Used to set Sleep Mode Auto operation.

AIR CIRCULATION BUTTON

Used to circulate the room air without cooling or heat­ing (turns indoor fan on/off).

ROOM TEMPERATURE CHECKING BUTTON

Used to check the room temperature.

RESET BUTTON

Used prior to resetting time or after replacing batteries.

123

4

5

6

7

8

9

10

11

–38–

Disassembly of the parts (Indoor unit)

Warning :

Disconnect the unit from power supply before making
any checks.
Be sure the power switch is set to “OFF”.

1. Remove the air filter.

• Pull the inlet grille slightly toward you.

• Pull out the air filter. (2 pieces)

2. Remove the girlle fr om chassis

• Remove the screws securing the side plate and
push to the bottom-side.

• Unhook the hanger from the hanger screw at the
left and the right side.

• Pick out the inlet grille.

3. Remove the lower air guide

• Remove a screw of both side fixing "barrier air­guide".

• Remove the screws of both sides of the lower air­guide.

• Remove the lower air-guide toward “arrow mark”
by turning upwards as shown in figure.

R

RRR

1

3

4

2

Hanger

Screw

Hanger

Inlet Grille

Barrier Air guide

Lower Air guide

–39–

4. Remove air guide upper, crossflow fan and
motor.

• Remove the screws of both sides and center
securing the upper air-guide.

• Remove 2 screws fastening the bracket of door
switch.

• Remove a bearing assembly by removing a
screw and the bearing cover.

• Remove 4 screws securing the motor cover.

• Loosen the screw securing the crossflow fan to

the fan motor shaft. (do not remove)

• Remove the crossflow fan by sliding it out from
the shaft of fan motor.

5. Remove the control box Assembly.

• Disconnect the step motor connector, fan motor
connector, display PCB connector, thermistor
connector and door switch connector from the
main PCB.

• If necessary, disconnect power supply cord and
connecting cable from the terminal block and
remove the cord clamp screw.

• Remove 2 screws securing the control box and
pick out the control box carefully.

R

R

R

Motor

Cover

Bearing

Cover

Bearing

Door

Switch

–40–

6. Remove the front panel.

• Remove the screws of both sides fixing the front
panel.

• Push the upper side of front panel strongly to pull
out the front panel from the inner hook of diffuser
frame.

• Pull down the front panel carefully not so as to
harm the display PCB wires and thermistor
wires.

7. Remove the diffuser assembly.

• Remove the screws of both side of diffuser
assembly. (4 pieces)

• Push the upper side of cabinet strongly to pull
out the inner hook of diffuser frame from the
cabinet hole.

• Take up the diffuser frame carefully not so as to
harm the display PCB wires and the step motor
wires.

8. Remove display PCB assembly.

• Remove the screws at the both side of display
cover.

• If necessary, disconnect the display PCB
connector from PCB assembly.

• Remove 2 screws of PCB assembly.

R

R

Diffuser frame

Front

Panel

Diffuser

frame

Front

Panel

Hook

Diffuser

frame

Cabinet

Hook

Display Cover

9. Remove the vane-upper, vane-lower and step
motor.

• Remove 2 screws securing the step motor
assembly and pull it out from the vanes carefully.

• Unhook the vanes from the vane supporter and
remove the upper vane and lower vane by pulling
the center of vanes with care.

10. Remove the drain pan assembly.

• Remove the both side of screws. (4 pieces)

• Pull out the drain pan assembly.

• Be careful not to harm to the EPS packing of

drain pan and the tubings of evaporator.

11. Remove the evaporator.

• Remove the screws of both sides securing the
EVA barrier-R/L on the side cabinet.

• Remove the screws which fasten the barrier on
the evaporator and take out the barrier assembly.

• Remove the evaporator assembly by sliding
toward arrow mark. (As shown in figure)

–41–

EVA. Barrier-L

EVA. Barrier-R

Side Cabinet

Lower Vane

Upper Vane

Vane Supporter

Step Motor

–42–

Cycle

1. Installation (Connecting the piping between indoor and outdoor unit)

• Installation

(1) Connect the piping between the indoor and

outdoor unit firmly.

– Incorrect connection may cause the leakage and

incomplete vacuuming.

(2) Attach the charging hose (manifold gage) to the

service port.

– Charging hose is necessary to check the pressure

and to inject N2 for leakage test.

– The valve of charging hose must be closed before

being connected.

(3) Inject the 100~300g N

2 through the charging hose

opening the valve.

(4) Check the joint part using a gas detector or soapy

water for leakage.

– On checking, the service valve of main service port

must be closed, this test is only for checking whether
pipe connection is OK or not.

(5) If there is no leakage, discharge N

2 in piping

completely into tank for retrieving.

– Completely discharge is needed for vacuuming.
– If leakage is found, please fasten the joint more

tightly.

(6) After closing the valve of charging hose,

disconnect the tank and connect the vacuum pump
to charging hose and open the valve again for
vacuuming.

(7) Turn on the vacuum pump until the pressure drops

below 0 kg/cm

2

.

(8) After vacuuming, disconnect the vacuum pump and

open the spindle of service port (liquid-side)
slightly for 30 sec and then open the spindle of
service port (gas side) with hexagonal wrench.

(9) Open the liquid side completely first and then the

gas side fully in order.

Lo

Purge the air

Outdoor unit

Indoor unit

Liquid side

Gas side

2(3)-Way
valve

3-Way
valve

Gas cylinder

R-407C

–43–

2. Disconnection (on moving)

• Disconnection

(1) Attach the charging hose (manifold gage) to

the service port.

– Connect the manifold gage once to the service

port not stopping. Stopping in the middle of
process may cause the leakage.

(2) Purge the air in hose into special device such

as retrieving tank opening the valve of
charging- hose (gas side) slightly and then
close it tightly.

(3) Operate the air conditioner for 10~15 min until

cycle is stabilized.

(4) Close the spindle of service port (liquid side-

high pressure) and wait till pressure of gas
side (low pressure) drops below 0 kgf/cm2.

(5) After the needle of gage indicates below

0 kgf/cm2, close the valve of gas side quickly
and turn off the power.

(6) Disconnect the piping between indoor and

outdoor unit and then put on service cap to
the service port.

Lo

Outdoor unit

Indoor unit

Liquid side

Gas side

Closed

Closed

2(3)-Way
valve

3-Way
valve

Retrieving Tank

–44–

3. Gas Charging

(After Evacuation)

• Procedure

(1) Connect the charge hose to the charging

cylinder.

– Connect the charge hose which you dis-

connected from the vacuum pump to the valve
at the bottom of the cylinder.

– If you are using a gas cylinder, also use a scale

and reverse the cylinder so that the system can
be charged in liquid state.

(2) Purge the air from the charge hose.

– Open the valve at the bottom of the cylinder

and press the check valve on the charge set to
purge the air. (Be careful of the liquid
refrigerant). The procedure is the same if
using a gas cylinder.

(3) Open the valve (Lo side on the charge set and

charge the system with liquid refrigerant.

– If the system can not be charged with the

specified amount of refrigerant, it can be
charged with a little at a time (approximately
150g each time) while operating the air
conditioner in the cooling cycle; however, one
time is not sufficient, wait approximately 1
minute and then repeat the procedure.

(4) Immediately disconnect the charge hose from

the 3-way valve’s service port.

– Stopping partway will allow the gas to be

discharged.

– If the system has been charged with liquid

refrigerant while operating the air conditioner,
turn off the air conditioner before disconnecting
the hose.

(5) Mount the valve stem nuts and the service

port nut.

– Use torque wrench to tighten the service port

nut to a torque of 1.8 kg.m.

– Be sure to check for gas leakage.

\

This is different from previous procedures.
Because you are charging with liquid refrigerant
from the gas side, absolutely do not attempt to
charge with larger amounts of liquid refrigerant
while operating the air conditioner.

Lo

Charging
cylinder

Outdoor unit

Indoor unit

Liquid side

Gas side

CLOSE

Open

2(3)-Way
valve

3-Way
valve

OPEN

Open

Check valve

(1)

Cycle Troubleshooting Guide

Trouble analysis

1. Check temperature difference between intake and discharge air and operating current.

Temp. Difference

Temp. difference : approx. 0°C
Current : less than 80% of

rated current

Temp. difference : approx. 8°C
Current : less than 80% of

rated current

Temp. difference : less than 8°C
Current : over the rated

current

Temp. difference : over 8°C

Operating Current

All amount of refrigerant leaked out
Check refrigeration cycle

Refrigerant leakege
Clog of refrigeration cycle
Defective compressor

Excessive amount of refrigerant

Normal

Notice :

Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relativery higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger.

2. Check temperature and pressure of refrigeration cycle.

NOTICE :

1. The suction pressure is usually 8.5~9.5 kg/cm2G at normal condition.

2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it
with putty.

Suction pressure Temperature

(Compared with (Compared with Cause of Trouble Description

the normal value) the normal value)

Defective compressor Current is low
Defective 4-way reverse valve

Excessive amount of High pressure does not quickly

Normal refrigerant rise at the beginning of

operation

Insufficient amount of Current is low

Lower Higher refrigerant (Leakage)

Clogging Current is low

High

Higher

–45–

Electronic Parts Troubleshooting Guide

: The unit does not operate.

Possible Trouble 1

–46–

YES

YES

YES

NO

YES

Is the input voltage

of transformer AC220V?

Is the input voltage

of IC01D DC14V?

Check the FUSE
and the wiring diagram
Check the RY-COMP PIN 3
and CN-4WAY PIN 1

Is the output voltage

of IC01D DC12V?

Is the PIN 29 of

Micom DC5V?

Exchange Micom

YES

NO

Check the main P.C.B
pattern

NO

NO

Exchange D01D-D05D

NO

YES

Exchange
the transformer

Is shorted the

transformer output?

NO

YES

Is the output voltage

of IC02D DC5V?

NO

Is the PIN 55,64 of

Micom DC5V?

YES

Exchange IC01D

Exchange IC02D

NO

Check the 5V P.C.B
pattern

Is the output voltage

of transformer about AC14V?

Exchange IC01A

–47–

Possible Trouble 2

: The indoor fan does not operate.

NO

NO

YES

NO

Is it DRY mode?

Is it the HOT

mode?

Is IC02M operated

normally?

Check the fan motor
and connector.
(CN-FAN)

YES

Is the each S.S.R

any problem?

YES

NO

YES

Adjust set temperature

Does the temperature

set all right?

NO

Adjust set temperature

Does the temperature

set all right?

NO

YES

YES

Exchange

IC02M

Exchange S.S.R

–48–

Possible Trouble 3

: Up/Down Air direction louver does not operate.

Possible Trouble 4

: Remote controller does not operate.

YES

NO

YES

Is IC01M operated

normally?

Is the PIN 1 of

CN-UP/DOWN DC12V?

Check the step motor
and connector
(CN-UP/DOWN 1,2)

Check the main P.C.B
DC12V pattern

NO

Exchange

IC01M

NO

YES

YES

YES

Is the battery consumed

much?

Is the PIN 8 of CN-DISP

DC5V?

Is the connection of

CN-DISP all right?

Exchange receiver ass'y

Connect CN-DISP exactly

NO

NO

Exchange the battery

Check the main P.C.B
DC5V pattern

–49–

Possible Trouble 5

: Ineffective Heating

Possible Trouble 6

: The unit does not operate by forced operation switch.

YES

YES

NO

Is 4way-valve operated?

Check the RY-4WAY
and 4way-valve

Exchange IC02M

NO

Check RY-4WAY

NO

YES

Is the F/OP key

any problem?

Check P.C.B pattern check

Exchange F/OP key

Is IC02M operated

normally?

–50–

Electronic control device

(1) MAIN P.C.B ASM (CV-H186BLB0, CV-H246BLB0)

(2) DISPLAY P.C.B ASM (P/No.: 6871AQ3263A)

Schematic Diagram

–51–

Exploded View and Replacement Parts List

1. Indoor Unit

–52–

130911

263230

35211A

342800

359010

152302

330870

354211

352115

261704

137213

W0CZZ

166000

346811

268712237900

235450

146811

159911

159911

352150

267110

137213

135314

–53–

130911 CABINET ASSY 3091AP2533A 3091AP2533A
135314 GRILLE ASSY, INLET SUB 5237A10002K 5237A10002K
137213 PANEL ASSY, SIDE 3720AP2767P 3720AP2767P
137213 PWB(PCB) ASSY, MAIN 6871A20042H 6871A20042H
146811 MOTOR ASSY, STEP 4681AR2727G 4681AR2727G
152302 FILTER(MECH), A/C 5230AP7093A 5230AP7093A
159911 VANE ASSY, HORIZONTAL 5991AP2867B 5991AP2867B
159911 VANE ASSY 5991AP7334C 5991AP7334C
166000 SWITCH, PUSH 6600AP2059B 6600AP2059B
235450 DISPLAY ASSY (MECH) 3545AP7224A 3545AP7224A
237900 WINDOW, DISPLAY 3790AP7080A 3790AP7080A
261704 TRANSFORMER, POWER 6171AQ3198E 6171AQ3198E
263230 THERMISTOR ASSY 6323AQ2333Y 6323AQ2333Y
267110 REMOTE CONTROLLER ASSY 6711A20010K 6711A20010K
268712 PWB(PCB) ASSY, DISPLAY 6871AQ3263A 6871AQ3263A
330870 DRAIN PAN ASSY 3087AP7233A 3087AP7233A
342800 BEARING 3H02821B 3H02821B
346811 MOTOR ASSY, INDOOR 4681AP2306G 4681AP2306E
352115 TUBE ASSY, EVA-IN 5211AP2810J 5211AP2810J
35211A TUBE ASSY, SUCTION INDOOR 5211AP2813B 5211AP2813A
352150 HOSE ASSY, DRAIN 5251AP2460B 5251AP2460B
354211 EVAPORATOR ASSY 5421AP2812A 5421AP2812A
359010 FAN ASSY, CROSS FLOW 5901AR2351E 5901AR2351E
W0CZZ CAPACITOR 3H00671A 3H00671A
738280 MANUAL, OWNERS 3828A20147D 3828A20147D
738281 MANUAL, SERVICE 3828A20059X 3828A20059X

Parts List (Heat Pump Models)

LOCATION

DESCRIPTION

PART No.

NO.

REMARK

CV-H186BLB0 CV-H246BLB0

2. Outdoor Unit

–54–

435512

554030

552201

437212

552201

W0CZZ-2

268711

263230

435511

W6640

668713 W0CZZ-3

552202

566000

552203

552203

430410

552570

554160

561410

447910

W0CZZ-1

546810

559010

437210

–55–

Parts List (Heat Pump Models)

LOCATION

DESCRIPTION

PART No.

NO.

REMARK

349480 ORIFICE 4948AP2527A 4948AP2527A
435311 GRILLE, DISCHARGE 3530A20007B 3530A20007B
435512 COVER ASSY, TOP(OUTDOOR) 3H03266K 3H03266K
437210 PANEL ASSY, FRONT 3721A20005Q 3721A20005Q
437212 PANEL ASSY, REAR 3720AP0003D 3720AP0003D
546810 MOTOR ASSY, OUTDOOR 4681A20013T 4681A20013X
552111 TUBE ASSY, CAPILLARY 5211A10039T 5211A30331R

552202 VALVE, REVERSING 3A02027A 3A02027A
552203-1 VALVE, SERVICE 2H01890D 2A00392E
552203-2 VALVE, SERVICE 2H02479F 2H02479F

554031 CONDENSER ASSY, BENT 5403A20022F 5403A20022F

554160 COMPRESSOR SET 2520UWFP2AA 2520UWJP2BA

559010 FAN ASSY, PROPELLER 1A00195B 1A00195B

561410 COIL ASSY, REVERSING VALVE 3A02028Y 3A02028Y

649950 CONTROL BOX ASSY, OUTDOOR 4995A20027M 4995A20027N
W0CZZ-1 CAPACITOR, DRAWING 3A00988B 6120AR2094T
W0CZZ-2 CAPACITOR, DRAWING 2A00986D 2A00986D

CV-H186BLB0 CV-H246BLB0

P/No.: 3828A20059X

June, 2003

Printed in Korea