AirStage ARXB24LATH, ARXB45LATH, ARXB07LALH, ARXB09LALH, ARXB12LALH Service Manual

Small VRF system

for light commercial
and home use

SERVICE MANUAL

CONTENTS

1. TEST RUN

1-3 TEST RUN CONTROL................................................................................................

1-2-1 Check Items Before Power ON............................................................................

1-2-2 Check Items After Power ON...............................................................................

1-2 TEST RUN METHOD..................................................................................................

1-1 EXECUTION PROCEDURE AND EXECUTION PRECAUTIONS.............................

1-2-4 Automatic address setting procedure for indoor units..........................................

01-01
01-03
01-03
01-04

01-07

1-2-3 Automatic address setting procedure for Signal amplifiers.................................. 01-06

01-10

1-4 Field Setting And Monitor Mode List....................................................................... 01-11

2-1 INPUT / OUTPUT LIST..............................................................................................

2. OUTDOOR UNIT OPERATION CONTROL

2-2 COMPRESSOR OPERATION....................................................................................

02-01
02-02

02-02
02-03

2-2-3 Speed Range of Start,Stop,and Operation..........................................................

2-2-2 Capacity Control.................................................................................................

02-02

2-2-1 Operation / Stop Condition.................................................................................

2-5 SPECIAL OPERATION..............................................................................................

02-09
02-09
02-10

2-5-2 Pre-Heat Operation............................................................................................

2-5-1 Oil Recovery Operation......................................................................................

2-6 PROTECTIVE FUNCTION........................................................................................

02-11
02-11

2-6-1 Protective Function List......................................................................................

2-5-3 Defrost Operation Control..................................................................................

02-10

2-3 FAN CONTROL..........................................................................................................

02-05

2-4 EXPANSION VALVE CONTROL...............................................................................

02-08

02-05

02-07

2-3-3 Low noise mode..................................................................................................

02-08

2-3-4 Other Control.......................................................................................................

2-3-1 Cooling Operation...............................................................................................

02-06

2-3-2 Heating Operation...............................................................................................

1-2-5 Indoor unit connection check procedure ............................................................. 01-08

1-2-6 Test run from the outdoor unit ............................................................................ 01-09

1-2-7 Test run from the Remote controller .................................................................... 01-09

CONTENTS

3-2 MASTER CONTROL..................................................................................................

3-1-2 "AUTO" Position...................................................................................................

3-1-1 Fan Speed Setting...............................................................................................

3-1 FAN CONTROL..........................................................................................................

3. INDOOR UNIT OPERATION

3-2-1 Operation Mode Control.......................................................................................

3-2-2 Auto Changeover.................................................................................................

03-01
03-01

03-01
03-02
03-02
03-04

3-3 LOUVER CONTROL..................................................................................................

3-2-3 "COOL" Position..................................................................................................

03-05

3-2-4 "HEAT" Position..................................................................................................

03-05
03-06

3-5 DRAIN PUMP OPERATION.......................................................................................

3-4 ELECTRONIC EXPANSION VALVE CONTROL......................................................

3-6 FUNCTION..................................................................................................................

03-09
03-09
03-10

3-6-1 Auto Restart.........................................................................................................

03-10

4-1-2 Outdoor Unit Display...........................................................................................

4-1-1 Indoor Unit Display..............................................................................................

4-1 NORMAL OPERATION..............................................................................................

4. TROUBLE SHOOTING

4-2 ABNORMAL OPERATION.........................................................................................

4-2-1 Indoor Unit Display..............................................................................................

04-01
04-01

04-02

04-03
04-03

4-2-4 Remote Controller Display...................................................................................

4-2-3 Error Code List for Outdoor Unit..........................................................................

4-2-2 Outdoor Unit Display...........................................................................................

4-3 TROUBLE SHOOTING..............................................................................................

04-04
04-05

4-2-5 Error Code List for Simple and Wired Remote Controller...................................

04-07

4-2-6 Error Code List for Group Remote Controller......................................................

04-07

4-2-7 Error Code List for External Switch Controller.....................................................

04-07

+1

4-2-8 Error Code List for Signal Amplifier.....................................................................

04-07

+1

4-2-9 Error Code List for Network Convertor................................................................

04-07

+1

4-2-10 Trouble Level of System.....................................................................................

04-08

04-06

04-11

4-3-3 Trouble Shooting for Optional Parts....................................................................

4-3-2 Trouble Shooting With Error Code (OUTDOOR UNIT).......................................

4-3-1 Trouble Shooting With Error Code (INDOOR UNIT)...........................................

04-11
04-22
04-63

4-4 SERVICE PARTS INFORMATION............................................................................ 04-84

3-6-2 Icing Protection Control.......................................................................................

03-10

3-6-3 Oil Recovery Operation.......................................................................................

03-10

3-7 TIMER CONTROL......................................................................................................

03-11

3-7-1 Wireless Remote Controller................................................................................

03-11

3-7-2 Group Remote Controller..................................................................................... 03-13

3-7-3 Wired Remote Controller..................................................................................... 03-15

4-2-11 Error History Mode..............................................................................................

04-10

CONTENTS

5-2-1 Indoor Unit............................................................................................................

5-2 WIRING DIAGRAM....................................................................................................

5-1 REFRIGERANT CIRCUIT..........................................................................................

5. APPENDING DATA

5-3-1 Pressure sensor..................................................................................................

05-01

05-02

05-02

5-2-2 Outdoor Unit.........................................................................................................

05-15

5-3 CHARACTERISTICS OF SENSORS........................................................................

05-16

05-16

5-3-2 Thermistor resistance..........................................................................................

05-17

5-3-3 Saturation temperature and saturation pressure tables (R410A)........................

05-18

5-3-4 Temperature and pressure of refrigerant (Graph)...............................................

05-19

6. DISASSEMBLY PROCESS

1. TEST RUN

Before execution

Execution 1/2

Location decision

Execution procedure and precautions Reason

01-01

1-1 EXECUTION PROCEDURE AND EXECUTION PRECAUTIONS

1. TEST RUN

Sleeve and insert work

Indoor unit installation

Refrigerant piping work

Drain piping work

Duct work

Heat insulation work

Electrical work

Outdoor unit foundation work

Outdoor unit installation

Refrigerant piping connection work

Air tightness test

Vacuum drying

Use new refrigerant piping of the thickness specified by the
D&T manual.
Since R410A dedicated tools are necessary, prepare them in
advance.
Absolutely avoid use of existing piping. If use of existing
piping is unavoidable, the piping must be cleaned.

Use pipe that is not dirty inside.
Confirm the design for the piping ( Diameter, Thickness )
When the pipe is left standing, protect it.
Confirm the angle of separation tube and header correctry.
Finish flaring exactly.
Confirm the width across flats dimension and shape of flare nuts.
Always blow nitrogen while brazing.
Perform flushing before connecting the equipment.

Always make the downward slope of the drain pipe 1/100 or
greater and make the horizontal length within 20m.
Use hard polyvinylchloride pipe as the drain pipe.
Support the drain pipe between 1.5 to 2.0m.
Use pipe of 1 rank up (VP30 or greater) as central piping.

Prevention of water leakage

Foreign matter, water, etc. in the
piping will cause faulty cooling and
compressor trouble.
Incorrect pipe diameter will cause
faulty cooling
Incorrect angle of separation tube or
header will be cause poor cooling or
refrigerant noise problem
Refrigerant leakage will cause low
performance and abnormal stopping

Prevention of water leakage

Prevention of water leakage

Refrigerant leakage will cause low
performance and abnormal stopping.

Refrigerant leakage will cause low
performance and abnormal stopping.

Mixing in of vacuum pump oil by
reverse flow will cause equipment
trouble.

Always use a level and keep the indoor unit level.
If the equipment is tilted toward the drain port, install it so that the tilt
is within 10mm. Excessive tilt will cause water leakage.

Select the size of the heat insulating material according to the ambient
temperature and relative humidity of the refrigerant.
Use a heat insulating material having a heat conductivity of 0.043W/
(m.k) or less.

When making flare connections always use a torque wrench and
tighten the flare nut positively to the specified torque.

Pressurize the product with nitrogen gas up to the design pressure
and conduct a 24Hr air tightness test.

Install a vacuum pump with reverse flow check mechanism or a
reverse flow check adaptor to a conventional vacuum pump and
use.
Pump down sufficiently.
Approximately 1 hour or longer after -0.10MPa reached.
Allow to stand for approximately 1 hour after stopping the vacuum
pump and confirm that the needle does not return.
Air purging using refrigerant is strictly prohibited.

1

1

1

2

3

2
3
4
5
6

1

2
3
4

2

3

Vaccuming mode

This function is used for vacuuming the indoor unit and the connection piping.

Note: For starting Vaccuming mode, the refrigerant address setting has to be finished.

When the [vacuuming mode] is set, <Push switch setting, F3:21>
EEV of connected all indoor units opens.
So, the vacuuming indoor unit and piping becomes easier.

When the vacuuming ends, please turn off the power supply for all of the indoor units and
the outdoor unit, [vacuuming mode] is released.

*

recommend the vacuuming mode

Do not install the units in the place not recommended in the installation
manual.

The performance may drop significantly
due to the protection controlling

Use of a refrigerant other than the
specified refrigerant will invite
equipment trouble

Confirmation of Refrigerant used

Preparation of execution drawings

Confirmation of installation site

Preparation before execution

Check the characteristics of the refrigerant used and grasp the
special features of the refrigerant. If refrigerant must be charged,
always charge the refrigerant specified for the product.

*Confirm the product design pressure. < R410A 4.20MPa >

Prepare the design for the system

Secure the necessary pressure
resistance.

When performing piping work, observe the following items so that the
inside of the piping is clean and air tight.

7
8

01-02

[Note] Perform in the power OFF state.

Execution 2/2

Set according to the length of the connection piping.
Set to "Standard (40 to 65m)" at the factory.
Set using the push button SW on the outdoor unit main PCB.
< Refer to the Page 01-16 Setting mode F2-00 >
Set the pipe length to be the nearest indoor unit from the outdoor unit

Set the refrigerant circuit address and indoor unit address.
Can be set by rotary SW on the indoor unit PCB ( Main PCB or Switch
PCB) or from a remote controller or from a push button SW on the
outdoor unit Main PCB < Automatic address setting,
Refer to the Page 01-07 Setting mode F3-11>

Initial setting

Gas leak test

Use an R410A dedicated leak tester to check for gas leaks.

1

2

3

Confirm the additional refrigerant amount with the installation
manual, etc.
Always take the R410A refrigerant from the cylinder liquid phase
and charge it using the gas phase.
(Do not lay a cylinder with siphon pipe on its side.)
Use an R410A dedicated gauge manifold and charging hose.
Charge refrigerant using the liquid pipe.
When the defined amount of refrigerant cannot charge using the
liquid pipe, charge refrigerant using the gas pipe while opearing
the cooling test run.
Charge refrigerant bit by bit with cautious operation of valve
for the liquid refrigerant back prevention.

If taken from the air phase, since the
composition of the refrigerant which is
charged will change, low performance
and abnormal stop will occur easily.
Prevent erroneous sealing in of
refrigerant.

A leak tester for other than R410A
cannot detect leaks.

Set the refrigerant circuit address.

ROTARY SW: REF ADX10, X1

4

Turnover & explanation of operation

Address setting for Indoor unit

Test run & adjustment

Piping length setting

Addition refrigerant charging

5

Indoor unit connection check

[Note] Perform setting by push button SW on the outdoor unit Main PCB in the power ON state
after all indoor units have stopped operation.

When setting the address of Signal amplifier, please refer to the
installation manual of the signal amplifier.
The address setting can be set by automatically from 1 outdoor unit
on the network. < Refer to the Page 01-06 Setting mode F3-10 >

Address setting for Signal Amp

- When using signal Amps -

[Note] Manual setting: Set the rotary SW on the PCB in the power OFF state.

Automatic address setting:

Perform setting by push button SW on the outdoor unit Main PCB in the

power ON state after all indoor units have stopped operation.

[Note] Perform in the power ON state after all indoor units have stopped operation

[Note] Manual setting: Set the rotary SW on the PCB in the power OFF state.

Automatic address setting:

Perform setting by push button SW on the outdoor unit Main PCB in the

power ON state after all indoor units have stopped operation.

Dual address setting No. is not
allowed in one network.

When the setting is not same as the
real piping length, the system may
not work correctly.

Dual address setting No. is not
allowed in one network.

Dual address setting No. is not
allowed in one network.

Normal operation will not be possible
without performing the indoor unit
connection check.

Before starting the system, check on the number of indoor units and
the total capacity.
< Refer to the Page 01-08 Setting mode F3-12 >

Execution procedure and precautions Reason

1

2

Confirm the DIP SW setting
SET 1: Factory setting, SET 2 : All OFF, SET 3 : All OFF,
SET 4: Factory setting

If the DIP SW setting is wrong, the sys­ tem may not work correctly

3

Confirm the Terminal resister setting
SET 5-4 OFF: Disable, ON: Enable

If the Terminal resister setting is wrong,
the system may detect transmission
error

If the pipe length is set as the farthest
indoor unit, the nearest operating
indoor unit may be stopped the
operation by the icing up protection
as by over cooling.

Outdoor unit: 32A ( AJ*A36,45,54LALH )

Indoor unit: 20A

Leakage current: 30mA 0.1sec or less

Install a breaker (Included with Earth Leakage Circuit Breaker) in accordance

with the related laws and regulations.

Outdoor unit: 6mm

2

2 wires + Ground 4mm

2

Indoor unit: 2.5mm2 2 wires + Ground

Outdoor unit side: AC 230V (220-240V)

Indoor unit side: AC 230V (220-240V)

Use crimp-type terminals with insulating sleeves for stranded conductor cable

Power

source

Shall be no scratches, deformation, etc. (Be careful of deformation of the front panel)

Shall be checked and entered in the check sheet.

Shall be checked and entered in the check sheet.

Connection points check & loose terminal block screws check

0.33mm2, shielded wire used (22AWG)

Connection points check & loose terminal panel screws check

Check whether or not the heat insulation material is installed without a gap.

DIP SW SET1, SET4 : Factory setting, SET2,SET3, SET5-1,2,3: ALL OFF
Terminal resistor setting SET5 - 4 OFF: Disable, ON: Enable
Check the resistance value for each network segment

Refer to the installation manual 7.7

Refrigerant circuit address setting (SET : REF AD x10 and REF AD x1)

Comparison of calculated value and value written on electrics box. Entered in check sheet.

Refer to the installation manual 8.3.2

Gas pipe: fully open

Liquid pipe: fully open

There shall be no scratches, deformation, tilting, etc.

Shall be checked and entered in the check sheet.

Shall be installed positively.

Connection points check & loose terminal panel screws check

0.33mm2, shielded wire used (22AWG)

Connection points check & loose terminal panel screws check

0.33mm

2

Connection points check & loose terminal panel screws check

Check whether or not the heat insulation material is installed without a gap.

Refrigerant circuit address (REF AD)

Indoor unit address (IU AD)

At automatic address setting, IU AD/REF AD shall be [0].

Remote controller address (RC AD)

Function setting (Remote controller custom code/ external input switching/

auxiliary heater ON-OFF)

Indoor

unit

Outdoor

unit

Judgement standard

Check

Check contentsProcedure

1-2 TEST RUN METHOD

1-2-1 Check Items Before Power ON

01-03

[Note] If operated with the 3-way valve closed, the oil discharged from the compressor will not be returned
and will lead to trouble.

Circuit breaker capacity

Type of power source
wiring

Supply power source

Appearance

Serial No.

Drain cap installation

Power source wiring connection

Type of communication line

Communication line connection

Type of remote controller wiring

Remote controller wiring connection

Connection piping

Rotary SW setting

DIP-SW setting

Appearance

Serial No.

Outside air temperature

Power source wiring connection

Type of communication line

Communication line connection

Connection piping

DIP-SW setting

Rotary SW setting

Additional refrigerant amount

3-way valve

Wiring on terminal blocks

Addresses shall be assigned to all indoor units / Signal amps.
Check for unset or duplicated addresses.
< For the setting, Refer to the page 01-06, 07 >

All the indoor units in the same refrigerant

circuit

shall enter the coolingtest run

state.

The outdoor units corresponding to the operation capacity of the indoor

units shall operate. < Test operation procedure, Refer to the page 01-09,10 >

Cooling

test run

All of the

indoor units

operation

(after 30 mins)

Automatic address setting

Address read

Outdoor unit circuit breaker ON

Indoor unit circuit breaker ON

Check lighting of Main PCB LED101 and 7-segment display.

Check whether or not indoor unit OPERATION and TIMER lamps flash alternately.

Address

setting/

check

There shall be no Error information on the 7-segment display on the Main PCB.

Between L - N AC230V (220-240V)

These shall be no abnormal sound or abnormal vibration.

The outdoor fan shall not make a moaning sound.

There shall be no discharge air leaking from the outdoor duct.

There shall be no pipe chattering sound or flute sound generated.

HPS: 2.7 MPa

LPS: 0.9 MPa

TH1: 81°C

TH4: 15°C

TH21: 27°C

TH22: 11°C

TH24: 13°C

Shall operate corresponding to the operation capacity of the indoor units.

Service tool used, output (CSV Excel)

Outdoor unit push button

SW operation

<On service tool>

High pressure

Low pressure

Discharge pipe temperature (outdoor unit)

Suction pipe temperature (outdoor unit)

Inlet air temperature (indoor unit)

Heat exchange inlet temperature (indoor unit)

Heat exchange outlet temperature (indoor unit)

Compressor operation

Data output

1-2-2 Check Items After Power ON

01-04

Function setting

Are the necessary functions set ?
< For the setting, Refer to the page 01-15 18 >

Outdoor unit Main

PCB push button
SW setting/check

[Note]
Cooling test run for each refrigerant circuit.
If multiple refrigerant circuits are test run at the same time, refrigerant circuit address setting errors cannot
be detected.

Judgement standard

Check

Check contentsProcedure

Power ON

Inlet air temperature and outlet air temperature difference shall be 10°C or

greater.

There shall be no abnormal sound or abnormal vibration.

There shall be no water leakage. There shall be no condensation on the drain,

cabinet, piping, and discharge port.

Shall operate according to the settings. (ON-OFF, set temperature change)

<Indoor unit service tool + actual measurement>

Outlet air temperature

Abnormal sound/abnormal vibration

Water leakage check

Remote controller operation

<Outdoor unit>

Outdoor Main PCB 7-seg. display

Operation voltage

Abnormal sound/

abnormal vibration

[Note] Turn on all indoor units power in the same refrigerant circuit address.
When the system operates with the indoor units remaining no power, it is cause of malfunction.

Indoor unit connection check

Are the number of connecting indoor units correct ?
Is the total capacity of indoor units correct ?
< For the checking, Refer to the page 01-08 >

Indoor unit

connection check

Address record

Address hold check

All the indoor units and outdoor units of the same refrigerant circuit can be
checked on the service tool.

Enter the set addresses in the check sheet.

Check whether or not the address setting is held by the service tool
after indoor/outdoor circuit breakers were turned OFF to ON.

[Note] Before connecting service tool, the address setting has to be completed.

〜

Fan operation

Louver operation (except duct)

Outlet air temperature

Abnormal sound/abnormal vibration

Water leakage check

Remote controller operation

Indoor unit

individual

operation

Shall be switched to all fan speeds in the cooling mode.

Louver shall be switched to all positions. Shall also swing.

Inlet air temperature and outlet air temperature difference shall be 10°C or

greater.

There shall be no abnormal sound or abnormal vibration.

There shall be no water leakage. There shall be no condensation on the drain,

cabinet, piping, and discharge port.

Shall operate according to the settings. (ON-OFF, set temperature change)

01-05

Judgement standard

Check

Check contentsProcedure

These are representative figures of AJYA54LALH at the standard condition. ( Indoor : 27

°C, Outdoor : 35°C )
If conditions are different from those above mentioned, the figures will be changed slightly.
It depends on following conditions.

Outdoor unit capacity
Indoor and outdoor temperature
Indoor unit capacity
Pipe length
etc

<Indoor unit service tool + actual measurement>

1. Error occured

- Check on the Error code on the Remote controller or Indoor unit or Outdoor unit or Service tool and
check the description of the Error code.
< Refer to the Trouble shooting in the Service manual.>
< Refer to the Execution of precautions 1-1 and Check item Before power ON 1-2-1>

2. No good performance without error code

- Check if the protection controlling is operating or not
Evaporator Icing up protection, High discharge temperature protection,etc.
< Refer to the part of protection controlling in the Service manual >

- Check on the refrigerant circuit
Refrigerant amount, Pipe blockage, Wrong position of separation pipes etc.
< Refer to the Execution of precautions 1-1 and Check item Before power ON 1-2-1>
< Refer to the regulation of installation in the Installation manual>

Trouble shooting on Test run operation

01-06

1-2-3 Automatic address setting for signal amplifiers When using signal amplifiers

When setting the address of the signal amplifier, please use the factory setting. (See the
installation manual of the signal amplifier)

When the system is normal, nothing will be displayed on the 7 segment display.

When ERROR is displayed, inspect the units.
Use the “MODE/EXIT”, “SELECT”, and “ENTER” buttons on the outdoor unit Main PCB
to conÞ gure settings according to the procedures below.

1: FUNCTION Setting

First 2 digits Last 2 digits

(the display when the main power is turned on)

(When [F4] to [F9] are displayed, continue to press the "SELECT" button
until [ F3 ] is displayed)

MODE/EXIT

SELECT

SELECT

ENTER

SELECT

ENTER

Automatic address setting for

signal ampliÞ ers

Press the “SELECT” button until "10" is displayed

Press the “ENTER” button for more than 3 seconds

* Setting is complete when the number of unit is displayed

End

ENTER

MODE/EXIT

SWITCH POSITION

SW107 SW108 SW109

MODE

/EXIT

SELECT ENTER

LED101

(GREEN)

POWER

MODE

LED105 LED104

LED102

(RED)

ERROR

Push button switch

7 Segment
LED Lamp

Outdoor unit printed circuit board

*

01-07

SWITCH POSITION

SW107 SW108 SW109

MODE

/EXIT

SELECT ENTER

LED101

(GREEN)

POWER

MODE

LED105 LED104

LED102

(RED)

ERROR

Push button switch

7 Segment
LED Lamp

Outdoor unit printed circuit board

Check that the rotary switch IU AD on the indoor unit Main PCB is set to “00”.If it is not
set to “00”, it means the address of that device is not set. (Factory default is “00”).

Turn on the power of the indoor and outdoor units.

When the system is normal, nothing will be displayed on the 7 segment display.
When ERROR is displayed, inspect the units.

Use the “MODE/EXIT”, “SELECT”, and “ENTER” buttons on the outdoor unit Main PCB

to configure settings according to the procedures below .

1: FUNCTION Setting

First 2 digits Last 2 digits

(the display when the
main power is turned on)

(When [F4] to [F9] are displayed,
continue to press the “SELECT”
button until [F3] is displayed.)

MODE/EXIT

SELECT

SELECT

ENTER

1-2-4 Automatic address setting for Indoor units

It may take about 10 minutes for completing
the processing.

End

First 2 digits

Last 2 digits

Press the “SELECT” button until
“11” is displayed.

Press the “ENTER” button for more
than 3 seconds.

Automatic address setting
for indoor units

The number of indoor units with normal set­tings will be displayed at the first 2 digits of

the 7 segment display. The number of indoor
units with error will be displayed at the last 2
digits.

NOTE) After the “ENTER” button is pressed, the

end processing will occur for about 30 seconds.

During this period, the 7 segment will blink.

ENTER

SELECT

ENTER

Error

Found

01-08

SWITCH POSITION

SW107 SW108 SW109

MODE

/EXIT

SELECT ENTER

LED101

(GREEN)

POWER

MODE

LED105 LED104

LED102

(RED)

ERROR

Push button switch

7 Segment
LED Lamp

Outdoor unit printed circuit board

1-2-5 Indoor unit connection check

Please perform the indoor unit connection check according to following procedures.

MODE/EXIT

SELECT

SELECT

SELECT

ENTER

LED105

LED104

ENTER

Set to Function mode [F3].

(When [F4] to [F9] are displayed,
continue to press the “SELECT”
button until [F3] is displayed.)

Press the “SELECT” button until
“12” is displayed.

When indoor unit connection check
can not be performed

Turn on the power •
of indoor unit and
outdoor unit.

Press the •

“ENTER”

button for

more than 3 seconds.

This will be displayed when the •
Indoor unit connection check
starts.

MODE/EXIT

SELECT

ENTER

ENTER

ENTER

(*1)

(*2)

(*1) The number of connected

indoor units

(*2) Volume ratio of the indoor

units connection

Ex.) When 8 units are connected

Ex.) When the ratio is 120%

Please refer to the following “Error code”
for details

[ Note ] Error code

22.1: Connecting Indoor units capacity error

24.2: Connecting number of indoor unit error

26.1: Dual address number is existing

Other Error code: Refer to the Trouble shooting

When it finishes normally, nothing will be displayed on
7 segment display.

When error occurs

Confirm the number of connected indoor •
units and the volume ratio of the indoor
units connection.

Exit indoor unit connection check •
mode.

01-09

1-2-6 Test Run From Outdoor Main PCB

All the indoor units connected to the outdoor unit can be test-operated by push button setting.

LED105 LED104LED105 LED104 LED105 LED104LED105 LED104

L

ED

1

0

5

L

ED

1

0

4

LED105 LED104

LED105 LED104

[ Cooling test run ]

[ Heating test run ]

[ Test run stop ]

LED105 LED104

LED105 LED104

LED105 LED104

LED105 LED104

Press the ENTER button for at least 3 seconds.

Press the "ENTER" button or Time out ( 5 seconds)

MODE / EXIT

< Pursuance completion >

< Monitoring condition >

< Mode select condition >

< Return to mode select condition >

< Fuction select condition >

[ Function mode ]

SWITCH POSITION

SW107 SW108 SW109

MODE

/EXIT

SELECT ENTER

LED101

(GREEN)

POWER

MODE

LED105 LED104

LED102

(RED)

ERROR

Push button switch

7 Segment
LED Lamp

Outdoor unit printed circuit board

TEST RUN SETTING

[ Monitoring mode ] [ Setting mode ]

[ Error history mode ]

For a detailed description of push button operation, refer to the [D&T manual Chapter 6. SYSTEM DESIGN]

LED105 LED104

< Return to monitoring condition >

example, Normal indicate : [ Cooling mode ]

[ Central control setting
Forced reset ]

There are the following 2 methods of resetting test operation.

Automatic reset when 60 minutes has elapsed.(1)

Reset when operation stop was performed.(2)

Note

SELECT

SELECT

SELECT

SELECT

SELECT

SELECT

ENTER

ENTER

ENTER

MODE / EXIT

1-2-7 Test Run From Remote Controller

Press the TEST RUN button on the remote controller, while the air conditioner is running.
To end test run operation, press the remote controller START / STOP button.

When the air conditioner is being test run, the OPERATION
and TIMER lamps of indoor unit flash slowly at the same time.

START / STOP button

TEST RUN button

2. Standard wireless remote controller

Stop the indoor unit. Push the button and
button simultaneously for more than two seconds.
The air conditioner will start to conduct a test run and " " will display on
the remote controller display.
However, the , setting button does not have function,
but all other buttons, displays, and protection functions will operate.

To stop test run, push the START / STOP button of the standard wired remote
controller.
For the operation method, refer to the operating manual and perform operation
check.
Check that there are no abnormal sounds or vibration sounds during test run
operation.

Perform the test operation for 60 minutes.

1. Standard wired remote controller

UTY - LNH

UTY - RNK

button

button and

Stop the indoor and outdoor units. Push the remote controller
simultaneously for more than three seconds. The air conditioner will start to conduct a test
run and " " will display on the temperature display.

SET

However the setting button does not have function but all other buttons,
displays and protection functions will operate.

To stop test running press the button of the simple remote controller.
For the operation method refer to the operating manual and perform operation check.
Check that there are no abnormal sounds or vibration sounds during test run operation.

3. Simple remote controller

UTY - RSK

01-10

TIMER MODE

CLOCK
ADJUST

TEST
RUN

RESET

TIMER

SLEEP

FILTER RESET

SWING

SET

SET

ECONOMY

FANMODE

START

STOP

SET

TEMP.

TIMER MODE

DAY

SET BACK

CLOCK ADJUST

DAY OFF

TIMER DELETE TIMER SET

FAN MODE

SET TEMP.

START / STOP

6)

or

[ Select All (F2) ]: All of R.C.Group (Indoor units)
[ Identify Unit (F3) ] : Specific R.C.Group (Indoor unit)

Setup Menu

Indoor unit Special Setting

Test Operation

Central Controller
Setting

Indoor unit
Special setting

Indoor Unit
Set Temp. Range

Filter Sign

R.C. Prohibition

Group

Select
All

Identify
Unit

Clear
Unit

On

Select
All

Details

Off

Operation

Help

Setup
Menu

Monitor
Group

1

2

Monitor - All

UTY-DCG

On

Coll

25.0

℃

05/31 03:59

05/31 03:59

05/31 03:59

Test Operation

05/31 03:59

RCG_05

Test run operating procedure

<Monitor screen (icon)>

<Monitor screen (list)>

(1)

(1)

(2)

( * )

(1)

(1)

(2)

( * )

01-12

5. Touch panel controller

UTY - DTG

(1) Select the objective you want to test run.
Select the objective icon or list at the monitor screen. (Multiple selections is possible)
Select all the devices registered as objectives by pressing "Select All" on the monitor screen.

(2) After objective selection at (1), switch to the <Setting screen> by pressing "Operation".

On

C

1

On

On

On

On

On

On

On

On

Office B

Conference

A

Conference B

Meeting 1

Meeting

2

Parking lot

Meeting

3

Entrance

Restrant

Room

101

Office A

PC Room

Top Up

Down

List

Heat

Auto

Cool

26.0 C

24.0

C

Auto

22.0

C

Auto

24.0 C

21.5 C

Heat

21.5 C

21.5 C

Cool

Off

Off

Off

All

21.0

C

Heat

All

Lange Group

Lange Group

Top Up

Down

List

Office A

PC Room

Room 101

Restrant

Entrance

Meeting 1

Off

Off

Off

Mixed

Heat

Auto

Cool

24.0 C

26.0 C

Low

Auto

21.5 C

High

Office B

Mixed Mixed Mixed

Mixed

Name

Expand

Status Mode

Set
Temp

Fan

R/C
Prohibit

On

On

On

Status: On

Status: On

10/11.2008.Mar. 02:20 PM

10/11.2008.Mar. 02:20 PM

Monitor Mode

Monitor Mode

Heat

21.0

C

Off

On

Operation

Clear All

Select All

Schedule

Setting

Off

On

Operation

Clear All

Select All

Setting

Schedule

Group
Error

Schedule
Filter Sign
Op. Controlled
Op. Restricted

RC Prohibition
All
On/Off
On

Mode
Temp.
Timer

Filter

Mode
Set Temp.

Group
Error

Schedule
Filter Sign

Op.Controlled
Op.Restricted

<Setting screen>

(3) Switch to the <Details setting screen> by pressing "Optional Setting" on the setting screen.

<Details setting screen>

(4) Send (start) test run by pressing "Start" and then pressing "OK" on the details setting screen. Test run continues for 60 minutes.
During sending, the slave screen shown below is displayed. When sending is completed, the sending slave screen and details setting
screen are closed.

To interrupt test run, select the device being test run and execute an
operation stop command.

(*) At the monitor screen, test run is reset by stopping operation
of the objective devices by pressing "OFF".
(*) Or test operation is reset by stopping operation of the objective
devices by pressing "Off" of Operation and then pressing "OK"
on the setting screen.

01-13

(3)

(4)

(5)

( * )

Cancel

Off

On

OK

Transferring data. Please wait.

On

On

Reset

Cancel

Stand by (Defrost)
Stand by (Oil Recovery)
Test Operation

Start

Air Flow Direction

Economy

Anti Freeze

Filter Sign

Operation

Test

Up

Down

Swing

Swing

Left Right

Off

Off

Special State

Status: On

1

2

3

4

5

1

2

3

4

SettingOptional

Cancel

OK

On

Off

Auto

Auto

Cool

Dry

Fan

Heat

Operation
Controlled

High

Med

Low

Quiet

Meeting Room

24.0 C

operation

R/C Prohibition

Mode Set Temp. Fan

Optional

Setting

All

On/Off

Filter

Timer

Temp.

Mode

On

10/11.2008.Mar. 02:20 PM

10/11.2008.Mar. 02:20 PM

Air Flow Direction
Economy
Anti Freeze
Filter Sign
Test Operation

Control Unit :

Operation Setting

Operation Setting

OK

Status: On

1-3 TEST RUN CONTROL

01-14

1. When the test run signal is transmitted from standard wired, wireless remote controller,
simple remote controller, transmitted network, and outdoor unit.

(1) The test run operation starts and the electric expansion valve is controlled to a maximum flow, regardless of
the temperature condition.

(2) Frost prevention operation has priority over item(1).
(3) Whether state of the indoor unit operates or stops, All units in the same refrigerant circuit will start to conduct a
test run in accordance with the operation mode set by push switch of outdoor unit ( see 1 - 2 - 3 ).
(4) After 60 minutes passes, the test run stops.
(5) Test running initialization is shown below.

Fan speed Hi Hi

Room Temperature Indication 18 30

Hi Hi

18 30

Vertical Air Direction Panel

Swing

Operating Mode

Cooling Heating Cooling Heating

OFF OFF

Position

1

Position

4

EXCEPT FOR THE DUCT MODEL DUCT TYPE

CEILING TYPE

COMPACT CASSETTE TYPE

COMPACT WALL MOUNTED TYPE

4

3

2

1

1

2

3

4

*EXAMPLE

1

2

3

4

4

3

2

1

Push switch onoutdoor
unit PCB

00 Connected number of indoor unit The number of the communicating unit is displayed

01

Software version :

[ ] [ ] [ ] [ ] [ ] displays by five items

It skips when there is no suffix

02 Software version of INV PCB

03 Software version of communication PCB

Operation of
each part

10 Rotational speed of outdoor unit fan motor The rotational speed of the outdoor unit fan motor is displayed

[ rpm ]

11 Rotational speed of INV compressor The rotational speed of the compressor is displayed

[ rps ]

12 Current value of INV compressor Current value of INV compressor is displayed

[ A ]

14 Pulse of EEV1 Pulse of EEV1 is displayed

[ pls ]

15

Pulse of EEV2 Pulse of EEV2 is displayed

[ pls ]

Time guard 20 Accumulated current time Accumulated current time is displayed

[ 10 hour ]

21 INV compressor accumulated time

[ Cooling ]

Accumulated time is displayed in the cooling operation of the
INV compressor
[ 10 hour ]

22 INV compressor accumulated time

[ Heating ]

Accumulated time is displayed in the heating operation of the
INV compressor
[ 10 hour ]

Refrigerant
cycle data 1

30 Information on Thermistor 1

( INV compressor discharge temperature )

The value of the Thermistor 1 is displayed

32

Information on Thermistor 3

( Outdoor temperature )

The value of the Thermistor 3 is displayed

33 Information on Thermistor 4

( Suction temperature )

The value of the Thermistor 4 is displayed

34

Information on Thermistor 5

( Heat-exchanger temperature )

The value of the Thermistor 5 is displayed

36

Information on Thermistor 7

( Liquid temperature 2 )

The value of the Thermistor 7 is displayed

37

Information on Thermistor 8

( Sub-cool heat-exchanger inlet temperature )

The value of the Thermistor 8 is displayed

38 Information on Thermistor 9

( Sub-cool heat-exchanger outlet temperature )

The value of the Thermistor 9 is displayed

39 Information on Thermistor 10

( INV compressor temperature )

The value of the Thermistor 10 is displayed

50

Information on pressure sensor 1

( High pressure sensor )

The value of the pressure sensor 1 is displayed
[ MPa ] or [ psi ]

51

Information on pressure sensor 2

( Low pressure sensor )

The value of the pressure sensor 2 is displayed

[ F1 ]

Monitor mode

Setting Mode

ITEM
CODE No.

Information contents

Refrigerant
cycle data 2

Device and
system

Software version of outdoor unit

Classification

01-15

1-4 Field Setting And Monitor Mode List for Outdoor unit

[ MPa ] or [ psi ]

[°C ] or [°F ]

[°C ] or [°F ]

[°C ] or [°F ]

[°C ] or [°F ]

[°C ] or [°F ]

[°C ] or [°F ]

[°C ] or [°F ]

[°C ] or [°F ]

Setting Mode

ITEM
CODE No.

Setting Function

Default

Install 00 Pipe length setting 00 40-65m

Setting mode

01 0-40m
02 65-90m
03 90-120m
04

Correction 10

Sequential start shift

00
01
02
03

11

Cooling capacity shift 00 Normal mode

01 Save energy mode 1 (+2°C)
02 High power mode 1 (-2°C)
03 High power mode 2 (-4°C)

12

Heating capacity shift

00 Normal mode
01 Save energy mode (-2°C)
02 High power mode 1 (+2°C)
03 High power mode 2 (+4°C)

13 Defrost setting shift 00 End temperature:Normal

01 End temperature:Higher

01 Emergency stop

21 Operation mode selecting method 00 Priority given to the first command

01 Priority given to the external input of outdoor unit
02 Priority given to the master indoor unit

22

Snow falling protection fan mode

00 Normal operation
01

23

Interval setting for snow falling

00 Standard
01
02
03

24

High static pressure mode

00 Standard
01
02

28 Change of unit (Temperature) 00 Celsius(°C)

01 Fahrenheit ( F)

29 Change of unit (Pressure) 00 MPa

01 psi

Change of

Change of
function 3

30 Energy saving level setting 00 Level 1 (stop)

01 Level 2 (operated at 40% capacity)
02 Level 3 (operated at 60% capacity)
03 Level 4 (operated at 80% capacity)
04 Level 5 (operated at 100% capacity)

Low noise 40 Capacity priority setting 00 Off (quiet priority)

01 On (capacity priority)

41 Low noise mode setting

00 Off (Normal)

60

Back up operation

00 Standard
01

01 On (Low noise mode operation is always done)

42

Low noise mode operation level

00 Standard (47dB)
01

[ F2 ]

ITEM
CODE No.

Standard

20 Switching between forced stop or 00 Forced stop

Change of

function 1

emergency stop

protection fan mode

setting 1

(in low noise mode)

function 2

Classification

01-16

Push switch
on outdoor unit PCB

Setting is forbidden

Setting is forbidden

Setting is forbidden

Setting is forbidden

70

Electricity meter No. setting 1

(Set the ones digit and tens digit of the No of
the electricity meter connected to CN135.)

*3

00~99 Setting number x00~x99

00

71

Electricity meter No. setting 2

(Set the hundreds digit of the No. of the
electricity meter connected to CN135.)

*3

00~02 Setting number 0xx~2xx 00

72

Electricity meter pulse setting 1

(Set the ones digit and tens digit of the No. of
the electricity meter pulse setting connected
to CN135.)

*4

00~99 Setting number xx00~xx99 00

73

Electricity meter pulse setting 2

(Set the hundreds digit and thousands digit
of the electricity meter pulse setting connected
to CN135.)

*4

00~99 Setting number 00xx~99xx 00

Change of
function 4

*3 : When electricity meter No. is set to "000" and "201 to 299", the pulses input to CN135 become ineffective.
Available setting number is "001" to "200"
*4 : When the electricity meter pulse setting is set to "0000", the pulses input to CN135 become ineffective.
Available setting number is "0001" to "9999"

( Refer to Design & Technical Manual for details.)

( Refer to Design & Technical Manual for details.)

( Refer to Design & Technical Manual for details.)

( Refer to Design & Technical Manual for details.)

Setting is forbidden: Any of problems caused by changing these setting is not covered by the warranty.

14 Pressure equalization time shift

before defrosting start

00 No time shift

01 Shift 1 ( 30 sec.)
02 Shift 2 ( 60 sec.)
03
04

Shift 3 ( 90 sec.)

Shift 3 ( 120 sec.)

Only for solution :

Only when the refrigerant noise during Defrosting was pointed out. It is the case that the

compressor operating time in heating will be shorter.

Only for solution

04 High power mode 3 (-5°C)

03

Oil recovery

00

02

Setting is forbidden

01

25

Oil recovery Abnormal
low pressure protection control

00

01

26

27 Error code Notification

00
01

Enable
Disable

31

Heating Starting prosess

00
01

Standard

Standard

Standard

Setting is forbidden

Setting is forbidden

Setting is forbidden

Setting is forbidden

Setting is forbidden

Push switch on
outdoor unit PCB

Forced operation 00 Cooling test run

Forced thermostat-ON in Cooling.

Function mode

01 Heating test run Forced thermostat-ON in Heating.

02 Test run stop Test run is stopped.

Install and
maintenance 1

10 Signal amplifier automatic address Automatic address setting operates for signal amplifier.

11 Indoor unit automatic address

21 Vacuuming mode Vacuuming mode operatesRefer to page 01-01 for the function.

Clear 30 Error history clear All the abnormal code histories are cleared.

32 Current time clear Accumulated current time becomes [ 0 ]

33 INV compressor accumulated time clear Accumulated time of the INV compressor becomes [ 0 ]

35 Field setting all clear Return to default the all set items.

Reset 40 Abnormal reset It was displayed when abnormality occurs, and abnormal

code is reset.

This is a function that uses to clear abnormal display after the
repair is completed.

Please operate the switch after power off or power on
the outdoor unit.

Specialtyfunction 91 Foreced Central control function release

Maximum memorized indoor unit number is reset.

Setting Mode

ITEM
CODE No.

Setting Function

Install and
maintenance 2

*

Automatic address setting operates for indoor unit of same
refrigerant circuit.

[ F3 ]

01-17

Compressor Motor Loss of Synchronization
Compressor 1 Temperature Abnormal
Inverter Compressor Start Up Error
Discharge Temperature 1 Abnormal
Low Pressure Abnormal
Current Sensor 1 Error
Trip Detection
Rush Current Limiting Resistor Temp Rise Protection
Outdoor Unit FAN motor 1 Lock Error
Outdoor Unit FAN motor 2 Lock Error

< Reset Error Item List By Abnormal Reset Setting >

*

Push switch on
outdoor unit PCB

1 time ago (Newest)

Error History Mode

2 times ago

5 times ago

Meaning of Error History Number

ITEM
CODE No.

Information contents

[ F9 ]

00

01

02

03

04

05

06

07

08

09

Error history

10 times ago (Oldest)

4 times ago

3 times ago

6 times ago

7 times ago

8 times ago

9 times ago

When the centralized control device failure, and the centralized
control setting cannot be released, this function is used.

All the limitations set with the centralized control device are
released.

Maximum memorized indoor unit number reset

41

"E14.5:Indoor unit number shortage" error is cleared.

When the error occurred, the error code is memorized up to
10 on Main PCB.

If the memorized error code becomes over 10, the oldest one
will be erased.

Refer to Chapter 4.TROUBLE SHOOTING

4-2-3 Error Code List of Outdoor unit

12

The number of indoor units and the total capacity of indoor units
of same refrigerant circuit.

Indoor unit connection check

36

Clear memorized information of "F3 - 12 "
( Indoor unit connection check )

The information of the number of indoor units and the total
capacity of indoor units are cleared.

34 Constant Speed compressor accumulated

time clear

Not in Use on J-Series

90

Foreced Normal operation release Normal operation foreced release

01-18

1-5 Field Setting / Function Setting for Indoor unit

Setting Mode

ITEM
CODE No.

Setting Function

Default

Indoor unit field setting

Address

setting by
remote controller

01 Indoor unit address 00~63 00~63 00
02 Refrigerant circuit address 00~99 00~99 00

Filter 11 Filter indicator Interval 00 Default

01

Longer

02 Shorter

13 Filter sign display 00 Enable

01 Disable
02 Display only on central remote control

Airflow 20 Ceiling airflow 00 Default

(Cassette type only) 01 High ceiling

23 Vertical airflow direction 00 Default

01 Raise

24 Horizontal swing airflow direction 00 Default

01 Left half

02 Right half

Correction

30

Cool air temperature trigger

00 Default (0°C)

01 Temperature overshoot setting (+2

°C)

02 Temperature undershoot setting (-2

°C)

31 Heat air temperature trigger 00 Default (0°C)

01 Temperature undershoot setting (-6

°C)

02 Temperature slightly undershoot setting (-4

°C)

03 Temperature overshoot setting (+4

°C)

Change of 40 Auto restart 00 Enable

01 Disable

43 Cool air prevention 00 Enable

01 Disable (Ventilation mode)

46 External control 00 Start / Stop

01 Emergency stop

47 Error report target 00 All

01 Display only for central remote control

ITEM
CODE No.

Function 1

Classification

26

32

Model name Range of static pressure

AR XD 07L ATH

0 to 90 Pa

AR XD 09 LATH
AR XD 12LATH
AR XD 14LATH
AR XD 18L ATH
AR XD 24L ATH 0 to 50 Pa

00
01
02
03
04
05
06
07
08
09
31

0 Pa
10 Pa
20 Pa
30 Pa
40 Pa
50 Pa
60 Pa
70 Pa
80 Pa
90 Pa
25 Pa

Static Pressure setting

- Slim Duct Only -

The Range of static pressure is
different from one model to other.

Temperature correction in Auto

00
01

Disable
Enable (Nonfunctional on J2 Series)

2. OUTDOOR UNIT OPERATION CONTROL

2-1 INPUT / OUTPUT LIST

2. OUTDOOR UNIT

02-01

Input / output or kind of detail Control range

Discharge pressure sensor <HIGH> Pressure sensor Measure range 0.0 to 5.0MPa
Suction pressure sensor <LOW> Pressure sensor Measure range 0.0 to 1.7MPa
Discharge temperature sensor <TH1> Themistor <Blue>

Measure range 10 to 130

Heat exchanger temperature sensor <TH5> Themistor <Pink>

Measure range -35 to 70

Sub-cool heat exchanger (inlet) sensor <TH8> Themistor <White>

Measure range -35 to 70

Sub-cool heat exchanger (outlet) sensor<TH9> Themistor <Brown>

Measure range -35 to 70

Liquid temperature sensor <TH7> Themistor <Green>

Measure range -35 to 70

Suction temperature sensor <TH4> Themistor <Red>

Measure range -35 to 70

Outdoor temperature sensor <TH3> Themistor < - >

Measure range -25 to 58

Operation current sensor

Current transformer

Rotary SW & DIP-SW & Push SW

Electronic expansion valve 1 (Main) EEV coil Operating voltage DC12V
Electronic expansion valve 2 (SC-Hex) EEV coil Operating voltage DC12V

4-way valve 4-way valve coil AC220-240V, 50/60Hz 6/5 W
Solenoid valve Comp pressure equalizing valve AC220-240V, 50Hz, 6W
Crank case heater For Inverter Compressor AC240V, 25W
Base heater Field supply AC220-240V, 35W

LON WORKS
Inverter communication

External input 1 (CN131)
(Low noise mode operation)
External input 2 (CN132)
(Cooling / Heating priority)
External input 3 (CN133)
(Outdoor unit operation peak control)
External input 4 (CN134)
(Emergency stop operation)

Dry contact input

Single LED 101
Single LED 102

LED display

Address and function setting

Display the information on operation, error and setting with single LED and
7 segment LED.

Control output: DC 0/12-24V, Max.30mA
Control output: DC 0/12-24V, Max.30mA

External output 1 (CN136) (Error display)
External output 2 (CN137) (Operation display)

ON (Error) / OFF (Normal)
ON (Operation) / OFF (Stop)

Communication
Input / Output

External
Input / Output

I
N
P
U

T

O
U
T
P
U
T

Compressor temperature sensor <TH10> Themistor < - > Measure range 10 to 130

Pressure switch

Pressure switch

Open 4.2MPa Short 3.2MPa

Fan motor 1 (Upper) DC Brushless motor

7 Segment LED

Compressor

Magnetic relay

Operation coil AC220-240V, 50Hz

Indoor unit Outdoor unit

Fan motor 2 (Lower) DC Brushless motor

2-2-1 Operation / Stop Condition

When cooling requirement capacity or heating requirement capacity from either of the indoor units in the same
refrigerant circuit is input, the compressor operates.
When all the indoor units in no "cooling requirement capacity" or "heating requirement capacity",

the compressor
is stopped.
But in the following case, the compressor operates in accordance with operation of each mode.

During 3 minute restart prevention operation
Icing protection
Failure (Refer to chapter 4, TROUBLE SHOOTING )

Under expansion valve initialization
At protective operation

Emergency stop
Defrost operation

02-02

2-2 COMPRESSOR OPERATION

2-2-2 Capacity Control

(1) Capacity of compressor operation

By the operation of DC inverter rotary compressor, the amount of required refrigerant circulation acceding to
cooling and heating load can be supplied from compressor efficiently.

DC inverter rotary compressor is able to control the amount of
required refrigerant circulation in details.

Cooling/Heating load

Capacity of

compressor operation

Total capacity

Peak cut stop operation

Oil recovery

Inverter Compressor

(2) Target low-pressure and high-pressure control

In order to make the evaporation pressure of the indoor unit at the proper pressure on a variety of operations,
capacity of the compressor will be controlled by low-pressure sensor of the outdoor unit.

In order to make the condensation pressure of the indoor unit at the proper pressure on a variety of operations,
capacity of the compressor will be controlled by high-pressure sensor of the outdoor unit.

Target low-pressure and high pressure temperature depends on system capacity, capacity of compressor operation,
pipe length, and capacity shift switch settings.

<Cooling>

<Heating>

02-03

2-2-3 Speed Range of Start, Stop, And Operation

On stop mode : 0 rps

On operating mode : 20 - 100 rps

(1) Cooling starting process
For cooling operation only, the upper limit speed at starting is made 50rps and is raised in
+10rps increments every 60 seconds.

Speed

Time

0

50rps

60sec

Target speed

60sec

60sec

60rps

70rps

80rps

60sec

120sec 180sec 240sec

90rps

10rps

10rps

The compressor operates at the upper limit speed if the target speed is higher than the upper limit speed.

The compressor operates at the target speed if the target speed is lower than the upper limit speed.

60sec

10rps

02-04

Cancel conditions

Normal control

32rps fixed

(3) Limits the upper limit speed of the INV compressor according to the present high-pressure value.

(2) Heating starting process

At the start of heating, the compressor is started by the following process. Compressor start-up
to change the 4 way valve. Capacity control returns to normal control after the end of the starting process.
(target high-pressure control)

Starting process Starting process

Starting process

Starting process

3 minutes elapsed from start of process
or
High-pressure 2.63MPa

20 minutes elapsed from start of process
or
High-pressure 2.63MPa
or
Discharge SH 10 and Discharge temperature 10

[ a ] = 1.25 Low pressure value 2.125

High Pressure

3.60MPa

3.30MPa

(Maximum) 3.00MPa

Maximum speed = 80rps

Maximum speed = 90rps

Maximum speed = 95rps

Maximum speed = 100rps

[ a ]

< Starting process >

Compressor operates based on the required capacity at the start up, after that the target high-pressure
control begins.

*However, when the following condition (A) or (B) are satisfied, starting process is not performed.

< Conditions under which starting process is not performed >

(A) The compressor temperature 32 , when the room temperature reached to the setting temperature
( Thermostat - OFF controlling )

(B) The compressor temperature 32 , when the system keeps heating mode with stop condition

< Operation >

Compressor operation speed

4rps/Min

Switching conditions of step

2-3 FAN CONTROL

2-3-1 Cooling Operation

Fan step

11

10

9

8

7

6

5

4

3

2

1

0

780
700
660
660
670
590
540
540
450
410
340
340
270
250
390
0
340
0
290
0
250
0
0
0

AJ A36LALH AJ A45LALH AJ A54LALH

Fan speed (rpm)

02-05

(Conditions which lower the fan speed)
High-pressure saturation low limit of target high-pressure

saturation range and heat sink temperature 75°C

(Conditions which raise the fan speed)
High-pressure saturation upper limit of target high-pressure saturation or heat sink temperature 80°C

Fan step

7

5

2

0

Outside air temperature
sensor detected value

TAOUT 30°C

30°C TAOUT 20°C

20°C TAOUT 10°C

10°C TAOUT

The initial speed of the outdoor unit is detected by out door temperature sensor.

35 52

40.4

46.6

54

High-pressure saturation temperature

Outdoor temperature

Upper limit of target
high-pressure saturation
temp.

Low limit of target
high-pressure saturation temp.

Target high-pressure
saturation temp.

Thereafter, the high-pressure is monitoring at a
set time interval and the fan speed is changed
by the following conditions.

The fan is controlled to keep high puressure saturation temperature
within the target range as follows

780
700
660
660
670
590
540
540
450
410
340
340
270
250
390
0
340
0
290
0
250
0
0
0

780
700
700
700
670
590
540
540
450
410
340
340
270
250
390
0
340
0
290
0
250
0
0
0

Step

Upper FAN
Lower FAN

02-06

2-3-2 Heating Operation

Fan step

11

10

9

8

7

6

5

4

3

2

1

0

800
700
660
660
670
590
540
540
450
410
340
340
270
250
0
0
0
0
0
0
0
0
0
0

AJ A36LALH AJ A45LALH AJ A54LALH

Fan speed (rpm)

Switching conditions of step

Fan step

11

8

5

5

Outside air temperature
sensor detected value

TAOUT 10°C

10°C TAOUT 15°C

15°C TAOUT 20°C

20°C TAOUT

Thereafter, the high-pressure is monitoring at a set time interval and the fan speed is changed by the following conditions.

(Condition which lowers the fan speed)

High-pressure 3.30MPa and heat sink temperature 80°C

(Condition which raises the fan speed)
High-pressure saturation 3.20MPa or heat sink temperature 85°C

The initial speed of the first boot outdoor unit is detected by outdoor air temperature sensor value (TAOUT).

800
700
660
660
670
590
540
540
450
410
340
340
270
250
0
0
0
0
0
0
0
0
0
0

800
700
700
700
670
590
540
540
450
410
340
340
270
250
0
0
0
0
0
0
0
0
0
0

02-07

Capacity priority setting

Operation mode

Low noise level setting

ON

OFF

4HP

AJ*A36LALH

450

7

5HP

AJ*A45LALH

ON

ON

COOL

HEAT

«

Low noise mode and operation contents

»

( PUSH SW ) ( PUSH SW )

Normal operation

Low
capacity

Not switched for 30 minutes
after being once switched.

* Automatic switching

«

Settings and corresponding operations

»

LOW NOISE MODE

* Automatic switching

* Low capacity
Compressor capacity is low
or
High-pressure is high (high-pressure saturation 58°C) at cooling
or
Low-pressure is low (low-pressure saturation 0°C) at heating

Operation in low noise mode

When the low noise mode setting ON from PUSH SW or EXTERNAL INPUT, the outdoor unit operates in
the low noise mode as follows.

LOW NOISE MODE

The operating sound lowers from about 3 to 5 dB more than the rated value

Capacity does not become low
even when switched to low noise
mode

The operating noise is reduced by limiting the rotational speed of the compressor and fan motor

2-3-3

Low noise mode

410

40

450

7

410

45

450

7

410

52

450

7

410

60

450

7

410

60

450

7

410

60

6HP

AJ*A54LALH

Max FAN Step

Max FAN Step

Max Compressor Speed

Max Compressor Speed

Upper FAN
Lower FAN

Upper FAN
Lower FAN

Low Noise Mode

To accurately detect the outside air temperature, the fan is operated while the outdoor unit is stopped.

2-3-4 Other Control

02-08

EEV 1

EEV 2

EEV is controlled so that the system reaches closer to the target discharge temperature that is calculated from
high and low pressure.

< Cooling mode >

< Heating mode >

500 pulses basically.

Initialization
conditions

Control range

operation stop

500 pulses

55 - 500 pulses 0 pulses

0 pulses

2-4 EXPANSION VALVE CONTROL

Cooling

Heating

Operation mode

40 - 500 pulses

Cooling

Heating

When power
turned on
When operation
stopped

2-5 SPECIAL OPERATION

2-5-1 Oil Recovery Operation

Purpose of the operation

The amount of refrigerant lubricant oil which has been transported to the indoor units
and the connection pipe with the refrigerant will become large as the operation time of compressor increases.
It is necessary to recover the oil back into the outdoor unit for a certain time interval
in order to prevent compressors from damaging due to lack of lubrication oil.

During the oil recovery operation, appears on the display of wired and central remote controller,
and appears on the simple remote controller.
The operation indicators (LED) of the indoor units flash slowly.

Others

02-09

< Start condition >

Compressor accumulated operation time since last cooling oil recovery operation exceeds 3 hours (first time : 1hour)

< End condition >
30 seconds have elapsed since the start and "suction temperature - low pressure saturation temperature 5deg" or 6 minutes

have elapsed since the start.

< Operation >

COMPRESSOR: The rotation speed varies depending on the operation state.
EEV Opening (Indoor/Outdoor unit): Controlled pulse (as normal operation mode).
FAN speed (Indoor/Outdoor unit) : Controlled fan speed (as normal operation mode).

2. Oil Recovery in Heating operation

1. Oil Recovery in Cooling operation

< Start condition >

Compressor accumulated operation time since the last heating oil recovery exceeds 8 hours (first time : 1hour)

< End condition >
After 4 minutes have elapsed

< Operation >

COMPRESSOR: The rotation speed varies depending on the operation state.
EEV Opening (Indoor/Outdoor unit) : Controlled pulse (as normal operation mode)
FAN speed (Indoor/Outdoor unit) : Controlled fan speed (as normal operation mode)

02-10

2-5-3 Defrost Operation Control

Accumulated heating operation time is 40 minutes or longer
[Accumulated heating operation time is reset at the end of cooling operation or defrosting operation.]
and
an outdoor unit satisfies condition or below

Condition : "Heat exchange temperature -2°C" accumulated operating time is 180 minutes or longer

Condition : After the following all condition satisfied, "heat exchange temperature defrosting start judgment
temperature and during heat exchange liquid temperature drop" accumulated time:10minutes

(a) accumulated heating operation time 30 minutes
(b) 10 minutes have elapsed after outdoor unit starting
(c) 5 minutes have elapsed since oil recovery

* Defrosting start and end judgment temperature are determined by the outdoor temperature.

Defrosting start judgment temperature = 0.8 x outdoor temperature - 11.6 (However, -27.6°C to - 6°C)

At all outdoor units, heat exchange liquid temperature end judgment temperature
or
when 10 minutes have elapsed from the start
(When the indoor unit connection capacity is 90% or less, after 15 minutes have elapsed.)

Defrosting end judgment temperature = 0.39 x outdoor temperature + 12.7 (However, 5 to 12°C range)

If the calculated result is lower than -27.6 , the judgment temperature is defined as -27.6
If the calculated result is higher than -6 , the judgment temperature is defined as -6

2-5-2 Pre-heat Operation

This pre-heat operation protects the start up failure by preventing the refrigerant from soaking into the oil in compressor.

Crankcase heater ON: 30 minutes elapsed since installed compressors stopped

(However, ON when power turned on)

*It doesn't control according to the temperature.

If the calculated result is lower than 5 , the judgment temperature is defined as 5
If the calculated result is higher than 12 , the judgment temperature is defined as 12

OFF: Compressor starts

Outdoor temperature <2 and Compressor stop count exceed 20 times at less than 10 minutes of accumulated
heating operation time

Defrost Operation Start Condition 1

Defrost Operation Start Condition 2

Defrost Operation End Condition

2-6 PROTECTIVE FUNCTION

02-11

2-6-1 Protective Function List

Protective Function

Detect Parts

Operating Condition

Operation

Discharge Temp
Protection 1

Discharge Temp
Thermistor

Discharge Temp
Protection 2

Discharge Temp
Thermistor

High Pressure
Protection 1

High Pressure
Sensor

High Pressure
Protection 4

High Pressure
Sensor

COOL HEAT

<Starting conditions>
3 minutes have elapsed since the start of operation and
(discharge temperature 100°C or suction SH 10°C accumulated time
30 minutes)

<Reset conditions>
Discharge temperature 95°C and suctionSH 7°C

EEV of operating indoor unit gradually opened

<Starting conditions>
Cooling: Discharge temperature 95°C
Heating: Discharge temperature 102°C

<Reset conditions>
Discharge temperature 90°C
Discharge temperature 97°C

EEV2 + 30pls/30 secs

Discharge Temp
Protection 4

Discharge Temp
Thermistor

< starting condition>
Discharge temperature 105°C

<Pattern reset condition>
Discharge temperature 100°C

Compressor speed -6rps every 30 secs
Speed rise prohibited,
when discharge temperature becomes lower
than 105 , prohibit the rotational speed rise
of the compressor.

Discharge Temp
Protection 5

Discharge Temp
Thermistor

<Starting conditions>
Discharge temperature 95°C and EEV1=500pls

<Reset conditions>
2 minutes have elapsed and
(discharge temperature 90°C or EEV1 400pls)

Expansion valve of stopped indoor unit gradually
opened
(upper limit 200pls)

Discharge Temp
Protection Stop

Discharge Temp
Thermistor

<Pattern starting condition>
Discharge temperature fixed value (115°C)

<Pattern reset condition>
3 minutes have elapsed and discharge temperature 80°C

Compressor stopped

<Pattern starting condition>
Pattern generated 2 times within 40 minutes

<Pattern reset condition>
Error reset (push button SW) executed after power turned on again

Compressor stopped
(permanent stop)
Error display

<Starting conditions>
COMP < 25 rps ---- HP 3.3 MPa
25 rps COMP < 30 rps ---- HP 3.5 MPa
30 rps COMP

<Reset conditions>
Fixed time has elapsed and Fixed time when SV2: ON 30 secs
COMP < 25 rps ---- HP 3.0 MPa
25 rps COMP < 30 rps ---- HP 3.2 MPa
30 rps COMP

SV2 ON

High Pressure
Protection 2

High Pressure
Sensor

<Starting conditions>
COMP 25 rps ---- HP 3.5 MPa
COMP < 25 rps ---- HP 3.3 MPa

<Reset conditions>
3 minutes have elapsed and high-pressure 2.80MPa

SV2 ON

High Pressure
Protection 3

High Pressure
Sensor

<Starting conditions>
Fixed time has elapsed and high-pressure 3.50MPa
(* Fixed time at start of operation: 10 secs, after operation execution: 20 secs)

<Reset conditions>
Operation (fan speed 1 step increase) complete

Fan speed 1 step increase

<Pattern starting condition>
High-pressure 3.30MPa

<Pattern starting condition>
High-pressure 3.50MPa

<Pattern reset condition>
High-pressure 3.2MPa

<Pattern reset condition>
High-pressure 3.5MPa

Fan speed lowered/every 30 secs

Fan lowest speed
Upper 270 rpm
Lower 250 rpm

DISPLAY

P1

EA11

High Pressure
Protection 5

High Pressure
Sensor

Abnormal High
Pressure Protection
Control

High Pressure
Sensor

<Starting conditions>
High-pressure 3.20MPa

Compressor capacity lowered/every 15 secs

<Pattern starting condition>
COMP < 30 rps ---- HP 3.18 MPa
COMP 30 rps ---- HP 3.68 MPa

<Pattern reset condition>
After 25 seconds have elapsed and,
COMP < 30 rps ---- HP 3.1 MPa
COMP 30 rps ---- HP 3.6 MPa

Compressor capacity rise prohibited

<Reset conditions>
High-pressure 3.20MPa

<Pattern starting condition>
COMP 30 rps ---- HP 3.3 MPa
COMP 30 rps ---- HP 3.8 MPa

<Pattern reset condition>
After 25 seconds have elapsed and,
COMP 30 rps ---- HP 3.18 MPa
COMP 30 rps ---- HP 3.68 MPa

Compressor capacity lowered every 30 secs

---- HP 3.8 MPa

---- HP 3.5 MPa

02-12

Protective Function

Detect Parts

Operating Condition

Operation

Low Pressure
Protection 4

Low Pressure
Sensor

COOL HEAT

High Pressure
Protection Stop 1

High Pressure
Sensor

<Pattern starting condition>
High-pressure 4.00MPa

<Pattern reset condition>
5 minutes have elapsed and high-pressure 3.50MPa

Compressor stopped

<Pattern starting condition>
Pattern generated 3 times within 60 minutes.

<Pattern reset condition>
10 minutes have elapsed and high-pressure 3.50MPa

Pressure Switch

<Pattern starting condition>
Pressure SW operated (Operated by high-pressure 4.20MPa)

<Pattern reset condition>
5 minutes have elapsed and pressure SW operation reset
(Reset by high-pressure 3.2MPa)

Compressor stopped

High Pressure
Protection Stop 2

<Pattern starting condition>
Pattern generated 3 times within 60 minutes.

<Pattern reset condition>
10 minutes have elapsed and pressure SW operation reset
(Reset by high-pressure 3.2MPa)

Compressor stopped
Error display

<Starting conditions>
Low-pressure 0.20MPa

<Reset conditions>
5 minutes have elapsed and low-pressure 0.30MPa

SV2 ON

Low Pressure
Protection 1

Low Pressure
Sensor

<Starting conditions>
Low-pressure 0.10MPa

<Reset conditions>
3 minutes have elapsed and low-pressure 0.17MPa

SV2 ON

<Starting conditions>
3 minutes have elapsed and low-pressure 0.18MPa

<Reset conditions>
3 minutes have elapsed and low-pressure 0.22MPa

EEV of stopped indoor unit opened quickly
(450pls)

Abnormal Low
Pressure Protection
Control

Low Pressure
Sensor

<starting condition>
Low-pressure 0.16MPa

Compressor capacity lowered every 180 secs,

Low Pressure
Protection Stop

Low Pressure
Sensor

<Pattern starting condition>
Low-pressure 0.05MPa or low-pressure 0.10MPa continues for 10 mins

<Pattern reset condition>
3 minutes have elapsed and low-pressure 0.17MPa

<Pattern starting condition>
Pattern generated 5 times within 180 minutes.

<Pattern reset condition>
Error reset (push button SW) executed after power turned on again.

Compressor stopped
(permanent stop)
Error display

Low Pressure
Sensor

Low Pressure
Protection 2

<reset condition>

3 minutes have elapsed and
low-pressure 0.18MPa

Compressor stopped

DISPLAY

Compressor Temp
Protection Stop

Compressor
Temp
Thermistor

<Pattern starting condition>
Compressor temperature fixed value (110°C)

<Pattern reset condition>
3 minutes have elapsed and discharge temperature 80°C

Compressor stopped

Compressor stopped
(permanent stop)
Error display

<Pattern starting condition>
Pattern generated 2 times within 40 minutes

<Pattern reset condition>
Error reset (push button SW) executed after power turned on again

P2

EA41

EA31

EA42

P4

P3

EA51

when the Low-pressure becomes more than

0.17MPa, prohibit compressor capacity rise.

P2

Compressor stopped

02-13

Protective Function

Detect Parts

Operating Condition

Operation

Overcurrent Break
Stop
(Compressor)

Overcurrent
Protection Circuit

COOL HEAT

Compressor stopped

Heatsink Temp
Thermistor

<Pattern starting condition>
Heat sink temperature 100°C

<Pattern reset condition>
3 minutes have elapsed and heat sink temperature 85°C

Compressor stopped

Heatsink Temp
Protection Stop

<Pattern starting condition>
Pattern generated 3 times within 60 minutes.

<Pattern reset condition>
10 minutes have elapsed and heat sink temperature 85°C

Compressor stopped
Error display

<Pattern starting condition>
Current value Cooling: 22.5A / Heating: 23.5A

<Pattern reset condition>
Current value Cooling: 22.5A / Heating: 23.5A

Frequency Maximum
Setting Protection
(Compressor)

<Pattern starting condition>
Current value Cooling: 23.0A / Heating: 24.0A

<Pattern reset condition>
Current value Cooling: 23.0A / Heating: 24.0A

Current Detector
Circuit

Compressor is stopped when the over currernt protectioncircuit in the
inverter PCBoad detects an abnormal current duringthe operation.
If it repeated 5 times, the compressor becomes permanentstop.

Compressor is stopped when the over current protection circuit in the
inverter PC Board detects an abnormal current at the time of start up.
Compressor becomes permanent stop if it repeated over the number
of set time.

<Reset condition>
Error reset (push button SW) executed after power turned on again.

Compressor speed lowered

Compressor speed rise prohibited

• Pattern and start current value changed by outside
temperature

DISPLAY

E941

E931

(permanent stop)

(permanent stop)

EAC4

3. INDOOR UNIT OPERATION

3-1 FAN CONTROL

03-01

3-1-1 Fan Speed Setting

3. INDOOR UNIT OPERATION

AUTO

HIGH MED LOW

Press the FAN CONTROL button to set the fan speed.

Fan speed setting

3-1-2 "AUTO" Position

Fan speed zone

Hi zone

Med zone

Low zone

When the room
temperature decreases

When the room
temperature increases

3. DRY OPERATION

1. COOLING OPERATION

2. HEAT OPERATION

• Expansion

• valve

• Indoor fan
motor

ON
OFF

OPEN
CLOSE

ON

ON

ON

ON ON ON

ON

ON

30s

30s

5s

3min

5s

2min30s

The indoor fan always rotates at "Lo" speed.

TIME -->

2

TR-TS

1

2

TR-TS

1

TR-TS

2

TR-TS

2

3

TR-TS

3

TR-TS

(1) When the TS is changed.
(2) When the operation mode is changed from other mode to "COOL".
(3) When the fan control is changed from other position to "AUTO".

The fan speed is determined automatically in accordance
with the condition "(TR(corrected room temperature) - TS
(corrected set temperature)" as shown on the right.
However, the fan speed zone is determined in the manner
as the room temperature increases for the following cases.

Same as Cooling operation, fan speed is decided by the
difference between the room temperature and the set
temperature.

(1) The indoor fan starts operation 5 seconds after the electric expansion valve opens. However, when the indoor unit just
starts its operation or the operation mode is changed from other to "DRY" and the refrigerant circulation is not stopped,
the fan will rotate immediately without a delay time of 5 seconds.
(2) The indoor fan will stop in 30 seconds when the refrigerant circulation stops.
(3) The indoor fan will stop immediately when the indoor unit is stopped by pushing the stop button or by a setting of ON timer.
(4) When the refrigerant circulation is stopped due to a lower room temperature for more then 3 minutes, the fan will rotate
2 minutes at intervals of 3 minutes.
(5) When the indoor unit just starts its operation or the operation mode is changed from other to "DRY" and the refrigerant
circulation is stopped, the fan will rotate for 1 minute and then it will operate according to the statement (4).

2min

Fan speed zone

Low zone

Med zone

Hi zone

When the room
temperature decreases

When the room
temperature increases

-2

TR-TS

-2

-3

TR-TS

-3

TR-TS

-2

TR-TS

-1

-2

TR-TS

-1

TR-TS

3-2 MASTER CONTROL

03-02

3-2-1 Operation Mode Control

(2) Cool, Dry and Heat Mode

Indoor fan motor

Operates according to

the AIR FLOW-MODE

setting.

See the fan control

page.

Cool Dry

Drain pump

Turns ON-OFF by the drain pump control function

Electrical
expansion valve

Pulse controlled by

the temperature differ-

ence calculation and

frost prevent fuction

Each operation mode is controlled as below.
(1) Stop mode

Indoor fan motor : OFF
Electric expansion valve
Drain pump

: Stop pulse
: Turns ON-OFF by the drain pump control function

Operates according to

the AIR FLOW-MODE

setting, and besides

cold air prevention

operation

Pulse controlled by

the temperature dif-

ference calculation

and frost prevent

function

Heat

Pulse controlled by

the temperature dif-

ference.

(3) Priority mode

The purpose of the priority mode is to restrict operation commands (heating, cooling, dry) from the
connected indoor units. There are 3 priority modes of Neutral, Cooling Priority, and Heating Priority.
The operation modes restricted by each of these modes are as follows:

Priority mode

Neutral

Cooling priority

Heating priority

Restricted operation mode

No restrictions

Heating

Cooling, dry

Neutral

Cooling priority

Heating priority

Cooling priority

Heating priority

1. Priority mode decision methods
Method 1. (Default value)
The initial priority mode is made Neutral and is shifted to Cooling Priority when cooling and to Heating
Priority when heating depending on which operation mode (cooling, heating) was input first.
After shifting to Cooling Priority or Heating Priority, the priority mode shifts to Neutral only when there
was a Stop input from all the indoor units.

Method 2. (Management by outdoor unit)
Operation mode management is made "Management by outdoor unit" by outdoor unit PUSH-SW
(field setting).
The priority mode shifts to Cooling Priority or Heating Priority in accordance with input from the outdoor
unit regardless of the current mode.

03-03

Cooling priority

Heating priority

Method 3. (Management by indoor unit)
Operation mode management is made "Management by indoor unit" by outdoor unit PUSH-SW
(field setting).
Then the master indoor unit is set by wired remote controller.
Thereupon the priority mode shifts to Cooling Priority or Heating Priority in accordance with input
from the master indoor unit regardless of the current priority mode.
The priority mode is fixed at either cooling or heating even if the master indoor unit stops
Cooling/heating switching can be performed by the master indoor unit only.

(4) Opposite operation mode
When the operation mode commanded from an indoor unit (remote controller) and the operation mode
allowed by the system (cooling and dry operation for cooling only type and operation mode allowed by
priority mode for heat pump type) do not match, it is indicated by blinking of an LED.

Timer lamp: 3 secs ON/1 sec OFF repeated

03-04

3-2-2 Auto Changeover

Operation flow chart

START

Room temp.

Room temp.

Ts+2°C ?

COOLING OPERATION

HEATING OPERATION

YES

YES

NO

NO

NO

NO

YES

YES

AUTO CHANGEOVER operation

TS : Setting temperature

Ts- 2°C ?

[Method]

1. Switch operation mode management to "Management by indoor unit" by outdoor unit DIP-SW.

2. Set the master indoor unit by wired remote controller.

3. Judge cooling/heating by the difference between the master indoor unit's setting temperature and
the room temperature.

Thermostat remains

in OFF state for 6 minutes or

longer?

System stops

or operation command other than

auto changeover operation?

NO

NO

Thermostat remains

in OFF state for 6 minutes or

longer?

System stops

or operation command other than

auto changeover operation?

YES

YES

03-05

3-2-3 "COOL" Position

An example for COOLING TEMPERATURE CONTROL time chart (Manual setting)

When using the cooling mode, set the temperature to a value lower than the current room temperature, otherwise

the indoor unit will not start the cooling operation and only the fan will rotate.

• Indoor fan

Ts

• Opening of
EEV

100%
0%

• Refrigerant
flow

ON
OFF

ON
OFF

• Temperature

Ts + 0.5 C

TR

3Min.

Ts : Corrected setting temperature

TR : Corrected room temperature

: The thres hold temperature of start of refrigrant flow

: The thres hold temperature of stop of refrigrant flow

Ts - 0.5 C

Ts + 0.5 C

Ts - 0.5 C

Ts + 0.5 C
Ts - 0.5 C

: The thres hold temperature of start of refrigrant flow

: The thres hold temperature of stop of refrigrant flow

Ts + 0.5 C
Ts - 0.5 C

3-2-4 "HEAT" Position

(1) When using the heating mode, set the temperature to a value higher than the current room temperature, otherwise

the indoor unit will not start the heating operation.

(3)

An example for HEATING TEMPERATURE CONTROL time chart (Manual setting)

During defrosting, the OPERATION indicator lamp flashes 6 sec. ON and 2 sec. OFF, and repeat. The heating operation
will be temporarily interrupted.

• Indoor fan

Ts

• Opening of
EEV

100%
0%

• Refrigerant
flow

ON
OFF

ON
OFF

• Temperature

TR

4Min.

1Min.

4Min.

1Min.

4Min.

1Min.

Ts : Corrected setting temperature
TR : Corrected room temperature

: Duration of cold air prevention

(2) After the start of heating operation, the fan of indoor unit will not rotate until the heater exchange is warmed up to
blow out warm air.

3-3 LOUVER CONTROL

03-06

Instructions relating to heating ( ) are applicable only to heat pump type
outdoor unit.

Begin air conditioner operation before performing this procedure.

Vertical Air Direction Adjustment

This instructions are applicable to "LARGE CEILING TYPE",
"UNIVERSAL FLOOR/CEILING TYPE", "CASSETTE TYPE",
"WALL MOUNTED TYPE" and "COMPACT WALL MOUNTED TYPE".

Press the VERTICAL AIR FLOW DIRECTION SET button.

LARGE CEILING TYPE

UNIVERSAL FLOOR/CEILING TYPE

Example : When set to vertical air direction.

DANGER!

(1) ADJUSTING THE DIRECTION OF AIR CIRCULATION

WALL MOUNTED TYPE

1

2

3

4

1

2

3

4

1

2

3

4

3

4

2

1

Never place fingers or foreign objects inside the
outlet ports, since the internal fan opertes at
high speed and could cause personal injury.

Always use the remote control umit's
AIR FLOW DIRECTION button to adjust
the UP/DOWN air direction flaps or
RIGHT/LEFT air direction louvers. At­tempting to move them manually
could result in improper operation; in
this case, stop operation and restart.
The louvers should begin to operate
properly again.
When used in a room with infants, chil­dren, elderly or sick persons, the air
direction and room temperature
should be considered carefully when
making settings.

COMPACT WALL MOUNTED TYPE

CASSETTE TYPE

1

3

4

2

1

2

3

4

Press the VERTICAL AIRFLOW DIRECTION button.
The temperature display will change to the vertical airflow direction setting display.

Use the air direction adjustments within the ranges shown above.

The vertical airflow direction is set automatically as shown,
in accordance with the type of operation selected.

During Cooling mode : Horizontal flow
During Heating mode : Downward flow

During AUTO mode operation, for the first minute after beginning operation,
airflow will be horizontal ,
the air direction cannot be adjusted during this period.

1

4

1

Cooling & Dry : 1 , 2 , 3 , 4

Heating : 1 , 2 , 3 , 4

Press the VERTICAL AIRFLOW DIRECTION button to change the vertical louvre position.
The position number will appear on the display.

Horizontal Air Direction Adjustment

This instructions are applicable to "LARGE CEILING TYPE",
"UNIVERSAL FLOOR/CEILING TYPE" and "WALL MOUNTED TYPE".

Press the HORIZONTAL AIR FLOW DIRECTION SET button.

LARGE CEILING TYPE

UNIVERSAL FLOOR/CEILING TYPE

WALL MOUNTED TYPE

Example : When set to horizontal air direction.

(2) SWING OPERATION

Instructions are applicable to "LARGE CEILING TYPE", "UNIVERSAL FLOOR / CEILING TYPE", "CASSETTE TYPE",
"WALL MOUNTED TYPE" and "COMPACT WALL MOUNTED TYPE".

Begin air conditioner operation before performing this procedure.

To select Vertical airflow SWING Operation

This instructions are applicable to "LARGE CEILING TYPE", "UNIVERSAL FLOOR/CEILING TYPE",
"CASSETTE TYPE", "WALL MOUNTED TYPE" and "COMPACT WALL MOUNTED TYPE".

1

3

4

5

2

03-07

1

2

3

4

5

Press the VERTICAL SWING button for more than two seconds.

The remote controller's Vertical Swing Display will light up.
In this mode, the UP/DOWN air direction flaps will swing automat­ically to direct the air flow both up and down.

Example : When set to vertical swing.

1

3

4

5

2

Press the HORIZONTAL AIRFLOW DIRECTION button. The temperature
display will change to the horizontal airflow direction setting display.

Press the HORIZONTAL AIRFLOW DIRECTION button to change the
horizontal louvre position. The position number will appear on the display.

Cooling & Dry : 1 , 2 , 3 , 4 , 5

Heating : 1 , 2 , 3 , 4 , 5

To Stop Vertical airflow SWING Operation

Press the VERTICAL SWING button for more than two seconds
once and again.

The remote controller's Vertical Swing Display will go out.
Airflow direction will return to the setting before swing was begun.

Instructions are applicable to "LARGE CEILING TYPE",
"UNIVERSAL FLOOR / CEILING TYPE", "CASSETTE TYPE",
"WALL MOUNTED TYPE", and "COMPACT WALL MOUNTED TYPE".

About Vertical Airflow SWING Operation

About Horizontal Airflow Swing Operation

Air flow direction set

Range of swing

Air swing range

To select Horizontal Airflow SWING Operation

This instructions are applicable to "LARGE CEILING TYPE",
"UNIVERSAL FLOOR / CEILING TYPE", "WALL MOUNTED TYPE".

Press the HORIZONTAL SWING button for more than two seconds.

The remote controller's Horizontal Swing Display will light up.
In this mode, the RIGHT/LEFT air direction louvers will swing
automatically to direct the airflow both right and left.

To stop Horizontal airflow SWING Operation

Press the HORIZONTAL SWING button for more than two seconds
once and again.

The remote controller's Horizontal Swing Display will go out.
Airflow direction will return to the setting before swing was begun.

Example : When set to horizontal swing.

Range of swing

03-08

The SWING operation may stop temporarily when the
air conditioner's fan is not operating, or when operating
at very low speeds.

The swing operation is not available depending on the model.
Please refer to the operating manual for the indoor unit.

The SWING operation may stop temporarily when the
air conditioner's fan is not operating, or when operating
at very low speeds.

The swing operation is not available depending on the model.
Please refer to the operating manual for the indoor unit.

Left and right swing range can be changed in 3 steps by field setting.

( Factory setting)

Function Number

Setting Value

24

00
01
02

Left and right swing range

1 to 5 (All range)

1 to 3
3 to 5

1 to 4
(All range)

1
2
3
4

3-4 ELECTRONIC EXPANSION VALVE CONTROL

03-09

3-5 DRAIN PUMP OPERATION

1. Initialization

2. Operation Control

When starting up

Automatic operatic control

Automatic PI control is performed based on the indoor unit heat exchanger outlet temp and inlet temp.

Room temperature control

The room temperature is controlled so that it reaches to the set-up temperature based on the difference
between the room temperature and the set-up temperature, and the change of indoor unit temperature.
if the room temperature becomes 0.5 C lower than the set-up temperature, EEV is fully closed.

3. Special Control

(1) When cooling and refrigerant circulation starts, the drain pump starts simultaneously.
(2) The drain pump operates continuously for 3 minutes after the refrigerant circulation stopped.
(3) When the refrigent circulation is stopped by a start of indoor heat exchanger frost prevention
operation, the drain pump will turn off in 1 hour after the end of indoor heat exchanger frost
prevention operation.
(4) When the water level in the drain pan rises up and then the float switch functions:

Microcomputer stops the refrigerant circulation and indoor fan motor operation.
Drain pump operates continuously for 3 minutes after the float switch is turned off.

(Almost condensing water may be drained)
(5) When the float switch turns ON continuously for 3 minutes, 'FAILURE INDICATION' operates.
(6) When the float switch turns OFF within 3 minutes, the unit starts cooling operation.

1
2

When the power is turned ON.
When it has passed the limited time since the last initialization.

When indoor unit stopping

Oil recovery operation : Controlled pulse.
Test run operation : Controlled pulse.
Icing protection control : Fully closed.
Pump down operation : Fully open.
Defrost operation : Controlled pulse

Outdoor unit Condition

EEV Condition

Cooling

Heating

Fully closed

Slightly open

(Cooling) Move to the cooling control base pulse in steps.
(Heating) Move to the heating control base pulse in steps.

OFF

Fully closed

3-6 FUNCTION

03-10

3-6-1 Auto Restart

The air conditioner restarts with the previous setting operation.

3-6-2 Icing Protection Control

3-6-3 Oil Recovery Operation

[Oil recovery operation] : It periodically returns the residual refrigerant ion oil in the indoor unit and the connection
piping back to the outdoor unit , and prevents the compressor oil level from decreasing.

6 sec ON 2 sec OFF Blinking

Indoor unit LED : Operation LED

Indoor fan : Same operation before oil recovery operation.

Indoor EEV : Control pulse

During the above operation, a refrigerant noise may be from the indoor unit.

The icing of the indoor heat exchanger is prevented during the cooling and dry mode operation.

(1) Starting Condition
Compressor is operation more than 3 minutes.
When "Heat exchanger inlet temperature TA" continues *4 minutes or more.
Compressor is operation more than 3 minutes.
When "Heat exchanger outlet temperature TA" continues 4 minutes or more.

(2) Operation
EEV is closed.
Fan is at the setting amount.

(3) Completing Condition
Heat exchanger inlet and middle temperature TB
After more than 5 minutes

*

Drain pump turns off at 60 minutes past the completion of the icing protection operation.

TA

TB

1°C

7°C

3-7 TIMER CONTROL

03-11

3-7-1 Wireless Remote Controller

There are following 4 kinds of timer modes are available.

ON Timer
OFF Timer
PROGRAM Timer
SLEEP Timer

1. ON / OFF TIMER

3. SLEEP TIMER

2. PROGRAM TIMER

To set the PROGRAM timer

1

2

3

4 5

Select "OFF TIMER" Adjust the OFF time. Select "ON TIMER"

Adjust the ON time.

(About 5 seconds later, the entire display.
will reappear.)

Select "PROGRAM TIMER"

(Either OFF ON or OFF ON
will display.)
(If the ON timer has been se­ lected to operate first, the unit
will stop operating at this point.)

Select "CANCEL".

The air conditioner will return to normal op­eration.

To cancel the TIMER

*To change operating conditions

If you wish to change the operating conditions (ON/OFF,Mode,
Fan Speed, Temperature Setting), after making the time set­ting, wait until the entire display reappears, then press the ap­propriate buttons to change to the desired operating condition.

Press the START/ STOP button to start the air conditioner, and then proceed as follows.

The timer functions cannot be used when this controller is used together with the remote controller (Wired type).
A beeping sound is made when a signal is received.

To set the ON / OFF timer

1

2

Adjust the OFF or ON time.

(About 5 seconds later, the
entire display will reappear.)

Press the TIMER MODE button to select
"OFF TIMER" or "ON TIMER"

CANCEL OFF TIMER ON TIMER

PROGRAM TIMER (OFF ON, OFF ON)

Press the START/ STOP button to start the air conditioner, and then proceed as follows.

To set the SLEEP timer

(Both the indoor unit's OPERATION indi­ cator lamp (green) and the TIMER indi­ cator lamp (orange) will light.)

Select "CANCEL".

The air conditioner will re­turn to normal operation.

Adjust the OFF time.

(About 5 seconds later,the
entire display will reappear.)

1

2

To change the timer settings

1 2

*To cancel the TIMER

Press the SLEEP button
once again.

Set the time using the
TIMER SET buttons.

Unlike other timer functions, the SLEEP timer is designed to set the duration of time in which the unit does not operate.
The SLEEP timer can be set regardless of whether the indoor unit is operating or stopped.

* Even ON/OFF and Sleep timer are valid.

* Even ON/OFF and Program timer are valid.

UTY - LNH

*To stop air conditioner
operation during
timer operating

03-12

Sleep timer

The sleep timer function automatically corrects the temperature thermostat setting according to
the time setting to prevent excessive cooling and heating while sieeping.

Cooling operation / dry operation Heating operation

When the sleep timer is set, the set temperature
automatically rises 1°C every hour.The set
temperature can rise up to a maximum of 2°C

Timer setting

60min.

1°C

2°C

When the sleep timer is set, the set temperature
sutomatically drops 1°C every 30 minutes. The
set temperature can drop to a maximum of 4°C

1 C

2 C

3 C

4 C

30min.

60min.

90min.

Timer setting

03-13

2

1

3

4

3-7-2 Group Remote Controller

UTY - CGG

WEEKLY TIMER

Different schedules can be set for each day of the week.
Four timers can be set for each day.
Operation on/off time, operation mode, and temperature can be specified for each timer.

1. WEEKLY TIMER

The timer function is not available depending on the initial setting.

Note: When a time is not set, the weekly timer cannot be started.

Different schedules can be set for each day of the week.

Four timers can be set for each day

Press the ALL TIMER button to start or cancel the WEEKLY timers for all indoor units.

If any of the indoor units are in the timer mode, pressing this
button cancels the timers for all indoor units.
If none of the indoor units are in the timer mode, pressing
this button starts the timers for all indoor units.

Press the Select button to select the indoor unit.

Press the PROGRAM (CLOCK AD­JUST) button.

* Do not press this button for two sec­ onds or more, otherwise you will en­ ter the time setting mode.

Press the Select button to select the indoor unit.

* If all indoor units are selected, the times for all of the registered indoor unit
timers are set at once.



Day of the week setting



S M T W T F S

ALL

All indoor units

SUN MON TUE WED THU FRI SAT

Press the Timer Mode (DELETE) button to start or cancel the WEEKLY timers.

The timer does not start if the time is not set.

Press the DAY button to select the day of the week.

* For ALL, all of the days can be set together when a appears around
each day.

To start / cancel the WEEKLY timer operation

To set the WEEKLY timer

Press the Set Time buttons to set the time in 10-minute increments.
* Hold down a Set Time button to adjust the time quickly.

* The time already set at another timer is skipped at the relevant indoor unit.

Decrement Increment

Timer setting

03-14

7

8

NOTES

To delete the operating time

5

6

Operating setting

Raise

Lower

Press the Start/Stop button or the Mode button or the Set Temperature button to set
the operation.

* For the operations that can be set, refer to "Operation mode setting", "Room tem­ perature setting", and "To start /stop operation" , in "OPERATION".
* Only the current operation settings are displayed.

ex.TIMER-1 will start operation at 8:00 on COOL.

Setting the next timer for the same day:

TIMER-1 TIMER-2 TIMER-3 TIMER-4

Then press the ENTER button to proceed to the time setting, and repeat steps from to .

4 5

Repeat steps to to set the timer for another day of the week.

3 5

Be careful for pressing the ENTER button without any operation setting because the time that is set will be
cancelled.



When the operating time is set, the mark appears.

ex. TIMER-1 will start operation at 8:00 on COOL with a set­ ting of 20 C

1. Press the ENTER button to confirm the set timer.

2. Press again the PROGRAM (CLOCK ADJUST)
button to complete the weekly timer setting.

* flashes for two seconds.



Setting the timer for the other indoor units:

Before setting the timer for other indoor units, press the ENTER button to confirm the
settings.
* The display switches to the next timer.

Repeat steps to to set the timer for other indoor units.

2 6

1. If the Timer Mode (DELETE) button is pressed during steps to , the operat­ ing time for the selected day will be deleted.
* If all the days are selected, the operating times for all of the days of the se­ lected timer will be deleted.

2. Press the ENTER button to confirm the deletion.

3 7

AM

(1) The WEEKLY timer does not operate when the HEAT timer is set if a HEAT PUMP MODEL in the air conditioning system
is operating in the cooling mode. In addition, the WEEKLY timer does not operate when the COOL or DRY timer is set if
a HEAT PUMP MODEL in the air conditioning system is operating in the heating mode.
(2) Even if the timer operation is set, the timer lamp of the indoor unit does not light up. (The timer lamp is used for
wireless remote controller only.)
(3) If the same time is set in Timer-1 to Timer-4 of an indoor unit, the timer setting of the smallest number will be effective.

03-15

3-7-3 Wired Remote Controller

UTY - RNK

ON / OFF TIMER
WEEKLY TIMER
TEMPERATURE SET BACK TIMER

1. ON / OFF TIMER

The timer function is not available depending on the model.

To set the ON/OFF timer

Press the timer mode button to se­lect the ON timer or OFF timer.

It is switched every time as shown
in the below diagram when the
button is pressed.

2

Press the DELETE button to cancel the timer mode.
The timer mode can also be canceled by changing the timer mode using the timer mode button.

1

NON
STOP

OFF
TIMER

ON
TIMER

WEEKLY
TIMER

No display

Press the set time buttons to set the time.
After the time is set, the timer will start automatically.
The amount of time until the OFF timer operates that is
displayed on the timer display decreases as time passes.

From 1 to 24 hours

ex. OFF timer set for 6 hours

To cancel

SUMOTUWETH FR

SA

03-16

2. WEEKLY TIMER

The timer function is not available depending on the model.

Press the timer mode button to select the weekly timer.

2

Press the SET button for 2 sec­onds or more.

1

3

SUMOTUWETH FR

SA

369

12 15 18 21

Day of the week setting

Press the DAY button to select the day of the week, and then press the
TIMER SET button to confirm the setting.

For ALL, all of the days can be set together when a
each day.

appears around

ALL SU MO TU WE TH FR SA

SUMOTUWETH FR

SA

369

12 15 18 21

1

2

Weekly timer setting

4

Time setting (ON / OFF timer)

Press the SET TIME buttons to set the ON time in 30-minute increments, then press the TIMER SET button to proceed to
the OFF time setting. Set the OFF time in the same way.
If necessary, set the second weekly timer settings in the same way.

When the operating time is set, the

mark appears.

6

Press the TIMER SET button
for 2 seconds or more to
complete the weekly timer
settings.

To delete the operating time

If the TIMER DELETE button is pressed during steps or
, the operating time for the selected day will be deleted.
If all the days are selected, the operating times for all of the
days will be deleted.

3

4

ex. The timer is set for 7:00-18:00.

5

Repeat steps and to set
the weekly timer for another
day of the week.

3 4

ON-1 OFF-1 ON-2 OFF-2

Time setting (Independent OFF timer)

1

2

1

Press the TIMER MODE button to change to the independent OFF timer setting.
* The time setting process is the same as the ON/OFF timer.
Press the TIMER MODE button to return to the ON/OFF timer setting.

Switching from ON/OFF timer to independent OFF timer

The independent timer
will flash on the display.

ON-2 OFF-2 OFF-2 OFF-3

03-17

SUMOTUWETH FR

SA

369

12 15 18 21

SUMOTUWETH FR

SA

369

12 15 18 21

To start

When the weekly timer is selected,
the timer starts automatically.

To cancel

Press the TIMER DELETE button to
cancel the timer mode.
The timer mode can also be canceled
by changing the timer mode using
the TIMER MODE button.

1

During the weekly timer,
press the TIMER SET
button for 2 seconds or
more to set the day.

Select the day to set the
DAY OFF.

Press the DAY (DAY OFF)
button for 2 seconds or
more to set the DAY OFF.

Press the TIMER SET
button for 2 seconds or
more to complete the
DAY OFF setting.

2 3 4

To cancel

Follow the same procedures as those
for setup.

ex. The DAY OFF is set for Monday.

NOTES

The DAY OFF setting is only available for days for which weekly settings already exist.
If the operating time carries over to the next day (during a next day setting), the effective DAY OFF range will be set as
shown below.

Normal Next day setting

Setting dayPreceding day Next day Setting dayPreceding day Next day

The DAY OFF setting can only be set one time.
The DAY OFF setting is cancelled automatically after the set day has passed.

Flashing mark:
indicates the DAY OFF.

ON OFF ON OFF

DAY OFF

WEEKLY WEEKLY

WEEKLY

WEEKLY

ON

OFF

ON

OFF

DAY OFF

To start /cancel the WEEKLY timer operation

To set the DAY OFF (for a holiday)

369

12 15 18 21

The operating time for the current
day is displayed.

ex.Operating time 7:00-18:00
Indpnd. OFF time 21:00

The independent timer
will flash on the display.

NOTES

(1) PRECAUTIONS DURING WEEKLY TIMER SETUP
Setup is not possible in the following cases, so amend
the time.
Be sure to set the ON time first, then the OFF time. If
either the ON time or the OFF time is not set cor
rectly, the timer will not operate properly.
The WEEKLY 2 settings cannot be set earlier than the
WEEKLY 1 settings.
The WEEKLY 1 and WEEKLY 2 time spans cannot
overlap.

(2) The earliest OFF time you can set is 30 minutes after the
ON time.
(3) The OFF time can be carried over to the next day.
(4) The earliest independent OFF time you can set is 30 min­ utes after the last OFF time.
(5) An independent OFF time can be set up to 0:00 hours of
the next day.
(6) Even if the timer operation is set, the timer indicator lamp
of the indoor unit does not light up. (The timer indicator
lamp is used for wireless remote controllers only.)

03-18

3. TEMPERATURE SET BACK TIMER

The timer function is not available depending on the model.

Press the SET BACK button to change to the SET BACK con­firmation display.
The SET BACK operating time and the set temperature will
be displayed.

2

Press the SET button for 2
seconds or more.

1

3

Day setting Operating time setting

Follow step and in "To set the WEEKLY timer". The DELETE button is also used as described in the
procedures for the weekly timer.

4

NOTES

The SET BACK timer only changes the set temperature, it cannot be used to start or stop air conditioner operation.
The SET BACK timer can be set to operate up to two times per day but only one temperature setting can be used.
The SET BACK timer can be used together with the ON, OFF, and weekly timer functions.
The SET BACK operating time is displayed only in the SET BACK confirmation display.
(Refer to step 1 for the SET BACK confirmation display. )

During the COOL/DRY mode, the air conditioner will operate at a minimum of 18°C even if the SET BACK temperature
is set to 17°C or lower.
Room temperatures as low as 10, 12, and 14°C cannot be set depending on the model.

SET BACK

SUMOTUWETH FR

SA

369

12 15 18 21

SUMOTUWETH FR

SA

369

12 15 18 21

ex. When setting all days together

Temperature setting

Press the set temperature buttons to set
the temperature. (The temperature setting
range is the same as the range for the
operation mode.)

ex. Operating time 15:00 - 22:00

5

Repeat steps and .
Press the SET button for 2 sec­onds or more to complete the
temperature SET BACK timer
settings.

3 4

ON OFF

24°C

24°C

28°C

SET BACK temperature

Normal temperature

To start

SET BACK

Press the SET BACK button. The SET BACK confirmation display appears
for 5 seconds, and then the timer starts automatically.

ex. Display during SET BACK timer operation
(The operating time will not be displayed.)

To cancel

Press the SET BACK button, and then
press the DELETE button while the
SET BACK confirmation display is dis­played. Even if the SET BACK button
is pressed again, the SET BACK timer
will be cancelled.

SUMOTUWETH FR

SA

369

12 15 18 21

If there is no existing
SET BACK tempera­ture setting, " - - " will
be displayed for the
temperature.

SUMOTUWETH FR

SA

1

3

2

4

1

2

Temperature SET BACK timer setting

To start /cancel the temperature SET BACK timer operation

3 4

4. TROUBLE SHOOTING

Continuous lighting(lowered light)Anti Freeze

Operation LEDTest Operation

Operation LED

Power Failure

Oil Recovery

Operation LED

Defrosting

Timer LED

Timer LED

Timer LED

Continuous lighting(lowered light)Timer LEDTimer

Continuous lighting

Operation LED

Operation

Flashing PatternIndication LampIndication type

04-01

Opposite Operation Mode

4-1 NORMAL OPERATION

4. TROUBLESHOOTING

4-1-1 Indoor Unit Display

Filter Filter LED Continuous lighting

ON

OFF

ON

OFF

1 sec

1 sec

6 sec 2 sec

ON

OFF

ON

OFF

Operation LED

Timer LED

Filter LED

Maintenance Mode

1 sec 1 sec

1 sec

1 sec

3 sec 1 sec

ON

OFF

1 sec 1 sec

ON

OFF

LED101

Inverter Compressor Operation Indication

Low Noise Mode

System stopped with compressor Temperature
Protection

System stopped with Low Pressure
Protection

System stopped with High Pressure
Protection

System stooped with Discharge Temp.
Protection

Defrost Operation

Oil Recovery Operation

Heating Mode

Cooling Mode

Idling(stop)

Indication type 7 Segment LED Pattern

4-1-2 OUTDOOR UNIT DISPLAY

LED104

LED105

POWER

MODE

ERROR

(GREEN)

LED102

(RED)

Blank

"C" OO "L"

"H" EA "T"

"O" IL "R" ECOVERY

"D" E "F" ROST

"P" ROTECT "1"

"P" ROTECT "2"

"P" ROTECT "3"

"P" eak "C" ut

"L" OW "N" OISE

Blinking

Description

POWER
LED101

ERROR
LED102

ON

ON

OFF

OFF

"P" ROTECT "4"

ON

OFF

1 sec 1 sec

Peak Cut Mode

<Starting condition>
Discharge temp fixed value: 115°C
<Release condition>
3 minutes have elapsed and discharge temperature 80°C

<Starting condition>
Compressor temp fixed value :110°C
<Release condition>
3 minutes have elapsed and discharge temperature 80°C

<Starting condition>
Low pressure 0.05MPa
or low pressure 0.10MPa continues for 10 minutes
<Release condition>
3 minutes have elapsed and low pressure 0.17MPa

<Starting condition>
High pressure 4.00MPa
<Release condition>
5 minutes have elapsed and high pressure 3.50MPa

Refer to 02-10 page for operation.

Refer to 02-11 page for operation.

Refer to 02-08 page for operation.

04-02

Water Drain Abnormal

Outdoor Unit Error

Indoor Unit Fan Motor Error

Indoor Unit Heat Ex. Sensor Error

Room Temperature Sensor Error

Indoor Unit Parallel
Communication Error

Indoor Unit Main PCB Error

Indoor Unit Power
Frequency Abnormal

Network Communication Error

Remote Controller
Communication Error

Error Contents

12 ~ 48

7

Continuous flash

8

Continuous flash

9 times flash

5,6

Continuous flash1 times flash

5 times flash

Continuous flash2 times flash

5 times flash

4

Continuous flash1 times flash

4 times flash

1,3

Continuous flash

6 times flash

4 times flash

2

3 times flash

1 times flash

Continuous flash 2 times flash3 times flash

10

Continuous flash1 times flash3 times flash

Continuous flash

4 times flash

1 times flash

11

Continuous flash2 times flash1 times flash

9

Trouble
shooting

Filter LEDTimer LEDOperation LED

Depending on contents of Outdoor unit, it may not indicate. (Refer to "TROUBLE LEVEL OF SYSTEM")

Error Indication Flashing Pattern

Please refer the flashing pattern as follows.

04-03

4-2 ABNORMAL OPERATION

4-2-1 Indoor Unit Display

0.1s / 0.1s

4.0s

1.0s

0.5s 0.5s

0.5s 0.5s 0.5s 0.5s

1.0s

0.5s 0.5s

0.5s 0.5s

3.0s

1.0s

4.0s

1 cycle

ON

ON

ON

OFF

OFF

OFF

Operation LED

Timer LED

Filter LED

Example : Indoor Unit Main PCB Error (Operation LED : 3 times, Timer LED : 2 times)

15 times flash

4-2-2 Outdoor Unit Display

LED101

POWER
LED101

ERROR
LED102

MODE

EXIT

SELECT

ENTER

SW107

SW108 SW109

POWER

MODE

ERROR

(GREEN)

LED102

(RED)

0.1sec 0.1sec

ON

ON

OFF

OFF

POWER MODE LED : on
ERROR LED : blink

ERROR transition

"Err." and quantity are alternately shown.

When there is more than one error, display is changed by "SELECT" short press.

When more than one indoor unit is abnormal, display is changed by "SELECT" short press.

"ENTER" short press"ENTER" short press

"ENTER" short press"ENTER" long press

*

Short press : less than 3 seconds
Long press : more than 3 seconds

Annunciation

Type of errors

Address

"SELECT" short press
display change

"SELECT" short press
display change

If some error is newly occured or resolved
during transition, it is reflected after going
back to "Annunciation".

* Only in the case of "indoor unit abnormal
(E.5U.1)", indoor unit address is shown by
ENTER long press.

LED display

Operation button

ex : discharge thermistor 1 abnormal ex : indoor unit abnormal

04-04

Trouble

shooting

Error Contents

4-2-3 Error Code List for Outdoor Unit

Error

Code

Auto Address Setting Error

Indoor Unit Error

Initial Setting Error

Inverter PCB short intereuption detection

Inverter Error

Inverter Communication Error

Outdoor Unit EEPROM Access Error

EEPROM Data corrupted Error

Outdoor Unit transmission PCB
Parallel Communication Error

20

19

18

16

15

17

Signal Amplifier Auto Address Setting Error

Trouble

shooting

Error Contents

High Pressure Switch Error

Suction Pressure Sensor Error

Current Sensor Error

SC HE. Liquid Outlet Temp Sensor Error < TH7 >

SC HE. Gas Outlet Temp. Sensor Error < TH9 >

SC HE. Gas Inlet Temp. Sensor Error < TH8 >

Discharge Pressure Sensor Error

Heat Sink Temp. Sensor Error < IPM built in >

Suction Gas Temp. Sensor Error < TH4 >

Outdoor Temp. Sensor Error < TH3 >

Heat Ex. Liquid pipe Temp. Sensor Error < TH5 >

33

32

31

30

29

28

27

26

25

24

23

21

- - - -

2 8 . 1

5 U . 1

6 2 . 8

6 2 . 3

6 2 . 6

6 3 . 1

6 7 . 2

6 9 . 1

2 8 . 4

7 2 . 1

7 3 . 3

7 4 . 1

7 5 . 1

7 7 . 1

8 2 . 1

8 2 . 2

8 3 . 2

8 4 . 1

8 6 . 1

8 6 . 3

8 6 . 4

7 1 . 1

Compressor Temp. Sensor Error < TH10 >

Discharge Temp. Sensor Error < TH1 >

22

Outdoor unit FAN motor under voltage
(Lack of DC Voltage)

Outdoor Unit Fan Motor Lock Error
(Start up Error)

Compressor Motor Loss of Synchronization

Trip Detection

Inverter Compressor Start Up Error

Outdoor Unit Fan Motor 1 Temperature Abnormal 39

38

37

36

35

34

Error

Code

9 3 . 1

9 4 . 1

9 5 . 5

9 7 . 1

9 7 . 4

9 7 . 5

A 1 . 1

A 3 . 1

A 4 . 1

A 4 . 2

A 5 . 1 Low Pressure Abnormal

High Pressure Protection 1

High Pressure Abnormal

Compressor Temperature Abnormal

Discharge Temperature Abnormal

45

44

43

42

41

12

1 - 11

04-05

46

47

48

1 4 . 5

The number of Indoor unit shortage

Outdoor Unit Fan Motor 2 Temperature Abnormal 39

379 8 . 1

9 8 . 5

Coil ( Expansion Valve 1 ) Error 409 A . 1

Coil ( Expansion Valve 2 ) Error 409 A . 2

14

1 4 . 2

Outdoor unit Network communication abnormal 2

Outdoor Unit Fan Motor Lock Error
(Start up Error)

4-2-4 Remote Controller Display

04-06

<< WIRED REMOTE CONTROLLER >>

If an error occurs, the following display will be shown.
(“ “ will appear in the set room temperature display.)
If “

“ is displayed, immediately contact authorized

service personnel.

Unit number (usually 0) Error code

Ex. Error code display

ERROR CODE DISPLAY

<< SIMPLE REMOTE CONTROLLER >>

Error code

Ex. Error code display

Faulty unit No.
(Remote controller address)

ERROR CODE DISPLAY

<< GROUP REMOTE CONTROLLER >>

The air conditioning system must be inspected if “ : “
(error code) appears on the timer and Clock Display, or the

operation lamp is flashing.

Model code

Error code

Ex. Error code display

ERROR CODE DISPLAY

Model code

: Outdoor unit
: Indoor unit
: Group remote controller
: Convertor

*1 ;

*1

If an error occurs, the following display will be shown.
(“ “ will appear in the set room temperature display.)
If “

“ is displayed, immediately contact authorized

service personnel.

Trouble

shooting

Error Contents

4-2-5 Error Code List for Simple and Wired Remote Controller

Error

Code

Trouble

shooting

Error Contents

Error
Code

1 2

1 4

1 5

1 6

- -

2 6

2 8

3 1

3 2

4 1

4 2

5 1

5 3

Indoor Unit Main PCB Error

Indoor Unit Power Frequency Abnormal

Other Setting Error

Address Setting Error

Initial Setting Error

Indoor Unit Parallel Communication Error

Scan Error

Network Communication Error

Remote Controller
Communication Error

Indoor Unit Fan Motor Error

Indoor Unit Heat Ex. Sensor Error

Room Temperature Sensor Error

Water Drain Abnormal

6 2

6 3

6 7

6 9

Inverter PCB short interruption detection

Inverter Error

Outdoor Unit Main PCB Error

Outdoor Unit transmission PCB Error

8 2

8 3

8 4

8 6

9 3

9 4

9 5

9 7

Current Sensor Error

Liquid Pipe Temperature Sensor Error

Sub-cool Heat Ex. Gas Temperature Sensor Error

Pressure Sensor Error

Outdoor Unit Fan Motor 1 Error

Compressor Motor loss of Synchronization

Trip Detection

Compressor Start Up Error

A 1

A 3

A 4

A 5 Low Pressure Abnormal

High Pressure Abnormal

Compressor Temperature Abnormal

Discharge Temperature Abnormal

7 1

7 2

7 3

7 4

7 5

7 7 Heat Sink Temperature Sensor Error

Suction Gas Temperature Sensor Error

Outdoor Temperature Sensor Error

Heat Ex. liquid pipe Temperature Sensor Error

Compressor Temperature Sensor Error

Discharge Temperature Sensor Error

4-2-6 Error Code List for Group Remote Controller

Trouble

shooting

Error Contents

Error

Code

Trouble

shooting

Error Contents

Error
Code

1 4

1 5

1 6

3 1

3 2

1 2

Remote Controller
Communication Error

Indoor Unit Main PCB Error

Indoor Unit Power Frequency Abnormal

Indoor Unit Parallel Communication Error

Scan Error

Network Communication Error

4 1

4 2

5 1

5 3

9 U

Inddor Unit Fan Motor Error

Indoor Unit Heat Ex. Sensor Error

Room Temperature Sensor Error

Water Drain Abnormal

Outdoor Unit Error

9, 83

11

10

2

1, 3

5, 6

4

8

7

12 48

9,10,72,78

12

11,13,14,81

15 17

10

2

4

1, 3

5, 6

8

7

18

19

20

21

24

22

23

25

26

27,28

29

30

31 33

34

36

35

37 39

41

42

43, 44

45

04-07

84

C 4 PCB Error 77

C A Software Error 68, 75

C 1 PCB Error 1 66, 71

84

79

46, 47

9 8

Outdoor Unit Fan Motor 2 Error

37 39

9 A

Coil ( Expansion Valve ) Error

40

4-2-7 Error Code List for External Switch Controller (UTY-TEKX)

Trouble

shooting

Error Contents

Error
Code

- -

- -

- -

- -

Power Supply Error

Switch Operation Error

Transmission Error

The abnormality in connection
of remote controller cable

55

56

58

04-07

+1

57

4-2-8 Error Code List for Signal Amplifier (UTY-VSGX)

Trouble

shooting

Error Contents

Error
Code

- -

2 6

C 1

- -

Power Supply Error

Parallel Communication Error

Address Setting Error

Communication Error

59

60

62

- -

Communication Error B

63

- -

Communication Error A

64

61

4-2-9 Error Code List for Network Convertor (UTY-VGGX)

Trouble

shooting

Error Contents

Error
Code

C 1

1 2

C A

- -

Power Supply Error

Software Error

Communication Error
with Group Remote Controller

PCB Error 1

65

66

68

2 6

Refrigerant circuit address setting error

69

67

Trouble

shooting

Error Contents

Error
Code

C 1

1 2

1 6

- -

Power Supply Error

Communication Error with Indoor Unit

Communication Error
with Standard Remote Controller

PCB Error 1

70

71

73

2 6

Communication Error with Indoor Unit

74

C A

Software Error

75

5 U

Indoor / Outdoor Unit Error

76

72

1. When connecting a group remote controller to a network convertor

2. When connecting a single split type indoor unit to a network convertor

4-2-10 TROUBLE LEVEL OF SYSTEM

<< System Condition when Outdoor Unit Error is occurred >>

(1)
Not indicated on Indoor Unit.
Not indicated on Peripheral Unit.
Indicated on Service Tool.

(2)
Indicated on Indoor Unit.
Indicated on Peripheral.
Indicated on Service Tool.

>Abnormal
>LED indication
>Outdoor unit does not stop

>Temporary blackout detection
protection
(Inverter compressor stop)

> Discharge temperature abnormal
(Inverter compressor stops)
> Compressor temperature abnormal
(Inverter compressor stops)
> High pressure switch error
(Inverter compressor stops)
> High pressure switch error
(Constant speed compressor stops)
> Discharge Temp sensor error
(Inverter compressor stops)
> Compressor Temp sensor error
(Inverter compressor stop)
> Heat sink Temp sensor error
(Inverter compressor stop)
> Current sensor error
(Inverter compressor stop)
> High pressure switch error
(Inverter compressor stop)
> Inverter error
(Inverter compressor stop)
> Heat sink temperature abnormal
(Inverter compressor stop)
> Inverter compressor start up error
(Inverter compressor stop)
> Trip detection
(Inverter compressor stops)
> Rush current limiting resister Temp
rise protection
(Inverter compressor stop)
> Comp. motor loss of synchronization
(Inverter compressor stop)
> Inverter communication error
(Inverter compressor stop)
> Outdoor unit EEPROM access error
> Outdoor unit EEPROM data corrupted

> Indoor unit number shortage

System Condition

Outdoor unit Condition

System is not
stopped compulsorily

Trouble Level

1 2

(Not available)

04-08

This will not be displayed on indoor unit which Error Report Target(function setting 47 of indoor unit) is set "for administrator".

>Abnormal
>LED indication
>Outdoor unit does not stop

> Suction gas Temp sensor error
> Outdoor Temp sensor error
> Sub-cool heat Ex. gas inlet Temp
sensor error
> Sub-cool heat Ex. gas outlet Temp
sensor error

(1)
Not indicated on Indoor Unit.
Not indicated on Peripheral Unit.
Indicated on Service Tool.

(2)
Indicated on Indoor Unit.
Indicated on Peripheral.
Indicated on Service Tool.

- Discharge temperature abnormal

- Compressor temperature abnormal

- Current sensor error

- Inverter compressor start up error

- Trip detection

- Rush current limiting resister Temp rise protection

- Comp. motor loss of synchronization

- Low pressure abnormal

- Fan motor 1 lock error

- Fan motor 2 lock error

System Condition

Outdoor unit Condition

System is
compulsorily stopped.

Even if power is reset, the following Error cannot release.

<Important>

These errors can not be judged without operating the system, and the serviceman
would not be able to check it if the system power is turned off before visiting the site for repair.
In Error release, you need to operate push switch and apply "Error reset" (F3-40) after power restart.

Trouble Level

1 2

>Abnormal
>LED indication
>Outdoor unit stops
>Need to repair
>secondary accident
is possible.

(Not available) >High pressure abnormal

>Low pressure abnormal
>Fan motor 1 lock error
>Fan motor 2 lock error
>Fan motor 1 temp. abnormal
>Fan motor 2 temp. abnormal
>Heat Ex. liquid Temp sensor error
>Discharge pressure sensor error
>Suction pressure sensor error
>Outdoor unit communication PCB
parallel communication error
>Outdoor unit network
communication 2 error
>Lack of DC Voltage
>Indoor unit number shortage
>SC HE. Liquid Outlet Temp
Sensor Error

04-09

Trouble shooting 1
INDOOR UNIT Error Method:

Model Information Error
(Indoor Unit Main PCB Error)

Indicate or Display:

Indoor Unit : Operation LED 3 times Flash, Timer LED 2 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E.5 U.1

Error Code : 3 2

Detective Actuators:

Indoor Unit Controller PCB Circuit

Detective details:

3 continuous failure of read test of EEPROM at Power ON, or Apparent Model
information error from EEPROM. Also, Error on Model information upon model
information test of EEPROM, or Model information of EEPROM not possible to
recover.

Forecast of Cause : 1. Outside cause 2. Connection failure of electric components 3. Controller PCB defective

Check Point 1-2 :
Check outside cause (Voltage drop or noise, etc.)

Instant drop ----- Check if there is a large load electric apparatus
in the same circuit.

Momentary power failure ----- Check if there is a defective
contact or leak current in the
power supply circuit.

Noise ----- Check if there is any equipment causing harmonic
wave near electric line (Neon bulb or electric
equipment that may cause harmonic wave).
Check the complete insulation of grounding.

Check Point 3 : Replace Controller PCB

Change Controller PCB and set up the original address.

Check Point 1-1 : Reset Power Supply

Check Point 2 :
Check Indoor Unit electric components

YES

NO

Does abnormal LED indication show again?

Check all connectors (loose connector or incorrect wiring)
Check any shortage or corrosion on PCB.

OK

Note : EEPROM

EEPROM(Electronically Erasable and
Programmable Read Only Memory) is a non­volatile memory which keeps memorized
information even if power is turned off. It can
change the contents electronically.
To change the contents, it uses higher
voltage than normal, and it can not change a
partial contents. (Rewriting shall be done
upon erasing the all contents.)
There is a limit in a number of rewriting.

4-3-1 Trouble shooting with error code (INDOOR UNIT)

4-3 TROUBLE SHOOTING

04-11

Trouble shooting 2
INDOOR UNIT Error Method:

Power Frequency Abnormal

Indicate or Display:

Indoor Unit : Operation LED 3 times Flash, Timer LED 1 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E.5 U.1

Error Code : 3 1

Detective Actuators:

Indoor Unit Controller PCB Circuit

Detective details:

When 5 continuous failures occurred at Power frequency test.

Forecast of Cause : 1. Outside cause 2. Installation failure 3. Defective connection of electric components

4. Controller PCB defective

Check Point 2 : Check Installation condition

NO

Check Point 3 : Check connection of electric components

YES

Check Cable/Breaker
Check loose or removed connection

>> If Installation defect is found, correct it by referring

to Installation Manual.

OK

Check power supply voltage (AC230V between Indoor
unit terminal 1 and 2)
Check connection of Connector (any lose connector or
incorrect wiring)
Check any shortage or corrosion on PCB.

OK

AC

Check Point 1-1 : Reset Power Supply

Does abnormal LED indication show again?

Check Point 1-2 :
Check outside cause (Voltage drop or noise, etc.)

Instant drop ----- Check if there is a large load electric apparatus
in the same circuit.

Momentary power failure ----- Check if there is a defective
contact or leak current in the
power supply circuit.

Noise ----- Check if there is any equipment causing harmonic
wave near electric line (Neon bulb or electric
equipment that may cause harmonic wave).
Check the complete insulation of grounding.

Check Point 4 : Replace Controller PCB

Change Controller PCB and set up the original address.

04-12

Wrong power supply installation ----- Check if the power supply
frequency is stable or not.

Trouble shooting 3
INDOOR UNIT Error Method:

EEPROM Access Abnormal
(Indoor Unit Main PCB Error)

Indicate or Display:

Indoor Unit : Operation LED 3 times Flash, Timer LED 2 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E.5 U.1

Error Code : 3 2

Detective Actuators:

Indoor Unit Controller PCB Circuit

Detective details:

When 3 continuous failure occurred on read test of EEPROM.

Forecast of Cause :

1. Outside cause 2. Defective connection of electric component 3. Controller PCB defective

Check Point 1-2 :­Check outside cause (Voltage drop or noise, etc.)

Instant drop ----- Check if there is a large load electric apparatus
in the same circuit.

Momentary power failure ----- Check if there is a defective
contact or leak current in the
power supply circuit.

Noise ----- Check if there is any equipment causing harmonic
wave near electric line (Neon bulb or electric
equipment that may cause harmonic wave).
Check the complete insulation of grounding.

Check Point 3 : Replace Controller PCB

Change Controller PCB and set up the original address.

Check Point 1-1 : Reset Power Supply

Check Point 2 :
Check Indoor Unit electric components

YES

NO

Does abnormal LED indication show again?

Check all connectors (loose connector or incorrect wiring)
Check any shortage or corrosion on PCB.

OK

04-13

Trouble shooting 4
INDOOR UNIT Error Method:

Room Temperature Sensor Error

Indicate or Display:

Indoor Unit : Operation LED 4 times Flash, Timer LED 1 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E.5 U.1

Error Code : 4 1

Detective Actuators:

Indoor Unit Controller PCB Circuit
Indoor Temperature Thermistor

Detective details:

When Indoor thermistor open or shortage is detected at power ON.

Forecast of Cause :

1. Connector defective connection 2. Thermistor defective 3. Controller PCB defective

Check Point 2 : Remove connector and check Thermistor resistance value

Thermistor Characteristics (Rough value)

If Thermistor is either open or shorted, replace it and reset the power.

Check Point 1 : Check connection of Connector

Check if connector is loose or removed
Check erroneous connection
Check if thermistor cable is open

>>Reset Power when reinstalling due to removed connector or incorrect wiring.

6.5

35

8.0

30

10.012.515.820.125.233.6Resistance Value ( )

2520151050

Temperature (°C)

3.54.35.3Resistance Value ( )

504540

Temperature (°C)

OK

OK

Check Point 3 : Check voltage of Controller PCB (DC5.0V)

Make sure circuit diagram of each indoor unit and check terminal voltage at Thermistor (DC5.0V)

Small size Wall mount Schematic Diagram(Direct soldering to PCB)

If the voltage does not appear, replace Controller PCB and set up the original address.

H/E Inlet Thermistor
(CN20 Wire:Black)

H/E Outlet Thermistor
(CN20 Wire:Gray)

Room Temp. Thermistor
(CN19 Wire:Black)

Room Temp. Thermistor

(CN10 Wire:Black)

H/E Intlet Thermistor

(CN12 Wire:Black)

H/E Outlet Thermistor

(CN11 Wire:Gray)

DC

Cassette Schematic Diagram (Connector connection)

Wall mount Schematic Diagram (Connector connection)

H/E Outlet Thermistor
(CN9 Wire:Gray)

H/E Inlet Thermistor
(CN9 Wire:Black)

Room Temp. Thermistor
(CN8 Wire:Black)

H/E Outlet Thermistor
(CN17Wire:Gray)

H/E Inlet Thermistor
(CN17 Wire:Black)

Room Temp. Thermistor
(CN16 Wire:Black)

04-14

Duct Schematic Diagram (Connector connection)

Thermistor Characteristics (Rough value)

If Thermistor is either open or shorted, replace it and reset the power.

Trouble shooting 5
INDOOR UNIT Error Method:

Heat Exchanger Inlet Sensor Error

Indicate or Display:

Indoor Unit : Operation LED 4 times Flash, Timer LED 2 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E.5 U.1

Error Code : 4 2

Detective Actuators:

Indoor Unit Controller PCB Circuit
Heat Exchanger Inlet Thermistor

Detective details:

When open or shorted Heat Exchanger Inlet Thermistor is detected
at Power ON.

Resistance Value ( )

Temperature (°C)

32.4

35

40.0

30

49.862.579.1100.9129.8168.6

2520151050

Resistance Value ( )

Temperature (°C)

17.821.226.3

504540

OK

Forecast of Cause :

1. Connector defective connection 2. Thermistor defective 3. Controller PCB defective

Check Point 1 : Check connection of Connector

Check if connector is loose or removed
Check erroneous connection
Check if thermistor cable is open

>>Reset Power when reinstalling due to removed connector or incorrect wiring.

OK

Check Point 2 : Remove connector and check Thermistor resistance value

Check Point 3 : Check voltage of Controller PCB (DC5.0V)

Make sure circuit diagram of each indoor unit and check terminal voltage at Thermistor (DC5.0V)

Small size Wall mount Schematic Diagram(Direct soldering to PCB)

If the voltage does not appear, replace Controller PCB and set up the original address.

H/E Inlet Thermistor
(CN20 Wire:Black)

H/E Outlet Thermistor
(CN20 Wire:Gray)

Room Temp. Thermistor
(CN19 Wire:Black)

Room Temp. Thermistor

(CN10 Wire:Black)

H/E Intlet Thermistor

(CN12 Wire:Black)

H/E Outlet Thermistor

(CN11 Wire:Gray)

04-15

DC

Cassette Schematic Diagram (Connector connection)

Wall mount Schematic Diagram (Connector connection)

H/E Outlet Thermistor
(CN9 Wire:Gray)

H/E Inlet Thermistor
(CN9 Wire:Black)

Room Temp. Thermistor
(CN8 Wire:Black)

H/E Outlet Thermistor
(CN17 Wire:Gray)

H/E Inlet Thermistor
(CN17 Wire:Black)

Room Temp. Thermistor
(CN16 Wire:Black)

Duct Schematic Diagram (Connector connection)

Trouble shooting 6
INDOOR UNIT Error Method:

Heat Exchanger Outlet Sensor Error

Indicate or Display:

Indoor Unit : Operation LED 4 times Flash, Timer LED 2 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E.5 U.1

Error Code : 4 2

Detective Actuators:

Indoor Unit Controller PCB Circuit
Heat Exchanger Outlet Thermistor

Detective details:

When open or shorted Heat Exchanger outlet Thermistor is detected at Power
ON.

Forecast of Cause : 1. Connector defective connection 2.Thermistor defective 3.Controller PCB defective

Check Point 1 : Check connection of Connector

Check if connector is loose or removed
Check erroneous connection
Check if thermistor cable is open

>>Reset Power when reinstalling due to removed connector or incorrect wiring.

OK

Thermistor Characteristics (Rough value)

If Thermistor is either open or shorted, replace it and reset the power.

Check Point 2 : Remove connector and check Thermistor resistance value

Resistance Value ( )

Temperature (°C)

32.4

35

40.0

30

49.862.579.1100.9129.8168.6

2520151050

Resistance Value ( )

Temperature (°C)

17.821.226.3

504540

04-16

OK

Check Point 3 : Check voltage of Controller PCB (DC5.0V)

Make sure circuit diagram of each indoor unit and check terminal voltage at Thermistor (DC5.0V)

Small size Wall mount Schematic Diagram(Direct soldering to PCB)

If the voltage does not appear, replace Controller PCB and set up the original address

H/E Inlet Thermistor
(CN20 Wire:Black)

H/E Outlet Thermistor
(CN20 Wire:Gray)

Room Temp. Thermistor
(CN19 Wire:Black)

Room Temp. Thermistor

(CN10 Wire:Black)

H/E Intlet Thermistor

(CN12 Wire:Black)

H/E Outlet Thermistor

(CN11 Wire:Gray)

DC

Cassette Schematic Diagram (Connector connection)

Wall mount Schematic Diagram (Connector connection)

H/E Outlet Thermistor
(CN9 Wire:Gray)

H/E Inlet Thermistor
(CN9 Wire:Black)

Room Temp. Thermistor
(CN8 Wire:Black)

H/E Outlet Thermistor
(CN17 Wire:Gray)

H/E Inlet Thermistor
(CN17 Wire:Black)

Room Temp. Thermistor
(CN16 Wire:Black)

Duct Schematic Diagram (Connector connection)

Trouble shooting 7
INDOOR UNIT Error Method:

Water Drain Abnormal

Indicate or Display:

Indoor Unit : Operation LED 5 times Flash, Timer LED 3 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E.5 U.1

Error Code : 5 3

Detective Actuators:

Indoor Unit Controller PCB Circuit
Float Switch

Detective details:

When Float switch is ON for more than 3 minutes.

Check Point 1 : Check Float Switch

Check operation of float switch. (any blocking by dust, etc.)
Remove Float switch and check ON/OFF switching operation

by using a meter.

>>If Float switch is defective, replace it.

ON OFF

OK

Forecast of Cause : 1. Float switch defective 2. Shorted connector/wire 3. Controller PCB defective 4. Drain pump defective

Check Point 2 : Check Connector (CN 1) / Wire

Check loose contact of CN1 /shorted wire (pinched wire).

>>Replace Float switch if the wire is abnormal

Check Point 3 : Check Controller PCB

If Check Point 1 & 2 do not improve the symptom, change

Controller PCB and set up the original address.

Attention!!

Small size wall mount type does not have a
float switch. In this case, replace Controller PCB
and set up the original address. Please refer to.

OK

04-17

Trouble shooting 8
INDOOR UNIT Error Method:

Indoor Unit Fan Motor Error

Indicate or Display:

Indoor Unit : Operation LED 5 times Flash, Timer LED 1 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E.5 U.1

Error Code : 5 1

Detective Actuators:

Indoor Unit Controller PCB Circuit
Indoor Fan Motor

Detective details:

When Indoor fan control is either phase control or DC control and rotation feed
back control is ON, the feed back rotation value becomes 0 and lasts for more
than 1 minute at motor operation condition. Or, the feed back rotation value
continues at 1/3 of target value for more than 1 minute.

Check Point 2 : Check Motor winding

Check Indoor Fan motor

>>If Fan motor is abnormal, replace it.

Check Point 1 : Check rotation of Fan

Rotate the fan by hand when operation is off.

(Check if fan is caught, dropped off or locked motor)

>>If Fan or Bearing is abnormal, replace it.

Check Point 3 : Check ambient temp. around motor

Check excessively high temperature around the motor.

(If there is any surrounding equipment that causes heat)

>>Upon the temperature coming down, restart operation..

Check Point 4 : Check Motor Capacitor

Check continuity of motor capacitor

>>If it is shorted, replace the capacitor.

Check Point 5 : Replace Controller PCB

OK

OK

OK

OK

Forecast of Cause : 1. Fan rotation failure 2. Fan motor winding open 3. Motor protection by surrounding temp. increase

4. Capacitor failure 5. Control PCB failure

Attention!!

In case of Duct type, replace Controller PCB
and set up the original address, since it is a
tapping control.

Change Controller PCB and set up the original address.

04-18

Trouble shooting 9
INDOOR UNIT Error Method:

Wired Remote Controller
Communication Error

Indicate or Display:

Indoor Unit : Operation LED 1 times Flash, Timer LED 2 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E.5 U.1

Error Code : 1 2

Detective Actuators:

Indoor unit controller PCB circuit
Wired Remote Control

Detective details:

Upon receiving the signal more than 1 time from Wired Remote or other Indoor
unit, but the same signal has not been received more than 1 minute.

Check Point 2 : Check Remote and Controller PCB

Check terminal voltage of controller PCB Connector. (Power supply for Remote)

If DC12V, Remote Control failure (Controller PCB is OK) >>> Replace Remote
If DC0V, Controller PCB failure (Remote is OK) >>> Replace Controller PCB

-In case of re-installation is done due to removed connector or incorrect

wiring, turn on the power again.

Check Point 1 : Check the connection of terminal

After turning off the power, check & correct the followings.

Indoor Unit - Check the connection of terminal between remote control and Indoor unit, or between Indoor units, and

check if there is a disconnection or short of the cable.

Trouble shooting 9
INDOOR UNIT Error Method:

Wired Remote Controller Token Error

Indicate or Display:
Indoor Unit : Operation LED 1 times Flash, Timer LED 2 Times Flash,
Filter LED Continuous Flash.
Outdoor Unit : E.5 U.1, Error LED Continuous Flash.
Remote Controller : 1 2

Detective Actuators:

Indoor unit Controller PCB circuit
Wired Remote Control

Detective details:

More than 1 time of Token (Communication between wired remote controllers)
is received, but it was not received more than 1 minute.

OK

DC

Forecast of Cause : 1. Terminal connection abnormal 2. Wired Remote Control failure 3. Controller PCB failure

Forecast of Cause : 1. Terminal connection abnormal 2. Mis-setting 3. Wired Remote Control failure 4. Controller PCB failure

Check Point 1 : Check the connection of terminal

After turning off the power, check & correct the followings.

Indoor Unit - Check the connection of terminal between remote control and Indoor unit, or between Indoor units, and

check if there is a disconnection or short of the cable.

OK

04-19

Cassette Type CN5 , AS*E 07,09,12,14LACH / AS*A 07,09,12,14LACH Type CN7 , Other CN17

Check Point 2 : Check Remote and Controller PCB

Check terminal voltage of Controller PCB Connector. (Power supply for Remote)

If DC12V, Remote Control failure (Controller PCB is OK) >>> Replace Remote
lIf DC0V, Controller PCB failure (Remote is OK) >>> Replace Conroller PCB

In case of re-installation is done due to removed connector or incorrect

wiring, turn on the power again.

DC

Cassette Type CN5 , AS*E 07,09,12,14LACH / AS*A 07,09,12,14LACH Type CN7 , Other CN17

Trouble shooting 10
INDOOR UNIT Error Method:

Indoor Unit Parallel Communication
Error

Indicate or Display:

Indoor Unit : Operation LED 1 times Flash, Timer LED 6 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E.5 U.1

Error Code : 1 6

Detective Actuators:

Indoor unit Controller PCB circuit
Indoor unit Communication PCB

Detective details:

When Parallel communication error (Communication reset occurs continuously
more than specified times) is detected.

Check Point 3 : Replace Communication PCB

Replace Communication PCB (If the symptom does not
change, replace Controller PCB and set up the original
address.

Check Point 1-2 : Check outside cause such as noise

Check the complete insulation of the grounding.

Check if there is any equipment that causes harmonic wave near
the power cable (Neon light bulb or any electronic equipment which
causes harmonic wave).

Check Point 1-1 : Reset the power

Check Point 2 : Check Connection

YES

NO

Does LED error indication reappear?

Check if Indoor Communication PCB is removed.

OK

Forecast of Cause : 1. Connection failure 2. Outside cause 3. Communication PCB failure 4. Controller PCB failure

04-20

Trouble shooting 11
INDOOR UNIT Error Method:

Network Communication Error

Indicate or Display:

Indoor Unit : Operation LED 1 times Flash, Timer LED 4 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E.5 U.1

Error Code : 1 4

Detective Actuators:

Indoor unit Controller PCB circuit
Indoor unit Communication PCB

Detective details:

When the cut-off of network communication is detected (more than 90 seconds
passed since the last receipt of Outdoor unit signal).

Check Point 2 : Check if any outside cause such as voltage drop or noise

Instant voltage drop ----- Check if there is any electric equipment with a large load within the same circuit.
Momentary power failure ----- Check contact failure or leak current in power supply circuit

>>Check Outdoor Unit as well.

Check if there is any equipment that causes harmonic wave near the power cable (Neon light bulb or any electronic equipment which

causes harmonic wave). And check the complete insulation of grounding.

>>If the same symptom does not reappear after resetting the power, possibility of noise is high.

Check Point 1 : Check the connection

After turning off the power, check and correct followings.

Is Indoor Communication PCB loose?
Check loose or removed connection of communication line between Indoor

and Outdoor unit.

When the signal amplifier is connected , is it failure of signal amplifier?
(Refer to "TROUBLE SHOOTING FOR OPTIONAL PARTS")

Check Point 3 : Check Communication PCB and Controller PCB

If some of Indoor units have errors, replace Communication PCB of the Indoor units that have the error.

>>If the symptom does not change, replace Indoor unit Controller PCB.

If all the Indoor units have error, check if the Outdoor Unit Communication PCB has a loose connection.

>>If the symptom does not change, replace Outdoor unit Communication PCB (Replace Controller PCB if it does not change).

OK

OK

Forecast of Cause : 1. Connection failure 2. Outside cause 3. Communication PCB failure 4. Controller PCB failure

04-21

Initial Setting Error

Outdoor unit main PCB

Check Point 1 : Check the power supply

Main power ON/OFF state check
Power cable connection, open check

OK

Check Point 2 : Check the outdoor unit address/number of
connected slave units setting

Setting check of outdoor unit address of each outdoor unit

Outdoor unit address

SET 3-1 SET 3-2

Master

OFF OFF

OK

Check Point 3 : Replace Main PCB

Change Main PCB and set up the original address.

4-3-2 Trouble Shooring With Error Code (OUTDOOR UNIT)

1. Wrong DIP SW setting

2. Power supply defective

3. Main PCB defective

Indoor Unit : No Display

Outdoor Unit : - - - - ( Flashing 0.5 sec. ON and OFF )

Error Code : No Display

04-22

Trouble shooting 12

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

When the DIP SW setting was wrong, after turned on the power supply

Outdoor Unit Network
Communication 1 Error

OK

Communication PCB connection check

Communication PCB check

OK

Communication line connection, open check

OK

OK

Check Point 5 : Check the communication PCB (outdoor unit/indoor unit)

OK

Outdoor unit Main PCB
Outdoor unit communication PCB

1. Noise, momentary open, voltage drop 2. Indoor unit power off

3. Communication line connection defective 4. Terminal resistor setting mistake

5. Communication PCB mounting defective, Communication PCB defective 6. Main PCB defective

Check Point 1 : Noise, momentary open, voltage drop

Check if temporary voltage drop was not generated.
Check if momentary open was not generated.
Check if ground is connection correctly or there are no related cables near the power line.

Check Point 2 : Check the indoor unit power supply

Main power ON check

Power cable connection and open check

Check Point 3 : Check the communication line connection

No communication for 180 seconds or more from an indoor unit which
received communication once and no outdoor network communication error 2.

Check Point 4 : Check the Terminal resistor setting

T

erminal resistor setting check

Check Point 6 : Replace Main PCB (outdoor unit / indoor unit)

Change Main PCB and set up the original address.

Indoor Unit : No display

Outdoor Unit : E. 14. 1

Error Code : 14

04-23

Trouble shooting 13

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

OUTDOOR UNIT Error Method ::

Outdoor Unit Network
Communication 2 Error

OK

Communication PCB connection check

Communication PCB check

OK

Communication line connection, open check

OK

OK

OK

Outdoor unit Main PCB
Outdoor unit communication PCB

Check Point 1 : Noise, momentary open, voltage drop

Check if temporary voltage drop was not generated.
Check if momentary open was not generated.
Check if ground is connection correctly or there are no related cables near the power line.

Check Point 2 : Check the indoor unit power supply

Main power ON check

Power cable connection and open check

Check Point 3 : Check the communication line connection

Detective Actuators:

Forecast of Cause :

No communication for 180 seconds or more from all indoor units that once
received communication

Check Point 4 : Check the Terminal resistor setting

Terminal resistor setting check

Check Point 6 : Replace Main PCB (outdoor unit / in door unit)

Check Point 5 : Check the communication PCB (outdoor unit/indoor unit)

Change Main PCB and set up the original address.

Detective details:

1. Noise, momentary open, voltage drop 2. Indoor unit power off

3. Communication line connection defective 4. Terminal resistor setting mistake

5. Communication PCB mounting defective, Communication PCB defective 6. Main PCB defective

Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E. 14. 2

Error Code : 14

04-24

Trouble shooting 14

Indicate or Display:

Outdoor Unit EEPROM Access Error

YES

NO

Check Point 1-2 : Noise, momentary open, voltage drop

Outdoor unit Main PCB

Access to EEPROM failed due to some cause after outdoor unit started.

1. Noise, momentary open, voltage drop 2. Main PCB defective

Check if temporary voltage drop was not generated.
Check if momentary open was not generated.
Check if ground is connection correctly or there are no related cables near the

power line.

Check Point 2 : Replace Main PCB

Change Main PCB and set up the original address.

Check Point 1-1 : Turn the power
on agaun.

Error displayed again?

Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E. 62. 3

Error Code : 62

04-25

Trouble shooting 15

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

Inverter Communication Error

YES

NO

OK

OK

Outdoor unit Main PCB
Outdoor unit Inverter PCB

Check Point 2 : Check the main to Inverter PCB wiring

Connector connection state check

Cable open check

Check Point 3 : Check Main PCB

Chack Main PCB. (Refer to "Sarvise Parts Information )

1. Noise 2. Main to Inverter PCBs wiring connection defective

3. Main PCB defective 4. Inverter PCB defective

Check Point 4 : Replace Inverter PCB

Replace Inverter PCB.

Check if ground is connection correctly or there are no related cables near the
power line.

Check Point 1-1 : Turn the power
on again.

Error displayed again?

Check Point 1-2 : Noise

Communication not received from Inverter PCB for 10 seconds or more

Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E. 62. 6

Error Code : 62

04-26

Trouble shooting 16

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

EEPROM Data corrupted Error

*

YES NO

Outdoor unit Main PCB

1. Noise, momentary open, voltage drop 2. Main PCB defective

Check if temporary voltage drop was not generated.
Check if momentary open was not generated.
Check if ground is connection correctly or there are no related cables near the power line.

Check Point 2 : Replace Main PCB

Change Main PCB and set up the original address.

Check Point 1-1 : Turn the power on again.

Error generated again after Field setting all clear (push button SW F3
(function mode) -35 execution) and the power was turned back on?

Set contents sum value memorized in EEPROM and sum value calculated
based on the set contents read from EEPROM do not match
Regarding the sum value, only the contents set in the push button SW
setting mode (F2) shall be the objective.

Reset the setting of F2 (setting mode) by push button SW.
* To clear the setting of F2 by Field setting all clear.

Check Point 1-2 : Noise, momentary open, voltage drop

Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E. 62. 8

Error Code : 62

04-27

Trouble shooting 17

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

Inverter Error

YES

NO

OK

Check Point 1-2 : Noise, momentary open, voltage drop

Inverter PCB

Error information received from Inverter PCB

1. Noise, momentary open, voltage drop. 2. Power supply to Filter PCB (INV) to Inverter PCB
wiring disconnection, open 3. Filter PCB ( INV) defective 4. Inverter PCB defective

Check if temporary voltage drop was not generated.
Check if momentary open was not generated.
Check if ground is connection correctly or there are no related cables near the

power line.

Check Point 2 : Check the wiring (Power supply to Filter PCB (INV) to Inverter PCB)

Connector and wiring connection state check
Cable open check

Check Filter PCB (INV) and Inverter PCB.

Check Point 1-1 : Turn the power
on again.

Error displayed again?

Check Point 3 : Check Filter PCB (INV) and Inverter PCB

Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E. 63. 1

Error Code : 63

04-28

Trouble shooting 18

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

Filter PCB

Inverter PCB short interruption
detection

OK

OK

OK

Inverter PCB

Check Point 1 : Noise, momentary power failure, voltage drop

Check if temporary voltage drop was not generated.
Check if momentary power failure was not generated.
Check if ground is connection correctly or there are no related cables near the power line.

Cable open check

Check Point 2 : Check the wiring (Power supply to Filter PCB (INV) to
Inverter PCB)

Connector and wiring connection state check

Check Point 3 : Check Main PCB

Check Main PCB Power supply

Check Point 4 : Replace Inverter PCB

Replace Inverter PCB.

1. Noise, momentary power failure, voltage drop

2. Power supply to Filter PCB (INV) to Inverter PCB wiring disconnection, open

3. Main PCB defective 4. Inverter PCB defective

''Momentary power failure" received from Inverter PCB

Indoor Unit : No Display

Outdoor Unit : E. 67. 2

Error Code : 67

04-29

Trouble shooting 19

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

OUTDOOR UNIT Error Method:
Outdoor Unit transmission PCB

Parallel Communication Error

YES

OK

OK

Check Point 1-2 : Noise

Detective details:

Forecast of Cause :

NO

Detective Actuators:

Outdoor unit Main PCB
Communication PCB

Parallel communication (communication between main CPU and
communication PCB ) failed 5 times.

1. Noise 2. Communication PCB connection defective

3. Communication PCB defective 4. Main PCB defective

Check if ground is connection correctly or there are
no related cables near the power line.

Check Point 4 : Replace Main PCB

Change Main PCB and set up the original address.

Check Point 1-1 : Turn the power
on again.

Error displayed again?

Check Point 2 : Check the communication PCB connection

Communication PCB connection check

Check Point 3 : Check the communication PCB

Communication PCB check

Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E. 69. 1

Error Code : 69

04-30

Trouble shooting 20

Indicate or Display:

Discharge Temp Sensor Error

OK

OK

DC

CN141

THERMISTOR

(COMP SHELL )

< TH10 >

THERMISTOR

(DIS.TEMP )

< TH1 >

BLACK

BLACK

BLA

C

K

BLA

C

K

1 2 3 4 5 6

1 2 3 4 5 6

Discharge temperature thermistor 1

Discharge temperature thermistor 1 short detected
Discharge thermistor 1 open detected after compressor 1 operated
continuously for 5 minutes or more

1. Connector connection defective, open

2. Thermistor defective

3. Main PCB defective

Check Point 1 : Check the connector connection and cable open

Connector connection state check
Cable open check

Check Point 2 : Check the thermistor

Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
* For the thermistor characteristics, refer to the "Service Parts Information 22".

Check Point 3 : Check voltage of Main PCB (DC5.0V)

Main PCB (CN141:1-2) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.

If the voltage does not appear, replace Main PCB and set up orignal address.

Discharge temperature sensor 1 (CN141:1-2)

Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E. 71. 1

Error Code : 71

04-31

Trouble shooting 21

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

Compressor Temp Sensor Error

DC

CN141

THERMISTOR

(COMP SHELL1)

<TH10>

THERMISTOR

(DIS.TEMP.1)

<TH1>

BLA

C

K

BLA

C

K

BLACK

BLACK

1 2 3 4 5 6

1 2 3 4 5 6

Compressor temperature thermistor 1

Compressor temperature thermistor 1 short detected
Compressor thermistor 1 open detected after compressor 1 operated
continuously for 5 minutes or more

1. Connector connection defective, open

2. Thermistor defective

3. Main PCB defective

OK

OK

Check Point 1 : Check the connector connection and cable open

Connector connection state check

Cable open check

Check Point 2 : Check the thermistor

Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
* For the thermistor characteristics, refer to the "Service Parts Information 22".

Check Point 3 : Check voltage of Main PCB (DC5.0V)

Main PCB (CN141:5-6) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.

Compressor temperature sensor 1 (CN141:5-6)

Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E. 72. 1

Error Code : 72

If the voltage does not appear, replace Main PCB and set up orignal address.

04-32

Trouble shooting 22

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

DC

CN143

THERMISTOR

THERMISTOR

(SUC. TEMP.)

< TH4 >

(HEX. EXIT.)

< TH5 >

BLACK

BLACK

1 2 3 4

1 2 3 4

BLACK

BLA

C

K

Heat exchanger liquid temperature
thermistor

Heat exchanger liquid temperature thermistor short or open detected

1. Connector connection defective, open

2. Thermistor defective

3. Main PCB defective

OK

OK

Check Point 1 : Check the connector connection and cable open

Connector connection state check

Cable open check

Check Point 2 : Check the thermistor

Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
* For the thermistor characteristics, refer to the "Service Parts Information 22".

Check Point 3 : Check voltage of Main PCB (DC5.0V)

Main PCB (CN143:3-4) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.

Heat exchanger liquid temperature sensor (CN143:3-4)

Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E. 73. 3

Error Code : 73

If the voltage does not appear, replace Main PCB and set up orignal address.

If the voltage does not appear, replace Main PCB and set up orignal address.

04-33

Outdoor Unit Heat Ex. Liquid Temp.
Sensor Error

Trouble shooting 23

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

Outdoor Temp Sensor Error

OK

DC

CN144

(OUT TEMP.)

< TH3 >

THERMISTOR

1 2 3

1 2 3

B

LA

CK

BLA

C

K

Outdoor temperature thermistor

Outdoor temperature thermistor short or open detected

1. Connector connection defective, open

2. Thermistor defective

3. Main PCB defective

OK

Check Point 1 : Check the connector connection and cable open

Connector connection state check
Cable open check

Check Point 2: Check the thermistor

Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
* For the thermistor characteristics, refer to the "Service Parts Information ".

Check Point 3 : Check voltage of Main PCB (DC5.0V)

Main PCB (CN144:1-3) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.

Outdoor temperature sensor (CN144:1-3)

Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E. 74. 1

Error Code : 74

If the voltage does not appear, replace Main PCB and set up orignal address.

If the voltage does not appear, replace Main PCB and set up orignal address.

04-34

Trouble shooting 24

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

Suction Gas Temp Sensor Error

OK

DC

CN143

BLACK

BLA

C

K

1 2 3 4

1 2 3 4

BLACK

BLACK

Suction gas temperature thermistor

Suction gas temperature thermistor short or open detected

1. Connector connection defective, open

2. Thermistor defective

3. Main PCB defective

OK

Check Point 1 : Check the connector connection and cable open

Connector connection state check
Cable open check

Check Point 2 : Check the thermistor

Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
* For the thermistor characteristics, refer to the "Service Parts Information 22".

Check Point 3 : Check voltage of Main PCB (DC5.0V)

Main PCB (CN143:1-2) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.

Suction gas temperature sensor (CN143:1-2)

Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E. 75. 1

Error Code : 75

If the voltage does not appear, replace Main PCB and set up orignal address.

04-35

THERMISTOR

(HEX. EXT)

< TH5 >

THERMISTOR

(SUC. TEMP)

< TH4 >

Trouble shooting 25

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

Heat Sink Temp Sensor Error

Inverter PCB

Heat sink temperature thermistor ( Inside IPM ) open/short circuit detected

Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.

Outdoor Unit : E. 77. 1

Error Code : 77

04-36

Trouble shooting 26

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

1. Inverter PCB failure

Forecast of Cause :

If this error is displayed, replace Inverter PCB