Fujitsu AS*G18LFCA, AO*G18LFC Service Instruction

SPLIT TYPE
ROOM AIR CONDITIONER

WALL MOUNTED

INVERTER

SERVICE

INSTRUCTION

Models Indoor unit Outdoor unit

AS*G18LFCA

type

AO*G18LFC

R410A

CONTENTS

1. DESCRIPTION OF EACH CONTROL OPERATION

1. COOLING OPERATION................................................................................................

2. HEATING OPERATION.................................................................................................

3. DRY OPERATION.........................................................................................................

4. AUTO CHANGEOVER OPERATION............................................................................

5. INDOOR FAN CONTROL..............................................................................................

6. OUTDOOR FAN CONTROL..........................................................................................

7. LOUVER CONTROL.....................................................................................................

8. COMPRESSOR CONTROL..........................................................................................

9. TIMER OPERATION CONTROL...................................................................................

10. ELECTRONIC EXPANSION VALVE CONTROL........................................................

11. TEST OPERATION CONTROL...................................................................................

12. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST ).................................

13. FOUR-WAY VALVE EXTENSION SELECT................................................................

14. AUTO RESTART.........................................................................................................

15. MANUAL AUTO OPERATION ( Indoor unit body operation ).....................................

16. FORCED COOLING OPERATION..............................................................................

17. COMPRESSOR PREHEATING..................................................................................

18. 10°C HEAT OPERATION............................................................................................ 01-14

01-01
01-02
01-02
01-03
01-04
01-06
01-07
01-08
01-09
01-12
01-12
01-12
01-12
01-13
01-13
01-13
01-14

19. ECONOMY OPERATION............................................................................................

20.

DEFROST OPERATION CONTROL...........................................................................

21. OFF DEFROST OPERATION CONTROL...................................................................

22. VARIOUS PROTECTIONS.......................................................................................... 01-18

2. TROUBLE SHOOTING

2-1 ERROR DISPLAY.......................................................................................................

2-1-1 INDOOR UNIT AND WIRED REMOTE CONTROLLER DISPLAY.....................

2-1-2 WIRED REMOTE CONTROLLER DISPLAY (OPTION)....................................

2-2 TROUBLE SHOOTING WITH ERROR CODE............................................................

2-3 TROUBLE SHOOTING WITH NO ERROR CODE.....................................................

2-4 SERVICE PARTS INFORMATION.............................................................................. 02-28

3. APPENDING DATA

3-1 FUNCTION SETTING.................................................................................................

3-1-1 INDOOR UNIT....................................................................................................

01-14
01-15
01-17

02-01
02-01
02-02
02-03
02-23

03-01
03-01

3-1-2 Procedures to change the Function Setting for wireless RC..............................

3-2 Outdoor unit Pressure Value and Total Electric Current Curve................................... 03-05

3-3 Thermistor Resistance Values.....................................................................................

3-3-1 INDOOR UNIT....................................................................................................

3-3-2 OUTDOOR UNIT................................................................................................

03-03

03-07
03-07
03-07

WALL MOUNTED type

R410A

INVERTER

1 . DESCRIPTION OF EACH
CONTROL OPERATION

1. COOLING OPERATION

1-1 COOLING CAPACITY CONTROL

A sensor (room temperature thermistor) built in the indoor unit body will usually perceive
difference or variation between a set temperature and present room temperature, and
controls the operation frequency of the compressor.
* If the room temperature is 2°C higher than a set temperature, the compressor operation
frequency will attain to maximum performance.

* If the room temperature is 2.5°C lower than a set temperature, the compressor will be
stopped.

* When the room temperature is between +2°C to -2.5°C of the setting temperature,
the compressor frequency is controlled within the range shown in Table1.
However, the maximum frequency is limited in the range shown in Fig.1 based on the
fan speed mode and the outdoor temperature.

( Table 1 : Compressor Frequency Range )

minimum
frequency

maximum
frequency

maximum
frequency

AO*G18LFC 18rps 70rps 113rps

( Fig. 1 : Limit of Maximum Frequency based on Outdoor Temperature )

Outside air Outside air
temperature temperature

A zone 113rps
B zone
C zone
D zone
E zone
F zone

113rps
95rps
58rps
58rps
58rps

34°C

30°C

19°C

10°C

0°C

A zone

B zone

C zone

D zone

E zone

36°C

32°C

21°C

12°C

2°C

18LFC

Hi Me Lo Quiet

66rps
66rps
66rps
45rps
45rps
45rps

54rps
54rps
54rps
30rps
30rps
30rps

34rps
34rps
34rps
24rps
24rps
24rps

F zone

When the compressor operates for 30 minutes continuously at over the maximum frequency ,
the maximum frequency is changed from Maximum Frequency to Maximum Frequency .

01-01

2. HEATING OPERATION

2-1 HEATING CAPACITY CONTROL

A sensor (room temperature thermistor) built in the indoor unit body will usually perceive
difference or variation between a set temperature and present room temperature, and
controls the operation frequency of the compressor.
* If the room temperature is lower by 3°C than a set temperature, the compressor operation
frequency will attain to maximum performance.

* If the room temperature is higher 2.5°C than a set temperatire, the compressor will be stopped.
* When the room temperature is between +2.5°C to -3°C of the setting temperature,

the compressor frequency is controlled within the range shown in Table2.

( Table 2 : Compressor Frequency Range )

minimum
frequency

AO*G18LFC 18rps 130rps

* The room temperature is controlled 2°C higher than the setting temperature for 60 minutes
after starting the operation.
After 60 minutes, it is controlled based on the normal setting temperature.

maximum
frequency

3. DRY OPERATION

3-1 INDOOR UNIT CONTROL

The compressor rotation frequency shall change according to the temperature, set temperature,
and room temperature variation which the room temperature sensor of the indoor unit body has
detected as shown in the Table 3.
However, after the compressor is driven, the indoor unit shall run at operation frequency of
58rps, for a minute.

( Table 3 : Compressor frequency )

Operating
frequency

18LFC

X zone
J zone
Y zone

34rps
20rps

0rps

( Fig.2 : Compressor Control based on Room Temperature )

Room Room
temperature temperature

Ts+1.5°C

Ts+0.5°C

Ts -1.5°C

X zone

Ts -0.5°C

J zone

Y zone

01-02

4. AUTO CHANGEOVER OPERATION

When the air conditioner is set to the AUTO mode by remote control, operation starts in the optimum
mode from among the HEATING, COOLING, DRY and MONITORING modes. During operation, the
optimum mode is automatically switched in accordance with temperature changes. The temperature
can be set between 18°C and 30°C in 1°C steps.

Operation flow chart

START

Room temp.

>Ts+2°C ?

NO

YES

YES

or operation command other than

Room temp.

<Ts- 2°C ?

HEATING OPERATION

Thermostat remains

in OFF state for 6 minutes or

longer?

System stops

auto changeover operation?

NO

YES

NO

YES

TS : Setting temperature

in OFF state for 6 minutes or

or operation command other than

auto changeover operation?

COOLING OPERATION

Thermostat remains

longer?

NO

System stops

YES

YES

NO

NO

01-03

5. INDOOR FAN CONTROL

1. Fan speed

( Table 4 : Indoor Fan Speed )

AS*G18LFCA

Operation mode Air flow mode Speed (rpm)
Heating

Cooling

Dry

2. FAN OPERATION

The airflow can be switched in 5 steps such as AUTO, QUIET, LOW, MED, HIGH,
while the indoor fan only runs.
When Fan mode is set at (Auto), it operates on (MED) Fan Speed.

Hi
Me+
Me
Lo

Quiet

Cool air prevention

S-Lo
Hi
Me
Lo

Quiet

1220
1120
1020

900
710
660

270
1220
1020

900

710

X zone: 710

J zone: 660

3. COOLING OPERATION

Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature,
as shown in Figure 3.
On the other hand, if switched in [HIGH] [QUIET], the indoor motor will run at a constant airflow of [COOL]
operation modes QUIET, LOW, MED, HIGH,as shown in Table 4.

( Fig.3 : Airflow change - over ( Cooling : AUTO ) )

°C

=

=

TR-Ts > 2 °C

2

°C > TR-Ts > 1 °C

=

1

°C > TR-Ts

HIGH mode

=

TR-Ts > 2.5

°C > TR-Ts > 1.5 °C

2.5

MED mode

1.5

°C > TR-Ts

LOW mode

When the room
temperature drops

When the room
temperature rises

TR : Room temperature
Ts : Setting temperature

4. DRY OPERATION

Refer to the Table 4.
During the dry mode operation, the fan speed setting can not be changed.

01-04

5. HEATING OPERATION

Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature,
as shown in Fig.4.

On the other hand, if switched in [HIGH] [QUIET], the indoor motor will run at a constant airflow
of [HEAT] operation modes QUIET, LOW, MED, HIGH, as shown in Table 4.

( Fig.4 : Airflow change - over ( Heating : AUTO ) )

TR-Ts > - 1 °C

°C > TR-Ts > - 2 °C

- 1

°C > TR-Ts

- 2

TR : Room temperature
Ts : Setting temperature

When the room
temperature rises

=

=

LOW mode

MED mode

MED+ mode

When the room
temperature drops

TR-Ts > - 1.5 °C

=

°C > TR-Ts > - 2.5 °C

- 1.5

- 2.5

°C > TR-Ts

=

6. COOL AIR PREVENTION CONTROL (Heating mode)

The maximum value of the indoor fan speed is set as shown in Fig.5, based on the detected
temperature by the indoor heat exchanger sensor on heating mode.

(Fig.5 : Cool Air Prevention Control)

Indoor heat exchanger
temperature

42°C

39°C

37°C

30°C

Hi

Me+

Lo

Cool air
prevention

S-Lo

Indoor heat exchanger
temperature

37°C

34°C

32°C

28°C

7. MOISTURE RETURN PREVENTION CONTROL (Cooling mode& Dry mode)

Switch the airflow [Auto] at cooling mode, and the indoor fan motor will run as shown in Fig.6.

8. INDOOR UNIT FAN (ONTROL FOR ENERGY SAVING (Cooling mode)

It depends on the function setting "Indoor unit fan control for energy saving" at cooling mode,
and the indoor fan motor will run as shown in Fig 6.

( Fig.6 : Indoor Fan Control )

Compressor

ON

OFF

Indoor fan
Setting air flow

Indoor fan
(as shown in Table 5)

S-Lo

OFF

10 30 60 180 60 180 60 10 30

( Table 5 : Indoor fan speed )

(SEC)

Dry

X zone J zone

AS*G18LFCA 710rpm 660rpm

Y zone

Cooling

0 270rpm 710rpm

01-05

6. OUTDOOR FAN CONTROL

1. Outdoor Fan Motor

Following table shows the type of the outdoor fan motor. The control method is different
between AC motor and DC motor.

( Table 6 : Type of Motor )

AC Motor DC Motor

AO*G18LFC

2. Fan Speed

( Table 7 : Outdoor fan speed )

ZONE

AO*G18LFC 1050/ 920/ 870/ 720/ 530

Y
Z
F
G

Cooling Dry Heating

870/ 530/ 300

300

250/ 200

530
300

250/ 200

1100/ 870/ 780/
720/ 590/ 480

Refer to Fig.7.

( Fig.7 : Outside air temperature zone selection )

Outside air
temperature

21°C

12°C

2°C

The outdoor fan speed mentioned avobe depends on the compressor frequency.

*

Y zone

Z zone

F zone

G zone

Outside air
temperature

19°C

10°C

0°C

(When the compressor frequency increases, the outdoor fan speed also changes to the higher
speed. When the compressor frequescy decreases, the outdoor fan speed also changes to the
lower speed.)

(rpm)

After the defrost control is operated on the heating mode, the fan speed keeps at the higher speed

*

as table 8 without relating to the compressor frequency.

( Table 8 : Outdoor fan speed after the defrost )

Min

AO*G18LFC

1100rpm

01-06

7. LOUVER CONTROL

1. VERTICAL LOUVER CONTROL

(Function Range)

Each time the button is pressed, the air direction range will change as follow:

Types of Airflow Direction Setting:

,,,,,

: During Heating/ Cooling/ Dry modes

The Remote Controller's display does not change.

1
2

3

4

5

6

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 / Dry mode : Horizontal flow
During Heating mode : Downward flow

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

Direction
Only the direction of the Airflow Direction Louver changes; the direction of the Power Diffuser does not change.
The airflow direction setting will temporarily become when the temperature of

the airflow is low at the start of the Heating mode.
After beginning of AUTO/HEAT mode operated and automatic defrosting operation time,

the air flow will be horizontal .
However, the Airflow Direction cannot be adjusted at beginning AUTO operation mode.

2. HORIZONTAL LOUVER CONTROL

(Function Range)

Each time the button is pressed, the air direction
range will change as follows.

Cooling / Heating / Dry mode / Fan mode

1

3

2

5

4

The Remote Controller's display does not change.

3. SWING OPERATION

To select Vertical Airflow Swing Operation

When the swing signal is received from the remote controller, the vertical louver starts to swing.

(Swinging Range)

Cooling mode / Dry mode / Fan mode( ) :
Heating mode / Fan mode( ) :

4

6

1 3

When the indoor fan is S-Lo or Stop mode, the swing operation is interrupted
and it stops at either upper end or bottom end.

To select Horizontal Airflow Swing Operation

When the swing signal is received from the remote controller, the horizontal louver starts to swing.

(Swinging Range)

All mode :

1

5

When the indoor fan is S-Lo or Stop mode, the swing operation is interrupted
and it stops at either upper end or bottom end.

To select Vertical and Horizontal Airflow Swing Operation

When the horizontal swing signal is input from remote control, the combination of the vertical
and horizontal swing operation is performed.

1

4

36

01-07

8. COMPRESSOR CONTROL

1. OPEARTION FREQUENCY RANGE

The operation frequency of the compressor is different based on the operation mode as
shown in the table 9.

(Table 9 : Compressor Operation Frequency Range)

Cooling Heating

Min Max Min Max Min Max

AO*G18LFC

2. OPEARTION FREQUENCY CONTROL AT NORMAL START UP

The compressor frequency soon after the start-up is controlled as shown in the fig.8.

18rps 113rps 18rps 130rps 20rps 34rps

(Fig.8 : Compressor Control at Start-up)

Frequency

Frequency

Frequency
Frequency

Frequency
Frequency

Time

Time Time Time

Time

Dry

Time

(Frequency)

AO*G18LFC

(Time)

AO*G18LFC

Frequency

40rps 59rps 72rps 85rps 101rps 110rps

Time Time

120sec 180sec 220sec 270sec 350sec 410sec

Frequency

Frequency Frequency

Time Time Time Time

Frequency

Frequency

01-08

9. TIMER OPEARTION CONTROL

9-1 WIRELESS REMOTE CONTROLLER

The table 10 shows the available timer setting based on the product model.

(Table 10 : Timer Setting)

ON TIMER / OFF TIMER PROGRAM TIMER SLEEP TIMER

AS*G18LFCA

1. OPEARTION FREQUENCY RANGE

OFF timer : When the clock reaches the set time, the air conditioner will be turned off.

Operation mode

Stop mode

Set time of timer

ON timer : When the clock reaches the set time, the air conditioner will be turned on.

Operation mode

Stop mode

Set time of timer

2. PROGRAM TIMER

The program timer allows the OFF timer and ON timer to be used in combination one time.

Operation mode

Stop mode

Set time

Operation mode

Stop mode

Set time Set time Set time

Operation mode

Operation will start from the timer setting (either OFF timer or ON timer) whichever is closest
to the clock's current timer setting.
The order of operations is indicated by the arrow in the remote control unit's display.

SLEEP timer operation cannot be combined with ON timer operation.

Stop mode

01-09

3. SLEEP TIMER

If the sleep is set, the room temperature is monitored and the operation is stopped automatically.
If the operation mode or the set temperature is change after the sleep timer is set, the operation is
continued according to the changed setting of the sleep timer from that time ON.

In the cooling operation mode

When the sleep timer is set, the setting temperature is increased 1°C.
It increases the setting temperature another 1°C after 1 hour.
After that, the setting temperature is not changed and the operation is stopped at the time
of timer setting.

Set temperature rises

( Ts : Set temperature )

+2°C
+1°C

Ts

Stop of operation

Set

In the heating operation mode

When the sleep timer is set, the setting temperature is decreased 1°C.
It decreases the setting temperature another 1°C every 30 minutes.
Upon lowering 4°C, the setting temperature is not changed and the operation stops at
the time of timer setting.

Set temperature lowers

( Ts : Set temperature )

Ts

- 1°C

- 2°C

- 3°C

- 4°C

Set

30min

60min

30min

Stop of operation

30min

01-10

9-2 WIRED REMOTE CONTROLLER (OPTION)

The table11 shows the available timer setting based on the product model.

( Table11 : Timer Setting )

ON TIMER / OFF TIMER WEEKLY TIMER TEMPERATURE SET BACK TIMER

AS*G18LFCA

1. ON TIMER / OFF TIMER

Same to 9-1 1.ON TIMER / OFF TIMER and shown in those.

2. WEEKLY TIMER

This timer function can set operation times of the each day of the week.
All days can be set together,the weekly timer can be used to repeat the timer setting for all of the days.

ON OFF ON OFF ON OFF

Setting day Setting day Setting day

Set time Set time

3. TEMPERATURE SET BACK TIMER

This timer function can change setting temperature of setting operation times of the each day of the week.
This can be together with other timer setting.

Set back tmp.

Normal tmp.

ON

Set time Set time

OFF

01-11

10. ELECTRONIC EXPANSION VALVE CONTROL

The most proper opening of the electronic expansion valve is calculated and controlled under the
present operating condition based on the following values.
The compressor frequency, the temperatures detected by the discharge temperature sensor, the
indoor heat exchanger sensor, the outdoor heat exchanger sensor,
and the outdoor temperature sensor.

The pulse range of the electronic expansion valve control is between 60 to 480 pulses.

The expansion valve is set at 480 pulses after 110 seconds of stopping compressor.

At the time of supplying the power to the outdoor unit, the initialization of the electronic
expansion valve is operated (528 pulses are input to the closing direction).

11. TEST OPERATION CONTROL

[ Wireless remote controller ]

Under the condition where the air conditioner runs, press the test run button of the remote control,
and the test operation control mode will appear.
During test running, the operation lamp and timer lamp of the air conditioner body twinkle simultaneously.

[ Wired remote controller (Option) ]

If the operation lamp is on, press the Start/Stop button to turn it off.
Press the Master Control and Fan Control buttons at the same time for more than two seconds
to start the test operation.
The operation lamp will light up and "o1" will be displayed on the set temperature display.

[ Release ]

Perform the test operation for 60 minutes.
Pressing the Start/Stop button will stop the test operation.

12. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )

The compressor won't enter operation status for 3 minutes after the compressor is stopped,
even if any operation is given.

13. FOUR-WAY VALVE EXTENSION SELECT

At the time when the air conditioner is switched from the cooling mode to heating mode,
the compressor is stopped, and the four-way valve is switched in 3 minutes later after
the compressor stopped.

01-12

14. AUTO RESTART

When the power was interrupted by a power failure, etc. during operation, the operation contents
at that time are memorized and when power is recovered, operation is automatically started with
the memorized operation contents.
When the power is interrupted and recovered during timer operation, since the timer operation time
is shifted by the time the power was interrupted, an alarm is given by blinking (7 sec ON/2 sec OFF)
the indoor unit body timer lamp.

[Operation contents memorized when the power is interrupted]

Operation mode
Set temperature
Set air flow
Timer mode and timer time
Set air flow Direction
Swing
ECONOMY opeartion

15. MANUAL AUTO OPERATION (Indoor unit body operation)

If MANUAL AUTO Button is set, the operation is controlled as shown in Table 12.
If the remote control is lost or battery power dissipated, this function will work without the remote control.

(Table 12)

Manual auto operation
OPERATION MODE Auto changeover
FAN CONT. MODE Auto
TIMER MODE Continuous
SETTING TEMP. 24°C
SETTING LOUVER Standard
SWING OFF

(No timer setting available)

16. FORCED COOLING OPERATION

If cooling operation is set, the operation is controlled as shown in Table13.

( Table13 )

Forced cooling operation
OPERATION MODE
FAN CONT. MODE
TIMER MODE
SETTING TEMP.
SETTING LOUVER

SWING

Forced cooling operation is started when pressing MANUAL AUTO button for 10 seconds or more.
During the forced cooling operation, it operates regardless of room temperature sensor.
Operation LED and timer LED blink during the forced cooling operation. They blink for 1 second ON
and 1 second OFF on both operation LED and timer LED (same as test operation).
Forced cooling operation is released after 60 minutes of starting operation.
The FORCED COOLING OPERATION will start as shown in Table13.

Cooling
Hi

-

Room Temp is not controlled

Initial : Horizontal
(It is changed follow as setting of remote controller)

OFF

01-13

17. COMPRESSOR PREHEATING

When the outdoor heat exchanger temperature is lower than 5°C and the heating operation has
been stopped for 30 minutes, power is applied to the compressor and the compressor is heated.
(By heating the compressor, warm air is quickly discharged when operation is started.)
When operation was started, and when the outdoor temperature rises to 7°C or greater,
preheating is ended.

( Fig.9 : Compressor Preheating )

OFF

7°C

5°C

ON

18. 10°C HEAT OPERATION

The 10°C HEAT operation functions by pressing 10°C HEAT button on the remote controller.
The 10°C HEAT operation is almost the same operation as below settings.

( Table14 )

Mode Heating
Setting temperature 10°C
Fan mode AUTO

19. ECONOMY OPERATION

The ECONOMY operation functions by pressing ECONOMY button on the remote controller.
The ECONOMY operation is almost the same operation as below settings.

( Table15 )

Mode Cooling/ Dry Heating
Target temperature Setting temp.+1°C Setting temp.-1°C

01-14

20. DEFROST OPERATION CONTROL

1. CONDITION OF STARTING THE DEFROST OPERATION

The defrost operation starts when the outdoor heat exchanger temperature sensor (Tn) detects
the temperature lower than the values shown in Table16.

( Table 16 : Condition of starting Defrost Operation )

Normal defrost

Tn10 : Temperature of continuous operation at 10minutes.
Tnb : Back 5minutes temperature
Ta : Outside air temperature

Integrating defrost
(Constant monitoring)

*1 : If the compressor continuous operation time is less than 10 minutes and outdoor air temperature is less than 2°C
once while operating the compressor, the OFF number of the compressor is counted.
If any defrost operated, the compressor OFF count is cleared.

Compressor integrating operation time

Less than 25 min. More than 25min.

Does not operate

More than 240 min.
(For long continuous operation)

- 3°C

Tn-Tn10< - 5deg, Tn < - 6°C
Tn-Tnb < - 2deg, Tn < - 6°C
Tn < - 17°C, Ta > - 10°C

=

Tn-Ta < - 7deg, Ta < - 10°C

=

Tn < - 20°C

=

Compressor integrating operation time

=

More than 213 min.
(For long continuous operation)

=
=

- 5°C

2. CONDITION OF THE DEFROST OPERATION COMPLETION

Defrost operation is released when the conditions become as shown in Table17.

Less than 10min.*1
(For intermittent operation)

OFF count of the compressor
40 times.

( Table17 : Defrost Release Condition )

Release Condition

Outdoor heat exchanger temperature sensor value is higher than +16°C
or
Compressor operation time has passed 15 minutes.

01-15

Defrost Flow Chart

The defrosting shall proceed by the integrating operation time, outdoor temperature
and outdoor heat exchanger temperature as follows.

Heating operation start : Compressor ON

(Not defrosted for 10 minutes)

Tn-Tn10< -5deg
Tn < -6°C

=

Tn-Tnb< -2deg
Tn < -6°C

=

Tn < -17°C

=

Ta > -10°C

=

Normal defrost

Compressor
integrating
operation:
Over 25 min.

Tn-Ta < -7deg

=

Ta < -10°C

Defrost start

Tn < -20°C

=

Integrating defrost

(Constant monitoring)

Compressor
OFF count :
40 times
(Less than 10min.)

Compressor
integrating
operation:
Over 240 min.

Outdoor
heat exchanger
temperature:
Below - 3°C

Compressor
integrating
operation:
Over 213 min.

Outdoor
heat exchanger
temperature:
Below - 5°C

Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec O FF

Compressor OFF
Outdoor fan motor OFF
50 sec later four - way valve OFF
55 sec later compressor ON

Outdoor heat exchanger temperature:

Over +16°C

or

Compressor ON time: Maximum 15 minutes

Defrost end

01-16

21. OFF DEFROST OPEARTION CONTROL

When operation stops in the [Heating operation] mode, if frost is adhered to the outdoor unit heat
exchanger, the defrost operation will proceed automatically. In this time, if indoor unit operation
lamp flashes slowly (7 sec ON / 2 sec OFF), the outdoor unit will allow the heat exchanger to defrost,
and then stop.

1. OFF DEFROST OPERATION CONDITION

In heating operation, the outdoor heat exchanger temperature is less than - 4°C,
compressor continuous operation more than 10 minutes, and
compressor operation integrating time lasts for more than 30 minutes.

2. OFF DEFROST END CONDITION

Release Condition

Outdoor heat exchanger temperature sensor value is higher than 16°C or
Compressor operation time has passed 15 minutes.

OFF Defrost Flow Chart

Heating operation stop

Outdoor heat exchanger temperature :
Below - 4°C
Compressor continuous operation :
Over 10 minutes
Compressor integrating operation :
Over 30 minutes

Defrost start

Defrost Indicater:
[Operation lamp]
7 sec ON / 2 sec OFF

Outdoor heat exchanger temperature:
Over 16°C or
Compressor ON time: Over 15 minutes

Defrost end

01-17

22. VARIOUS PROTECTIONS

1. DISCHARGE GAS TEMPERATURE OVERRISE PREVENSION CONTROL

The discharge gas thermosensor (discharge thermistor : Outdoor side) will detect discharge gas
temperature.

When the discharge temperature becomes higher than Temperature , the compressor frequency
is decreased 20rps, and it continues to decrease the frequency for 20rps every 120 seconds until
the temperature becomes lower than Temperature .

When the discharge temperature becomes lower than Temperature , the control of the control of the
compressor frequency is released.

When the discharge temperature becomes higher than Temperature , the compressor is stopped
and the indoor unit LED starts blinking.

(Table 18 : Discharge Temperature Over Rise Prevension Control / Release Temperature)

Condition

Temperature

Temperature

104°C 101°C 110°C

AO*G18LFC

Ta' + 74°C Ta' + 71°C 110°C

Condition : - Cooling operation ­ Outdoor temperature Y, Z zone

or
Outdoor temperaturee F, G zone and the compressor operation time is less than 20 minutes.

- Heating operation-

Temperature

Ta': Outdoor temperature

Condition : - Cooling operation ­ Outdoor temperaturee F, G zone and the compressor operation time is more than 20 minutes.

2. CURRENT RELEASE CONTROL

The compressor frequency is controlled so that the outdoor unit input current does not exceeds
the current limit velue that was set up with the outdoor temperature.
The compressor frequency returns to the designated frequency of the indoor unit at the time
when the frequency becomes lower than the release value.

(Table 19 : Current Release Operation Value / Release Value)

[ Heating ]

AO*G18LFC

OT (Control / Release)

7.0A/ 6.5A

17°C

9.0A/ 8.5A

12°C

10.5A/ 10.0A

5°C

12.0A/ 11.5A

OT : Outdoor Temperature

[ Cooling ]

AO*G18LFC

OT (Control / Release)

4.5A/ 4.0A

46°C

6.0A/ 5.5A

40°C

8.5A/ 8.0A

OT : Outdoor Temperature

3. ANTIFREEZING CONTROL (Cooling and Dry mode)

The compressor frequency is decrease on cooling & dry mode when the indoor heat exchanger
temperature sensor detects the temperature lower than Temperature .
Then, the anti-freezing control is released when it becomes higher than Temperature .

(Table 20 : Anti-freezing Protection Operation / Release Temperature)

Outdoor temperature

Over than 10°C

*2

or 12°C *1

Less than 10°C *2

or 12°C

*1

Temperature Temperature

7°C

4°C

13°C

*1. When the temperature rises.
*2. When the temperature drops.

01-18

4. COOLING PRESSURE OVERRISE PROTECTION

When the outdoor unit heat exchange sensor temperature rises to 67°C or greater,
the compressor is stopped and trouble display is performed.

5. HIGH TEMPERATURE RELEASE CONTROL ( HEATING MODE )

On heating mode, the compressor frequency is controlled as following based on the
detection value of the indoor heat exchanger temperature sensor.

[ Control System ]

Indoor heat exchange
temperature

Compressor is stopped

63°C

The compressor frequency is
decreased 25rps every 120seconds.

55°C

The compressor frequency is
decreased 4rps every 120seconds.

53°C

Stable zone

50°C

It returns to the normal operation

01-19

WALL MOUNTED type

R410A

INVERTER

2 . TROUBLE SHOOTING

2. TROUBLESHOOTING

2-1 ERROR DISPLAY

2-1-1 INDOOR UNIT AND WIRED REMOTE CONTROLLER DISPLAY

Please refer the flashing pattern as follows.
The OPERATION,TIMER,ECONOMY lamps operate as follows according to the error contents.

Error Contents

Serial Communication Error
Wired Remote Controller

Communication Error
Indoor Unit Model Information Error

EEPROM Access Abnormal
Manual Auto Switch Error

Indoor Room Thermistor Error

Indoor Heat Ex. Thermistor Error

Indoor Unit Fan Motor Error

Outdoor Unit Main PCB Error

PFC Circuit Error

IPM Error

OPERATION
(Green)

3 times

3 times

4 times

6 times

Indoor Unit Display

TIMER
(Orange)

5 times

1 times

2 times6 times

4 times

5 times6 times

ECONOMY
(Green)

Continuous1 times1 times

Continuous2 times1 times

Continuous2 times

Continuous

Continuous

Continuous4 times 2 times

Continuous1 times5 times

Continuous

Continuous

Continuous

Wired Remote
Controller
Display

11

12

32

35

41

42

51

62

64

65

Trouble
shooting

1

2

3

4

5

6

7

8

9

10

Discharge Thermistor Error
Heat Ex. Liquid Outlet

Thermistor Error
Outdoor Thermistor Error

Current Sensor Error

Over Current Error

Compressor Control Error

Outdoor Unit Fan Motor Error

4 Way Valve Error

Discharge Temp. Error

7 times

7 times 3 times

7 times 4 times

9 times

9 times

9 times 9 times

1 times

4 times9 times

5 times

7 times

1 times10 times

Continuous

Continuous

Continuous

Continuous8 times 4 times

Continuous

Continuous

Continuous

Continuous

Continuous

71

73

74

84

94

95

97

99

A1

11

12

13

14

15

16

17

18

19

02-01

2-1-2 WIRED REMOTE CONTROLLER DISPLAY (OPTION)

1. SELF - DIAGNOSIS

When " Er " in Temperature Display is displayed, inspection of the air conditioning system is necessary.
Please consult authoilzed servise personnel.

Unit number (usually 0)

Error code

SUMOTU WETH FR SA

ex. Self-diagnosis check

2. ERROR CODE HISTORY DISPLAY

Up to 16 memorized error codes may be displayed for the indoor unit connected to the remote controller.

1. Stop the air conditioner operation.

2. Press the SET TEMPERATURE buttons , simultaneously for 3 seconds
or more to start the self-diagnosis.

Error code

Error history number

SU MO TU WETH FR SA

3. Press the SET TEMPERATURE button to select the error history number.

Lower

01234567

FEdcbA98

Raise

ı

ı

4. Press the SET TEMPERATURE buttons , simultaneously for 3 seconds or more
or there is no key input for 60 seconds to stop the display.

02-02

2-2 TROUBLE SHOOTING WITH ERROR CODE

Trouble shooting 1-1

Indicate or Display:

OUTDOOR UNIT Error Method:

Serial Communication Error

Refer to error code table.

(Serial Reverse Transfer Error)

Detective Actuators:

Outdoor unit Main PCB
Outdoor unit Fan motor

Detective details:

When the indoor unit cannot receive the serial signal from Outdoor unit
more than 2minutes after power ON, or the indoor unit cannot receive
the serial signal more than 15seconds during normal operation.

Forecast of Cause:

1. Connection failure 2. External cause 3. Main PCB failure 4. Outdoor unit Fan motor failure

Check Point 1-1 : Reset the power and operate

Does Error indication show again?

YESYES

Check Point 2 : Check Connection

Check any loose or removed connection line of
Indoor unit and Outdoor unit.

>> If there is an abnormal condition, correct it by
referring to Installation Manual or Data &
Technical Manual.

NO

Check Point 1-2: Check external 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).

OK

Check Point 3 : Check the voltage of power supply

Check the voltage of power supply

>> Check if AC198V (AC220V -10%) - 264V (AC240V +10%) appears
at Outdoor Unit Terminal L - N.

OK

Check Point 4 : Check Serial Signal (Reverse Transfer Signal)

Check Serial Signal (Reverse Transfer Signal)

>> Check if Indicated value swings between AC70V and AC130V at Outdoor Unit Terminal 1 - 3.
>> If it is abnormal, Check Outdoor unit fan motor. (PARTS INFORMATION 5)
>> If Outdoor fan motor is abnormal, replace Outdoor unit fan motor and Main PCB.
>> If Outdoor fan motor is normal, replace Main PCB.

GREEN
WHITE
BLACK
RED
WHITE
BLACK

N
L
3
2

+

-

1

02-03

Trouble shooting 1-2

INDOOR UNIT Error Method:

Serial Communication Error
(Serial Forward Transfer Error)

Indicate or Display:

Refer to error code table.

Detective Actuators:

Indoor unit Controller PCB
Indoor unit Fan motor

Detective details:

When the outdoor unit cannot receive the serial signal from Indoor unit
more than 10seconds.

Forecast of Cause:

1. Connection failure 2. External cause 3. Controller PCB failure 4. Indoor unit Fan motor failure

Check Point 1-1 : Reset the power and operate

Does Error indication show again?

YESYES

Check Point 2 : Check Connection

Check any loose or removed connection line of
Indoor unit and Outdoor unit.

>> If there is an abnormal condition, correct it by
referring to Installation Manual or Data &
Technical Manual.

OK

NO

Check Point 1-2: Check external 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 3 : Check the voltage of power supply

Check the voltage of power supply

>> Check if AC198V (AC220V -10%) - 264V (AC240V +10%) appears
at Outdoor Unit Terminal L - N.

OK

Check Point 4 : Check Serial Signal (Reverse Transfer Signal)

Check Serial Signal (Forward Transfer Signal)

>> Check if Indicated value swings between AC70V and AC130V at Outdoor Unit Terminal 2 - 3.
>> If it is abnormal, replace Controller PCB.
>> If it is abnormal, Check Indoor unit fan motor. (PARTS INFORMATION 4)
>> If Indoor unit fan motor is abnormal, replace Indoor unit fan motor and Controller PCB.

GREEN
WHITE
BLACK
RED
WHITE
BLACK

N
L
3

+

­2
1

02-04

Trouble shooting 2
INDOOR UNIT Error Method:

Wired Remote Controller
Communication Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Indoor unit Controller PCB
Wired Remote Control

Detective details:

When the indoor unit cannot receive the signal from Wired Remote Control
more than 1minute during normal operation.

Forecast of Cause:

1. Terminal connection abnormal 2. Wired Remote Control failure 3. Controller PCB failure

Check Point 1 : Check the connection of terminal

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

Check the connection of terminal between remote control and Indoor unit,
and check if there is a disconnection of the cable.

OKOK

Check Point 2 : Check Remote Control and Controller PCB

Check Voltage at CN6 (terminal 1-3).
(Power supply to Remote Control)

>> If it is DC12V, Remote Control is failure. (Controller PCB is normal) >> Replace Remote Control
>> If it is DC 0V, Controller PCB is failure. (Check Remote Control once again) >> Replace Controller PCB

Upon correcting the removed connector or mis-wiring, reset the power.

02-05

Trouble shooting 3

INDOOR UNIT Error Method:

Indoor Unit Model Information Error
EEPROM Access Abnormal

Indicate or Display:

Refer to error code table.

Detective Actuators:

Indoor unit Controller PCB

Detective details:

When power is on and there is some below case.

1. When model information of EEPROM is incorrect.

2. When the access to EEPROM failed.

Forecast of Cause:

1. External cause 2. Defective connection of electric components 3. Controller PCB failure

Check Point 1-1 : Reset Power Supply and operate

Does Error indication show again?

YESYES

Check Point 2 :
Check Indoor unit electric components

Check all connectors.
(loose connector or incorrect wiring)

Check any shortage or corrosion on PCB.

NO

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

Check if the ground connection is proper.
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 3 : Replace Controller PCB

Change Controller PCB.

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.

02-06

Trouble shooting 4
INDOOR UNIT Error Method:

INDOOR UNIT

Manual Auto Switch Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Indoor unit Controller PCB
Indicator PCB

Detective details:

When the Manual Auto Switch becomes ON for consecutive 60 or
more seconds.

Manual auto switch

Forecast of Cause :

1. Manual auto switch failure 2.Controller PCB and Indicator PCB failure

Check Point 1 : Check the Manual auto switch

Check if Manual auto switch is kept pressed.
Check ON/OFF switching operation by using a meter.

>>If Manual Auto Switch is disabled (on/off switching), replace it.

OKOK

Check Point 2 : Replace Controller PCB

If Check Point 1 do not improve the symptom, change Controller PCB and Indicator PCB.

02-07

Trouble shooting 5
INDOOR UNIT Error Method:

INDOOR UNIT

Indoor Room Thermistor Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Indoor unit Controller PCB

Detective details:

When Room Temperature Thermistor open or short-circuit is detected.

Room Temperature Thermistor

Forecast of Cause :

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

Check Point 1 : Check connection of Connector

Check if connector is removed.

Check erroneous connection.
Check if thermistor cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

OK

Check Point 2 : Check Point 2 : Remove connector and check Thermistor resistance value

Thermistor Characteristics (Approx. value)

Temperature

25°C 20°C15°C10°C5°C0°C-5°C-10°C

10.012.515.820.225.933.644.058.2Resistance Value (k )

Temperature

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

40°C

5.36.58.0Resistance Value (k )

45°C35°C30°C

4.4

OK

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

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

BLACK
BLACK

THERMISTOR
(ROOM TEMP.)

If the voltage does not appear, replace Controller PCB.

212

1

CN1

02-08

Trouble shooting 6
INDOOR UNIT Error Method:

INDOOR UNIT

Indoor Heat Ex. Thermistor Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Indoor unit Controller PCB

Detective details:

When Heat Ex. Temperature Thermistor open or short-circuit is detected.

Heat Ex. temperature thermistor

Forecast of Cause :

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

Check Point 1 : Check connection of Connector

Check if connector is removed.

Check erroneous connection.
Check if thermistor cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

OKOK

Check Point 2 :

Check Point 2 : Remove connector and check Thermistor resistance value

Thermistor Characteristics (Approx. value)

Temperature

20°C10°C5°C0°C-5°C-10°C-20°C-30°C

62.9103.3134.2176.0233.2312.3579. 1131.9Resistance Value (k )

Temperature

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

50°C

17.125.639.6Resistance Value (k )

60°C

11.6

63°C40°C30°C

10.4

OK

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

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

THERMISTOR

3
2
1

(PIPE)

3
2
1

WHITE
RED

212

1

CN3

BLACK
BLACK

If the voltage does not appear, replace Controller PCB.

02-09

Trouble shooting 7

INDOOR UNIT Error Method:

Indoor Unit Fan Motor Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Indoor unit Controller PCB
Indoor unit fan motor

Detective details:

When the condition that actual frequency of Indoor Fan is
below 1/3 of target frequency is continued more than 56 seconds.

Forecast of Cause:

1. Fan rotation failure 2. Fan motor winding open 3. Motor protection by surrounding temperature rise

4. Control PCB failure 5. Indoor unit fan motor failure

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.

OK

Check Point 2 : 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.

OK

Check Point 3 : Check Indoor unit fan motor

Check Indoor unit fan motor. (PARTS INFORMATION 4)

>>If Indoor unit fan motor is abnormal, replace Indoor unit fan motor.

OK

Check Point 4 : Replace Controller PCB

If Check Point 1- 3 do not improve the symptom, replace Controller PCB.

02-10

Trouble shooting 8

OUTDOOR UNIT Error Method:

Outdoor Unit Main PCB Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB

Detective details:

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

Forecast of Cause:

1. External cause (Noise, temporary open, voltage drop) 2. Main PCB failure

Check Point 1-1 : Reset Power Supply and operate

Does Error indication show again?

YESYES

Check Point 2 : Replace Main PCB

Change Main PCB.

NO

Check Point 1-2 : Check external cause

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.

02-11

Trouble shooting 9
OUTDOOR UNIT Error Method:

INDOOR UNIT

PFC Circuit Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB

Detective details:

When inverter output DC voltage is higher than 415V for over 3 seconds,
the compressor stops.
If the same operation is repeated 5 times, the compressor stops permanently.

Forecast of Cause :

1. External cause 2. Connector connection failure 3. Main PCB failure

Check Point 1 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)

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.

OKOK

Check Point 2 : Check connection of Connector

Check if connector is removed.
Check erroneous connection.
Check if cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

OKOK

Check Point 3 : Replace Main PCB

If Check Point 1, 2 do not improve the symptom, change Main PCB.

02-12

Trouble shooting 10

OUTDOOR UNIT Error Method:

IPM Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB
Compressor

Detective details:

When more than normal operating current to IPM in Main PCB flows,
the compressor stops.
After the compressor restarts, if the same operation is repeated within 40sec,
the compressor stops again.
If and repeats 5 times, the compressor stops permanently.

Forecast of Cause :

1. Defective connection of electric components 2. Outdoor Fan Operation failure

3. Outdoor Heat Exchanger clogged 4. Compressor failure 5. Main PCB failure

Check Point 1 : Check connections of Outdoor Unit Electrical Components

Check if the terminal connection is loose.
Check if connector is removed.
Check erroneous connection.
Check if cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

OK

Check Point 2 : Check Outdoor Fan, Heat Exchanger

Is there anything obstructing the air distribution circuit?
Is there any clogging of Outdoor Heat Exchanger?
Is the Fan rotating by hand when operation is off ?

>> If the Fan Motor is locked, replace it.

OK

Check Point 3 : Check Outdoor Fan

Check Outdoor Fan Motor. (Refer to Trouble shooting 17)

>> If the Fan Motor is failure, replace it.

OKOK

Check Point 4 : Check Compressor

Check Compressor.

(PARTS INFORMATION 2)

OKOK

Check Point 5 : Replace Main PCB

If Check Point 1 4 do not improve the symptom, change Main PCB.

02-13

Trouble shooting 11
OUTDOOR UNIT Error Method:

INDOOR UNIT

Discharge Thermistor Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB
Discharge pipe temperature thermistor

Detective details:

When Discharge pipe temperature thermistor open or short-circuit
is detected at power ON or while running the compressor.

Forecast of Cause :

1. Connector connection failure 2.Thermistor failure 3. Main PCB failure

Check Point 1 : Check connection of Connector

Check if connector is removed.

Check erroneous connection.
Check if thermistor cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

OKOK

Check Point 2 :

Check Point 2 : Remove connector and check Thermistor resistance value

Thermistor Characteristics (Approx. value)

Temperature

5°C0°C-5°C-10°C-20°C-30°C

20°C10°C

62.5100.9129.8168.6221.1292.9531.61013.1Resistance Value (k )

30°C

40.0

Temperature

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

40°C

26.3

50°C

17.8

60°C

12.3

90°C80°C70°C

100°C

110°C

2.6

OKOK

Check Point 3 :

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

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

THERMISTOR
(PIPE)

THERMISTOR
(DISCHARGE)

THERMISTOR
(OUTDOOR)

BLACK

BLACK
BROWN
BROWN

BLACK

BLACK

1

1

2

2

CN71

3

3

4

4

1

1

2

2

CN70

3

3

120°C

2.03.44.66.38.7Resistance Value (k )

If the voltage does not appear, replace Main PCB.

02-14

Trouble shooting 12
OUTDOOR UNIT Error Method:

Heat Ex. Liquid Outlet
Thermistor Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB
Heat exchanger temperature thermistor

Detective details:

When Heat exchanger temperature thermistor open or
short-circuit is detected at power ON or while running the compressor.

Forecast of Cause :

1. Connector connection failure 2.Thermistor failure 3. Main PCB failure

Check Point 1 : Check connection of Connector

Check if connector is removed.

Check erroneous connection.
Check if thermistor cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

OKOK

Check Point 2 :

Check Point 2 : Remove connector and check Thermistor resistance value

Thermistor Characteristics (Approx. value)

Temperature

-30°C

95.6

-20°C

50.3

-5°C-10°C

30°C20°C10°C5°C0°C

6.09.612.416.121.027.8Resistance Value (k )

3.8

Temperature

50°C40°C

80°C70°C60°C

0.60.81.21.72.5Resistance Value (k )

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

OKOK

Check Point 3 :

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

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

THERMISTOR
(PIPE)

THERMISTOR
(DISCHARGE)

THERMISTOR
(OUTDOOR)

BLACK

BLACK
BROWN
BROWN

BLACK

BLACK

1

1

2

2

CN71

3

3

4

4

1

1

2

2

CN70

3

3

If the voltage does not appear, replace Main PCB.

02-15

Trouble shooting 13
OUTDOOR UNIT Error Method:

Outdoor Thermistor Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB
Outdoor temperature thermistor

Detective details:

When Outdoor temperature thermistor open or short-circuit is
detected at power ON or while running the compressor.

Forecast of Cause :

1. Connector connection failure 2.Thermistor failure 3. Main PCB failure

Check Point 1 : Check connection of Connector

Check if connector is removed.

Check erroneous connection.
Check if thermistor cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

OKOK

Check Point 2 :

Check Point 2 : Remove connector and check Thermistor resistance value

Thermistor Characteristics (Approx. value)

Temperature

-30°C

224.3

-25°C

159.7

-15°C-20°C

10°C5°C0°C-5°C-10°C

26.935.246.662.384.2115.2Resistance Value (k )

20.7

Temperature

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

20°C15°C

35°C

6.48.010.012.616.1Resistance Value (k )

40°C

5.2

45°C

4.2

50°C

3.5

OKOK

Check Point 3 :

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

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

THERMISTOR
(PIPE)

THERMISTOR
(DISCHARGE)

THERMISTOR
(OUTDOOR)

BLACK

BLACK
BROWN
BROWN

BLACK

BLACK

1

1

2

2

CN71

3

3

4

4

1

1

2

2

CN70

3

3

55°C30°C25°C

2.8

If the voltage does not appear, replace Main PCB.

02-16

Trouble shooting 14

OUTDOOR UNIT Error Method:

Current Sensor Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB

Detective details:

When Input Current Sensor has detected 0A, while Inverter Compressor is
operating at higher than 56rps, after 1minute upon starting the Compressor.
(Except during the defrost operation)

Forecast of Cause :

1. Defective connection of electric components 2. External cause 3. Main PCB failure

Check Point 1-1 : Reset Power Supply and operate

Does Error indication show again?

NO

YES

Check Point 2 :
Check connections of Outdoor Unit Electrical Components

Check if the terminal connection is loose.
Check if connector is removed.
Check erroneous connection.
Check if cable is open.

>>Upon correcting the removed connector or mis-wiring,
reset the power.

OK

Check Point 1-2 :
Check external cause at Indoor and Outdoor
(Voltage drop or Noise)

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 Main PCB

If Check Point 1, 2 do not improve the symptom, change Main PCB.

02-17

Trouble shooting 15

OUTDOOR UNIT Error Method:
Over Current Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB
Compressor

Forecast of Cause :

1. Outdoor unit fan operation defective, foreign matter on hear exchanger,

Detective details:

"Protection stop by overcurrent generation after inverter compressor start
processing completed'' generated consecutively 10 times.
* The number of generations is reset if the start-up of
the compressor succeeds.

excessive rise of ambient temperature

2. Inverter PCB failure

3. Inverter compressor failure (lock, winding short)

Check Point 1 : Check the outdoor unit fan operation, heat exchanger, ambient temperature

No obstructions in air passages?
Heat exchange fins clogged
Outdoor unit fan motor check
Ambient temperature not raised by the effect of other heat sources?
Discharged air not sucked in?

OKOK

Check Point 2: Replace Main PCB

If Check Point 1 do not improve the symptom, change Main PCB.

OKOK

Check Point 3: Replace Compressor

If Check Point 2 do not improve the symptom, change Compressor.

02-18

Trouble shooting 16

OUTDOOR UNIT Error Method:
Compressor Control Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB
Compressor

Detective details:

If the detected rotor location is out of phase with actual rotor location
more than 105°(at start-up) and 120°(in operation),
the compressor stops.
After the compressor restarts, if the same operation is repeated
within 40sec, the compressor stops again.
If and repeats 5 times, the compressor stops permanently.

Forecast of Cause :

1. Defective connection of electric components 2. Main PCB failure 3. Compressor failure

Check Point 1 : Check Noise from Compressor

Turn on Power and check operation noise.

If an abnormal noise show, replace Compressor.

OKOK

Check Point 2 : Check connection of around the Compressor components

For Compressor Terminal, Main PCB

Check if connector is removed.

Check erroneous connection.
Check if cable is open.

(Refer to PARTS INFORMATION 2)

>>Upon correcting the removed connector or mis-wiring, reset the power.

OKOK

Check Point 3: Replace Main PCB

If Check Point 1,2 do not improve the symptom, change Main PCB.

OKOK

Check Point 4: Replace Compressor

If Check Point 3 do not improve the symptom, change Compressor.

02-19

Trouble shooting 17

OUTDOOR UNIT Error Method:

Outdoor Unit Fan Motor Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB
Outdoor unit fan motor

Detective details:

When outdoor fan rotation speed is less than 100rpm in 20 seconds
after fan motor starts, fan motor stops.
After fan motor restarts, if the same operation within 60sec is repeated
3 times in a row, compressor and fan motor stops.
If and repeats 5 times in a row, compressor and fan motor stops
permanently.

Forecast of Cause:

1. Fan rotation failure 2. Motor protection by surrounding temperature rise 3. Main PCB failure

4. Outdoor unit fan motor

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.

OK

Check Point 2 : 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.

OK

Check Point 3 : Check Outdoor unit fan motor

Check Outdoor unit fan motor. (PARTS INFORMATION 5)

>>If Outdoor unit fan motor is abnormal, replace Outdoor unit fan motor.

OK

Check Point 4 : Check Output Voltage of Main PCB

Check outdoor unit circuit diagram and the voltage. (Measure at Main PCB side connector)

RED

1
2
3

CN800

If the voltage is not correct, replace Main PCB.

4
5
6
7

BLACK
WHITE
YELLOW
BROWN

FAN MOTOR

FM

Read wire DC voltage

Red - Black

White - Black

240 - 400V

15 1.5V

02-20

Trouble shooting 18
INDOOR UNIT Error Method:

4-Way Valve Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Indoor unit Controller PCB
Heat Ex. temperature thermistor
Room temperature thermistor
4-way valve

Detective details:

When the indoor heat exchanger temperature is compared with
the room temperature, and either following condition is detected
continuously two times, the compressor stops.

Cooling or Dry operation
[Indoor heat exchanger temp.] - [Room temp.] > 20degC

Heating operation
[Indoor heat exchanger temp.] - [room temp.] < - 20degC

If the same operation is repeated 5 times,
the compressor stops permanently.

Forecast of Cause :

1. Connector connection failure 2. Thermistor failure 3. Coil failure 4. 4-way valve failure

5. Controller PCB failure

Check Point 1 : Check connection of Connector

Check if connector is removed.

Check erroneous connection.
Check if thermistor cable is open.

>> Upon correcting the removed connector or mis-wiring, reset the power.

OKOK

Check Point 2 : Check each thermistor

Isn’t it fallen off the holder?
Is there a cable pinched?

>> Check characteristics of thermistor (Refer to Trouble shooting 5, 6),
If defective, replace the thermistor

OKOK

Check Point 3 : Check the solenoid coil and 4-way valve

[ Solenoid coil ]

Remove CN30 from PCB and check the resistance value of coil.
Resistance value is 1.22k 1.49k (at 20°C).

>> If it is Open or abnormal resistance value, replace Solenoid Coil.

[ 4-way valve ]

Check each piping temperature,
and the location of the valve by the temperature difference.

>> If the value location is not proper, replace 4-way valve.

OKOK

Check Point 4 : Replace Controller PCB

If Check Point 1- 3 do not improve the symptom, replace Controller PCB.

02-21

Trouble shooting 19
OUTDOOR UNIT Error Method:

INDOOR UNIT

Discharge Temp. Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Detective details:

Outdoor unit Main PCB
Discharge temperature thermistor

Forecast of Cause :

1. 3-way valve not opened 2. EEV defective, strainer clogged

3. Outdoor unit operation failure, foreign matter on heat exchanger

4. Discharge temperature thermistor failure 5. Insufficient refrigerant

6. Main PCB failure

<Cooling operation>

Check Point 1 : Check if 3-way valve(gas side) is open.

If the 3-way valve(gas side) was closed, open the
3-way valve(gas side) and check operation.

OK

Check Point 2 : Check the EEV, strainer

EEV (EEV2, indoor unit EEV) open?
Strainer clogging check (before and after EEV, ACM

oil return)
Refer to "Service Parts Information 3".

"Protection stop by "discharge temperature 110degC during compressor
operation"" generated 2 times within 24 hours.

<Heating operation>

Check Point 1 : Check if 3-way valve(liquid side) is open.

If the 3-way valve(liquid side) was closed, open the
3-way valve(liquid side) and check operation.

OK

Check Point 2 : Check the EEV, strainer

EEV (EEV1, EEV2) open?
Strainer clogging check (before and after EEV, ACM

oil return)
Refer to "Service Parts Information 3".

OK

Check Point 3 : Check the outdoor unit fan,heat exchanger

Check for foreign object at heat exchanger
Check if fan can be rotated by hand.
Motor check (PARTS INFORMATION 5)

OK

Check Point 4 : Check the discharge thermistor

Discharger thermistor characteristics check.
(Check by disconnecting thermistor from PCB.)

* For the characteristics of the thermistor, refer to the "Trouble shooting 11".

OK

Check Point 5 : Check the refrigerant amount

Leak check

OK

02-22

2-3 TROUBLE SHOOTING WITH NO ERROR CODE

Trouble shooting 20

Forecast of Cause:

1. Power Supply failure 2. External cause

Indoor Unit - No Power

3. Electrical Components defective

Check Point 1 : Check Installation Condition

Isn’t the breaker down?

Check loose or removed connection cable.

>>If abnormal condition is found, correct it by referring
to Installation Manual or Data & Technical Manual.

OKOK

Check Point 2 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)

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.

OK

Check Point 3 : Check Electrical Components

Check the voltage of power supply.

>> Check if AC198 - 264V appears at Outdoor Unit Terminal L - N.

YESYES

Check Fuse in Main PCB.

>> If Fuse is open, check if the wiring between Terminal and Main PCB
is loose, and replace Fuse.

Check Varistor in Main PCB.

>> If Varistor is defective, there is a possibility of an abnormal power supply.
Check the correct power supply and replace Varistor.
Upon checking the normal power supply, replace Varistor.

02-23

Trouble shooting 21

Outdoor Unit - No Power

Forecast of Cause:

1. Power Supply failure 2. External cause

3. Electrical Components defective

Check Point 1 : Check Installation Condition

Isn’t the breaker down?

Check loose or removed connection cable.

>>If abnormal condition is found, correct it by referring
to Installation Manual or Data & Technical Manual.

OKOK

Check Point 2 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)

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.

OKOK

Check Point 3 : Check Electrical Components

Check the voltage of power supply.

>> Check if AC198 - 264V appears at Outdoor Unit Terminal L - N.

YESYES

Check Fuse in Main PCB.

>> If Fuse is open, check if the wiring between Terminal and Main PCB is loose,
and replace Fuse.

Check Varistor in Main PCB.

>> If Varistor is defective, there is a possibility of an abnormal power supply.
Check the correct power supply and replace Varistor.
Upon checking the normal power supply, replace Varistor.

OK

If the symptom does not change by above Check 3, replace Main PCB.

02-24

Trouble shooting 22

Forecast of Cause:

1. Setting/ Connection failure 2. External cause

No Operation (Power is ON)

3. Electrical Component defective

Check Point 1 : Check indoor and outdoor installation condition

Indoor Unit - Check incorrect wiring between Indoor Unit - Remote Control.
Or, check if there is an open cable connection.
Are these Indoor Unit, Outdoor Unit, and Remote Control suitable model numbers to connect?

>> If there is some abnormal condition, correct it by referring to Installation manual and

Data & Technical Manual.

OK

Turn off Power and check/ correct followings.

Is there loose or removed communication line of Indoor Unit and Outdoor Unit?

OK

Check Point 2 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)

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.

OKOK

Check Point 3 : Check Electrical Components at Indoor and Outdoor

Check Voltage at CN6 (terminal 1-3).
(Power supply to Remote Control)

>> If it is DC12V, Remote Control is failure. (Controller PCB is normal) >> Replace Remote Control

>> If it is DC 0V, Controller PCB is failure. (Check Remote Control once again)

>> Check Indoor unit fan motor. (PARTS INFORMATION 4)

If it is normal, replace Controller PCB.

If it is abnormal, replace Indoor unit fan motor and Controller PCB.

>> If the symptom does not change by above Check 1, 2, 3, replace Main PCB of Outdoor unit.

02-25

Trouble shooting 23

No Cooling / No Heating

Forecast of Cause:

1. Indoor Unit error 2. Outdoor Unit error

3. Effect by Surrounding environment

4. Connection Pipe / Connection Wire failure 5. Refrigeration cycle failure

Check Point 1 : Check Indoor Unit

Does Indoor Unit FAN run on HIGH FAN?

Is Air Filter dirty?
Is Heat Exchanger clogged?

Check if Energy save function is operated.

OKOK

Check Point 2 : Check Outdoor Unit Operation

Check if Outdoor Unit is operating
Check any objects that obstruct the air flow route.
Check clogged Heat Exchanger.

Is the Valve open?

OKOK

Check Point 3 : Check Site Condition

Is capacity of Indoor Unit fitted to Room size?
Any windows open? Or direct sunlight ?

OKOK

Check Point 4 :
Check Indoor/ Outdoor Installation Condition

Check connection pipe
(specified pipe length & Pipe diameter?)

Check any loose or removed communication line.

>> If there is an abnormal condition, correct it by
referring to Installation Manual or Data & Technical
Manual.

OKOK

MPa MPa

Check Point 5 : Check Refrigeration Cycle

Check if Strainer is clogged (Refer to the figure at right).

Measure Gas Pressure and if there is a leakage, correct it.

>> When recharging the refrigerant, make sure to perform
vacuuming, and recharge the specified amount.

Check EEV (PARTS INFORMATION 3)
Check Compressor (PARTS INFORMATION 1,2)

Attention

Strainer normally does not have temperature difference
between inlet and outlet as shown in , but if there is a
difference like shown in , there is a possibility of inside
clogged. In this case, replace Strainer.

Pipe (In) Pipe (Out)

Pipe (In) Pipe (Out)

02-26

Trouble shooting 24

Forecast of Cause :

1. Abnormal installation (Indoor/ Outdoor)

Abnormal Noise

2. Fan failure (Indoor/ Outdoor)

3. Compressor failure (Outdoor)

Diagnosis method when Abnormal Noise is occurred

Abnormal noise is coming from Indoor Unit.
(Check and correct followings)

Abnormal noise is coming from Outdoor Unit.
(Check and correct followings)

Is Main Unit installed in stable condition?
Is the installation of Air suction grille and
front panel normal?

OK

Is Fan broken or deformed?
Is the screw of Fan loose?
Is there any object which obstruct the Fan rotation?

Trouble shooting 25

Forecast of Cause:

Water Leaking

Is Main Unit installed in stable condition?
Is Fan Guard installed normally?

OK

Is Fan broken or deformed?
Is the screw of Fan loose?

Is there any object which obstruct the Fan rotation?

OK

Check if vibration noise by loose bolt or contact noise
of piping is happening.

OK

Is Compressor locked?

>> Check Compressor (PARTS INFORMATION 1,2)

1. Erroneous installation 2. Drain hose failure

Diagnosis method when water leak occurs

Is Main Unit installed in stable condition?

Is Main Unit broken or deformed at the time of

transportation or maintenance?

OKOK

Is Drain Hose connection loose?

Is there a trap in Drain Hose?

Is Drain Hose clogged?

OKOK

Is Fan rotating?

Diagnosis method when water is spitting out.

Is the filter clogged?

OKOK

Check Gas Pressure and correct it
if there was a gas leak.

MPa MPa

02-27

2-4 SERVICE PARTS INFORMATION

SERVICE PARTS INFORMATION 1

Compressor

Diagnosis method of Compressor ( If Outdoor Unit LED displays Error, refer to Trouble shooting )

Does not start up

Is there open or loose connection
cable?

Check Main PCB, connection of

Compressor, and winding resistance.

(Refer to the next page).

>> If there is no failure, the defect of
Compressor is considered (Locked
compressor due to clogged dirt or
less oil)

Replace Compressor

Stops soon after starting up

Is there open or loose connection
cable?

Is Gas Pipe Valve open?
(Low Pressure is too low)

MPa MPa

Check if Refrigerant is leaking.
(Recharge Refrigerant)

Abnormal noise

Check if vibration noise by
loose bolt or contact noise
of piping is happening.

Defective Compressor
can be considered.
(due to inside dirt clogging
or broken component)

Replace Compressor

Check if Strainer is clogged.
(PARTS INFORMATION 3)

Check Main PCB, connection of Compressor,and winding
resistance. (Refer to the next page).

>> If there is no failure, the defect of Compressor can be
considered. (Compression part broken or valve defective.)

02-28

Replace Compressor

SERVICE PARTS INFORMATION 2

Inverter Compressor

Check Point 1 : Check Connection

Check terminal connection of Compressor

(loose or incorrect wiring)

Terminal cover opened

S(W)

(WHITE)

C(T)

(BLACK)

R

(RED)

Check Point 2 : Check Winding Resistance

Check winding resistance of each terminal

If the resistance value is 0 or infinite, replace Compressor.

C

Resistance Value :

0.477 at 25°C

R

S

Check Point 3 : Replace Main PCB

If the symptom does not change with above Check 1, 2, replace Main PCB.

02-29

SERVICE PARTS INFORMATION 3

Outdoor unit Electronic Expansion Valve
( EEV )

Check Point 1 : Check Connections

Check connection of connector (CN40)
( Loose connector or open cable )

EXPANSION
VALVE COIL

EV

CN40

1
2
3
4
5

RED
BLUE
ORANGE
YELLOW
WHITE

Check Point 2 : Check Coil of EEV

Remove connector, check each winding
resistance of Coil.

Read wire

Resistance value
White - Red
Yellow - Red
Orange - Red

46 4

at 20°C

Blue - Red

Check Point 3 : Check Voltage from Main PCB.

Remove Connector and check Voltage (DC12V)

If it does not appear, replace Main PCB.

Check Point 4 : Check Noise at start up

Turn on Power and check operation noise.

If an abnormal noise does not show,
replace Main PCB.

If Resistance value is abnormal, replace EEV.

Check Point 5 : Check Opening and Closing Operation of Valve

When Valve is closed,
it has a temp. difference between Inlet and Outlet.

CLOSE
Example : Hot Gas

Pipe (In)

If it is open,
it has no temp. difference between Inlet and Outlet.

OPEN
Example : Hot Gas

Hi TEMP.

DC

Pipe (In)

Hi TEMP.

Pipe (Out)

Normal TEMP.

Pipe (Out)

Hi TEMP.

Check Point 6 : Check Strainer

Strainer normally does not have temperature difference between inlet and outlet as shown in ,
but if there is a difference as shown in , there is a possibility of inside clogged. In this case, replace Strainer.

Pipe (In) Pipe (Out)

02-30

Pipe (In) Pipe (Out)

SERVICE PARTS INFORMATION 4

Indoor unit fan motor

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 2 : Check resistance of Indoor Fan Motor

Refer to below. Circuit-test "Vm" and "GND" terminal.
(Vm: DC voltage, GND: Earth terminal)

>>If they are short-circuited (below 300 k ), replace Indoor fan motor and Controller PCB.

Pin number
(wire color)

1 (Blue)
2 (Yellow)
3 (White)
4 (Black)
5
6 (Red)

Terminal function
(symbol)

Feed back (FG)
Speed command (Vsp)
Control voltage (Vcc)
Earth terminal (GND)
No function
DC voltage (Vm)

SERVICE PARTS INFORMATION 5

Outdoor unit fan motor

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 2 : Check resistance of Outdoor Fan Motor

Refer to below. Circuit-test "Vm" and "GND" terminal.
(Vm: DC voltage, GND: Earth terminal)

>>If they are short-circuited (below 300 k ), replace Outdoor fan motor and Main PCB.

Pin number
(wire color)

1 (Red)
2
3
4 (Black)
5 (White)
6 (Yellow)
7 (Brown)

Terminal function
(symbol)

DC voltage (Vm)
No function
No function
Earth terminal (GND)
Control voltage (Vcc)
Speed command (Vsp)
Feed back (FG)

02-31

WALL MOUNTED type

R410A

INVERTER

3 . APPENDING DATA

3-1. FUNCTION SETTING

3-1-1 INDOOR UNIT

Follow the instructions in the Local Setup Procedure, which is supplied with the remote control,
in accordance with the installed condition.
After the power is turned on, perform the Function Setting on the remote control.

The settings may be selected between the following two: Function Number or Setting Value.
Settings will not be changed if invalid numbers or setting values are selected.

1-1. Setting the Filter Sign

The indoor unit has a sign to inform the user that it is time to clean the filter.
Select the time setting for the filter sign display interval in the table
below according to the amount of dust or debris in the room.
If you do not wish the filter sign to be displayed, select the setting value for "No indication".

( Factory setting)

Setting Description
Standard (400 hours)
Long interval (1000 hours)
Short interval ( 200 hours)
No indication

1-2. Setting the Cooler Room Temperature Correction

Depending on the installed environment, the room temperature sensor may require a correction.
The settings may be selected as shown in the table below.

Setting Description
Standard
Slightly lower control
Lower control
Warmer control

Function Number Setting Value

11

( Factory setting)

Function Number Setting Value

30

00
01
02
03

00
01
02
03

1-3. Setting the Heater Room Temperature Correction

Depending on the installed environment, the room temperature sensor may require a correction.
The settings may be selected as shown in the table below.

( Factory setting)

Setting Description
Standard
Lower control
Slightly warmer control
Warmer control

Function Number Setting Value

31

03-01

00
01
02
03

1-4. Setting the Auto Restart

Enable or disable automatic system restart after a power outage.

( Factory setting)

Setting Description

Yes
No

Function Number Setting Value

00

40

01

1-5. Setting the Indoor room temperature sensor switching function

(Only for Wired remote controller)

The following settings are needed when use the control by
Wired remote controller temperature sensor.

( Factory setting)

Setting Description

No
Yes

* If setting value is "00" : Room temperature is controlled by the indoor unit temperature sensor.
* If setting value is "01" : Room temperature is controlled by either indoor unit temperature sensor or

remote controller unit sensor.

Function Number Setting Value

00

42

01

1-6. Setting the Remote controller signal code

Change the indoor unit Signal Code, depending on the remote controllers.

( Factory setting)

Setting Description

A
B
C
D

Function Number Setting Value

00

44

01
02
03

1-7. Setting the External input control

"Operation/Stop" mode or "Forced stop" mode can be elected.

( Factory setting)

Setting Description

Operation/Stop mode
(Setting forbidden)
Forced stop mode

Function Number Setting Value

00

46

01
02

1-8. Indoor unit fan control for energy saving (Only cooling mode)

Enable or disable indoor unit fan control when the outdoor unit is stopped.

( Factory setting)

Setting Description

Function Number Setting Value
No
Yes

* If setting value is "00" :
When the outdoor unit is stopped, the indoor unit fan operates following the setting on the
remote controller continuously.

* If setting value is "01" :
When the outdoor unit is stopped, the indoor unit fan operates at very low speed intermittently.

49

03-02

00
01

3-1-2 Procedures to change the Function Setting for wireless RC

This procedure changes to the function settings used to control the indoor unit according to
the installation conditions. Incorrect settings can cause the indoor unit malfunction.

After the power is turned on, perform the "FUNCTION SETTING" according to the installation
conditions using the remote controller.

Settings will not be changed if invalid numbers or setting values are selected.

Entering the Function Setting Mode

While pressing the FAN button and SET TEMP.( ) simultaneously,
press the RESET button to enter the function setting mode.

Selecting the Function Number and Setting Value

10°C HEAT

(1) Press the MODE button, and proceed to Fanction Number
and Setting Value.
(There is no necessity for setting remote control signal code. Because
signal code is setting by Fanction Number and Setting Value.)

(2) Press the SET TEMP. ( ) ( ) buttons to select the Function Number.
(Press the MODE button to switch between the left and right digits.)

(3) Press the FAN button to proceed to Setting Value.
(Press the FAN button again to return to the Function Number selection.)

(4) Press the SET TEMP. ( ) ( ) buttons to select the Setting Value.
(Press the MODE button to switch between the left and right digits.)

(5) Press the TIMER MODE button. It makes a signal to indoor unit.
(Indoor unit recognize the setting.)

(6) Press the START/STOP button. It makes a signal to indoor unit.
(Indoor unit run the setting.)

Function Number

1
0

°
C

H
E

A
T

10°C HEAT

Setting Value

10°C HEAT

(7) Press the RESET button to cancel the function setting mode.
(8) After completing the FUNCTION SETTING, be sure to turn of the

power and turn it on again.

CAUTION

After turning off the power, wait 10 seconds or more
before turning on it again.
The FUNCTION SETTING doesn't become effective
if it doesn't do so.

03-03

10°C HEAT

Custom code setting for remote controller

(1) Press the MODE button for more then 5 seconds.

(2) Press the SET TEMP. ( ) ( ) buttons to change the signal code between .
Match the code on the display to the air conditioner signal code. (initially set to )

(3) Press the MODE button. (Return to normal display)

CAUTION

If you change the setting of Fanction Number and Setting Value
after setting custom code in remote controller, please set custom
code in remote controller again.
The remote control unit resets to signal code A when the batteries in
the remote control unit are replaced. If you use a signal code other
than signal code A, reset the signal code after replacing the
batteries.
If you do not know the air conditioner signal code setting, try each
of the signal codes ( ) until you find the code which
operates the air conditioner.

03-04

ethod

3-2. Outdoor unit Pressure Value and Total Electric Current Curve

Outdoor Unit Low Pressure Value and Outdoor Total Electric Current Curve (Cooling)

Model Name : AS*G18LFCA

[Condition]
Ambient

temperature

Indoor / Outdoor - Same temperature

Refrigerant

Standard amount

amount

Piping

5.0m (Height difference 1m)

length

Power

50Hz - 230V

voltage

Operation

TEST mode (Cooling), Hi Fan, Horizontal direction, Front air flow

condition

Measuring

m

Caution

Measure the low pressure with the pressure meter at the service valve. Measure the outdoor
unit overall current with the current clamp meter at Power Cable.

Start operation with the condition of the Indoor Unit air filter clean.

[Constant Frequency Operation Method (Test mode)]

1. Operate on Cooling mode, and press TEST button of remote control.

2. Operate continuously for 30 minutes. (After 60 minutes of operation, Test mode is released automatically.)

(1) Indoor/Outdoor Temperature - Outdoor Low Pressure Curve

AS*G18LFCA

1.3

1.2

1.1

RH70%
RH60%
RH50%

1.0

0.9

0.8

Low-pressure of outdoor unit [MPa

0.7
16 18 20 22 24 26 28 30 32

In/Outdoor ambient temperature [ C]

[50Hz-230V]

(2) Indoor/Outdoor Temperature - Outdoor Total Electric Current Curve

AS*G18LFCA

7.0

6.5

6.0

5.5

5.0

4.5

4.0

Outdoor total electric current [A]

3.5

3.0

16 18 20 22 24 26 28 30 32

RH70%
RH60%
RH50%

In/Outdoor ambient temperature [ C]

[50Hz-230V]

03-05

Outdoor Unit High Pressure Value and Outdoor Total Electric Current Curve (Heating)

e

diti

Model Name : AS*G18LFCA

[Condition]
Ambient

temperatur

Refrigerant

amount

Piping 5.0m (Height difference 1m)

length

Power

voltage

Operation

con

Measuring

method

Indoor 15, 20, 23 °C / Outdoor 2, 7, 12 °C
Standard amount

50Hz - 230V

TEST mode (Heating), Hi Fan, Lower direction, Front air flow

on

outdoor unit overall current with the current clamp meter at Power Cable.

Caution

Start operation with the condition of the Indoor Unit air filter clean.

[Constant Frequency Operation Method (Test mode)]

1. Operate on Heating mode, and press TEST button of remote control.

2. Operate continuously for 30 minutes. (After 60 minutes of operation, Test mode is released automatically.)

(1) Indoor/Outdoor Temperature - Outdoor High Pressure Curve

AS*G18LFCA

23 C

3.1

2.9

2.7

2.5

2.3

High-pressure of outdoor unit [MPa]

2.1
02468101214

Indoor ambient

20 C

temperature[ C]

15 C

Outdoor ambient temperature [ C]

[50Hz-230V]

(2) Indoor/Outdoor Temperature - Outdoor Total Electric Current Curve

AS*G18LFCA

23 C

Indoor ambient

8.0

7.6

7.2

6.8

6.4

Outdoor total electric current [A]

6.0

20 C

temperature[ C]

15 C

02468101214

Outdoor ambient temperature [ C]

[50Hz-230V]

03-06

3-3. Thermistor Resistance Values

3-3-1 INDOOR UNIT

Room temperature thermistor

Temp (°C) Temp (°C)

Resistance(k )

Voltage(V)

-10.0 58.2 0.73

Indoor heat exchanger thermistor

Resistance(k )

-30.0 1131.9 0.21

-5.0 44.0 0.93 -25.0 804.5 0.29

0.0 33.6 1.15 -20.0 579.6 0.40

5.0 25.9 1.39 -15.0 422.9 0.53

10.0 20.2 1.66 -10.0 312.3 0.69

15.0 15.8 1.94 -5.0 233.2 0.88

20.0 12.5 2.22 0.0 176.0 1.10

25.0 10.0 2.50 5.0 134.2 1.36

30.0 8.0 2.77 10.0 103.3 1.63

35.0 6.5 3.03 15.0 80.3 1.92

40.0 5.3 3.27 20.0 62.9 2.21

45.0 4.4 3.49 25.0 49.7 2.51

30.0 39.6 2.79

35.0 31.7 3.06

40.0 25.6 3.30

45.0 20.8 3.53

50.0 17.1 3.73

55.0 14.1 3.90

60.0 11.6 4.05

63.0 10.4 4.14

3-3-2 OUTDOOR UNIT

Voltage(V)

Discharge thermistor

Temp (°C) Temp (°C) Temp (°C)

Resistance(k )

Voltage(V)

-30.0 1013.1 0.06

-25.0 729.1 0.09

-20.0 531.6 0.12

-15.0 392.3 0.16

-10.0 292.9 0.21

-5.0 221.1 0.28

0.0 168.6 0.36

5.0 129.8 0.46

10.0 100.9 0.57

15.0 79.1 0.71

20.0 62.5 0.86

25.0 49.8 1.03

30.0 40.0 1.23

35.0 32.4 1.43

40.0 26.3 1.65

45.0 21.6 1.88

50.0 17.8 2.11

55.0 14.8 2.34

60.0 12.3 2.57

65.0 10.3 2.79

70.0 8.7 3.00

75.0 7.4 3.19

80.0 6.3 3.37

Outdoor heat exchanger thermistor

Resistance(k )

Voltage(V)

-30.0 95.6 0.24

-25.0 68.9 0.32

-20.0 50.3 0.43

-15.0 37.2 0.57

-10.0 27.8 0.73

-5.0 21.0 0.92

0.0 16.1 1.14

5.0 12.4 1.39

10.0 9.6 1.65

15.0 7.6 1.93

20.0 6.0 2.21

25.0 4.8 2.49

30.0 3.8 2.77

35.0 3.1 3.02

40.0 2.5 3.26

45.0 2.1 3.48

50.0 1.7 3.68

55.0 1.4 3.85

60.0 1.2 4.00

65.0 1.0 4.13

70.0 0.8 4.25

75.0 0.7 4.35

80.0 0.6 4.43

Outdoor temperature thermistor

-30.0 224.3 0.73

-25.0 159.7 0.97

-20.0 115.2 1.25

-15.0 84.2 1.56

-10.0 62.3 1.90

-5.0 46.6 2.26

0.0 35.2 2.61

5.0 26.9 2.94

10.0 20.7 3.25

15.0 16.1 3.52

20.0 12.6 3.76

25.0 10.0 3.97

30.0 8.0 4.14

35.0 6.4 4.28

40.0 5.2 4.41

45.0 4.2 4.51

50.0 3.5 4.59

55.0 2.8 4.65

85.0 5.4 3.54

90.0 4.6 3.69

95.0 4.0 3.83

100.0 3.4 3.96

105.0 3.0 4.07

110.0 2.6 4.17

115.0 2.3 4.26

120.0 2.0 4.33

Resistance(k )

Voltage(V)

03-07

1116,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan

Sep. 2011 Printed in Japan