Fujitsu Siemens Computers AU* G45LRLA, AR* G45LMLA, AO* G45LETL, AR* G54LHTA, AO* G54LETL Service Instruction

SPLIT TYPE
ROOM AIR CONDITIONER

Cassette type
Duct type
Ceiling type

Models Indoor unit Outdoor unit

AU* G45LRLA
AR* G45LMLA
AR* G45LHTA
AB* G45LRTA

AU* G54LRLA
AR* G54LHTA

AO* G45LETL
AO* G54LETL

INVERTER

SERVICE

INSTRUCTION

R410A

CONTENTS

1. SPECIFICATIONS

1. DESCRIPTION OF EACH CONTROL OPERATION

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

1-4 AUTO CHANGEOVER OPERATION.........................................................................

1-5 INDOOR FAN CONTROL...........................................................................................

1-6 OUTDOOR FAN CONTROL.......................................................................................

1-7 COMPRESSOR CONTROL.......................................................................................

01-01

1-2 HEATING OPERATION..............................................................................................

01-02

1-3 DRY OPERATION.......................................................................................................

01-03

01-04
01-06
01-09

01-10

1-8 TIMER OPERATION CONTROL................................................................................

01-11

1-9 ELECTRONIC EXPANSION VALVE CONTROL.......................................................

01-15

1-10 TEST OPERATION CONTROL...............................................................................

01-15

1-11 PREVENT TO START FOR 3 MINUTES (3 MINUTES ST).....................................

01-16

1-12 4-WAY VALVE EXTENSION SELECT.....................................................................

01-16

1-13 AUTO RESTART......................................................................................................

01-16

1-14 PUMP DOWN...........................................................................................................

01-17

1-15 COMPRESSOR PREHEATING...............................................................................

01-18

1-16 10°C HEAT OPERATION (For AB type)..................................................................

01-18

1-20 VARIOUS PROTECTIONS.......................................................................................

01-22

1-21 COMPRESSOR STOP CONTROL...........................................................................

01-24

1-19 OFF DEFROST OPERATION CONTROL................................................................

01-21

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

2. TROUBLE SHOOTING

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

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

2-4 SERVICE PARTS INFORMATION............................................................................

02-01

02-30

02-04

02-35

1-18 DEFROST OPERATION CONTROL........................................................................

01-19

1-17 ECONOMY OPERATION.........................................................................................

01-18

1-27 DESCRIPTION OF DISPLAY UNIT..........................................................................

01-27

1-24 LOW NOISE OPERATION.......................................................................................

01-25

1-25 PEAK CUT OPERATION..........................................................................................

01-25

1-26 DRAIN PUMP OPERATION (For AU/ AR type)......................................................

01-26

1-23 EXTERNAL ELECTRICAL HEATER CONTROL.....................................................

01-25

1-22 FRESH AIR CONTROL............................................................................................

01-24

1 . DESCRIPTION OF EACH
CONTROL OPERATION

R410A

Cassette/ Duct/ Ceiling type

INVERTER

1-1. COOLING OPERATION

A sensor (room temperature thermistor) built in the indoor unit 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 Figure 1 based on the
fan speed mode and the outdoor temperature.

minimum
frequency

maximum
frequency

16rps

16rps

16rps
16rps

93rps

90rps

85rps

100rps

AU* G45LRLA
AR* G45LMLA
AB* G45LRTA
AR* G45LHTA
AU* G54LRLA
AR* G54LHTA

Hi Me Lo Qu

93rps
93rps
78rps
73rps

75rps
75rps
68rps
56rps

68rps
68rps
56rps
47rps

44rps
44rps
44rps
29rps

100rps
100rps
85rps
76rps

78rps
78rps
73rps
62rps

73rps
73rps
62rps
50rps

44rps
44rps
44rps
29rps

85rps
85rps
78rps
68rps

77rps
77rps
68rps
62rps

76rps
76rps
68rps
56rps

---

---

---

---

90rps
90rps
85rps
73rps

85rps
85rps
76rps
68rps

81rps
81rps
73rps
62rps

---

---

---

---

A zone
B zone
C zone

AU* G45LRLA
AR* G45LMLA
AB* G45LRTA

AU* G54LRLA

D-F zone
A zone
B zone
C zone
D-F zone
A zone
B zone

C zone

AR* G45LHTA

AR* G54LHTA

D-F zone

( Table 1 : Compressor Frequency Range )

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

01-01

A zone
B zone
C zone
D-F zone

Fan speed mode

1. DESCRIPTION OF EACH CONTROL OPERATION

Outdoor air
temperature

A zone

B zone

C zone

D zone

E zone

F zone

When the room
temperature rises

When the room
temperature drops

36°C

32°C

21°C

12°C

2°C

34°C

30°C

19°C

10°C

0°C

1-2. HEATING OPERATION

A sensor (room temperature thermistor) built in the indoor unit 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 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 temperature, 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 )

01-02

minimum
frequency

maximum
frequency

16rps

110rps

AU* G45LRLA
AR* G45LMLA
AB* G45LRTA
AR* G45LHTA
AU* G54LRLA
AR* G54LHTA

1-3. DRY OPERATION

The compressor rotation frequency shall change according to set temperature and room
temperature variation which the room temperature sensor of the indoor unit has detected
as shown in the Table 3.

( Table 3 : Compressor frequency )

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

01-03

Ts : Setting temperature

Ts+0.5°C

Ts+1.5°C

Operating
frequency

44rps

X zone

0rps

Y zone

Room Room
temperature temperature

X zone

Y zone

AU* G45LRLA
AR* G45LMLA
AB* G45LRTA
AR* G45LHTA
AU* G54LRLA
AR* G54LHTA

Compressor

ON

OFF

Indoor fan
Setting air flow

OFF

10 30 60 180 60 180 60 10 30

(sec)

S-Lo

Compressor

ON

OFF

Lo

OFF

30 180 120 180 30

(sec)

Indoor fan

ON

5 30 5

( Fig 3-2 : Indoor Fan Control for AR*G45/ 54LHTA )

( Fig 3-1 : Indoor Fan Control for AU*G45/ 54LRTA, AR*G45LMLA, AB*G45LRTA )

Indoor fan air flow *1

*1 : AU*G45LRLA ---> 470rpm, AU*G54LRLA ---> 480rpm
AB*G45LRTA ---> 680rpm, AR*G45LMLA ---> 670rpm,

1-4. AUTO CHANGEOVER OPERATION

01-04

When the air conditioner is set to the Auto mode by remote controller, operation starts in the optimum
mode from among the Heating, Cooling, Dry and Monitoring mode. 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.

When operation starts, indoor fan and outdoor fan are operated for around 3 minutes.
Room temperature and outdoor temperature are sensed, and the operation mode is selected
in accordance with the table below. <Monitoring mode>

Cooling mode

25°C

Heating mode

( Table 4 : Operation mode selection table )

Room temperature (TR)

TR> Ts+2°C

Ts+2°C TR Ts -2°C

*Middle zone

TR < Ts -2°C Heating

When Cooling or Dry mode was selected at and air flow mode is Auto, the air conditioner operates as follow.

The same operation as COOLING OPERATION AND DRY OPERATION of page 01-01 is performed.
When the room temperature has remained at set temperature -1.5°C, operation is automatically
switched to Dry mode.
If the room temperature reaches set temperature +2°C during Dry mode, operation returns to Cooling.

When Heating was selected at , the same operation as HEATING OPERATION of page
01-02 is performed.

When the compressor was stopped for 6 consecutive minutes by the temperature control function
after the Cooling(Auto:Dry) or Heating mode was selected at above, operation is switched
to Monitoring and the operation mode is selected again.

1

1

2

3

1

4

1

( Fig.4 : Outdoor temperature zone selection )

Cooling

(Autmatic dry)

Operation mode

*If it's Middle zone, operation mode of indoor unit is selected as below.

(1). Same operation mode is selected as outdoor unit.

If outdoor unit is operating in Cooling, Dry, and Heating mode,
indoor unit will be operated by the same operation mode.

(2). Selected by the outdoor temperature.

If outdoor unit is operating in other than Cooling, Dry, and Heating mode, indoor unit will be operated
according to the outdoor temperature as below.

Cooling

Cooling

Dry

Dry

Compressor stop

When the room
temperature drops

When the room
temperature rises

Ts +2°C

Ts -0.5°C

Ts -1.5°C

Ts +1°C

Ts -1.5°C

Ts -2.5°C

( Fig.5 : Auto changeover : Cooling - Dry )

TR : Room temperature
Ts : Setting temperature

TR : Room temperature
Ts : Setting temperature

( Air flow mode : Auto )

01-05

START

Room temp.

Ts+2°C?

COOLING (AUTO:DRY)

OPERATION

HEATING OPERATION

YES

YES

NO

NO

NO

AUTO CHANGEOVER operation flow chart

TS : Setting temperature

Room temp.

Ts -2°C?

Thermostat remains

in OFF state for 6 minutes or

longer?

System stops

or operation command other than

auto changeover operation?

NO

Thermostat remains

in OFF state for 6 minutes or

longer?

System stops

or operation command other than

auto changeover operation?

Middle zone

NO

Operation mode of

outdoor unit : Cooling or Dry?

YES

NO

Operation mode of outdoor unit

: Heating?

YES

NO

YES

Outdoor temperature

25°C?

NO

YES

YES

NO

YES

YES

1-5. INDOOR FAN CONTROL

1. Fan speed

( Table 5 : Indoor Fan Speed )

2. FAN OPERATION

The airflow can be switched in 5 steps such as Auto, Quiet, Lo, Me, Hi, while the indoor fan only runs.
The High Static Pressure Duct type is 4 steps such as Auto, Lo, Me, Hi.

01-06

AU* G45LRLA

Operation
mode

Air flow
mode

Speed
(rpm)

Hi
Me+
Me
Lo
Quiet
Cool air prevention
Hi
Me
Lo
Quiet
*Soft Quiet

690
650
610
550
470
300
690
610
550
470
300
470
270

Heating

Cooling
Fan

Dry
S-Lo

AU* G54LRLA

Operation
mode

Air flow
mode

Speed
(rpm)

Hi
Me+
Me
Lo
Quiet
Cool air prevention
Hi
Me
Lo
Quiet
*Soft Quiet

720
680
630
570
480
300
720
630
570
480
300
480
270

Heating

Cooling
Fan

Dry
S-Lo

*Note, during Economy operation and operation mode is Fan, air flow is 1 step downs.
(Hi > Me, Me > Lo, Lo > Quiet, Quiet > Soft Quiet)

AB* G45LRTA

Operation
mode

Air flow
mode

Speed
(rpm)

Hi
Me+
Me
Lo
Quiet
Cool air prevention
Hi
Me
Lo
Quiet
*Soft Quiet

1200
1100
1000
830
680
500
1200
1000
830
680
500
680
250

Heating

Cooling
Fan

Dry
S-Lo

AR* G45LMLA

Operation
mode

Air flow
mode

Speed
(rpm)

Hi
Me+
Me
Lo
Quiet
Cool air prevention
Hi
Me
Lo
Quiet
*Soft Quiet

1300

--­1020
840
670

--­1310
1020
840
670
420
670
420

Heating

Cooling
Fan

Dry
S-Lo

*Note, during Economy operation and operation mode is Fan, air flow is 1 step downs.
(Hi > Me, Me > Lo, Lo > Quiet, Quiet > Soft Quiet)

AR* G45/ 54LHTA
(Normal static pressure: 100Pa)

Operation
mode

Air flow
mode

Speed
(rpm)

Hi
Me
Lo

1300
1150
1000

Heating
Cooling
Fan

4. HEATING OPERATION

Switch the airflow [Auto], and the indoor fan motor will run according to a room temperature,
as shown in Fig.7.
On the other hand, if switched in [Hi] ~ [Lo], the indoor motor will run at a constant airflow
of [Heat] operation modes Lo, Me, Hi, as shown in Table 5.

01-07

( Fig.7 : Airflow change - over ( Heating : Auto ) )

3. COOLING OPERATION

Switch the airflow [Auto], and the indoor fan motor will run according to a room temperature,
as shown in Fig.6.
On the other hand, if switched in [Hi] ~ [Lo], the indoor motor will run at a constant airflow of [Cool]
operation modes Lo, Me, Hi, as shown in Table 5.

( Fig.6 : Airflow change - over ( Cooling : Auto ) )

When the room
temperature rises

When the room
temperature drops

TR : Room temperature
Ts : Setting temperature

TR-Ts > 2°C

=

1°C > TR-Ts

2°C > TR-Ts > 1°C

=

TR-Ts > 2.5°C

=

1.5°C > TR-Ts

2.5°C > TR-Ts > 1.5°C
=

Hi mode

Me mode

Lo mode

*1

When the room
temperature rises

When the room
temperature drops

TR-Ts > -1°C

=

-2°C > TR-Ts

-1°C > TR-Ts > -2°C
=

TR-Ts > -1.5°C

=

-2.5°C > TR-Ts

-1.5°C > TR-Ts > -2.5°C
=

Lo mode

Me mode

Hi mode

*1 : Contains a condition to the following

When the operation mode is set to AUTO mode
at the start of operation.
When the setting temperature was changed.
When the operation mode was changed to Cooling mode.
When the airflow mode was changed to AUTO mode.

5. COOL AIR PREVENTION CONTROL (Heating mode)

6. DRY OPERATION

Refer to the Fig. 3-1, 3-2.
During the dry mode operation, the fan speed setting can not be changed.

7. [For AU*G45/ 54LRTA, AR*G45LMLA, AB*G45LRTA]
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.3-1.

8. [For AU*G45/ 54LRTA, AR*G45LMLA, AB*G45LRTA]
INDOOR UNIT FAN (CONTROL FOR ENERGY SAVING (Cooling mode))

Switch the airflow at cooling mode, and the indoor fan motor will run as shown in Fig.3-1.
It depends on the Function setting "Indoor unit fan control for energy saving".

01-08

The maximum value of the indoor fan speed is set as shown in Fig.8, based on the detected
temperature by the indoor heat exchanger sensor on heating mode.
When the compressor does not operate, the indoor fan motor operates [S-Lo] or [Stop] mode.

( Fig.8 : Cool Air Prevention Control )

[ AU*G45/ 54LRLA, AB*G45LRTA ]

[ AR*G45LMLA ]

*Hi
or setting fan mode

*Lo
or setting fan mode

37°C

29°C

32°C

24°C

Indoor heat exchanger
temperature rises

Indoor heat exchanger
temperature drops

Cool air
prevention

S-Lo

S-Lo

42°C

30°C

34°C

Indoor heat exchanger
temperature rises

Indoor heat exchanger
temperature drops

Hi

*Me+
or setting fan mode

*Lo
or setting fan mode

*Lo
or setting fan mode

*Lo
or setting fan mode

39°C

37°C

37°C

32°C

24°C

*Lower speed is selected.

42°C

30°C

34°C

Indoor heat exchanger
temperature rises

Indoor heat exchanger
temperature drops

Hi

*Me+
or setting fan mode

*Lo
or setting fan mode

39°C

37°C

37°C

32°C

24°C

*Lower speed is selected.

*Lower speed is selected.

Hi

*Lo
or setting fan mode

*Lo
or setting fan mode

37°C

29°C

32°C

24°C

Indoor heat exchanger
temperature rises

Indoor heat exchanger
temperature drops

*Lower speed is selected.

13 min. later

13 min. later

[ AR*G45/ 54LHTA ]

Setting fan mode

stop

27°C

Indoor heat exchanger
temperature

Setting fan mode

Lo

27°C

Indoor heat exchanger
temperature

13 min. later

1-6. OUTDOOR FAN CONTROL

1. Outdoor Fan Motor

Following table shows the fan speed of the outdoor unit.

*

The outdoor fan speed changes in the range mentioned above depending on the compressor
frequency and outdoor temperature.
(When the compressor frequency and outdoor temperature increase, the outdoor fan speed
also changes to the higher speed.
When the compressor frequency and outdoor temperature decrease, the outdoor fan
speed also changes to the lower speed.)

*

It runs at 500rpm for 20 seconds after starting up the outdoor fan.
However, the fan operates at 200rpm when the initial rotation speed is 300rpm or less.

01-09

( Table 6 : Fan speed of the outdoor unit )

AO* G45LETL
AO* G54LETL

After operating the defrost control function on heating mode except economy operation,
its speed becomes 900rpm(Upper) / 880rpm(Lower) regardless of the compressor speed.
However, it returns to the normal speed control when the defrosting operation does not function
for 240 minutes after releasing the defrost operation or when the outdoor temperature sensor
detection value becomes higher than 5℃.

*

The compressor and the fan start-up at the same time, and the fan stops after the compressor
stops and 60 seconds has passed.

*

The fan doesn't operates fan 10 seconds after the fan stops.

*

Cooling / Dry Heating

Upper fan
/Lower fan

850/800, 780/750, 750/700
540/520, 360/340, 290/270
480/ 0 , 400/ 0, 350/ 0
280/ 0

900/880, 850/830, 780/750
720/700, 570/550, 500/480
370/350, 300/280, 220/200

1-7. COMPRESSOR CONTROL

1. OPERATION FREQUENCY RANGE

The operation frequency of the compressor is different based on the operation mode as
shown in Table 7.

Cooling Heating

Min

Max

Min Max

Dry

(Table 7 : Compressor Operation Frequency Range)

01-10

AO* G45LETL

16rps
16rps

93rps

----

85rps

----

----

100rps

----

90rps

AO* G54LETL

16rps
16rps

110rps
110rps

44rps
44rps

2. OPERATION FREQUENCY CONTROL AT START UP

The compressor frequency soon after the start-up is controlled as shown in Fig.9.

(Fig.9 : Compressor Control at Start-up)

39

90

57

68

180 420

85

(rps)

Upper

limit

speed

(sec)480

Elapsed time

39

200

57

68

700 840

85

(rps)

Upper

limit

speed

(sec)1010

Elapsed time

39

90

57

68

210 270

85

(rps)

Upper

limit

speed

(sec)300

Elapsed time

Ta : Outdoor temperature

< Normal start-up >
Immediate start-up after power-ON (cooling)

Immediate start-up after power-ON (Hearting Ta < 10℃)

Immediate start-up after power-ON (Hearting Ta > 10℃)

=

45LRLA
45LMLA
45LRTA

45LHTA 54LRLA 54LHTA

1-8. TIMER OPERATION CONTROL

1. ON / OFF TIMER

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

The weekly timer allows up to two ON and OFF time to set up per day.

Use this timer function to set operating time for each day of the week.

Operation mode

The operating time can be set in 30 min increments only.
The OFF time can be carried over to next day.
The ON timer and the OFF timer functions cannot be set with using the weekly timer.

Both ON and OFF time must be set.

2. WEEKLY TIMER

2-1. WEEKLY TIMER

Stop mode

Stop mode

Stop mode

Operation mode

Operation mode

Set time

Set time Set time Set time

01-11

AR-WAE1E

1-8-1 Wired Remote Controller (with AU, AR model)

ON / TIMER
OFF / TIMER

WEEKLY TIMER

TEMPERATURE SET BACK TIMER

01-12

The DAY OFF setting is only available for days for which weekly settings already exist.

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

Normal

Next day setting

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.

2-2. DAY OFF setting

Stop mode

Stop mode

Operation mode

Stop mode

Operation mode

Preceding day Next day

DAY OFF

Stop mode

Stop mode

Operation mode

Stop mode

Operation mode

DAY OFF

Setting day

Preceding day Next daySetting day

The SET BACK timer only changes the set temperature for 7 days, 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.

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.

3. TEMPERATURE SET BACK TIMER

Case of SET BACK timer on the Cooling operation.
( Setting temperature :22°C, SET BACK temperature :26°C)

SET BACK setting

Operation
temperature

Operation
temperature

26°C

22°C

26°C

22°C

24°C

*1

ON OFF OFFON

*1: During the SET BACK function,
the setting temperature is changed.

Change the setting temperature:
22°C 24°C

01-13

AR- RAH2E

1. ON / OFF TIMER

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

ON / TIMER
OFF / TIMER

PROGRAM TIMER

SLEEP TIMER

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

Stop mode

Stop mode

Operation mode

Operation mode

Set time

Set time Set time Set time

1-8-2 Wireless Remote Controller (with AB model)

01-14

3. SLEEP TIMER

If the sleep timer 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.

Set temperature rises

( Ts : Set temperature )

Stop of operation

Set temperature lowers

( Ts : Set temperature )

Ts

Stop of operation

In the COOLING operation mode

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

Ts

+1°C

+2°C

-2°C

-1°C

-4°C

-3°C

Set

60min

In the HEATING operation mode

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

Set

30min

60min

90min

1-9. ELECTRONIC EXPANSION VALVE CONTROL

1-10. TEST OPERATION CONTROL

01-15

Under the condition where the air conditioner stops, press the MASTER CONTROL button and
the FAN CONTROL button simultaneously for 2 seconds or more, and the test operation control
mode will appear.
During test running, " " will display on the remote controller display.
Set the test operation mode, and the compressor will continue to run regardless of whatever
the room temperature sensor detects.
The test operation mode is released if 60 minutes have passed after setting up the test operation.

With Wired Remote Controller

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.

Pulse range

53~480 pulse

(1) Pulse range of EEV

(2) The EEV is set up at 480 pulses when the compressor is stopped.

(3) Initialization (Input of 528 pulses toward closing direction) is operated under the following condition.

* When the power is turned on.

* 4 hours has passed since the last initialization, and 3 minutes has passed after the compressor stop.
(If 12 hours has passed since the last initialization, the compressor is compulsorily stopped.)

AO* G45LETL
AO* G54LETL

Cooling / Dry

Heating

Operation

Under the condition where the air conditioner runs, press the TEST RUN button, and
the test operation control mode will appear.
During test running, the Operation LED and Timer LED of the air conditioner body blinks simultaneously.
Set the test operation mode, and the compressor will continue to run regardless of whether the room
temperature sensor detects.
The test operation mode is released if 60 minutes have passed after setting up the test operation.

With Wireless Remote Controller

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

At the time when the air conditioner is switched from the cooling mode to heating mode,
the compressor is stopped, and the 4-way valve is switched in 3 minutes later
after the compressor stopped.

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 resumed with
the memorized operation contents.
When the power is interrupted and recovered during timer operation, timer operation is canceled,
but only setting time is memorized.

[Operation contents memorized when the power is interrupted]

Operation mode
Set temperature

Set air flow

Timer mode and timer time (Set by wireless remote controller)

10°C HEAT (Wireless remote controller is in use)

ECONOMY

1-11. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )

1-12. 4-WAY VALVE EXTENSION SELECT

1-13. AUTO RESTART

01-16

WARNING

Never touch electrical components such as the terminal blocks except the button on
the display board. It may cause a serious accident such as electric shock.

During the pump-down operation, make sure that the compressor is turned off
before you remove the refrigerant piping.
Do not remove the connection pipe while the compressor is in operation with 2-way
or 3-way valve open. This may cause abnormal pressure in the refrigeration cycle
that leads to breakage and even injury.

CAUTION

Perform the pump down operation before disconnecting any refrigerant pipe or
electric cable.

Collect refrigerant from the service port or the 3-way valve if pump down cannot be
performed.

In case of a group control system installation, do not turn the power off pump down is
completed in all outdoor units.
(Group control system installation described in “SPECIAL INSTALLATION
METHODS” in the installation manual of the indoor unit.)

Operate [PUMP DOWN] • button on the display board in the manner described
below.

LED display part

Button part

14.1. Preparation for pump down

Confirm that the power is off, and then open the service panel•

14.2. Pump down procedure

(1) Check the 3-way valves (both the liquid side and gas side) are opened.

(2) Turn the power on.

POWER

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

MODE (L1) (L2) (L3) (L4) (L5) (L6)

Sign “ ”: Lights off, “ ”: Lights on

(3) Press [PUMP DOWN] button for 3 seconds or more after 3 minutes after power on.

LED display lights on as shown in the above figure, and the fans and the
compressor start operating.

If the [PUMP DOWN] button is pressed while the compressor is operating, the •
compressor will stop, then start again in about 3 minutes.

(4) LED display will change as shown below about 3 minutes after the compressor

starts. Fully close the 3-way valve on the liquid pipe side at this stage.

If the valve on the liquid pipe side is not closed, the pump down cannot be •
performed.

(5) When LED display changes as shown in the below figure, close the 3-way valve on

the gas pipe side tightly.

If the valve on the gas pipe side is not closed, refrigerant may flow into the piping•
after the compressor stops.

Step (5)

Closing direction

Step (4)

Hexagon wrench

Liquid pipe

Gas pipe

Closing direction

(6) LED display changes after 1 minute as shown in the figure below

Fans and compressor stop automatically.

If the pump down is successfully completed (the above LED display is shown), the •
outdoor unit remains stopped until the power is turned off.

(7) Turn the power off.

PUMP DOWN is completed.

(Note)

To stop pump down, press the [PUMP DOWN] button again.•
To start the pump down again after the compressor is automatically stopped due to an •
error, turn the power off and open the 3-way valves. Wait 3 minutes, turn the power on
and start the pump down again.

When starting the operation after completion of the pump down, turn the power off, •
and then open the 3-way valves. Wait 3 minutes, turn the power on and perform a test
run in the “COOL” operation mode.

If an error occurs, recover the refrigerant from service port.•

SW1 SW2 SW3 SW4 SW5

POWER

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

MODE (L1) (L2) (L3) (L4) (L5) (L6)

Sign “ ”: Lights off, “ ”: Lights on

POWER

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

MODE (L1) (L2) (L3) (L4) (L5) (L6)

Sign “ ”: Lights off, “ ”: Lights on

POWER

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

MODE (L1) (L2) (L3) (L4) (L5) (L6)

Sign “ ”: Lights off, “ ”: Lights on

POWER

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

MODE (L1) (L2) (L3) (L4) (L5) (L6)

Sign “ ”: Lights off, “ ”: Lights on

POWER

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

MODE (L1) (L2) (L3) (L4) (L5) (L6)

Sign “ ”: Lights off

01-17

1-14. PUMP DOWN

1-15. COMPRESSOR PREHEATING

01-18

When the outdoor temperature is lower than 20°C and the all operation mode 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 26°C or greater,
preheating is ended.

1-16. 10°C HEAT OPERATION (For AB type)

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

Mode Heating

Setting temperature 10°C

Fan mode AUTO

( Table8 )

1-17. 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.

Mode Cooling/ Dry Heating

Target temperature Setting temp.+1°C Setting temp.-1°C

( Table9 )

01-19

1-18. DEFROST OPERATION CONTROL

1. CONDITION OF STARTING THE DEFROST OPERATION

Integratingdefrost

(Constant monitoring)

If the compressor continuous operation time is less than 10 minutes,
the OFF number of the compressor is counted.
If any defrost operated, the compressor OFF count is cleared.

2. CONDITION OF THE DEFROST OPERATION COMPLETION

Defrost operation is released when the conditions becomes as shown in Table 13.

( Table 13 : Condition of defrost release )

Release Condition

Outdoor heat exchanger temperature is higher than 10°C
or
Compressor operation time has passed 15 minutes.

The defrost operation starts as shown in the following Table 10, 11, and 12.

From 2nd and later

defrost after

starting operation

Less than 35 minutes More than 35 minutes

Does not operate

Compressor integrating operation time

( Table 10 : Condition of 1st defrost operation)

1st defrost

after

starting operation

Compressor integrating operation time

Less than 22 minutes More than 22 minutes More than 62 minutes

Does not operate

Outdoor heat exchanger temperature

Below -9°C

Outdoor heat exchanger temperature

Below -10°C

Outdoor heat exchanger temperature

Below -5°C

More than 240 minutes

( For long continuous operation )

Less than 10 minutes

( For intermittent operation )

Compressor integrating operation time

Outdoor heat exchanger temperature

Below -3°C

OFF count of the compressor

40 times

( Table 12 : Condition of Integrating defrost operation)

( Table 11 : Condition of 2nd defrost operation)

01-20

3. Defrost Flow Chart

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

(Not defrosted for 10 minutes)

Heating operation start : Compressor ON

Outdoor heat exchanger temperature: Over 10°C

or

Compressor ON time: Maximum 15 minutes

Defrost end

Compressor
integrating
operation:
Over 22 minutes

Compressor
integrating
operation:
Over 62 minutes

Outdoor
heat exchanger
temperature:
Below - 9°C

Outdoor
heat exchanger
temperature:
Below - 5°C

Compressor
integrating
operation:
Over 35 minutes

2nd and later defrost

Compressor : OFF
Outdoor fan motor : OFF
30 sec later 4-way valve : OFF
36 sec later compressor : ON

Compressor
integrating
operation:
Over 240 minutes

Integrating defrost

(Constant monitoring)

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

Defrost start

Outdoor
heat exchanger
temperature:
Below - 10°C

Outdoor
heat exchanger
temperature:
Below - 3°C

Compressor
OFF count :
40 times

1st defrost

1-19. OFF DEFROST OPEARTION CONTROL

01-21

1. OFF DEFROST OPERATION CONDITION

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.

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

OFF Defrost Flow Chart

Heating operation stop

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

Defrost start

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

Outdoor heat exchanger temperature : Over 10°C

or

Compressor ON time : Maximum 15 minutes

Defrost end

2. OFF DEFROST RELEASE CONDITION

Release Condition

Outdoor heat exchanger temperature is higher than 10°C
or
Compressor operation time has passed 15 minutes.

( Table 14 : OFF Defrost Release Condition )

OFF defrost operation is released when the conditions becomes as shown in Table 14.

1-20. VARIOUS PROTECTIONS

01-22

1. DISCHARGE GAS TEMPERATURE OVERRISE PREVENSION CONTROL

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

104°C 101°C 110°C

When the discharge temperature becomes higher than Temperature ,the compressor frequency
is decreased 14rps, and it continues to decrease the frequency for 14rps every 120 seconds until
the temperature becomes lower than Temperature .

When the discharge temperature becomes lower than Temperature , 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.

(Table15 : Discharge Temperature Over Rise Prevension Control / Release Temperature)

Temperature

Temperature

Temperature

[ Heating ]

[ Cooling ]

T0 > 50°C

=

T0: Outdoor temperature

Outdoor unit fan speed (rpm)

T0 < -15°C

50°C > T0 > 46°C

=

46°C > T0 > 40°C

=

40°C > T0 > 38°C

=

38°C > T0 > 31°C

=

31°C > T0 > 19°C

=

19°C > T0 > 13°C

=

13°C > T0 > 7°C

=

7°C > T0 > 0°C

=

0°C > T0 > -5°C

=

-5°C > T0 > -10°C

=

-10°C >T0 > -15°C

=

850/800 780/750 750/700 540/520 360/340 290/270 480/ 0 400/ 0 350/ 0 280/ 0

12.5/12.0 6.5/ 6.0

5.0/ 4.5

8.0/ 7.5

9.0/ 8.5

9.0/ 8.5

10.0/ 9.5

10.0/ 9.5

10.0/ 9.5 6.0/ 5.5

10.5/10.0

12.5/12.0

12.0/11.5 10.0/ 9.5

12.5/12.0

13.0/12.5

14.5/14.0

15.5/15.0 11.5/11.0

11.0/10.5

13.5/13.0

13.5/13.0

14.5/14.0

15.0/14.5

15.5/15.0

16.0/15.5

13.5/13.0

16.5/16.0

17.5/17.0

19.5/19.0 19.0/18.5 16.5/16.0

T0 > 20°C

=

T0: Outdoor temperature

Outdoor unit fan speed (rpm)

T0 < 12°C

20°C > T0 > 12°C

=

900/880 850/830 780/750 720/700 570/550 500/480 370/350 300/280 220/200

16.5/16.0

14.5/14.0

19.5/19.0

The compressor frequency is controlled so that the outdoor unit input current does not exceeds
the current limit value 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 16 : Current Release Operation Value / Release Value)

2. CURRENT RELEASE CONTROL