Fujitsu AB F18LAT Series Original operating manual

SPLIT TYPE
ROOM AIR CONDITIONER
Floor Ceiling type
Duct type
Cassette type
Models Indoor unit Outdoor unit
AB*F18LAT
AB*F18LBT
AB*F24LAT
AB*F24LBT
AO*A18LALL
AO*B18LALL
AO*A24LALL
AO*B24LALL
INVERTER
SERVICE
INSTRUCTION
R410A
AR*F18LALU
AR*F18LBLU
AR*A24LATU
AR*F24LBTU
AU*F18LAL
AU*F18LBL
AU*A24LBL
AU*F24LBL

CONTENTS
1. DESCRIPTION OF EACH CONTROL OPERATION
COOLING OPERATION...........................................................................................
AUTO CHANGEOVER OPERATION.......................................................................
INDOOR FAN CONTROL.........................................................................................
OUTDOOR FAN CONTROL.....................................................................................
01-01
HEATING OPERATION............................................................................................ 01-02
DRY OPERATION..................................................................................................... 01-03
01-04
01-05
01-08
COMPRESSOR CONTROL......................................................................................
01-09
TIMER OPERATION CONTROL.............................................................................. 01-13
ELECTRONIC EXPANSION VALVE CONTROL..................................................... 01-17
TEST OPERATION CONTROL................................................................................ 01-17
PREVENT TO START FOR 3 MINUTES (3 MINUTES ST)...................................... 01-17
4-WAY VALVE EXTENSION SELECT..................................................................... 01-18
AUTO RESTART...................................................................................................... 01-18
MANUAL AUTO OPERATION (When using the Wireless RC)............................. 01-18
COMPRESSOR PREHEATING................................................................................ 01-20
EXTERNAL ELECTRICAL HEATER CONTROL..................................................... 01-19
FRESH AIR CONTROL............................................................................................ 01-19
ECONOMY OPERATION.......................................................................................... 01-23
VARIOUS PROTECTIONS....................................................................................... 01-24
FORCED COOLING OPERATION........................................................................... 01-25
COMPRESSOR STOP CONTROL........................................................................... 01-25
DEFROST OPERATION CONTROL........................................................................ 01-20
OFF DEFROST OPERATION CONTROL................................................................ 01-22
LOUVER CONTROL.................................................................................................
01-12
1-1
1-2
1-3
1-4
1-5
1-6
1-8
1-7
1-13
1-9
1-10
1-11
1-12
1-14
1-15
1-16
1-17
1-18
1-19
1-20
1-21
1-22
1-23
1-24
OUTDOOR UNIT DISPLAY.................................................................................
WIRED REMOTE CONTROLLER DISPLAY.......................................................
ERROR DISPLAY.....................................................................................................
2. TROUBLE SHOOTING
TROUBLE SHOOTING WITH ERROR CODE..........................................................
TROUBLE SHOOTING WITH NO ERROR CODE...................................................
SERVICE PARTS INFORMATION...........................................................................
02-01
02-01
02-03
02-31
02-04
02-36
2-1
2-2
2-3
2-4
2-1-1
2-1-2

3. APPENDING DATA
03-01
03-01
03-03
03-04
FUNCTION SETTING................................................................................................
03-05
EXTERNAL INPUT & OUTPUT................................................................................
INDOOR UNIT......................................................................................................
03-06
Procedures to change the Function Setting.........................................................
WIRED REMOTE CONTROLLER.......................................................................
3-1
3-1-1
3-1-2
3-1-3
3-1-4
Switching Remote Control Unit Signal Codes......................................................
3-2

R410A
FLOOR CEILING /
DUCT / CASSETTE type
INVERTER
1 . DESCRIPTION OF EACH
CONTROL OPERATION

1-1. COOLING OPERATION
1-1-1 COOLING CAPACITY CONTROL
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.
The maximum frequency is limited in the range shown in Figure 1 based on the fan speed mode
and the outdoor temperature.
* If the room temperature is 2 degC higher than a set temperature,
the compressor operation frequency will attain to maximum frequency.
* If the room temperature is 2.5 degC lower than a set temperature, the compressor will be stopped.
* When the room temperature is between +2 degC to -2.5 degC of the setting temperature,
the compressor frequency is controlled within the range shown in Table1.
minimum
frequency
maximum
frequency
AB*F18, 24
AR*F18, 24
AU*F18, 24
18Hz 113Hz
18Hz 113Hz
AR*A24LATU
AU*A24LBL
Outdoor air
temperature
A zone
B zone
C zone
D zone
E zone
F zone
Hi Me Lo Quiet
A zone 113Hz
113Hz
85Hz
54Hz
75Hz
75Hz
54Hz
54Hz
54Hz 45Hz
45Hz 38Hz
34Hz
34Hz
34Hz
27Hz
113Hz
113Hz
80Hz
54Hz
66Hz
66Hz
54Hz
54Hz
54Hz 45Hz
45Hz 38Hz
34Hz
34Hz
34Hz
24Hz
B zone
C zone
AB*F18, 24
AR*F18, 24
AU*F18, 24
D-F zone
A zone
B zone
C zone
AR*A24LATU
AU*A24LBL
D-F zone
( Table 1 : Compressor Frequency Range )
( Fig. 1 : Limit of Maximum Frequency based on Outdoor Temperature )
01-01
Fan speed mode
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
1-2-1 HEATING CAPACITY CONTROL
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.
The maximum frequency is limited in the range shown in Figure 2 based on the outdoor temperature.
* If the room temperature is lower 3 degC than a set temperature,
the compressor operation frequency will attain to maximum frequency.
* If the room temperature is higher 2.5 degC than a set temperature, the compressor
will be stopped.
* When the room temperature is between +2.5 degC to -3 degC of the setting temperature,
the compressor frequency is controlled within the range shown in Table2.
( Table 2 : Compressor Frequency Range )
( Fig.2 : Limit of Maximum Frequency based on Outdoor Temperature )
01-02
Outdoor air
temperature
A zone
B zone
C zone
When the room
temperature rises
When the room
temperature drops
17°C
12°C
19°C
14°C
Hi
Me+ Me Lo Quiet
A zone 120Hz
120Hz
120Hz
101Hz
101Hz
70Hz
70Hz
113Hz 113Hz
60Hz
60Hz
70Hz
120Hz
120Hz
120Hz
101Hz
101Hz
75Hz
75Hz
101Hz 75Hz
60Hz
60Hz
60Hz
B zone
C zone
AB*F18, 24
AR*F18, 24
AU*F18, 24
A zone
B zone
C zone
AR*A24LATU
AU*A24LBL
Fan speed mode
minimum
frequency
maximum
frequency
AB*F18, 24
AR*F18, 24
AU*F18, 24
18Hz 120Hz
AR*A24LATU
AU*A24LBL 18Hz 120Hz

1-3. DRY OPERATION
1-3-1 INDOOR UNIT CONTROL
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 Fig 3.
Room
temperature Room temperature
Compressor ON
Ts+1.5 degC
Ts+0.5 degC
Compressor OFF
( Table 3 : Compressor frequency )
( Fig.3 : Compressor Control based on Room Temperature )
01-03
Operating frequency
Ts : Setting temperature
AB*F18, 24
AR*F18, 24
AU*F18, 24
34Hz
Compressor
ON
OFF
Indoor fan
Dry air flow
S-Lo
OFF
( Fig.4 : Indoor Fan Control )
10 30 60 180 60 180 60 10 30 (SEC)
AR*A24LATU
AU*A24LBL 34Hz

01-04
1-4. 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 swiched in accordance with temperature changes.
The temperature can be set between 18°C and 30°C in 1 degC steps.
When operation starts, only the indoor and outdoor fans are operated for 1 minute.
After 1 minute, the room temperature and outdoor air temperature are sensed and
the operation mode is selected in accordance with the table below.
( Table 4 : Operation mode selection table )
1
Room temperature :Tb
Outdoor temperature :To
Tb > Ts +2 degC
Ts +2 degC > Tb
==
Ts +2 degC > Tb > Ts-2 degC
Cooling
(Automatic Dry)
Cooling
(Automatic Dry)
Monitoring
Monitoring Monitoring Monitoring
Monitoring
Heating Heating
Ts : Setting temperature
A zone B zone C zone
A zone
B zone
C zone
32°C
-10°C
When COOLING was selected at , the air conditioner operates as follow:
The same operation as COOLING OPERATION of item 5-1 above is performed.
However, the setting temperature is raised 1degC and the room temperature correct coefficient value is 0°C
When the compressor frequency have been below 20Hz for 8 minutes or the room temperature reaches
"setting temperature -1.5°C" , operation is automatically switched to DRY OPERATION of item 5-3 above
is performed.
However, compressor control based on room temperature is as follows.
If the room temperature reaches "setting temperature +2°C" during DRY operation,
operation returns to COOLING operation.
When HEATING was selected at , the same operation as HEATING OPERATION of item 5-2
above is performed. However, the room temperature correct coefficient value is 0°C.
When the compressor was stopped for 6 consecutive minutes by the temperature control function
after the COOLING or HEATING operation mode was selected at above, operation is switched
to MONITORING and the operation mode is selected again.
1
2
31
4
1
( Fig.5 : Outdoor air temperature zone selection )
Room
temperature Compressor :ON
Compressor :OFF
Ts -0.5°C
Ts -1.5°C

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, LOW, MED, HIGH,
while the indoor fan only runs.
When Fan mode is set at (Auto), it operates on [MED] Fan Speed.
01-05
Operation mode Air flow mode Speed (rpm)
Hi 1040
950
840
740
Me
Lo
Dry
Monitoring
Quiet
740
450
Auto
S- Lo
Cooling
Heating
Fan
AR*F18LALU / AR*F18LBLU
Operation mode Air flow mode Speed (rpm)
Hi 1040
950
800
740
Me
Lo
Dry
Monitoring
Quiet
Hi
Me+
Lo
Quiet
1040
1000
800
740
740
300
Auto
S- Lo
Cooling
Fan
Heating
AB*F18LAT / AB*F18LBT
Me 950
Operation mode Air flow mode Speed (rpm)
Hi 730
630
540
460
Me
Lo
Dry
Monitoring
Quiet
Hi
Me+
Lo
Quiet
830
770
630
500
460
300
Auto
S- Lo
Cooling
Fan
Heating
AU*F18LAL / AU*F18LBL
Me 730
Operation mode Air flow mode Speed (rpm)
Hi 830
700
600
550
Me
Lo
Dry
Monitoring
Quiet
550
350
Auto
S- Lo
Cooling
Heating
Fan
AR*A24LATU / AR*F24LBTU
Operation mode Air flow mode Speed (rpm)
Hi 1330
1150
1000
780
Me
Lo
Dry
Monitoring
Quiet
Hi
Me+
Lo
Quiet
1300
1200
1000
780
780
300
Auto
S- Lo
Cooling
Fan
Heating
AB*F24LAT / AB*F24LBT
Me 1150
Operation mode Air flow mode Speed (rpm)
Hi 960
850
650
500
Me
Lo
Dry
Monitoring
Quiet
Hi
Me+
Lo
Quiet
960
930
740
580
500
300
Auto
S- Lo
Cooling
Fan
Heating
AU*A24LBL / AU*F24LBL
Me 880

4. HEATING OPERATION
01-06
3. COOLING OPERATION
( 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 > - 1.5 degC
=
- 2.5 degC > TR-Ts
- 1.5 degC > TR-Ts > - 2.5 degC
=
TR-Ts > 2 degC
=
1 degC > TR-Ts
2 degC > TR-Ts > 1 degC
=
TR-Ts > 2.5 degC
=
1.5 degC > TR-Ts
2.5 degC > TR-Ts > 1.5 degC
=
TR-Ts > - 1 degC
=
- 2 degC > TR-Ts
- 1 degC > TR-Ts > - 2 degC
=
HIGH mode
MED mode
LOW mode
( Fig.7 : Airflow change - over ( Heating : AUTO ) )
When the room
temperature rises
When the room
temperature drops
TR : Room temperature
Ts : Setting temperature
LOW mode
MED mode
HIGH mode
Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature,
as shown in Figure 6.
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 5.
Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature,
as shown in Figure 7.
On the other hand, if switched [HIGH] [QUIET], the indoor motor will run at a constant airflow of [HEAT]
operation modes QUIET, LOW, MED, HIGH, as shown in Table 5.

5. COOL AIR PREVENTION CONTROL (Heating mode)
6. DRY OPERATION
Refer to the Figure 4.
During the dry mode operation, the fan speed setting can not be changed.
01-07
The maximum value of the indoor fan speed is set as shown in Figure 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] mode.
( Fig.8 : Cool Air Prevention Control )
SETTING
FAN MODE
LOW mode
S-LOW mode
37°C
29°C
32°C
24°C
Indoor heat exchanger
temperature
Indoor heat exchanger
temperature
HIGH mode
LOW mode
S-LOW mode
37°C
29°C
32°C
24°C
Indoor heat exchanger
temperature
Indoor heat exchanger
temperature
Fan mode : HIGH Fan mode : MED, LOW, QUIET
5-2. For Duct type
[ Cool air prevention 500rpm, S-Lo 300rpm ]
39°C
32°C
Indoor heat exchanger
temperature
Indoor heat exchanger
temperature
S-Lo
Lo (Qu)
Cool air
prevention
37°C
30°C
34°C
24°C
Setting
FAN mode
42°C
30°C
34°C
Indoor heat exchanger
temperature
Indoor heat exchanger
temperature
Hi
Me+
Lo
Cool air
prevention
39°C
37°C
37°C
32°C
24°C
S-Lo
Fan mode : HIGH Fan mode : MED, LOW, QUIET
5-1. For Ceiling type
[ Cool air prevention 400rpm, S-Lo 300rpm ]
39°C
32°C
Indoor heat exchanger
temperature
Indoor heat exchanger
temperature
S-Lo
Lo (Qu)
Cool air
prevention
37°C
30°C
34°C
24°C
Setting
FAN mode
42°C
30°C
34°C
Indoor heat exchanger
temperature
Indoor heat exchanger
temperature
Hi
Me+
Lo
Cool air
prevention
39°C
37°C
37°C
32°C
24°C
S-Lo
Fan mode : HIGH Fan mode : MED, LOW, QUIET
5-3. For Cassette type

1-6. OUTDOOR FAN CONTROL
1. Outdoor Fan Motor
Following table shows the fan speed of the outdoor unit.
01-08
Table 6 : Fan speed of the outdoor unit
Table 7 : Fan speed when starting up outdoor fan
Outdoor temperature
The outdoor fan speed is changed in the range of the speed shown in the above table,
based on the frequency of the compressor.
(When the compressor frequency increases, the outdoor fan speed is also changed to
higher speed. If the compressor frequency decreases, the outdoor fan speed is changed
to the lower speed as well.)
After starting up the outdoor fan, it operates with the following speed for initial 20 seconds.
After operating the defrost control function on heating mode except economy operation,
its speed becomes 1020/ 950rpm (18L) and 1100/ 1050rpm (24L) regardless of the
compressor frequency.
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°C.
Over than 12°C
Less than 12°C
Over than 12°C
Less than 12°C
Cooling Dry
860/ 820/ 670/ 500 rpm
400/ 340/ 280/ 250/ 230 rpm 500 rpm
950/ 820/ 670/ 500 rpm
400/ 340/ 280/ 250/ 230 rpm
500 rpm
AO*A18LALL
AO*B18LALL
AO*A24LALL
AO*B24LALL
Outdoor temperature
Over than 12°C
Less than 12°C
Fan speed
500 rpm
200 rpm
AO*A18/24LALL
AO*B18/24LALL
Heating
1020/ 950/ 820/ 750/ 670/ 550/ 450 rpm
1100/ 1050/ 1000/ 730/ 670/ 550/ 450 rpm
AO*A18LALL
AO*B18LALL
AO*A24LALL
AO*B24LALL

1-7. LOUVER CONTROL
01-09
1-1. VERTICAL LOUVER CONTROL
Each time the button is pressed, the air direction range will change as follows:
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.
Cooling / Dry / Fan mode Horizontal flow
Heating mode Downward flow
(Function Range)
(Fig.9 : Air Direction Range)
(Operation Range)
1-2. SWING OPERATION
When the swing signal is received from the remote controller, the vertical louver starts to swing.
The range of swing depends on the set airflow direction.
When the indoor fan is either at S-Lo or Stop mode, the swinging operation is interrupted
and the louver stops at the memorized position.
( Stop mode means Operation stop.)
During Cooling/Dry mode :
During Heating mode :
Fan mode :
During AUTO mode operation, for the first minute after beginning operation, air-flow will be horizontal
; the air direction cannot be adjusted during this period.
The type of operation
Cooling/Dry
Range of swing
to
Heating to
567
567
7
567
FAN( ) to
to
7
3
7
3
to
FAN( )
to 7
5
1. For Ceiling Type

01-10
1-3. HORIZONTAL LOUVER CONTROL
Each time the button is pressed, the air direction range will change as follows:
(Function Range)
(Fig.10 : Air Direction Range)
1-4. SWING OPERATION
When the swing signal is received from the remote controller, the horizontal louver starts to swing.
The range of swing depends on the set airflow direction.
When the indoor fan is either at S-Lo or Stop mode, the swinging operation is interrupted
and the louver stops at the memorized position.
( Stop mode means Operation stop.)
The type of operation
Cooling/Dry
Range of swing
to
Heating to
5
FAN to
5
RIGHT/LEFT air direction louvers
Use the air direction adjustments within the ranges shown above.
The remote control unit's display does not change.
5
5
(All range)
(All range)
(All range)

01-11
2-1. VERTICAL LOUVER CONTROL
Each time the button is pressed, the air direction range will change as follows:
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.
Cooling / Dry / Fan mode Horizontal flow
Heating mode Downward flow
(Function Range)
(Fig.9 : Air Direction Range)
(Operation Range)
2-2. SWING OPERATION
When the swing signal is received from the remote controller, the vertical louver starts to swing.
The range of swing depends on the set airflow direction.
When the indoor fan is either at S-Lo or Stop mode, the swinging operation is interrupted
and the louver stops at the memorized position.
1
2
3
4
( Stop mode means Operation stop.)
During Cooling/Dry mode/Fan mode :
During Heating mode :
During AUTO mode operation, for the first minute after beginning operation, air-flow will be horizontal
; the air direction cannot be adjusted during this period.
The type of operation
Cooling/Dry/Fan
Range of swing
to
Heating to
2. For Cassette Type

1-8. COMPRESSOR CONTROL
1. OPERATION FREQUENCY RANGE
The operation frequency of the compressor is different based on the operation mode as
shown in Table 8.
Cooling Heating
Min Max Min Max Dry
(Table 8 : Compressor Operation Frequency Range)
2. OPERATION FREQUENCY CONTROL AT START UP
The compressor frequency soon after the start-up is controlled as shown in Figure 9.
(Fig.9 : Compressor Control at Start-up)
40Hz
90sec 180sec 270sec
59Hz
01-12
AO*A18LALL
AO*B18LALL 18Hz 113Hz 18Hz 120Hz 34Hz
AO*A24LALL
AO*B24LALL 18Hz 113Hz 18Hz 120Hz 34Hz
85Hz

01-13
AR-6TC1
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
1-9-1 Wired Remote Controller
ON / TIMER
OFF / TIMER
WEEKLY TIMER
TEMPERATURE SET BACK TIMER
1-9. TIMER OPERATION CONTROL

01-14
The DAY OFF setting is only available for days for which weekly settings already exist.
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.
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
3. TEMPERATURE SET BACK TIMER
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
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. Chenge the setting temperature:
22°C 24°C

01-15
AR-SY1
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
1-9-2 Wireless Remote Controller
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

01-16
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
+1degC
+2degC
-2degC
-1degC
-4degC
-3degC
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 30min 30min