Fujitsu ASYA07LGC Original operating manual

SPLIT TYPE
ROOM AIR CONDITIONER
WALL MOUNTEDtype
Models Indoor unit Outdoor unit
AS*A07LGC
AS*A09LGC
AS*A12LGC
AS*A14LGC
AO*R07LGC
AO*R09LGC
AO*R12LGC
AO*R14LGC
INVERTER
SERVICE
INSTRUCTION
R410A

CONTENTS
1. SPECIFICATION
AS*A09/12LGC, AO*R09/12LGC...................................................................................
2. DIMENSIONS
AS*A09/12LGC, AO*R09/12LGC...................................................................................
3. REFRIGERANT SYSTEM DIAGRAM
AS*A09/12LGC, AO*R09/12LGC...................................................................................
4. CIRCUIT DIAGRAM
AS*A09/12LGC, AO*R09/12LGC....................................................................................
5. DESCRIPTION OF EACH CONTROL OPERATION
1. COOLING OPERATION..............................................................................................
3. DRY OPERATION......................................................................................................
2. HEATING OPERATION..............................................................................................
5. INDOOR FAN CONTROL...........................................................................................
4. AUTO CHANGEOVER OPERATION.........................................................................
7. LOUVER CONTROL...................................................................................................
6. OUTDOOR FAN CONTROL.......................................................................................
9. TIMER OPERATION CONTROL................................................................................
8. COMPRESSOR CONTROL........................................................................................
11. TEST OPERATION CONTROL..................................................................................
10. ELECTRONIC EXPANSION VALVE CONTROL........................................................
13. FOUR-WAY VALVE EXTENSION SELECT...............................................................
12. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )................................
15. MANUAL AUTO OPERATION ( Indoor unit body operation ).....................................
14. AUTO RESTART........................................................................................................
16. FORCED COOLING OPERATION............................................................................
18. COIL DRY OPEARTION CONTROL..........................................................................
17. COMPRESSOR PREHEATING..................................................................................
19. DEFROST OPERATION CONTROL..........................................................................
21. 10°C HEAT OPERATION...........................................................................................
20. OFF DEFROST OPERATION CONTROL..................................................................
01-01
02-01
03-01
04-01
05-01
05-02
05-03
05-04
05-05
05-07
05-08
05-09
05-10
05-12
05-12
05-12
05-12
05-13
05-13
05-13
05-13
05-14
05-16
05-16
22. VARIOUS PROTECTIONS......................................................................................... 05-17
05-12

6. REFRIGERANT CAUTION -R410A-
1. R410A TOOLS............................................................................................................
3. PRECAUTION FOR SERVICING...............................................................................
2. PRECAUTION FOR INSTALLATION.........................................................................
5. DEFFERENCE FROM CONVENTIONAL MODEL(R22) AND PRECAUTIONS........
4. NEW REFRIGERANT R410A.....................................................................................
7. TROUBLE SHOOTING
1. WHEN THE UNIT DOES NOT OPERATE AT ALL....................................................
3. TROUBLE SHOOTING METHOD
2. SELF DIAGNOSIS FUNCTION..................................................................................
8. APPENDING DATA
9. REPLACEMENT PARTS
10. INSTALLATION MANUAL
4. SELF-DIAGNOSIS FUNCTION AND CHECKING POINTS.......................................
5. SERIAL SIGNAL DIAGNOSIS....................................................................................
6. IPM PROTECTION.....................................................................................................
7. TROUBLE SHOOTING OF REFRIGERANT CYCLE.................................................
06-01
06-02
06-04
06-05
06-08
1. Function setting..........................................................................................................
3. Outdoor unit Pressure Value and Total Electric Current Curve..................................
2. Jumper setting of Outdoor unit...................................................................................
5. Capacity/ Input Data...................................................................................................
4. Thermistor Resistance Values....................................................................................
08-01
08-03
08-04
08-08
08-09
07-01
07-02
07-03
07-07
07-08
07-09

1 . SPECIFICATIONS
R410A
WALL MOUNTED type
INVERTER

01-01
SPECIFICATIONS
TYPE Cool & heat inverter
INDOOR UNIT AS*A12LGC
OUTDOOR UNIT AO*R12LGC
COOLING CAPACITY 3.40 kW
HEATING CAPACITY 4.00 kW
POWER SOURCE 230 V
FREQUENCY 50 Hz
RUNNING
CURRENT
MAXIMUM CURRENT
4.3 A
4.6 A
INPUT WATTS 0.895 kW
0.970 kW
E.E.R. Cooling 3.80 kW/kW
COP Heating
Cooling
Heating
Cooling
Heating
Cooling
Heating
Cooling
Heating
4.12 kW/kW
MOISTURE REMOVAL 1.8 L/h
AIR CIRCULATION
HIGH
750 m3/h
750 m3/h
AS*A09LGC
AO*R09LGC
2.50 kW
3.20 kW
230 V
50 Hz
3.2 A
3.7 A
6.5 A
9.0 A
AS*A14LGC
AO*R14LGC
4.00 kW
5.00 kW
230 V
50 Hz
4.9 A
5.7 A
1.080 kW
1.295 kW
3.70 kW/kW
3.86 kW/kW
2.1 L/h
800 m3/h
800 m3/h
9.0 A
10.5 A
6.0 A
7.5 A
0.630 kW
0.750 kW
3.97 kW/kW
4.27 kW/kW
1.3 L/h
750 m3/h
750 m3/h
AS*A07LGC
AO*R07LGC
2.10 kW
3.00 kW
230 V
50 Hz
2.4 A
3.2 A
6.0 A
7.5 A
0.470 kW
0.660 kW
4.47 kW/kW
4.55 kW/kW
1.0 L/h
750 m3/h
750 m3/h
FAN MOTOR
POWER SOURCE 230 V
High speed
INDOOR UNIT Middle speed
Low speed
Quiet
High speed
Middle speed
Low speed
Quiet
Cool 1,440 r.p.m.
Heat 1,440 r.p.m.
Cool 1,500 r.p.m.
Heat 1,500 r.p.m.
Cool 1,300 r.p.m.
Heat 1,300 r.p.m.
Cool 1,020 r.p.m.
Heat 1,080 r.p.m.
Cool 1,200 r.p.m.
Heat 1,200 r.p.m.
Cool 920 r.p.m.
Heat 980 r.p.m.
Cool 680 r.p.m.
Heat 700 r.p.m.
Cool 760 r.p.m.
Heat 840 r.p.m.
C 730-150 r.p.m.
H 650/ 470 r.p.m.
C 860- 200 r.p.m.
H 760/ 680/ 470 r.p.m.
C 1050- 300 r.p.m.
H 870- 480 r.p.m.
OUTDOOR UNIT
ELECTRICAL DATA
INDOOR UNIT
OUTDOOR UNIT
NOISE LEVEL
Cool 43 dB / Heat 43 dB C 44 dB/ H 44 dB
C 25 dB/ H 27 dB
C 40 dB/ H 40 dB
C 33 dB/ H 34 dB
Cool 38 dB / Heat 38 dB
Cool 33 dB / Heat 33 dB
Cool 21 dB / Heat 21 dB
C 45 dB / H 45 dB C 48 dB / H 48 dB C 48 dB / H 49 dB

01-02
COMPRESSOR TYPE
Hermetic type,
4 pole, 3 phase,
DC inverter motor, Rotary
DISCRIMINATION DA89X1C-20FZ 808 903 80(B)
5SS072XAA
STANDARD REFRIGERANT
REFRIGERANT TYPE R410AR410A
800 g
800 g
650 g
650 g
WEIGHT (with oil) 9.9 kg5.9 kg
COMPRESSOR AND REFRIGERANT
Pipe Length 15 m
FULL CHARGE 20 m 900 g
R410A
1000 g
1000 g
9.0 kg
1100 g750 g
MAXIMUM PIPING HEIGHT 15m
ADDITIONAL REFRIGERANT 20 g/m
WEIGHT
INDOOR UNIT Gross / Net
Gross / Net
10 kg / 7.5 kg
OUTDOOR UNIT
35 kg / 32 kg 44 kg / 40 kg28 kg / 25 kg
INDOOR UNIT H x W x D
H x W x D
260 x 790 x 198 mm
OUTDOOR UNIT 540 x 660 x 290 mm
620 x 790 x 298mm
DIMENSIONS
TYPE Cool & heat inverter
INDOOR UNIT AS*A12LGC
OUTDOOR UNIT AO*R12LGC
AS*A09LGC
AO*R09LGC
AS*A14LGC
AO*R14LGC
AS*A07LGC
AO*R07LGC

2 . DIMENSIONS
R410A
WALL MOUNTED type
INVERTER

DIMENSIONS
Models : AS*A07LGC / AO*R07LGC
AS*A09LGC / AO*R09LGC
AS*A12LGC / AO*R12LGC
02-01
(unit : mm)
INDOOR UNIT
OUTDOOR UNIT
260
540
198
790
660290

Models : AS*A14LGC / AO*R14LGC
02-02
(unit : mm)
INDOOR UNIT
OUTDOOR UNIT
260
198
790
790 67 298
620
20

3 . REFRIGERANT SYSTEM DIAGRAM
R410A
WALL MOUNTED type
INVERTER

REFRIGERANT SYSTEM DIAGRAM
Models : AS*A07LGC / AO*R07LGC
AS*A09LGC / AO*R09LGC
AS*A12LGC / AO*R12LGC
AS*A14LGC / AO*R14LGC
03-01
2-Way valve
Strainer
Strainer
3-Way valve
Muffler
Muffler
4-Way valve
Expansion valve
Refrigerant direction
Heat exchanger
(indoor unit)
Heat exchanger
(outdoor unit)
Compressor
Cooling
Heating
For AS*A07/ 09/ 12LGC
Refrigerant pipe diameter
Liquid : 1/4" (6.35 mm)
Gas : 3/8" (9.52 mm)
For AS*A14LGC
Refrigerant pipe diameter
Liquid : 1/4" (6.35 mm)
Gas : 1/2" (12.7 mm)

4 . CIRCUIT DIAGRAM
R410A
WALL MOUNTED type
INVERTER

CIRCUIT DIAGRAM
Models : AS*A07LGC / AO*R07LGC
AS*A09LGC / AO*R09LGC
AS*A12LGC / AO*R12LGC
04-01
INDOOR UNIT
OUTDOOR UNIT
RED
BLACK
RED
BROWN
BLUE
ORANGE
YELLOW
WHITE
WHITE
YELLOW
BROWN
BLACK
BLACK
RED
WHITE
BLACK
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
1
2
3
4
5
6
1
21 2
1
2
3
1
2
3
1
2
3
4
1
2
3
4
CN62
W4
W2
W1
W3
CN61
W10
W11
W7
W8
W9
CN800
CN40
CN501
BLACK
BLACK
RED
WHITE
BLACK BLACK
BLACK
BLACK
BLACK
BLACK
GREEN
WHITE
RED
WHITE
RED
4-WAY VALVE
EXPANSION VALVE
FAN MOTOR
AO*R12LGC
COMPRESSOR
CM
FM
PMV
4WV
R(R)U
C(T)W
S(S)V
LN3
TERMINAL
FUSE
250V - 20A
REACTOR REACTOR
or
THERMISTOR
( PIPE TEMP. )
THERMISTOR
( DISCHARGE PIPE TEMP. )
THERMISTOR
( OUTDOOR TEMP. )
CONTROLLER
PCB ASSEMBLY
BLACK BLACK BLACK BLACK
ORANGE
RED YELLOW PINK BLUE
BROWN BLUE
RED
WHITE
WHITE
WHITE WHITE WHITE
WHITE
BLUE
YELLOW
WHITE
BLACK
RED
GRAY
GRAY
BLACK
WHITE
RED
GREEN
GREEN / YELLOW
1
2
3
4
5 6 7
1
2
3
4
5 6 7
1
2
3
4
5 6 7
1
2
3
4
5 6
1
2
3
4
5 6
1
2
1
2
1
2
3
4
5 1
2
3
4
1
2
3
4
1
2
3
4
5
1
2
3
4
5
CN201
CN1
1 2 345
12345
CN2
CN7
CN3
CN5
CN4
CN6
W4
TERMINAL
EARTH
TERMINAL
POWER RELAY
LN3
LN
POWER SOURCE
TEST
M
FM
FAN MOTOR
THERMISTOR ( ROOM TEMP. )
THERMISTOR ( PIPE TEMP. )
STEP MOTOR
( LOUVER )
CONTROLLER
PCB ASSEMBLY
( MAIN PCB )
INDICATOR PCB ASSEMBLY
THERMAL FUSE 102
CM
S
C
R
AO*R07LGC
AO*R09LGC
COMPRESSOR
TO OUTDOOR UNIT

Models : AS*A14LGC / AO*R14LGC
04-02
INDOOR UNIT
OUTDOOR UNIT
RED
BLACK
RED
BROWN
BLUE
ORANGE
YELLOW
WHITE
WHITE
YELLOW
BROWN
BLACK
BLACK
RED
WHITE
BLACK
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
4
1
2
3
4
CN70
W4
W2
W1
W3
CN71
W10
W11
W7
W8
W9
CN800
CN40
CN30
BLACK
BLACK
RED
WHITE
BLACK BLACK
BROWN
BROWN
BLACK
BLACK
GREEN
WHITE
RED
WHITE
RED
4-WAY VALVE
EXPANSION VALVE
FAN MOTOR
CM
FM
PMV
4WV
R
C
S
LN3
TERMINAL
FUSE
250V - 20A
REACTOR REACTOR
or
THERMISTOR
( PIPE TEMP. )
THERMISTOR
( DISCHARGE PIPE TEMP. )
THERMISTOR
( OUTDOOR TEMP. )
CONTROLLER
PCB ASSEMBLY
BLACK BLACK BLACK BLACK
ORANGE
RED YELLOW PINK BLUE
BROWN BLUE
RED
WHITE
WHITE
WHITE WHITE WHITE
WHITE
BLUE
YELLOW
WHITE
BLACK
RED
GRAY
GRAY
BLACK
WHITE
RED
GREEN
GREEN / YELLOW
1
2
3
4
5 6 7
1
2
3
4
5 6 7
1
2
3
4
5 6 7
1
2
3
4
5 6
1
2
3
4
5 6
1
2
1
2
1
2
3
4
5 1
2
3
4
1
2
3
4
1
2
3
4
5
1
2
3
4
5
CN201
CN1
1 2 345
12345
CN2
CN7
CN3
CN5
CN4
CN6
W4
TERMINAL
EARTH
TERMINAL
POWER RELAY
LN3
LN
POWER SOURCE
TEST
M
FM
FAN MOTOR
THERMISTOR ( ROOM TEMP. )
THERMISTOR ( PIPE TEMP. )
STEP MOTOR
( LOUVER )
CONTROLLER
PCB ASSEMBLY
( MAIN PCB )
INDICATOR PCB ASSEMBLY
THERMAL FUSE 102
TO OUTDOOR UNIT

5 . DESCRIPTION OF EACH
CONTROL OPERATION
R410A
WALL MOUNTED type
INVERTER

( Fig. 1 : Limit of Maximum Frequency based on Outdoor Temperature )
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.
minimum
frequency
maximum
frequency
maximum
frequency
AS*A07/ 09LGC 22Hz 76Hz 79Hz
AS*A12LGC 18Hz 80Hz 96Hz
AS*A14LGC 18Hz 70Hz 80Hz
Outside air Outside air
temperature temperature
36°C
A zone
34°C 32°C
B zone
30°C 21°C
C zone
19°C
D zone
Hi Me Lo Quiet
A zone 79Hz 61Hz 52Hz 37Hz
B zone 79Hz 61Hz 52Hz 37Hz
C zone 79Hz 61Hz 52Hz 38Hz
07LGC
09LGC
D zone 52Hz 43Hz 37Hz 28Hz
E zone 64Hz 55Hz 49Hz 36Hz
F zone 64Hz 55Hz 49Hz 36Hz
A zone 96Hz 61Hz 51Hz 33Hz
B zone 96Hz 61Hz 51Hz 33Hz
C zone 96Hz 61Hz 51Hz 33Hz
12LGC
14LGC
D zone 57Hz 42Hz 36Hz 27Hz
E zone 57Hz 42Hz 36Hz 27Hz
F zone 57Hz 42Hz 36Hz 27Hz
A zone 80Hz 49Hz 38Hz 27Hz
B zone 80Hz 49Hz 38Hz 27Hz
C zone 80Hz 49Hz 38Hz 27Hz
D zone 54Hz 38Hz 30Hz 22Hz
E zone 54Hz 38Hz 30Hz 22Hz
F zone 54Hz 38Hz 30Hz 22Hz
( Table 1 : Compressor Frequency Range )
When the compressor operates for 30 minutes continuously at over the maximum frequency ,
the maximum frequency is changed from Maximum Frequency to Maximum Frequency .
05-01
E zone
F zone
10°C
0°C
12°C
2°C
* 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.
* If the room temperature is 2.5°C lower than a set temperature, the compressor will be
stopped.

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.
However, the maximum frequency is limited in the range shown in Figure 2 based on the
fan speed mode and the outdoor temperature.
( Table 2 : Compressor Frequency Range )
( Fig.2 : Limit of Maximum Frequency based on Outdoor Temperature )
* 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.
05-02
minimum
frequency
maximum
frequency
AS*A07/ 09LGC 22Hz 99Hz
AS*A12LGC 18Hz 130Hz
AS*A14LGC 18Hz 101Hz
Hi Me+ Lo Quiet
AA zone
99Hz 99Hz 79Hz 67Hz
A zone
99Hz 99Hz 79Hz 67Hz
B zone
99Hz 99Hz 79Hz 56Hz
07LGC
09LGC
C zone
AA zone
A zone
B zone
C zone 99Hz 99Hz 79Hz 46Hz
130Hz 130Hz 80Hz 68Hz
130Hz 130Hz 80Hz 68Hz
130Hz 130Hz 80Hz 54Hz
130Hz 130Hz
Me
96Hz
96Hz
96Hz
96Hz
96Hz
96Hz
96Hz
96Hz 80Hz 45Hz
AA zone
A zone
B zone
C zone
101Hz 101Hz 58Hz 45Hz
101Hz 101Hz 58Hz 45Hz
101Hz 101Hz 58Hz 38Hz
101Hz 101Hz
75Hz
75Hz
75Hz
75Hz 58Hz 30Hz
12LGC
14LGC
Outside air Outside air
temperature temperature
19°C
C zone
B zone
A zone
AA zone
17°C
14°C
12°C 7°C
5°C

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
70Hz (for AS*A07/09LGC) or 56Hz (for AS*A12LGC) or 40Hz (for AS*A14LGC), for a minute.
Ts+0.5°C
Ts -1.5°C
Ts -0.5°C
Ts+1.5°C
( Table 3 : Compressor frequency )
( Table 4 : Indoor fan speed )
( Fig.3 : Compressor Control based on Room Temperature )
( Fig.4 : Indoor Fan Control )
05-03
Operating
frequency
37Hz
28Hz
0Hz
07LGC
09LGC
X zone
J zone
Y zone
Operating
frequency
J zone
Y zone
X zone 33Hz
25Hz
0Hz
12LGC
Operating
frequency
J zone
Y zone
X zone 27Hz
20Hz
0Hz
14LGC
Room Room
temperature temperature
X zone
J zone
Y zone
Compressor
ON
OFF
Indoor fan
Setting air flow
Indoor fan
(as shown in Table 4)
S-Lo
OFF
10 30 60 180 60 180 60 10 30
(SEC)
X zone J, Y zone
AS*A07/ 09LGC 620rpm 590rpm
AS*A12LGC
AS*A14LGC
620rpm 590rpm
760rpm 730rpm

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.
When operation starts, only the indoor and outdoor fans are operated for 1 minute. After 1 minute,
the room temperature and outside air temperature are sensed and the operation mode is
selected in accordance with the table below.
C zone
32°C
B zone
-10°C
A zone
( Table.5 Operation mode selection table)
Outside air temperature (TO)
Room temperature (TB)
A zone B zone C zone
TB > TS+2°C Monitoring Cooling
(automatic dry)
Cooling
(automatic dry)
TS+2°C TB TS - 2°C Monitoring Monitoring Monitoring
TB TS - 2°C Heating Heating Monitoring
When COOING was selected at , the air conditioner operates as follow:
The same operation as COOLING OPERATION of item 1 above is performed.
When the room temperature has remained at (set temperature -1°C) for 8 minutes, operation is
automatically switched to DRY and the same operation as DRY OPERATION of item 3 above
is performed.
If the room temperature reaches (set temperature +2°C during DRY operation, operation returns to
COOLING operation.
When HEATING was selected at , the same operation as HEATING OPERATION of item 2
above is performed.
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
<
1
2
31
4
1
( Fig.5 : Outside air temperature zone selection )
05-04

5. INDOOR FAN CONTROL
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.
05-05
1. Fan speed
2. FAN OPERATION
( Table 6 : Indoor Fan Speed )
AS*A07/ 09/ 12LGC
Operation mode Air flow mode Speed (rpm)
1440
1370
1200
980
Cooling
Hi
Hi
700
600
480
1440
Me+
Me
Me
Heating
Lo
Lo
1200
920
Quiet
Quiet
680
Dry
S-Lo
X zone: 680
J zone: 650
Cool air prevention
AS*A14LGC
Operation mode Air flow mode Speed (rpm)
1500
1440
1300
1080
Cooling
Hi
Hi
840
600
480
1500
Me+
Me
Me
Heating
Lo
Lo
1300
1020
Quiet
Quiet
760
Dry
S-Lo
X zone: 760
J zone: 730
Cool air prevention
3. COOLING OPERATION
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 6.
( 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 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
=
HIGH mode
MED mode
LOW mode