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13

1-1

COOL operation
In the “COOL” mode, the thermostat circuit is
controlled by four thermostat lines (C1 thru C4).

1-3

HEAT operation
In the “HEAT” mode, the thermostat circuit
is controlled by six thermostat lines (H01 thru
H4).

1-2

DRY operation
In the “DRY” mode, the thermostat circuit is
controlled by three thermostat lines (D1 thru
D3).

The indoor fan motor is controlled in the indoor unit,
and the outdoor fan motor, compressor, and reverse
valve are controlled in the outdoor fan motor.
The operation mode of the outdoor unit is basically
decided by the indoor operation mode.
When the outdoor unit operation mode is heat, and the
indoor unit operation mode is cool or dry, or the outdoor
unit operation is heat, the Busy - LED in the indoor unit
flikers.  When the operation mode of the indoor
unit(called "A1", "A2") changes, the opeartion mode of
the outdoor unit changes in Table Y-1.

18

32

C1

C2

C3

C4

17.5

18.5

19.5

20.5

31.5

32.5

33.5

34.5

Preset temperature (˚C)

Room temperature (˚C)

Room temperature(˚C)

Preset temperature (˚C)

18

32

D1

D2

D3

17.5

18.5

19.5

31.5

32.5

33.5

Preset temperature (˚C)

H4

H3

H2

H1

H02

H01

17

19

21

22

24

26

31

33

35

36

38

40

18

32

Room temperature(˚C)

14

2-2

DRY operation
On the switch on, the compressor always starts
to operate for 2 minutes with fan speed “D”
(slower than “UL”).
The microcomputer reads the room temperature
2 minutes after this first compressor operation.
This room temperature is set as the preset
temperature automatically.
The preset temperature ranges from 18˚C to
32˚C. When the room temperature is below
18˚C, the preset temperature is  set to 18˚C,
and when the room temperature is over 32˚C,
the preset temperature is set to 32˚C.
Dry operation is divided into three zones
(Cooling zone, Dehumidifying zone and
Circulating zone) by thermostat lines (D1 to
D3), and the compressor and the fan motor are
controlled in each zone as shown in Table Y-2.

Room temperature (˚C)

Preset temperature (˚C)

Room 
temperature
transition

D3

D2

D1

States 1 & 5 : Cooling zone
States 2 & 4 : Dehumidifying zone
States 3 : Circulating zone

3

4

5

1

2

Room temperature (˚C)

Preset temperature (˚C)

Room
temperature
transition

States 1 & 3 : Compressor ON
States 2  : Compressor OFF

H1

H2

3

1

2

2-3

Heat operation
The compressor turns on or off, at State  2 ,
turns on continuously at State  1  &  3 .

Compressor

Fan speed

Cooling zone

ON

"UL"

Dehumidifying
zone

ON

"D"

Circulating
zone

OFF

"D" or "OFF"

Present mode

Indoor unit

A1

A2

A1

A2

OFF

OFF

OFF

OFF HEAT

HEAT

COOL

COOL

DRY

DRY

FAN
ONLY

FAN

ONLY

HEAT

or 

OFF

HEAT

HEAT

HEAT HEAT

HEAT

COOL

DRY

FAN
ONLY

COOL

or

OFF

COOL

COOL

COOL HEAT

COOL

COOL

DRY

FAN
ONLY

DRY

or 

OFF

DRY

DRY

DRY HEAT

DRY

COOL

DRY

FAN
ONLY

FAN

ONLY

or 

OFF

FAN

ONLY

FAN

ONLY

FAN

ONLY

HEAT

HEAT

COOL

COOL

DRY

DRY

FAN
ONLY

FAN

ONLY

Indoor unit

Outdoor 

unit

Outdoor 

unit

New mode

The busy : LED of the indoor unit flickers.

2-1 COOL operation

The compressor turns on or off, at the thermostat lines
C3 and C4. The outdoor fan motor is also controlled
with the compressor.

Room temperature (˚C)

Preset temperature (˚C)

Room 
temperature
transition

C3

C4

States 1 & 3 : Compressor ON
State 2 : Compressor OFF

1

2

3

15

2-4

Fan only operation
The indoor fan motor always turns on.

Fan speeds are given by the indoor fan motor,
"H", “M”, “L” and “UL” which are available in the
following operation mode.

HEAT

COOL

HIGH

FAN Switch

H

M

LOW

SOFT

M

L

L

UL

FAN ONLY

M

L

UL

This function automatically controls the on-off operation
of the indoor fan motor in accordance with the on-off
operation of the compressor during the heating
operation, thereby preventing the air conditioner from
delivering a cold air when the compressor is off.
When the room temperature exceeds the thermostat
line “H1”, the compressor is turned off, and the indoor
fan motor is turned off after rotating at “UL” for 30
seconds.
3 minutes after turning off the compressor, the
compressor is turned on for 3 minutes. (below
thermostat line H01). While over H01, the compressor
is off.
At 10 seconds after turning on the compressor, the
indoor fan motor is turned  on.
The next compressor OFF time is for 3, 8 or 15 minutes
according to the room temperature (the time increases
with a rise of room temperature) when 3 minutes
elapse after turning on the compessor (the compressor
is off when compressor OFF time is 15 minutes).

This function is intended to prevent cold air from being
discharged when the heating operation starts or when
defrosting.
When the indoor pipe temperature is below 29˚C at the
begining of the heat operation or after defrosting, the
indoor fan motor stays.
When the indoor pipe temperature gets higher than
29˚C, the fan motor is turned on at speed “UL” after
compensation of starting.
When the indoor pipe temperature exceeds 35˚C, the
specified fan speed is restored. When the indoor pipe
temperature falls below 30˚C, the fan speed shifts
down to “UL”. And, when the indoor pipe temperature
falls below 24˚C, the fan motor turns off. Then, over
29˚C , it turns on again at speed “UL”.

Pipe temperature(˚C) 

24

29

30

35

OFF

UL

UL

UL

OFF

Preset

Fan speed

When overloading occurs during the heating operation,
this system controls the outdoor fan motor according to
the indoor pipe temperature to prevent the overloading
of the compressor and restrain the rise in high pressure.
When the indoor pipe temperature exceeds 53˚C, the
outdoor fan motor is turned off, and when the indoor
pipe temperature falls 48˚C, the outdoor fan motor
turns on.
If 3 minutes elapse after turning off outdoor fan motor,
the outdoor fan motor is turned on, when the indoor
pipe falls 53˚C.

OFF

OFF

ON

ON

53˚C

48˚C

53˚C

48˚C

In the case of turn off
time is within 3 minutes

In the case of turn off
time is over 3 minutes

Compressor

ON

OFF

Indoor
fan motor

30sec.

time

UL

ON

OFF

3 min.
(Notes)

3 min.

10sec.

UL

30sec.

10sec.

Thermo off

3 or 8 or 15min.

(Notes)

Notes: Compressor is off when compressor OFF time is 15 minutes.

16

This system, in order to prevent overcurrent during
heating operation, controls the outdoor fan motor and
changes the indoor fan motor speed by detecting total
current.
When the current exceeds P1, the compressor is
automatically stopped. (during heat or cool or dry
operation)
When the current exceeds P2, the outdoor fan motor is
automatically turned off, and when the current falls
below P4, the outdoor fan motor is turned on.
When the current exceeds P3 and the indoor fan speed
shifts down because of cold air (5. Preheat air flow), the
changes in the indoor fan speed shifts up as follows,
from "D" to "UL", or from "UL" to "L". And when the
current falls bellow P5, the indoor fan speed shift up is
canceled.

When the indoor pipe temperature falls below -1˚C
during cool operation or dry operation, the compressor
is turned off.

The defrost timer (integrating the operation time of
compressor) counts time with microcomputer during
heat operation.
40 minutes later after starting to operation, or 30
minutes later after defrost, when the outdoor pipe
temperature falls -5˚C, the defrosting is started, and
when the outdoor pipe temperature exceeds 11˚C, the
defrosting is ended.
In the defrost operation, first the compressor is turned
off, the san speed is set yo "UL" and the outdoor fan
motor is turned off.
30 seconds later the inddor fan motor is turned off, 50
seconds later the reverse valve is turned off, and 60
seconds later the compressor is turned on.
In the end of defrosting the compressor is turned off,
the outdoor fan motor is turned on, 50 seconds later the
reverse valve is turned on, 60 seconds lateer the
compressor is turned on, starting heat operation.
At this time, the indoor fan motor is turned off or the fan
spedd is set to "UL"  if preheat air flow function is
effective.

Outdoor
Fan motor 
OFF

Indoor
Fan motor
Shift UP

Compressor
OFF

Time

Input current

Current transition

P1   6.3A

P2   5.7A

P3   5.0A

P4   4.3A

P5   4.0A

When the heat operation is shut down or the operating
mode is switched from heat to cool or dry, or vice versa,
the reverse valve is switched after 3 minutes.

If the “TEST RUN” button in the unit is pushed during
suspension of operation, cool test operation starts. At
this time, the fan speed is set to “AUTO”.
If this button is pushed during operation, the test
operation starts in current operation mode. The
operation LED (red) flickers during test run.
In cool and  heat mode continuous compressor on
operation is performed. In dry mode the operation is in
dehumidifying zone. In fan only mode the indoor fan
motor runs continusly.

12-1 24-HOUR PROGRAMMABLE ON/OFF TIMER

ON-TIMER or OFF-TIMER can be
independently programmed. When the unit
operates during one hour after the OFF-time is
set, thermostat setting is automatically shifted
(+1˚C in cool operation and dry operation, -3˚C
in heat operation, but, 16˚C set temperature at
the lowest).
When the ON-timer is set in heat operation
and cool operation, operation starts before 0 to
30 minutes(depends on the room temperature)
so that preset temperature is obtaind at set
time.

12-2 ONE-HOUR TIMER

When ONE-HOUR timer is set, the unit turns
off automatically after one hour. The one hour
timer operation has priority over other time
operation, such as the TIMER ON and TIMER
OFF. If the ONE-HOUR TIMER button is
pressed again during operation, the unit will
operate additionally for another one hour.

Defrost start

Compressor

Reverse
Valve

Outdoor
Fan Motor

Indoor
Fan Motor

Preheat Air
Flow Control

30sec.

MAX. 9min.

50sec. 10sec.

60sec.

ON

OFF

ON

OFF

ON

OFF

ON

OFF

50sec. 10sec.

ON

OFF
ON

OFF
ON

OFF

ON

OFF

UL

Switch ON

Heating

Heating

Heating

Min. 
40min.

Max.
11min.

Min.
30min.

Max.
11min.

Defrost

Defrost