Fujitsu ASU 9RLF, AOU 9RLFW, AOU12RLFW, AOU15RLS, ASU12RLF Service Instructions Manual

SPLIT TYPE
ROOM AIR CONDITIONER

WALL MOUNTED

INVERTER

SERVICE

INSTRUCTION

Models Indoor unit Outdoor unit

ASU 9RLF
ASU12RLF
ASU15RLS

type

AOU 9RLFW
AOU12RLFW
AOU15RLS

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..................................................................................

MINIMUM HEAT OPERATION....................................................................................

18.

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

20.

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

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

22. VARIOUS PROTECTIONS.......................................................................................... 01-16

01-01

01-02

01-02

01-03

01-04

01-06

01-07

01-08

01-09

01-11

01-11

01-11

01-11

01-11

01-12

01-12

01-12

01-12

01-12

01-13

01-15

2. TROUBLE SHOOTING

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

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

2-1-2 OUTDOOR UNIT DISPLAY................................................................................

2-1-3 INDOOR UNIT DISPLAY....................................................................................

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

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

2-4 SERVICE PARTS INFORMATION.............................................................................. 02-29

3. APPENDING DATA

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

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

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

3-2 Thermistor Resistance Values.....................................................................................

3-2-1 INDOOR UNIT....................................................................................................

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

02-01

02-01

02-02

02-03

02-04

02-24

03-01

03-01

03-03

03-05

03-05

03-05

WALL MOUNTED type

INVERTER

R410A

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 4°F(2°C) higher than a set temperature, the compressor operation

frequency will attain to maximum performance.

* If the room temperature is 5°F(2.5°C) lower than a set temperature, the compressor will be

stopped.

* When the room temperature is between +4°F(+2°C) to -5°F(-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 Figure1 based on the
fan speed mode and the outdoor temperature.

( Table1 : Compressor Frequency Range )

minimum
frequency

maximum
frequency

ASU9RLF 22rps 79rps

ASU12RLF 18rps 96rps

ASU15RLS 15rps 80rps

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

Outside air Outside air
temperature temperature

A zone 79rps 61rps 52rps 37rps

B zone 79rps 61rps 52rps 37rps

C zone 79rps 61rps 52rps 37rps

D zone 52rps 43rps 37rps 28rps

E zone 64rps 55rps 49rps 36rps

F zone 64rps 55rps 49rps 36rps

A zone

B zone

C zone

D zone

E zone

F zone

A zone

B zone

C zone

D zone

E zone

F zone

93.2°F
(34°C)

86°F

(30°C)

66.2°F
(19°C)

50°F

(10°C)

32°F
(0°C)

A zone

B zone

C zone

D zone

E zone

F zone

96.8°F

(36°C)

89.6°F

(32°C)

69.8°F

(21°C)

53.6°F

(12°C)

35.6°F
(2°C)

9RLF

12RLF

15RLS

Hi Me Lo Quiet

96rps 61rps 51rps 33rps
96rps 61rps 51rps 33rps

96rps 61rps 51rps 33rps

57rps 42rps 36rps 27rps

57rps 42rps 36rps 27rps

57rps 42rps 36rps 27rps

80rps 45rps 37rps 29rps
80rps 45rps 37rps 29rps

80rps 45rps 37rps 29rps

47rps 37rps 31rps 22rps

47rps 37rps 31rps 22rps

47rps 37rps 31rps 22rps

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 6°F(3°C) than a set temperature, the compressor operation

frequency will attain to maximum performance.

* If the room temperature is higher 5°F(2.5°C) than a set temperatire, the compressor will be

stopped.

* When the room temperature is between +5°F(+2.5°C) to -6°F(-3°C) of the setting temperature,

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

( Table2 : Compressor Frequency Range )

minimum
frequency

ASU9RLF 22rps 99rps

ASU12RLF 18rps 130rps

ASU15RLS 15rps 119rps

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 Table3.
However, after the compressor is driven, the indoor unit shall run at operation frequency of
64rps (9RLF), 61rps (12RLF), 51rps (15RLS), for a minute.

( Table3 : Compressor frequency )

Operating
frequency

9RLF

X zone

J zone

Y zone

37rps

28rps

0rps

12RLF

X zone

J zone

Y zone

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

Room Room
temperature temperature

Ts+3°F

(Ts+1.5°C)

Ts-1°F

(Ts-0.5°C)

Ts+1°F

(Ts+0.5°C)

Ts-3°F

(Ts-1.5°C)

X zone

J zone

Y zone

Operating
frequency

33rps

25rps

0rps

15RLS

X zone

J zone

Y zone

Operating
frequency

29rps

18rps

0rps

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 64°F(18°C) and 88°F(30°C) in 2°F(1°C) steps.

Operation flow chart

START

Room temp.

>Ts+4°F(2°C)?

NO

YES

YES

or operation command other than

Room temp.

<Ts- 4°F(2°C)?

HEATING OPERATION

Thermostat remains

in OFF state for 6 minutes or

longer?

System stops

auto changeover operation?

NO

YES

NO

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

NO

YES

YES

01-03

5. INDOOR FAN CONTROL

1. Fan speed

( Table4 : Indoor Fan Speed )

Operation mode Air flow mode

Heating

Cooling/ Fan

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

Speed (rpm)

ASU9RLF ASU12RLF ASU15RLS

1330
1290
1160

980
710
600

480
1330
1160

930

680

X zone: 680

J zone: 660

1500
1360
1230
1050

770
600

480
1440
1230
1000

750

X zone: 750

J zone: 730

3. COOLING OPERATION

Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature,
as shown in Figure3.
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 Table4.

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

TR-Ts > 5°F

=

(2.5°C)

5°F > TR-Ts > 3°F

(2.5°C) (1.5°C)

3°F > TR-Ts

(1.5°C)

=

TR-Ts > 4°F

4°F > TR-Ts > 2°F

(2°C) (1°C)

2°F > TR-Ts

(1°C)

(2°C)

=

HIGH mode

MED mode

LOW mode

When the room
temperature drops

When the room
temperature rises

TR : Room temperature
Ts : Setting temperature

4. DRY OPERATION

Refer to th
During the d

eT

a

ble4.

ry mode operation, the fan speed sett

ing c

an not be

c

hange

d

.

01-04

5. HEATING OPERATION

Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature,
as shown in Figure4.

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 Table4.

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

TR-Ts > -2°F

=

(-1°C)

-2°F > TR-Ts > -4°F

(-1°C) (-2°C)

=

-4°F > TR-Ts

(-2°C)

When the room
temperature rises

LOW mode

MED mode

MED+ mode

When the room
temperature drops

TR-Ts > -3°F

=

-3°F > TR-Ts > -5°F
(-1.5°C) (-2.5°C)

-5°F > TR-Ts

(-2.5°C)

(-1.5°C)

=

TR : Room temperature
Ts : Setting temperature

6. COOL AIR PREVENTION CONTROL (Heating mode)

The maximum value of the indoor fan speed is set as shown in Figure5, based on the detected
temperature by the indoor heat exchanger sensor on heating mode.

(Fig.5 : Cool Air Prevention Control)

Indoor heat exchanger
temperature

107.6°F (42°C)

102.2°F (39°C)

98.6°F (37°C)

86°F (30°C)

Hi

Me+

Lo

Cool air
prevention

S-Lo

Indoor heat exchanger
temperature

98.6°F (37°C)

93.2°F (34°C)

89.6°F (32°C)

75.2°F (24°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 Figure6.

( 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

( Table5 : Indoor fan speed )

Dry

X zone J zone

ASU9/ 12RLF 680rpm 660rpm

ASU15RLS 750rpm 730rpm

Y zone

0 480rpm

0 480rpm

Cooling

480rpm

480rpm

(SEC)

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.

( Table6 : Type of Motor )

AC Motor DC Motor

ASU9/ 12RLF,15RLS

2. Fan Speed

( Table7 : Outdoor fan speed )

Zone

Cooling Heating

(rpm)

Dry

Y

Z

860/ 780/ 760/ 470

860/ 470/ 330

ASU9RLF

F

G

ASU12RLF

Y

Z

F

G

Y

Z

850/ 750/ 670/ 500

850/ 500/ 350

1050/ 1010/ 870/ 720/ 530

870/ 530/ 300

ASU15RLS

F

G

300/ 250

250/ 200

Refer to Fig.7

( Fig.7 : Outside air temperature zone selection )

Outside air
temperature

69.8°F (21°C)

53.6°F (12°C)

35.6°F ( 2°C)

Y zone

Z zone

F zone

G zone

230

150

330

230

Outside air
temperature

66.2°F (19°C)

50°F (10°C)

32°F ( 0°C)

900/ 760/ 720/ 680/ 470

950/ 850/ 750/ 680/ 550/ 450

1100/ 850/ 780/ 590/ 480

760/ 470

760/ 470

530

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

*

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

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

*

as table8 without relating to the compressor frequency.

( Table8 : Outdoor fan speed after the defrost )

ASU9RLF 900rpm

ASU12RLF 950rpm

ASU15RLS 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 Air flow Direction Setting:

,,,,, :DuringHeating/Cooling/Drymodes

Air Direction RangeFig.8 :

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.

Cooling / Dry mode

Horizontal flow

Heating mode Downward flow

During AUTO mode operation, for the first a few minutes after beginning operation,
air-flow will be horizontal 1; the air direction cannot be adjusted during this period.
The air flow direction setting will temporarily become 1 when the temperature of the air -flow is
low at the start of the Heating mode.

2. SWING OPERATION

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

(Table9 : Swinging Range)

Range

Cooling / Dry mode
Fan mode ( )

Heating mode
Fan mode ( )

The SWING operation may stop temporarily when the air conditioner’s fan is not operating,
or when operating at very low speeds.

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 table10.

(Table10 : Compressor Operation Frequency Range)

Cooling Heating

Min Max Min Max Min Max

ASU9RLF

ASU12RLF

ASU15RLS 15rps 80rps 15rps 119rps 18rps 29rps

22rps 79rps 22rps 99rps 28rps 37rps

18rps 96rps 18rps 130rps 25rps 33rps

Dry

2. OPEARTION FREQUENCY CONTROL AT START UP

The compressor frequency soon after the start-up is controlled as shown in the Figure9.

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

Frequency

Frequency
Frequency

Frequency
Frequency
Frequency

(Frequency)

ASU9RLF

ASU12RLF

ASU15RLS

(Time)

ASU9RLF

ASU12RLF

ASU15RLS

Time

Frequency

70rps 82rps 92rps 96rps 96rps 96rps

56rps 74rps 87rps 97rps 108rps 119rps

40rps 57rps 72rps 80rps 101rps 110rps

Time Time

80sec 140sec 200sec 380sec 440sec 440sec

80sec 140sec 200sec 380sec 440sec 500sec

80sec 110sec 140sec 200sec 350sec 410sec

Time Time Time

Frequency

Frequency Frequency

Time Time Time Time

Time

Frequency

Time

Frequency

01-08

9. TIMER OPEARTION CONTROL

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

(Table11 : Timer Setting)

ON TIMER / OFF TIMER PROGRAM TIMER SLEEP TIMER

ASU9/ 12RLF,15RLS

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

Stop 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.

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 2°F(1°C).
It increases the setting temperature another 2°F(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 )

+4°F (2°C)
+2°F (1°C)

Ts

Stop of operation

Set

60min

In the heating operation mode

When the sleep timer is set, the setting temperature is decreased 2°F(1°C).
It decreases the setting temperature another 2°F(1°C) every 30 minutes.
Upon lowering 8°F(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

-2°F (-1°C)

-4°F (-2°C)

-6°F (-3°C)

-8°F (-4°C)

Set

30min

30min

Stop of operation

30min

01-10

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 Table12.
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.

Table12 : The pulse range of the electronic expansion valve control

Operation mode Pulse range

ASU9/ 12RLF

Cooling / Dry mode

Heating mode

Cooling / Dry mode

ASU15RLS

Heating mode

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).

between 60 to 480 pulses.

between 60 to 480 pulses.

between 60 to 480 pulses.

between 45 to 480 pulses.

11. TEST OPERATION CONTROL

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. 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.

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

The compressor won't enter operation status for 2 minutes and 20 seconds 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 2 minutes and 20 seconds later after
the compressor stopped.

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 operation
MINIMUM HEAT operation

01-11

15. MANUAL AUTO OPERATION (Indoor unit body operation)

If MANUAL AUTO Button is set, the operation is controlled as shown in Table13.
If the remote control is lost or battery power dissipated, this function will work without the remote control.

(Table13)

Manual auto operation
OPERATION MODE Auto changeover
FAN CONT. MODE Auto
TIMER MODE Continuous
SETTING TEMP. 75.2°F (24°C)
SETTING LOUVER Standard
SWING
ECONOMY

OFF
OFF

(No timer setting available)

Forced cooling operation
Cooling
Hi

­Room Temp is not controlled
Horizontal
OFF

-

16. FORCED COOLING OPERATION

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.

17. COMPRESSOR PREHEATING

When the outdoor temperature is lower than 68°F(20°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 77°F(25°C) or greater,
preheating is ended.

18. MINIMUM HEAT OPERATION

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

( Table14 )

Mode Heating

Setting temperature 50°F (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.+2°F Setting temp.-2°F

(+1°C) (-1°C)

01-12

20. DEFROST OPERATION CONTROL

1. CONDITION OF STARTING THE DEFROST OPERATION

The defrost operation starts as shown in the following Table 16.

(Table 16 : Condition of starting Defrost Operation)

Normal defrost

Integrating defrost

Less than 25 minutes More than 25 minutes

Does not operate

Compressor integrating operation time

More than 240 minutes
(For continuous operation)

Outdoor heat exchanger temp.
below 26.6°F (-3°C)

Compressor integrating operation time

Outdoor heat exchanger temp. < 1.4°F (-17°C)
(at outside air temp. > 14°F (-10°C))

Outdoor heat exchanger temp. < Outside air temp.- 12.6°F (7°C)
or Outdoor heat exchanger temp. < - 4°F (-20°C)
(at outside air temp. < 14°F (-10°C))

Less than 10 minutes
( For

intermittent operation )

OFF count of the compressor

40 times

=

=

=

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 become as shown in Table 17.

(Table 17 : Defrost Release Condition)

Release Condition

=

Outdoor heat exchanger temperature sensor value is higher than
+60.8°F (+16°C) or Compressor operation time has passed 15 minutes.

01-13

3. 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)

Normal defrost

Outside air temp. > 14°F

Outdoor HEX temp.
Below 1.4°F

(-17°C)

=

(-10°C)

Outside air temp. < 14°F

(-10°C)

Outdoor HEX temp.

- Outside air temp.
Below - 12.6°F(7°C)
or
Outdoor HEX temp.
Below - 4°F(-20°C)

Defrost start

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

Integrating defrost

Intermittent operation Continuous operation

Compressor
OFF count :
40 times

Compressor
integrating
operation:
Over 240 minutes

Outdoor HEX temp.
Below 26.6°F(-3°C)

Outdoor fan : OFF
Compressor speed:0rps
EEV : 480pulse
4-way valve : OFF
Compressor speed : 90rps (09/ 12)

70rps (15)

Outdoor HEX temp.: Over 60.8°F(16°C)

or

Compressor ON time: Maximum 15 minutes

Defrost end

01-14

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 defrost lamp
lighting, 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 24.8°F (-4°C), 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 60.8°F (16°C)
or Compressor operation time has passed 15 minutes.

OFF Defrost Flow Chart

Heating operation stop

Outdoor heat exchanger temperature:
Below 24.8°F(-4°C)
and
Compressor integrating operation:
Over 30 minutes

Defrost start

Defrost Indicater:
[Defrost lamp]
Lighting

Outdoor heat exchanger temperature:
Over 60.8°F (16°C) or
Compressor ON time: Over 15 minutes

Defrost end

01-15