Fujitsu AOU24RLX, AOU42RLX, AUU42RCLX, AUU24RCLX, AOU18RLX User Manual

SPLIT TYPE

ROOM AIR CONDITIONER

CASSETTE type

INVERTER

SERVICE

INSTRUCTION

Models Indoor unit Outdoor unit

AUU18RCLX AOU18RLX

AUU24RCLX AOU24RLX

AUU36RCLX AOU36RLX

AUU42RCLX AOU42RLX

R410A

CONTENTS

1. DESCRIPTION OF EACH CONTROL OPERATION

1. COOLING OPERATION..............................................................................................	01-01
2. HEATING OPERATION..............................................................................................	01-02
3. DRY OPERATION......................................................................................................	01-03
4. AUTO CHANGEOVER OPERATION.........................................................................	01-04
5. INDOOR FAN CONTROL...........................................................................................	01-05
6. OUTDOOR FAN CONTROL.......................................................................................	01-07
7. LOUVER CONTROL...................................................................................................	01-08
8. COMPRESSOR CONTROL........................................................................................	01-09
9. TIMER OPERATION CONTROL................................................................................	01-10
10. ELECTRONIC EXPANSION VALVE CONTROL........................................................	01-12
11. TEST OPERATION CONTROL..................................................................................	01-12
12. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )................................	01-12
13. 4-WAY VALVE EXTENSION SELECT.......................................................................	01-12
14. AUTO RESTART........................................................................................................	01-12
15. PUMP DOWN ( Refrigerant collecting operation )......................................................	01-13
16. COMPRESSOR PREHEATING..................................................................................	01-13
17. DEFROST OPERATION CONTROL..........................................................................	01-13
18. DRAIN PUMP OPERATION.......................................................................................	01-15
19. ENERGY SAVE FUNCTION.......................................................................................	01-15
20. VARIOUS PROTECTIONS.........................................................................................	01-16

2. TROUBLE SHOOTING

2-1	ERROR DISPLAY......................................................................................................		02-01
2-1-1		WIRED REMOTE CONTROLLER DISPLAY......................................................	02-01
2-1-2		OUTDOOR UNIT DISPLAY................................................................................	02-03
2-2	TROUBLE SHOOTING WITH ERROR CODE..........................................................		02-04
2-3	TROUBLE SHOOTING WITH NO ERROR CODE....................................................		02-24
2-4	SERVICE PARTS INFORMATION............................................................................		02-29

3. REPLACEMENT PARTS

1 REPLACEMENT PARTS ( For OUTDOOR UNIT ).......................................................		03-01
1-1 For AOU18/ 24/ 36RLX...........................................................................................		03-01
1-1-1 PARTS LAYOUT DRAWING...............................................................................		03-01
1-1-2 WIRING................................................................................................................		03-03
1-1-3 DISASSEMBLY PROCESS.................................................................................		03-04
1-1-4 ASSEMBLY PROCESS of INVERTER UNIT......................................................		03-09
1-2 For AOU42RLX.......................................................................................................		03-15
1-2-1	PARTS LAYOUT DRAWING...............................................................................	03-15
1-2-2	WIRING................................................................................................................	03-17
1-2-3	DISASSEMBLY PROCESS.................................................................................	03-19
1-2-4	ASSEMBLY PROCESS of INVERTER UNIT......................................................	03-25
2 REPLACEMENT PARTS ( For INDOOR UNIT )...........................................................		03-30
2-1 PARTS LAYOUT DRAWING...................................................................................		03-30

R410A

CASSETTE type

INVERTER

1 . DESCRIPTION OF EACH CONTROL OPERATION

1. COOLING OPERATION

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.

*If the room temperature is 3.6 degF(2 degC) higher than a set temperature, the compressor operation frequency will attain to maximum performance.

*If the room temperature is 3.6 degF(2 degC) lower than a set temperature, the compressor will be stopped.

*When the room temperature is between +3.6 degF(+2 degC) to -3.6 degF(-2 degC) 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.

( Table 1 : Compressor Frequency Range )

	minimum	maximum
	frequency	frequency
AUU18RCLX	20Hz	63Hz
AUU24RCLX	20Hz	80Hz
AUU36RCLX	20Hz	90Hz
AUU42RCLX	25Hz	92Hz

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

Outdoor air					Fan speed mode		Hi	Me	Lo
temperature
			A zone		AUU18RCLX	A zone	63Hz	45Hz	45Hz
87.8°F						B zone	45Hz	35Hz	35Hz
						C zone	35Hz	35Hz	35Hz
(31°C)			B zone
						D zone	35Hz	30Hz	30Hz
66.2°F					AUU24RCLX	A zone	80Hz	55Hz	55Hz
						B zone	55Hz	45Hz	45Hz
(19°C)			C zone
						C zone	45Hz	45Hz	45Hz
51.8°F						D zone	45Hz	35Hz	35Hz
			D zone		AUU36RCLX	A zone	90Hz	75Hz	75Hz
(11°C)
						B zone	75Hz	70Hz	70Hz
						C zone	70Hz	63Hz	63Hz
						D zone	63Hz	55Hz	55Hz
					AUU42RCLX	A zone	92Hz	72Hz	72Hz
						B zone	72Hz	60Hz	60Hz
						C zone	60Hz	60Hz	60Hz
						D zone	60Hz	53Hz	53Hz

01-01

2. HEATING OPERATION

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.

*If the room temperature is lower 5.4 degF(3 degC) than a set temperature, the compressor operation frequency will attain to maximum performance.

*If the room temperature is higher 3.6 degF(2 degC) than a set temperature, the compressor will be stopped.

*When the room temperature is between +3.6 degF(+2 degC) to -5.4 degF(-3 degC) 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 outdoor temperature.

( Table 2 : Compressor Frequency Range )

	minimum	maximum
	frequency	frequency
AUU18RCLX	20Hz	87Hz
AUU24RCLX	20Hz	87Hz
AUU36RCLX	20Hz	95Hz
AUU42RCLX	23Hz	92Hz

( Fig.2 : Limit of Maximum Frequency based on Outdoor Temperature )

Outdoor air							Limit of Maximum
							Frequency
temperature
			E zone		AUU18RCLX	A zone	87Hz
68°F						B zone	85Hz
						C zone	70Hz
(20°C)			D zone
						D zone	70Hz
60.8°F						E zone	60Hz
					AUU24RCLX	A zone	87Hz
(16°C)			C zone
						B zone	85Hz
53.6°F						C zone	70Hz
						D zone	70Hz
(12°C)
			B zone			E zone	60Hz
41°F					AUU36RCLX	A zone	95Hz
						B zone	95Hz
			A zone
(5°C)
						C zone	90Hz
						D zone	80Hz
						E zone	80Hz
					AUU42RCLX	A zone	92Hz
						B zone	92Hz
						C zone	90Hz
						D zone	80Hz
						E zone	80Hz

01-02

3. DRY OPERATION

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 Table 3.

( Table 3 : Compressor frequency )

	Operating frequency
AUU18RCLX	25Hz
AUU24RCLX	30Hz
AUU36RCLX	45Hz
AUU42RCLX	30Hz

( Fig.3 : Compressor Control based on Room Temperature )

Room		Room
temperature		temperature
	Compressor ON		Ts+2.7 degF
Ts+1.8 degF			(1.5 degC)
(1 degC)	Compressor OFF
			Ts : Setting temperature

( Fig.4 : Indoor Fan Control )

Compressor

ON

OFF

Indoor fan

air flow mode

ON

OFF

30	5	30	120	5	(sec)
			180	180

Air flow mode : Lo

01-03

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 and MONITORING modes. During operation, the optimum mode is automatically swiched in accordance with temperature changes. The temperature can be set between 64°F(18°C) and 88°F(30°C) in 2 degF(1 degC) steps.

1When operation starts, only the indoor fan is operated for 1 minute. (Air flow mode: S- Lo) After 1 minute, depends on the room temperature and outdoor unit's operarion mode, the operation mode is selected in accordance with the table below.

( Table 4 : Operation mode selection table )

Room temperature :TR				Operation mode
TR > Ts +3.6 degF				Cooling
=	(2 degC)
Ts +3.6 degF > TR > Ts-3.6 degF				Monitoring
(2 degC)			(2 degC)
Ts +3.6 degF > TR				Heating
(2 degC)		=
Ts : Setting temperature

2When COOLING was selected at 1 , the same operation as COOLING OPERATION is performed.

3When HEATING was selected at 1 , the same operation as HEATING OPERATION is performed.

4When the compressor was stopped for 6 consecutive minutes by the temperature control function after the COOLING or HEATING operation mode was selected at 1 above, operation is switched to MONITORING and the operation mode is selected again.

01-04

5. INDOOR FAN CONTROL

1. Fan speed

( Table 5 : Indoor Fan Speed )

AUU18RCLX

AUU24RCLX

Operation mode	Air flow mode	Speed (rpm)
Heating	Hi	400
	Me	350
	Lo	310
	S-Lo	250
Cooling	Hi	450
	Me	390
	Lo	330
	S-Lo	250

AUU36RCLX

Operation mode	Air flow mode	Speed (rpm)
Heating	Hi	580
	Me	510
	Lo	440
	S-Lo	300
Cooling	Hi	580
	Me	510
	Lo	440
	S-Lo	300

Operation mode	Air flow mode	Speed (rpm)
Heating	Hi	440
	Me	380
	Lo	330
	S-Lo	250
Cooling	Hi	490
	Me	430
	Lo	360
	S-Lo	250

AUU42RCLX

Operation mode	Air flow mode	Speed (rpm)
Heating	Hi	620
	Me	550
	Lo	470
	S-Lo	300
Cooling	Hi	620
	Me	550
	Lo	470
	S-Lo	300

2. FAN OPERATION

The airflow can be switched in 4 steps such as AUTO, LOW, MED, HIGH, while the indoor fan only runs.

When [AUTO] is selected, the indoor fan motor runs LO and OFF at 1 minute intervals.

3. COOLING OPERATION

Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature, as shown in Figure 5.

On the other hand, if switched in [HIGH] [LOW], the indoor motor will run at a constant airflow of [COOL] operation modes LOW, MED, HIGH,as shown in Table 5.

( Fig.5 : Airflow change - over ( Cooling : AUTO ) )

*1 When the room temperature rises

TR-Ts > 3.6 degF = (2 degC)

3.6 degF > TR-Ts >		1.8 degF
(2 degC)	=	(1 degC)

1.8 degF > TR-Ts (1 degC)

HIGH mode

MED mode

LOW mode

When the room temperature drops

=(3 degC)

5.4degF > TR-Ts > 3.6 degF

=(2 degC)TR-Ts > 5.4 degF(3 degC)

3.6 degF > TR-Ts (2 degC)

TR : Room temperature Ts : Setting temperature

*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.

01-05

4. HEATING OPERATION

When the airflow is set to [AUTO], the indoor fan motor operates [MED] mode.

Then the indoor fan motor will run according to a room temperature, as shown in Figure 6.

On the other hand, if switched in [HIGH] [LOW], the indoor motor will run at a constant airflow

of [COOL] operation modes LOW, MED, HIGH, as shown in Table 5.

( Fig.6 : Airflow change - over ( Heating : AUTO ) )

Indoor heat exchanger temperature

	116.6°F	Go up one-step
	(47°C)
		Hold
	105.8°F
	(41°C)	Go down one-step

5. COOL AIR PREVENTION CONTROL (Heating mode)

The maximum value of the indoor fan speed is set as shown in Figure 7, based on the detected temperature by the indoor heat exchanger sensor on heating mode.

( Fig.7 : Cool Air Prevention Control )

Indoor heat exchanger	Indoor heat exchanger
temperature	temperature

	SETTING
91.4°F	FAN MODE
(33°C)		86°F
86°F	LO mode	(30°C)
	S-LOW mode
(30°C)

6. DRY OPERATION

Refer to the Figure 4.

During the dry mode operation, the fan speed setting can not be changed.

01-06

6. OUTDOOR FAN CONTROL

1. Outdoor Fan Motor

Following table shows the fan speed of the outdoor unit.

( Table 6 : Fan speed of the outdoor unit )

			Cooling	Heating
	AUU18RCLX		780/ 400/ 250/ 220/ 200 rpm	780/ 400/ 250/ 220/ 200 rpm
	AUU24RCLX		900/ 850/ 780/ 400/ 250/ 220/ 200 rpm	900/ 780/ 400/ 250/ 220/ 200 rpm
	AUU36RCLX
	AUU42RCLX	Upper fan	850/ 780/ 400/ 350/ 300 rpm	900/ 850/ 780/ 350/ 200/ 170/ 150 rpm
		Lower fan	780/ 750/ 350/ 0 rpm	850/ 780/ 750/ 350/ 200/ 170/ 150 rpm

*AUU42RCLX has two fan motors.

*The outdoor fan speed changs in the range mentioned avobe 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.)

*For AUU18RCLX

It runs at 250rpm for 20 seconds after starting up the outdoor fan.

When the outdoor heat exchanger tenperature is lower than 35.6°F (2°C), the fan speed switches to 780rpm on heating mode.

*For AUU24RCLX / AUU36RCLX

It runs at 250rpm for 20 seconds after starting up the outdoor fan.

When the outdoor heat exchanger tenperature is lower than 35.6°F (2°C), the fan speed switches to 900rpm on heating mode.

*For AUU42RCLX

It runs at 500rpm for 20 seconds after starting up the outdoor fan.

When the outdoor heat exchanger tenperature is lower than 35.6°F (2°C),

the fan speed switches to 900rpm(Upper fan) and 850rpm(Lower fan) on heating mode.

01-07

7. LOUVER CONTROL

1. VERTICAL LOUVER CONTROL

(Function Range)

Each time the button is pressed, the air direction range will change as follows:

		(Fig.8 : Air Direction Range)
	(Operation Range)
	Cooling / Dry mode	1
	Heating mode	2
		3
	Fan mode
		4

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

For AUU18/ 24RCLX

At the start of operation if the setting louver position is ,the setting position is set to after the louver moves from totally-enclosed position to . (Positioning Control)

For AUU36/ 42RCLX

At the start of operation if the setting louver position is or ,the setting position is set to or after the louver moves from totally-enclosed position to . (Positioning Control)

The indoor fan motor starts after the louver reaches to the setting position.

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.

(Swinging Range)

Airflow direction set Range of swing

to

to

to

to

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.)

01-08

8. COMPRESSOR CONTROL

1. OPERATION FREQUENCY RANGE

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

(Table 7 : Compressor Operation Frequency Range)

	Cooling				Heating		Dry
	Min		Max	Min		Max
AUU18RCLX	20Hz		63Hz	20Hz		87Hz	25Hz
AUU24RCLX	20Hz		80Hz	20Hz		87Hz	30Hz
AUU36RCLX	20Hz		90Hz	20Hz		95Hz	45Hz
AUU42RCLX	25Hz		92Hz	23Hz		92Hz	30Hz

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)

Frequency
Hold	1
Frequency		2
Time A	Time B	Time C	Time D

		Time E
(Frequency)
	Frequency	Frequency
AUU18RCLX	40Hz	56Hz
AUU24RCLX
AUU36RCLX
AUU42RCLX	56Hz	70Hz

(Time)

For AUU18/ 24/ 36RCLX
1	Discharge pipe temp. > 50°F (10°C) ,86°F (30°C)
	=	(Heating)
	(Cooling)
2	Discharge pipe temp. < 50°F (10°C) ,86°F (30°C)
	(Cooling)	(Heating)
For AUU42RCLX
1	Discharge pipe temp. > 50°F (10°C) ,95°F (35°C)
	=	(Heating)
	(Cooling)
2	Discharge pipe temp. < 50°F (10°C) ,95°F (35°C)
	(Cooling)	(Heating)

	Time A	Time B	Time C	Time D	Time E
AUU18RCLX	180sec	60sec	120sec	120sec	720sec
AUU24RCLX
AUU36RCLX
AUU42RCLX	180sec	80sec	180sec	180sec	720sec

01-09

9. TIMER OPERATION CONTROL

9-1 Wired Remote Controller

AR-3TA14

ON / TIMER

OFF / TIMER

WEEKLY TIMER

TEMPERATURE SET BACK TIMER

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. WEEKLY TIMER

2-1. WEEKLY TIMER

Use this timer function to set operating time for each day of the week. The weekly timer allows up to two ON and OFF time to set up per day.

Operation mode	Operation mode	Operation mode
Stop mode		Stop mode	Stop mode
Set time	Set time	Set time	Set time

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.

01-10

2-2. DAY OFF setting

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

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.

Normal

DAY OFF

Operation mode

Operation mode

Stop mode

Stop mode

Stop mode

Preceding day

Setting day

Next day

Next day setting

DAY OFF

Operation mode

Operation mode

Stop mode

Stop mode

Stop mode

Preceding day

Setting day

Next day

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

3. TEMPERATURE SET BACK TIMER

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 64°F(18°C) even if the SET BACK temperature is set to 62°F(17°C) or lower.

Case of SET BACK timer on the Cooling operation.

( Setting temperature :72°F(22°C), SET BACK temperature :80°F(26°C))

ON

OFF

ON

OFF

	SET BACK setting
	Operation	80°F(26°C)
	temperature	72°F(22°C)
	*1	80°F(26°C)
	Operation	76°F(24°C)
	temperature
		72°F(22°C)

*1: During the SET BACK function,

the setting temperature is changed. Chenge the setting temperature: 72°F(22°C) 76°F(24°C)

01-11

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 following values.

The compressor frequency, the temperatures detected by the discharge temperature sensor and the outdoor temperature sensor.

The pulse range of the electronic expansion valve control is between 50 to 480 pulses.

At the time of supplying the power to the outdoor unit, the initialization of the electronic expansion valve is operated (1000 pulses are input to the closing direction).

11. TEST OPERATION CONTROL

With Wired Remote Controller

Under the condition where the air conditioner stops, press the MASTER CONTROL button and the FAN CONTROL button simultaneously for 5 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.

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

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

13. 4-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 4-way valve is switched in 3 minutes 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 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

Air flow Direction

Swing

Thermistor detected position

01-12

15. PUMP DOWN ( Refrigerant collecting operation )

Perform the following procedures to collect the refrigerant when moving the indoor unit or the outdoor unit.

When the product is stopped:

1.Press the PUMP DOWN switch (SW2) on the outdoor unit.

(The LED on the outdoor unit circuit board flickers every 1second.)

2.The pump down operation (cooling operation) begins right away. After operation starts, close the 3-way valve (liquid).

3.After 2-3minutes, operation stops. Close the 3-way valve (gas) within 1minute after operations stops.

4.The LED will go out 3minutes after it stops. Disconnect the power supply after confirming that the LED has gone out.

When the product is operating:

1.Press the PUMP DOWN switch (SW2) on the outdoor unit. The LED on the outdoor unit circuit board flickers every 1second, and operation stops.

At this point, recovery has not been completed, so do not close the 2 and 3-way valves.

2.The pump down operation (cooling operation) begins after 3minutes. Close the 3-way valve (liquid) after operation starts.

3.After 2-3minutes, operation stops. Close the 3-way valve (gas) within 1minute after operations stops.

4.The LED will go out 3minutes after it stops. Disconnect the power supply after confirming that the LED has gone out.

16.COMPRESSOR PREHEATING

When the outdoor heat exchanger temperature is lower than Operation temperature (Refer to Table 8) and the heating operation has been stopped for 3 hours, 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 Release temperature or greater, preheating is over.

(Table 8 : Preheating Operation / Release Temperature)

	Before 24 hour		After 24 hour
	Operation	Release	Operation	Release
	temperature	temperature	temperature	temperature
AUU18RCLX	37.4°F	44.6°F	32°F	39.2°F
AUU24RCLX
AUU36RCLX	(3°C)	(7°C)	(0°C)	(4°C)
AUU42RCLX

17. DEFROST OPERATION CONTROL

1.CONDITION OF STARTING THE DEFROST OPERATION

The defrost operation starts when the outdoor heat exchanger temperature sensor detects the temperature lower than the values shown in Table 9.

(Table 9 : Condition of starting Defrost Operation)

		Compressor integrating
Compressor integrating		operation :45min and over		Outdoor temp. -	Outdoor heat
operation :Less than 45min.		Less than 6 min. *1	After 6 min. *1	Outdoor heat exchanger temp.	exchanger temp.
		or 10min. *2	or 10min. *2

AUU18RCLX

AUU24RCLX

17.6°F(-8°C) *3

AUU36RCLX

Does not operate

14°F (-10°C) *4

AUU42RCLX

21.6 degF (12 degC)

- 4°F (-20°C)

*1. It means contiguous operation time.

*3. Outdoor temp. > 30.2°F (-1°C)

=

*2. Compressor stop time: Below 20min.

Select 6min. *4. Outdoor temp. < 30.2°F (-1°C)

Above 20min.

Select 10min.

2.CONDITION OF THE DEFROST OPERATION COMPLETION

Defrost operation is released when the conditions become as shown in Table 10.

(Table 10 : Defrost Release Condition)

	Release Condition
AUU18RCLX
AUU24RCLX	Outdoor heat exchanger temperature sensor value is higher than 53.6°F(12°C) or
AUU36RCLX	Compressor operation time has passed 15 minutes.
AUU42RCLX
	01-13

3. Defrost Flow Chart

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

Heating operation start : Compressor ON

(Not defrosted for 6 or 10 minutes)

AUU18/ 24/ 36RCLX

AUU42RCLX

Compressor integrating

Compressor integrating

operation:

operation:

45 minutes and over

45 minutes and over

Outdoor temp. > 30.2°F

Outdoor temp. < 30.2°F

Outdoor temp. > 30.2°F

Outdoor temp. < 30.2 F

= (-1°C)

(-1°C)

= (-1°C)

(-1°C)

Outdoor heat exchanger

Outdoor heat exchanger

Outdoor heat exchanger

Outdoor heat exchanger

temperarure:

temperarure:

temperarure:

temperarure:

Below 17.6°F (-8°C)

Below 14°F (-10°C)

Below 17.6°F (-8°C)

Below 14°F (-10°C)

Outdoor temp - Outdoor heat exchanger temperature:

Above 21.6 degF (12 degC)

Outdoor heat exchanger temperarure:

Below - 4°F (-20°C)

Defrost start	Defrost start
Defrost Indicator:	Defrost Indicator:
[Operation lamp]	[Operation lamp]
9 sec ON / 1 sec OFF	9 sec ON / 1 sec OFF

3 sec later Compressor OFF

3 sec later Outdoor fan motor OFF 28 sec later 4-way valve OFF

34 sec later compressor ON (Frequency : 92 Hz)

Outdoor heat exchanger temperature: Over 53.6°F (12°C) or

Compressor ON time: Over 15 minutes

Compressor : 30 Hz

Outdoor fan motor OFF

4-way valve OFF Compressor ON (Frequency : 92 Hz)

Defrost end

01-14

18. DRAIN PUMP OPERATION

During Cooling / Dry operation

1.When the compressor starts, the drain pump starts simultaneously.

2.The drain pump operates continuously for 3 minutes after the compressor is turned off.

3.When the compressor stops by the "Indoor heat exchanger de-icing function", the drain pump is turned off in 1 hour after the compressor stops.

4.When the water level in the drain pan rises up and then the float switch functions:

1The compressor, indoor and outdoor fan motor operation are stopped.

2Drain pump operates continuously for 3 minutes after the float switch is turned off. (Almost condensing water may be drained)

5.When the float switch turns ON continuously for 3 min., "FAILURE INDICATION" operates.

6.When the float switch turns OFF within 3 min., the unit starts cooling operation.

During Heating / Fan / Stop operation

1.When the water level in the drain pan rises up and then the float switch functions:

1Drain pump operates continuously for 3 minutes after the float switch is turned off. (Almost condensing water may be drained)

2.When the float switch turns ON continuously for 3 min., "FAILURE INDICATION" operates.

19.ENERGY SAVE FUNCTION

1.During Cooling / Dry operation:

The thermostat temperature setting increases by 1.8 degF (1 degC) as soon as the ENERGY SAVE button is pressed, and then increases by 1.8 degF (1 degC) after 1 hour later.

Afterwards, energy consumption is saved by continuing to cool or dry at a thermostat temperature of 3.6 degF (2 degC) higher than setting temperature.

ENERGY	1hour.
SAVE ON

				3.6 degF (2 degC)
		1.8 degF
					Setting
		(1 degC)
					temperature

2.During Heating operation:

The thermostat temperature setting decreases by 1.8 degF (1 degC) as soon as the ENERGY SAVE button is pressed, and then decreases by another 1.8 degF (1 degC) every 30 minutes.

Afterwards, energy consumption is saved by continuing to heat at a thermostat temperature of 7.2 degF (4 degC) lower than setting temperature.

1.8degF 3.6degF 5.4degF 7.2degF

(1degC) (2degC) (3degC) (4degC) Setting temperature

ENERGY

SAVE ON 30min.

1 hour.

1 hour

30 min.

01-15

20. VARIOUS PROTECTIONS

1. DISCHARGE GAS TEMPERATURE OVER RISE PREVENTION CONTROL

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

When the discharge temperature becomes higher than Temperature ,the compressor frequency is decreased 10 Hz, and it continues to decrease the frequency for 10 Hz 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 stops.
When the discharge temperature becomes lower than Temperature					,the compressor operates.
(Table 11 : Discharge Temperature Over Rise Prevention Control / Release Temperature)
		Temperature	Temperature	Temperature		Temperature
	AUU18RCLX
	AUU24RCLX	221°F (105°C)	212°F (100°C)	239°F (115°C)		176°F (80°C)
	AUU36RCLX
	AUU42RCLX

2.CURRENT RELEASE CONTROL

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 12 : Current Release Operation Value / Release Value)

[ Heating ]

AUU18RCLX				Outdoor unit fan speed
			780 rpm	400 rpm	250 rpm	220, 200 rpm
T0	> 68°F (20°C)		10.0A / 9.5A
	=			10.0A / 9.5A	8.0A / 7.5A	6.0A / 5.5A
T0	< 68°F (20°C)		12.0A / 11.5A
T0: Outdoor temperature
AUU24RCLX				Outdoor unit fan speed
			900, 780 rpm	400 rpm	250 rpm	220, 200 rpm
T0	> 68°F (20°C)		10.0A / 9.5A
	=			10.0A / 9.5A	8.0A / 7.5A	6.0A / 5.5A
T0	< 68°F (20°C)		12.0A / 11.5A
T0: Outdoor temperature
AUU36RCLX				Outdoor unit fan speed
			900 rpm	780 rpm	400 rpm	250 rpm	220 ,200 rpm
T0	> 53.6°F (12°C)		15.0A / 14.5A	15.0A / 14.5A	13.0A / 12.5A	10.0A / 9.5A	8.0A / 7.5A
	=
53.6°F > T0 > 41°F
(12°C)		= (5°C)	18.0A / 17.5A
T0	< 41°F (5°C)			18.0A / 17.5A	18.0A / 17.5A	18.0A / 17.5A	18.0A / 17.5A

T0: Outdoor temperature

01-16

AUU42RCLX			Outdoor unit fan speed
	Upper fan	900 ,850 ,780 ,350 rpm		200 rpm	170 rpm	150 rpm
	Lower fan	850 ,780 ,750 ,350 rpm		200 rpm	170 rpm	150 rpm
T0 > 53.6°F (12°C)		20.0A / 19.5A		15.0A / 14.5A	12.0A / 11.5A	12.0A / 11.5A
=
T0 < 53.6°F (12°C)		20.0A / 19.5A		20.0A / 19.5A	20.0A / 19.5A	20.0A / 19.5A

T0: Outdoor temperature

[ Cooling ]

AUU18RCLX						Outdoor unit fan speed
					780 rpm	400 rpm	250 rpm	220, 200 rpm
T0 > 113°F (45°C)					8.0A / 7.5A	8.0A / 7.5A	5.0A / 4.5A	4.0A / 3.5A
=
113°F > T0 > 77°F
(45°C)	=(25°C)				10.0A / 9.5A
77°F > T0 > 66.2°F					12.0A / 11.5A	12.0A / 11.5A	7.0A / 6.5A
(25°C)	=	(19°C)
66.2°F > T0 > 55.4°F							8.0A / 7.5A
(19°C)		=	(13°C)
55.4°F > T0 > 44.6°F							8.5A / 8.0A	5.0A / 4.5A
(13°C)		=	(7°C)
44.6°F > T0 > 32°F							9.0A / 8.5A	6.5A / 6.0A
(7°C)		=	(0°C)
T0 < 32°F (0°C)								7.5A / 7.0A
T0: Outdoor temperature
AUU24RCLX						Outdoor unit fan speed
					900 ,850 rpm	780 rpm	400 rpm	250 rpm	220, 200 rpm
T0 > 113°F (45°C)					8.0A / 7.5A	8.0A / 7.5A	8.0A / 7.5A	5.0A / 4.5A	4.0A / 3.5A
=
113°F > T0 > 100.4°F
(45°C)	=		(38°C)		10.0A / 9.5A	10.0A / 9.5A
100.4°F > T0 > 77°F					12.0A / 11.5A
(38°C)		=		(25°C)
77°F > T0 > 66.2°F						12.0A / 11.5A	12.0A / 11.5A	7.0A / 6.5A
(25°C)	=	(19°C)
66.2°F > T0 > 55.4°F
(19°C)		=	(13°C)					8.0A / 7.5A
55.4°F > T0 > 44.6°F
(13°C)		=	(7°C)					8.5A / 8.0A	5.0A / 4.5A
44.6°F > T0 > 32°F								9.0A / 8.5A	6.5A / 6.0A
(7°C)		=	(0°C)
T0 < 32°F (0°C)									7.5A / 7.0A
T0: Outdoor temperature

01-17

AUU36RCLX					Outdoor unit fan speed
				900 ,850 rpm	780 rpm		400 rpm		250 rpm	220, 200 rpm
T0 > 113°F (45°C)				10.0A / 9.5A	10.0A / 9.5A		10.0A / 9.5A		7.0A / 6.5A	5.5A / 5.0A
=
113°F > T0 > 100.4°F
(45°C)	=		(38°C)	14.0A / 13.5A	14.0A / 13.5A
100.4°F > T0 > 66.2°F				18.0A / 17.5A
(38°C)	=
	(19°C)
66.2°F > T0 > 55.4°F					15.0A / 14.5A		15.0A / 14.5A
(19°C)	=		(13°C)							7.0A / 6.5A
55.4°F > T0 > 44.6°F
(13°C)	=		(7°C)						12.0A / 11.5A
44.6°F > T0 > 32°F
(7°C)	=		(0°C)
T0 < 32°F (0°C)										9.5A / 9.0A
T0: Outdoor temperature
AUU42RCLX					Outdoor unit fan speed
		Upper fan		850 rpm	780 rpm		350 rpm		400 rpm	350, 300 rpm
		Lower fan		750 rpm	780 rpm		350 rpm		0 rpm	0 rpm
T0 > 113°F (45°C)				12.0A / 11.5A	12.0A / 11.5A		12.0A / 11.5A		12.0A / 11.5A	12.0A / 11.5A
=
113°F > T0 > 87.8°F
(45°C)	=		(31°C)	20.0A / 19.5A	20.0A / 19.5A
87.8°F > T0 > 77°F							18.0A / 17.5A
(31°C)	=		(25°C)
77°F > T0 > 66.2°F									18.0A / 17.5A
(25°C)	= (19°C)
66.2°F > T0 > 55.4°F
(19°C)	=		(13°C)				20.0A / 19.5A			15.0A / 14.5A
T0 < 55.4°F (13°C)										18.0A / 17.5A
T0: Outdoor temperature

01-18

3.ANTI-FREEZING CONTROL (Cooling mode)

The compressor frequency decreases on cooling mode when the indoor heat exchanger temperature sensor detects the temperature lower than 37.4°F (3°C).

Then, the anti-freezing control is released when it becomes higher than 42.8°F (6°C).

(Fig 10 : Anti-freezing Protection Operation / Release Temperature)

Indoor heat exchanger temperature

The compressor frequency is

decreased 10Hz every 120seconds.

37.4°F

(3°C)

Hold

42.8°F

(6°C) Compressor OFF : Hold

Compressor ON : Release of protection

53.6°F

(12°C)

Release of protection

When the compressor frequency becomes lower than minimum frequency, the compressor operates at minimum frequency.

If the indoor heat exchanger temperature sensor detects the temperature lower than 37.4°F (3°C) after 2minutes upon operating the compressor at minimum frequency, the compressor stops.

4.COOLING PRESSURE OVER RISE PROTECTION

When the outdoor unit heat exchange sensor temperature rises to 158.9°F (70.5°C) or greater, the compressor is stopped and error display is indicated.

5.HIGH TEMPERATURE RELEASE CONTROL ( HEATING MODE )

On heating mode, the compressor frequency is controlled as following based on the detection value of the indoor heat exchanger temperature sensor.

(Fig 11 : Heating Overload Protection Control)

Indoor heat exchange temperature

Compressor is OFF

145.4°F

(63°C)

The compressor frequency is decreased 10Hz every 60seconds.

129.2°F

(54°C)

Hold

122°F

(50°C)

Compressor OFF : Release of protection

Compressor ON :

The compressor frequency is increased 10Hz every 60seconds.

01-19

R410A

CASSETTE type

INVERTER

2 . TROUBLE SHOOTING

2. TROUBLESHOOTING

2-1 ERROR DISPLAY

2-1-1 WIRED REMOTE CONTROLLER DISPLAY

1.SELF - DIAGNOSIS

When the error indication "E:EE" is displayed, inspection of the air conditioning system is necessary. Please consult authoilzed servise personnel.

Run [Self-Diagnosis] if [E:EE] flashes on the clock display of the remote controller.

Display						Error code
SU MO	TU WE TH FR	SA				SU MO TU WE TH FR SA
						Ex. Self-diagnosis
	DAY			DAY
CLOCK ADJUST	DAY OFF	ENERGY	CLOCK ADJUST	DAY OFF	ENERGY	THERMO
SET BACK		SAVE	SET BACK	SET	SAVE	SENSOR
DELETE	SET		DELETE	SET
1. Stop the air conditioner operation.
2. Press the SET TEMPERATURE buttons			and	simultaneously for 5 seconds or more
to start the self-diagnosis.

3. Press the SET TEMPERATURE buttons and or there is no key input for 20 seconds to stop the

simultaneously for 5 seconds or more self-diagnosis.

Error code	Error contents				Trouble
					shooting
	Communication error (indoor unit			remote control)	1
	Communication error (Serial reverse transfer error)				2
	Room temperature sensor open				3
	Room temperature sensor short-circuited
	Indoor heat exchanger temperature sensor open				4
	Indoor heat exchanger temperature sensor short-circuited
	Outdoor heat exchanger temperature sensor error				5
	Water drain abnormal				6
	Outdoor temperature sensor error				7
	Outdoor discharge pipe temperature sensor error				8
	Indoor EEPROM abnormal (Model No.)				9
	Indoor fan motor abnormal				10
	Outdoor communication signal error (Forward transfer signal error)				11
	Compressor temperature sensor error				12
	Pressure switch error				13
	IPM error				14
	CT error				15
	Active filter module (AFM) error				16
	Compressor rotor location cannot detect (permanent stop)				17
	Outdoor unit fan motor error				18

02-01

2. ERROR CODE HISTORY DISPLAY

Up to 16 memorized error codes may be displayed for the indoor unit connected to the remote controller.

1. Stop the air conditioner operation.

2. Press the SET TEMPERATURE buttons ,	and the START/STOP button simultaneously
for 5 seconds or more to start the self-diagnosis.

DAY	SU MO TU WE TH FR SA

3. Press the START/STOP button.

DAY	SU MO TU WE TH FR SA

Error code

Error history number

4. Press the SET TEMPERATURE button to select the error history number.

	DAY
Lower	Raise

0				1				2 ı			3				4			5			6			7
F				E				d			c				b			A		9			8

5. Press the SET TEMPERATURE buttons , and START/STOP button simultaneously for 5 seconds or more or there is no key input for 20 seconds to stop the display.

02-02

2-1-2 OUTDOOR UNIT DISPLAY

1. ERROR DISPLAY

	Error contents	LED Flashing	Display	Trouble
		Pattern	priority	shooting
	Outdoor communication signal error	1 time flash	1	11
	(Forward transfer signal error)
	Outdoor discharge pipe temperature sensor error	2 times blink	2	8
	Outdoor heat exchanger temperature sensor error	3 times blink	3	5
	Outdoor temperature sensor error	4 times blink	4	7
	Compressor temperature sensor error	7 times blink	5	12
	Heat sink temperature sensor error	8 times blink	6	19
	Pressure switch abnormal	9 times blink	7	13
	IPM error	12 times blink	8	14
	Compressor rotor location cannot detect	13 times blink	9	17
	Compressor Start-up error	14 times blink	10	20
	Outdoor unit fan motor error (upper fan)	15 times blink	11	18
	Outdoor unit fan motor error (lower fan)	16 times blink	12

2.ERROR DISPLAY METHOD

Outdoor LED Blink (1 to 16 times) 0.5sec ON / 0.5sec OFF blinking

0.5sec

0.5sec

2sec

ON

OFF

3. NORMAL OPERATION DISPLAY

Operation	LED Blinking Pattern
Normal operation	Continuously lighting
Protected operation	5sec ON / 1sec OFF
Pump down operation	1sec ON / 1sec OFF

02-03

2-2 TROUBLE SHOOTING WITH ERROR CODE

Trouble shooting 1			Indicate or Display:
INDOOR UNIT Error Method:			Indoor Unit	: No LED
Communication Error			Outdoor Unit	: No indication
(Indoor unit		Remote control)	ERROR CODE : E : 00
Detective Actuators:			Detective details:

Indoor unit controller PCB circuit Wired Remote Control

When the indoor unit cannot receive the signal from Wired Remote more than 10seconds after power ON, or the indoor unit cannot receive the signal more than 1minute during normal operation.

Forecast of Cause:

1. Terminal connection abnormal 2. Wired Remote Control failure 3. Controller PCB failure

Check Point 1 : Check the connection of terminal

After turning off the power, check & correct the followings.

Check the connection of terminal between remote control and Indoor unit, and check if there is a disconnection of the cable.

OK

Check Point 2 : Check Remote Control and Controller PCB

Check Voltage at CN17 of Controller PCB. (Power supply to Remote Control)
>> If it is DC12V, Remote Control is failure. (Controller PCB is normal)	>> Replace Remote Control
>> If it is DC 0V, Controller PCB is failure. (Check Remote Control once again)	>> Replace Controller PCB

Upon correcting the removed connector or mis-wiring, reset the power.

02-04

Trouble shooting 2

OUTDOOR UNIT Error Method:

Communication Error

(Serial Reverse Transfer Error)

Detective Actuators:

Outdoor Unit Main PCB Circuit

Active Filter Module

Forecast of Cause:

Indicateicate ororDisplay:Display:

Indoor Unit	: No LED
Outdoor Unit	: No indication

ERROR CODE : E : 01

Detective details:

When the indoor unit cannot receive the serial signal from Outdoor unit more than 10seconds.

1. Connection failure 2. External cause 3. Main PCB failure 4. Active Filter Module failure

Check Point 1-1 : Reset the power and operate

Does Error indication show again?

YES

Check Point 2 : Check Connection

Check any loose or removed connection line of Indoor unit and Outdoor unit.

>>If there is an abnormal condition, correct it by referring to Installation Manual or Data & Technical Manual.

Check connection between Outdoor Unit Main PCB and Filter PCB.

(If there is loose connector or open cable)

OK

NO

Check Point 1-2:

Check external cause such as noise

Check the complete insulation of the grounding.

Check if there is any equipment that causes harmonic wave near the power cable (Neon light bulb or any electronic equipment which causes harmonic wave).

Check Point 3 : Check the voltage of power supply

Check the voltage of power supply

>> Check if AC208 - 230V appears at Outdoor Unit Terminal L - N.

OK

Check Point 4 : Check Serial Signal (Reverse Transfer Signal)

Check Serial Signal (Reverse Transfer Signal)

>>Check if Indicated value swings between AC70V and AC130V at Outdoor Unit Terminal 1 - 3.

>>If it is abnormal, Check Active Filter Module. (PARTS INFORMATION 3)

>>If Active Filter Module is abnormal, replace it.

>>If Active Filter Module is normal, replace Main PCB.

WHITE	N
BLACK	L
RED	3
WHITE	2
BLACK	1

+

-

02-05

Trouble shooting 3 INDOOR UNIT Error Method:

Room Temperature Sensor Error

Detective Actuators:

Indoor Unit Controller PCB Circuit

Room Temperature Thermistor

Forecast of Cause :

Indicate or Display:

Indoor Unit	: No LED
Outdoor Unit	: No indication

ERROR CODE : E : 02 / 03

Detective details:

When Room Temperature Thermistor open or short-circuit is detected at power ON.

1. Connector connection failure 2.Thermistor failure 3. Controller PCB failure

Check Point 1 : Check connection of Connector

Check if connector is removed. Check erroneous connection. Check if thermistor cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

OK

Check Pointi 2 :: Remove connector and check Thermistor resistance value

Thermistor Characteristics (Approx. value)

Temperature		32°F	41°F	50°F	59°F	68°F	77°F	86°F	95°F
		(0°C)	(5°C)	(10°C)	(15°C)	(20°C)	(25°C)	(30°C)	(35°C)
Resistance Value (k	)	33.6	25.9	20.2	15.8	12.5	10.0	8.04	6.51
Temperature		104°F	113°F	122°F
		(40°C)	(45°C)	(50°C)
Resistance Value (k	)	5.30	4.35	3.59

If Thermistor is either open or shorted, replace it and reset the power.

OK

Check Pointi 3 :: Check voltage of Controller PCB (DC5.0V)

Make sure circuit diagram of indoor unit and check terminal voltage at Thermistor (DC5.0V)

GRAY GRAY		BLACK BLACK
1	2	1 2
1	2	1 2

CN7 CN8

THERMISTOR (PIPE TEMP.)

THERMISTOR (ROOM TEMP.)

If the voltage does not appear, replace Controller PCB.

02-06