Fujitsu AO G18LBCA Series Original operating manual

SPLIT TYPE
ROOM AIR CONDITIONER
Cassette type
Models Indoor unit Outdoor unit
AUXG18LRLB
AUXG24LRLB
RCG18LRLB
RCG24LRLB
AO*G18LBCA
AO*G24LBCA
INVERTER
SERVICE
INSTRUCTION
R410A
RCG18LRLB
RCG24LRLB

1-6 AIR FLOW DIRECTION CONTROL ......................................................................... 01-09
CONTENTS
1. SPECIFICATIONS
1. DESCRIPTION OF EACH CONTROL OPERATION
1-1 COOLING OPERATION............................................................................................
1-4 AUTO CHANGEOVER OPERATION........................................................................
1-5 INDOOR FAN CONTROL.........................................................................................
1-7 OUTDOOR FAN CONTROL......................................................................................
1-8 COMPRESSOR CONTROL......................................................................................
01-01
1-2 HEATING OPERATION............................................................................................. 01-02
1-3 DRY OPERATION...................................................................................................... 01-03
01-04
01-06
01-10
01-11
1-9 TIMER OPERATION CONTROL............................................................................... 01-12
1-10 ELECTRONIC EXPANSION VALVE CONTROL...................................................... 01-16
1-11 TEST OPERATION CONTROL............................................................................... 01-16
1-12 PREVENT TO START FOR 3 MINUTES (3 MINUTES ST).................................... 01-16
1-13 4-WAY VALVE EXTENSION SELECT.................................................................... 01-16
1-14 AUTO RESTART..................................................................................................... 01-17
1-15 PUMP DOWN.......................................................................................................... 01-17
1-16 COMPRESSOR PREHEATING............................................................................... 01-18
1-17 10°C HEAT OPERATION........................................................................................... 01-18
1-21 VARIOUS PROTECTIONS...................................................................................... 01-22
1-23 HUMAN SENSOR(OPTION) ................................................................................... 01-25
1-20 OFF DEFROST OPERATION CONTROL............................................................... 01-21
1-19 DEFROST OPERATION CONTROL....................................................................... 01-19
1-18 ECONOMY OPERATION........................................................................................ 01-18
1-22 DRAIN PUMP OPERATION ................................................................................... 01-24
2-1 ERROR DISPLAY......................................................................................................
2. TROUBLE SHOOTING
2-2 TROUBLE SHOOTING WITH ERROR CODE..........................................................
2-3 TROUBLE SHOOTING WITH NO ERROR CODE....................................................
2-4 SERVICE PARTS INFORMATION............................................................................
02-01
02-43
02-02
02-49

1 . DESCRIPTION OF EACH
CONTROL OPERATION
R410A
Cassette type
INVERTER

1-1. COOLING OPERATION
1-1-1 COOLING CAPACITY CONTROL
A sensor (room temperature thermistor) built in the indoor unit will usually perceive
difference or variation between a set temperature and present room temperature, and
controls the operation frequency of the compressor.
* If the room temperature is 6.0°C higher than a set temperature,
the compressor operation frequency will attain to maximum performance.
* If the room temperature is 1.0°C lower than a set temperature, the compressor
will be stopped.
* When the room temperature is between +6.0°C to -1.0°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 Fig.1 based on the
fan speed mode and the outdoor temperature.
minimum
frequency
maximum
frequency
10rps 120rps
Hi Me Lo Qu
97rps
97rps
72rps
53rps 37rps 34rps
53rps
53rps
46rps
46rps
49rps 40rps
22rps
34rps
34rps
34rps
A zone
B zone
C zone
D-F zone
Model 18
( Table 1 : Compressor Frequency Range )
( Fig. 1 : Limit of Maximum Frequency based on Outdoor Temperature )
01-01
107rps
107ps
80rps
62rps 47rps 40rps
62rps
62rps
51rps
51rps
56rps 47rps
25rps
40rps
40rps
40rps
A zone
B zone
C zone
D-F zone
Model 24
Fan speed mode
Outdoor air
temperature
A zone
B zone
C zone
D zone
E zone
F zone
When the room
temperature rises
When the room
temperature drops
36°C
32°C
21°C
12°C
2°C
34°C
30°C
19°C
10°C
0°C

01-02
1-2. HEATING OPERATION
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 6.0°C than a set temperature,
the compressor operation frequency will attain to maximum performance.
* If the room temperature is higher 1.0°C than a set temperature, the compressor
will be stopped.
* When the room temperature is between +1.0°C to -6.0°C of the setting temperature,
the compressor frequency is controlled within the range shown in Table2.
( Table 2 : Compressor Frequency Range )
minimum
frequency
maximum
frequency
12rps 120rps

1-3. DRY OPERATION
1-3-1 INDOOR UNIT CONTROL
The compressor rotation frequency shall change according to set temperature and room
temperature variation which the room temperature sensor of the indoor unit has detected
as shown in the Table 3.
( Table 3 : Compressor frequency )
( Fig.2 : Compressor Control based on Room Temperature )
01-03
Ts : Setting temperature
Ts+0.5°C
Ts+1.5°C
Operating frequency
34rps
X zone
J zone
0rpsY zone
Room Room
temperature temperature
X zone
J zone
Y zone
Ts-1.5°C
Ts-0.5°C
( Fig.3 : Indoor Fan Control )
10 30 60 360 120 360 120 10 30 (sec)
OFF
S-Lo
Lo
OFF
Setting air flow
Compressor
ON

1-4. AUTO CHANGEOVER OPERATION
01-04
When the air conditioner is set to the Auto mode by remote controller, operation starts in the optimum
mode from among the Heating, Cooling, and Monitoring mode. 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 0.5°C (wireless and 2WIRE remote controller)
Or 1.0°C (3WIRE remote controller) steps.
When operation starts, indoor fan and outdoor fan are operated for around 1 minutes.
Room temperature and outdoor temperature are sensed, and the operation mode is selected
in accordance with the table below. <Monitoring mode>
( Table 4 : Operation mode selection table )
Room temperature (TR)
TR> Ts+2°C
Ts+2°C TR Ts -2°C *Middle zone
TR < Ts -2°C Heating
When the compressor was stopped for 6 consecutive minutes by the temperature control function
after the Cooling or Heating mode was selected at above, operation is switched
to Monitoring and the operation mode is selected again.
When the middle zone is selected on the predetermining of the operation mode, the operation mode
before the changing to the monitor mode is selected.
1
2
3
1
( Fig.4 : Outdoor temperature zone selection )
Cooling
Operation mode
Temperature
25°C and over
25°C under Heating
Cooling
Mode
*If it's Middle zone, operation mode of indoor unit is selected as below.
(1). Same operation mode is selected as outdoor unit.
If outdoor unit is operating in Cooling and Heating mode,
indoor unit will be operated by the same operation mode.
(2). Selected by the outdoor temperature.
If outdoor unit is operating in other than Cooling and Heating mode, indoor unit will be operated
according to the outdoor temperature as below.
TR : Room temperature
Ts : Setting temperature

01-05
START
Room temp.
Ts+2°C?
COOLING OPERATIONHEATING OPERATION
YES
Auto change over is
second or more?
NO
NO
YES
NO
NO
AUTO CHANGEOVER operation flow chart
TS: Setting temperature
Room temp.
Ts -2°C?
Thermostat remains
in OFF state for 6 minutes or
longer?
System stops
or operation command other than
auto changeover operation?
NO
Thermostat remains
in OFF state for 6 minutes or
longer?
System stops
or operation command other than
auto changeover operation?
Middle zone
NO
NO
Operation mode of
outdoor unit : Cooling?
YES
NO
Operation mode of outdoor unit
: Heating?
YES
NO
YES
Outdoor temperature<
25°C?
NO
YES
YES
YES
NO
YES
YES
Operation mode
before the monitor mode is
cooling mode?
Monitor mode

1-5. INDOOR FAN CONTROL
1. Fan speed
( Table 5 : Standard of Indoor Fan Speed )
2. FAN OPERATION
*The following fan speed is a standard value.
The airflow can be switched in 5 steps such as AUTO, QUIET, LOW, MED, HIGH, while the indoor
fan only runs.
01-06
Operation
mode
Air flow
mode
HIGH
MED+
LOW
Heating
Quiet
Cooling
/ FAN
400
300
400
360
340
300
300
300
270
340
380
430
330
430
400
360
330
300
330
270
360
410
HIGH
MED
LOW
Quiet
Soft Quiet
S-Lo
FAN
Dry
3. COOLING OPERATION
Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature,
as shown in Fig.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 ) )
When the room
temperature rises
When the room
temperature drops
TR : Room temperature
Ts : Setting temperature
TR-Ts > 2°C
=
1°C > TR-Ts
2°C > TR-Ts > 1°C
=
TR-Ts > 2.5°C
=
1.5°C > TR-Ts
2.5°C > TR-Ts > 1.5°C
=
HIGH mode
MED mode
LOW mode
*1
*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.
Speed (rpm)
Model 18 Model 24
MED 360 400
Cool air prevention
300 300

4. HEATING OPERATION
Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature,
as shown in Fig.6.
On the other hand, if switched in [Hi ] ~ [Lo ], the indoor motor will run at a constant airflow
of [HEAT] operation modes Lo, Me, Hi, as shown in Table5.
6. DRY OPERATION
Refer to the table 5.
During the dry mode operation, the fan speed setting can not be changed.
01-07
Indoor heat exchanger
temperature
( Fig.6 : Airflow change - over ( Heating : AUTO ) )
TR-Ts > -1.0°C
=
-2.0°C > TR-Ts
1.0°C > TR-Ts > -2.0°C
=
TR-Ts > -1.5°C
=
-2.5°C > TR-Ts
-1.5°C > TR-Ts > -2.5°C
=
Lo mode
Me mode
Hi mode
5. COOL AIR PREVENTION CONTROL (Heating mode)
The maximum value of the indoor fan speed is set as shown in Fig.7, based on the detected
temperature by the indoor heat exchanger sensor on heating mode.
When the compressor does not operate, the indoor fan motor operates [S-Lo] or [Stop] mode.
( Fig.7 : Cool Air Prevention Control )
Cool air
prevention
S-Lo
42°C
30°C
34°C
Indoor heat exchanger
temperature rises Indoor heat exchanger
temperature drops
Hi
*Me+
or setting fan mode
*Lo
or setting fan mode
*Lo
or setting fan mode
*Lo
or setting fan mode
39°C
37°C
37°C
32°C
24°C
*Lower speed is selected.
42°C
30°C
34°C
Indoor heat exchanger
temperature rises Indoor heat exchanger
temperature drops
Hi
*Me+
or setting fan mode
*Lo
or setting fan mode
39°C
37°C
37°C
32°C
24°C
*Lower speed is selected.
13 min. later

01-08
Compressor
ON
OFF
Indoor fan
Setting air flow
OFF
10 30 60 180 60 180 60 10 30 (sec)
S-Lo
480rpm
( Fig 8 : Indoor Fan Control)
7. FAN CONTROL FOR ENERGY SAVING
When the air flow setting except AUTO mode, the indoor fan motor will run as shown in Fig.8.
( Factory setting)
Setting Description Function Number Setting Value
Disable
Enable
Remote controller
49
02
00
01
00 : When the outdoor unit is stopped, the indoor unit fan operates continuously following
the setting on the remote controller.
01 : When the outdoor unit is stopped, the indoor unit fan operates intermittently at a very
low speed.
02 : Enable or disable this function by remote controller setting.
Set to “00”or “01”when connecting a remote controller that cannot set
the Fan control for energy saving function or connecting a network converter.
To confirm if the remote controller has this setting,
refer to the operating manual of each remote controller.

To independently can be set the airflow pattern of each louver as this image.
Individual control
All louver control
This function is given priority to overall louver control.
But this function is release during the following operation.
Cold air prevention control
Monitor mode on the auto change over operation
Defrost operation
*When the 2 wire remote controller is disconnected, clear the individual setting.
Otherwise, this setting can’t change.
All louver operation
*Setting of the wireless remote controller is not displayed on the wired remote controller.
*The setting louver of the individual control function cannot be controlled.
Cooling mode standard position: 2
Dry mode standard position: 2
When the mode is selected, the standard
louver position of the each mode is set.
Monitor mode position: 2
Heating standard position : 4
The air direction range will change as follows:
Use the wired remote controller to set this function.
This function is only available by 2 wire remote controller.
(Fig.11 : Air Direction Range)
(Fig.10 : Independent louver control image)
01-09
1-6. AIR FLOW DIRECTION CONTROL

1-7. OUTDOOR FAN CONTROL
1. Outdoor Fan Motor
F
Zone control (rps:Compressor frequency)
1) Cool / Heat (Normal)
ollow
S-Hi2
S-Hi1
Hi3
Hi2
Hi1
Me2
Me1
Lo2
Lo1
ing table shows the fan speed of the outdoor unit.
01-10
( Table 6
-
1100 1100
1100
1050
1050
780
720
590
590
480
1100
530 430
370
300
-
1100
870
870
720
500
500
: Fan speed of the outdoor unit )
Cooling
Normal Normal
Heating
Ambient Temperature zone
2) Dry (Nomal)
F zone G zone
D zone(Normal 1)
D zone(Normal 2)
F zone
G zone
21°C
12°C
2°C
19°C
10°C
0°C
68rps
40rps
35rps
24rps
15rps
72rps
43rps
37rps
27rps
15rps
Hi2
Hi1
19rps and over [ Hi 1 ]
16rps and over [ Me 1 ]
16rps under [ Lo 1 ]
Me2
Me1
Lo2
Lo1
3) Cool / Dry / F zone
51rps and over [ Hi 1 ]
43rps and over [ Me 1 ]
43rps under [ Lo 1 ]
4) Cool / Dry / G zone
51rps and over [ Hi 1 ]
43rps and over [ Me 1 ]
43rps under [ Lo 1 ]
43rps and over [ Hi 1 ]
34rps and over [ Me 1 ]
34rps under [ Lo 1 ]
Low ambient cooling / Dry
Normal
Dry
-
-
-
-
-
530
530
-
-
-
-
-
-
-
-
-
-
-
-
-
-
350
300
260
-
-
250
250
200
-
-
H zone
H zone
-8°C
-10°C
5) Cool / Dry / H zone

1-8. COMPRESSOR CONTROL
1. OPERATION FREQUENCY RANGE
The operation frequency of the compressor is different based on the operation mode as
shown in Table 7.
Cooling / Dry Heating
Min Max Min Max
(Table 7 : Compressor Operation Frequency Range)
01-11
12rps10rps 120rps 120rps
2. OPERATION FREQUENCY CONTROL AT START UP
The compressor frequency soon after the start-up is controlled as shown in Fig.9.
(Fig.9 : Compressor Control at Start-up)
Normal start-up
35rps 53rps 66rps 82rps 106rps
(Frequency)
(Time)
Time 1 Time 2 Time 3 Time 4
Frequency
Frequency Frequency Frequency
Frequency
Frequency
Frequency
Time 5
Frequency
Frequency
Frequency
80sec 160sec 300sec 440sec 500sec
Time 1 Time 2 Time 3 Time 4 Time 5

1-9. TIMER OPERATION CONTROL
1. ON / OFF TIMER
OFF timer : When the clock reaches the set time, the air conditioner will be turned off.
Operation mode
Stop mode
Set time of timer
ON timer : When the clock reaches the set time, the air conditioner will be turned on.
Operation mode
Stop mode
Set time of timer
The weekly timer allows up to two ON and OFF time to set up per day.
Use this timer function to set operating time for each day of the week.
Operation mode
The operating time can be set in 30 min increments only.
The OFF time can be carried over to next day.
The ON timer and the OFF timer functions cannot be set with using the weekly timer.
Both ON and OFF time must be set.
2. WEEKLY TIMER
2-1. WEEKLY TIMER
Stop mode Stop mode Stop mode
Operation mode Operation mode
Set time Set time Set time Set time
01-12
UTY-RNR*Z1(2 wire remote controller)
1-9-1 Wired Remote Controller
ON / TIMER
*3 wire remote controller can be connected
If 3 wire remote controller is connected, set the DIP-SW on the controller PCB
Refer to the installation manual for detailed.
Sleep timer
Timer
10°C heat operation
If used in combination with wireless and wired remote controller, the following function is limited.
OFF / TIMER
WEEKLY TIMER

01-13
The DAY OFF setting is only available for days for which weekly settings already exist.
The DAY OFF setting can only be set one time. The DAY OFF setting is cancelled automatically
after the set day has passed.
Normal
Next day setting
If the operating time carries over to the next day (during a next day setting), the effective
DAY OFF range will be set as shown below.
2-2. DAY OFF setting
Stop mode Stop mode
Operation mode
Stop mode
Operation mode
Preceding day Next day
DAY OFF
Stop mode Stop mode
Operation mode
Stop mode
Operation mode
DAY OFF
Setting day
Preceding day Next daySetting day

01-14
AR-REJ1E
1. ON / OFF TIMER
OFF timer : When the clock reaches the set time, the air conditioner will be turned off.
Operation mode
Stop mode
Set time of timer
ON timer : When the clock reaches the set time, the air conditioner will be turned on.
Operation mode
Stop mode
Set time of timer
2. PROGRAM TIMER
ON / TIMER
OFF / TIMER
PROGRAM TIMER
SLEEP TIMER
The program timer allows the OFF timer and ON timer to be used in combination one time.
Operation mode
Operation will start from the timer setting (either OFF timer or ON timer)
whichever is closest to the clock's current timer setting.
The order of operations is indicated by the arrow in the remote control unit's display.
SLEEP timer operation cannot be combined with ON timer operation.
Stop mode Stop mode Stop mode
Operation mode Operation mode
Set time Set time Set time Set time
1-9-2 Wireless Remote Controller (OPTION)

01-15
3. SLEEP TIMER
If the sleep timer is set, the room temperature is monitored and the operation is stopped automatically.
If the operation mode or the set temperature is change after the sleep timer is set, the operation is
continued according to the changed setting of the sleep timer from that time ON.
Set temperature rises
( Ts : Set temperature )
Stop of operation
Set temperature lowers
( Ts : Set temperature )
Ts
Stop of operation
In the COOLING operation mode
When the sleep timer is set, the setting temperature is increased 1 degC.
It increases the setting temperature another 1 degC after 1 hour.
After that, the setting temperature is not changed and the operation is stopped at the time
of timer setting.
Ts
+1°C
+2°C
-2°C
-1°C
-4°C
-3°C
Set 60min
In the HEATING operation mode
When the sleep timer is set, the setting temperature is decreased 1 degC.
It decreases the setting temperature another 1 degC every 30 minutes.
Upon lowering 4 degC, the setting temperature is not changed and the operation stops
at the time of timer setting.
Set 30min 60min 90min

1-10. 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 52 ~ 480 pulses (Cooling) and 52 ~ 480
pulses (Heating).
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).
1-11. TEST OPERATION CONTROL
The compressor won't enter operation status for 3 minutes after the compressor is stopped,
even if any operation is given.
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.
1-12. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )
1-13. 4-WAY VALVE EXTENSION SELECT
01-16
Touch the [Test run] in the “Maintenance” screen.
The “Test Run” screen is displayed.
Touch [OK] to return to the Maintenance screen, and start the test run.
The test run will automatically end is approximately 60 min.
If you wish to cancel the test run before it is complete, return to the “Monitor Mode screen”, and touch
the On/Off button.
(Installer password* is required.)
*If the password has been changed from the default setting “0000”,
please contact the installer.
With Wired Remote Controller
Under the condition where the air conditioner runs, press the TEST RUN button, and
the test operation control mode will appear.
During test running, the Operation LED and Timer LED of the air conditioner body blinks 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.
With Wireless Remote Controller

1-15. PUMP DOWN
01-17
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
Energy saving setting
Set temperature
Set air flow
Timer mode and timer time (Set by wireless remote controller)
10°C HEAT (Wireless remote controller is in use)
Each central setting
ECONOMY
1-14. AUTO RESTART