Fujitsu AU G18LVLB Series Original operating manual

SPLIT TYPE
ROOM AIR CONDITIONER
Models
AO* G18LBCB
SERVICE
INSTRUCTION
R410A
AU* G18LVLB
AR* G18LLTB
AB* G18LVTB
Floor Ceiling type
Slim Duct
type
Cassette type
AR* G18LSLAP
Duct type
Indoor unit Outdoor unit
INVERTER

CONTENTS
1. DESCRIPTION OF EACH CONTROL OPERATION
1-1.COOLING OPERATION.............................................................................................
1-3. DRY OPERATION......................................................................................................
1-2. HEATING OPERATION..............................................................................................
1-5. INDOOR FAN CONTROL...........................................................................................
1-4. AUTO CHANGEOVER OPERATION.........................................................................
1-7. LOUVER CONTROL...................................................................................................
1-6. OUTDOOR FAN CONTROL.......................................................................................
1-9. TIMER OPERATION CONTROL................................................................................
1-8. COMPRESSOR CONTROL........................................................................................
1-11. TEST OPERATION CONTROL..................................................................................
1-10. ELECTRONIC EXPANSION VALVE CONTROL.......................................................
1-13. 4-WAY VALVE EXTENSION SELECT.......................................................................
1-12. PREVENT TO RESTART FOR 3 MINUTES (3 MINUTES ST)..................................
1-18. ECONOMY OPERATION...........................................................................................
1-14. AUTO RESTART........................................................................................................
1-21. DRAIN PUMP OPERATION.......................................................................................
1-19. FRESH AIR CONTROL..............................................................................................
1-22. DEFROST OPERATION CONTROL..........................................................................
01-01
01-02
01-02
01-03
01-05
01-09
01-10
01-13
01-14
01-18
01-18
01-18
01-19
01-20
01-20
01-21
1-20. EXTERNAL ELECTRICAL HEATER CONTROL........................................................ 01-20
01-22
1-23. OFF DEFROST OPERATION CONTROL.................................................................. 01-24
1-24. VARIOUS PROTECTIONS......................................................................................... 01-25
1-25. FORCED COOLING OPERATION............................................................................. 01-26
1-26. COMPRESSOR STOP CONTROL............................................................................. 01-26
01-18
1-15. MANUAL AUTO OPERATION.................................................................................... 01-19
1-16. COMPRESSOR PREHEATING..................................................................................01-19
1-17. 10°C HEAT OPERATION........................................................................................... 01-20
2-1-2 WIREDREMOTE CONTROLLER DISPLAY......................................................
2-1-1 INDOOR UNIT & WIRED REMOTE CONTROLLER DISPLAY..........................
2-1 ERROR DISPLAY ......................................................................................................
2. TROUBLE SHOOTING
2-2 TROUBLE SHOOTING WITH ERROR CODE ..........................................................
2-3 TROUBLE SHOOTING WITH NO ERROR CODE ....................................................
2-4 TROUBLE SHOOTING WITH ERROR CODE(For WIRELESS LAN ADAPTER).....
02-01
02-01
02-02
2-1-3 WIRELESS LAN INDICATOR DISPLAY.............................................................02-03
2-1-4 MOBILE APP DISPLAY(For AIR CONDITIONER)..............................................02-04
2-1-5 MOBILE APP DISPLAY(In WIRELESS LAN CONTROL SYSTEM)....................02-05
02-37
02-11
02-42
2-5 SERVICE PARTS INFORMATION ............................................................................ 02-50

R410A
F L O O R C E IL IN G / SLIM DUCT
MINI DUCT / CASSETTE type
IN V E R T E R
1 . DESCRIPTION OF EACH
CONTROL OPERATION

1-1. C OOLING OPE RA TION
1-1-1 C OOL ING C A PAC ITY C ONTROL
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.
The maximum frequency is limited in the range shown in Figure 1 based on the fan speed mode
and the outdoor temperature.
* If the room temperature is 2 degC higher than a set temperature,
the compressor operation frequency will attain to maximum frequency.
* If the room temperature is 2.5 degC lower than a set temperature, the compressor will be stopped.
* When the room temperature is between +2 degC to -2.5 degC of the setting temperature,
the compressor frequency is controlled within the range shown in Table1.
minimum
frequency
maximum
frequency
18rps 103rps
Outdoor air
temperature A zone
B zone
C zone
D zone
E zone
F zone
Hi Me Lo Quiet
A zone 103rps
49~56rps
74rps
38rps
49rps
29rps
25rps
18rps
B zone
C zone
D-F zone
( Table 1 : Compressor Frequency Range )
( Fig. 1 : Limit of Maximum Frequency based on Outdoor Temperature )
01-01
Fan speed
mode
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
103rps 74rps 49rps 25rps
80rps 49rps 38rps 25rps

1-2. HE A TING OPE RA TION
1-2-1 HE A TING C A PAC ITY C ONTROL
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 3 degC than a set temperature,
the compressor operation frequency will attain to maximum frequency.
* If the room temperature is higher 2.5 degC than a set temperature, the compressor
will be stopped.
* When the room temperature is between +2.5 degC to -3 degC of the setting temperature,
the compressor frequency is controlled within the range shown in Table2.
( Table 2 : Compressor Frequency Range )
01-02
minimum
frequency
maximum
frequency
8rps 120rps
Operating
frequency
25 rps
1-3. DRY OPE RATION
1-3-1 INDOOR UNIT C ONTROL
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 Fig 2.
Room
temperature Room temperature
Compressor ON
Ts-0.5 degC
Ts-1.5 degC
Compressor OFF
( Table 3 : Compressor frequency )
( Fig.2 : Compressor Control based on Room Temperature )
Ts : Setting temperature

1-4. A UTO C HA NG E OVE R OPE RA TION
01-03
When the air conditioner is set to the Auto mode by remote controller, operation starts in the optimum
mode from among the Heating, Cooling, Dry 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 1°C steps.
When operation starts, indoor fan and outdoor fan are operated for
around 2 minutes (AB type, AR type), or 3 minutes (AU type).
Room temperature and outdoor temperature are sensed,
and the operation mode is selected in accordance with the table below.
<Monitoring mode>
Cooling mode
25°C
Heating 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 Cooling or Dry mode was selected at and air flow mode is Auto, the air conditioner operates as follow.
The same operation as COOLING OPERATION AND DRY OPERATION.
When the room temperature has remained at set temperature -1.5°C,
operation is automatically switched to Dry mode.
If the room temperature reaches set temperature +2°C during Dry mode, operation returns to Cooling.
1
1
2
( Fig. 3 : Outdoor temperature zone selection )
Cooling
(Autmatic dry)
Operation 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, Dry, 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, Dry, and Heating mode,
indoor unit will be operated according to the outdoor temperature as below.
Cooling
Cooling
Dry
Dry
Compressor stop
When the room
temperature drops
When the room
temperature rises
Ts + 2°C
Ts - 0.5°C
Ts - 1.5°C
Ts + 1°C
Ts - 1.5°C
Ts - 2.5°C
( Fig.4 : Auto changeover : Cooling - Dry )
TR : Room temperature
Ts : Setting temperature
TR : Room temperature
Ts : Setting temperature
( Air flow mode : Auto )
When Heating was selected at , the same operation as HEATING OPERATION of page
01-02 is performed.
When the compressor was stopped for 6 consecutive minutes by the temperature control function
after the Cooling(Auto:Dry) or Heating mode was selected at above, operation is switched
to Monitoring and the operation mode is selected again.
3
1
4
1

01-04
START
Room temp.
Ts + 2
°C ?
COOLING (AUTO:DRY)
OPERATION
HEATING OPERATION
YES
YES
NO
NO
NO
AUTO CHANGEOVER operation flow chart
T S : 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
Operation mode
of outdoor unit : Cooling or Dry?
YES
NO
Operation mode
of outdoor unit : Heating?
YES
NO
YES
Outdoor temperature
25°C?
NO
YES
YES
NO
YESYES

1-5. INDOOR FAN CONTROL
1. Fan speed
( Table 5 : Indoor Fan Speed )
01-05
Operation mode Air flow mode Speed (rpm)
1040
1000
950
800
740
500
300
1040
950
800
740
500
740
300
Dry
Monitoring
Cooling
Fan
Heating
AB*G18LVTB
*Note, during Economy operation and operation
mode is Fan, air flow is 1 step downs.
(Hi > Me, Me > Lo, Lo > Quiet, Quiet > Soft Quiet)
Hi
Me+
Me
Lo
Quiet
Cool air prevention
S-Lo
Hi
Me
Lo
Quiet
*Soft Quiet
Auto
S-Lo
Operation mode Air flow mode Speed (rpm)
1380
1300
1220
1140
600
1380
1300
1220
1140
600
1140
600
Dry
Monitoring
Cooling
Fan
Heating
AR*G18LLLA
Hi
Me
Lo
Quiet
S-Lo
Hi
Me
Lo
Quiet
*Soft Quiet
Auto
S-Lo
*Note, during Economy operation and operation
mode is Fan, air flow is 1 step downs.
(Hi > Me, Me > Lo, Lo > Quiet, Quiet > S-Lo)
Operation mode Air flow mode Speed (rpm)
1290
1060
800
730
530
Dry
Monitoring
Cooling
Fan
Heating
AR*G18LSLAP
Hi
Me
Lo
Quiet
S-Lo
Hi
Me
Lo
Quiet
Auto
S-Lo
S-Lo
1290
1060
800
730
530
730
530
2. FA N OPE RA TIO N
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.
*Note, during Economy operation and operation
mode is Fan, air flow is 1 step downs
(Hi > Me, Me > Lo, Lo > Quiet, Quiet > Soft Quiet)
Operation mode Air flow mode Speed (rpm)
830
770
730
630
500
400
300
730
630
540
460
400
460
300
Dry
Monitoring
Cooling
Fan
Heating
AU*G18LVLB
Hi
Me+
Me
Lo
Quiet
Cool air prevention
S-Lo
Hi
Me
Lo
Quiet
*Soft Quiet
Auto
S-Lo
*Note, during Economy operation and operation
mode is Fan, air flow is 1 step downs
(Hi > Me, Me > Lo, Lo > Quiet, Quiet > Soft Quiet)

6. HEATING OPERATION (Auto : Heating)
01-06
3. COOLING OPERATION (Auto : Cooling)
( 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 > - 1.5 degC
=
- 2.5 degC > TR-Ts
- 1.5 degC > TR-Ts > - 2.5 degC
=
TR-Ts > 2 degC
=
1 degC > TR-Ts
2 degC > TR-Ts > 1 degC
=
TR-Ts > 2.5 degC
=
1.5 degC > TR-Ts
2.5 degC > TR-Ts > 1.5 degC
=
TR-Ts > - 1 degC
=
- 2 degC > TR-Ts
- 1 degC > TR-Ts > - 2 degC
=
High mode
Med mode
Low mode
( Fig.7 : Airflow change - over ( Heating : AUTO ) )
When the room
temperature rises
When the room
temperature drops TR : Room temperature
Ts : Setting temperature
Low mode
Med mode
High mode
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] [QUIET], the indoor motor will run at a constant airflow of [COOL]
operation modes QUIET, LOW, MED, HIGH, as shown in Table 5.
Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature,
as shown in Figure 7.
On the other hand, if switched [HIGH] [QUIET], the indoor motor will run at a constant airflow of [HEAT]
operation modes QUIET, LOW, MED, HIGH, as shown in Table 5.
4. DRY OPERATION (Auto : Dry)
Refer to Table 6. During the dry mode operation, the fan speed setting can not be changed.
Compressor
ON
OFF
Indoor fan
Dry air flow
S-Lo
OFF
( Fig.6 : Indoor Fan Control )
10 30 60 180 60 180 60 10 30 (SEC)
5. INDOOR UNIT FAN CONTROL FOR ENERGY SAVING (Cooling mode)
Switch the airflow at cooling mode, and the indoor fan motor will run as shown in Fig.6.
It depends on the Function setting "Indoor unit fan control for energy saving."

7. COOL AIR PREVENTION CONTROL (Heating mode)
01-07
The maximum value of the indoor fan speed is set as shown in Figure 8, 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] mode.
( Fig.8 : Cool Air Prevention Control )
*Hi
or setting fan mode
*Lo
or setting fan mode
37°C
29°C
32°C
24°C
Indoor heat exchanger
temperature rises Indoor heat exchanger
temperature drops
During Normal Heating operation During 10°C Heat operation
7-2. F or A R *G18L L L A / A R*G 18LS LA P
39°C
Indoor heat exchanger
temperature rises Indoor heat exchanger
temperature drops
Lo 34°C
Auto
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
Cool air
prevention
39°C
37°C
37°C
32°C
24°C
S-Lo
S-Lo
37°C
Indoor heat exchanger
temperature rises Indoor heat exchanger
temperature drops
Lo 32°C
Auto
39°C
Indoor heat exchanger
temperature rises Indoor heat exchanger
temperature drops
Lo 34°C
Auto
During Normal Heating operation During 10°C Heat operation
7-1. F or A B *G 18L VTB
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
Cool air
prevention
39°C
37°C
37°C
32°C
24°C
S-Lo
During Normal Heating operation During 10°C Heat operation
7-3. F or A U*G 18L VL B
*Lower speed is selected.
*Lower speed is selected.
*Lower speed is selected.