Fujitsu ASU18RLQ Operating instructions

SPLIT TYPE
ROOM AIR CONDITIONER
WALL MOUNTED
type
Models Indoor unit Outdoor unit
ASU15RLQ
ASU18RLQ
AOU15RLQ
AOU18RLQ
INVERTER
SERVICE
INSTRUCTION
R410A

CONTENTS
1. SPECIFICATION
ASU15/18RLQ, AOU15/18RLQ.......................................................................................
2. DIMENSIONS
ASU15/18RLQ, AOU15/18RLQ......................................................................................
3. REFRIGERANT SYSTEM DIAGRAM
ASU15/18RLQ, AOU15/18RLQ......................................................................................
4. CIRCUIT DIAGRAM
ASU15/18RLQ, AOU15/18RLQ.......................................................................................
5. DESCRIPTION OF EACH CONTROL OPERATION
1. COOLING OPERATION..............................................................................................
3. DRY OPERATION......................................................................................................
2. HEATING OPERATION..............................................................................................
5. INDOOR FAN CONTROL...........................................................................................
4. AUTO CHANGEOVER OPERATION.........................................................................
7. LOUVER CONTROL...................................................................................................
6. OUTDOOR FAN CONTROL.......................................................................................
9. TIMER OPERATION CONTROL................................................................................
8. COMPRESSOR CONTROL........................................................................................
11. TEST OPERATION CONTROL..................................................................................
10. ELECTRONIC EXPANSION VALVE CONTROL........................................................
13. FOUR-WAY VALVE EXTENSION SELECT...............................................................
12. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )................................
15. MANUAL AUTO OPERATION ( Indoor unit body operation ).....................................
14. AUTO RESTART........................................................................................................
16. FORCED COOLING OPERATION............................................................................
18. COIL DRY OPEARTION CONTROL..........................................................................
17. COMPRESSOR PREHEATING..................................................................................
19. DEFROST OPERATION CONTROL..........................................................................
21. VARIOUS PROTECTIONS.........................................................................................
20. OFF DEFROST OPERATION CONTROL..................................................................
01-01
02-01
03-01
04-01
05-01
05-02
05-03
05-04
05-05
05-07
05-08
05-09
05-10
05-12
05-12
05-12
05-12
05-13
05-13
05-13
05-13
05-14
05-16
05-17
05-12

6. REFRIGERANT CAUTION -R410A-
1. R410A TOOLS............................................................................................................
3. PRECAUTION FOR SERVICING...............................................................................
2. PRECAUTION FOR INSTALLATION.........................................................................
5. DEFFERENCE FROM CONVENTIONAL MODEL(R22) AND PRECAUTIONS........
4. NEW REFRIGERANT R410A.....................................................................................
7. TROUBLE SHOOTING
1. WHEN THE UNIT DOES NOT OPERATE AT ALL....................................................
3. TROUBLE SHOOTING METHOD
2. SELF DIAGNOSIS FUNCTION..................................................................................
1. EXPLODED VIEW......................................................................................................
2. INVERTER ASSEMBLY SPECIFICATION.................................................................
8. APPENDING DATA
1. JUMPER SETTING OF INDOOR UNIT AND OUTDOOR UNIT................................
3. THERMISTOR RESISTANCE VALUES.....................................................................
4. CAPACITY/INPUT DATA...........................................................................................
2. OUTDOOR UNIT PRESSURE VALUE AND TOTAL ELECTRIC
CURRENT CURVE...................................................................................................
9. REPLACEMENT PARTS
10. INSTALLATION MANUAL
4. SELF-DIAGNOSIS FUNCTION AND CHECKING POINTS.......................................
5. SERIAL SIGNAL DIAGNOSIS....................................................................................
6. IPM PROTECTION.....................................................................................................
7. TROUBLE SHOOTING OF REFRIGERANT CYCLE.................................................
06-01
06-02
06-04
06-05
06-08
07-01
07-02
07-03
07-07
07-08
08-01
08-02
08-06
08-07
09-01
09-04
07-09

1 . SPECIFICATIONS
R410A
WALL MOUNTED type
INVERTER

SPECIFICATIONS
01-01
MODEL NAME
POWER SOURCE
PHASE
FREQUENCY
VOLTAGE
Ph
Hz
V
COOLING
PERFORMANCE
kW
Btu /h
CAPACITY (230V)
W
POWER CONSUMPTION (230V)
EER W/W
Btu /(h.W)
SEER
RUNNING CURRENT
POWER FACTOR
MAXIMUM CURRENT
MOISTURE REMOVAL
OPERATING NOISE
(SOUND PRESSURE)
Btu /(h.W)
A
%
A
L/hr
Pt /h
dB
dB
dB
dB
dB
INDOOR UNIT
OUTDOOR UNIT
HI
ME
LO
QUIET
kW
Btu /h
CAPACITY
W
POWER CONSUMPTION
COP W/W
Btu /(h.W)
Btu /(h.W)
HSPF
RUNNING CURRENT
POWER FACTOR
MAXIMUM CURRENT
A
%
A
OPERATING NOISE
(SOUND PRESSURE)
dB
dB
dB
dB
dB
INDOOR UNIT
OUTDOOR UNIT
HI
ME
LO
QUIET
COMPRESSOR TYPE
OUTPUT
AIR CIRCULATION
(FAN MODE)
INDOOR UNIT
OUTDOOR UNIT
-
W
m3 /h
cfm
m3 /h
cfm
STARTING CURRENT
MINIMUM CIRCUIT AMPACITY
MAXIMUM OVERCURRENT PROTECTION
DESIGN PRESSURE HIGH SIDE
LOW SIDE
PERMISSIBLE OUTDOOR
TEMPERATURE
COOLING
HEATING
A
A
A
PSI(MPa)
PSI(MPa)
°F
°C
°F
°C
HEATING
PERFORMANCE
OTHER
INDICATION
ASU15RLQ
AOU15RLQ
ASU18RLQ
AOU18RLQ
1
60
208-230
4.38
(1.62~4.98)
15,000
(5,500~17,000)
1,200
(250~1,900)
3.66
12.5
20.0
5.3
98
9.0
2.1
4.4
45
39
33
25
49
5.28
(1.32~7.32)
18,000
(4,600~25,000)
1,430
(250~2,850
3.69
12.6
10.0
6.3
98
13.5
42
38
33
27
49
5~75
-15~24
Rotary
1,100
700
412
2,000
1,176
6.3
16
20
450(3.10)
240(1.65)
14~115
-10~46
1
60
208-230
5.28
(1.62~5.58)
18,000
(5,500~19,000)
1,730
(250~2,000)
3.05
10.4
19.00
7.7
98
9.0
2.8
5.9
45
39
33
25
50
6.30
(1.32~8.52)
21,600
(4,600~29,000)
1,930
(250~2,930)
3.28
11.2
10.00
8.6
98
13.5
42
38
33
27
50
Rotary
1,100
700
412
2,000
1,176
8.6
16
20
450(3.10)
240(1.65)
14~115
-10~46
5~75
-15~24

SPECIFICATIONS
01-02
MODEL NAME
CONNECTING METHOD
PIPE SIZE
LIQUID SIDE
GAS SIDE
INSTALLATION
STANDARD PIPE LENGTH
MAXIMUM PIPE LENGTH
CHARGE LESS PIPE LENGTH
AMOUNT OF ADDITIONAL CHARGE
MAXIMUM HEIGHT DIFFERENCE
NUMBER OF WIRE
NET
DRAIN HOSE LENGTH
GROSS
(PACKAGING WEIGHT)
HEIGHT
HEIGHT
WIDTH
DEPTH
WIDTH
DEPTH
MAIN UNIT
DIMENSIONS
INDOOR UNIT
OUTDOOR UNIT
INDOOR UNIT
OUTDOOR UNIT
INDOOR UNIT
OUTDOOR UNIT
KIND OF REFRIGERANT
AMOUNT OF CHARGING
WEIGHT
OTHER
INDICATION
ASU15RLQ
AOU15RLQ
ASU18RLQ
AOU18RLQ
HEIGHT
HEIGHT
WIDTH
DEPTH
WIDTH
DEPTH
PACKAGE
DIMENSIONS
INDOOR UNIT
OUTDOOR UNIT
-
mm
in.
mm
m
m
m
ft.
g/m
oz. /ft.
m
ft.
-
mm
in.
kg
lbs.
kg
lbs.
kg
kg
mm
-
lbs.
kg
in.
ft.
ft.
lbs.
lbs.
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
Refrigerant
Flare
6.35
1/4
12.7
1/2"
7.5
25
20
66
15
49
20
3 /16
15
49
4
580
22-13/16"
10
22
40
88
12.5
28
44
97
283
11-1/8"
790
31-1/8"
230
9-1/16"
578
22-3/4"
790
31-1/8"
300
11-13/16"
316
12-7/16"
835
32-7/8"
360
14-3/16"
648
25-1/2"
910
35-13/16"
380
14-15/16"
R410A
1.15
2-9/16
Flare
6.35
1/4
12.7
1/2"
7.5
25
20
66
15
49
20
3 /16
15
49
4
580
22-13/16"
10
22
40
88
12.5
28
44
97
283
11-1/8"
790
31-1/8"
230
9-1/16"
578
22-3/4"
790
31-1/8"
300
11-13/16"
316
12-7/16"
835
32-7/8"
360
14-3/16"
648
25-1/2"
910
35-13/16"
380
14-15/16"
R410A
1.15
2-9/16

2 . DIMENSIONS
R410A
WALL MOUNTED type
INVERTER

DIMENSIONS
ASU18RLQ / AOU18RLQ
Models : ASU15RLQ / AOU15RLQ
02-01
INDOOR UNIT
OUTDOOR UNIT
unit : inch (mm)
31-1/8 (790) 9-1/16 (230)
11-1/8 (283)
13-11/16 (347)
22-3/4 (578)
1-7/8 (48)
3/8 (10)
12-5/8 (320)
20 (508)
21-1/4 (540)
13/16 (20)
11-13/16
(300)
4-15/16 (125)
2-5/8
(66)
31-1/8 (790)

3 . REFRIGERANT SYSTEM DIAGRAM
R410A
WALL MOUNTED type
INVERTER

REFRIGERANT SYSTEM DIAGRAM
2-Way
valve
Strainer
Strainer
Sub-heat
exchanger
( INDOOR )
3-Way
valve
Muffler
4-Way valve
Expansion valve
Heat exchanger
( INDOOR )
Heat exchanger
( OUTDOOR )
Sub-accumulator
Compressor
Cooling
Heating
ASU18RLQ/ AOU18RLQ
Models : ASU15RLQ / AOU15RLQ
03-01

4 . CIRCUIT DIAGRAM
R410A
WALL MOUNTED type
INVERTER

CIRCUIT DIAGRAM
ASU18RLQ AOU18RLQ
Models : ASU15RLQ / AOU15RLQ
04-01
OUTDOOR UNIT
INDOOR UNIT
BLACK
BLACK
BLACK
BLACK
ORANGE
YELLOW
RED
PINK
BLUE
RED
WHITE
YELLOW
WHITE
RED
BLUE BLUE
RED
YELLOW
WHITE
GREEN / YELLOW
GREEN
RED
BLACK
WHITE W1
W2
W3
W4
GRAY
GRAY
WHITE
BLACK
RED
YELLOW
BLUE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
RED
CN201
CN4
CN3
CN10CN2
CN1
CN6CN5
CN7
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
1
2
1
2
3
4
5
6
1
2
3
6
1
2
3
4
1
2
3
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
TERMINAL
ROOM TEMPERATURE THERMISTOR
PIPE TEMPERATURE THERMISTOR
FAN MOTOR
STEP MOTOR
SWITCH
BARISTOR
FUSE
3.15A
G123
F. M.
SW
POWER CIRCUIT
THERMAL FUSE
102
M
CONTROL BOARD
DISPLAY BOARD
AIR CLEAN UNIT

5 . DESCRIPTION OF EACH
CONTROL OPERATION
R410A
WALL MOUNTED type
INVERTER

( Fig. 1 : Limit of Maximum Frequency based on Outdoor Temperature )
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 Figure 1 based on the
fan speed mode and the outdoor temperature.
minimum
frequency
maximum
frequency
maximum
frequency
ASU15RLQ 18Hz 70Hz 90Hz
Outside air Outside air
temperature temperature
97°F(36°C)
A zone
93°F(34°C)
90°F(32°C)
B zone
86°F(30°C)
70°F(21°C)
C zone
66°F(19°C)
D zone
Hi Me Lo Quiet
( Table 1 : Compressor Frequency Range )
When the compressor operates for 30 minutes continuously at over the maximum frequency ,
the maximum frequency is changed from Maximum Frequency to Maximum Frequency .
The room temperature is controlled 2°F(1°C) lower than the setting temperature for 40 minutes
after starting the operation.
After 40 minutes, it is controlled based on the normal setting temperature.
05-01
E zone
F zone
50°F(10°C)
32°F(0°C)
54°F(12°C)
36°F(2°C)
ASU18RLQ 18Hz 70Hz 90Hz
15/18RLQ A zone
B zone
C zone
D zone
E zone
F zone
90Hz 45Hz 42Hz 30Hz
90Hz 45Hz 42Hz 30Hz
90Hz 45Hz 42Hz 30Hz
58Hz 38Hz 34Hz 24Hz
58Hz 38Hz 34Hz 24Hz
58Hz 38Hz 34Hz 24Hz

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.
minimum
frequency
maximum
frequency
ASU15RLQ
Outside air Outside air
temperature temperature
66°F(19°C)
C zone
63°F(17°C)
57°F(14°C)
B zone
54°F(12°C)
A zone
Hi Me Lo Quiet
* When the room temperature is between +4°F(+2°C) to -6°F(-3°C) 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
fan speed mode and the outdoor temperature.
( Table 2 : Compressor Frequency Range )
( Fig.2 : Limit of Maximum Frequency based on Outdoor Temperature )
* The room temperature is controlled 4°F(2°C) higher than the setting temperature for 60 minutes
after starting the operation.
After 60 minutes, it is controlled based on the normal setting temperature.
05-02
ASU18RLQ 18Hz 119Hz
18Hz 119Hz
A zone 119Hz 90Hz 70Hz 58Hz
B zone 119Hz 90Hz 70Hz 58Hz
15/18RLQ
C zone 119Hz 90Hz 70Hz 58Hz

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 Table 3. However, after the compressor is driven, the indoor unit shall
run at operation frequency of 58Hz, for a minute.
Operating
frequency
ASU15RLQ 24Hz
room room
temperature temperature
compressor ON
Ts+3°F(1.5°C)
Ts+1°F(0.5°C)
compressor OFF
Compressor
ON
OFF
Indoor fan
Dry air flow
S-Lo
OFF
( Table 3 : Compressor frequency )
( Fig.3 : Compressor Control based on Room Temperature )
( Fig.4 : Indoor Fan Control )
05-03
When an IAQ works, it operate with S-LO without stopping.
10 30 60 180 60 180 60 10 30 (SEC)
ASU18RLQ 24Hz

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.
.When operation starts, only the indoor and outdoor fans are operated for 1 minute. After 1 minute,
the room temperature and outside air temperature are sensed and the operation mode is
selected in accordance with the table below.
C zone
90°F(32°C)
B zone
-4°F(-20°C)
A zone
( Table.4 Operation mode selection table)
Outside air temperature (TO)
Room temperature (TB)
A zone B zone C zone
TB > TS+4°F(2°C) Monitoring Cooling
(automatic dry)
Cooling
(automatic dry)
TS+4°F(2°C) TB TS - 4°F(2°C) Monitoring Monitoring Monitoring
TB TS- 4°F(2°C) Heating Heating Monitoring
.When COOING was selected at , the air conditioner operates as follow:
The same operation as COOLING OPERATION of item 1 above is performed.
When the room temperature has remained at (set temperature -2°F(1°C)) for 8 minutes, operation is
automatically switched to DRY and the same operation as DRY OPERATION of item 3 above
is performed.
If the room temperature reaches (set temperature +4°F(2°C) during DRY operation, operation returns to
COOLING operation.
.When HEATING was selected at , the same operation as HEATING OPERATION of item 2
above is performed.
When the compressor was stopped for 6 consecutive minutes by the temperature control function
after the COOLING or HEATING operation mode was selected at above, operation is switched
to MONITORING and the operation mode is selected again.
1
<
1
2
31
4
1
( Fig.5 : Outside air temperature zone selection )
05-04

5. INDOOR FAN CONTROL
(1).Fan speed
( Table 5 : Indoor Fan Speed )
(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.
05-05
ASU15/18RLQ
Operation mode Air flow mode Speed (rpm)
Hi 1,560
Me+ 1,490
Me 1,370
Lo 1,170
Quiet 950
Cool air
prevention 850
Heating
S-Lo 480
Hi 1,560
Me 1,320
Lo 1,090
Cooling
Fan
Quiet 850
Dry 850

(3).COOLING OPERATION
Switch the airflow [AUTO], and the (Fig.6)
indoor fan motor will run according airflow change - over ( Cooling:AUTO )
to a room temperature, as shown in When the room
Figure 6. temperature rises
On the other hand, if switched in
[HIGH] [QUIET], the indoor motor +5°F(+2.5°C)
will run at a constant airflow of [COOL]
operation modes QUIET, LOW, MED,
HIGH, as shown in Table 5. +3°F(+1.5°C)
+2°F(+1°C)
LOW mode
When the room
temperature lowers
(Room temperature) D (Setting temperature)
(4).DRY OPERATION
(5).HEATING OPERATION
Switch the airflow [AUTO], and the (Fig.7)
indoor fan motor will run according airflow change - over ( Heating:AUTO)
to a room temperature, as shown in When the room
Figure 7. temperature rises
On the other hand, if switched LOW mode
[HIGH] [QUIET], the indoor motor -2°F(-1°C)
will run at a constant airflow of [HEAT] -3°F(-1.5°C)
operation modes QUIET, LOW, MED,
HIGH, as shown in Table 5. -4°F(-2°C)
-5°F(-2.5°C)
MED + mode
When the room
temperature lowers
(Room temperature) D (Setting temperature)
(6).COOL AIR PREVENTION CONTROL (Heating mode)
Indoor heat exchanger Indoor heat exchanger
temperature temperature
117°F(47°C) Hi
104°F(40°C) Me+
99°F(37°C)
Lo
Cool air prevention
86°F(30°C)
S-Lo
Refer to the table 4.
Durring the dry mode operation, the fan speed
setting can not be changed.
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.
(Fig.8 : Cool Air Prevention Control)
05-06
104°F(40°C)
82°F(28°C)
90°F(32°C)
93°F(34°C)
HIGH mode
MED mode
+4°F(+2°C)
MED mode

6. OUTDOOR FAN CONTROL
(1). Fan Speed
Cooling Dry Heating
( Table 6 : Outdoor fan speed )
*The outdoor fan speed mentioned avobe depends on the compressor frequency.
(When the compressor frequency increases, the outdoor fan speed also changes to the higher
speed. When the compressor frequescy decreases, the outdoor fan speed also changes to the
lower speed.)
*It runs at 500(A-D ZONE)/200(E,F ZONE) rpm for 20/60 seconds after starting up the outdoor fan.
*After the defrost control is operated on the heating mode, the fan speed keeps at the higher speed
as table 7 without relating to the compressor frequency.
05-07
ZONE
Refer to Fig1.
(rpm)
ASU15/18RLQ A-D
E
F
860/820/670/500
400~150
280~150
500
400~150
280~150
820/750/670/450
(2). Fan Speed
*Outdoor temperature falls, and if it becomes E and F zone(Refer to Fig1), rotations of fan speed
will fall.
( Table 7 : Outdoor fan speed after the defrost )
ASU15/18RLQ
Min
950rpm