Fujitsu AUU18RC User manual

SPLIT TYPE
AIR CONDITIONER
CASSETTE type
CONTENTS
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
OUTLINE AND DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
REFRIGERANT SYSTEM DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . 3
CIRCUIT DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INDOOR PRINTED CIRCUIT BOARD CIRCUIT DIAGRAM . . . . . 5
OUTDOOR PRINTED CIRCUIT BOARD CIRCUIT DIAGRAM . . . 6
INDOOR P.C. BOARD LAYOUTS . . . . . . . . . . . . . . . . . . . . . . . . . . 7
OUTDOOR P.C. BOARD LAYOUTS . . . . . . . . . . . . . . . . . . . . . . . . 8
DISASSEMBLY ILLUSTRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Models Indoor unit Outdoor unit
AUU18RC AOU18RC
AUU24RC AOU24RC

– 2 –– 1 –
SPECIFICATIONS
TYPE COOL & HEAT
INDOOR UNIT AUU18RC AUU24RC
OUTDOOR UNIT AOU18RC AOU24RC
COOLING CAPACITY (BTU/hr) 18,000 - 17,000 23,500 - 22,500
HEATING CAPACITY 18,500 - 18,000 24,000 - 23,000
POWER SOURCE (V) 230 / 208
FREQUENCY (Hz) 60
RUNNING CURRENT (A) COOLING 8.5 - 9.0 10.7 - 11.4
HEATING 7.7 - 8.1 9.5 - 10.2
INPUT WATTS (kW) COOLING 1.90 - 1.83 2.35 - 2.30
HEATING 1.72 - 1.66 2.10 - 2.05
EER (BTU/h•W) COOLING 9.5 - 9.3 10.5 - 11.2
HEATING 10.8 - 10.8 9.5 - 10.2
MOISTURE REMOVAL (/hr) 1.8 2.7
AIR CIRCULATION-Hi (m3/hr) 920 1,100
ELECTRICAL DATA
COMPRESSOR
FAN MOTOR
DIMENSIONS
TYPE Hermetic type, Permanent split condenser, 2 pole, Single phase, Induction motor
CODE H25B18QABCA H25B24QABCA
REFRIGERANT R-22 lbs (g) 4.85 (2,200) 5.07 (2,300)
POWER SOURCE (V) 230 / 208
TYPE MFA-25GPM
INDOOR UNIT HI-SPEED ( r.p.m. ) 420 490
MED-SPEED ( r.p.m. ) 370 430
LO-SPEED ( r.p.m. ) 330 360
OUTDOOR UNIT TYPE MFB-24GPT
( r.p.m. ) ,735
INDOOR UNIT
H x W x D inch (mm)
9-11/16" (246) x 32-11/16" (830) x 32-11/16" (830)
OUTDOOR UNIT 25-1/8" (643) x 33-1/32" (840) x 13-1/4" (336)
WEIGHT
INDOOR UNIT
GROSS / NET lbs (kg)
97 / 75 (44 / 34) 97 / 75 (44 / 34)
OUTDOOR UNIT 165 / 147 (75 / 67) 167 / 150 (76 / 68)
Note : In the case that 7.5 m are exceeded, when using a connection pipe other than that in the table,
charge additional refrigerant with 40 g (1.41 oz) / 3.3 ft (1 m) as the criteria.
REFRIGERANT CHARGE
PIPE LENGTH 25 ft ( 7.5 m ) 33 ft ( 10 m ) 49 ft ( 15 m ) 66 ft ( 20 m ) 83 ft ( 25 m )
FULL CHARGE AUU18RC 2,200 g ( 77.6 oz ) 2,300 g ( 81.1 oz ) 2,500 g ( 88.2 oz ) 2,700 g ( 95.2 oz ) 2,900 g ( 102.3 oz )
AMOUNT AUU24RC 2,300 g ( 81.1 oz ) 2,400 g ( 84.7 oz ) 2,600 g ( 91.7 oz ) 2,800 g ( 98.8 oz ) 3,000 g ( 105.8 oz )

305.5 298.5 248.5
200 60
(Drain pipe) 100 (Small pipe) 70 (Large pipe)
33-1/32"(840) 13-1/4"(336)
31-21/32"(804)
25-1/8"(643)
13-7/64"(333)
9-11/16"
(246)
9-1/4"
(235)
9-25/32"
(248.5)
11-3/4"
(298.5)
12
(305.5)
1"(25)
1-3/16"
(30)
37 (940)
37 (940)
2-3/8"(60) (Drain pipe)
Drain inside Dia. ø1-17/64"(ø32)
outside Dia. ø1-29/64"(ø37)
3-15/16"(100) (Small pipe) 2-3/4"(70) (Large pipe)
32-11/16"(830)
32-11/16"(830)
– 2 –
Models : AUU18RC
AUU24RC
Models : AOU18RC
AOU24RC
OUTLINE AND DIMENSIONS
INDOOR UNIT
Unit : inch (mm)
OUTDOOR UNIT

– 3 –
REFRIGERANT SYSTEM DIAGRAM
Models : AUU18RC / AOU18RC
Models : AUU24RC / AOU24RC
Indoor Unit
Refrigerant pipe
ø 3/8”(9.53mm)
Refrigerant pipe
ø 5/8 (15.88mm)
Capillary
tube
Outdoor Unit
Condenser
Muffler
Muffler
Compressor
Strainer
Dryer
4-Way
valve
Cooling
: Flare coupling
Charging valve
Evaporator
Distributor
Indoor Unit
Refrigerant pipe
ø 3/8 (9.53mm)
Refrigerant pipe
ø 5/8 (15.88mm)
Capillary
tube
Outdoor Unit
Condenser
Muffler
Muffler
Compressor
Strainer
Dryer
4-Way
valve
Cooling
Heating
: Flare coupling
Charging valve
Evaporator
Distributor

– 4 –
CIRCUIT DIAGRAM
Models : AUU18RC / AOU18RC
AUU24RC / AOU24RC
CN 10 CN 4
STEP
MOTOR
FLOAT
SWITCH
DRAIN PUMP
MOTOR
FAN MOTOR
CAPACITOR
CONTROL BOARD
THERMISTOR
(PIPE TEMP.)
123
THERMISTOR
(ROOM TEMP.)
TO REMOTE
CONTROL UNIT
TERMINAL
FILTER BOARD
Use T 3.15A–250V Fuse on F101
BROWN
RED
1
2
1
2
WHITE
WHITE
CN 15
BLACK
BLACK
BLACK
BLACK
CN 7
GRAY GRAY
CN 17
WHITE
BLACK
RED
RED
GREEN
BLACK WHITE RED
ORANGE
YELLOW
WHITE
BROWN
RED
ORANGE
YELLOW
WHITE
M
CN 8
BLACK BLACK
CN 1
WHITE
BLACK
3
L
N
12
(N)
TO OUTDOOR UNIT
TERMINAL
CN 6
BLACK
BLACK
YELLOW
YELLOW
FAN
MOTOR
CN 5
BLACK
WHITE
RED
1 2
1 2
2
1
2
33
1
2
1
2
33
1
1 2
1 2
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
1
2
3 3
1
2
1
2
3 3
1 1
2 2
1 1
2 2 M
1 1
2 2
2 2
1 1
3 3 3 3
FM
TRANSFORMER
SOLENOID
COIL
FAN MOTOR CAPACITOR
COMPRESSOR
CAPACITOR
COMPRESSOR
C
S
R
POWER
RELAY
TERMINAL
THERMISTOR
TEST
(PIPE TEMP.)
THERMISTOR
(OUTDOOR TEMP.) (DISCHARGE TEMP.)
THERMISTOR
GREEN
PURPLE PURPLE WHITE WHITE WHITE BLACK
BLACK
BLACK
BLACK
BLACK BLACK
BLACK
BLACK
GRAY
GRAY
BROWN
BROWN
RED
RED
RED RED WHITE BLACK BLUE RED RED RED
WHITE WHITE
WHITE
CN15 CN9 CN1 CN4 CN3 CN2 CN5
CN11CN10 ECN12 CN13
PRINTED CIRCUIT BOARD
1 2 1 2 1 2
1 2 4 3 2 1 1 21 21 2
1 21 2 3
1 2 3
FAN
MOTOR
SV
L
GN 3
2
(N)
1
TO INDOOR UNIT
TO POWER SUPPLY
NO
COM
OVERLOAD
PROTECTOR
INDOOR UNIT
OUTDOOR UNIT

– 5 –
INDOOR PRINTED CIRCUIT BOARD
CIRCUIT DIAGRAM
PIPE TEMPERATURE
THERMISTOR
ROOM TEMPERATURE
THERMISTOR
Models : AUU18RC
AUU24RC
AUTO RESTART SWITCHING
CUSTOM CODE SWITCHING
CUSTOM CODE SWITCHING
ZONE CONTROL SWITCHING
ROOM TEMPERATURE CORRECTION
(HEATING OPERATION)
ROOM TEMPERATURE CORRECTION
(HEATING OPERATION)
FILTER PCB
FLOAT SWITCH
FAN
SWITCHING
CONTROLLER PCB ASSEMBLY
AUU18RC : EZ–0016HSE–C
AUU24RC : EZ–0015HSE–C

– 6 –
OUTDOOR PRINTED CIRCUIT BOARD
CIRCUIT DIAGRAM
Models : AOU18RC
AOU24RC
POWER
SOURCE
208V/230V
60 Hz
COMPRESSOR CAPACITOR
PIPE TEMPERATURE THERMISTOR
OUTDOOR TEMPERATURE THERMISTOR
DISCHARGE THERMISTOR
CONTROLLER PCB ASSEMBLY
EZ–0010HUE–C
MODEL No. CAPACITANCE
AOU18RC 30µF 400VAC
AOU24RC 35µF 400VAC

– 7 –
INDOOR P.C. BOARD LAYOUTS
CONTROLLER PCB ASSEMBLY (MAIN PCB)
(Viewed from the solder side)
FILTER PCB ASSEMBLY
(Viewed from the solder side)

– 8 –
OUTDOOR P.C. BOARD LAYOUTS
CONTROLLER PCB ASSEMBLY (MAIN PCB)
(Viewed from the component side)
(Viewed from the solder side)

692
544
710
469 468
245
858
487
71
71
858
61
240
93
545
544 705
847
542
705
847
692
690
692
847
543 543
544
544
122
543
122
847
692
690
692
847
543
847
122 690
847
692
226
338
522
122 122
834-2
876-2
472-4 472-2
472-3
777-2
777-1
472-1
472-5
472-5
472-5
472-5
– 9 –
DISASSEMBLY ILLUSTRATION
Models : AUU18RC
AUU24RC