Fujitsu ASUH24LPAS User manual

AIR CONDITIONER
Wall mounted type
SERVICE MANUAL
INDOOR
ASUH18LPAS
ASUH24LPAS
OUTDOOR
AOUH18LPAS1
AOUH24LPAS1
SR_AS051EF_03
2022.10.12

Notices:
• Product specifications and design are subject to change without notice for future improvement.
• For further details, please check with our authorized dealer.
Trademarks
FGLair™ is trademark of Fujitsu General Limited in the United States, other countries or both.
Google Play™ is trademark of Google LLC.
App Store® is a service mark of Apple Inc., registered in the U.S. and other countries.
Copyright © 2021, 2022 Fujitsu General Limited. All rights reserved.

CONTENTS
1. GENERAL INFORMATION
2. TECHNICAL DATA AND PARTS LIST
3. TROUBLESHOOTING
4. CONTROL AND FUNCTIONS
5. FILED WORKING

1. GENERAL INFORMATION
2022.10.12
SR_CH01_AS051EF_02

CONTENTS
1. GENERAL INFORMATION
1. Specifications..............................................................................................01-1
1-1. Indoor unit ......................................................................................................................01-1
1-2. Outdoor unit....................................................................................................................01-3
2. Dimensions..................................................................................................01-4
2-1. Indoor unit ......................................................................................................................01-4
2-2. Outdoor unit....................................................................................................................01-6

1. Specifications
1-1. Indoor unit
Type Wall mounted
Inverter heat pump
Model name ASUH18LPAS ASUH24LPAS
Power supply 208/230 V ~60 Hz
Power supply intake Outdoor unit
Available voltage range 187—253 V
Capacity
Cooling
Rated kW 5.28 7.03
Btu/h 18,000 24,000
Min.—Max. kW 1.17—5.57 1.17—7.15
Btu/h 4,000—19,000 4,000—24,400
Heating
Rated kW 5.28 7.03
Btu/h 18,000 24,000
Min.—Max. kW 0.82—7.03 0.85—8.50
Btu/h 2,800—24,000 2,900—29,000
Heating (17°F)*1
Rated kW 3.28 4.51
Btu/h 11,200 15,400
Max. kW 4.40 5.57
Btu/h 15,000 19,000
Heating (5°F)*2
Rated kW 5.3 5.71
Btu/h 18,100 19,500
Max. kW 5.55 5.71
Btu/h 18,600 19,500
Input power
Cooling Rated
kW
1.50 2.60
Min.—Max. 0.15—1.90 0.15—3.20
Heating Rated 1.33 2.07
Min.—Max. 0.15—2.10 0.15—3.10
Heating (17°F)*1Rated 1.12 1.58
Max. 1.70 2.20
Heating (5°F)*2Rated 2.47 2.85
Max. 2.50 2.85
Current Cooling Rated A 6.7 11.4
Heating 5.9 9.1
EER2 Cooling kW/kW 3.52 2.7
Btu/hW 12.0 9.2
COP2 Heating kW/kW 3.96 3.4
Btu/hW 13.5 11.6
SEER2 Cooling Btu/hW 20.0 19.0
HSPF2 Heating Btu/hW 10.5 9.8
Power factor Cooling %97.3 99.2
Heating 98.0 98.9
Moisture removal pints/h (L/h) 4.0 (1.9) 6.3 (3.0)
Maximum operating current*3Cooling A9.9 14.4
Heating 11.9 13.9
Fan
Airflow rate
Cooling
HIGH
CFM (m3/h)
530 (900) 642 (1,090)
MED 471 (800) 471 (800)
LOW 377 (640) 377 (640)
QUIET 241 (410) 306 (520)
Heating
HIGH 506 (860) 594 (1,010)
MED 406 (690) 506 (860)
LOW 330 (560) 377 (640)
QUIET 247 (420) 306 (520)
Type × Qty Crossflow fan × 1
Motor output W 59
Sound pressure level*4
Cooling
HIGH
dB (A)
44 49
MED 42
LOW 37
QUIET 26 31
Heating
HIGH 43 47
MED 39 43
LOW 34 37
QUIET 28 32
Heat exchanger type
Dimensions (H × W × D) in (mm)
Main1: 8-1/4 × 31-5/16 × 1-1/16 (210 × 796 × 26.6)
Main2: 4-15/16 × 31-5/16 × 1-1/16 (126 × 796 × 26.6)
Sub1: 3-5/16 × 31-5/16 × 1/2 (84 × 796 × 13.3)
Fin pitch FPI
Man1: 21
Main2: 21
Sub1: 18
Rows × Stages
Main1: 2 × 10
Main2: 2 × 6
Sub1: 1 × 4
Pipe type Copper
Fin type Aluminum
Enclosure
Material Polystyrene
Color White
Approximate color of Munsell N 9.25/
Dimensions
(H × W × D)
Net in (mm) 11 × 38-9/16 × 9-7/16 (280 × 980 × 240)
Gross 12-11/16 × 42-7/16 × 13-5/8 (322 × 1,078 × 346)
Weight Net lb (kg) 29 (13)
Gross 37 (17)
Connection pipe Size Liquid in (mm) Ø1/4 (Ø6.35)
Gas Ø1/2 (Ø12.7)
Method Flare
Drain hose Material PP+HDPE
Tip diameter in (mm) Ø17/32 (Ø13.8) (I.D.), Ø5/8 to 21/32 (Ø15.8 to 16.7) (O.D.)
1-1. Indoor unit - (01-1) - 1. Specifications
GENERAL INFORMATION GENERAL INFORMATION

Type Wall mounted
Inverter heat pump
Model name ASUH18LPAS ASUH24LPAS
Operation range Cooling °F (°C) 64 to 90 (18 to 32) %RH 80 or less
Heating °F (°C) 86 or less (30 or less)
Remote controller type Wireless (Wired, Mobile app*5 [FGLair™] [option])
NOTES:
• Specifications are based on the following conditions:
– Cooling: Indoor temperature of 80°FDB (26.67°CDB)/67°FWB (19.44°CWB), and outdoor temperature of 95°FDB (35°CDB)/75°FWB (23.9°CWB).
– Heating: Indoor temperature of 70°FDB (21.11°CDB)/59°FWB (15.56°CWB), and outdoor temperature of 47°FDB (8.33°CDB)/43°FWB (6.11°CWB).
– *1: Heating (17°F): Indoor temperature of 70°FDB (21.11°CDB) /60°FWB (15.56°CWB), and outdoor temperature of 17°FDB (-8.33°CDB)/15°FWB (-9.44°CWB).
– *2: Heating (5°F): Indoor temperature of 70°FDB (21.11°CDB)/60°FWB (15.56°CWB), and outdoor temperature of 5°FDB (-15.0°CDB)/4°FWB (-15.56°CWB).
– Test conditions are based on AHRI 210/240 2023.
– Pipe length: 25 ft (7.5 m), Height difference: 0 ft (0 m). (Between outdoor unit and indoor unit.)
• Protective function might work when using it outside the operation range.
• *3: Maximum current is maximum value when operated within the operation range.
• *4: Sound pressure level:
– Measured values in manufacturer’s anechoic chamber.
– Because of the surrounding sound environment, the sound levels measured in actual installation conditions might be higher than the specified values here.
• *5: Available on Google Play™ store or on App Store®. Optional WLAN Adapter is also required. For details, refer to the setting manual.
M condition
Model name ASUH18LPAS ASUH24LPAS
Capacity
Cooling
Rated kW 5.28 7.03
Btu/h 18,000 24,000
Min.—Max. kW 1.17—5.57 1.17—7.15
Btu/h 4,000—19,000 4,000—24,400
Heating
Rated kW 5.28 7.03
Btu/h 18,000 24,000
Min.—Max. kW 0.82—7.03 0.85—8.50
Btu/h 2,800—24,000 2,900—29,000
Heating (17°F)*
Rated kW 3.28 4.51
Btu/h 11,200 15,400
Max. kW 4.40 5.57
Btu/h 15,000 19,000
Input power
Cooling Rated
kW
1.50 2.60
Min.—Max. 0.15—1.90 0.15—3.20
Heating Rated 1.33 2.07
Min.—Max. 0.15—2.10 0.15—3.10
Heating (17°F)* Rated 1.12 1.58
Max. 1.70 2.20
Current Cooling Rated A 6.7 11.4
Heating 5.9 9.1
EER Cooling kW/kW 3.52 2.70
Btu/hW 12.0 9.2
COP Heating kW/kW 3.96 3.40
Btu/hW 13.5 11.6
SEER Cooling Btu/hW 20.0 19.0
HSPF Heating Btu/hW 11.0
Power factor Cooling %97.3 99.2
Heating 98.0 98.9
NOTES:
Specifications are based on the following conditions:
• Cooling: Indoor temperature of 80°FDB (26.67°CDB)/67°FWB (19.44°CWB), and outdoor temperature of 95°FDB (35°CDB)/75°FWB (23.9°CWB).
• Heating: Indoor temperature of 70°FDB (21.11°CDB)/59°FWB (15.56°CWB), and outdoor temperature of 47°FDB (8.33°CDB)/43°FWB (6.11°CWB).
• *: Heating (17°F): Indoor temperature of 70°FDB (21.11°CDB)/60°FWB (15.56°CWB), and outdoor temperature of 17°FDB (-8.33°CDB)/15°FWB (-9.44°CWB).
• Test conditions are based on AHRI 210/240 2017.
• Pipe length: 25 ft (7.5 m), Height difference: 0 ft (0 m). (Between outdoor unit and indoor unit.)
1-1. Indoor unit - (01-2) - 1. Specifications
GENERAL INFORMATION GENERAL INFORMATION

1-2. Outdoor unit
Type Inverter heat pump
Model name AOUH18LPAS1 AOUH24LPAS1
Power supply 208/230 V ~ 60 Hz
Power supply intake Outdoor unit
Available voltage range 187—253 V
Starting current A 6.7 11.4
Fan
Airflow rate Cooling CFM (m3/h) 1,348 (2,290) 1,560 (2,650)
Heating 1,348 (2,290) 1,560 (2,650)
Type × Q'ty Propeller fan × 1
Motor output W 49
Sound pressure level *1 Cooling dB (A) 50 53
Heating 50 54
Heat exchanger type
Dimensions
(H × W × D) in (mm) Main1: 23-1/8 × 34-11/16 × 11/16 (588 × 881 × 18.19) Main2: 23-1/8 ×33-1/2 × 11/16 (588 × 851 × 18.19)
Fin pitch FPI 20
Rows × Stages Main1: 1 × 28
Main2: 1 × 28
Pipe type Copper
Fin type Type (Material) Aluminum
Surface treatment PC fin
Compressor Type DC rotary
Motor output W 1,030
Refrigerant
Type R410A
Charge lb oz 2 lb 16 oz
g 1,350
Refrigerant oil Type RB68
Amount in3 (cm3)24.4 (400)
Enclosure
Material Steel sheet
Color Beige
Approximate color of Munsell 10YR 7.5/1.0
Dimensions
(H × W × D)
Net in (mm) 24-7/8 × 31-7/16 × 11-7/16 (632 × 799 × 290)
Gross 27-1/4 × 37 × 14-3/4 (692 × 940 × 375)
Weight Net lb (kg) 86 (39)
Gross 95 (43)
Connection pipe
Size Liquid in (mm) Ø 1/4 (Ø 6.35)
Gas Ø 1/2 (Ø 12.7)
Method Flare
Pre-charge length
ft (m)
49 (15)
Max. length 66 (20)
Max. height difference 49 (15)
Operation range Cooling °F (°C) 14 to 115 (-10 to 46)
Heating 5 to 75 (-15 to 24)
Drain hose Material PP
Tip diameter in (mm) Ø 1/2 (Ø 13.0) (I. D.), Ø 5/8 to 11/16 (Ø 16.0 to 16.8) (O. D.)
NOTES:
• Specifications are based on the following conditions:
– Cooling: Indoor temperature of 80 °FDB (26.67 °CDB) / 67 °FWB (19.44 °CWB), and outdoor temperature of 95 °FDB (35 °CDB) / 75 °FWB (23.9 °CWB).
– Heating: Indoor temperature of 70 °FDB (21.11 °CDB) / 59 °FWB (15 °CWB), and outdoor temperature of 47 °FDB (8.33 °CDB) / 43 °FWB (6.11 °CWB).
– Pipe length: 24 ft 6 in (7.5 m), Height difference: 0 ft (0 m). (Between outdoor unit and indoor unit.)
• Protective function might work when using it outside the operation range.
• *1: Sound pressure level
– Measured values in manufacturer’s anechoic chamber.
– Because of the surrounding sound environment, the sound levels measured in actual installation conditions might be higher than the specified values here.
1-2. Outdoor unit - (01-3) - 1. Specifications
GENERAL INFORMATION GENERAL INFORMATION

2. Dimensions
2-1. Indoor unit
¢Models: ASUH18LPAS and ASUH24LPAS
Unit: in (mm)
38-9/16 (980) 9-7/16 (240)
11 (280)
for pipe inlet
Ø3-1/8 (80)
1-15/16 (50) 1-15/16 (50)
2-3/8 (60) 16-15/16 (430)
2-1/16 (52)
Outline of indoor unit
for pipe inlet
Ø3-1/8 (80)
2-13/16
(72)
16-7/16 (418)
3-9/16
(91)
15-3/4 (400) 3-9/16
(90)
16-1/4 (413)3-1/16
(77)
16-7/16 (417)
19 (482)
20-1/16 (510)
2-1. Indoor unit - (01-4) - 2. Dimensions
GENERAL INFORMATION GENERAL INFORMATION

Installation space requirement
Provide sufficient installation space for product safety.
Unit: in (mm)
60 (1,500) or more
71 (1,800) or more
2 (50) or more
2 (40) or more
5 (117) or more
3 (71) or more
3 (70) or more
7 (160) or more
Wall hook bracket
Outline of the indoor unit
2-1. Indoor unit - (01-5) - 2. Dimensions
GENERAL INFORMATION GENERAL INFORMATION

2-2. Outdoor unit
¢Models: AOUH18LPAS1 and AOUH24LPAS1
Side viewSide view Front view
Top view
22-13/16 (580)
31-7/16 (799)3/4 (19) 2-11/16 (68) 1/2 (13) 11-7/16 (290)
1-5/16 (33) 1-3/16 (30)
4-5/16 (109)
13-7/8 (353)
24-7/8 (632)
13/16 (20)
13 (330)
Pitch of bolts for installation
Pitch of bolts for installation
4-
M1 0 hole
Unit: in (mm)
Side view (Valve part)
4-3/4 (120)
4-1/4 (184)
7-1/16 (180)
Bottom view
Airflow
Drain port Ø1-5/8 (42)
1-7/16 (37)
15-11/16 (399)
2-2. Outdoor unit - (01-6) - 2. Dimensions
GENERAL INFORMATION GENERAL INFORMATION

2. TECHNICAL DATA AND PARTS LIST
2021.07.04
SR_CH02_AS051EF_01

CONTENTS
2. TECHNICAL DATA AND PARTS LIST
1. Precautions..................................................................................................02-1
2. Indoor unit parts list....................................................................................02-2
2-1. Models: ASUH18LPAS and ASUH24LPAS....................................................................02-2
3. Outdoor unit parts list.................................................................................02-6
3-1. Models: AOUH18LPAS1 and AOUH24LPAS1 ...............................................................02-6
4. Accessories ...............................................................................................02-10
4-1. Indoor unit ....................................................................................................................02-10
4-2. Outdoor unit..................................................................................................................02-10
5. Optional parts ...........................................................................................02-11
5-1. Indoor unit ....................................................................................................................02-11
6. Refrigerant system diagrams...................................................................02-13
6-1. Models: AOUH18LPAS1 and AOUH24LPAS1 .............................................................02-13
7. Wiring diagrams ........................................................................................02-14
7-1. Indoor unit ....................................................................................................................02-14
7-2. Outdoor unit..................................................................................................................02-15
8. PC board diagrams ...................................................................................02-16
8-1. Models: ASUH18LPAS and ASUH24LPAS..................................................................02-16
8-2. Models: AOUH18LPAS1 and AOUH24LPAS1 .............................................................02-17

1. Precautions
When you start servicing, pay attention to the following points. For detailed precautions, refer to the
installation manual of the products.
CAUTION
• Service personnel
– Any person who is involved with working on or breaking into a refrigerant circuit should hold a
current valid certificate from an industry-accredited assessment authority, which authorizes
their competence to handle refrigerants safely in accordance with an industry recognized as-
sessment specification.
– Servicing shall only be performed as recommended by the equipment manufacturer. Mainte-
nance and repair requiring the assistance of other skilled personnel shall be carried out under
the supervision of the person competent in the use of flammable refrigerants.
– Servicing shall be performed only as recommended by the manufacturer.
• Work
– Work in confined spaces shall be avoided.
– The area around the workspace shall be sectioned off.
– Electric shock may occur. After turning off the power, always wait 5 minutes before touching
electrical components.
– Do not touch the fins of the heat exchanger. Touching the heat exchanger fins could result in
damage to the fins or personal injury such as skin rupture.
– Do not place any other electrical products or household belongings under the product.
– Condensation dripping from the product might get them wet, and may cause damage or mal-
function to the property.
• Service parts information and design are subject to change without notice for product improve-
ment.
• For the latest information of the service parts, refer to our Service Portal.
https://fujitsu-general.force.com/portal/
• Precise figure of the service parts listed in this manual may differ from the actual service parts.
- (02-1) - 1. Precautions
TECHNICAL DATA AND PARTS LIST TECHNICAL DATA AND PARTS LIST

2. Indoor unit parts list
2-1. Models: ASUH18LPAS and ASUH24LPAS
¢Exterior parts and Accessories
1
2
2
5
7
8
10
11
12
13
14
15
18
17
19 20
a
b
c
15
16
8
9
3
6
4
2-1. Models: ASUH18LPAS and ASUH24LPAS - (02-2) - 2. Indoor unit parts list
TECHNICAL DATA AND PARTS LIST TECHNICAL DATA AND PARTS LIST

Item no. Part no. Part name Service part
1 9388158013 Bracket panel ♦
2 9387476002 Screw cover ♦
3 9313951047 Conduit holder ♦
4 9383729027 Wire cover B ♦
5 9387597035 Wire cover assy ♦
6 9383765056 WLAN adapter holder assy ♦
7 9387479010 U/D louver assy ♦
8 9332911008 Electric filter holder ♦
9 9323341036 Under cover L ♦
10 9317250009 Air clean filter assy ♦
11 9334126011 Remote controller ♦
12 9334098004 Remote controller holder ♦
13 9384977038 Front panel total assy ♦
14 9387756210 Intake grille assy ♦
15 9323340008 Air filter ♦
16 9333719009 Grille clamper L ♦
17 9333704005 Grille clamper R ♦
18 9323342033 Under cover R ♦
19 9383730030 Louver spring ♦
20 9333608006 Bush ♦
— 9901010071 Wire with connector
(CN75 on main PCB—WLAN adapter) ♦
a— Front panel —
b— Panel cover —
c— Front panel B —
2-1. Models: ASUH18LPAS and ASUH24LPAS - (02-3) - 2. Indoor unit parts list
TECHNICAL DATA AND PARTS LIST TECHNICAL DATA AND PARTS LIST

¢Chassis
51
50
61
60
59
d
e
70
66
a
53
b
52
54
55
56
58
c
68
67
69
64
65
63
62
57
2-1. Models: ASUH18LPAS and ASUH24LPAS - (02-4) - 2. Indoor unit parts list
TECHNICAL DATA AND PARTS LIST TECHNICAL DATA AND PARTS LIST

Item no. Part no. Part name Service part
50 9383735165 Evaporator total assy (for 18 model) ♦
9383735189 Evaporator total assy (for 24 model) ♦
51 9387467000 Room thermistor holder ♦
52 9901013010 Terminal ♦
53 9711732064 Main PCB (for 18 model) ♦
9711732071 Main PCB (for 24 model) ♦
54 9900627041 Thermistor assy ♦
55 9711146052 Display assy ♦
56 9711147011 Indicator PCB ♦
57 9387589054 Motor case assy ♦
58 9603821005 Brushless motor ♦
59 9383565007 Pipe bracket ♦
60 9387488043 Cable guide ♦
61 9387714012 Gear case assy ♦
62 9901011016 Stepping motor ♦
63 9383728006 R and L louver SPM assy ♦
64 9901011023 Stepping motor ♦
65 9387590142 Drain pan total assy ♦
66 9316904002 Drain hose assy ♦
67 9316177017 Drain cap ♦
68 9333628004 Bearing D assy ♦
69 9387055054 Crossflow fan assy ♦
70 9387587173 Base assy ♦
a— Control box —
b— Control cover —
c— Display case —
d— Motor case —
e— Motor cover assy —
2-1. Models: ASUH18LPAS and ASUH24LPAS - (02-5) - 2. Indoor unit parts list
TECHNICAL DATA AND PARTS LIST TECHNICAL DATA AND PARTS LIST

3. Outdoor unit parts list
3-1. Models: AOUH18LPAS1 and AOUH24LPAS1
¢Exterior parts and chassis
14
9
a
10
16
18
21
20
8
1
2
6
5
13 11
12
b
4
17
3
7
15
3-1. Models: AOUH18LPAS1 and AOUH24LPAS1 - (02-6) - 3. Outdoor unit parts list
TECHNICAL DATA AND PARTS LIST TECHNICAL DATA AND PARTS LIST