Fujitsu ASU18RLF Service manual

AIR CONDITIONER
Wall mounted type
DESIGN & TECHNICAL MANUAL
For Extra Cold Climate Area
INDOOR
ASU18RLF
ASU24RLF
OUTDOOR
AOU18RLXFWH
AOU24RLXFWH
DR_AS014EF_04
2017.03.10

Notices:
• Product specifications and design are subject to change without notice for future improvement.
• For further details, please check with our authorized dealer.
Copyright © 2016, 2017 Fujitsu General Limited. All rights reserved.

CONTENTS
Part 1. INDOOR UNIT....................................................................... 1
1. Specifications............................................................................................2
2. Dimensions................................................................................................3
2-1. Models: ASU18RLF and ASU24RLF .......................................................................... 3
3. Wiring diagrams ........................................................................................5
3-1. Models: ASU18RLF and ASU24RLF .......................................................................... 5
4. Capacity table............................................................................................6
4-1. Cooling capacity.......................................................................................................... 6
4-2. Heating capacity ......................................................................................................... 8
5. Fan performance .......................................................................................9
5-1. Air velocity distributions............................................................................................... 9
5-2. Airflow ....................................................................................................................... 12
6. Operation noise (sound pressure).........................................................14
6-1. Noise level curve....................................................................................................... 14
6-2. Sound level check point ............................................................................................ 15
7. Safety devices .........................................................................................16
8. External input and output.......................................................................17
8-1. External input ............................................................................................................ 17
8-2. External output.......................................................................................................... 19
9. Remote controller ...................................................................................20
9-1. Wireless remote controller ........................................................................................ 20
10. Function settings ....................................................................................22
10-1.Function settings by using remote controller............................................................ 22
11. Accessories.............................................................................................29
12. Optional parts..........................................................................................30
12-1.Controllers ............................................................................................................... 30
12-2.Others ...................................................................................................................... 30

Part 2. OUTDOOR UNIT................................................................. 31
1. Specifications..........................................................................................32
2. Dimensions..............................................................................................33
2-1. Models: AOU18RLXFWH and AOU24RLXFWH....................................................... 33
3. Installation space .................................................................................... 34
3-1. Models: AOU18RLXFWH and AOU24RLXFWH....................................................... 34
4. Refrigerant circuit ...................................................................................37
4-1. Models: AOU18RLXFWH and AOU24RLXFWH....................................................... 37
5. Wiring diagrams ...................................................................................... 38
5-1. Model: AOU18RLXFWH ........................................................................................... 38
5-2. Model: AOU24RLXFWH ........................................................................................... 39
6. Capacity compensation rate for pipe length and height difference.... 40
6-1. Models: AOU18RLXFWH and AOU24RLXFWH....................................................... 40
7. Additional charge calculation ................................................................41
7-1. Models: AOU18RLXFWH and AOU24RLXFWH....................................................... 41
8. Airflow......................................................................................................42
8-1. Model: AOU18RLXFWH ........................................................................................... 42
8-2. Model: AOU24RLXFWH ........................................................................................... 42
9. Operation noise (sound pressure).........................................................43
9-1. Noise level curve....................................................................................................... 43
9-2. Sound level check point ............................................................................................ 44
10. Electrical characteristics........................................................................45
11. Safety devices .........................................................................................46
12. Accessories .............................................................................................47
CONTENTS (continued)

Part 1. INDOOR UNIT
WALL MOUNTED TYPE:
ASU18RLF
ASU24RLF

1. Specifications
Type
Wall mounted
Inverter heat pump
Model name ASU18RLF ASU24RLF
Power supply 208/230 V ~ 60 Hz
Available voltage range 187—253 V
Capacity
Cooling
Rated kW 5.28 6.44
Btu/h 18,000 22,000
Min.—Max. kW 2.05—6.74 2.90—8.00
Btu/h 7,000—23,000 9,900—27,300
Heating
Rated kW 6.30 7.38
Btu/h 21,600 25,200
Min.—Max. kW 2.05—8.50 2.20—10.61
Btu/h 7,000—29,000 7,500—36,200
Input power
Cooling Rated
kW
1.35 1.76
Min.—Max. 0.50—3.01 0.58—3.42
Heating Rated 1.75 1.94
Min.—Max. 0.48—3.23 0.50—3.53
Current Cooling Rated A 6.2 7.9
Heating 7.8 8.6
EER Cooling kW/kW 3.90 3.66
Btu/hW 13.3 12.5
COP Heating kW/kW 3.62 3.80
Btu/hW 12.3 13.0
SEER Cooling Btu/hW 20.0 19.5
HSPF Heating Btu/hW 10.4 10.5
Power factor Cooling %95.0 97.0
Heating 97.6 98.1
Moisture removal pints/h (L/h) 5.9 (2.8) 6.3 (3.0)
Maximum operating current *1 Cooling A13.5 15.0
Heating 14.5 15.5
Fan
Airflow rate
Cooling
HIGH
CFM (m3/h)
541 (920) 659 (1,120)
MED 435 (740) 530 (900)
LOW 365 (620) 435 (740)
QUIET 306 (520) 365 (620)
Heating
HIGH 541 (920) 677 (1,150)
MED 435 (740) 530 (900)
LOW 365 (620) 435 (740)
QUIET 318 (540) 365 (620)
Type × Q'ty Cross flow fan × 1
Motor output W 53
Sound pressure level *2
Cooling
HIGH
dB (A)
43 49
MED 37 42
LOW 33 37
QUIET 28 33
Heating
HIGH 44 49
MED 37 42
LOW 33 37
QUIET 28 33
Heat exchanger type
Dimensions (H × W × D) in (mm) Main: 14-7/8 × 32-3/4 × 1-1/16 (378 × 832 × 26.6)
Sub: 3-5/16 × 32-3/4 × 1/2 (84 × 832 × 13.3)
Fin pitch FPI Main: 21, Sub: 18
Rows × Stages Main: 2 × 18, Sub: 1 × 4
Pipe type Copper tube
Fin type Aluminum
Enclosure
Material Polystyrene
Color White
Approximate color of Munsell N 9.25/
Dimensions
(H × W × D)
Net in 12-5/8 × 39-5/16 × 9
mm 320 × 998 × 228
Gross in 12-9/16 × 42-15/16 × 16-7/8
mm 319 × 1,090 × 429
Weight Net lb (kg) 31 (14)
Gross 40 (18)
Connection pipe Size Liquid in (mm) Ø 3/8 (Ø 9.52) Gas Ø 5/8 (Ø 15.88)
Method Flare
Drain hose Material PVC
Size in (mm) Ø 15/32 (Ø 12) (I.D.), Ø 5/8 (Ø 16) (O.D.)
Operation range Cooling °F (°C) 64 to 90 (18 to 32) %RH 80 or less
Heating °F (°C) 88 (30) or less
Remote controller type Wireless (Wired [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 °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: Maximum current is maximum value when operated within the operation range.
• *2: 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.
DESIGN & TECHNICAL MANUAL
- 2 -
WALL MOUNTED ASU18, 24RLF

2. Dimensions
2-1. Models: ASU18RLF and ASU24RLF
Unit: in (mm)
39-5/16 (998)
17-5/16 (439)
17-1/4 (438) 15-5/8 (397)
12-5/8 (320): Unit size
10-9/16 (269)
13/16 (20)
1-7/16 (37)
1 x 7/16 (26 x 11) hole
3/16 x 11/16 (5 x 18): 14 holes
13/16 x 3/16 (21 x 5): 14holes
3/16 x 1-15/16 (5 x 50): 3 holes
1/2 x 3/16 (13 x 5): 4 holes
ø3-1/8 (80) hole
ø3/16 (5): 65 holes
39-3/8 (1,000): Unit size
Piping inlet
for tapping screw
11/16 x 7/16 (18 x 11) hole
11/16 x 7/16 (18 x 11) hole
4-13/16 (122) 6-3/4 (172)
2-15/16 (75)
15-1/4 (387)
6-11/16 (170)
5/8 (16)
15-3/4 (400)
Unit center
4-15/16 (126)
5-1/4 (133)
5-1/8 (130)
4-7/16 (113)
2-15/16 (75)
9-9/16 (243)
9 (228)
12-5/8 (320)
20-1/2 (520)
23-1/4 (590)
28-3/8 (721)
ø3-1/8 (80) hole
Piping inlet
1-3/16 (30)
1-3/16 (30)
5-7/8 (149)
7-3/4 (197)
10-11/16 (272)
1-1/8 (44)
1/2
(12)
1/2 (13)
1 x 7/16 (26 x 11) hole
1 (25)
ø1-1/4 (32)
ø5/8 (16)
ø1/2 (12)
- 3 -
WALL MOUNTED ASU18, 24RLF

¢Installation space requirement
Provide sufficient installation space for product safety.
Unit: in (mm)
3 (63) or more
4 (80) or more
3 (52) or more 3 (53) or more
4 (80) or more
Outline of unit
5 (120) or more
60 (1,500) or more
71 (1,800) or more
DESIGN & TECHNICAL MANUAL
- 4 -
WALL MOUNTED ASU18, 24RLF

3. Wiring diagrams
3-1. Models: ASU18RLF and ASU24RLF
- 5 -
WALL MOUNTED ASU18, 24RLF

4. Capacity table
Capacity tables show each of following values calculated based on the outdoor temperature and
the indoor temperature, under given Airflow Rate (AFR):
For cooling capacity: Total Capacity (TC), Sensible Heat Capacity (SHC), and Input Power (IP)
For heating capacity: Total Capacity (TC) and Input Power (IP)
4-1. Cooling capacity
¢Model: ASU18RLF
AFR CFM 541
Indoor temperature
°FDB 64 70 75 80 85 90
°FWB 54 60 63 67 71 73
Outdoor temperature
°FDB TC SHC IP TC SHC IP TC SHC IP TC SHC IP TC SHC IP TC SHC IP
kBtu kW kBtu kW kBtu kW kBtu kW kBtu kW kBtu kW
-5 17.81 11.45 0.29 19.85 11.51 0.29 21.88 12.56 0.29 22.55 13.56 0.30 23.89 13.52 0.30 25.27 14.39 0.30
5 17.80 11.47 0.36 19.83 11.54 0.36 21.86 12.58 0.36 22.53 13.59 0.37 23.87 13.54 0.37 25.24 14.42 0.37
14 17.77 11.20 0.42 19.79 11.27 0.43 21.84 12.29 0.43 22.49 13.28 0.44 23.85 13.23 0.44 25.19 14.09 0.44
23 17.77 11.43 0.49 19.77 11.50 0.50 21.82 12.54 0.50 22.49 13.55 0.51 23.85 13.48 0.51 25.17 14.36 0.52
32 17.74 11.64 0.56 19.77 11.71 0.57 21.82 12.77 0.57 22.47 13.80 0.58 23.82 13.75 0.58 25.14 14.65 0.59
41 17.74 11.18 0.62 19.75 11.27 0.63 21.80 12.27 0.64 22.47 13.26 0.65 23.82 13.21 0.65 25.14 14.07 0.66
50 17.70 11.41 0.71 19.70 11.50 0.72 21.75 12.54 0.73 22.40 13.55 0.73 23.75 13.48 0.74 25.07 14.36 0.74
59 17.37 11.16 0.78 19.35 11.23 0.79 21.33 12.25 0.80 21.97 13.24 0.81 23.30 13.17 0.81 24.60 14.02 0.82
67 16.65 10.85 0.92 18.56 10.92 0.93 20.47 11.91 0.95 21.09 12.86 0.95 22.35 12.83 0.96 23.61 13.65 0.97
77 15.90 10.54 1.06 17.74 10.61 1.07 19.55 11.57 1.09 20.13 12.49 1.09 21.36 12.45 1.11 22.55 13.27 1.12
87 15.12 10.20 1.19 16.82 10.27 1.21 18.56 11.19 1.23 19.14 12.11 1.23 20.27 12.04 1.25 21.43 12.83 1.26
95 14.23 9.86 1.30 15.87 9.93 1.32 17.47 10.82 1.34 18.02 11.67 1.35 19.11 11.63 1.36 20.16 12.39 1.38
104 13.58 9.59 1.45 15.12 9.66 1.47 16.65 10.54 1.49 17.16 11.36 1.50 18.22 11.33 1.51 19.24 12.08 1.53
115 12.39 9.14 1.62 13.78 9.18 1.65 15.22 10.03 1.67 15.66 10.82 1.68 16.62 10.78 1.70 17.57 11.50 1.72
AFR m3/h 920
Indoor temperature
°CDB 17.8 21.1 23.9 26.7 29.4 32.2
°CWB 12.2 15.6 17.2 19.4 21.7 22.8
Outdoor temperature
°CDB TC SHC IP TC SHC IP TC SHC IP TC SHC IP TC SHC IP TC SHC IP
kW kW kW kW kW kW
-20.6 5.22 3.36 0.29 5.82 3.37 0.29 6.41 3.68 0.29 6.61 3.97 0.30 7.00 3.96 0.30 7.41 4.22 0.30
-15.0 5.22 3.36 0.36 5.81 3.38 0.36 6.41 3.69 0.36 6.60 3.98 0.37 7.00 3.97 0.37 7.40 4.23 0.37
-10.0 5.21 3.28 0.42 5.80 3.30 0.43 6.40 3.60 0.43 6.59 3.89 0.44 6.99 3.88 0.44 7.38 4.13 0.44
-5.0 5.21 3.35 0.49 5.79 3.37 0.50 6.40 3.68 0.50 6.59 3.97 0.51 6.99 3.95 0.51 7.38 4.21 0.52
0.0 5.20 3.41 0.56 5.79 3.43 0.57 6.40 3.74 0.57 6.59 4.05 0.58 6.98 4.03 0.58 7.37 4.29 0.59
5.0 5.20 3.28 0.62 5.79 3.30 0.63 6.39 3.60 0.64 6.59 3.89 0.65 6.98 3.87 0.65 7.37 4.12 0.66
10.0 5.19 3.34 0.71 5.77 3.37 0.72 6.37 3.68 0.73 6.56 3.97 0.73 6.96 3.95 0.74 7.35 4.21 0.74
15.0 5.09 3.27 0.78 5.67 3.29 0.79 6.25 3.59 0.80 6.44 3.88 0.81 6.83 3.86 0.81 7.21 4.11 0.82
19.4 4.88 3.18 0.92 5.44 3.20 0.93 6.00 3.49 0.95 6.18 3.77 0.95 6.55 3.76 0.96 6.92 4.00 0.97
25.0 4.66 3.09 1.06 5.20 3.11 1.07 5.73 3.39 1.09 5.90 3.66 1.09 6.26 3.65 1.11 6.61 3.89 1.12
30.6 4.43 2.99 1.19 4.93 3.01 1.21 5.44 3.28 1.23 5.61 3.55 1.23 5.94 3.53 1.25 6.28 3.76 1.26
35.0 4.17 2.89 1.30 4.65 2.91 1.32 5.12 3.17 1.34 5.28 3.42 1.35 5.60 3.41 1.36 5.91 3.63 1.38
40.0 3.98 2.81 1.45 4.43 2.83 1.47 4.88 3.09 1.49 5.03 3.33 1.50 5.34 3.32 1.51 5.64 3.54 1.53
46.1 3.63 2.68 1.62 4.04 2.69 1.65 4.46 2.94 1.67 4.59 3.17 1.68 4.87 3.16 1.70 5.15 3.37 1.72
DESIGN & TECHNICAL MANUAL
- 6 -
WALL MOUNTED ASU18, 24RLF

¢Model: ASU24RLF
AFR CFM 659
Indoor temperature
°FDB 64 70 75 80 85 90
°FWB 54 60 63 67 71 73
Outdoor temperature
°FDB TC SHC IP TC SHC IP TC SHC IP TC SHC IP TC SHC IP TC SHC IP
kBtu kW kBtu kW kBtu kW kBtu kW kBtu kW kBtu kW
-5 19.12 11.45 0.30 21.30 11.51 0.30 23.48 12.56 0.31 24.19 13.56 0.31 25.64 13.52 0.32 27.11 14.39 0.32
5 19.10 11.47 0.37 21.28 11.54 0.38 23.46 12.58 0.38 24.17 13.59 0.39 25.62 13.54 0.39 27.09 14.42 0.39
14 19.06 11.37 0.45 21.23 11.44 0.45 23.42 12.46 0.46 24.13 13.45 0.46 25.56 13.40 0.47 27.04 14.29 0.47
23 19.06 11.60 0.52 21.20 11.67 0.52 23.39 12.72 0.53 24.13 13.73 0.54 25.56 13.66 0.54 27.02 14.57 0.54
32 19.03 11.81 0.59 21.20 11.88 0.60 23.39 12.95 0.60 24.11 13.98 0.61 25.53 13.93 0.61 26.99 14.86 0.62
41 19.03 11.35 0.65 21.18 11.44 0.66 23.37 12.44 0.67 24.11 13.43 0.68 25.53 13.38 0.68 26.99 14.27 0.69
50 18.98 11.58 0.74 21.12 11.67 0.75 23.32 12.72 0.76 24.03 13.73 0.77 25.46 13.66 0.77 26.92 14.57 0.78
59 18.63 11.33 0.82 20.74 11.40 0.83 22.86 12.42 0.84 23.58 13.41 0.85 24.98 13.34 0.85 26.41 14.23 0.86
67 17.91 11.05 0.95 19.96 11.12 0.97 21.97 12.15 0.98 22.66 13.10 0.99 24.02 13.07 1.00 25.39 13.92 1.01
77 19.31 11.57 1.37 21.50 11.63 1.39 23.71 12.69 1.41 24.43 13.72 1.42 25.90 13.65 1.43 27.36 14.54 1.44
87 18.36 11.23 1.53 20.47 11.29 1.55 22.55 12.32 1.58 23.27 13.31 1.58 24.63 13.24 1.60 26.03 14.13 1.61
95 17.37 10.88 1.70 19.35 10.92 1.72 21.33 11.94 1.75 21.97 12.86 1.76 23.30 12.83 1.78 24.60 13.65 1.80
104 16.24 10.47 1.86 18.08 10.54 1.89 19.93 11.50 1.92 20.54 12.42 1.93 21.77 12.35 1.95 23.00 13.17 1.97
115 12.35 9.21 1.56 13.75 9.28 1.58 15.18 10.13 1.61 15.63 10.92 1.61 16.58 10.88 1.63 17.50 11.60 1.65
AFR m3/h 1,120
Indoor temperature
°CDB 17.8 21.1 23.9 26.7 29.4 32.2
°CWB 12.2 15.6 17.2 19.4 21.7 22.8
Outdoor temperature
°CDB TC SHC IP TC SHC IP TC SHC IP TC SHC IP TC SHC IP TC SHC IP
kW kW kW kW kW kW
-20.6 5.60 3.36 0.30 6.24 3.37 0.30 6.88 3.68 0.31 7.09 3.97 0.31 7.51 3.96 0.32 7.95 4.22 0.32
-15.0 5.60 3.36 0.37 6.24 3.38 0.38 6.88 3.69 0.38 7.08 3.98 0.39 7.51 3.97 0.39 7.94 4.23 0.39
-10.0 5.59 3.33 0.45 6.22 3.35 0.45 6.86 3.65 0.46 7.07 3.94 0.46 7.49 3.93 0.47 7.93 4.19 0.47
-5.0 5.59 3.40 0.52 6.21 3.42 0.52 6.86 3.73 0.53 7.07 4.02 0.54 7.49 4.00 0.54 7.92 4.27 0.54
0.0 5.58 3.46 0.59 6.21 3.48 0.60 6.86 3.80 0.60 7.07 4.10 0.61 7.48 4.08 0.61 7.91 4.36 0.62
5.0 5.58 3.33 0.65 6.21 3.35 0.66 6.85 3.65 0.67 7.07 3.94 0.68 7.48 3.92 0.68 7.91 4.18 0.69
10.0 5.56 3.39 0.74 6.19 3.42 0.75 6.83 3.73 0.76 7.04 4.02 0.77 7.46 4.00 0.77 7.89 4.27 0.78
15.0 5.46 3.32 0.82 6.08 3.34 0.83 6.70 3.64 0.84 6.91 3.93 0.85 7.32 3.91 0.85 7.74 4.17 0.86
19.4 5.25 3.24 0.95 5.85 3.26 0.97 6.44 3.56 0.98 6.64 3.84 0.99 7.04 3.83 1.00 7.44 4.08 1.01
25.0 5.66 3.39 1.37 6.30 3.41 1.39 6.95 3.72 1.41 7.16 4.02 1.42 7.59 4.00 1.43 8.02 4.26 1.44
30.6 5.38 3.29 1.53 6.00 3.31 1.55 6.61 3.61 1.58 6.82 3.90 1.58 7.22 3.88 1.60 7.63 4.14 1.61
35.0 5.09 3.19 1.70 5.67 3.20 1.72 6.25 3.50 1.75 6.44 3.77 1.76 6.83 3.76 1.78 7.21 4.00 1.80
40.0 4.76 3.07 1.86 5.30 3.09 1.89 5.84 3.37 1.92 6.02 3.64 1.93 6.38 3.62 1.95 6.74 3.86 1.97
46.1 3.62 2.70 1.56 4.03 2.72 1.58 4.45 2.97 1.61 4.58 3.20 1.61 4.86 3.19 1.63 5.13 3.40 1.65
- 7 -
WALL MOUNTED ASU18, 24RLF

4-2. Heating capacity
¢Model: ASU18RLF
AFR CFM 541
Indoor temperature
°FDB 60 65 70 72 75
Outdoor temperature
°FDB °FWB TC IP TC IP TC IP TC IP TC IP
kBtu kW kBtu kW kBtu kW kBtu kW kBtu kW
-15 -17 18.80 1.76 18.37 1.80 17.91 1.83 17.46 1.87 17.02 1.90
-5 -7 20.67 2.28 20.20 2.33 19.70 2.37 19.19 2.42 18.72 2.46
5 3 22.67 2.65 22.13 2.70 21.60 2.75 21.06 2.80 20.53 2.85
14 12 23.46 2.82 22.89 2.88 22.37 2.93 21.80 2.99 21.24 3.04
23 19 24.70 3.01 24.12 3.07 23.51 3.13 22.93 3.19 22.35 3.25
32 28 27.47 3.02 26.82 3.08 26.17 3.14 25.52 3.20 24.87 3.26
41 37 29.31 2.84 28.59 2.90 27.91 2.96 27.23 3.02 26.51 3.08
47 43 30.47 2.87 29.72 2.93 29.00 2.99 28.29 3.05 27.57 3.11
50 47 30.98 2.85 30.26 2.91 29.51 2.97 28.76 3.03 28.05 3.09
59 50 29.24 2.48 28.56 2.53 27.84 2.58 27.16 2.63 26.44 2.68
AFR m3/h 920
Indoor temperature
°CDB 15.6 18.3 21.1 22.2 23.9
Outdoor temperature
°CDB °CWB TC IP TC IP TC IP TC IP TC IP
kW kW kW kW kW
-26.1 -27.2 5.51 1.76 5.38 1.80 5.25 1.83 5.12 1.87 4.99 1.90
-20.6 -21.7 6.06 2.28 5.92 2.33 5.77 2.37 5.63 2.42 5.49 2.46
-15.0 -16.1 6.64 2.65 6.49 2.70 6.33 2.75 6.17 2.80 6.02 2.85
-10.0 -11.1 6.87 2.82 6.71 2.88 6.56 2.93 6.39 2.99 6.22 3.04
-5.0 -7.2 7.24 3.01 7.07 3.07 6.89 3.13 6.72 3.19 6.55 3.25
0.0 -2.2 8.05 3.02 7.86 3.08 7.67 3.14 7.48 3.20 7.29 3.26
5.0 2.8 8.59 2.84 8.38 2.90 8.18 2.96 7.98 3.02 7.77 3.08
8.3 6.1 8.93 2.87 8.71 2.93 8.50 2.99 8.29 3.05 8.08 3.11
10.0 8.3 9.08 2.85 8.87 2.91 8.65 2.97 8.43 3.03 8.22 3.09
15.0 10.0 8.57 2.48 8.37 2.53 8.16 2.58 7.96 2.63 7.75 2.68
¢Model: ASU24RLF
AFR CFM 677
Indoor temperature
°FDB 60 65 70 72 75
Outdoor temperature
°FDB °FWB TC IP TC IP TC IP TC IP TC IP
kBtu kW kBtu kW kBtu kW kBtu kW kBtu kW
-15 -17 20.71 3.09 20.24 3.16 19.73 3.22 19.23 3.28 18.75 3.34
-5 -7 23.66 3.30 23.12 3.36 22.54 3.43 21.97 3.50 21.43 3.56
5 3 26.47 3.45 25.86 3.52 25.21 3.59 24.57 3.66 23.96 3.73
14 12 28.20 3.47 27.53 3.54 26.87 3.61 26.21 3.68 25.51 3.75
23 19 30.78 3.42 30.06 3.49 29.31 3.56 28.59 3.63 27.84 3.70
32 28 33.81 3.42 32.99 3.48 32.21 3.55 31.39 3.62 30.61 3.69
41 37 36.88 3.29 36.00 3.36 35.14 3.43 34.26 3.49 33.37 3.56
47 43 37.98 3.25 37.09 3.32 36.17 3.38 35.28 3.45 34.36 3.52
50 47 38.69 3.24 37.77 3.31 36.85 3.37 35.93 3.44 35.01 3.51
59 50 36.85 2.85 36.00 2.91 35.11 2.97 34.22 3.03 33.37 3.09
AFR m3/h 1,150
Indoor temperature
°CDB 15.6 18.3 21.1 22.2 23.9
Outdoor temperature
°CDB °CWB TC IP TC IP TC IP TC IP TC IP
kW kW kW kW kW
-26.1 -27.2 6.07 3.09 5.93 3.16 5.78 3.22 5.64 3.28 5.50 3.34
-20.6 -21.7 6.94 3.30 6.78 3.36 6.61 3.43 6.44 3.50 6.28 3.56
-15.0 -16.1 7.76 3.45 7.58 3.52 7.39 3.59 7.20 3.66 7.02 3.73
-10.0 -11.1 8.26 3.47 8.07 3.54 7.88 3.61 7.68 3.68 7.48 3.75
-5.0 -7.2 9.02 3.42 8.81 3.49 8.59 3.56 8.38 3.63 8.16 3.70
0.0 -2.2 9.91 3.42 9.67 3.48 9.44 3.55 9.20 3.62 8.97 3.69
5.0 2.8 10.81 3.29 10.55 3.36 10.30 3.43 10.04 3.49 9.78 3.56
8.3 6.1 11.13 3.25 10.87 3.32 10.60 3.38 10.34 3.45 10.07 3.52
10.0 8.3 11.34 3.24 11.07 3.31 10.80 3.37 10.53 3.44 10.26 3.51
15.0 10.0 10.80 2.85 10.55 2.91 10.29 2.97 10.03 3.03 9.78 3.09
DESIGN & TECHNICAL MANUAL
- 8 -
WALL MOUNTED ASU18, 24RLF

5. Fan performance
5-1. Air velocity distributions
¢Model: ASU18RLF
Measuring conditions Fan speed Operation mode
HIGH FAN
Top view
Vertical airflow direction louver: Up
Horizontal airflow direction louver: Center
2
1
0
1
2
(m)
(m)
Unit: ft/s (m/s)
012345678
(ft)
7142027
7
3
0
3
7
(ft)
7 (2) 3 (1) 2 (0.5)
Top view
Vertical airflow direction louver: Up
Horizontal airflow direction louver: Left & Right
3
2
1
0
1
2
3
(m)
(m)
Unit: ft/s (m/s)
01234 56 78
(ft)
7142027
10
7
3
0
3
7
10
(ft)
2 (0.5)
2 (0.5)
3 (1)
3 (1)
7 (2)
7 (2)
Side view
Vertical airflow direction louver: Up
Horizontal airflow direction louver: Center
3
2
1
0
(m)
(m)
Unit: ft/s (m/s)
0123456 78
(ft)
7142027
10
7
3
0
(ft)
7 (2)
3 (1)
2 (0.5)
- 9 -
WALL MOUNTED ASU18, 24RLF

Side view
Vertical airflow direction louver: Down
Horizontal airflow direction louver: Center
3
2
1
0
(m)
(m)
Unit: ft/s (m/s)
01234 56 78
(ft)
7142027
10
7
3
0
(ft)
7 (2)
3 (1)
2 (0.5)
DESIGN & TECHNICAL MANUAL
- 10 -
WALL MOUNTED ASU18, 24RLF

¢Model: ASU24RLF
Measuring conditions Fan speed Operation mode
HIGH FAN
Top view
Vertical airflow direction louver: Up
Horizontal airflow direction louver: Center
2
1
0
1
2
(m)
(m)
Unit: ft/s (m/s)
012345678
(ft)
7142027
7
3
0
3
7
(ft)
7 (2) 3 (1)
2 (0.5)
Top view
Vertical airflow direction louver: Up
Horizontal airflow direction louver: Left & Right
3
2
1
0
1
2
3
(m)
(m)
Unit: ft/s (m/s)
012345678
(ft)
7142027
10
7
3
0
3
7
10
(ft)
2 (0.5)
2 (0.5)
3 (1)
3 (1)
7 (2)
7 (2)
Side view
Vertical airflow direction louver: Up
Horizontal airflow direction louver: Center
3
2
1
0
(m)
(m)
Unit : ft/s (m/s)
012345678
(ft)
7142027
10
7
3
0
(ft)
7 (2)
3 (1)
2 (0.5)
Side view
Vertical airflow direction louver: Down
Horizontal airflow direction louver: Center
3
2
1
0
(m)
(m)
Unit: ft/s (m/s)
012345678
(ft)
7142027
10
7
3
0
(ft)
7 (2)
3 (1)
2 (0.5)
- 11 -
WALL MOUNTED ASU18, 24RLF

5-2. Airflow
¢Model: ASU18RLF
Cooling
Fan speed Airflow
HIGH
m3/h 920
l/s 256
CFM 541
MED
m3/h 740
l/s 206
CFM 435
LOW
m3/h 620
l/s 172
CFM 365
QUIET
m3/h 520
l/s 144
CFM 306
Heating
Fan speed Airflow
HIGH
m3/h 920
l/s 256
CFM 541
MED
m3/h 740
l/s 206
CFM 435
LOW
m3/h 620
l/s 172
CFM 365
QUIET
m3/h 540
l/s 150
CFM 318
DESIGN & TECHNICAL MANUAL
- 12 -
WALL MOUNTED ASU18, 24RLF

¢Model: ASU24RLF
Cooling
Fan speed Airflow
HIGH
m3/h 1,120
l/s 311
CFM 659
MED
m3/h 900
l/s 250
CFM 530
LOW
m3/h 740
l/s 206
CFM 435
QUIET
m3/h 620
l/s 172
CFM 365
Heating
Fan speed Airflow
HIGH
m3/h 1,150
l/s 319
CFM 677
MED
m3/h 900
l/s 250
CFM 530
LOW
m3/h 740
l/s 206
CFM 435
QUIET
m3/h 620
l/s 172
CFM 365
- 13 -
WALL MOUNTED ASU18, 24RLF

6. Operation noise (sound pressure)
6-1. Noise level curve
¢Model: ASU18RLF
Cooling
NC-65
NC-60
NC-55
NC-50
NC-45
NC-40
NC-35
NC-30
NC-25
NC-20
NC-15
Octave band sound pressure level, dB: (0 dB=0.0002 µbar)
Octave band center frequency, Hz
80
70
60
50
40
30
20
10
0
63 125 250 500 1,000 2,000 4,000 8,000
HIGH
QUIET
Heating
NC-65
NC-60
NC-55
NC-50
NC-45
NC-40
NC-35
NC-30
NC-25
NC-20
NC-15
Octave band sound pressure level, dB: (0 dB=0.0002 µbar)
Octave band center frequency, Hz
80
70
60
50
40
30
20
10
0
63 125 250 500 1,000 2,000 4,000 8,000
HIGH
QUIET
¢Model: ASU24RLF
Cooling
NC-65
NC-60
NC-55
NC-50
NC-45
NC-40
NC-35
NC-30
NC-25
NC-20
NC-15
Octave band sound pressure level, dB: (0 dB=0.0002 µbar)
Octave band center frequency, Hz
80
70
60
50
40
30
20
10
0
63 125 250 500 1,000 2,000 4,000 8,000
HIGH
QUIET
Heating
NC-65
NC-60
NC-55
NC-50
NC-45
NC-40
NC-35
NC-30
NC-25
NC-20
NC-15
Octave band sound pressure level, dB: (0 dB=0.0002 µbar)
Octave band center frequency, Hz
80
70
60
50
40
30
20
10
0
63 125 250 500 1,000 2,000 4,000 8,000
HIGH
QUIET
DESIGN & TECHNICAL MANUAL
- 14 -
WALL MOUNTED ASU18, 24RLF

6-2. Sound level check point
2 ft 7-5/8 in (0.8 m)
3 ft 3-3/8 in (1 m)
Microphone Microphone
NOTE: Detailed shape of the actual indoor unit might be slightly different from the one illustrated
above.
- 15 -
WALL MOUNTED ASU18, 24RLF

7. Safety devices
Type of protection Protection form Model
ASU18RLF ASU24RLF
Circuit protection Current fuse (PCB*) 250 V, 3.15 A
Terminal protection Current fuse 250 V, 3 A
Fan motor protection
Thermistor protection
Activate More than 185°F (85°C)
Fan motor speed down
Reset Less than 185°F (85°C)
Fan motor speed recover
Power IC thermal
shutdown protection
Activate 302±27°F (150±15°C)
Fan motor stop
Reset Less than 275°F (135°C)
Fan motor restart
*PCB: Printed Circuit Board
DESIGN & TECHNICAL MANUAL
- 16 -
WALL MOUNTED ASU18, 24RLF