Fujitsu ASU18RLF, ASU24RLF, AOU18RLXFWH, AOU24RLXFWH Design & Technical 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

A

13.5 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.

- 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

- 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

- 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

- 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)

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)

- 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)

012345678

(ft)

7142027

10

7

3

0

(ft)

7 (2)

3 (1)

2 (0.5)

- 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

- 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=0.0 002 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=0.0 002 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

- 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

- 16 -

WALL MOUNTED

ASU18, 24RLF

8. External input and output

With using external input and output functions, this product can be operated inter-connectedly
with an external device.

Connector Input Output Remarks

CN14 Control input —

See external input/output

settings for details.

CN16 — Operation status output

8-1. External input

With using external input function, some functions on this product can be controlled from an exter­nal device.

• “Operation/Stop” mode or "Forced stop" mode can be selected with function setting of indoor
unit.

• A twisted pair cable (22AWG) should be used. Maximum length of cable is 492 ft (150 m).

• The wire connection should be separate from the power cable line.

¢

Control input (Operation/Stop or Forced stop)

The air conditioner can be remotely operated by means of the following on-site work.
Unit operation is started at the following contents by adding the contact input of a commercial

on/off switch to a connector on the external control PCB and turning it on.

Unit operation Initial setting after power is on

Starting mode other than initial

setting

Operation mode Auto changeover Mode at previous operation
Set temperature 76 °F (24 °C) Temperature at previous operation

Airflow mode AUTO Mode at previous operation

Air direction (swing) Standard air direction (swing OFF) Air direction at previous operation

- 17 -

WALL MOUNTED

ASU18, 24RLF

 Circuit diagram example

Indoor unit

control PCB

Example: Switch

Locally purchased

Connected unit

1

3

Signal

Connector

*33 ft. (10 m)

• Contact capacity: DC 24 V or more, 10 mA or
more.

• *: Make the distance from the PCB to the con­nected unit within 33 ft (10 m).

• Use non-polar relays and switches.

• When function setting is "Operation/Stop" mode

Operation

Stop

On

Off

Input signal

Indoor unit

• When function setting is "Forced stop" mode

Remote controller

On On On

Input signal

Indoor unit

Command

Remote control
operation invalidity

On

Off

Operation

Stop

Forced stop

Normal

 Optional part

Part name Model name Exterior

External connect kit UTY-XWZX

External input wire

- 18 -

WALL MOUNTED

ASU18, 24RLF

8-2. External output

With using external output function, operating status of this product can be transmitted to the ex­ternal device, and also, this product can be inter-connected with the external device.

¢

Operation status output

Air conditioner operation status signal can be output.

 Circuit diagram example

Locally purchased

Indoor unit

control PCB

Connected unit

Example: Display

Example: Relay unit

Relay
power supply

DC 24 V

1

2

Signal

V

Connector

*33 ft
(10 m)

• *: Make the distance from the PCB to the connected unit within 33 ft (10 m).

• Relay spec: Max. DC 24 V, 10 mA to less than 500 mA.

On

Off

Operation

Stop

Indoor unit

Output signal

 Optional part

Part name Model name Exterior

External connect kit UTY-XWZX

External output wire

- 19 -

WALL MOUNTED

ASU18, 24RLF

9. Remote controller

9-1. Wireless remote controller

¢

Overview

o

p

j

k

l

n

m

b

d

e

a

f

i

g

h

c

Display panel

q

r

s

t

u

v

w

x

NOTE:

Functions may differ by type of the in­door unit. For details, refer to the oper­ation manual.

a

FAN button

Selects the fan speed (AUTO, HIGH, MED, LOW, and
QUIET).

b START/STOP button

Starts and stops operation.

c SET button (vertical)

Adjusts the vertical airflow direction.

d SET button (horizontal)

Adjusts the horizontal airflow direction.

e SWING button

Sets the automatic swing operation and selects swing
mode (Up/down, Left/right, Up/down/left/right, and Stop
swing).

f RESET button

Used when replacing batteries.

g Timer set (- / +) button

Sets the current time and on-off time.

h TEST RUN button

Only used for the initial test in the unit installation.

i CLOCK ADJUST button

Used for adjusting the clock.

j TIMER MODE button

Selects the timer mode (off timer, on timer, program
timer, and timer reset).

k SLEEP button

Pressed to select sleep timer.

l ECONOMY button
m MIN. HEAT button

n

SET TEMP. (temperature) (

/ ) button

• Sets desired temperature.

• Sets remote controller custom code.

o MODE button

• Switches operation mode (AUTO, COOL, DRY, FAN,
and HEAT).

• Starts/ends the remote controller custom code (max.
4 types) change.

p

Signal transmitter

q Signal transmit indicator
r Fan speed indicator
s Swing indicator
t Timer mode indicator
u Clock indicator
v Sleep indicator
w Operating mode indicator
x Temperature indicator

- 20 -

WALL MOUNTED

ASU18, 24RLF

¢

Specifications

 Controller

Unit: in (mm)

Front view Side view Rear view

6-11/16 (170)

3/4 (19)

2-3/16 (56)

Top view

Size (H × W × D) in (mm) 6-11/16 × 2-3/16 × 3/4 (170 × 56 × 19)
Weight oz (g) 3 (85) (without batteries)

NOTE: Actual number of buttons might be different from the figure above.

 Holder

Unit: in (mm)

Front view Side view Bottom view

2-3/8 (60.4)

1-3/16 (30.2)

Ø1/8 (3.5)

1/8 x 1/4 (3.5 x 6.5)

(hole)

(hole)

1-1/16

1

3-3/4 (95)

6-1/16 (154.7)

(25.5)

(26.2)

Size (H × W × D) in (mm) 6-1/16 × 2-3/8 × 1-1/16 (154.7 × 60.4 × 26.2)
Weight oz (g) 10 (28)

- 21 -

WALL MOUNTED

ASU18, 24RLF

10. Function settings

To adjust the functions of this product according to the installation environment, various types of
function settings are available.

NOTE:

Incorrect settings can cause a product malfunction.

10-1. Function settings by using remote controller

Some function settings can be changed on the remote controller. After confirming the setting pro­cedure and the content of each function setting, select appropriate functions for your installation
environment.

NOTE: Incorrect settings can cause a product malfunction.

¢

Setting procedure by using wireless remote controller

The function number and the associated setting value are displayed on the LCD of the remote
controller. Follow the instructions written in the local setup procedure supplied with the remote
controller, and select appropriate setting according to the installation environment.

Before connecting the power supply of the indoor unit, reconfirm following items:

• Piping air tight test and vacuuming have been performed firmly.

• There is no wiring mistake.

Then, connect the power supply of indoor unit.

Entering function setting mode:

While pressing the FAN button and SET TEMP. ( ) button simultaneously, press the RESET
button to enter the function setting mode.

STEP 1: Setting the remote controller custom code

Use the following steps to select the custom code of the remote controller. (Note that the air con­ditioner cannot receive a custom code if the air conditioner has not been set for the custom code.)

The custom codes that are set through this process are applicable only to the signal in the func­tion setting.

For details on how to set the custom codes through the normal process, refer to "Custom code

setting for wireless remote controller" on page 28.

1. Press the SET TEMP. (

) ( ) buttons to change the custom
code between → → → . Match the code on the display to
the air conditioner custom code. (Initially set to

.) If the custom
code does not need to be selected, press the MODE button, and
proceed to STEP 2.

2. Press the TIMER MODE button and check that the indoor unit can
receive signals at the displayed custom code.

3. Press the MODE button to accept the custom code, and proceed
to STEP 2.

4. After completing the function setting, be sure to disconnect the
power supply and then reconnect it.

NOTES:

•

The air conditioner custom code is set to “ ” prior to shipment.

•

The remote controller resets to custom code “ ” when the batteries on the remote controller
are replaced. If you use a custom code other than code “ ”, reset the custom code after re-

placing the batteries.

•

If you do not know the air conditioner custom code setting, try each of the custom codes ( →

→ → ) until you find the code that operates the air conditioner.

- 22 -

WALL MOUNTED

ASU18, 24RLF

STEP 2: Selecting the function number and setting value

1. Press the SET TEMP. ( ) ( ) buttons to select the function
number. To switch between the left and right digits, press the
MODE button.

2. Press the FAN button to proceed the setting value. To return the
function number selection, press the FAN button again.

3. Press the SET TEMP. ( ) ( ) buttons to select the setting value.
To switch between the left and right digits, press the MODE but­ton.

4. Press the TIMER MODE button, and START/STOP button, in the
order listed to confirm the settings.

5. Press the RESET button to cancel the function setting mode.

6. After completing the function setting, be sure to disconnect the
power supply and then reconnect it.

Function number

Setting value

CAUTION

After disconnecting the power supply, wait 30 seconds or more before reconnecting it. The func­tion setting will not become active unless the power supply is disconnected and then reconnect­ed.

- 23 -

WALL MOUNTED

ASU18, 24RLF

¢

Contents of function setting

Each function setting listed in this section is adjustable in accordance with the installation environ­ment.

NOTE:

Setting will not be changed if invalid numbers or setting values are selected.



Function setting list

Function no. Functions

1) 11 Filter sign

2) 30/31 Room temperature control for indoor unit sensor

3) 40 Auto restart

4) 42 Room temperature sensor switching

5) 44 Remote controller custom code

6) 46 External input control

7) 48 Room temperature sensor switching (Aux.)

8) 92/93 Room temperature control for wired remote controller sensor

9) 94 Fixed operation mode switching

10) 95 Heat insulation condition (building insulation)

1) Filter sign

Select appropriate intervals for displaying the filter sign on the indoor unit according to the esti­mated amount of dust in the air of the room.

If the indication is not required, select "No indication" (03).

Function number Setting value Setting description Factory setting

11

00 Standard (400 hours)
01 Long interval (1,000 hours)
02 Short interval (200 hours)
03 No indication ♦

- 24 -

WALL MOUNTED

ASU18, 24RLF

2) Room temperature control for indoor unit sensor

NOTE: Before performing this setting, refer to Function 95.

Depending on the installed environment, correction of the room temperature sensor may be re­quired. Select the appropriate control setting according to the installed environment.

The temperature correction values show the difference from the Standard setting "00" (manufac­turer’s recommended value).

*When Function 95-01 (High insulation) is set, the Standard setting "00" will be the same as "No
correction 0.0 °F (0.0 °C)" (01).

Function number Setting value Setting description

Factory

setting

30

(For cooling)

31

(For heating)

00 Standard setting* ♦
01 No correction 0.0 °F (0.0 °C)
02 -1 °F (-0.5 °C)

More cooling
Less heating

03 -2 °F (-1.0 °C)
04 -3 °F (-1.5 °C)
05 -4 °F (-2.0 °C)
06 -5 °F (-2.5 °C)
07 -6 °F (-3.0 °C)
08 -7 °F (-3.5 °C)
09 -8 °F (-4.0 °C)
10 +1 °F (+0.5 °C)

Less cooling

More heating

11 +2 °F (+1.0 °C)
12 +3 °F (+1.5 °C)
13 +4 °F (+2.0 °C)
14 +5 °F (+2.5 °C)
15 +6 °F (+3.0 °C)
16 +7 °F (+3.5 °C)
17 +8 °F (+4.0 °C)

3) Auto restart

Enables or disables automatic restart after a power interruption.

Function number Setting value Setting description Factory setting

40

00 Enable ♦
01 Disable

NOTE:

Auto restart is an emergency function such as for power outage etc. Do not attempt to
use this function in normal operation. Be sure to operate the unit by remote controller or
external device.

4) Room temperature sensor switching

(Only for wired remote controller)
When using the wired remote controller temperature sensor, change the setting to "Both" (01).

Function number Setting value Setting description Factory setting

42

00 Indoor unit ♦
01 Both

00: Sensor on the indoor unit is active.
01: Sensors on both indoor unit and wired remote controller are active.

NOTE: Remote controller sensor must be turned on by using the remote controller.

- 25 -

WALL MOUNTED

ASU18, 24RLF

5) Remote controller custom code

(Only for wireless remote controller)
The indoor unit custom code can be changed. Select the appropriate custom code.

Function number Setting value Setting description Factory setting

44

00 A ♦
01 B
02 C
03 D

6) External input control

"Operation/Stop" mode or "Forced stop" mode can be selected.

Function number Setting value Setting description Factory setting

46

00 Operation/Stop mode ♦
01 (Setting prohibited)
02 Forced stop mode

7) Room temperature sensor switching (Aux.)

To use the temperature sensor on the wired remote controller only, change the setting to "Wired
remote controller" (01).

This function will only work if the function setting 42 is set at "Both" (01).
When the setting value is set to "Both" (00), more suitable control of the room temperature is pos-

sible by setting function setting 30 and 31 too.

Function number Setting value Setting description Factory setting

48

00 Both ♦
01 Wired remote controller

- 26 -

WALL MOUNTED

ASU18, 24RLF

8) Room temperature control for wired remote controller sensor

NOTE: Before performing this setting, refer to Function 95.

Depending on the installed environment, correction of the room temperature sensor may be re­quired. Select the appropriate control setting according to the installed environment.

To change this setting, set Function 42 to "Both" (01).
Ensure that the thermo sensor icon is displayed on the remote controller screen.

Function number Setting value Setting description

Factory

setting

92

(For cooling)

93

(For heating)

00 No correction 0.0 °F (0.0 °C) ♦
01 No correction 0.0 °F (0.0 °C)
02 -1 °F (-0.5 °C)

More cooling
Less heating

03 -2 °F (-1.0 °C)
04 -3 °F (-1.5 °C)
05 -4 °F (-2.0 °C)
06 -5 °F (-2.5 °C)
07 -6 °F (-3.0 °C)
08 -7 °F (-3.5 °C)
09 -8 °F (-4.0 °C)
10 +1 °F (+0.5 °C)

Less cooling

More heating

11 +2 °F (+1.0 °C)
12 +3 °F (+1.5 °C)
13 +4 °F (+2.0 °C)
14 +5 °F (+2.5 °C)
15 +6 °F (+3.0 °C)
16 +7 °F (+3.5 °C)
17 +8 °F (+4.0 °C)

9) Fixed operation mode switching

Sets the operation mode to heat pump, heating only, or cooling only.

Function number Setting value Setting description Factory setting

94

00 Heat pump ♦
01 Heating only
02 Cooling only

10) Heat insulation condition (building insulation)

Heat insulation conditions differ according to the installed environment.
"Standard insulation" (00) allows system to rapidly respond to the cooling or heating load

changes.
"High insulation" (01) is when the heat insulation structure of the building is high and does not re-

quire system to rapidly respond to cooling or heating load changes.
When "High insulation" (01) is selected:

• Overheating (overcooling) is prevented at the start-up.

• All room-temperature control settings (Function 30, 31, 92, and 93) will reset to "No correction

0.0 °F (0.0 °C)".

Function number Setting value Setting description Factory setting

95

00 Standard insulation ♦
01 High insulation

NOTE:

When changing Function 95, perform this setting before other room-temperature control
settings (Function 30, 31, 92, and 93). If Function 95 is not set first, room-temperature
control settings (Function 30, 31, 92, and 93) will be reset and you must re-do them
again.

- 27 -

WALL MOUNTED

ASU18, 24RLF

¢

Custom code setting for wireless remote controller

To interconnect the air conditioner and the wireless remote controller, assignment of the custom
code for the wireless remote controller is required.

NOTE:

Air conditioner cannot receive a custom code if the air conditioner has not been set for
the custom code.

1. Press the START/STOP button until only the clock is displayed on the remote controller dis­play.

2. Press the MODE button for at least 5 seconds to display the current custom code. (Initially
set to

.)

3.

Press the SET TEMP. (

or ) button to change the custom code between → → → .

Match the code on the display to the air conditioner custom code.

4. Press the MODE button again to return to the clock indicator. The custom code will be
changed.

NOTES:

• If no button is pressed within 30 seconds after the custom code is displayed, the system re­turns to the original clock indicator. In this case, start again from step 1.

• The air conditioner custom code is set to prior to shipment. To change the custom code,
contact your retailer.

• The remote controller resets to custom code when the batteries in the remote controller are
replaced. If you use a custom code other than code , reset the appropriate custom code af-

ter replacing the batteries. If you do not know the assigned code for the air conditioner, try
each of the custom code ( → → → ) until you find the code which operates the air condi-

tioner.

- 28 -

WALL MOUNTED

ASU18, 24RLF

11. Accessories

Part name Exterior Q’ty Part name Exterior Q’ty

Operating manual 1 Drain hose insulation 1

Installation manual 1 Cloth tape 1

Wall hook bracket 1

Tapping screw (large),
M4 × 25 mm

8

Remote controller 1

Tapping screw (small),
M3 × 12 mm

2

Battery 2 Air cleaning filter 2

Remote controller
holder

1 Air cleaning filter frame 2

- 29 -

WALL MOUNTED

ASU18, 24RLF

12. Optional parts

12-1. Controllers

Exterior Part name Model name Summary

Mode

Menu

Cool

Monitor

Set temp.

Fan

High

°

F

80

Mo

10:00

AM

Icon check:

Wired remote

controller

UTY-RVNUM

Large and full-dot liquid crystal
screen, wide and large keys easy to
press, user-intuitive arrow key.
Wire type: Polar 3-wire

Wired remote

controller

UTY-RNNUM

Room temperature can be controlled
by detecting the temperature
accurately with built-in thermo
sensor.
Wire type: Polar 3-wire

Simple remote

controller

UTY-RSNUM

Compact remote controller
concentrates on the basic functions
such as Start/Stop, fan control,
temperature setting, and operation
mode.
Wire type: Polar 3-wire

NOTE:

Available functions may differ by the remote controller. For details, refer to the operation
manual.

12-2. Others

Exterior Part name Model name Summary

External

connect kit

UTY-XWZX

Use to connect with various
peripheral devices and air conditioner
PCB.

- 30 -

WALL MOUNTED

ASU18, 24RLF

Part 2. OUTDOOR UNIT

SINGLE TYPE:
AOU18RLXFWH
AOU24RLXFWH

1. Specifications

Type Inverter heat pump

Model name AOU18RLXFWH AOU24RLXFWH

Power supply 208/230 V ~ 60 Hz
Available voltage range 187—253 V
Starting current A 8.0 10.5

Fan

Airflow rate

Cooling

CFM (m3/h)

1,489 (2,530) 2,001 (3,400)

Heating 1,489 (2,530) 2,119 (3,600)
Type × Q'ty Propeller fan × 1
Motor output W 100

Sound pressure level *1

Cooling

dB (A)

47 54

Heating 50 55

Heat exchanger type

Dimensions

(H × W × D)

in 31-7/16 × 35-7/16 × 1-7/16

mm 798 × 900 × 36.4
Fin pitch FPI 20
Rows × Stages 2 × 38
Pipe type Copper

Fin type

Type (Material) Corrugate (Aluminum)
Surface treatment Corrosion resistance (Blue fin)

Compressor

Type × Q'ty Hermetic motor compressor × 1
Motor output W 2,100

Refrigerant

Type R410A

Charge

lb oz 4 lb 10.1 oz

g 2,100

Refrigerant oil

Type POE (RB68)
Amount

in3 (cm3)

48.8 (800)

Enclosure

Material Steel sheet

Color

Beige

Approximate color of MUNSELL 10YR7.5/1.0

Dimensions
(H × W × D)

Net

in 32-11/16 × 35-7/16 × 13

mm 830 × 900 × 330

Gross

in 39-3/8 × 41-5/16 × 17-1/2

mm 1,000 × 1,050 × 445

Weight

Net

lb (kg)

135 (61)

Gross 152 (69)

Connection pipe

Size

Liquid

in (mm)

Ø 3/8 (Ø 9.52)

Gas Ø 5/8 (Ø 15.88)

Method Flare
Pre-charge length

ft (m)

66 (20)
Max. length 164 (50)
Max. height difference 98 (30)

Operation range

Cooling

°F (°C)

-5 to 115 (-20 to 46)

Heating -15 to 75 (-26 to 24)

Drain hose

Material LDPE
Size mm Ø 13.0 (I. D.), Ø 16.0 to Ø 16.7 (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.

- 32 -

OUTDOOR UNIT

AOU18, 24RLXFWH

2. Dimensions

2-1. Models: AOU18RLXFWH and AOU24RLXFWH

Unit: in (mm)

Top view

Front view

Side view

Bottom view

3(77)

35-3/8 (900)

32-3/4 (830)

17-3/8 (440)

7/8 (21)

15-3/4 (400)

13 (330)

7-3/4 (196)

5-3/4 (147)

6-3/4 (170)

14-5/8 (370)

25-5/8 (650)

Airflow

1-1/4
(31)

1/2
(12)

3-7/8

(99)

3/8

(9)

- 33 -

OUTDOOR UNIT

AOU18, 24RLXFWH

3. Installation space

3-1. Models: AOU18RLXFWH and AOU24RLXFWH

¢

Space requirement

Provide sufficient installation space for product safety.

 Single outdoor unit installation

• When the upper space is open:

Unit: in (mm)

When there are obstacles at the rear only. When there are obstacles at the rear and

sides.

4 (100) or more

10 (250)
or more

12 (300)
or more

4 (100)
or more

When there are obstacles at the front only. When there are obstacles at the front and

rear.

24 (600)
or more

24 (600)
or more

4 (100)
or more

• When there is an obstruction in the upper space:

Unit: in (mm)

When there are obstacles at the rear
and above.

When there are obstacles at the rear, sides,
and above.

12 (300)
or more

Max. 19
(500)

24 (600)
or more

40 (1,000)
or more

4 (100)
or more

10 (250)
or more

20 (500)
or more

Max. 19
(500)

- 34 -

OUTDOOR UNIT

AOU18, 24RLXFWH

 Multiple outdoor unit installation

• When the upper space is open:

Unit: in (mm)

When there are obstacles at the rear only. When there are obstacles at the front only.

12 (300)

10 (250)
or more

or more

60 (1,500)
or more

10 (250) or more

When there are obstacles at the front and
rear.

20 (500)
or more

60 (1,500)
or more

10 (250) or more

• When there is an obstruction in the upper space:

Unit: in (mm)

When there are obstacles at the rear and above.

60 (1,500) or more

20 (500) or more

10 (250)
or more

10 (250)
or more

Max. 11
(300)

60 (1,500)
or more

- 35 -

OUTDOOR UNIT

AOU18, 24RLXFWH

 Outdoor unit installation in multi-row

Unit: in (mm)

Single parallel unit arrangement Multiple parallel unit arrangement

6 (150) or more

24 (600) or more

40 (1,000) or more

79 (2,000) or more

20 (500) or more

24 (600) or more

60 (1,500) or more

10 (250) or more

119 (3,000) or more

10 (250) or more

60 (1,500) or more

20 (500) or more

10 (250) or more

NOTES:

• If the space is larger than stated above, the condition will be the same as when there is no
obstacle.

• Height above the floor level should be 2 in (50 mm) or more.

• When installing the outdoor unit, be sure to open the front and left side to obtain better opera­tion efficiency.

CAUTION

• Do not install the outdoor unit in two-stage where the drain water could freeze. Otherwise the
drainage from the upper unit may form ice and cause a malfunction of the lower unit.

• When the outdoor temperature is 32 °F (0 °C) or less, do not use the accessory drain pipe
and drain cap. If the drain pipe and drain cap are used, the drain water in the pipe may
freeze in extremely cold climate. (For reverse cycle model only.)

• In area with heavy snowfall, if the inlet and outlet of the outdoor unit is blocked with snow, it
might become difficult to get warm, and it is likely to cause product malfunction. Construct a
canopy and a pedestal, or place the unit on a high stand that is locally installed.

- 36 -

OUTDOOR UNIT

AOU18, 24RLXFWH

4. Refrigerant circuit

4-1. Models: AOU18RLXFWH and AOU24RLXFWH

3-way valve

(small)

3-way valve

(large)

Muffler

Pressure
switch

4-way valve

Strainer

Expansion valve

Strainer

Heat exchanger

(INDOOR)

Heat exchanger

(OUTDOOR)

Sub-accumulator

Compressor

Cooling
Heating

- 37 -

OUTDOOR UNIT

AOU18, 24RLXFWH

5. Wiring diagrams

5-1. Model: AOU18RLXFWH

- 38 -

OUTDOOR UNIT

AOU18, 24RLXFWH

5-2. Model: AOU24RLXFWH

- 39 -

OUTDOOR UNIT

AOU18, 24RLXFWH

6. Capacity compensation rate for pipe length and height
difference

Height difference H

Indoor unit is higher than outdoor unit

*

1

Indoor unit is lower than outdoor unit *

2

Indoor unit

Indoor unit

Connection pipe

Outdoor unit

Outdoor unit

Connection pipe

HH

6-1. Models: AOU18RLXFWH and AOU24RLXFWH

NOTE: Values mentioned in the table are calculated based on the maximum capacity.

COOLING

Pipe length

m

5 7.5 10 20 30 40 50

ft 16 24 32 65 98 131 164

Height difference H

Indoor unit is higher than

outdoor unit *1

30 98 - - - - 0.932 0.929 0.924
20 65 - - - 0.945 0.947 0.945 0.940
10 32 - - 0.984 0.961 0.963 0.960 0.956

7.5 24 - 0.988 0.988 0.965 0.967 0.964 0.959
5 16 0.992 0.992 0.992 0.968 0.971 0.968 0.963
0 0 0.998 1.000 1.000 0.976 0.979 0.976 0.971

Indoor unit is lower than outdoor

unit *2

-5 -16 0.998 1.000 1.000 0.976 0.979 0.976 0.971

-7.5 -24 - 1.000 1.000 0.976 0.979 0.976 0.971

-10 -32 - - 1.000 0.976 0.979 0.976 0.971

-20 -65 - - - 0.976 0.979 0.976 0.971

-30 -98 - - - - 0.979 0.976 0.971

HEATING

Pipe length

m

5 7.5 10 20 30 40 50

ft 16 24 32 65 98 131 164

Height difference H

Indoor unit is higher than

outdoor unit *1

30 98 - - - - 0.816 0.756 0.686
20 65 - - - 0.872 0.816 0.756 0.686
10 32 - - 0.991 0.872 0.816 0.756 0.686

7.5 24 - 1.000 0.991 0.872 0.816 0.756 0.686
5 16 0.986 1.000 0.991 0.872 0.816 0.756 0.686
0 0 0.986 1.000 0.991 0.872 0.816 0.756 0.686

Indoor unit is lower than outdoor

unit *2

-5 -16 0.981 0.995 0.986 0.868 0.812 0.752 0.683

-7.5 -24 - 0.993 0.983 0.866 0.810 0.750 0.681

-10 -32 - - 0.981 0.864 0.808 0.748 0.679

-20 -65 - - - 0.855 0.799 0.740 0.672

-30 -98 - - - - 0.791 0.733 0.665

- 40 -

OUTDOOR UNIT

AOU18, 24RLXFWH

7. Additional charge calculation

7-1. Models: AOU18RLXFWH and AOU24RLXFWH

Refrigerant type R410A

Refrigerant amount

lb oz 4 lb 10.1 oz

g 2,100

¢ Refrigerant charge

Total pipe length

ft 66 or less 98 131 164 (Max.)

0.43 oz/ft
(40 g/m)

m 20 or less 30 40 50 (Max.)

Additional charge

oz 0 14.1 28.2 42.3

g 0 400 800 1,200

- 41 -

OUTDOOR UNIT

AOU18, 24RLXFWH

8. Airflow

8-1. Model: AOU18RLXFWH

 Cooling

m3/h

2,530

l/s 703

CFM 1,489

 Heating

m3/h

2,530

l/s 703

CFM 1,489

8-2. Model: AOU24RLXFWH

 Cooling

m3/h

3,400

l/s 944

CFM 2,001

 Heating

m3/h

3,600

l/s 1,000

CFM 2,119

- 42 -

OUTDOOR UNIT

AOU18, 24RLXFWH

9. Operation noise (sound pressure)

9-1. Noise level curve

¢

Model: AOU18RLXFWH

 Cooling

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

NC-65

NC-60

NC-55

NC-50

NC-45

NC-40

NC-35

NC-30

NC-25

NC-20

NC-15

 Heating

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

NC-65

NC-60

NC-55

NC-50

NC-45

NC-40

NC-35

NC-30

NC-25

NC-20

NC-15

¢

Model: AOU24RLXFWH

 Cooling

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

NC-65

NC-60

NC-55

NC-50

NC-45

NC-40

NC-35

NC-30

NC-25

NC-20

NC-15

 Heating

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

NC-65

NC-60

NC-55

NC-50

NC-45

NC-40

NC-35

NC-30

NC-25

NC-20

NC-15

- 43 -

OUTDOOR UNIT

AOU18, 24RLXFWH

9-2. Sound level check point

39-3/8 in (1 m)

MicrophoneMicrophone

Rear

A

irflow

Rear view

Side view

NOTE: Detailed shape of the actual outdoor unit might be slightly different from the one illustrat-

ed above.

- 44 -

OUTDOOR UNIT

AOU18, 24RLXFWH

10. Electrical characteristics

Model name AOU18RLXFWH AOU24RLXFWH

Power supply

Voltage V 208/230~

Frequency Hz 60
MCA *1 A 17.0 18.0
Starting current A 7.8 8.6

Wiring spec.
*2

MAX. CKT. BKR *3 A 20

Power cable AWG 12

Connection cable *4 AWG 14

Limited wiring length ft (m) 167 (51)

*1: Minimum Circuit Ampacity (Calculation based on UL1995)
*2: Selected sample based on Japan Electrotechnical Standards and Codes Committee E0005.

As the regulations of wire size and circuit breaker differ in each country or region, select appropri­ate devices complied to the regional standard.

*3: Maximum Circuit Breaker
*4: Limit voltage drop to less than 2%. If voltage drop is 2% or more, increase cable conductor

size.

- 45 -

OUTDOOR UNIT

AOU18, 24RLXFWH

11. Safety devices

Type of

protection

Protection form

Model

AOU18RLXFWH AOU24RLXFWH

Circuit protection

Current fuse (Filter PCB) 250 V, 5 A × 2

Current fuse (Main PCB)

250 V, 3.15 A

250 V, 5 A

Current fuse (Out of PCB) 250 V, 5 A

Fan motor
protection

Thermal protection

Activate

302±27 °F (150±15 °C)

Fan motor stop

Reset

248±27 °F (120±15 °C)

Fan motor restart

Compressor
protection

Terminal protection
program
(Compressor temp.)

Activate

226 °F (108 °C)

Compressor stop

Reset

176 °F (80 °C)

Compressor restart

Thermal protection
program
(Discharge temp.)

(COOL or DRY mode)

Activate

230 °F (110 °C)

Compressor stop

Reset

After 7 minutes

Compressor restart

High pressure
protection

Pressure switch

Activate

4.2±0.1 MPa

Compressor stop

Reset

3.2±0.15 MPa

Compressor restart

- 46 -

OUTDOOR UNIT

AOU18, 24RLXFWH

12. Accessories

Part name Exterior Q’ty Part name Exterior Q’ty

Installation manual 1

Adapter,

12.7 (1/2)→15.88 (5/8)
[mm (in)]
(Only for 18 model)

1

Drain pipe 1

Adapter,

6.35 (1/4)→9.52 (3/8)
[mm (in)]

1

Drain cap 5

- 47 -

OUTDOOR UNIT

AOU18, 24RLXFWH