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4. SYSTEM CONFIGURATION

4.1. System conﬁ guration

Always keep to the limit on the total amount of refrigerant. Exceeding the limit on the

total amount of refrigerant when charging will lead to malfunction.

• Between outdoor unit and the farthest indoor unit

a + f ≤ 120 m, a + p ≤ 120 m

• Between the ﬁ rst separation tube and the farthest indoor unit

f ≤ 40 m, p ≤ 40 m

• Between the nearest indoor unit and the outdoor unit

a + b + h ≥ 5 m, a+c+q ≥ 5 m

• Between outdoor unit and the ﬁ rst separation tube

a ≥ 3 m

• Difference in height between outdoor units and indoor units (H1*)

50 m or less: Outdoor unit is higher than indoor unit

40 m or less: Outdoor unit is lower than indoor unit

• Difference in height between indoor units and indoor units

H2 ≤ 15 m, H3 ≤ 15 m

• Maximum total equivalent pipe length

a + f + h + j + l + n + p + q + s + u ≤ 180 m

• Total refrigerant amount ≤ 15.7 kg

Fig. A

Indoor

unit

Indoor

unit

4.2. Pipe selection

This unit is designed speciﬁ cally for use with the R410A refrigerant.

Pipes for R407C or R22 may not be used with this unit.

Do not use existing pipes.

Improper pipe selection will degrade performance.

First separation

tube (optional)

Indoor

unit

Table. A (Wall thickness and pipe material for each diameter)

6.35

Outside Diameter

(in)

(1/4)

0.8

Wall Thickness

(in)

(0.032)

Material

COPPER

Please select the pipe size in accordance with local rules.

*1: Allowable tensile stress ≥ 33 N/mm

*2: Endurance pressure of the pipes 4.2 MPa

En-5

CAUTION

Outdoor

unit

Indoor

unit

Indoor

unit

Indoor

unit

CAUTION

Pipe size

(table B)

Separation tube

(optional)

Pipe size

(table C)

Pipe size

(table D)

Indoor

unit

9.52

12.70

15.88

(3/8)

(1/2)

(5/8)

0.8

1.0

(0.032)

(0.039)

JIS H3300 C1220T-O or equivalent

Table. B (Diameter of piping used between outdoor unit and ﬁ rst separation

tubes or headers)

MODEL

AJ*040LBLAH

AJ*045LBLAH

AJ*054LBLAH

*3: Pipe Length: "a + f" or "a + p" of "4.1. SYSTEM CONFIGURATION"

Table. C (Diameter of piping used between separation tubes)

Total cooling

capacity of indoor

unit [kW]

4.4 to 11.1

11.2 to 20.1

*4: For the installation method, please refer to the installation manuals for indoor unit,

separation tubes or headers.

If pipe diameter Table C > Table B , select pipe size from Table B.

"Total cooling capacity of indoor unit" is the total value for the cooling capacity of indoor

unit connected downstream.

Use a standard separation tube for pipe branching. Do not use a T tube as it does not

separate the refrigerant evenly.

Table. D (Diameter of piping used between separation tube and indoor unit)

Model code of

indoor unit

07 to 14

H1*

18 to 30

36 to 54 *5

*5: If pipe diameter Table D > Table C , using of pipe size from Table C is preferable.

(Use reducer to change the diameter of connection pipe.)

Table. E (Indoor unit capacity comparison table - The indication of power is

different depending on the model.)

Model code of

indoor unit

Capacity [kW]

In the case of ARXB07LALH: equivalent to model code of indoor unit

4.3. Protection of pipes

Location

1 month or more

Outdoor

Less than 1 month

Indoor

• Protect the pipes to prevent the entry of moisture and dust.

• Especially pay attention when passing the pipes through a hole or connecting the end of

a pipe to the outdoor unit.

19.05

(3/4)

1.2

(0.047)

Diameter of piping [mm (in.)]

Outdoor

Between outdoor unit

unit cool-

and the farthest indoor

ing capac-

unit < 90m *3

ity [kW]

Liquid pipe

Gas pipe

12.1

9.52 (3/8)

15.88 (5/8)

14.0

9.52 (3/8)

15.88 (5/8)

15.5

9.52 (3/8)

19.05 (3/4)

Outside diameter [mm(in.)]

Liquid pipe

Gas pipe

9.52 (3/8)

15.88 (5/8)

9.52 (3/8)

19.05 (3/4)

Outside diameter [mm(in.)]

Liquid pipe

6.35 (1/4)

9.52 (3/8)

1.1

2.2

2.8

3.6

4.5

5.6

Model code 07 → Capacity=2.2kW

Working period

Pinch pipes

Pinch or tape pipes

—

Pinch or tape pipes

Between outdoor unit

and the farthest indoor

unit ≥ 90m *3

Liquid pipe

Gas pipe

9.52 (3/8)

19.05 (3/4)

9.52 (3/8)

19.05 (3/4)

9.52 (3/8)

19.05 (3/4)

Separation

Header *4

tube *4

UTR-H0906L

UTP-AX054A

UTR-H0908L

Gas pipe

12.70 (1/2)

15.88 (5/8)

19.05 (3/4)

7.1

9.0

11.2 12.5 14.0

Protection method