En-6
4. SYSTEM CONFIGURATION
For detailed information, refer to the Design and Technical Manual.
4.1. System confi guration
CAUTION
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 ≤ 393 ft (120 m), a + p ≤ 393 ft (120 m)
• Between the first separation tube and the farthest indoor unit
f ≤ 295 ft (90 m), p ≤ 295 ft (90 m)
• (The farthest indoor unit to the first separation tube) - (The nearest indoor unit to the first
separation tube)
f - (b + h) ≤ 196 ft (60 m), p - (c + q) ≤ 196 ft (60 m)
• Between the nearest indoor unit and the outdoor unit
a + b + h ≥ 17 ft (5 m), a + c + q ≥ 17 ft (5 m)
• Between outdoor unit and the first separation tube
a ≥ 10 ft (3 m)
• Difference in height between outdoor units and indoor units (H1)
164 ft (50 m) or less: Outdoor unit is higher than indoor unit
131 ft (40 m) or less: Outdoor unit is lower than indoor unit
• Difference in height between indoor units and indoor units (H2, H3)
(Indoor unit "A****TLAV1") 164 ft (50 m) or less: Outdoor unit is higher than indoor unit
(Indoor unit "A****TLAV1") 131 ft (40 m) or less: Outdoor unit is lower than indoor unit
(Other indoor units) 49 ft (15 m) or less
• Maximum total equivalent pipe length
a + f + h + j + l + n + p + q + s + u ≤ 1312 ft (400 m)
• Total refrigerant amount
72/96 model: ≤ 44.09 lbs (20.0 kg)
120 model: ≤ 56.44 lbs (25.6 kg)
Fig. A
f
p
q
j
h
b
c
s
u
H3
l
n
H1
H2
a
Outdoor unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
4.2. Pipe selection
CAUTION
This unit is designed specifically 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)
Separation
tube (optional)
Pipe size
(table B)
Pipe size
(table C)
Pipe size
(table D)
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Table. A
(Wall thickness and pipe material for each diameter)
Outside
Diameter
in
(mm)
1/4
(6.35)
3/8
(9.52)
1/2
(12.70)
5/8
(15.88)
3/4
(19.05)
7/8
(22.22)
1-1/8
(28.58)
Wall Thick-
ness (*3)
in
(mm)
0.032
(0.8)
0.032
(0.8)
0.032
(0.8)
0.039
(1.0)
0.047
(1.2)
0.039
(1.0)
0.039
(1.0)
Material
COPPER *1
JIS H3300 C1220T-O or equivalent
COPPER *2
JIS H3300 C1220T-H
or equivalent
Please select the pipe size in accordance with local rules.
*1: Allowable tensile stress ≥ 33 (N/mm²)
*2: Allowable tensile stress ≥ 61 (N/mm²)
*3: Endurance pressure of the pipes 609 psi (4.2 MPa)
Table. B (Diameter of piping used between outdoor unit and first separation
tube or header)
For the following installation conditions, it is necessary to increase the piping size.
• Condition 1: Total indoor unit capacity ratio ˃ 110%
• Condition 2: Between outdoor unit and first separation tube or header ˃ 230 ft (70 m)
If both conditions 1 and 2 are met, condition 2 is followed.
Model
Outdoor
unit
cooling
capacity
[Btu/h]
Diameter of piping [in (mm)]
Liquid pipe
Gas pipe
Stan-
dard
Condi-
tion 1
Condi-
tion 2
Stan-
dard
Condi-
tion 1
Condi-
tion 2
AOU72
RLAVL
72,000
3/8
(9.52)
←
1/2
(12.70)
3/4
(19.05)
←
7/8
(22.22)
AOU96
RLAVL
96,000
3/8
(9.52)
1/2
(12.70)
←
7/8
(22.22)
←
←
AOU120
RLAVL
120,000
1/2
(12.70)
←
←
1-1/8
(28.58)
←
←
Table. C (Diameter of piping used between separation tubes)
(If pipe diameter C > B, select pipe size from table B)
Total cooling
capacity of indoor
unit [Btu/h]
Outside diameter [mm (in)]
Separation
tube *4
Header *4
Liquid pipe
Gas pipe
x < 36,000
3/8 (9.52)
5/8 (15.88)
UTP-AX090A
UTR-H0906L
UTR-H0908L
36,000 ≤ x < 48,000
3/8 (9.52)
3/4 (19.05)
48,000 ≤ x < 66,000
1/2 (12.70)
3/4 (19.05)
66,000 ≤ x < 96,500
1/2 (12.70)
7/8 (22.22)
96,500 ≤ x
1/2 (12.70)
1-1/8 (28.58)
UTP-AX180A
UTR-H1806L
UTR-H1808L
*4: For the installation method, please refer to the installation manuals for indoor unit,
separation tubes or headers.
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)
(If pipe diameter D > C, select pipe size from table C)
Cooling capacity of indoor unit
(Btu/h)
Outside diameter [mm (in)]
Liquid pipe
Gas pipe
4,000 / 7,500 / 9,500
1/4 (6.35)
3/8 (9.52) (*5)
12,000 / 14,000 / 18,000
1/4 (6.35)
1/2 (12.70)
24,000 / 30,000 / 34,000 / 36,000 /
48,000 / 60,000
3/8 (9.52)
5/8 (15.88)
72,000
3/8 (9.52)
3/4 (19.05)
96,000
3/8 (9.52)
7/8 (22.22)
*5: Between separation tube and Indoor unit > 66 ft (20 m) → 1/2 in (12.70 mm).
4.3. Protection of pipes
Location
Working period
Protection method
Outdoor
1 month or more
Pinch pipes
Less than 1 month
Pinch or tape pipes
Indoor
—
Pinch or tape pipes
• 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.
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9380545309-02.indb 6
2018/12/27 8:39:00
2018/12/27 8:39:00
