System Configuration; Pipe Selection; Protection Of Pipes - Fujitsu Airstage AOU72RLAVL Installation Manual

4. SYSTEM CONFIGURATION

For detailed information, refer to the Design and Technical Manual.
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 ≤ 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
a
f
b
j
h
Indoor Indoor
c
unit unit
p
s
q
Indoor
unit

4.2. Pipe selection

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)
Pipe size
(table B)
Indoor Indoor
unit unit
Table. A (Wall thickness and pipe material for each diameter)
Outside in 1/4 3/8
Diameter (mm)
(6.35) (9.52)
Wall Thick- in 0.032 0.032
ness (*3) (mm)
(0.8) (0.8)
COPPER *1
Material
JIS H3300 C1220T-O 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)
CAUTION
Outdoor unit
l n
Indoor Indoor Indoor
unit unit unit
u
H2
Indoor Indoor
unit unit
Indoor
H3
unit
CAUTION
Separation
tube (optional)
Indoor Indoor Indoor Indoor
unit unit unit unit
1/2 5/8 3/4 7/8
(12.70) (15.88) (19.05) (22.22)
0.032 0.039 0.047 0.039
(0.8) (1.0) (1.2) (1.0)
COPPER *2
JIS H3300 C1220T-H
or equivalent
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.
Outdoor
unit
Model cooling
capacity
[Btu/h]
AOU72
72,000
RLAVL
AOU96
96,000
RLAVL
AOU120
120,000
RLAVL
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]
x < 36,000
36,000 ≤ x < 48,000
48,000 ≤ x < 66,000
66,000 ≤ x < 96,500
96,500 ≤ x
*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)
H1
4,000 / 7,500 / 9,500
12,000 / 14,000 / 18,000
24,000 / 30,000 / 34,000 / 36,000 /
48,000 / 60,000
72,000
96,000
*5: Between separation tube and Indoor unit > 66 ft (20 m) → 1/2 in (12.70 mm).

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.
Pipe size
(table C)
Pipe size
(table D)
1-1/8
(28.58)
0.039
(1.0)
Diameter of piping [in (mm)]
Liquid pipe
Stan- Condi- Condi- Stan-
dard tion 1 tion 2 dard
3/8 1/2 3/4
←
(9.52) (12.70) (19.05)
3/8 1/2 7/8
←
(9.52) (12.70) (22.22)
1/2 1-1/8
← ←
(12.70) (28.58)
Outside diameter [mm (in)]
Separation
tube *4
Liquid pipe Gas pipe
3/8 (9.52) 5/8 (15.88)
3/8 (9.52) 3/4 (19.05)
UTP-AX090A
1/2 (12.70) 3/4 (19.05)
1/2 (12.70) 7/8 (22.22)
1/2 (12.70) 1-1/8 (28.58) UTP-AX180A
Outside diameter [mm (in)]
Liquid pipe
1/4 (6.35)
1/4 (6.35)
3/8 (9.52)
3/8 (9.52)
3/8 (9.52)
Working period Protection method
Pinch pipes
Pinch or tape pipes
— Pinch or tape pipes
Gas pipe
Condi- Condi-
tion 1 tion 2
7/8
←
(22.22)
← ←
← ←
Header *4
UTR-H0906L
UTR-H0908L
UTR-H1806L
UTR-H1808L
Gas pipe
3/8 (9.52) (*5)
1/2 (12.70)
5/8 (15.88)
3/4 (19.05)
7/8 (22.22)
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