Fujitsu AOUA72ULBV5 - Pipe Selection (for Heat Pump System)

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4.1.2 In case of 2 outdoor units connected
O.U.-2
O.U.-1
f
e
a
g
q
H4
p
H1
H2
H3
b
I.U.
I.U.
I.U.
I.U.
I.U.
I.U.
I.U.
I.U. I.U.
(Subordinate)
(Primary)
O.U. :Outdoor unit
I.U. :Indoor unit
Allowable pipe length (actual pipe length)
Between primary outdoor unit and the farthest
indoor unit
541 ft (165 m) or less
a + e + f
a + e + p
Between the first separation tube and the
farthest indoor unit
295 ft (90 m) or less
f, p
(Farthest indoor unit) - (Closest indoor unit) 196 ft (60 m) or less
f(p) - g(q)
Total pipe length
3,280 ft (1,000 mm) or
less
Total
Between outdoor unit and outdoor unit branch
kit
9 ft (3 m) or less
a, b
Allowable height difference
Between outdoor unit and indoor unit (When
indoor unit is installed below)
164 ft (50 m) or less (*1)
H1
Between outdoor unit and indoor unit (When
outdoor unit is installed below)
131 ft (40 m) or less
Between indoor units 164 ft (50 m) or less
H2, H3
Between outdoor units 1 ft (0.5 m) or less
H4
• Outdoor unit capacity: Primary ≥ Subordinate
*1: For installations over 164 ft (50 m), refer to the Design & Technical manual.
4.1.3 In the case of 3 outdoor units connected
O.U.-3
O.U.-2
O.U.-1
f
e
c
b
a
g
q
H4
d
p
H1
H2
H3
(Subordinate 2)
(Subordinate 1)
(Primary)
O.U. :Outdoor unit
I.U. :Indoor unit
Allowable pipe length (actual pipe length)
Between primary outdoor unit and the
farthest indoor unit
541 ft (165 m) or less
a + e + f
a + e + p
Between the first separation tube and the
farthest indoor unit
295 ft (90 m) or less
f, p
(Farthest indoor unit) - (Closest indoor unit) 196 ft (60 m) or less
f(p) - g(q)
Total pipe length
3,280 ft (1,000 mm) or
less
Total
Between outdoor unit and outdoor unit branch
kit
9 ft (3 m) or less
a, b, c
Between the farthest outdoor unit and the first
outdoor unit branch kit
39 ft (12 m) or less
b + d
c + d
Allowable height difference
Between outdoor unit and indoor unit (When
indoor unit is installed below)
164 ft (50 m) or less (*1)
H1
Between outdoor unit and indoor unit (When
outdoor unit is installed below)
131 ft (40 m) or less
Between indoor units 164 ft (50 m) or less
H2, H3
Between outdoor units 1 ft (0.5 m) or less
H4
• Outdoor unit capacity: Primary ≥ Subordinate 1 ≥ Subordinate 2
*1: For installations over 164 ft (50 m), refer to the Design & Technical manual.
NOTE:
• If the outdoor temperature during cooling operation is expected to be 23°F (–5°C) or
less, outdoor unit must be installed lower than 16 ft (5 m) or less from the indoor unit.
• Please refer to “9.3.2 Checking total amount of refrigerant and calculating the amount
of refrigerant charge to be added” for the total amount of refrigerant.
4.2. Pipe selection (for Heat Pump system)
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.
O.U.
-3
O.U.
-2
O.U.
-1
I.U. I.U. I.U. I.U. I.U. I.U.
(Primary) (Subordinate 1)
First separation
tube (optional)
Outdoor unit
branch kit
(optional)
Separation tube
(optional)
Pipe size
(table A)
Pipe size
(table B)
Pipe size
(table C)
Pipe size
(table D)
(Subordinate 2)
O.U. :Outdoor unit
I.U. :Indoor unit
(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)
1-3/8
(34.92)
1-5/8
(41.27)
Wall thick-
ness (*1)
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)
0.047
(1.2)
0.056
(1.43)
Material
COPPER (
*2)
JIS H3300 C1220T-O or
equivalent
COPPER (
*3)
JIS H3300 C1220T-H or equivalent
*1: Endurance pressure of the pipes 609 psi (4.2MPa)
*2: Allowable tensile stress ≥ 33 (N/mm²)
*3: Allowable tensile stress ≥ 61 (N/mm²)
Please select the pipe size in accordance with local rules.
Table. A (Between outdoor unit and outdoor unit branch kit)
* For the branch kit installation method, refer to “6.4. Multiple connections”.
[Standard]
Ton
Nominal cooling
capacity of out-
door unit [Btu/h]
Outside diameter [in (mm)]
Branch kit
Liquid pipe Gas pipe
6 72,000
3/8 (9.52)
3/4 (19.05)
UTP-CX567A
8 96,000 7/8 (22.22)
10 120,000
1/2 (12.70)
1-1/8 (28.58)
12 144,000
14 168,000
5/8 (15.88)
16 192,000
[Condition 1]
When one or more of the following apply:
• The distance between the outdoor unit (primary) and the farthest indoor unit is 230 ft (70
m) or more.
• If the outdoor unit is lower than the indoor unit and the height difference exceeds 16 ft (5
m); only for liquid pipes.
Ton
Nominal cooling
capacity of out-
door unit [Btu/h]
Outside diameter [in (mm)]
Branch kit
Liquid pipe Gas pipe
6 72,000
1/2 (12.70)
7/8 (22.22)
UTP-CX567A
8 96,000
10 120,000
1-1/8 (28.58)
12 144,000
14 168,000
5/8 (15.88)
16 192,000
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