Fujitsu AOUA72ULBV5 - Pipe Selection (for Heat Recovery System)

En-11
5.2. Pipe selection (for Heat Recovery 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.
I.U. I.U.
O.U.
-3
O.U.
-2
O.U.
-1
I.U.
I.U.
I.U.
I.U.
I.U. I.U.
RB
RBRB
(Primary)
(Subordinate 1)
First separation tube (optional)
Separation tube
(optional)
Outdoor unit
branch kit
(optional)
(Single type)
(Multi type)
Pipe size
(table A)
Pipe size
(table B)
Pipe size
(table C)
Pipe size
(table D)
Pipe size
(table E)
Pipe size
(table F)
(Subordinate 2)
O.U. :Outdoor unit
RB: RB 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
Discharge
gas pipe
Suction gas
pipe
6 72,000
3/8 (9.52)
5/8 (15.88) 3/4 (19.05)
UTP-DX567A
8 96,000
3/4 (19.05)
7/8 (22.22)
10 120,000
1/2 (12.70)
1-1/8 (28.58)
12 144,000
7/8 (22.22)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
Discharge
gas pipe
Suction gas
pipe
6 72,000
1/2 (12.70)
5/8 (15.88)
7/8 (22.22)
UTP-DX567A
8 96,000
3/4 (19.05)
10 120,000
1-1/8 (28.58)
12 144,000
7/8 (22.22)14 168,000
5/8 (15.88)
16 192,000
Table. B (Between outdoor unit branch kits or outdoor unit branch kit and first
separation tube)
[Standard]
Ton
Total cooling capacity of
outdoor unit [Btu/h]
Outside diameter [in (mm)]
Liquid pipe
Discharge gas
pipe
Suction gas
pipe
6 72,000
3/8 (9.52)
5/8 (15.88) 3/4 (19.05)
8 96,000
3/4 (19.05)
7/8 (22.22)
10 120,000
1/2 (12.70)
1-1/8 (28.58)
12 144,000
7/8 (22.22)
14 168,000
5/8 (15.88)
16 184,000
18 216,000
1-1/8 (28.58)
1-3/8 (34.92)
20 240,000
22 264,000
24 288,000
3/4 (19.05)
26 312,000
28 336,000
1-5/8 (41.27)
30 360,000
1-3/8 (34.92)
32 384,000
34 408,000
36 432,000
[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
Total cooling capacity of
outdoor unit [Btu/h]
Outside diameter [in (mm)]
Liquid pipe
Discharge gas
pipe
Suction gas
pipe
6 72,000
1/2 (12.70)
5/8 (15.88)
7/8 (22.22)
8 96,000
3/4 (19.05)
10 120,000
1-1/8 (28.58)
12 144,000
7/8 (22.22)
14 168,000
5/8 (15.88)
16 184,000
18 216,000
1-1/8 (28.58)
1-3/8 (34.92)
20 240,000
22 264,000
24 288,000
3/4 (19.05)
26 312,000
28 336,000
1-5/8 (41.27)
30 360,000
1-3/8 (34.92)
32 384,000
34 408,000
36 432,000
Table. C (Between separation tubes or separation tube and RB unit)
* If the selected pipe diameter between separation tubes (based on table "C") becomes
larger than the pipe diameter between outdoor unit branch kit and the first separation
tube (based on table "B"), please select the pipe whose diameter is equal to the one
between outdoor unit branch kit and the first separation tube.
(If pipe diameter C > 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.
Total cooling capacity
of indoor unit [Btu/h]
Outside diameter [in (mm)]
Separation
tube (for 3
pipes)
Liquid pipe
Discharge
gas pipe
Suction gas
pipe
15,000 ≤ x < 36,000
3/8 (9.52) 1/2 (12.70)
5/8 (15.88)
UTP-BX090A
36,000 ≤ x < 48,000 3/4 (19.05)
48,000 ≤ x < 72,000
1/2 (12.70)
5/8 (15.88)
7/8 (22.22)
72,000 ≤ x < 96,500
3/4 (19.05)96,500 ≤ x < 153,000
1-1/8 (28.58) UTP-BX180A153,000 ≤ x < 161,000
5/8 (15.88)161,000 ≤ x < 193,000 7/8 (22.22)
193,000 ≤ x < 274,000
1-1/8 (28.58)
1-3/8 (34.92)
UTP-BX567A
274,000 ≤ x < 325,000
3/4 (19.05)
325,000 ≤ x 1-5/8 (41.27)
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