Pipe Selection - Fujitsu AIRSTAGE AJY126GALH Installation Manual

• Allowable pip length (actual pipe length)
Between master outdoor unit and the
farthest indoor unit
Between the fi rst separation tube and the
farthest indoor unit
Total pipe length
Between outdoor unit and outdoor unit
branch kit
• Allowable height difference
Between outdoor unit and indoor unit (When
indoor unit is installed below)
Between outdoor unit and indoor unit (When
outdoor unit is installed below)
Between indoor units
Between outdoor units
Between RB unit and indoor unit
Between RB units
• Total refrigerant amount : 70 kg or less
• Outdoor unit capacity : Master ≥ Slave
C) In the case of 3 outdoor units connected
O.U.-1 O.U.-2
H4
(Master)
(Slave1)
a
b
d
e
RB
RB
Fig. C
I.U. I.U.
H6
RB RB
I.U. I.U.
• Allowable pip length (actual pipe length)
Between master outdoor unit and the
farthest indoor unit
Between the fi rst separation tube and the
farthest indoor unit
Total pipe length
Between outdoor unit and outdoor unit
branch kit
Between the farthest outdoor unit and the
fi rst outdoor unit branch kit
• Allowable height difference
Between outdoor unit and indoor unit (When
indoor unit is installed below)
Between outdoor unit and indoor unit (When
outdoor unit is installed below)
Between indoor units
Between outdoor units
Between RB unit and indoor unit
Between RB units
• Total refrigerant amount : 105 kg or less
• Outdoor unit capacity : Master ≥ Slave 1 ≥ Slave 2
NOTE) • If the outdoor temperature during cooling operation is expected to be –5 °C
or less, do not install the outdoor unit lower than the indoor unit.
• Please refer to "8.3.2. Checking total amount of refrigerant and calculat-
ing the amount of refrigerant charge to be added" for the total amount of
refrigerant.
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.
En-7
165 m or less
60 m or less
1000 m or less
3 m or less
50 m or less
40 m or less
15 m or less
0.5 m or less
5 m or less
15 m or less
O.U.-3
(Slave2)
O.U. :Outdoor unit
RB :RB unit
I.U. :Indoor unit
c
(*1:Cooling only)
f
RB RB
H1
*1
I.U. I.U. I.U.
p
RB RB
H2
I.U.
H5
H3
I.U.
165 m or less
60 m or less
1000 m or less
3 m or less
12 m or less
50 m or less
40 m or less
15 m or less
0.5 m or less
5 m or less
15 m or less
CAUTION
a+e+f
a+e+p
f, p
Total
a, b
Separation tube (Optional)
Pipe size
H1
(table D)
H2, H3
H4
H5
(Wall thickness and pipe material for each diameter)
H6
Outside Diameter mm
Wall Thickness
Material
*1. Allowable tensile stress ≥ 33 (N/mm
*2. Allowable tensile stress ≥ 61 (N/mm
*3. Endurance pressure of the pipes 4.2MPa
Please select the pipe size in accordance with local rules.
Table. A (Between outdoor unit and outdoor unit branch kit)
Outdoor
HP unit cooling
capacity (kW)
8
22.4
10
28.0
12 33.5
14 40.0
16
45.0
*4. For the installation method, refer to "5.4. Multiple connections".
Table. B (Between outdoor unit branch kits or outdoor unit branch kit and
fi rst separation tube)
Total cooling
capacity of outdoor
a+e+f
unit (kW)
a+e+p
22.4
f, p
22.5 to 28.0
Total
28.1 to 33.5
33.6 to 45.0
a, b, c
45.1 to 56.0
b+d
56.1 to 78.5
c+d
78.6 to 96.0
96.1 to 102.4
102.5 or more
H1
Table. C (Between separation tubes or separation tube and RB unit)
Total cooling
H2, H3
capacity of indoor
H4
unit (kW)
H5
4.4 to 11.1
H6
11.2 to 13.9
14.0 to 22.3
22.4 to 28.0
28.1 to 44.7
44.8 to 46.9
47.0 to 56.0
56.1 to 80.0
80.1 to 95.0
95.1 or more
* 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 fi rst separation
tube (based on table "B"), please select the pipe whose diameter is equal to the one
between outdoor unit branch kit and the fi rst 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.
* Discharge gas pipe size selection : When indoor unit of cooling only type is connected,
it calculates with the value except capacity of cooling only type.
Master Slave Slave
unit unit1 unit2
Outdoor unit branch kit (Optional)
(single
RB RB RB (multi type)
type)
6.35 9.52 12.70 15.88
*3
mm 0.8 0.8 0.8 1.0
*1
COPPER
JIS H3300 C1220T-O or equiva-
lent
2
)
2
)
Outside diameter mm (in)
Discharge
Liquid pipe
Gas pipe
12.70 (1/2") 15.88 (5/8")
12.70 (1/2") 19.05 (3/4")
12.70 (1/2") 19.05 (3/4")
12.70 (1/2") 22.22 (7/8")
12.70 (1/2") 22.22 (7/8")
Outside diameter mm (in)
Discharge Gas
Liquid pipe
pipe
12.70 (1/2") 15.88 (5/8")
12.70 (1/2") 19.05 (3/4")
12.70 (1/2") 19.05 (3/4")
12.70 (1/2") 22.22 (7/8")
15.88 (5/8") 22.22 (7/8")
15.88 (5/8") 28.58 (1-1/8")
19.05 (3/4") 28.58 (1-1/8")
19.05 (3/4") 28.58 (1-1/8")
19.05 (3/4") 34.92 (1-3/8")
Outside diameter mm (in)
Discharge Gas
Liquid pipe
pipe
9.52 (3/8") 12.70 (1/2")
9.52 (3/8") 12.70 (1/2")
12.70 (1/2") 15.88 (5/8")
12.70 (1/2") 19.05 (3/4")
12.70 (1/2") 19.05 (3/4")
15.88 (5/8") 19.05 (3/4")
15.88 (5/8") 22.22 (7/8")
15.88 (5/8") 28.58 (1-1/8")
19.05 (3/4") 28.58 (1-1/8")
19.05 (3/4") 28.58 (1-1/8")
Pipe size (table A)
Pipe size (table B)
Pipe size (table C)
Pipe size (table E)
Pipe size (table F)
19.05 22.22 28.58 34.92 41.27
1.2 1.0 1.0 1.2 1.43
*2
COPPER
JIS H3300 C1220T-H or
equivalent
*4
Branch kit
Suction Gas
pipe
22.22 (7/8")
22.22 (7/8")
28.58 (1-1/8") UTP-DX567A
28.58 (1-1/8")
28.58 (1-1/8")
Suction Gas pipe
22.22 (7/8")
22.22 (7/8")
28.58 (1-1/8")
28.58 (1-1/8")
28.58 (1-1/8")
34.92 (1-3/8")
34.92 (1-3/8")
41.27 (1-5/8")
41.27 (1-5/8")
Separation
tube
Suction Gas
for 3 pipes
pipe
15.88 (5/8")
19.05 (3/4")
UTP-
BX090A
22.22 (7/8")
22.22 (7/8")
28.58 (1-1/8")
UTP-
28.58 (1-1/8")
BX180A
28.58 (1-1/8")
34.92 (1-3/8")
UTP-
34.92 (1-3/8")
BX567A
41.27 (1-5/8")