Protection Of Pipes; Pipe Installation; Brazing; Indoor Unit Pipe Connections - Fujitsu AIRSTAGE AJY126GALH Installation Manual

Table. D (Between separation tube and RB unit
Cooling capacity of
Model code
indoor unit (kW)
07, 09, 12, 14 2.2, 2.8, 3.6, 4.0, 4.5
18, 24, 30 5.6, 7.1, 8.0, 9.0
36, 45, 54 11.2, 12.5, 14.0
60 18.0
72, 90 22.4, 25.0
Use a standard separation tube for pipe branching. Do not use a T tube as it does not
separate the refrigerant evenly.
Table. E (Between separation tubes or RB unit and separation tube)
Outside diameter mm (in)
Total cooling capacity
of indoor unit (kW)
Liquid pipe
4.4 to 11.1 9.52 (3/8")
11.2 to 13.9 9.52 (3/8")
14.0 to 28.0 12.70 (1/2")
28.1 to 44.7 12.70 (1/2")
44.8 to 56.0 15.88 (5/8")
56.1 to 80.0 15.88 (5/8")
80.1 to 95.0 19.05 (3/4")
95.1 or more 19.05 (3/4")
* If the selected pipe diameter based on table "E" becomes larger than the pipe diameter
based on table "C", please select the pipe whose diameter is equal to the table "C".
Gas pipe of table "E" should be compared with suction gas pipe of table "C."
(If pipe diameter E > C, select pipe size from table C)
* "Total cooling capacity of indoor unit" is the total value for the cooling capacity of indoor
unit connected downstream.
Table. F (Between separation tube and indoor unit or RB unit and
Cooling capacity of
Model code
indoor unit (kW)
07, 09, 12, 14 2.2, 2.8, 3.6, 4.0, 4.5
18, 24, 30 5.6, 7.1, 8.0, 9.0
36, 45, 54 11.2, 12.5, 14.0
60 18.0
72, 90 22.4, 25.0
Table. G (Separation tube / Header)
• Separation tube
Total cooling capacity
of indoor unit (kW)
28.0 or less UTP-AX090A or UTR-BP090X
28.1 to 56.0 UTP-AX180A or UTR-BP180X
56.1 or more UTP-AX567A or UTR-BP567X
• Header
Total cooling
capacity of indoor for 2 pipes
unit (kW)
3-6 Branches
28.0 or less UTR-H0906L UTR-H0908L
28.1 to 56.0 UTR-H1806L UTR-H1808L
*5. For the installation method, refer to the section on "Indoor unit pipe connections"
below.
4. 3.

Protection of 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.
Location Working period
1 month or more
Outdoor
Less than 1 month
—
Indoor
)
Outside diameter mm (in)
Discharge Suction
Liquid pipe
Gas pipe Gas pipe
6.35 (1/4") 9.52 (3/8") 12.70 (1/2")
9.52 (3/8") 12.70 (1/2") 15.88 (5/8")
9.52 (3/8") 12.70 (1/2") 19.05 (3/4")
9.52 (3/8") 15.88 (5/8") 19.05 (3/4")
12.70 (1/2") 19.05 (3/4") 22.22 (7/8")
Separation tube
Gas pipe for 2 pipes
15.88 (5/8")
UTP-AX090A or
19.05 (3/4")
UTR-BP090X
22.22 (7/8")
28.58 (1-1/8")
UTP-AX180A or
UTR-BP180X
28.58 (1-1/8")
34.92 (1-3/8")
UTP-AX567A or
34.92 (1-3/8")
UTR-BP567X
41.27 (1-5/8")
indoor unit)
Outside diameter mm (in)
Liquid pipe Gas pipe
6.35 (1/4") 12.70 (1/2")
9.52 (3/8") 15.88 (5/8")
9.52 (3/8") 19.05 (3/4")
9.52 (3/8") 19.05 (3/4")
12.70 (1/2") 22.22 (7/8")
*5
Separation tube
for 2 pipes for 3 pipes
UTP-BX090A
UTP-BX180A
UTP-BX567A
*5
Header
for 3 pipes
3-8 Branches 3-6 Branches 3-8 Branches
UTP-J0906A UTP-J0908A
UTP-J1806A UTP-J1808A
Protection method
Pinch pipes
Pinch or tape pipes
Pinch or tape pipes
5.

PIPE INSTALLATION

5. 1.

Brazing

CAUTION
If air or different type of refrigerant enters
the refrigeration cycle, the internal pres-
sure in the refrigeration cycle will become
abnormally high and prevent the unit from
exerting its full performance.
Apply nitrogen gas while brazing the
pipes.
Nitrogen gas pressure: 0.02 MPa (= suf-
fi cient pressure to be felt on the back of
your hand or more)
If a pipe is brazed without applying nitrogen gas, it will create an oxidation fi lm.
This can degrade performance or damage the parts in the unit (such as the com-
pressor or valves).
Do not use fl ux to braze pipes. If the fl ux is the chlorine type, it will cause the pipes
to corrode.
In addition, if the fl ux contains fl uoride, it will affect the refrigerant piping system due to
deterioration of refrigerant oil.
For brazing material, use phosphor copper that does not require fl ux.
5. 2.

Indoor unit pipe connections

CAUTION
For details, refer to the Installation Instruction Sheet of each part.
Separation tube
B
Horizontal
A
Horizontal line
± 15°
GOOD
A : Outdoor unit or Refrigerant branch kit
B : Indoor unit or Refrigerant branch kit
PROHIBITED
Header
Gas pipe
Outdoor
C
unit side
Liquid pipe
Outdoor
D
unit side
GOOD
H = 0 to 10 mm
1
(α : 0° to 1°)
1
β : -10° to 10°
1
H = 0 to 10 mm
2
(α : 0° to 1°)
2
β : -10° to 10°
2
PROHIBITED
CAUTION
Do not connect a separation tube after a header.
Leave the distance 0.5 m or more for straight part to branch tube and
header.
Fig.
Pressure regulating valve
Cap
Nitrogen gas
Brazing area
A
B
Vertical
or
B
A
Horizontal line
1 Horizontal
line
VIEW C
1
H
1
Horizontal
Vertical
line
line
2
H
2
2
VIEW D
PROHIBITED
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