Protection Of Pipes; Pipe Installation; Brazing; Indoor Unit Pipe Connections - Fujitsu AIRSTAGE K00250LW Addendum

Table. F (Between separation tube and indoor unit or RB unit and indoor unit)
Indoor unit capacity
[Btu/h]
7,500 9,500
12,000 14,000
18,000 24000
30,000
36,000 48,000
60,000
Table. G (Separation tube / Header)
• Separation tube
Total cooling capacity
of indoor unit [Btu/h]
UTP-AX054A, UTP-AX090A or
x < 66,000
UTR-BP090X
66,000 ≤ x < 96,500 UTP-AX090A or UTR-BP090X
96,500 ≤ x < 193,000 UTP-AX180A or UTR-BP180X
193,000 ≤ x UTP-AX567A or UTR-BP567X
• Header
Total cooling
capacity of indoor for 2 pipes
unit [Btu/h]
3-6 Branches
x < 96,500 UTR-H0906L UTR-H0908L
96,500 ≤ x < 193,000 UTR-H1806L UTR-H1808L
*5. For the installation method, refer to the section on "Indoor unit pipe connections"
below.
Indoor unit model codes and model selection capacity
Model code 07
Indoor unit capacity
7,500
[Btu/h]
Model code 24
Indoor unit capacity
24,000
[Btu/h]
• Outdoor air unit
Connectable unit within 1 refrigerant system
Connectable cooling
Unit
capacity range
Only Outdoor air unit 50% to 100%
Outdoor air unit
50% to 100%
+ Indoor unit
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

5. PIPE INSTALLATION

5. 1.

Brazing

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: 2.9 psi (0.02 MPa)
(= suffi 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.
En-9
Outside diameter [in (mm)]
Liquid pipe Gas pipe
1/4 (6.35) 1/2 (12.70)
3/8 (9.52) 5/8 (15.88)
3/8 (9.52) 3/4 (19.05)
3/8 (9.52) 3/4 (19.05)
Separation tube *5
for 2 pipes for 3 pipes
UTP-BX090A
UTP-BX180A
UTP-BX567A
Header
*5
for 3 pipes
3-8 Branches 3-6 Branches 3-8 Branches
UTP-J0906A UTP-J0908A
UTP-J1806A UTP-J1808A
09 12 14
9,500 12,000 14,000
30 36 48
30,000 36,000 48,000
Remarks
-
The capacity of "Outdoor air
unit" should be less than 30%
of the outdoor unit capacity.
Protection method
Pinch pipes
Pinch or tape pipes
—
Pinch or tape pipes
CAUTION
Fig.
Pressure regulating valve
Cap
Nitrogen gas
Brazing area
5. 2.

Indoor unit pipe connections

For details, refer to the Installation Instruction Sheet of each part.
Separation tube
Horizontal
A
± 15°
A : Outdoor unit or Refrigerant branch kit
B : Indoor unit or Refrigerant branch kit
Header
Gas pipe
Outdoor
C
unit side
Liquid pipe
Outdoor
D
unit side
18
18,000
60
H = 0 to 3/8 in
1
(0 to 10 mm)
60,000
(α : 0° to 1°)
1
β : -10° to 10°
1
H = 0 to 3/8 in
2
(0 to 10 mm)
(α : 0° to 1°)
2
β : -10° to 10°
2
Do not connect a separation tube after a header.
Leave the distance 2 ft (0.5 m) or more for straight part to branch tube and header.
Main pipe
Main pipe
(0.5 m) or more
CAUTION
B
A
Horizontal line
GOOD
B
PROHIBITED
Horizontal line
1
H
1
Horizontal
line
2
H
2
GOOD
PROHIBITED
CAUTION
2 ft
(0.5 m) or more
Separation tube
To indoor unit
or
Header
2 ft
(0.5 m) or more
To indoor unit
To indoor unit
2 ft
(0.5 m) or more
Separation tube
or
2 ft
Header
To indoor unit
B
Vertical
or
A
Horizontal
1
line
VIEW C
Vertical
line
2
VIEW D
PROHIBITED
To indoor
unit
To indoor
unit