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5. PIPE INSTALLATION
5.1. Brazing
CAUTION
If air or another type of refrigerant enters the refrigera-
tion cycle, the internal pressure in the refrigeration
cycle will become abnormally high and prevent the
unitfromexertingitsfullperformance.
Pressure regulating valve
Cap
Nitrogen gas
Braze joint
Apply nitrogen gas while brazing the pipes.
Nitrogengaspressure:0.02MPa(=pressurefeltsuf-
ficiently on the back of your hand)
Ifapipeisbrazedwithoutapplyingnitrogengas,itwillcreateanoxidationfilm.
This can degrade performance or damage the parts in the unit (such as the compressor
or valves).
Donotusefluxtobrazepipes.Ifthefluxisthechlorinetype,itwillcausethepipesto
corrode.
In additio
n,ifthefluxcontainsfluoride,itwillaffecttherefrigerantpipingsystemdueto
deterioration of refrigerant oil.
Forbrazingmaterial,usephosphorcopperthatdoesnotrequireflux.
5.2. Indoor unit pipe connections
CAUTION
For details, refer to the Installation Instruction Sheet of each part.
Separation tube
A:
To outdoor unit or refrigerant
branch kit
B:
To Indoor unit or refrigerant
branch kit
A
B
A
B
B
A
GOOD GOOD
Horizontal
Vertical
Horizontal line
Refer to the
table below (*1)
or
Separation tube *1: Allowable mounting angle
Other than UTP-AX792B ±15°
UTP-AX792B ±5°
PROHIBITED
Header
C
H
1
α
1
β
1
D
H
2
α
2
β2
GOOD
GOOD
Horizontal line
Horizontal line
View
D
View C
Horizontal line
Vertical line
Gas pipe
Liquid pipe
Outdoor
unit side
Outdoor
unit side
H
1
=0to10mm
H
2
=0to10mm
(α
1
: 0° to 1°)
β
1
: -10° to 10°
(α
2
: 0° to 1°)
β
2
: -10° to 10°
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.
To indoor unit
To indoor unit
To indoor unit
Main pipe
Main pipe
0.5 m or more
0.5 m or more
To indoor unit
Separation tube
Header
To indoor unit
0.5 m or more
0.5 m or more
To indoor unit
Separation tube
Header
5.3. Opening for piping
CAUTION
Be careful to prevent panel deformation or damaged while opening the knockout.
To prevent cutting of the wiring after the knockout was opened, remove the burrs along
the edge. In addition, to prevent rusting, painting the edge with rust preventive paint is
recommended.
The piping can be connected from 2 directions; the front or the bottom.
(Knockouts are provided so that the piping can be connected from 2 different directions.)
Use the front knockout, as required.
80
57
197
125
75
95101
111
19998
138
97
Fig. A Knockout position
Fig B Detail of knockout position
(bottom)
Fig C Detail of knockout posi-
tion (front)
(Unit: mm)
(Unit: mm)
Knockout
Knockout
5.4. Pipe connection
CAUTION
Do not use mineral oil on a flared part. Prevent mineral oil from getting into the system
as this would reduce the lifetime of the units.
While brazing the pipes, be sure to blow dry nitrogen gas through them.
Themaximumlengthsofthisproductareshowninthetable.Iftheunitsarefurther
apart than this, correct operation cannot be guaranteed.
5.4.1 Bending pipes
CAUTION
To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of
curvature of 100 mm or more.
If the pipe is bent repeatedly at the same place, it will break.
• If pipes are shaped by hand, be careful not to collapse them.
• Do not bend the pipes at an angle of more than 90°.
• When pipes are repeatedly bent or stretched, the material will harden, making it difficult
to bend or stretch them anymore.
• Do not bend or stretch the pipes more than 3 times.
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Productinformatie
| Merk | Fujitsu |
| Model | AJG090JATAH |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 5576 MB |
