En-8
Header•
Total cooling capacity of indoor unit (kW)
Header
*5
3-6 Branches 3-8 Branches
28.0 or less UTR-H0906L UTR-H0908L
28.1 to 56.0 UTR-H1806L UTR-H1808L
For the installation method, refer to the section on "Indoor unit pipe connections" *5.
below.
Protection of pipes4. 3.
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
Protection method
Outdoor
1 month or more Pinch pipes
Less than 1 month Pinch or tape pipes
Indoor
—
Pinch or tape pipes
PIPE INSTALLATION5.
Brazing5. 1.
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.
Fig.
Pressure regulating valve
Brazing area
Nitrogen gas
Cap
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.
Indoor unit pipe connections5. 2.
CAUTION
For details, refer to the Installation Instruction Sheet of each part.
Separation tube
A
B
A
B
B
A
GOOD
Horizontal
Vertical
Horizontal line
or
± 15°
A : Outdoor unit or Refrigerant branch kit
B : Indoor unit or Refrigerant branch kit
PROHIBITED
Header
C
H
1
A
1
B
1
D
H
2
A
2
B2
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
= 0 to 10 mm
H
2
= 0 to 10 mm
(α1: 0° to 1°)
β1: -10° to 10°
(α2: 0° to 1°)
β2: -10° to 10°
PROHIBITED 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.
Main pipe
0.5 m or more
To indo o r u n it
To indo o r u n it
To indo o r u n it
Main pipe
0.5 m or more
To indo o r
unit
Separation tube
or
Header
0.5 m or more
0.5 m or more
To indo o r u n it
or
Header
Separation tube
To indo o r
unit
Piping method5. 3.
Opening the knockout hole5. 3. 1.
CAUTION
Be careful to prevent panel deformation or damaged while opening the knockout
hole.
To prevent cutting of the wiring after the knockout hole was opened, remove the
burrs along the edge.
In addition, to prevent rusting, painting the edge with rust preventive paint is recom-
mended.
The piping can be connected from 2 directions; the front or the bottom.
(Knockout holes are provided so that the piping can be connected from 2 different
directions.)
Use the front knockout hole, as required.
A Knockout positionFig.
9378945104-01_IM.indb Sec1:89378945104-01_IM.indb Sec1:8 2013-3-12 14:08:202013-3-12 14:08:20
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