En-5
4. SYSTEM
CONFIGURATION
For detailed information, refer to the Design and Technical Manual.
4.1. System
con
fi
guration
CAUTION
Always keep to the limit on the total amount of refrigerant. Exceeding the limit on the
total amount of refrigerant when charging will lead to malfunction.
• Between outdoor unit and the farthest indoor unit
a + f
≤
120 m, a + p
≤
120 m
• Between the first separation tube and the farthest indoor unit
f
≤
90 m, p
≤
90 m
• (The farthest indoor unit to the first separation tube) - (The nearest indoor unit to the first
separation tube)
f - (b + h)
≤
60 m, p - (c + q)
≤
60 m
• Between the nearest indoor unit and the outdoor unit
a + b + h
≥
5 m, a+c+q
≥
5 m
• Between outdoor unit and the first separation tube
a
≥
3 m
• Difference in height between outdoor units and indoor units (H1)
50 m or less: Outdoor unit is higher than indoor unit
40 m or less: Outdoor unit is lower than indoor unit
• Difference in height between indoor units and indoor units (H2, H3)
(Indoor unit "A*****G*AH") 50 m or less: Outdoor unit is higher than indoor unit
(Indoor unit "A*****G*AH") 40 m or less: Outdoor unit is lower than indoor unit
(Other indoor units) 15 m or less
• Maximum total equivalent pipe length
a + f + h + j + l + n + p + q + s + u
≤
400 m
• Total refrigerant amount
≤
20 kg
Fig. A
f
p
q
j
h
b
c
s
u
H3
l
n
H1
H2
a
Outdoor unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
4.2. Pipe
selection
CAUTION
This unit is designed specifically 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.
First separation
tube (optional)
Separation
tube (optional)
Pipe size
(table B)
Pipe size
(table C)
Pipe size
(table D)
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Table. A
(Wall thickness and pipe material for each diameter)
Outside
Diameter
mm
6.35
9.52
12.70 15.88 19.05
22.22
28.58
Wall Thick-
ness (*3)
mm
0.8
0.8)
0.8
1.0
1.2
1.0
1.0
Material
COPPER *1
JIS H3300 C1220T-O or equivalent
COPPER *2
JIS H3300 C1220T-H or
equivalent
Please select the pipe size in accordance with local rules.
*1: Allowable tensile stress
≥
33 (N/mm
2
)
*2: Allowable tensile stress
≥
61 (N/mm
2
)
*3: Endurance pressure of the pipes 4.2MPa
3.5. Installing the unit
• Please install the outdoor unit without slant. (within 0.3 degrees )
• Install 4 anchor bolts at the locations indicated with arrows in the figure.
• To reduce vibration, do not install the unit directly on the ground. Install it on a secure
base (such as concrete blocks).
• The foundation shall support the legs of the unit and have a width of 80 mm or more.
• Depending on the installation conditions, the outdoor unit may spread its vibration during
operation, which may cause noise and vibration. Therefore, attach damping materials
(such as damping pads) to the outdoor unit during installation.
• Install the foundation, making sure that there is enough space for installing the connec-
tion pipes.
• Secure the unit to a solid block using foundation bolts. (Use 4 sets of commercially avail-
able M10 to M12 bolts, nuts, and washers.)
• The bolts should protrude 20 mm. (Refer to the figure.)
• If overturning prevention is required, purchase the necessary commercially available
items.
AIR
688
195
195
80
80
19
20
516
Unit: mm
Bolt
Nut
Base
• Do not install directly on the ground, this may result in equipment failure.
• The drain water is discharged from the bottom of the equipment. Construct a drain ditch
around the base and discharge the drain water properly.
• Provide ample space for ice buildup from condensate between the bottom of the unit and
the flat surface on which it is mounted. Otherwise, there is risk that the drainage water
will freeze between the device and the surface, disabling drainage.
Base
CAUTION
If the unit is installed in a region that is exposed to
high winds, freezing conditions, freezing rain, snow
fall or heavy snow accumulation, take appropriate
measures to protect it from those elements.
To ensure stable operation, the outdoor unit must be
installed on a raised stand or rack, at or above the
anticipated snow depth for the region.
The installation of snow hoods and drift prevention
fencing is recommended when blowing and drifting
snow is common to the region.
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