Pipe Selection; Selecting The Pipe Material; Protection Of Pipes; Refrigerant Pipe Size And Allowable Piping Length - Fujitsu AOYG72LRLA Installation Manual

• 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.
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.
Base

4. PIPE SELECTION

4.1. Selecting the pipe material

Do not use existing pipes.
Use pipes that have clean external and internal sides without any contamination which
may cause trouble during use, such as sulfur, oxide, dust, cutting waste, oil, or water.
It is necessary to use seamless copper pipes.
Material: Phosphor deoxidized seamless copper pipes.
It is desirable that the amount of residual oil is less than 40 mg/10 m.
Do not use copper pipes that have a collapsed, deformed, or discolored portion
(especially on the interior surface).
Otherwise, the expansion valve or capillary tube may become blocked with contaminants.
Improper pipe selection will degrade performance. As an air conditioner using R410A
incurs pressure higher than when using conventional refrigerant, it is necessary to
choose adequate materials.
• Thicknesses of copper pipes used with R410A are as shown in the table.
• Never use copper pipes thinner than those indicated in the table even if they are
available on the market.
Table. A (Wall thickness and pipe material for each diameter)
Outside
mm
6.35 9.52
Diameter
Wall Thick-
mm
0.8 0.8
ness *3
COPPER *1
Material
JIS H3300 C1220T-O or equivalent
Please select the pipe size in accordance with local rules.
*1: Allowable tensile stress ≥ 33 (N/mm
*2: Allowable tensile stress ≥ 61 (N/mm
*3: Endurance pressure of the pipes 4.2MPa

4.2. 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

4.3. Refrigerant pipe size and allowable piping length

Keep the piping length between the indoor unit and outdoor unit within the allowable
tolerance.
4.3.1. Single type installation
Capacity [BTU/h class]
Pipe diameter <Liquid/Gas> [mm (in.)]
Max. piping length (L)
Min. piping length (L)
Max. height difference (H)
<Indoor unit to outdoor unit>
View (Example)
En-5
CAUTION
CAUTION
12.70 15.88 19.05 22.22
0.8 1.0 1.2 1.0
COPPER *2
JIS H3300 C1220T-H or equivalent
)
2
)
2
Protection method
Pinch pipes
Pinch or tape pipes
- Pinch or tape pipes
CAUTION
72,000
12.70 (1/2) / 25.40 (1)
[m] 100
[m] 5
30
[m]
Indoor Unit
L
4.3.2. Simultaneous operation multi type installation
Be certain to install indoor units in the same room because the combinations are for
simultaneous operation.
The lengths after branching should be equal if possible.
Twin type
Capacity [Btu/h class]
Indoor unit capacity
[Btu/h class]
Main pipe diameter (L1)
<Liquid/Gas>
(Standard)
Branch pipe diameter (L2, L3)
<Liquid/Gas>
Max. piping length
(L1+L2+L3)
Min. piping length
(L1+L2+L3)
Max. branch piping
length (L2, L3)
Max. difference between branch lengths
(L2 to L3)
Max. height difference (H1)
<Indoor unit to outdoor unit>
Max. height difference (H2)
<Indoor unit to indoor unit>
View (Example)
*1: For the standard pipe diameter.
Triple type
Capacity [Btu/h class]
28.58
Indoor unit capacity
[Btu/h class]
1.0
Main pipe diameter (L1)
<Liquid/Gas>
(Standard)
Branch pipe diameter
(L2, L3, L4)
<Liquid/Gas>
Max. piping length
(L1+L2+L3+L4)
Min. piping length
(L1+L2+L3+L4)
Max. branch piping length
(L2, L3, L4)
Max. difference between piping lengths
(L2, L3, L4)
Max. height difference (H1)
<Indoor unit to outdoor unit>
Max. height difference (H2)
<Indoor unit to indoor unit>
View (Example)
*1: For the standard pipe diameter.
90,000
H
CAUTION
72,000
36,000
+ 36,000
12.70 (1/2) / 25.40 (1)
[mm (in.)]
9.52 (3/8) / 15.88 (5/8)
[mm (in.)]
*1
100
[m]
5
[m]
20
[m]
8
[m]
30
[m]
0.5
[m]
Indoor Unit
L2
H2
L3
72,000
24,000 + 24,000 30,000 + 30,000
+ 24,000
12.70 (1/2) / 25.40 (1)
[mm (in.)]
9.52 (3/8) / 15.88 (5/8)
[mm (in.)]
*1
100
[m]
5
[m]
20
[m]
8
[m]
30
[m]
0.5
[m]
Indoor Unit
L2
L3
H2
L4
90,000
45,000
+ 45,000
L1
H1
90,000
+ 30,000
L1
H1