System Configuration; Pipe Selection; Protection Of Pipes; Pipe Installation - Fujitsu Airstage AOU36RLAVS Installation Manual

6-9/16 25-9/16
(166) (650)
1-15/16
(50)
AIR
• Do not install directly on the ground, this may result in equipment failure.
• 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 preven-
Base
tion fencing is recommended when blowing and
drifting snow is common to the region.

4. SYSTEM CONFIGURATION

4.1. System confi guration
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 + d ≤ 164 ft (50 m), a + h ≤ 164 ft (50 m)
• Between the first separation tube and the farthest indoor unit
d ≤ 131 ft (40 m), h ≤ 131 ft (40 m)
• Between the nearest indoor unit and the outdoor unit
a + b + e ≥ 16 ft (5 m), a+c+i ≥ 16 ft (5 m)
• Between outdoor unit and the first separation tube
a ≥ 9 ft (3 m)
• Difference in height between outdoor units and indoor units (H1)
98 ft (30 m) or less: Outdoor unit is higher than indoor unit
98 ft (30 m) or less: Outdoor unit is lower than indoor unit
• Difference in height between indoor units and indoor units
H2 ≤ 49 ft (15 m), H3 ≤ 49 ft (15 m)
• Maximum total equivalent pipe length
a + d + e + f + g + h + i + j + k ≤ 262 ft (80 m)
• Total refrigerant amount ≤ 15 lb (6.83 kg)
Fig. A
a
d
b
f
e Indoor
c
unit
h
Indoor
i
unit

4.2. Pipe selection

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)
Pipe size
(table B)
Indoor Indoor
unit unit
En-5
6-1/16
Unit: in (mm)
(154)
1-15/16
Bolt
(50)
CAUTION
CAUTION
Outdoor unit
g
Indoor Indoor Indoor
unit unit unit
j Indoor k Indoor
unit unit
Indoor
H3
unit
CAUTION
Separation tube
(optional)
Indoor Indoor Indoor Indoor
unit unit unit unit
Table. A (Wall thickness and pipe material for each diameter)
Outside Diameter
Nut
Wall Thickness *2
Base
Material
Please select the pipe size in accordance with local rules.
*1: Allowable tensile stress ≥ 33 N/mm
*2: Endurance pressure of the pipes 609 psi (4.2 MPa)
Table. B (Diameter of piping used between outdoor unit and first separation
tubes or headers)
MODEL
AOU36RLAVS
AOU48RLAVS
Table. C (Diameter of piping used between separation tubes)
Outside diameter [in (mm)]
Liquid pipe
3/8 (9.52)
*3: For the installation method, please refer to the installation manuals for indoor unit,
separation tubes or headers.
Use a standard separation tube for pipe branching. Do not use a T tube as it does not
separate the refrigerant evenly.
Table. D (Diameter of piping used between separation tube and indoor unit)
Cooling capacity of indoor unit
[Btu]
7,500 / 9,500 / 12,000 / 14,000
18,000 / 24,000 / 30,000
36,000 / 48,000 / 60,000 *4
*4: If pipe diameter Table D > Table C , using of pipe size from Table C is preferable.
(Use reducer to change the diameter of connection pipe.)
When one indoor unit is connected to the outdoor unit.
• Please use a reducer (locally purchased) to match the piping diameter of the outdoor
unit to the indoor unit valve. Attach the reducer to the indoor unit valve.
• For the valve size of the indoor unit, refer to the installation manual of the indoor unit
or Design and Technical Manual.
Connection example
Outdoor unit: AOU36RLAVS

4.3. Protection of pipes

Location
Outdoor
Indoor
• Protect the pipes to prevent the entry of moisture and dust.
H1
• Especially pay attention when passing the pipes through a hole or connecting the end of
a pipe to the outdoor unit.

5. PIPE INSTALLATION

H2

5.1. Brazing

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
unit from exerting its full performance.
Apply nitrogen gas while brazing the pipes.
Nitrogen gas pressure: 2.9 psi (0.02 MPa)
(= pressure felt sufficiently on the back of your hand)
If a pipe is brazed without applying nitrogen gas, it will create an oxidation film.
This can degrade performance or damage the parts in the unit (such as the compressor
or valves).
Pipe size
(table C)
Do not use flux to braze pipes. If the flux is the chlorine type, it will cause the pipes to
corrode.
Pipe size
In addition, if the flux contains fluoride, it will affect the refrigerant piping system due to
(table D)
deterioration of refrigerant oil.
For brazing material, use phosphor copper that does not require flux.
in 1/4 3/8
(mm) (6.35) (9.52)
in
0.032 0.032
(mm)
(0.8) (0.8)
COPPER *1 JIS H3300 C1220T-O or equivalent
Diameter of piping [in (mm)]
Outdoor unit cooling
capacity [Btu]
Liquid pipe
36,000 3/8 (9.52)
48,000 3/8 (9.52)
Separation tube *3
Gas pipe
5/8 (15.88) UTP-AX054A
Outside diameter [in (mm)]
Liquid pipe
1/4 (6.35)
3/8 (9.52)
Gas pipe size:
5/8 in (15.88 mm)
Reducer
(locally purchased)
Working period
1 month or more Pinch pipes
Less than 1 month Pinch or tape pipes
— Pinch or tape pipes
CAUTION
1/2 5/8
(12.70) (15.88)
0.032 0.039
(0.8) (1.0)
Gas pipe
5/8 (15.88)
5/8 (15.88)
Header *3
UTR-H0906L
UTR-H0908L
Gas pipe
1/2 (12.70)
5/8 (15.88)
3/4 (19.05)
Indoor unit: ARUM36TLAV
Gas valve size:
3/4 in (19.05 mm)
Protection method
Pressure regulating valve
Cap
Nitrogen gas
Brazing area