Pipe Installation; Selecting The Pipe Material - Fujitsu ABYA12-24LBTH Installation Manual

B-2. Drilling the holes and attaching the
suspension bolts
Drill Φ25 mm holes at the suspension bolt locations, then
install the bolts.
Bolt Strength
Ceiling panel
20 to 50 mm
[If using anchor bolts]
Drill holes for anchor bolts at the locations at which you will
set the suspension bolts. Note that anchor bolts are M10 bolts
(to be obtained locally).
Anchor-Bolt Strength
B-3. Installing Brackets
Install the bracket with nuts, spring washers.
Ceiling panel
Spring washer
(Field supply)
B-4. Installing indoor unit
Reset the hex bolts as shown in the fi gure
Indoor unit
Apply the indoor unit to the brackets.
Now, securely tighten the hex bolts in both sides.
En-6
980 to 1470 N (100 to 150 kgf)
ø25 mm
980 to 1470 N (100 to 150 kgf)
Ceiling
20 to
50 mm
M10 Anchor bolt
(Field supply)
Special nut A
(Accessories)
Bracket
Bracket (Right)
M10 Nut (Field supply)
M10 Nut (Field supply)
Hex bolt
8 to 13
Unit : mm
Bracket
Bolt
Indoor unit
3.3.3. Barrier and RFM base removal and
(1) Remove the barriers by removing the 4 fi xing screws
(2 screws each).
(2) Remove the RFM base by removing the 2 fi xing screws
and unhooking the 1 hook.
(3) After completing the work, install the barriers and RFM
base as they were originally.
Fixing screw
(2 positions)
Install the barriers in the correct direction.

4. PIPE INSTALLATION

Bracket (Left)
]
• Be more careful that foreign matter (oil, water, etc.) does
not enter the piping than with refrigerant R410A models.
Also, when storing the piping, securely seal the openings
by pinching, taping, etc.
• While welding the pipes, be sure to blow dry nitrogen gas
through them.
] 1

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.
installation
Barriers
Fixing screw
(2 positions)
CAUTION
CAUTION
Hook
RFM base