Pipe Installation; Pipe Connection - Fujitsu 9384203007-04 Manuel D'installation

Indoor unit
• Make provisions for disconnecting and cleaning of the primary drain line should it be-
come necessary. Install a 3 in (77 mm) trap in the primary drain line as close to the unit
as possible. Make sure that the top of the trap is below connection to the drain pan to
allow complete drainage of pan.
Condensate drain trap
• The auxiliary drain line should be run to a place where it will be noticeable if it becomes
operational. The building occupant should be warned that a problem exists if water
should begin running from the auxiliary drain line. An auxiliary drain shut-off switch can
be installed in lieu of an auxiliary drain line. The shut-off switch should be wired into the
control circuit so the outdoor unit shuts down should the switch detect water.
• Plug the unused drain connection with the plugs provided in the parts bag, using a thin
layer of tefl on paste, silicone or tefl on tape to form a water tight seal.
• Test the condensate drain pan and drain line after installation is complete. Pour water
into drain pan, enough to fi ll drain trap and line. Check to make sure drain pan is drain-
ing completely, no leaks are found in drain line fi ttings, and water is draining from the
open end of the primary drain line.

3. 6. Pipe installation

• During installation, make sure that the refrigerant pipe is attached fi rmly before you
run the compressor.
Do not operate the compressor under the condition of refrigerant piping not attached
properly with 2-way or 3-way valve open. This may cause abnormal pressure in the
refrigeration cycle that leads to breakage and even injury.
• During the pump-down operation, make sure that the compressor is turned off before
you remove the refrigerant piping.
Do not remove the connection pipe while the compressor is in operation with 2-way
or 3-way valve open. This may cause abnormal pressure in the refrigeration cycle
that leads to breakage and even injury.
• When installing and relocating the air conditioner, do not mix gases other than the
specifi ed refrigerant (R410A) to enter the refrigerant cycle.
If air or other gas enters the refrigerant cycle, the pressure inside the cycle will rise to
an abnormally high value and cause breakage, injury, etc.
• If refrigerant leaks while work is being carried out, ventilate the area. If the refrigerant
comes in contact with a fl ame, it produces a toxic gas.
• Be more careful so that foreign matter (oil, water, etc.) does not enter the piping than
with refrigerant R410A models. Also, when storing the piping, securely seal the open-
ings by pinching, taping, etc.
• While brazing the pipes, be sure to blow dry nitrogen gas through them.
En-10
9384203007-04.indb 10 9384203007-04.indb 10
Drain hose insulation
(Accessory)
Drain hose
3-15/16 in
(100 mm)
3 in min. (77 mm min.)
3 in min. (77 mm min.)
WARNING
CAUTION

3. 6. 1. Pipe connection

■ Flaring
Use special pipe cutter and fl are tool designed for R410A pipework.
(1) Cut the connection pipe to the necessary length with a pipe cutter.
(2) Hold the pipe downward so that cuttings will not enter the pipe and remove any burrs.
(3) Insert the fl are nut (always use the fl are nut attached to the indoor unit(s) and outdoor
unit or branch box respectively) onto the pipe and perform the fl are processing with a
fl are tool. Use the special R410A fl are tool, or the conventional fl are tool. Leakage of
refrigerant may result if other fl are nuts are used.
(4) Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from
entering the pipes.
B
Die
A
Pipe
Dimension A [in (mm)]
Pipe outside diameter
Flare tool for R410A,
[in (mm)]
clutch type
1/4 (6.35)
3/8 (9.52)
0 to 0.020
1/2 (12.70)
(0 to 0.5)
5/8 (15.88)
3/4 (19.05)
When using conventional (R22) flare tools to flare R410A pipes, the dimension A should
be approximately 0.020 in (0.5 mm) more than indicated in the table (for flaring with
R410A flare tools) to achieve the specified flaring. Use a thickness gauge to measure the
dimension A. It is recommended that a R410A flaring tool is used.
Width across Pipe outside diameter
fl ats
[in (mm)]
1/4 (6.35)
3/8 (9.52)
1/2 (12.70)
5/8 (15.88)
3/4 (19.05)
■ Bending pipes
• If pipes are shaped by hand, be careful not to collapse them.
• Do not bend the pipes in an angle more than 90°.
• When pipes are repeatedly bend or stretched, the material will harden, making it diffi cult
to bend or stretch them any more.
• Do not bend or stretch the pipes more than 3 times.
CAUTION
• To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of
curvature of 1- 15/16 in (50 mm) or over.
• If the pipe is bent repeatedly at the same place, it will break.
■ Flare connection
CAUTION
• Be sure to apply the pipe against the port on the indoor unit correctly. If the centering
is improper, the fl are nut cannot be tightened smoothly. If the fl are nut is forced to
turn, the threads will be damaged.
• For additional clearance space around the half union, remove corner panel when
making pipe connection.
• Do not remove the fl are nut from the indoor unit pipe until immediately before con-
necting the connection pipe.
• Do not use mineral oil on fl ared part. Prevent mineral oil from getting into the system
as this would reduce the lifetime of the units.
(1) Detach the caps and plugs from the pipes.
(2) Centering the pipe against port on the indoor unit, turn the fl are nut with your hand.
(3) When the fl are nut is tightened properly by your hand, hold the body side coupling with
a separate spanner, then tighten with a torque wrench. (See the table below for the
fl are nut tightening torques.)
CAUTION
• Hold the torque wrench at its grip, keeping it in the right angle with the pipe, in order
to tighten the fl are nut correctly.
• Tighten the fl are nuts with a torque wrench using the specifi ed tightening method.
Otherwise, the fl are nuts could break after a prolonged period, causing refrigerant to
leak and generate a hazardous gas if the refrigerant comes into contact with a fl ame.
Check if [L] is fl ared uniformly
and is not cracked or scratched.
L
Dimension B 0 (0)
-0.015 (-0.4)
[in (mm)]
3/8 (9.1)
1/2 (13.2)
5/8 (16.6)
3/4 (19.7)
15/16 (24.0)
Width across flats of Flare
nut [in (mm)]
11/16 (17)
7/8 (22)
1 (26)
1-1/8 (29)
1-7/16 (36)
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