Flare Connection (Pipe Connection); Forming Piping; Note On Drain Hose - Fujitsu AirStage AG A012GCGH Series Installation Manual

4.3. Flare connection (pipe connection)

Tighten the flare nuts with a torque wrench using the specified tightening method. Oth-
erwise, the flare nuts could break after a prolonged period, causing refrigerant to leak
and generate hazardous gas if the refrigerant comes into contact with a flame.
4.3.1 Flaring
Use special flare tool exclusive for R410A.
(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 flare nut (always
use the flare nut attached to
the indoor and outdoor units
(or RB unit) respectively)
onto the pipe and perform
the flare processing with a
flare tool. Use the special
R410A flare tool. Leakage of
refrigerant may result if other
flare nuts are used.
(4) Protect the pipes by pinching
them or with tape to prevent
dust, dirt, or water from
entering the pipes.
When using conventional (R22)
flare tools to flare R410A pipes, the
dimension A should be approxi-
mately 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.
4.3.2 Bending pipes
• The pipes are shaped by your hands or pipe bender. 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 difficult
to bend or stretch them anymore. Do not bend or stretch the pipes more than 3 times.
To prevent breaking of the pipe, avoid sharp bends.
If the pipe is bent repeatedly at the same place, it will break.
4.3.3 Pipe connection
Be sure to install the pipe against the port on the indoor unit and the outdoor unit
correctly. If the centering is improper, the flare nut cannot tightened smoothly. If the flare
nut is forced to turn, the threads will be damaged.
Do not remove the flare nut from the indoor unit pipe until immediately before connect-
ing the connection pipe.
Do not use mineral oil on flared part. Prevent mineral oil from getting into the system as
this would reduce the lifetime of the units.
Hold the torque wrench at its grip, keeping it at a right angle with the pipe, in order to
tighten the flare nut correctly.
When the flare nut is tightened properly by
your hand, hold the body side coupling with a
separate spanner, then tighten with a torque
wrench. (Refer to the table below for the flare
nut tightening torques.)
Flare nut Tightening torque
[mm (in)] [N·m (kgf·cm)]
6.35 (1/4) dia. 16 to 18 (160 to 180)
9.52 (3/8) dia. 32 to 42 (320 to 420)
12.70 (1/2) dia. 49 to 61 (490 to 610)
15.88 (5/8) dia. 63 to 75 (630 to 750)
19.05 (3/4) dia. 90 to 110 (900 to 1,100)

4.4. Forming piping

(1) Pass the refrigerant pipe through the piping hole to indoor side.
(2) Arrange the pipes according to the direction of piping.
En-5
WARNING
Check if [L] is
flared uniformly
and is not cracked
or scratched.
Die
Pipe
Dimension A
Pipe outside [mm]
diameter (Flare tool for
[mm (in)] R410A, clutch
type)
6.35 (1/4)
9.52 (3/8)
12.70 (1/2) 0 to 0.5
15.88 (5/8)
19.05 (3/4)
Pipe outside Width across
diameter flats of flare nut
[mm (in)] [mm]
6.35 (1/4) 17
9.52 (3/8) 22
12.70 (1/2) 26
15.88 (5/8) 29
19.05 (3/4) 36
CAUTION
CAUTION
Torque
wrench
Indoor unit pipe
Connection pipe
(body side)
Rear piping
Floor
NOTE :
In the case of left piping, first form the pipe and then connect it to the indoor unit.

4.5. Note on drain hose

Dimension
0
B [mm]
-0.4
Insert drain hose and drain cap securely. Drain should slope down to avoid water leakage.
9.1
When inserting, be sure not to attach any material besides water. If any other material is
13.2
attached, it will cause deterioration and water leakage.
16.6
After removing drain hose, be sure not to forget mounting drain cap.
19.7
Be sure to fix the drain hose with tape to the bottom of piping.
24.0
Prevent drain water freezing under low temperature environment.
When installing indoor unit's drain hose outdoors, necessary measure for frost protec-
tion should be taken to prevent drain water freezing.
Width across
Under low temperature environment (when outdoor temperature under 0 °C), after
flats
cooling operation is executed, water in the drain hose could be frozen.
Once drain water is frozen, the drain hose will be blocked and water leakage may result
at the indoor unit.
The drain hose can be connected at
either side of the indoor unit.
The unit has been shipped with the drain
hose connected at left (viewed from the
back of the unit) and the drain cap applied
at right.
(1) Remove the both side panels.
(2) Remove the screw and remove the
drain holder from drain pan.
(3) Pull out the drain cap.
(4) Connect the drain hose to the right,
attach the screw and insert the drain
cap to the left.
Drain pan
Drain holder
Tighten with 2
wrenches.
Holding
wrench
Flare nut
Installation method of Drain cap
Use a hexagonal wrench (4 mm at opposite
side) to insert the drain cap, till the drain cap
contacts the tip of drain cook.
Insert the drain hose and drain cap into the drain port, making sure that it comes in con-
tact with the back of the drain port, and then mount it. If the drain hose is not connected
properly, leaking will occur.
Left piping
Right piping
Center of
wall hole
100 mm
100 mm
130 mm
130 mm
CAUTION
Drain hose
Screw
Drain hose
Drain cap
Screw
Hexagon
wrench
CAUTION
Back wall
590 mm
590 mm
Back wall
30 mm
30 mm
Drain
Drain
cap
hose
Drain pan
Drain cap
Drain holder
No gap
Drain cock
Drain cap