Fresh Air Intake - Fujitsu ARXG-KHTAP Series Installation Manual

3. 6. 1. Pipe connection
■ Flaring
Use special pipe cutter and fl are tool designed for R410A or R32 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 or R32 fl are tool, or the conventional fl are tool. Leak-
age 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 [mm]
Pipe outside
diameter
Flare tool for R32,
[mm (in.)]
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)
When using conventional fl are tools to fl are R32 pipes, the dimension A should be
approximately 0.5 mm more than indicated in the table (for fl aring with R32 fl are tools) to
achieve the specifi ed fl aring. Use a thickness gauge to measure the dimension A.
Width across
fl ats
diameter [mm (in.)]
NOTE: The fl are nut specifi cation is compliant with ISO14903.
■ 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.
• To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of
curvature of 150 mm or over.
• If the pipe is bent repeatedly at the same place, it will break.
■ Flare connection
• 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.
• Do not remove the fl are nut from the indoor unit pipe until immediately before
connecting 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.)
Check if [L] is fl ared uniformly
and is not cracked or scratched.
L
0
Dimension B [mm]
- 0.4
9.1
13.2
16.6
19.7
24.0
Pipe outside Width across fl ats
of Flare nut [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
• 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.
Torque wrench
Indoor unit pipe
(Body side)
Flare nut [mm (in.)] Tightening torque [N·m (kgf·cm)]
6.35 (1/4) dia.
9.52 (3/8) dia.
12.70 (1/2) dia.
15.88 (5/8) dia.
19.05 (3/4) dia.

3. 7. Fresh air intake

■ Processing before use
(1) When taking in fresh air, cut out the slit of the cabinet on the left side of the outer case
with nippers.
Slit
• When removing the cabinet (iron plate), be careful not to damage the indoor unit
internal parts and surrounding area (outer case).
• When processing the cabinet (iron plate), be careful not to injure yourself with burrs,
etc.
• When using the Fresh air intake, set the Room temperature sensor switching (Aux.)
to "Wired Remote Controller" (01), or to use the Remote sensor.
(2) Install the round fl ange to the fresh air intake.
Round fl ange (Locally purchased)
(3) Connect the duct to the round fl ange.
(4) Seal with a band and vinyl tape, etc. so that air does not leak from the connection.
Duct
CAUTION
Tighten with 2 wrenches.
Holding Wrench
Flare nut
Connection pipe
16 to 18 (160 to 180)
32 to 42 (320 to 420)
49 to 61 (490 to 610)
63 to 75 (630 to 750)
90 to 110 (900 to 1,100)
Cabinet (iron plate)
CAUTION
En-9