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4
Refrigerant piping
Refrigerant Piping
1. Use the following items for the refrigerant
piping.
Material : Seamless phosphorous deoxidized
copper pipe.
ø9.52 Wall thickness 0.8 mm or more
ø15.88 Wall thickness 1.0 mm or more
Do not use any copper pipes with a wall
thickness less than these thicknesses.
Knockout of pipe cover
Knockout procedure
Rear direction
Side direction
Front direction
Bottom direction
The indoor / outdoor connecting pipes can be
connected in 4 directions.
Take off the knockout part of the pipe cover through
which pipes or wires will pass through the base
plate.
Detach the pipe cover and tap on the knockout
section a few times with the shank of a screwdriver.
A knockout hole can easily be punched.
After punching out the knockout hole, remove burrs
from the hole and then install the supplied protective
bush and guard material around the passage hole to
protect wires and pipes.
Be sure to attach the pipe covers after pipes have
been connected. Cut the slits under the pipe covers
to facilitate the installation.
After connecting the pipes, be sure to mount the pipe
cover. The pipe cover is easily mounted by cutting off
the slit at the lower part of the pipe cover.
* Be sure to wear heavy work gloves while working.
Supplied protective bush
Supplied passage hole
guard material
* Attach the guard material
securely so that it does
not come loose.
Sticking RUBBER SHEET
after finish connecting of
PIPE-CONNECT follow as the picture.
RUBBER SHEET
Optional installation parts
(Locally procured)
Parts name
Q'ty
Refrigerant piping
A
Liquid side: Ø9.5 mm
One each
Gas side: Ø15.9 mm
Pipe insulating material
B
(polyethylene foam, 10 mm thick)
C
Putty, PVC tape
One each
– 7 –
Refrigerant piping connection
CAUTION
IMPORTANT 4 POINTS FOR PIPING WORK
1. Reusable mechanical connectors and flared
joints are not allowed indoors. When mechanical
connectors are reused indoors, sealing parts shall
be renewed.
When flared joints are reused indoors, the flare
part shall be refabricated.
2. Tight connection (between pipes and unit)
3. Evacuate the air in the connecting pipes by using
VACUUM PUMP.
4. Check the gas leakage. (Connected points)
Piping connection
Liquid side
Outer diameter
Ø9.5 mm
Gas side
Outer diameter
Ø15.9 mm
Flaring
1. Cut the pipe with a pipe cutter.
Be sure to remove burrs that may cause a gas leak.
2. Insert a flare nut into the pipe, and then flare the
pipe.
Use the flare nuts supplied with the air conditioner
or those for R32.
Insert a flare nut into the pipe, and flare the pipe.
Use the flare nuts supplied with the air conditioner
or flare nuts for R32 or R410A.
However, the conventional tools can be used by
adjusting the projection margin of the copper pipe.
Projection margin in flaring: B (Unit: mm)
Rigid (Clutch type)
Outer dia. of
R32/R410A
copper pipe
tool used
9.5
0 to 0.5
15.9
1
Flaring dia. size: A (Unit: mm)
Outer dia. of copper pipe
9.5
15.9
CAUTION
Do not scratch the inner surface of the flared part
when removing burrs.
Flare processing under the condition of scratches
on the inner surface of flare processing part will
cause refrigerant gas leak.
Thickness
Check that the flared part is not scratched,
0.8 mm
deformed, stepped, or flattened, and that there
are no chips adhered or other problems, after flare
processing.
Do not apply refrigerating machine oil to the flare
Thickness
surface.
1.0 mm
Tightening of connecting part
1
Align the centers of the connecting pipes
and fully tighten the fl are nut with your
fi ngers. Then fi x the nut with a wrench as
shown in the fi gure and tighten it with a
torque wrench.
Half union or packed valve
Externally
threaded side
B
Fix with wrench.
2
As shown in the fi gure, be sure to use two
wrenches to loosen or tighten the fl are nut
of the valve on the gas side. If you use a
single crescent, the fl are nut cannot be
Conventional
tightened to the required tightening torque.
tool used
On the other hand, use a single crescent to
1.0 to 1.5
loosen or tighten the fl are nut of the valve on
the liquid side.
A
+0
A
–0.4
13.2
19.7
Flare nut
Internally
threaded side
Tighten with torque
wrench.
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