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13
3.Processing of Refrigerant Piping
(1) Pipe cutting
Cut the copper pipe correctly with a pipe cutter.
(2) Burrs removal
Completely remove all burrs from the cross section of the pipe.
Put the end of the copper pipe downward to prevent burrs from
dropping in the pipe.
(3) Putting nut on
Remove flare nuts attached to indoor and outdoor units, then put
them on the pipe, burrs of which have been removed.
(Not possible to put them on after flaring work).
Flare nut for pipe depends on the diameter of pipe.
(4) Flaring work
Perform flaring work with a flaring tool as shown below.
(5) Check
Compare the flared work with the figure below.
If flare is noted to be defective, cut off the flared section and perform flaring work again.
When installing pipe through
the wall, secure a cap at the
end of the pipe.
Correct
CorrectIncorrect Incorrect
Correct Incorrect
HoleHole
Attach a cap
or vinyl tape.
Attach a cap
or vinyl tape.
Attach a cap
or vinyl bag with
rubber band.
Do not place the pipe
directly on the ground.
Rain water can
enter.
Diameter
Tilted Uneven Burred
Not good
Good
o
90
Burr
Copper pipe
Spare
reamer
Pipe cutter
Flare nut
Copper pipe
Flaring tool
Clutch type
Wing nut type
Die
Copper pipe
Flare nut
Copper pipe
Die
York
Smooth all around
Inside is shiny without any scratches
Double Spanner Work
Tightening Torque for Flare Nut
15.88
19.05*
*: Perform the flaring work with
type O material.
24.0
19.7
Installation Instructions
(Unit: mm)
！
CAUTION
12.7
9.52
6.35
9.1
13.2
16.6
φ6.35
φ9.52
φ12.7
φ15.88
φ19.05
Tube size (mm)
100
80
60
40
20
Torque N·m ( )
4. Piping connection
(1) Confirm that the valve is closed.
(2) Connect the indoor unit and the outdoor unit with field-supplied
refrigerant piping. Suspend the refrigerant piping at certain points
and prevent the refrigerant piping from touching the weak part of
the building such as wall, ceiling, etc.
(If touched, abnormal sound may occur due to the vibration of the
piping. Pay special attention in case of short piping length.)
(3) Tighten the flare nut with two spanners (one being a torque
wrench) as shown in the right figure.
(4) Apply the refrigerant oil (field-supplied) thinly at the seat surface of
the flare nut and pipe before connecting and tightening.
And when tightening the flare nut, use two spanners.
(5) Outdoor refrigerant piping should connect with stop valve.
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