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2-5. FLARING WORK
1) Cut the copper pipe correctly with pipe cutter.
(Fig. 1, 2)
2) Completely remove all burrs from the cut
cross section of pipe. (Fig. 3)
• Put the end of the copper pipe to
downward direction as you remove burrs
in order to avoid to let burrs drop in the
piping.
3) Remove flare nuts attached to indoor and
outdoor units, then put them on pipe having
completed burr removal. (Not possible to put
them on after flaring work.)
4) Flaring work (Fig. 4, 5). Firmly hold copper
pipe in the dimension shown in the table.
Select A mm from the table according to the
tool you use.
5) Check
• Compare the flared work with Fig. 6.
• If flare is noted to be defective, cut off the flared section and do flaring
work again.
Copper pipe
Burr
Spare reamer
Pipe cutter
Fig. 3
Copper pipe
Die
Flare nut
Fig. 5
A (mm)
Clutch
Clutch
Pipe diameter
Nut
type
(mm)
(mm)
tool
for
for R22
R410A
ø 6.35 (1/4")
17
ø 9.52 (3/8")
22
1.0 to
0 to 0.5
ø12.7 (1/2")
26
ø15.88 (5/8")
29
2-6. PIPE CONNECTION
• Fasten flare nut with a torque wrench as specified in the table.
• When fastened too tight, flare nut may break after a long period and cause
refrigerant leakage.
• Be sure to wrap insulation around the piping. Direct contact with the bare
piping may result in burns or frostbite.
Indoor unit connection
Connect both liquid and gas pipings to indoor unit.
• Apply a thin coat of refrigeration oil (J) on the flared ends of the pipes. Do not
apply refrigeration oil on screw threads. Excessive tightening torque will result
in damage on the screw.
• For connection, first align the center, then tighten the first 3 to 4 turns of flare
nut.
• Use tightening torque table above as a guideline for indoor unit side union
joint section, and tighten using two wrenches. Excessive tightening damages
the flare section.
Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit in the same manner
applied for indoor unit.
• For tightening, use a torque wrench or spanner and
use the same tightening torque applied for indoor
unit.
WARNING
When installing the unit, securely connect the
refrigerant pipes before starting the compressor.
Copper
pipe
Fig. 1
No good
Good
Tilted Uneven Burred
Fig. 2
Flaring tool
Clutch type
Wing nut type
Fig. 4
Inside is shining with-
out any scratches.
Smooth all
around
Even length
Fig. 6
all around
Tightening torque
Wing
type
nut type
N•m
kgf•cm
tool
tool
for R22
13.7 to 17.7 140 to 180
1.5 to
2.0
34.3 to 41.2 350 to 420
1.5
49.0 to 56.4 500 to 575
2.0 to
2.5
73.5 to 78.4 750 to 800
2-7. INSULATION AND TAPING
1) Cover piping joints with pipe cover.
2) For outdoor unit side, surely insulate every piping including valves.
3) Using piping tape (G), apply taping starting from the entry of outdoor unit.
• Stop the end of piping tape (G) with tape (with adhesive agent at-
tached).
• When piping have to be arranged through above ceiling, closet or where
the temperature and humidity are high, wind additional commercially
sold insulation to prevent condensation.
2-8. CONNECTING AN INTERFACE (MAC-
333/397/399 IF-E, option) TO THE AIR CONDI-
TIONER
• Connect an interface to the indoor control P.C. board of an air condi-
tioner with a connecting cable.
• Cutting or extending the connecting cable of the interface results in
defects in connecting. Do not bundle the connecting cable together with
power supply cord, indoor/outdoor connecting wire, and/or earth wire.
Keep as much distance as possible between the connecting cable and
those wires.
• The thin part of the connecting cable should be stored and placed
where customers cannot touch it.
Thin part of the connecting cable.
Place this part where customers
Room air
cannot touch it.
conditioner
Indoor control
CN105
P.C. board
1) Remove the front panel and the lower right corner part.
2) Open the cover of the indoor control P.C. board.
3) Join the connecting cable to CN 105 on the indoor control P.C. board.
4) Route the connecting cable through this point in the figure.
5) Attach the cable clamp provided with Interface to the thick part of the con-
necting cable with a screw 4x16 as shown in the figure.
6) Close the cover of the indoor control P.C. board. Be careful not to catch the
thin part of the connecting cable in the cover. Reinstall the front panel and
the lower right corner part.
5)
WARNING
Fix the connecting cable at the prescribed position securely.
Incorrect installation may cause electric shock, fire, and/ or malfunction
Main body of an interface
Connector
Thick part of the connecting cable
3) CN 105
4)
En-4
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