8
Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
3-2. FLARING WORK
Pipe
diameter
(mm)
Nut
(mm)
A (mm)
Tightening torque
Clutch
type tool
for R32,
R410A
Clutch
type tool
for R22
Wing nut
type tool
for R22
N•m
kgf•cm
ø6.35
(1/4”)
17
0 to 0.5
1.0 to 1.5
1.5 to 2.0
13.7 to 17.7 140 to 180
ø9.52
(3/8”)
22
34.3 to 41.2 350 to 420
ø12.7
(1/2”)
26
2.0 to 2.5
49.0 to 56.4 500 to 575
ø15.88
(5/8”)
29
73.5 to 78.4 750 to 800
Tilted Uneven Burred
Good
No good
Burr
Copper pipe
Spare reamer
Pipe cutter
Smooth all
around
Even length
all around
Inside is shin-
ing without any
scratches.
Flare nut
Die
Copper pipe
Clutch type
Flaring tool
Wing nut type
Copper
pipe
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)
• Aim the copper pipe downward while removing burrs to prevent burrs
from dropping in the pipe.
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 selected.
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.
3-3. PIPE CONNECTION
• The connected pipe size differs depending the models and the capacities
of indoor units.
Indoor unit capacity
15 ~ 42
50
Liquid pipe size
ø6.35
ø6.35
Gas pipe size
Indoor unit: MSZ
ø9.52
ø9.52 *1
Indoor unit: other
ø9.52
ø12.7
*1 Use a joint pipe if the connection of the indoor unit differs.
• Use tightening torque table above as a guideline for indoor unit side union
joint section, and tighten using two wrenches. Excessive tightening dam-
ages the flare section.
1) Apply a thin coat of refrigeration oil (G) to the flared ends of the pipes and
the pipe connections of the outdoor unit.
2) For connection, first align the center, then tighten the first 3 to 4 turns of
flare nut, by hand.
3) Tighten the flare nut with a torque wrench as specified in the table.
• Over-tightening may cause damage to the flare nut, resulting in refrigerant
leakage.
• Be sure to wrap insulation around the piping. Direct contact with the bare
piping may result in burns or frostbite.
3-4. 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 (E), apply taping starting from the entry of outdoor unit.
• Stop the end of piping tape (E) with tape (with adhesive agent attached).
• 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.
WARNING
When installing the unit, securely connect the refrigerant pipes
before starting the compressor.
CAUTION
When there are the ports which are not used, make sure their
nuts are tightened securely.
WARNING
To avoid risk of fire, flare connection should be installed out
-
doors. Reusable mechanical connectors and flared joints are
not allowed indoors.
When connecting the refrigerant piping by brazing, rether than
using flare connections, complete all brazing prior to connecting
indoor unit to outdoor unit.
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