8
Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
3-3. PIPE CONNECTION
• The connected pipe size differs depending the models and the capacities of indoor units.
Tilted Uneven Burred
Good
No good
Burr
Copper pipe
Spare reamer
Pipe cutter
Smooth all
around
Even length
all around
Inside is shining
without any
scratches.
Flare nut
Die
Copper pipe
Clutch type
Flaring tool
Wing nut type
1) Apply a thin coat of refrigeration oil (G) to the flared ends of the pipes and the pipe connec
-
tions of the outdoor unit. Do not apply refrigeration oil on screw threads. Excessive tightening
torque will result in damage on the screw.
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 condensa-
tion.
Copper
pipe
WARNING
When installing the unit, securely con-
nect the refrigerant pipes before starting
the compressor.
CAUTION
When there are the ports which are not
used, make sure their nuts are tightened
securely.
3. FLARING WORK AND PIPE CONNECTION
3-1. PRECAUTIONS FOR DEVICES THAT USE R32 REFRIGERANT
• Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration oil applied to the flared sections.
• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses specified
in the table to the below. Make sure the insides of the pipes are clean and do not contain any harmful contaminants such as sulfuric compounds, oxidants, debris,
or dust.
Always apply no-oxidation brazing when brazing the pipes, otherwise, the compressor will be damaged.
WARNING:
When installing or relocating, or servicing the air conditioner, use only the specified refrigerant (R32) to charge the refrigerant lines. Do not mix it with any
other refrigerant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the cause of abnormal high pressure in the refrigerant line, and may result in an explosion and other
hazards.
The use of any refrigerant other than that specified for the system will cause mechanical failure or system malfunction or unit breakdown. In the worst case,
this could lead to a serious impediment to securing product safety.
Pipe size (mm)
ø6.35 ø9.52 ø12.7 ø15.88 ø19.05 ø22.2 ø25.4 ø28.58
Thickness (mm)
0.8
0.8
0.8
1.0
1.0
1.0
1.0
1.0
• Do not use pipes thinner than those specified above.
• Use 1/2 H or H pipes if the diameter is 19.05 mm or larger.
• Be sure to have appropriate ventilation in order to prevent ignition. Furthermore, be sure to carry out fire prevention measures that there are no dangerous or flam
-
mable objects in the surrounding area.
*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 damages the flare section.
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
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.
Indoor unit capacity
15 ~ 25 35 ~ 42
50
60
71
Indoor unit:
M series
Liquid pipe size
ø6.35
ø6.35
ø6.35
ø6.35
ø6.35
Gas pipe size
ø9.52
ø9.52
ø9.52 *1
ø12.7
ø12.7
Indoor unit:
S series
Liquid pipe size
ø6.35
ø6.35
ø6.35
ø6.35
ø9.52
Gas pipe size
ø9.52
ø9.52
ø12.7
ø15.88
ø15.88
Indoor unit:
P series
Liquid pipe size
-
ø6.35
ø6.35
ø9.52
ø9.52
Gas pipe size
-
ø12.7
ø12.7
ø15.88
ø15.88
WARNING
To avoid risk of fire, flare connection should be installed
outdoors. 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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