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5. Installing the refrigerant piping
Fig. 5-4
45°± 2°
A
Flare cutting dimensions
B
Flare nut tightening torque
Fig. 5-5
A (Fig. 5-5)
Copper pipe O.D.
(mm) (inch)
ø6.35 (1/4)
ø9.52 (3/8)
ø12.7 (1/2)
ø15.88 (5/8)
Copper pipe O.D.
Flare nut O.D.
(mm) (inch)
(mm) (inch)
ø6.35 (1/4)
17 (11/16)
ø6.35 (1/4)
22 (7/8)
ø9.52 (3/8)
22 (7/8)
ø9.52 (3/8)
26 (1-1/4)
ø12.7 (1/2)
26 (1-1/4)
ø12.7 (1/2)
29 (1-1/8)
ø15.88 (5/8)
29 (1-1/8)
ø15.88 (5/8)
36 (1-7/16)
Fig. 5-6
8
A Liquid pipe
B Gas pipe
C Insulation
D Taping
Flare dimensions
øA dimensions (mm) (inch)
8.7 - 9.1 (5/16 - 3/8)
12.8 - 13.2 (1/2)
16.2 - 16.6 (5/8)
19.3 - 19.7 (3/4)
Tightening torque
14 - 18 (10 - 13)
34 - 42 (25 - 30)
34 - 42 (25 - 30)
49 - 61 (35-44)
49 - 61 (35-44)
68 - 82 (49 - 59)
68 - 82 (49 - 59)
100 - 120 (71 - 87)
10 kgf·cm
A
A Die
B Copper pipe
Warning:
When pumping down the refrigerant, stop the compressor before disconnect-
ing the refrigerant pipes. The compressor may burst and cause injury if any
foreign substance, such as air, enters the system.
ping from the refrigerant piping. (liquid pipe/gas pipe)
installed, or condensation may occur on the surface of the insulation material.
(Insulation material Heat-resistant temperature: 120 °C, 248 °F, Thickness:
15 mm, 5/8 inch or more)
* When the refrigerant piping is used in locations subject to high tempera-
ture and humidity such as in the attic, further addition of insulation may be
required.
the indoor unit and insulation material as well as to the net between the insulation
(Condensation forming on the piping may result in condensation in the room or
burns when contacting the piping.)
[Fig. 5-5]
A
completed.
D
Warning:
When installing the unit, securely connect the refrigerant pipes before starting
the compressor.
Pipe size
Liquid
ø9.52 (3/8)
The lineup of a connectable indoor unit
(ømm) (inch)
depends on a district/areas/country.
Gas
ø15.88 (5/8)
Indoor unit type
(BTU/h)
06
ø6.35
Liquid
(1/4)
Pipe size
(ømm) (inch)
ø9.52
Gas
(3/8)
Indoor unit type
(BTU/h)
12
ø6.35
Liquid
(1/4)
Pipe size
(ømm) (inch)
ø12.7
Gas
(1/2)
may result.
1 Pipes must be connected starting from the indoor unit.
Flare nuts must be tightened with a torque wrench.
2 Flare the liquid pipes and gas pipes and apply a thin layer of refrigeration oil (Ap-
plied on site).
pipes.
Caution:
piping may result in burns or frostbite.
)
Copper pipe O.D.
Flare tool for R410A
ø6.35 (1/4)
0 - 0.5 (0 - 1/64)
ø9.52 (3/8)
0 - 0.5 (0 - 1/64)
ø12.7 (1/2)
0 - 0.5 (0 - 1/64)
ø15.88 (5/8)
0 - 0.5 (0 - 1/64)
-
B
C
09
12
15
18
24
ø6.35
ø6.35
ø6.35
ø6.35
ø9.52
(1/4)
(1/4)
(1/4)
(1/4)
(3/8)
ø9.52
ø9.52
ø12.7
ø12.7
ø15.88
(3/8)
(3/8)
(1/2)
(1/2)
(5/8)
18
24
30
36
ø6.35
ø9.52
ø9.52
ø9.52
(1/4)
(3/8)
(3/8)
(3/8)
ø12.7
ø15.88
ø15.88
ø15.88
(1/2)
(5/8)
(5/8)
(5/8)
mm (inch)
A
Flare tool for R22·R407C
Clutch type
1.0 - 1.5 (3/64 - 1/16)
1.0 - 1.5 (3/64 - 1/16)
1.0 - 1.5 (3/64 - 1/16)
1.0 - 1.5 (3/64 - 1/16)
-
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