10
A
Flare cutting dimensions
B
Flare nut tightening torque
A
Die
B
Copper pipe
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A
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A
(Fig. 4-5)
B
(Fig. 4-5)
90°± 0.5°
øA
45°± 2°
55
Copper pipe O.D.
(mm)
Flare dimensions
øA dimensions (mm)
ø6.35
ø9.52
ø12.7
16.2 - 16.6
¡
19.3 - 19.7
Copper pipe O.D.
(mm)
Flare nut O.D.
(mm)
Tightening torque
1āP
ø6.35
17
ø6.35
22
34 - 42
ø9.52
22
34 - 42
ø12.7
26
49 - 61
ø12.7
29
¡
29
¡
36
100 - 120
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Fig. 4-1 is a sample of piping system.
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is installed, or condensation may occur on the surface of the insulation material.
(Insulation material Heat-resistant temperature: 120 °C, Thickness: 15 mm or more)
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humidity such as in the attic, further addition of insulation may be required.
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the indoor unit and insulation material as well as to the net between the insulation
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(Condensation forming on the piping may result in condensation in the room or
burns when contacting the piping.)
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A
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B
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completed.
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C
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D
When bending the pipes, be careful not to break them. Bend radius of 100 mm to
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Make sure the pipes do not contact the compressor. Abnormal noise or vibration
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).
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pipes.
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Table 3 (Fig. 4-6)
Copper pipe O.D. (mm)
A (mm)
Flare tool for R410A
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Clutch type
ø6.35
0 - 0.5
1.0 - 1.5
ø9.52
0 - 0.5
1.0 - 1.5
ø12.7
0 - 0.5
1.0 - 1.5
¡
0 - 0.5
1.0 - 1.5
ø19.05
0 - 0.5
1.0 - 1.5
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Remove the service panel
D
(three screws) and the front piping cover
A
(two screws)
and rear piping cover
B
(two screws).
1
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unit’s stop valve is completely closed.
2
Vacuum-purge air from the indoor unit and the connection piping.
3
After connecting the refrigerant pipes, check the connected pipes and the indoor
unit for gas leaks. (Refer to 4.6. Refrigerant pipe airtight testing method)
4
Vacuumize the refrigerant lines through the service port of the liquid and gas stop
valves. And then open the stop valves completely (for both the liquid and gas stop
valves). This will completely connect the refrigerant lines of the indoor and outdoor
units.
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control valves will be damaged.
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-
tion sections of the outdoor unit.
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Failure to replace and tighten the caps may result in refrigerant leakage. In
addition, do not damage the insides of the valve caps as they act as a seal to
prevent refrigerant leakage.
5
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sections to prevent water from entering the thermal insulation.
A
Front piping cover
B
Piping cover
C
Stop valve
D
Service panel
E
Bend radius : 100 mm - 150 mm
B
C
E
A
D
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