Daikin VRV II Series Design, Installation & Testing Instructions page 30

Installation
Flare Connection
(a) Stiffened pipe must always be annealed at least once prior to the flaring work.
(b) A pipe cutter must be used to cut the pipe. (A large pipe cutter must be used where the pipe has a large
(c) Set the flaring tool to make sure the flare size remains within the prescribed limits.
New Rank Compatible Flare Tool
Compared to previous refrigerants, the components of a HFC refrigerant is small. R410A also has a higher
pressure than other refrigerants. Therefore, in order to strengthen the intensity of the form and size of the
flare section used for R410A (class 2) apparatus, unlike the specification of the conventional refrigerants, it
was set up with different standards.
When carrying out flare processing, use a new rank compatible flare tool or a conventional flare tool.
Flare Gauge (Adapter Corresponding to the New Rank)
When using the later, use a flare gauge to take out the pipe from the gauge bar, adjust it, and then carry out
the flare processing.
Size from the dice surface to the copper tip (in mm)
(d) Coat the inner and outer surface of the flare with refrigerator oil (Ester or ether oil). (this ensures that the
Important points
1. Burrs should be carefully removed.
2. 2 spanners should be used to grip the flare nuts.
3. The flare nut must be inserted before starting the flaring operation.
4. The appropriate amount of torque should be used to tighten the flare nut.
Standard torques for tightening flare nut
5. Check that there is no superficial damage to the surface of the flare.
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diameter. When cutting a pipe which is too big for the pipe cutter a metal saw may be used but care
must be taken to ensure that the debris from sawing does not get into the pipe.)
Nominal diameter
Outer Wall
Name
diameter thickness
1/4 6.35 0.8
3/8 9.52 0.8
1/2 12.70 0.8
5/8 15.88 1.0
flare nut passes smoothly, preventing the pipe from twisting.)
Do not use SUNISO-4GS oil.
Size
(kgf-cm)
1/4(6.4 φ )
144~176
3/8(9.5 φ )
333~407
1/2(12.7 φ )
504~616
5/8(15.9 φ )
630~770
3/4(19.1 φ )
990~1210
External diameter of pipe d
1/4 6.35
3/8 9.52
1/2 12.7
5/8 15.88
3/4 19.05
Size
Thickness
Previous refrigerant (R22, R407C etc.)
The conventional flare tool
Clutch type
0~0.5
0~0.5
0~0.5
0~0.5
10%
±
Torque
(N-cm)
1420~1720
3270~3990
4950~6030
6180~7540
9270~11860
Pipe widening dimensions A
9.1
13.2
16.6
19.7
24.0
12mm×72mm
1.0×0.5mm Each
Flare gauge
R410A
The conventional flare tool
Clutch type
1.0~1.5
1.0~1.5
1.0~1.5
1.0~1.5
General Information
Si39-303