Daikin VRV Plus Series General Information Manual page 26

Si33-003.book Page 22 Monday, June 25, 2001 9:06 AM
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.
(d) Coat the inner and outer surface of the flare with refrigerator oil (Ester or ether oil). (this ensures that
Important points
1. Burrs should be carefully removed.
2. 2 spanners should be used to grip the pipe.
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.
22
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 External diamenter of pipe d
3/8B 9.53
1/2B 12.7
5/8B 15.88
3/4B 19.05
the flare nut passes smoothly, preventing the pipe from twisting.)
Do not use SUNISO-4GS oil.
Size
(kgf-cm)
1/4(6.4φ) 144~176
3/8(9.5φ) 333~407
1/2(12.7φ) 504~616
5/8(15.9φ) 630~770
3/4(19.1φ) 990~1210
Pipe widening dimensions A
12.2~12.8
15.6~16.2
18.8~19.4
23.1~23.7
± 10%
Torque
(N-cm)
1420~1720
3270~3990
4950~6030
6180~7540
9270~11860
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SiE33-003
General Information