Daikin RZQ140B7W1B [55/326] Too high tightening force may cause refrigerant leak because of flare cracking

Daikin RZQ71B8V3B [55/326] Too high tightening force may cause refrigerant leak because of flare cracking
ESIE05-03 Functional Diagrams
Part 1 System Outline 1–33
3
1
4
5
Caution for flare
connections
P Refer to below table for correct flare dimensions and tightening torques. Too high tightening force
may cause refrigerant leak because of flare cracking:
P When connecting the flare nut, apply refrigerating machine oil to the flare (inside and outside) and
first screw the nut 3 or 4 turns by hand. Coat the indicated surfaces using ether or ester oil:
P After completing the installation, carry out an inspection of the piping connections by pressure test
using nitrogen.
Piping size
Flare nut
tightening torque
A dimensions for
processing flares (mm)
Flare shape
Ø 6.4
14.2~17.2 N·m
(144~176 kgf·cm)
8.7~9.1
Ø 9.5
32.7~39.9 N·m
(333~407 kgf·cm)
12.8~13.2
Ø 12.7
49.5~60.3 N·m
(504~616 kgf·cm)
16.2~16.6
Ø 15.9
61.8~75.4 N·m
(630~770 kgf·cm)
19.3~19.7
Ø 19.1
97.2~118.6 N·m
(989.8~1208 kgf·cm)
23.6~24.0
R=0.4~0.
8
45°
±
2
90°
±0.5
A
ESIE05-03.book Page 33 Wednesday, April 6, 2005 4:09 PM

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