- 27 -
fi g. 30 - Flaring of the fl are connections
Flaring tool
Pipe
Nut
fl are
B
L
C
ø Pipe
Dimensions in mm
L B 0/-0.4 C
6.35 (1/4") 1.8 to 2 9.1 17
9.52 (3/8") 2.5 to 2.7 13.2 22
12.7 (1/2") 2.6 to 2.9 16.6 26
15.88 (5/8") 2.9 to 3.1 19.7 29
►
Shaping the refrigeration pipes
▼
Bending
The refrigeration pipes must be shaped only on a
bending machine or with a bending spring in order to
avoid any risk of crushing or breaking them.
Remove the insulation material from the section of
pipe to be bent.
Do not bend copper to an angle greater than 90°.
The radius of curvature must be more than
2.5x ø pipe.
Never bend pipes more than 3 times in the same
place otherwise traces of fracturing may appear
(hardening of the metal).
▼
Creating the fl arings
- Cut the pipe to an appropriate length with a pipe-cutter
without damaging it.
- Carefully deburr it, holding the pipe pointing downward
to avoid introducing fi lings into the pipe.
- Remove the fl ared connection nut situated on the
valve to be connected and slide the pipe into the nut.
- Proceed to fl are it, letting the pipe protrude out of the
fl aring tool's tube.
- After fl aring, check the state of the working radius (L).
This must not present any scratches or signs of
fracturing. Also check the dimension (B).
90°
fi g. 31 - Tightening torques
Designation Tightening torque
Flared nut 6.35 mm (1/4") 16 to 18 Nm
Flared nut 9.52 mm (3/8") 32 to 42 Nm
Flared nut 12.7 mm (1/2") 49 to 61 Nm
Flared nut 15.88 mm (5/8") 63 to 75 Nm
Plug (A) 3/8", 1/4" 20 to 25 Nm
Plug (A) 1/2" 28 to 32 Nm
Plug (A) 5/8" 30 to 35 Nm
Plug (B) 3/8", 5/8", 1/2", 1/4" 12.5 to 16 Nm
Plug (A) & (B) : see
fi g. 22, page 25.
Holding spanner
Torque wrench
Waterstage Split Comfort DHW Serie / INSTALLATION / 2125 - EN
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