Refrigerant Piping Connection; Tightening Connection - Toshiba RAS-B24B2KVG-E Installation Manual

Refrigerant Piping Connection

Flaring
1. Cut the pipe with a pipe cutter.
90
2. Insert a fl are nut into the pipe and fl are the pipe.
• Projection margin in fl aring : A (Unit : mm)
RIDGID (clutch type)
Outer dia.
R32 tool used
of copper pipe
Ø6.35
Ø9.52
Ø12.70
Pipes thickness
IMPERIAL (wing nut type)
A
Outer dia. of copper pipe
Die
Pipe
CAUTION
• Do not scratch the inner surface of the fl ared part when removing burrs.
• Flare processing under the condition of scratches on the inner surface
of fare processing part will cause refrigerant gas leak.
Obliquity Roughness
Conventional tool
used
0 to 0.5 1.0 to 1.5
0 to 0.5 1.0 to 1.5
0 to 0.5 1.0 to 1.5
0.8 mm or more
Ø6.35 1.5 to 2.0
Ø9.52 1.5 to 2.0
Ø12.70 2.0 to 2.5
Pipes thickness 0.8 mm or more

Tightening connection

Align the centers of the connecting pipes and tighten the fl are nut as far as
possible with your fi ngers. Then tighten the nut with a spanner and torque
wrench as shown in the fi gure.
Externally
Warp
threaded side
Use a wrench to secure.
CAUTION
Do not apply excess torque. Otherwise, the nut may crack depending on
the conditions.
Outer dia. of copper pipe
R32
• Tightening torque of fl are pipe connections
The operating pressure of R32 is
higher than that of R22 (approx.
1.6 times). It is therefore necessary
to fi rmly tighten the fl are pipe
connecting sections (which connect
the indoor and outdoor units) up to the
specifi ed tightening torque. Incorrect
connections may cause not only a
gas leakage, but also damage to the
refrigeration cycle.
6
Half union
Use a torque wrench to tighten.
Ø6.35 mm 14 to 18 (1.4 to 1.8 kgf·m)
Ø9.52 mm 30 to 42 (3.0 to 4.2 kgf·m)
Ø12.70 mm 50 to 62 (5.0 to 6.2 kgf·m)
Flare nut
Internally
threaded side
(Unit : N·m)
Tightening torque
Flare at
indoor unit side
Flare at
outdoor unit side