Toshiba RAS-07EK Service Manual page 11

(3) The radius of the pipe bend should be 100 mm or
more.
Fig. 3-20
(4) Too small a radius causes collapse of pipe.
Fig. 3-21
3-3-2. Pipe Connection
(1) Connect the flare pipe close to the air conditioner
unit so both faces fit well.
Note:
• Forcing to tighten the nut without the center axis
coincided causes gas leaks.
Fig. 3-22
(2) Use a torque wrench and spanner to tighten or
untighten the flare nut. Tightening should be done
by finger first, then use the torque wrench. A
torque wrench helps to provide adequate torque
for tightening.
Fig. 3-23
Note:
• Insufficient tightening causes gas leaks. Over
tightening results in cracks the flared surface.
CAUTION:
• Do not use the spanner from the beginning of
tightening.
• When processing 1/4 inch pipe, tighten lightly
with spanner and then tighten additionally by
90 – 120 degree with torque wrench and span-
ner.
Table 3-2 Tightening torque of flare nut
Pipe size
Standard
torque
– 11 –
6.35 mm (1.4") 9.52 mm (3/8")
15.7 (160) 29.4 (300)
Fig. 3-24
Fig. 3-25