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2. CONNECTION PIPES
When the flare nut is tightened properly by your hand, hold the
body side coupling with a separate spanner, then tighten with a
torque wrench (Fig. 8, Table 5).
Fig. 7
Indoor unit
Table 5: Flare nut tightening torque
Flare nut
Liquid pipe (ø6.35 mm)
Gas pipe (ø9.53 mm)
Gas pipe (ø12.7 mm)
Gas pipe (ø15.88 mm)
1 Be sure to apply the pipe against the port on the indoor unit correctly. If the centering is improper, the flare
nut cannot be tightened smoothly. If the flare nut is forced to turn, the threads will be damaged.
2 Do not remove the flare nut from the indoor unit pipe until immediately before connecting the connection
pipe.
3 Hold the torque wrench at its grip, keeping it in the right angle with the pipe as shown in Fig. 8, in order to
tighten the flare nut correctly.
5. INSTALLING THE COUPLER HEAT INSULATION
After checking for gas leaks, insulate by the coupler heat insulation around the gas pipe and liquid pipe of the indoor unit.
Fig. 9
Body
CAUTION
Must fit tightly against body without any gap.
Liquid pipe
Gas pipe
Tightening Torque
150 to 220 kgf·cm (14.7 to 19.6 N·m)
310 to 350 kgf·cm (30.4 to 34.3 N·m)
500 to 550 kgf·cm (49.0 to 53.3 N·m)
750 to 800 kgf·cm (73.5 to 78.4 N·m)
Coupler heat
insulation
Be sure to overlap
the insulation
Fig. 8
Holding spanner
Body side
CAUTION
Torque wrench
No gap
Coupler heat insulation
En-5
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