28-EN
27-EN
– 14 –
EN
Refrigerant pipe length
Single
Allowable pipe length (m)
Height difference (Indoor-outdoor H) (m)
Total length L
Indoor unit: Upper
Outdoor unit: Lower
30
30
30
Pipe diameter (mm)
Number of bent portions
Gas side
Liquid side
Ø15.9
Ø9.5
10 or less
L
H
Indoor unit
Outdoor unit
Tightening of connecting part
1
Align the centers of the connecting pipes
and fully tighten the
fl
are nut with your
fi
ngers. Then
fi
x the nut with a wrench as
shown in the
fi
gure and tighten it with a
torque wrench.
Half union or packed valve
Flare nut
Internally
threaded side
Externally
threaded side
Fix with wrench.
Tighten with torque
wrench.
2
As shown in the
fi
gure, be sure to use two
wrenches to loosen or tighten the
fl
are nut
of the valve on the gas side. If you use a
single crescent, the
fl
are nut cannot be
tightened to the required tightening torque.
On the other hand, use a single crescent to
loosen or tighten the
fl
are nut of the valve on the
liquid side.
(Unit: N•m)
Outer dia. of copper pipe
Tightening torque
9.5 mm (dia.)
34 to 42 (3.4 to 4.2 kgf•m)
15.9 mm (dia.)
63 to 77 (6.3 to 7.7 kgf•m)
Loosened
Cap
Tightened
Flare nut
CAUTION
y
Do not put the crescent wrench on the cap or
cover. The valve may break.
y
If applying excessive torque, the nut may break
according to some installation conditions.
Incorrect
Cap
Flare nut
• After the installation work, be sure to check for gas
leaks of the pipe connections with nitrogen.
• Therefore, using a torque wrench, tighten the
fl
are
pipe connecting sections that connect the indoor/
outdoor units at the speci
fi
ed tightening torque.
Incomplete connections may cause not only a gas
leak, but also trouble with the refrigeration cycle.
Do not apply refrigerating machine oil to the
fl
ared surface.
