Installation Manual
‒
23
‒
23-EN
REQUIREMENT
Tightening with an excessive torque may crack
the nut depending on installation conditions.
Tighten the nut within the specified tightening
torque.
Piping with outdoor unit
• Shape of valve differs according to the outdoor
unit.
For details of installation, refer to the Installation
Manual of the outdoor unit.
Heat insulation
Heat insulation for the pipes should be done
separately for the liquid side and gas side.
Because both of the liquid and gas side pipes
become a low temperature during cooling
operation, suf
fi
cient heat insulation should be
done to prevent condensation.
• Heat insulator with a heat resistance of 120°C or
more must be used for the gas side pipe.
• The pipe connection section of the indoor unit
must be heat insulated securely and compactly
with the attached heat insulator.
Fix with vinyl tape
Local side pipe
Heat insulator
(attached)
Airtight test/Air purge, etc.
For airtight test,air purge, addition of refrigerant,
and gas leak check, follow the Installation Manual
attached to the outdoor unit.
Open fully valves of the outdoor
unit
Open the valve of the outdoor unit fully.
A hexagonal wrench is required for opening the
valve.
For details, refer to the Installation Manual
attached to the outdoor unit.
CAUTION
• Do not scratch the inner surface of the flared
part when removing burrs.
• Flare processing under the condition of
scratches on the inner surface of flare
processing part will cause refrigerant gas
leak.
• Check that the flared part is not scratched,
deformed, stepped, or flattened, and that
there are no chips adhered or other problems,
after flare processing.
• Do not apply refrigerating machine oil to the
flare surface.
* In case of
fl
aring with the
conventional
fl
are tool, pull it out
approx. 0.5 mm more than that
for R22 to adjust to the speci
fi
ed
fl
are size. The copper pipe gauge
is useful for adjusting projection
margin size.
A
Tightening connection
CAUTION
• Do not apply excessive torque. Otherwise, the
nut may crack depending on the conditions.
(Unit: N•m)
Outer dia. of copper pipe
Tightening torque
6.4 mm (dia.)
14 to 18 (1.4 to 1.8 kgf•m)
9.5 mm (dia.)
33 to 42 (3.3 to 4.2 kgf•m)
12.7 mm (dia.)
50 to 62 (5.0 to 6.2 kgf•m)
15.9 mm (dia.)
68 to 82 (6.8 to 8.2 kgf•m)
q
Tightening torque of flare pipe connections
Incorrect connections may cause not only a gas
leak, but also a trouble of the refrigeration cycle.
Align the centres 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.
Work using double spanner
