P5417050-rev.1
17
Required Tightening Torque
(JIS B 8607)
Pipe Size
Tightening Torque
1/4 inch (6.35 mm)
10.3 - 13.3 ft·lbs (14 - 18 N·m)
3/8 inch (9.52 mm)
25.1 - 31.0 ft·lbs (34 - 42 N·m)
1/2 inch (12.7 mm)
36.1 - 45.0 ft·lbs (49 - 61 N·m)
5/8 inch (15.88 mm) 50.2 - 60.5 ft·lbs (68 - 82 N·m)
5. Wherever buried piping exists on site, make sure there is a service doorway to provide adequate access
to inspect piping sockets and elbows, and for interconnecting parts.
6. Suspend pipes at certain points and reinforce against earthquakes so that they are not damaged by
an external force. Appropriate measures should be taken during installation to guard against possible
damage or injury that might occur in an earthquake. Check local codes and regulations and refer to the
Safety Section in this manual for information.
7. Do not secure refrigerant piping too tightly in order to accommodate expansion and contraction.
8. Prevent the pipes from contacting weak portions such as a wall or a ceiling. (Otherwise, abnormal
sound may be heard due to vibration of the piping.)
9. Leak test all piping and connections. The procedures should be performed in accordance with the
"Installation and Maintenance Manual" for the outdoor unit.
10. If temperature and humidity inside the ceiling exceed 86°F (30°C)/RH80%, condensation occurs on
the surface of the accessory insulation. Wrap additional insulation of approximately 1/4 to 7/16 inch (5
to10mm) thickness around the accessory insulation of the refrigerant pipe as a preventive measure.
11. Insulate each flare connection without gaps with accessory insulations to prevent condensation. Then
insulate each refrigerant pipe as well.
Fasten with cable bands
at three locations along the pipe
(Accessory).
Secure the vinyl tape position at the vertical part
(Insulation for Refrigerant Pipe (Accessory)).
Securely fasten cable bands and the vinyl tape
in order to prevent the accumulation of moisture.
Unit
Side
Insulation Material
(Factory-Supplied)
Insulation for
Refrigerant Pipe
(Field-Supplied)
Refrigerant Pipe
(Field-Supplied)
Check for any gaps between
the indoor unit and the insulation.
● Do not apply excessive force to the flare nut when tightening. If applied, the flare nut may crack due
to stress fracture and refrigerant leakage may occur. Use the correct torque specifications.
● Make sure that a refrigerant leak test has been performed. Refrigerant (fluorocarbon) for this unit is
non-flammable, non-toxic, and odorless. If the refrigerant should somehow escape and come into
contact with flame, toxic gas
will
form. This gas is heavier than air and will settle near floor areas
and spread where it can cause asphyxiation to those nearby.
2. Use the specific flare nut included with the unit.
3. Verify that there are no scratches or burrs stuck to internal surfaces, or surface deformations at the
flared opening.
4. Before tightening the flare nut, apply refrigerant oil (field-supplied) in a thin layer over the flared face. (Do
not apply the oil on other areas.) Tighten the flare nut for the liquid pipe to the specified torque with two
wrenches. Then, tighten the flare face for the gas piping in the same way. After the tightening work has
been completed, check that no refrigerant leakage occurs.
NOTES:
1. Refrigerant oil is field-supplied.
[Ethereal Oil FVC50K, FVC68D (Idemitsu Kousan Co. Ltd.)]
2. If refrigerant comes into contact with decorative panel surfaces, damage in the form of cracks can occur on
panel surfaces. Use with caution.
Do not apply the
refrigerant oil to
the outside of
the flare face.
Apply Refrigerant Oil.
