PMGB0406B rev.1
48
Do not apply the
refrigerant oil to the
outside of the
À
ared
opening.
Apply Refrigerant Oil.
(6) Wherever buried piping exists on site, make sure there is adequate access to inspect piping sockets
and elbows, and for interconnecting parts.
(7) Piping must be reinforced to not be damaged by an external force.
(8) Make sure that the piping can accommodate expansion and contraction.
(9) Prevent the pipes from touching walls, ceiling, etc.
(10) Test for air-tight integrity. This should be done in accordance with the "Installation and Maintenance
Manual" for the outdoor unit.
(11) If temperature and humidity inside the room exceed 80.6°F (27°C)/RH80%, condensation occurs on
the surface of the insulation (
¿
eld-supplied). Wrap additional insulation (approximately 3/16~3/8 inch
(5~10mm) thickness) around the insulation (
¿
eld-supplied) of the refrigerant pipe as a preventive
measure.
(12) Insulate each
À
are connection without gap with insulations (
¿
eld-supplied) to prevent condensation.
Insulate each refrigerant pipe as well.
(13) Insulate piping between the expansion valve box and air handler with insulation (
¿
eld supplied).
Fasten with cable clamps
at three locations along the pipe
(Field-Supplied).
Affix vinyl tape position at the vertical part
(Insulation for Refrigerant Pipe (Field-Supplied)).
Securely fasten cable clamps and vinyl tape
in order to prevent the accumulation of moisture.
Expansion Valve Box
Side
Check for any gap between
the indoor unit and the insulation.
Insulation Material
(Field-Supplied)
Insulation for
Refrigerant Pipe
(Field-Supplied)
Refrigerant Pipe
(Field-Supplied)
Ɣ
Do not apply excessive force to the
À
are nut when tightening. The
À
are nut may crack due to stress
fracture and refrigerant leakage may occur. Use the correct torque speci
¿
cations.
Ɣ
Make sure that a refrigerant leak test has been performed. Refrigerant (
À
uorocarbon) for this unit
is non-
À
ammable, non-toxic, and odorless. If the refrigerant should escape and come into contact
with
À
ame, toxic gas will form. This gas is heavier than air and will settle near
À
oor areas and spread
where it can cause asphyxiation to people.
Figure 22. Applying Refrigerant Oil
Figure 23. Insulating Piping
Required Tightening Torque (JIS B 8607)
Pipe Size
Tightening Torque
3/8 inch (9.52 mm)
25.1-31.0 ft.lbs (34-42 N.m)
(Ins)DX-Kit̲4e-rev1.indd 48
(Ins)DX-Kit̲4e-rev1.indd 48
2016/11/25 15:32:55
2016/11/25 15:32:55