Installation Manual
Table Of Contents
En-15
English
5.4. Installing insulation
CAUTION
Install heat insulation around both the gas and liquid pipes. Failure to do so may cause water leaks.
Use heat insulation with heat resistance above 120 °C (248 °F). (Reverse cycle model only)
In addition, if the humidity level at the installation location of the refrigerant piping is expected to exceed 70%, install heat
insulation around the refrigerant piping. If the expected humidity level is 70-80%, use heat insulation that is 15 mm (19/32 in.)
or thicker and if the expected humidity exceeds 80%, use heat insulation that is 20 mm (25/32 in.) or thicker.
If heat insulation is used that is not as thick as specifi ed, condensation may form on the surface of the insulation. In addition,
at 20 °C (68 °F), use heat insulation with heat conductivity of 0.045 W/(m·K) or less.
5.4.1. Piping insulation
(1) Install the coupler heat insulation (large and small) and insulation (long and short) on each pipe as shown in the fi gures
below.
(2) Attach the butting surface with no gap to eliminate any gap between the insulations.
(3) During the pipe insulation work, prevent air from getting inside the insulation with an adhesive tape (fi eld supply).
(A) Indoor unit side
Coupler heat insulation (large)
Butting surfaces
Coupler heat insulation (small)
Adhesive tape (fi eld supply)
Insulation (long)
Adhesive tape (fi eld supply)
Adhesive tape (fi eld supply)
(B) Outdoor unit side
Coupler heat insulation (small)
Coupler heat insulation (large)
Butting surfaces
Insulation (short)
Adhesive tape
(fi eld supply)
Insulation (short)
Insulation (short)
Insulation (short) x 2
(cover with 2 pieces of
insulation)
[First piece]
[Second piece]
5.4.2. Non-connecting pipes
(1) Install the coupler heat insulation (large and small) and
insulation (long) as shown in the fi gure on the right.
(2) Apply an adhesive tape (fi eld supply) to prevent air from
getting inside the insulation.
Insulation (long)
Adhesive tape (fi eld supply)
Adhesive tape (fi eld supply)
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