Installation Procedure
34
English
Installation manual
CAUTION
• Must fit tightly against body without any gap.
• Make sure that all refrigerant connection must be
accessible for easy maintenance and detachment.
• Install the insulation not to get wider and use the
adhesives on the connection part of it to prevent
moisture from entering.
• Wind the refrigerant pipe with insulation tape if it is
exposed to outside sunlight.
• Install the refrigerant pipe respecting that the insulation
does not get thinner on the bent part or hanger of pipe.
• Add the additional insulation if the insulation plate gets
thinner.
• All refrigerant connection must be accessible, in order
to permit eithernit maintenance or removal.
Additional insulation
Hanger
Refrigerant pipe insulation
a
a x 3
5 Select the insulation of the refrigerant pipe.
• Insulate the gas side and liquid side pipe, noting the
insulation thickness that must differ according to
the pipe size.
• Standard: Less than an indoor temperature of 30°C,
with humidity at 85%. If installing in a high humidity
environment, use one grade thicker insulator by
referring to the table below. If installing in an
unfavourable environment, use thicker one.
• The heat-resistance temperature of the insulator
must be more than 120°C.
Pipe
Pipe size
(mm)
Insulation Type
(Heating/Cooling)
Remarks
Standard
[30°C,
85%]
High
humidity
[30°C,
over 85%]
EPDM, NBR
Liquid pipe
Ø6.35 to
Ø9.52
9t
Internal
temperature
is higher than
120°C
Ø12.7 to
Ø50.80
13t
Gas pipe
Ø6.35 13t 19t
Ø9.52 to
Ø25.40
19t
25t
Ø28.58 to
Ø44.45
32t
Ø50.80 25t 38t
• When installing insulation in the places and
conditions below, use the same insulation that is
used for high humidity conditions.
<Geological condition>
High humidity locations such as shorelines, hot springs, lake
or riversides, and ridges (when part of the building is covered
by earth and sand)
<Operation purpose condition>
Restaurant ceiling, sauna, swimming pool etc.
<Building construction condition>
Ceilings frequently exposed to moisture and cooling are
not covered. For example, pipes installed at a corridor of a
dormitory and studio or near an exit that opens and closes
frequently.
Places (where the pipes are installed) that are highly humid
due to a lack of ventilation.
• Refrigerant pipe before EEV kit and MCU or without
EEV kit and MCU
– You can contact the gas side and liquid side
pipes but the pipes should not be pressed.
– When contacting the gas side and liquid side
pipe, use 1 grade thicker insulator.
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