89
ENGLISH
Pipe insulation
Insulating the refrigerant pipes and branch joints
Check for gas leakage before completing (the hose and pipe insulation) and if there is no sign of leakage,
make sure to insulate the pipes and hoses.
Use EPDM material insulator that meets the following conditions.
Test item Unit Standard
Density g/cm
3
ߢߢߦߪߢߢ߫ߨ
Dimensional change rate by heat % Below -5
Absorption rate g/cm
3
Below 0.005
Thermal conduction rate W/m·K Below 0.037
Moisture transpiration factor ng/(m
2
·s·Pa) Below 15
Moisture transpiration grade g/(m
2
·24h) Below 15
Formaldehyde dispersion mg/L There should be none
Oxygen rate % Over 25
Selecting the refrigerant pipe insulator
Insulate the gas pipe and liquid pipe by referring to the thickness of insulator for each pipe size.
Ɵ˵ʪϑϩɇʒɇθʒʀͱʒϩͱϑࢨϩʪΧʪθɇϩЇθʪɇϩߥߢঌAࡥ˵Їʒϩцʪϑϑϩ˵ɇߪߧÃ˙ʀɇϑʪ˙ϩ˵ʪ˵Їʒϩцϑ˵˝˵ʪθࡥ
you must increase the size by one grade as stated in below table.
Pipe
Diameter of
refrigerant pipe
Insulator (Cooling·Heating)
Remarks
General
[30 °C, 85 %]
High humidity
[30 °C, over 85 %]
kťUđࡥĘ9ŵ
Liquid pipe
ŝߨߥߧŝ߫ߧߤ 9 mm
Heat resisting
temperature over
ߣߤߢঌA
ŝߣߤߩŝߧߢߪߢ 13 mm
Gas pipe
Ø 6.35 13 mm 19 mm
ŝ߫ߧߤŝߤߧߦߢ
19 mm
25 mm
ŝߤߪߧߪŝߦߦߦߧ 32 mm
Ø 50.80 25 mm 38 mm
࢜
When installing insulation in places and conditions below, use the same insulation that is used for high
humidity conditions.
<Geological condition>
ৄ High humidity places such as shoreline, hot spring, near lake or river, and ridge (when the part of the
building is covered by earth and sand.)
<Operation purpose condition>
ৄ Restaurant ceiling, sauna, swimming pool etc.
<Building construction condition>
ৄ The ceiling frequently exposed to moisture and cooling is not covered. (e.g. The pipe installed at a
corridor of a dormitory and studio or near an exit that opens and closes frequently.”)
ৄ The place where the pipe is installed is highly humid due to the lack of ventilation system.
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