89
ENGLISH
Pipe insulation
Insulating the refrigerant pipes and branch joints
ॷ
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.
ॷ
Use EPDM material insulator that meets the following conditions.
Test item
Unit
Standard
Density
g/cm
3
ߢߢߦߪड़ߢߢ߫ߨ
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
ॷ
Insulate the gas pipe and liquid pipe by referring to the thickness of insulator for each pipe size.
ॷ Ɵ˵ʪϑϩɇ͝ʒɇθʒʀͱ͝ʒ̈ϩ̈ͱ̈͝ϑࢨϩʪ͔ΧʪθɇϩЇθʪɇϩߥߢঌAࡥ˵Ї͔̈ʒ̈ϩц̷ʪϑϑϩ˵ɇ͝ߪߧ१Ã˙ʀɇϑʪ̈˙ϩ˵ʪ˵Ї͔̈ʒ̈ϩц̈ϑ˵̈˝˵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 %]
kťUđࡥऌĘ9ŵ
Liquid pipe
ŝߨߥߧड़ŝ߫ߧߤ
9 mm
ॱ
Heat resisting
temperature over
ߣߤߢঌA
ŝߣߤߩड़ŝߧߢߪߢ
13 mm
ॱ
Gas pipe
Ø 6.35
13 mm
19 mm
ŝ߫ߧߤड़ŝߤߧߦߢ
19 mm
25 mm
ŝߤߪߧߪड़ŝߦߦߦߧ
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.
