88
Pipe insulation
Insulating the refrigerant pipes and branch joints
X
f
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 .
X
f
Use EPDM material insulator that meets the following conditions .
Test item
Unit
Standard
Density
g/cm
3
0 .048~0 .096
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
X
f
Insulate the gas pipe and liquid pipe by referring to the thickness of insulator for each pipe size .
X
f
The standard condition is; temperature at 30°C, humidity less than 85% . If case if the humidity is higher, 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 %]
EPDM, NBR
Liquid pipe
Ø 6 .35~Ø 9 .52
9 mm
Heat resisting
temperature over
120°C
Ø 12 .7~Ø 50 .80
13 mm
Gas pipe
Ø 6 .35
13 mm
19 mm
Ø 9 .52 ~ Ø 25 .40
19 mm
25 mm
Ø 28 .58 ~ Ø 44 .45
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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