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ENGLISH
Pipe insulation
Insulating the refrigerant pipes and branch joints
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.
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
f Insulate the gas pipe and liquid pipe by referring to the thickness of insulator for each pipe size.
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
Outer diameter
Insulator (Cooling)
Remarks
General
[ 30ºC (86ºF), 85% ]
High humidity
[ 30ºC (86ºF), over 85% ]
EPDM, NBR
mm inch mm inch mm inch
Liquid pipe
6.35~9.52 1/4~3/8 9 3/8 9 3/8
Heating resisting
temperature over
120°C(248°F)
12.7~50.8 1/2~2 13 1/2 13 1/2
Gas pipe
6.35 1/4 13 1/2 19 3/4
9.52~25.4 3/8~1 19 3/4 25 1
28.58~44.45 1 1/8~1 3/4 19 3/4 32 1 1/4
50.8 2 25 1 38 1 1/2
❋ 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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