14
Performing leak test & insulation
5. Select the insulation of the refrigerant pipe.
t Insulate the gas side and liquid side pipe referring to the thickness according to the pipe size.
t Indoor temperature of 86 °F(30 °C) and humidity of 85% is the standard condition.If install in a high humidity condition,use
one grade thicker insulator by referring to the table below.If installing in an unfavorable conditions, use a thicker wall
insulation.
t Insulator’s heat-resistance temperature should be more than 248 °F (120 °C).
Pipe
Outer diameter
Insulation Type (Cooling/Heating)
Remarks
General [30°C (86°F),
85% or below]
High humidity [30°C
(86°F), more than 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
Internal
temperature
is higher than
248 °F (120 °C)
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
t 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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