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Performing leak test & insulation
5. Select the insulation of the refrigerant pipe.
Insulate the gas side and liquid side pipe. Thickness is selected according to pipe size.
Indoor temperature of 30°C (86°F) and humidity of 85% is the standard condition. If installing in a high humidity
condition, increase insulation by one size by referring to the table below. If installing in unfavorable conditions, use
the thicker size noted.
Insulator’s heat-resistance temperature should be more than 120°C (248°F).
Pipe
Pipe size
Insulation Type (Heating/Cooling)
Remarks
General
[30°C(86°F), 85%]
High humidity
[30°C(86°F), 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 ~ 50.80 1/2~2 13 1/2 13 1/2
Gas pipe
6.35 1/4 13 1/2 19 3/4
9.52 ~ 25.40 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
50.80 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.
- When the pipe is installed in high humidity areas due to lack of a ventilation system.
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