Leak test and insulation
Testing gas leak
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Use the nitrogen gas to test refrigerant gas leak of liquid and gas pipe
connection part .
For detailed information on the leak test, refer to the installation manual of an
outdoor unit .
Leak test part
Insulating the pipe
After carrying out the gas leak test, insulate the refrigerant pipe .
1 . Selecting an insulator of the refrigerant pipe
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Insulate both the liquid and gas pipe while considering the thickness of the insulator depending on each pipe size .
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Indoor temperature 30 °C and humidity below 85 % are the standard condition . If the insulator is used in high humidity
condition, use one grade thicker insulator by referring to the table below .
Pipe
Pipe size (mm)
Insulation type [Heating/Cooling(mm)]
Remarks
Standard [30 °C, 85 %]
High humidity [30 °C, over 85 %]
EPDM, NBR
Liquid pipe
6 .35 ~ 9 .52
9
9
Heat resistant
temperature is 120 °C
or more
12 .70 ~ 50 .80
13
13
Gas pipe
6 .35
13
19
9 .52 ~ 25 .40
19
25
28 .58 ~ 44 .45
32
50 .80
25
38
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When installing the insulator in places and conditions as below, use the same insulator that is used in high humidity
conditions .
<Geographic condition>
- High humidity places such as near shoreline, hot spring, lake or river, and ridge (when the part of the building is
covered by earth and sand .)
<Operation condition>
- Restaurant ceiling, sauna, swimming pool etc .
<Building construction condition>
- The ceiling which is frequently exposed to moisture, and where cooling is not provided (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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DVM SUPER_IM_05684A-00_EN.indd 11
2016-04-01 오전 9:00:53
