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Installation Procedure
Step 8 Performing the gas leak test
To identify potential gas leaks on the indoor unit, inspect the connection area of each refrigerant pipe using a leak
detector for R-410A.
Before creating a vacuum and adding refrigerant, pressurize the whole system with nitrogen using a cylinder with a
pressure reducer at a pressure above 4.1MPa (594.7 PSI) in order to detect leaks on the refrigerant fittings.
Made vacuum for 15 minutes and pressurizing system with nitrogen.
Insulator
Step 9 Insulating the refrigerant pipes
Once you have checked that there are no leaks in the system, you can insulate the piping and hose.
1 Select the insulation of the refrigerant pipe.
• Insulate the gas side and liquid side pipe, noting the insulation thickness that must differ according to the pipe size.
• Standard: Less than an indoor temperature of 86°F (30°C), with humidity at 85%. If installing in a high humidity
environment, use one grade thicker insulator by referring to the table below. If installing in an unfavourable
environment, use thicker one.
• The heat-resistance temperature of the insulator must be more than 248°F (120°C).
Outer diameter
Pipe
mm
6.35~9.52
Liquid pipe
12.7~50.80
6.35
9.52~25.4
Gas pipe
28.58~44.45
50.8
• When installing insulation in the places and conditions below, use the same insulation that is used for high humidity
conditions.
14
English
Liquid side
Gas side
Insulation Type (Cooling, Heating)
General
[86°F(30°C), 85%]
inch
mm
1/4~3/8
9
1/2~2
13
1/4
13
3/8~1
19
1 1/8~1 3/4
19
2
25
High humidity
[86°F(30°C), over 85%]
inch
mm
3/8
9
1/2
13
1/2
19
3/4
25
3/4
32
1
38
Remarks
inch
3/8
1/2
Heating resisting
3/4
temperature over
1
248°F(120°C)
1 1/4
1 1/2
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