
Installation guide
57
① The thickness of the thermal insulation material must be determined in the light of the pipe
sizes. Pipe size in. (mm) Thickness of insulation material
Pipe size in(mm)
Thickness of insulation
material
1/2 or more (12.5mm or more)
② It will be necessary to increase the values in the above table for top floors or where
conditions are hot and humid. (Refer to Installation manual "6-5 Pipe insulation" for more
detail)
③ Where a customer supplies his own specifications then these must be adhered to.
④ Where it is anticipated that the air conditioning unit will be operated at external air
temperatures of 10°C or less then thermal insulation will also be required for the liquid
pipes.
Series
• Suction, Discharge Gas piping, liquid piping must be insulated.
• Example of thermal insulation work.
3 piping section (between outdoor unit and MCU unit) 2 piping section (between MCU unit and indoor unit)
• If you think that the humidity around the cooling piping might exceed
86°F and RH80%, reinforce the insulation on the cooling piping (at least
13/16" thick). Condensation might form on the surface of the insulation.
2) Insulating the refrigerant pipe
(1) Insulating the refrigerant
• You must check if there is a gas leak before completing all the installation process.
• Use EPDM insulation which meets the following condition.
Dimension change route by
heat
Water absorption rate g/cm 0.005 or less
Moisture transpiration factor
Moisture transpiration grade
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