Refrigerant line insulation is a condensation and safety control, not a generic plumbing choice. Always insulate the refrigerant lines and joints after the system's air-tightness test and vacuum drying, following the unit-specific manual.
Environmental screening
Source and boundary
Daikin's VRV Aurora installation manual gives 15 mm minimum at 30°C and 75–80% RH, and 20 mm minimum when ambient temperature is above 30°C and humidity is 80% RH or higher. This selector reports only those two published environmental bands.
Daikin VRV Aurora installation manual (PDF)
FAQ
Why does humidity change the insulation thickness?
High humidity raises the risk of surface condensation, so the cited installation guidance increases the minimum thickness.
Should liquid and gas refrigerant lines be insulated?
Follow the exact equipment manual. The cited Daikin guidance calls for insulating suction gas, high/low-pressure gas, liquid piping, and connections for the listed system.
Can I use this for every brand and refrigerant?
No. It is a transparent screen based on the cited Daikin guidance. The installed equipment manual and applicable code control.